@charset "UTF-8";
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes fadeInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}
@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}
@keyframes slideIn {
  to {
    opacity: 1;
    transform: translateX(0);
  }
}
@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}
@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes pulse {
  0%, 100% {
    opacity: 0.6;
    transform: translate(-50%, -50%) scale(1);
  }
  50% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.1);
  }
}
@keyframes bounce {
  0%, 20%, 53%, 80%, 100% {
    transform: translateY(0);
  }
  40%, 43% {
    transform: translateY(-10px);
  }
  70% {
    transform: translateY(-5px);
  }
  90% {
    transform: translateY(-2px);
  }
}
@keyframes blink {
  0%, 50% {
    opacity: 1;
  }
  51%, 100% {
    opacity: 0.3;
  }
}
@keyframes shimmer {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(100%);
  }
}
@keyframes progress-shimmer {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(100%);
  }
}
@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}
@keyframes moveRight {
  0% {
    transform: translateX(0);
    opacity: 1;
  }
  100% {
    transform: translateX(200px);
    opacity: 0;
  }
}
@keyframes moveLeft {
  0% {
    transform: translateX(200px);
    opacity: 0;
  }
  100% {
    transform: translateX(0);
    opacity: 1;
  }
}
@keyframes shake {
  0%, 100% {
    transform: translateX(0);
  }
  10%, 30%, 50%, 70%, 90% {
    transform: translateX(-2px);
  }
  20%, 40%, 60%, 80% {
    transform: translateX(2px);
  }
}
@keyframes scale {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}
@keyframes fadeInLog {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes feedbackPop {
  0% {
    transform: translate(-50%, -50%) scale(0);
    opacity: 0;
  }
  20% {
    transform: translate(-50%, -50%) scale(1.1);
    opacity: 1;
  }
  80% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
  }
  100% {
    transform: translate(-50%, -50%) scale(0.9);
    opacity: 0;
  }
}
@keyframes glow {
  0%, 100% {
    box-shadow: 0 0 5px rgba(76, 175, 80, 0.3);
  }
  50% {
    box-shadow: 0 0 20px rgba(76, 175, 80, 0.6);
  }
}
@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}
@keyframes typewriter {
  from {
    width: 0;
  }
  to {
    width: 100%;
  }
}
@keyframes cursorBlink {
  0%, 50% {
    opacity: 1;
  }
  51%, 100% {
    opacity: 0;
  }
}
@keyframes ripple {
  0% {
    transform: scale(0);
    opacity: 1;
  }
  100% {
    transform: scale(4);
    opacity: 0;
  }
}
@keyframes heartbeat {
  0%, 40%, 80%, 100% {
    transform: scale(1);
  }
  20%, 60% {
    transform: scale(1.15);
  }
}
@keyframes wobble {
  0%, 100% {
    transform: translateX(0);
  }
  15% {
    transform: translateX(-5px) rotate(-5deg);
  }
  30% {
    transform: translateX(4px) rotate(3deg);
  }
  45% {
    transform: translateX(-3px) rotate(-3deg);
  }
  60% {
    transform: translateX(2px) rotate(2deg);
  }
  75% {
    transform: translateX(-1px) rotate(-1deg);
  }
}
@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}
@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}
@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.8);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}
@keyframes glow {
  0% {
    box-shadow: 0 0 5px rgba(59, 130, 246, 0.5);
  }
  50% {
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.8), 0 0 30px rgba(59, 130, 246, 0.6);
  }
  100% {
    box-shadow: 0 0 5px rgba(59, 130, 246, 0.5);
  }
}
@keyframes shimmer {
  0% {
    background-position: -1000px 0;
  }
  100% {
    background-position: 1000px 0;
  }
}
@keyframes typewriter {
  from {
    width: 0;
  }
  to {
    width: 100%;
  }
}
@keyframes blink {
  0%, 50% {
    opacity: 1;
  }
  51%, 100% {
    opacity: 0;
  }
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", sans-serif;
  font-size: 1rem;
  line-height: 1.5;
  color: #000000;
  background-color: #f8f9fa;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.25;
  margin-bottom: 1rem;
  color: #000000;
}

h1 {
  font-size: 2.25rem;
}

h2 {
  font-size: 1.875rem;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

h5 {
  font-size: 1.125rem;
}

h6 {
  font-size: 1rem;
}

p {
  margin-bottom: 1rem;
  color: #000000;
  line-height: 1.625;
}

a {
  color: #4CAF50;
  text-decoration: none;
  transition: color 0.15s ease;
}
a:hover {
  color: #45a049;
  text-decoration: underline;
}

ul, ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.5rem;
  color: #000000;
}

blockquote {
  margin: 1.5rem 0;
  padding: 1.25rem;
  border-left: 4px solid #4CAF50;
  background: #f8f9fa;
  border-radius: 0.5rem;
  font-style: italic;
}
blockquote p {
  margin-bottom: 0;
}

code {
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
  background: #e9ecef;
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  color: #4CAF50;
}

pre {
  background: #2c3e50;
  color: #ecf0f1;
  padding: 1.25rem;
  border-radius: 0.5rem;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
  line-height: 1.5;
  white-space: pre-wrap;
  overflow-x: auto;
  border-left: 4px solid #4CAF50;
  margin: 1.5rem 0;
}
pre code {
  background: transparent;
  padding: 0;
  color: inherit;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}
@media (min-width: 992px) {
  .container {
    padding: 0 2rem;
  }
}

.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.text-primary {
  color: #000000 !important;
}

.text-secondary {
  color: #000000 !important;
}

.text-muted {
  color: #495057 !important;
}

.text-success {
  color: #28a745 !important;
}

.text-warning {
  color: #ffc107 !important;
}

.text-danger {
  color: #dc3545 !important;
}

.bg-primary {
  background-color: #ffffff !important;
}

.bg-secondary {
  background-color: #f8f9fa !important;
}

.bg-success {
  background-color: #d4edda !important;
}

.bg-warning {
  background-color: #fff3cd !important;
}

.bg-danger {
  background-color: #f8d7da !important;
}

.d-none {
  display: none !important;
}

.d-block {
  display: block !important;
}

.d-inline {
  display: inline !important;
}

.d-inline-block {
  display: inline-block !important;
}

.d-flex {
  display: flex !important;
}

.d-grid {
  display: grid !important;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.flex-column {
  display: flex;
  flex-direction: column;
}

.flex-wrap {
  display: flex;
  flex-wrap: wrap;
}

.m-0 {
  margin: 0 !important;
}

.m-1 {
  margin: 0.5rem !important;
}

.m-2 {
  margin: 1rem !important;
}

.m-3 {
  margin: 1.5rem !important;
}

.m-4 {
  margin: 2rem !important;
}

.p-0 {
  padding: 0 !important;
}

.p-1 {
  padding: 0.5rem !important;
}

.p-2 {
  padding: 1rem !important;
}

.p-3 {
  padding: 1.5rem !important;
}

.p-4 {
  padding: 2rem !important;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.btn-primary:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.btn-primary {
  background: linear-gradient(135deg, #4CAF50, #45a049);
  color: white;
}
.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, #45a049, #3d8b40);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
}
.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.btn-secondary:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.btn-secondary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.btn-secondary {
  background: #f8f9fa;
  color: #000000;
  border: 2px solid #e9ecef;
}
.btn-secondary:hover:not(:disabled) {
  background: #e9ecef;
  border-color: #4CAF50;
  transform: translateY(-2px);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.btn-outline:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.btn-outline:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.btn-outline {
  background: transparent;
  color: #4CAF50;
  border: 2px solid #4CAF50;
}
.btn-outline:hover:not(:disabled) {
  background: #4CAF50;
  color: white;
  transform: translateY(-2px);
}

.btn-danger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.btn-danger:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.btn-danger:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.btn-danger {
  background: #dc3545;
  color: white;
  border: 2px solid #dc3545;
}
.btn-danger:hover:not(:disabled) {
  background: rgb(209.4151898734, 36.2848101266, 52.8721518987);
  border-color: rgb(209.4151898734, 36.2848101266, 52.8721518987);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(220, 53, 69, 0.3);
}
.btn-danger:active:not(:disabled) {
  transform: translateY(0);
}

.btn-topic {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.btn-topic:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.btn-topic:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.btn-topic {
  background: linear-gradient(135deg, #4CAF50, #45a049);
  color: white;
}
.btn-topic:hover:not(:disabled) {
  background: linear-gradient(135deg, #45a049, #3d8b40);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
}
.btn-topic:active:not(:disabled) {
  transform: translateY(0);
}
.btn-topic {
  width: 100%;
  justify-content: center;
  gap: 0.75rem;
  font-size: 0.875rem;
  padding: 1rem 1.25rem;
}
.btn-topic i {
  transition: transform 0.15s ease;
}
.btn-topic:hover i {
  transform: translateX(3px);
}

input, select, textarea {
  padding: 1rem;
  border: 2px solid #e9ecef;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  transition: border-color 0.3s ease;
  background: #ffffff;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: #4CAF50;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
input::placeholder, select::placeholder, textarea::placeholder {
  color: #000000;
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: #e9ecef;
  border-radius: 0.25rem;
}

::-webkit-scrollbar-thumb {
  background: #ced4da;
  border-radius: 0.25rem;
}
::-webkit-scrollbar-thumb:hover {
  background: #000000;
}

::selection {
  background: rgba(76, 175, 80, 0.2);
  color: #000000;
}

::-moz-selection {
  background: rgba(76, 175, 80, 0.2);
  color: #000000;
}

:focus {
  outline: none;
}

:focus-visible {
  outline: 2px solid #4CAF50;
  outline-offset: 2px;
}

.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid #e9ecef;
  border-top: 3px solid #4CAF50;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

@media print {
  * {
    background: transparent !important;
    color: black !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }
  a, a:visited {
    text-decoration: underline;
  }
  pre, blockquote {
    border: 1px solid #999;
    page-break-inside: avoid;
  }
  thead {
    display: table-header-group;
  }
  tr, img {
    page-break-inside: avoid;
  }
  img {
    max-width: 100% !important;
  }
  p, h2, h3 {
    orphans: 3;
    widows: 3;
  }
  h2, h3 {
    page-break-after: avoid;
  }
}
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}
.header {
  background: linear-gradient(135deg, #4CAF50, #45a049);
  color: white;
  padding: 2rem 0;
  text-align: center;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  position: relative;
  overflow: hidden;
}
.header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" fill="none"><circle cx="20" cy="20" r="2" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="20" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="20" cy="80" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="80" r="2" fill="rgba(255,255,255,0.1)"/></svg>') repeat;
  opacity: 0.3;
  pointer-events: none;
}
.header .header-content {
  position: relative;
  z-index: 1;
}
.header .header-title {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: white;
}
.header .header-title i {
  font-size: 1.2em;
  opacity: 0.9;
}
@media (max-width: 768px) {
  .header .header-title {
    font-size: 1.875rem;
    flex-direction: column;
    gap: 0.75rem;
  }
}
.header .header-subtitle {
  font-size: 1.125rem;
  opacity: 0.9;
  font-weight: 400;
  margin: 0;
  color: white;
}

.main {
  padding: 3rem 0;
  min-height: calc(100vh - 200px);
}

.hero {
  text-align: center;
  margin-bottom: 3rem;
}
.hero .hero-title {
  font-size: 1.875rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, #4CAF50, #45a049);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
@media (max-width: 768px) {
  .hero .hero-title {
    font-size: 1.5rem;
  }
}
.hero .hero-description {
  font-size: 1.125rem;
  max-width: 800px;
  margin: 0 auto;
  color: #000000;
  line-height: 1.625;
}
@media (max-width: 768px) {
  .hero .hero-description {
    font-size: 1rem;
  }
}

.units-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.unit-card {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
  cursor: pointer;
}
.unit-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(135deg, #4CAF50, #45a049);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}
.unit-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 25px rgba(0, 0, 0, 0.1);
  background: #ffffff;
  border-color: #4CAF50;
}
.unit-card:hover::before {
  transform: scaleX(1);
}
.unit-card:hover .unit-icon i {
  transform: scale(1.1);
  background: linear-gradient(135deg, #45a049, #3d8b40);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.unit-card .unit-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}
@media (max-width: 576px) {
  .unit-card .unit-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
}
.unit-card .unit-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  background: rgba(76, 175, 80, 0.1);
  border-radius: 0.9375rem;
  margin-right: 1rem;
  flex-shrink: 0;
}
.unit-card .unit-icon i {
  font-size: 1.5rem;
  background: linear-gradient(135deg, #4CAF50, #45a049);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  transition: all 0.3s ease;
}
@media (max-width: 576px) {
  .unit-card .unit-icon {
    margin-right: 0;
  }
}
.unit-card .unit-info {
  flex-grow: 1;
}
.unit-card .unit-info .unit-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: #000000;
}
.unit-card .unit-info .unit-duration {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  color: #000000;
  font-size: 0.875rem;
  font-weight: 500;
}
.unit-card .unit-info .unit-duration::before {
  content: "\f017";
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
}
.unit-card .unit-description {
  margin-bottom: 1.5rem;
}
.unit-card .unit-description p {
  color: #000000;
  line-height: 1.625;
  margin: 0;
}
.unit-card .unit-topics {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding: 1rem;
  background: #f8f9fa;
  border-radius: 0.625rem;
}
@media (max-width: 576px) {
  .unit-card .unit-topics {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
}
.unit-card .unit-topics .topic-count {
  font-weight: 600;
  color: #4CAF50;
  font-size: 0.875rem;
}
.unit-card .unit-topics .topics-preview {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.unit-card .unit-topics .topics-preview span {
  padding: 0.25rem 0.75rem;
  background: white;
  border-radius: 0.9375rem;
  font-size: 0.75rem;
  color: #000000;
  border: 1px solid #e9ecef;
  white-space: nowrap;
}
.unit-card .unit-footer .btn-primary {
  width: 100%;
  justify-content: center;
  gap: 0.75rem;
  font-size: 1rem;
  padding: 1.25rem 1.5rem;
}
.unit-card .unit-footer .btn-primary i {
  transition: transform 0.15s ease;
}
.unit-card .unit-footer .btn-primary:hover i {
  transform: translateX(3px);
}

.course-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.stat-card {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  padding: 1.5rem;
  text-align: center;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
}
.stat-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 25px rgba(0, 0, 0, 0.1);
  background: white;
  border-color: #4CAF50;
}
.stat-card:hover .stat-icon i {
  transform: scale(1.1);
  color: #45a049;
}
.stat-card .stat-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  background: rgba(76, 175, 80, 0.1);
  border-radius: 50%;
}
.stat-card .stat-icon i {
  font-size: 1.25rem;
  color: #4CAF50;
  transition: all 0.3s ease;
}
.stat-card .stat-info h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: #000000;
  margin-bottom: 0.25rem;
}
.stat-card .stat-info p {
  font-size: 0.875rem;
  color: #000000;
  margin: 0;
  font-weight: 500;
}

.footer {
  background: #2c3e50;
  color: #ecf0f1;
  text-align: center;
  padding: 2rem 0;
  margin-top: auto;
}
.footer p {
  margin: 0;
  opacity: 0.8;
  font-size: 0.875rem;
}

.progress-indicator {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: rgba(76, 175, 80, 0.1);
  z-index: 1030;
}
.progress-indicator .progress-bar {
  height: 100%;
  background: linear-gradient(135deg, #4CAF50, #45a049);
  width: 0%;
  transition: width 0.3s ease;
}

@media (max-width: 992px) {
  .units-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
  }
  .course-stats {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 768px) {
  .main {
    padding: 2rem 0;
  }
  .hero {
    margin-bottom: 2rem;
  }
  .units-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .course-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }
}
@media (max-width: 576px) {
  .header {
    padding: 1.5rem 0;
  }
  .header .header-title {
    font-size: 1.5rem;
  }
  .header .header-subtitle {
    font-size: 1rem;
  }
  .course-stats {
    grid-template-columns: 1fr;
  }
  .stat-card {
    flex-direction: row;
    text-align: left;
  }
}
.breadcrumb {
  background: #f8f9fa;
  padding: 1rem 0;
  border-bottom: 1px solid #e9ecef;
}
.breadcrumb .container {
  display: flex;
  align-items: center;
  justify-content: center;
  justify-content: flex-start;
  gap: 0.75rem;
}
.breadcrumb a, .breadcrumb span {
  color: #000000;
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
}
.breadcrumb a:hover, .breadcrumb span:hover {
  color: #4CAF50;
}
.breadcrumb a i, .breadcrumb span i {
  margin-right: 0.5rem;
}
.breadcrumb .separator {
  color: #495057;
  font-weight: normal;
}
.breadcrumb .current {
  color: #000000;
  font-weight: 600;
}

.content-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 2.5rem;
  align-items: start;
}
@media (max-width: 992px) {
  .content-layout {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

.content-main {
  min-width: 0;
}

.table-of-contents {
  position: sticky;
  top: 1.5rem;
  background: white;
  border-radius: 0.625rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  padding: 1.5rem;
  border: 1px solid #e9ecef;
}
@media (max-width: 992px) {
  .table-of-contents {
    position: static;
    order: -1;
  }
}
.table-of-contents h3 {
  margin: 0 0 1.25rem 0;
  color: #000000;
  font-size: 1.125rem;
  font-weight: 700;
  border-bottom: 2px solid #4CAF50;
  padding-bottom: 0.75rem;
}
.table-of-contents ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.table-of-contents li {
  margin-bottom: 0.5rem;
}
.table-of-contents a {
  display: block;
  padding: 0.5rem 0.75rem;
  color: #000000;
  text-decoration: none;
  border-radius: 0.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.3s ease;
}
.table-of-contents a:hover {
  background: rgba(76, 175, 80, 0.1);
  color: #4CAF50;
  transform: translateX(4px);
}
.table-of-contents a.active {
  background: rgba(76, 175, 80, 0.1);
  color: #4CAF50;
  font-weight: 600;
}

.unit-page {
  min-height: 100vh;
  background: #f8f9fa;
}
.unit-page .unit-header {
  background: linear-gradient(135deg, #4CAF50, #45a049);
  color: white;
  padding: 2.5rem 0;
  position: relative;
  overflow: hidden;
}
.unit-page .unit-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" fill="none"><circle cx="20" cy="20" r="2" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="20" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="20" cy="80" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="80" r="2" fill="rgba(255,255,255,0.1)"/></svg>') repeat;
  opacity: 0.3;
  pointer-events: none;
}
.unit-page .unit-header .header-content {
  position: relative;
  z-index: 1;
}
.unit-page .unit-header {
  text-align: center;
}
.unit-page .unit-header .unit-header-content {
  position: relative;
  z-index: 1;
}
.unit-page .unit-header .unit-title {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: white;
}
@media (max-width: 768px) {
  .unit-page .unit-header .unit-title {
    font-size: 1.5rem;
  }
}
.unit-page .unit-header .unit-title i {
  font-size: 1.2em;
  opacity: 0.9;
}
@media (max-width: 768px) {
  .unit-page .unit-header .unit-title {
    font-size: 1.5rem;
    flex-direction: column;
    gap: 0.75rem;
  }
}
.unit-page .unit-header .unit-description {
  font-size: 1rem;
  opacity: 0.8;
  color: white;
  line-height: 1.625;
  max-width: 800px;
  margin: 0 auto 1.5rem;
}
.unit-page .unit-header .unit-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
}
@media (max-width: 576px) {
  .unit-page .unit-header .unit-stats {
    flex-direction: column;
    gap: 1rem;
  }
}
.unit-page .unit-header .unit-stats .stat-item {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  color: white;
  font-weight: 500;
}
.unit-page .unit-header .unit-stats .stat-item i {
  font-size: 1.125rem;
  opacity: 0.8;
}
.unit-page .unit-content {
  padding: 3rem 0;
}

.breadcrumb {
  background: white;
  padding: 1rem 0;
  border-bottom: 1px solid #e9ecef;
}
.breadcrumb .breadcrumb-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
@media (max-width: 576px) {
  .breadcrumb .breadcrumb-content {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
}
.breadcrumb .breadcrumb-content .breadcrumb-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}
.breadcrumb .breadcrumb-content .breadcrumb-links a {
  color: #000000;
  font-size: 0.875rem;
  transition: color 0.15s ease;
}
.breadcrumb .breadcrumb-content .breadcrumb-links a:hover {
  color: #4CAF50;
}
.breadcrumb .breadcrumb-content .breadcrumb-links .separator {
  color: #495057;
  font-size: 0.75rem;
}
.breadcrumb .breadcrumb-content .breadcrumb-links .current {
  color: #4CAF50;
  font-weight: 500;
}
.breadcrumb .breadcrumb-content .unit-progress {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}
.breadcrumb .breadcrumb-content .unit-progress .progress-info {
  font-size: 0.875rem;
  color: #000000;
}
.breadcrumb .breadcrumb-content .unit-progress .progress-bar {
  width: 100px;
  height: 6px;
  background: #e9ecef;
  border-radius: 50%;
  overflow: hidden;
}
.breadcrumb .breadcrumb-content .unit-progress .progress-bar .progress-fill {
  height: 100%;
  background: linear-gradient(135deg, #4CAF50, #45a049);
  border-radius: 50%;
  transition: width 0.5s ease;
}

.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.topic-card {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
  cursor: pointer;
  display: flex;
  flex-direction: column;
}
.topic-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(135deg, #4CAF50, #45a049);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}
.topic-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 25px rgba(0, 0, 0, 0.1);
  background: #ffffff;
  border-color: #4CAF50;
}
.topic-card:hover::before {
  transform: scaleX(1);
}
.topic-card:hover .topic-icon {
  transform: scale(1.05);
  background: rgba(76, 175, 80, 0.15);
}
.topic-card:hover .topic-image {
  transform: scale(1.05);
}
.topic-card.completed {
  border-color: #28a745;
}
.topic-card.completed::before {
  background: #28a745;
  transform: scaleX(1);
}
.topic-card.completed .completion-badge {
  opacity: 1;
}
.topic-card .topic-header {
  padding: 1.25rem 1.25rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  align-items: flex-start;
  border-bottom: 1px solid #e9ecef;
}
.topic-card .topic-header .topic-number {
  background: linear-gradient(135deg, #4CAF50, #45a049);
  color: white;
  padding: 0.5rem 0.75rem;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  min-width: 50px;
  text-align: center;
}
.topic-card .topic-header .topic-title {
  flex: 1;
  margin: 0 1rem;
  font-size: 1.125rem;
  font-weight: 600;
  color: #000000;
  line-height: 1.25;
}
.topic-card .topic-header .topic-status {
  color: #000000;
  font-size: 1.125rem;
}
.topic-card .topic-header .topic-status i {
  transition: color 0.3s ease;
}
.topic-card .topic-header .topic-status.completed i {
  color: #28a745;
}
.topic-card .topic-header .topic-status.in-progress i {
  color: #ffc107;
}
.topic-card .topic-image {
  width: 100%;
  height: 160px;
  background: linear-gradient(135deg, rgba(76, 175, 80, 0.1), rgba(33, 150, 243, 0.1));
  border-radius: 0.625rem;
  margin-bottom: 1.25rem;
  position: relative;
  overflow: hidden;
  transition: transform 0.3s ease;
}
.topic-card .topic-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.topic-card .topic-image .topic-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  background: rgba(255, 255, 255, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}
.topic-card .topic-image .topic-icon i {
  font-size: 1.5rem;
  background: linear-gradient(135deg, #4CAF50, #45a049);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.topic-card .topic-content {
  padding: 1.25rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.topic-card .topic-content .topic-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: #000000;
  word-wrap: break-word;
}
.topic-card .topic-content .topic-description {
  color: #000000;
  line-height: 1.625;
  margin-bottom: 1.25rem;
  font-size: 0.875rem;
  word-wrap: break-word;
  flex-grow: 1;
}
.topic-card .topic-content .subtopics {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}
.topic-card .topic-content .subtopics .subtopic {
  padding: 0.25rem 0.5rem;
  background: rgba(76, 175, 80, 0.1);
  color: #4CAF50;
  border-radius: 0.9375rem;
  font-size: 0.75rem;
  font-weight: 500;
  border: 1px solid rgba(76, 175, 80, 0.2);
  transition: all 0.15s ease;
}
.topic-card .topic-content .subtopics .subtopic:hover {
  background: rgba(76, 175, 80, 0.15);
  transform: translateY(-1px);
}
.topic-card .topic-content .topic-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}
.topic-card .topic-content .topic-meta .duration, .topic-card .topic-content .topic-meta .difficulty {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  color: #000000;
  font-size: 0.75rem;
}
.topic-card .topic-content .topic-meta .duration i, .topic-card .topic-content .topic-meta .difficulty i {
  color: #4CAF50;
}
.topic-card .topic-content .topic-meta .topic-duration {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  color: #000000;
  font-size: 0.75rem;
}
.topic-card .topic-content .topic-meta .topic-duration i {
  color: #4CAF50;
}
.topic-card .topic-content .topic-meta .topic-difficulty {
  padding: 0.25rem 0.75rem;
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 500;
}
.topic-card .topic-content .topic-meta .topic-difficulty.beginner {
  background: rgba(40, 167, 69, 0.1);
  color: #28a745;
}
.topic-card .topic-content .topic-meta .topic-difficulty.intermediate {
  background: rgba(255, 193, 7, 0.1);
  color: rgb(209.6, 157.2, 0);
}
.topic-card .topic-content .topic-meta .topic-difficulty.advanced {
  background: rgba(220, 53, 69, 0.1);
  color: #dc3545;
}
.topic-card .topic-content .topic-footer .btn-primary {
  width: 100%;
  justify-content: center;
  gap: 0.75rem;
}
.topic-card .topic-content .topic-footer .btn-primary i {
  transition: transform 0.15s ease;
}
.topic-card .topic-content .topic-footer .btn-primary:hover i {
  transform: translateX(3px);
}
.topic-card .completion-badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 30px;
  height: 30px;
  background: #28a745;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}
.topic-card .completion-badge i {
  color: white;
  font-size: 0.875rem;
}

.unit-completion {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  text-align: center;
  background: #d4edda;
  border: 1px solid rgba(40, 167, 69, 0.3);
}
.unit-completion .completion-icon {
  width: 80px;
  height: 80px;
  background: #28a745;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
}
.unit-completion .completion-icon i {
  font-size: 1.875rem;
  color: white;
}
.unit-completion h3 {
  color: #28a745;
  margin-bottom: 1rem;
}
.unit-completion .completion-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  margin: 1.5rem 0;
}
@media (max-width: 576px) {
  .unit-completion .completion-stats {
    flex-direction: column;
    gap: 1rem;
  }
}
.unit-completion .completion-stats .stat-item {
  text-align: center;
}
.unit-completion .completion-stats .stat-item .stat-number {
  font-size: 1.5rem;
  font-weight: 700;
  color: #28a745;
  margin-bottom: 0.25rem;
}
.unit-completion .completion-stats .stat-item .stat-label {
  font-size: 0.875rem;
  color: #000000;
}
.unit-completion .next-unit-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.unit-completion .next-unit-btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.unit-completion .next-unit-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.unit-completion .next-unit-btn {
  background: linear-gradient(135deg, #4CAF50, #45a049);
  color: white;
}
.unit-completion .next-unit-btn:hover:not(:disabled) {
  background: linear-gradient(135deg, #45a049, #3d8b40);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
}
.unit-completion .next-unit-btn:active:not(:disabled) {
  transform: translateY(0);
}
.unit-completion .next-unit-btn {
  font-size: 1.125rem;
  padding: 1.25rem 2.5rem;
  gap: 0.75rem;
}
.unit-completion .next-unit-btn i {
  transition: transform 0.15s ease;
}
.unit-completion .next-unit-btn:hover i {
  transform: translateX(3px);
}

@media (max-width: 992px) {
  .topics-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
  }
}
@media (max-width: 768px) {
  .unit-page .unit-header {
    padding: 2rem 0;
  }
  .unit-page .unit-header .unit-title {
    font-size: 1.5rem;
  }
  .unit-page .unit-header .unit-description {
    font-size: 1rem;
  }
  .unit-page .unit-content {
    padding: 2rem 0;
  }
  .topics-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}
@media (max-width: 576px) {
  .topic-card .topic-image {
    height: 120px;
  }
  .topic-card .topic-image .topic-icon {
    width: 50px;
    height: 50px;
  }
  .topic-card .topic-image .topic-icon i {
    font-size: 1.25rem;
  }
  .unit-completion .completion-icon {
    width: 60px;
    height: 60px;
  }
  .unit-completion .completion-icon i {
    font-size: 1.5rem;
  }
}
.concept-map {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-top: 1.25rem;
}
@media (max-width: 768px) {
  .concept-map {
    gap: 1rem;
  }
}

.concept-node {
  background: #2196F3;
  color: white;
  padding: 1rem 1.25rem;
  border-radius: 50%;
  font-weight: 600;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  position: relative;
  transition: all 0.3s ease;
  font-size: 1rem;
}
.concept-node:hover {
  transform: scale(1.02);
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}
.concept-node::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 100%;
  width: 1.25rem;
  height: 2px;
  background: #2196F3;
  transform: translateY(-50%);
}
@media (max-width: 768px) {
  .concept-node::after {
    display: none;
  }
}
.concept-node.main {
  background: #28a745;
  font-size: 1.125rem;
}
.concept-node.main::after {
  background: #28a745;
}

.topic-page {
  min-height: 100vh;
  background: #f8f9fa;
}
.topic-page .topic-header {
  background: linear-gradient(135deg, #4CAF50, #45a049);
  color: white;
  padding: 2.5rem 0;
  position: relative;
  overflow: hidden;
}
.topic-page .topic-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" fill="none"><circle cx="20" cy="20" r="2" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="20" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="20" cy="80" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="80" r="2" fill="rgba(255,255,255,0.1)"/></svg>') repeat;
  opacity: 0.3;
  pointer-events: none;
}
.topic-page .topic-header .header-content {
  position: relative;
  z-index: 1;
}
.topic-page .topic-header {
  color: white;
  padding: 2.5rem 0;
}
.topic-page .topic-header .topic-header-content {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  text-align: left;
}
@media (max-width: 768px) {
  .topic-page .topic-header .topic-header-content {
    flex-direction: column;
    text-align: center;
  }
}
.topic-page .topic-header .topic-icon-large {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100px;
  height: 100px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  border: 3px solid rgba(255, 255, 255, 0.2);
  flex-shrink: 0;
}
.topic-page .topic-header .topic-icon-large i {
  font-size: 2.25rem;
  color: white;
}
@media (max-width: 768px) {
  .topic-page .topic-header .topic-icon-large {
    width: 80px;
    height: 80px;
  }
  .topic-page .topic-header .topic-icon-large i {
    font-size: 1.875rem;
  }
}
.topic-page .topic-header .topic-header-text {
  flex: 1;
}
.topic-page .topic-header .topic-title {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: white;
}
@media (max-width: 768px) {
  .topic-page .topic-header .topic-title {
    font-size: 1.5rem;
  }
}
.topic-page .topic-header .topic-subtitle {
  font-size: 1.125rem;
  opacity: 0.9;
  margin-bottom: 1rem;
  color: white;
}
.topic-page .topic-header .topic-description {
  font-size: 1rem;
  opacity: 0.8;
  color: white;
  line-height: 1.625;
}
.topic-page .topic-header .topic-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 3rem;
}
@media (max-width: 576px) {
  .topic-page .topic-header .topic-meta {
    flex-direction: column;
    gap: 1rem;
  }
}
.topic-page .topic-header .topic-meta .meta-item {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  color: white;
  font-weight: 500;
}
.topic-page .topic-header .topic-meta .meta-item i {
  font-size: 1.125rem;
  opacity: 0.8;
}

.progress-container {
  position: sticky;
  top: 0;
  background: white;
  padding: 1rem 0;
  border-bottom: 1px solid #e9ecef;
  z-index: 1020;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}
.progress-container .progress-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
@media (max-width: 576px) {
  .progress-container .progress-content {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
}
.progress-container .progress-content .progress-info {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}
.progress-container .progress-content .progress-info .back-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.progress-container .progress-content .progress-info .back-button:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.progress-container .progress-content .progress-info .back-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.progress-container .progress-content .progress-info .back-button {
  background: #f8f9fa;
  color: #000000;
  border: 2px solid #e9ecef;
}
.progress-container .progress-content .progress-info .back-button:hover:not(:disabled) {
  background: #e9ecef;
  border-color: #4CAF50;
  transform: translateY(-2px);
}
.progress-container .progress-content .progress-info .back-button {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  gap: 0.5rem;
}
.progress-container .progress-content .progress-info .back-button i {
  transition: transform 0.15s ease;
}
.progress-container .progress-content .progress-info .back-button:hover i {
  transform: translateX(-3px);
}
.progress-container .progress-content .progress-info .topic-progress-text {
  font-size: 0.875rem;
  color: #000000;
}
.progress-container .progress-content .progress-bar {
  width: 200px;
  height: 6px;
  background: #e9ecef;
  border-radius: 50%;
  overflow: hidden;
}
@media (max-width: 576px) {
  .progress-container .progress-content .progress-bar {
    width: 100%;
  }
}
.progress-container .progress-content .progress-bar #topic-progress {
  height: 100%;
  background: linear-gradient(135deg, #4CAF50, #45a049);
  border-radius: 50%;
  width: 0%;
  transition: width 0.5s ease;
}

.content-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 2.5rem;
  padding: 2.5rem 0;
  align-items: start;
}
@media (max-width: 992px) {
  .content-layout {
    grid-template-columns: 250px 1fr;
    gap: 2rem;
  }
}
@media (max-width: 768px) {
  .content-layout {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding: 2rem 0;
  }
}

.topic-content {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 2.5rem;
  padding: 2.5rem 0;
}
@media (max-width: 992px) {
  .topic-content {
    grid-template-columns: 200px 1fr;
    gap: 2rem;
  }
}
@media (max-width: 768px) {
  .topic-content {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding: 2rem 0;
  }
}

.table-of-contents {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  height: fit-content;
  position: sticky;
  top: 20px;
  padding: 1.5rem;
}
@media (max-width: 768px) {
  .table-of-contents {
    position: static;
    margin-bottom: 2rem;
  }
}
.table-of-contents h3, .table-of-contents h4 {
  font-size: 1.125rem;
  margin-bottom: 1.25rem;
  color: #000000;
  border-bottom: 2px solid #4CAF50;
  padding-bottom: 0.75rem;
}
.table-of-contents ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.table-of-contents ul li {
  margin-bottom: 0.5rem;
}
.table-of-contents ul li .toc-dropdown-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.75rem 1rem;
  background: linear-gradient(135deg, rgba(76, 175, 80, 0.05), rgba(76, 175, 80, 0.02));
  border: 1px solid rgba(76, 175, 80, 0.15);
  border-radius: 0.5rem;
  color: #000000;
  font-weight: 700;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: all 0.3s ease;
  text-align: left;
  position: relative;
  overflow: hidden;
}
.table-of-contents ul li .toc-dropdown-toggle::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(76, 175, 80, 0.1), transparent);
  transition: left 0.5s ease-in-out;
}
.table-of-contents ul li .toc-dropdown-toggle:hover {
  background: linear-gradient(135deg, rgba(76, 175, 80, 0.1), rgba(76, 175, 80, 0.05));
  border-color: rgba(76, 175, 80, 0.25);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(76, 175, 80, 0.15);
}
.table-of-contents ul li .toc-dropdown-toggle:hover::before {
  left: 100%;
}
.table-of-contents ul li .toc-dropdown-toggle:focus {
  outline: 2px solid #4CAF50;
  outline-offset: 2px;
  background: linear-gradient(135deg, rgba(76, 175, 80, 0.1), rgba(76, 175, 80, 0.05));
}
.table-of-contents ul li .toc-dropdown-toggle:active {
  transform: translateY(0);
  box-shadow: 0 2px 6px rgba(76, 175, 80, 0.1);
}
.table-of-contents ul li .toc-dropdown-toggle span {
  flex: 1;
  position: relative;
  z-index: 1;
}
.table-of-contents ul li .toc-dropdown-toggle .toc-chevron {
  margin-left: 0.5rem;
  transition: transform 0.3s ease, color 0.3s ease;
  color: #4CAF50;
  font-size: 0.75rem;
  position: relative;
  z-index: 1;
}
.table-of-contents ul li .toc-dropdown-toggle[aria-expanded=true] {
  background: linear-gradient(135deg, rgba(76, 175, 80, 0.15), rgba(76, 175, 80, 0.08));
  border-color: rgba(76, 175, 80, 0.35);
  box-shadow: 0 2px 8px rgba(76, 175, 80, 0.2);
}
.table-of-contents ul li .toc-dropdown-toggle[aria-expanded=true] .toc-chevron {
  color: rgb(64.6, 148.75, 68);
}
.table-of-contents ul li .toc-dropdown-toggle[aria-expanded=true] .toc-chevron {
  color: rgb(64.6, 148.75, 68);
}
.table-of-contents ul li .toc-dropdown-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s ease-in-out, margin-top 0.3s ease-in-out, transform 0.3s ease-in-out;
  opacity: 0;
  margin-left: 1rem;
  margin-top: 0;
  transform: translateY(-5px);
  border-left: 2px solid rgba(76, 175, 80, 0.2);
  background: rgba(236, 240, 241, 0.02);
  border-radius: 0 0.25rem 0.25rem 0;
}
.table-of-contents ul li .toc-dropdown-content.expanded {
  max-height: 500px;
  opacity: 1;
  margin-top: 0.5rem;
  transform: translateY(0);
  padding-top: 0.25rem;
  padding-bottom: 0.25rem;
}
.table-of-contents ul li .toc-dropdown-content li {
  margin-bottom: 0.25rem;
  position: relative;
}
.table-of-contents ul li .toc-dropdown-content li::before {
  content: "→";
  position: absolute;
  left: -0.75rem;
  color: #4CAF50;
  font-size: 0.75rem;
  transition: transform 0.3s ease;
  opacity: 0.7;
}
.table-of-contents ul li .toc-dropdown-content li:hover::before {
  transform: translateX(2px);
  opacity: 1;
}
.table-of-contents ul li .toc-dropdown-content li a {
  display: block;
  padding: 0.5rem 0.75rem;
  color: #000000;
  border-radius: 0.25rem;
  transition: all 0.3s ease;
  font-size: 0.75rem;
  font-weight: 500;
  border-left: 2px solid transparent;
  position: relative;
  overflow: hidden;
}
.table-of-contents ul li .toc-dropdown-content li a::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(76, 175, 80, 0.1), transparent);
  transition: left 0.5s ease-in-out;
}
.table-of-contents ul li .toc-dropdown-content li a:hover, .table-of-contents ul li .toc-dropdown-content li a.active {
  background: rgba(76, 175, 80, 0.08);
  color: #4CAF50;
  border-left-color: #4CAF50;
  transform: translateX(3px);
  text-decoration: none;
  box-shadow: 0 2px 8px rgba(76, 175, 80, 0.1);
}
.table-of-contents ul li .toc-dropdown-content li a:hover::before, .table-of-contents ul li .toc-dropdown-content li a.active::before {
  left: 100%;
}
.table-of-contents ul li .toc-dropdown-content li a:focus {
  outline: 1px solid #4CAF50;
  outline-offset: 1px;
  background: rgba(76, 175, 80, 0.05);
}
.table-of-contents ul li .toc-dropdown-content li a.active {
  background: rgba(76, 175, 80, 0.15);
  font-weight: 600;
}
.table-of-contents ul li > a {
  display: block;
  padding: 0.75rem 1rem;
  color: #000000;
  border-radius: 0.5rem;
  transition: all 0.3s ease;
  font-size: 0.875rem;
  font-weight: 500;
}
.table-of-contents ul li > a:hover, .table-of-contents ul li > a.active {
  background: rgba(76, 175, 80, 0.1);
  color: #4CAF50;
  transform: translateX(5px);
  text-decoration: none;
}
.table-of-contents ul li > a.active {
  background: #4CAF50;
  color: white;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.main-content {
  background: white;
  border-radius: 0.9375rem;
  padding: 2.5rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}
@media (max-width: 768px) {
  .main-content {
    padding: 2rem;
  }
}
@media (max-width: 576px) {
  .main-content {
    padding: 1.5rem;
  }
}

.content-section {
  margin-bottom: 3rem;
  opacity: 0;
  transform: translateY(30px);
  animation: slideInUp 0.3s ease forwards;
}
.content-section:first-of-type {
  opacity: 1;
  transform: translateY(0);
}
.content-section h2 {
  font-size: 1.5rem;
  color: #000000;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid #e9ecef;
  position: relative;
}
.content-section h2::before {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 50px;
  height: 2px;
  background: linear-gradient(135deg, #4CAF50, #45a049);
}
.content-section h3 {
  font-size: 1.25rem;
  color: #000000;
  margin: 2rem 0 1.25rem 0;
}
.content-section h4 {
  font-size: 1.125rem;
  color: #000000;
  margin: 1.5rem 0 1rem 0;
}
.content-section p {
  margin-bottom: 1.25rem;
  line-height: 1.625;
}
.content-section ul, .content-section ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}
.content-section ul li, .content-section ol li {
  margin-bottom: 0.75rem;
  line-height: 1.625;
}
.content-section.animate-in {
  animation: slideInUp 0.3s ease forwards;
}

.topic-grid {
  display: grid;
  gap: 1.5rem;
  margin: 2rem 0;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}
@media (max-width: 768px) {
  .topic-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  }
}
@media (max-width: 576px) {
  .topic-grid {
    grid-template-columns: 1fr;
  }
}
.topic-grid.three-column {
  grid-template-columns: repeat(3, 1fr);
}
@media (max-width: 992px) {
  .topic-grid.three-column {
    grid-template-columns: repeat(3, 1fr);
  }
}
@media (max-width: 768px) {
  .topic-grid.three-column {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 576px) {
  .topic-grid.three-column {
    grid-template-columns: 1fr;
  }
}
.topic-grid.two-column {
  grid-template-columns: repeat(2, 1fr);
}
@media (max-width: 768px) {
  .topic-grid.two-column {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 576px) {
  .topic-grid.two-column {
    grid-template-columns: 1fr;
  }
}
.topic-grid.four-column {
  grid-template-columns: repeat(4, 1fr);
}
@media (max-width: 992px) {
  .topic-grid.four-column {
    grid-template-columns: repeat(4, 1fr);
  }
}
@media (max-width: 768px) {
  .topic-grid.four-column {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 576px) {
  .topic-grid.four-column {
    grid-template-columns: 1fr;
  }
}

.selector-category {
  margin-bottom: 2.5rem;
}
.selector-category:last-child {
  margin-bottom: 2rem;
}
.selector-category .category-title {
  font-size: 1.25rem;
  color: #000000;
  margin: 2rem 0 1.25rem 0;
  margin-bottom: 0.75rem;
  color: #4CAF50;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.selector-category .category-title i {
  color: #4CAF50;
  font-size: 1.125rem;
}
.selector-category .category-description {
  color: #000000;
  font-size: 1rem;
  margin-bottom: 1.5rem;
  font-style: italic;
}
.selector-category .topic-grid {
  margin-top: 1.25rem;
}

.interactive-element {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  margin: 2rem 0;
  background: linear-gradient(135deg, #f8f9fa, rgba(255, 255, 255, 0.9));
  border: 2px solid #e9ecef;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  position: relative;
  overflow: hidden;
  transition: all 0.3s ease;
}
.interactive-element::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(135deg, #4CAF50, #45a049);
  opacity: 0.8;
}
.interactive-element:hover {
  transform: translateY(-3px);
  box-shadow: 0 20px 25px rgba(0, 0, 0, 0.1);
  border-color: rgba(76, 175, 80, 0.3);
}
.interactive-element h3 {
  background: rgba(76, 175, 80, 0.05);
  margin: 0 0 1.5rem 0;
  padding: 1.25rem 1.5rem;
  border-radius: 0.625rem;
  border: 1px solid rgba(76, 175, 80, 0.1);
  font-size: 1.25rem;
  font-weight: 700;
  color: #000000;
}
.interactive-element h3 i {
  color: #4CAF50;
  margin-right: 1rem;
  font-size: 1.125rem;
  animation: pulse 2s infinite;
}
.interactive-element .element-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid #e9ecef;
}
.interactive-element .element-header h4 {
  margin: 0;
  color: #000000;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}
.interactive-element .element-header h4 i {
  color: #4CAF50;
}
.interactive-element .element-header .element-badge {
  padding: 0.25rem 0.75rem;
  background: rgba(76, 175, 80, 0.1);
  color: #4CAF50;
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 600;
}
.interactive-element .element-content .element-description {
  margin-bottom: 1.5rem;
  color: #000000;
  font-style: italic;
}

.interactive-demo {
  margin: 1.25rem 0;
}
.interactive-demo .btn-primary {
  margin-bottom: 1rem;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}
@media (max-width: 576px) {
  .form-grid {
    grid-template-columns: 1fr;
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.form-group label {
  font-weight: 500;
  color: #000000;
  font-size: 0.875rem;
}
.form-group input, .form-group select {
  padding: 1rem;
  border: 2px solid #e9ecef;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  transition: border-color 0.3s ease;
  background: #ffffff;
}
.form-group input:focus, .form-group select:focus {
  outline: none;
  border-color: #4CAF50;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.form-group input::placeholder, .form-group select::placeholder {
  color: #000000;
}
.form-group input, .form-group select {
  width: 100%;
}

.code-editor-textarea {
  padding: 1rem;
  border: 2px solid #e9ecef;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  transition: border-color 0.3s ease;
  background: #ffffff;
}
.code-editor-textarea:focus {
  outline: none;
  border-color: #4CAF50;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.code-editor-textarea::placeholder {
  color: #000000;
}
.code-editor-textarea {
  width: 100%;
  min-height: 120px;
  resize: vertical;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
  line-height: 1.5;
}

.align-self-start {
  align-self: start;
}

.align-self-end {
  align-self: end;
}

.align-self-center {
  align-self: center;
}

.demo-output {
  background: #e9ecef;
  border: 1px solid #e9ecef;
  border-radius: 0.5rem;
  padding: 1rem;
  margin-top: 1rem;
  animation: fadeIn 0.3s ease forwards;
}
.demo-output h4 {
  margin-top: 0;
  margin-bottom: 1rem;
  color: #4CAF50;
  font-weight: 600;
}
.demo-output ul {
  margin: 0;
  padding-left: 1.25rem;
}
.demo-output ul li {
  margin-bottom: 0.5rem;
  line-height: 1.5;
}
.demo-output ul li strong {
  color: #000000;
  font-weight: 600;
}
.demo-output pre {
  background: #2c3e50;
  color: #ecf0f1;
  padding: 1rem;
  border-radius: 0.25rem;
  overflow-x: auto;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
  line-height: 1.5;
  margin: 1rem 0 0 0;
  border: 1px solid #ced4da;
}

.js-console {
  background: #2c3e50;
  border: 1px solid #ced4da;
  border-radius: 0.5rem;
  overflow: hidden;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
  margin-top: 1rem;
}
.js-console .console-output {
  background: #34495e;
  color: #ecf0f1;
  padding: 1rem;
  min-height: 200px;
  max-height: 400px;
  overflow-y: auto;
  line-height: 1.5;
}
.js-console .console-output .console-command {
  color: #10b981;
  margin-bottom: 0.25rem;
  font-weight: 500;
}
.js-console .console-output .console-result {
  color: #ecf0f1;
  margin-bottom: 0.75rem;
  padding-left: 1rem;
}
.js-console .console-output .console-error {
  color: #dc3545;
  margin-bottom: 0.75rem;
  padding-left: 1rem;
}
.js-console .console-input-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: #2c3e50;
  border-top: 1px solid #ced4da;
  padding: 0.75rem 1rem;
}
.js-console .console-input-container .prompt {
  color: #10b981;
  font-weight: 700;
  flex-shrink: 0;
}
.js-console .console-input-container .console-input {
  flex: 1;
  background: transparent;
  border: none;
  color: #ecf0f1;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
  outline: none;
  padding: 0.25rem;
}
.js-console .console-input-container .console-input::placeholder {
  color: rgba(236, 240, 241, 0.5);
}
.js-console .console-input-container .console-input:focus {
  background: rgba(255, 255, 255, 0.05);
}

.console-container {
  margin-top: 1.25rem;
  background: #2c3e50;
  border: 1px solid #ced4da;
  border-radius: 0.5rem;
  overflow: hidden;
}
.console-container .console-header {
  background: #34495e;
  color: #ecf0f1;
  padding: 0.75rem 1rem;
  font-weight: 600;
  font-size: 0.875rem;
  border-bottom: 1px solid #ced4da;
}
.console-container .console-output {
  background: #2c3e50;
  color: #ecf0f1;
  padding: 1rem;
  min-height: 150px;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
  line-height: 1.5;
}

.color-box {
  width: 200px;
  height: 200px;
  border-radius: 0.5rem;
  margin: 1rem auto;
  transition: background 0.3s ease;
  border: 2px solid #e9ecef;
}

.result-box {
  margin-top: 1rem;
  padding: 1rem;
  background: #e9ecef;
  border: 1px solid #e9ecef;
  border-radius: 0.5rem;
  animation: fadeIn 0.3s ease forwards;
  display: none;
}
.result-box.show {
  display: block;
}
.result-box.success {
  background: rgba(40, 167, 69, 0.1);
  border-color: #28a745;
}
.result-box.success .success {
  color: #28a745;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 500;
}
.result-box.success .success i {
  font-size: 1.125rem;
}
.result-box.error {
  background: rgba(220, 53, 69, 0.1);
  border-color: #dc3545;
}
.result-box.error .error {
  color: #dc3545;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 500;
}
.result-box.error .error i {
  font-size: 1.125rem;
}
.result-box.warning {
  background: rgba(255, 193, 7, 0.1);
  border-color: #ffc107;
}
.result-box.warning .warning {
  color: #ffc107;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 500;
}
.result-box.warning .warning i {
  font-size: 1.125rem;
}
.result-box h4 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  color: #4CAF50;
}
.result-box p {
  margin: 0;
  color: #000000;
}

.live-clock {
  background: #2c3e50;
  color: #ecf0f1;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 1.5rem;
  font-weight: 700;
  padding: 1.25rem;
  text-align: center;
  border-radius: 0.5rem;
  border: 2px solid #4CAF50;
  margin: 1rem 0;
  letter-spacing: 2px;
}

.navigation-section {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid #e9ecef;
  padding: 2.5rem 0;
  margin-top: 2.5rem;
}
.navigation-section .nav-links {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
}
@media (max-width: 768px) {
  .navigation-section .nav-links {
    gap: 1.25rem;
  }
}
@media (max-width: 576px) {
  .navigation-section .nav-links {
    flex-direction: column;
    gap: 1rem;
  }
}
.navigation-section .nav-link {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  font-size: 1.125rem;
  font-weight: 500;
  text-decoration: none;
  color: #4CAF50;
  transition: all 0.3s ease;
  border-radius: 0.5rem;
}
.navigation-section .nav-link:hover {
  color: #45a049;
  transform: translateY(-1px);
}
.navigation-section .nav-link:active {
  transform: translateY(0);
}
.navigation-section .nav-link i {
  font-size: 1.125rem;
  flex-shrink: 0;
  transition: transform 0.3s ease;
}
.navigation-section .nav-link span {
  white-space: nowrap;
}
.navigation-section .nav-link .nav-topic-title {
  color: #000000;
  font-size: 0.875rem;
  font-weight: 400;
  margin-top: 0.25rem;
  display: block;
  opacity: 0.8;
}
@media (max-width: 576px) {
  .navigation-section .nav-link {
    padding: 1rem 1.25rem;
    font-size: 1rem;
  }
  .navigation-section .nav-link .nav-topic-title {
    display: none;
  }
  .navigation-section .nav-link span:not(.nav-topic-title) {
    font-size: 0.875rem;
    color: #4CAF50;
  }
}
@media (max-width: 0) {
  .navigation-section .nav-link {
    gap: 0.75rem;
    padding: 0.75rem 1rem;
  }
  .navigation-section .nav-link i {
    font-size: 1.125rem;
  }
}
.navigation-section .nav-previous {
  justify-content: flex-start;
  text-align: left;
}
.navigation-section .nav-previous i {
  order: -1;
}
.navigation-section .nav-next {
  justify-content: flex-end;
  text-align: right;
}
.navigation-section .nav-next i {
  order: 1;
}

.code-playground .playground-tabs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  background: #f8f9fa;
  padding: 0.25rem;
  border-radius: 0.625rem;
}
.code-playground .playground-tabs .tab-button {
  flex: 1;
  padding: 0.75rem 1.25rem;
  border: none;
  background: transparent;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: all 0.3s ease;
  font-weight: 600;
  color: #000000;
}
.code-playground .playground-tabs .tab-button.active {
  background: #4CAF50;
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
}
.code-playground .playground-tabs .tab-button:hover:not(.active) {
  background: rgba(76, 175, 80, 0.1);
  color: #4CAF50;
}
.code-playground .playground-tabs {
  margin-bottom: 1.25rem;
}
.code-playground .playground-content {
  background: #2c3e50;
  border-radius: 0.625rem;
  overflow: hidden;
}
.code-playground .playground-content .code-editor {
  background: #2c3e50;
  color: #ecf0f1;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
  line-height: 1.5;
  padding: 1.25rem;
  border: none;
  outline: none;
  resize: vertical;
  min-height: 200px;
  width: 100%;
}
.code-playground .playground-content .playground-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  background: #34495e;
  border-top: 1px solid #ced4da;
}
.code-playground .playground-content .playground-controls .control-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}
.code-playground .playground-content .playground-controls .run-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.code-playground .playground-content .playground-controls .run-button:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.code-playground .playground-content .playground-controls .run-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.code-playground .playground-content .playground-controls .run-button {
  background: linear-gradient(135deg, #4CAF50, #45a049);
  color: white;
}
.code-playground .playground-content .playground-controls .run-button:hover:not(:disabled) {
  background: linear-gradient(135deg, #45a049, #3d8b40);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
}
.code-playground .playground-content .playground-controls .run-button:active:not(:disabled) {
  transform: translateY(0);
}
.code-playground .playground-content .playground-controls .run-button {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  gap: 0.5rem;
}
.code-playground .playground-content .playground-controls .reset-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.code-playground .playground-content .playground-controls .reset-button:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.code-playground .playground-content .playground-controls .reset-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.code-playground .playground-content .playground-controls .reset-button {
  background: #f8f9fa;
  color: #000000;
  border: 2px solid #e9ecef;
}
.code-playground .playground-content .playground-controls .reset-button:hover:not(:disabled) {
  background: #e9ecef;
  border-color: #4CAF50;
  transform: translateY(-2px);
}
.code-playground .playground-content .playground-controls .reset-button {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}
.code-playground .playground-content .output-area {
  background: white;
  border-top: 1px solid #e9ecef;
  padding: 1.25rem;
  min-height: 100px;
}
.code-playground .playground-content .output-area iframe {
  width: 100%;
  height: 200px;
  border: none;
  border-radius: 0.5rem;
}

.quiz-container .quiz-progress {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}
.quiz-container .quiz-progress .quiz-info {
  font-size: 0.875rem;
  color: #000000;
}
.quiz-container .quiz-progress .progress-bar {
  height: 8px;
  background: #e9ecef;
  border-radius: 0.25rem;
  overflow: hidden;
  position: relative;
}
.quiz-container .quiz-progress .progress-bar .progress-fill {
  height: 100%;
  background: #4CAF50;
  border-radius: 0.25rem;
  width: 0%;
  transition: width 0.3s ease;
  position: relative;
}
.quiz-container .quiz-progress .progress-bar .progress-fill::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  animation: shimmer 2s infinite;
}
.quiz-container .quiz-progress .progress-bar {
  width: 200px;
}
.quiz-container .quiz-question {
  background: white;
  padding: 2rem;
  border-radius: 0.625rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
.quiz-container .quiz-question h3 {
  margin-bottom: 1.5rem;
  color: #000000;
}
.quiz-container .quiz-question .quiz-options {
  display: grid;
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.quiz-container .quiz-question .quiz-options .quiz-option {
  padding: 1.25rem 1.5rem;
  border: 2px solid #e9ecef;
  background: white;
  border-radius: 0.625rem;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 1rem;
  text-align: left;
}
.quiz-container .quiz-question .quiz-options .quiz-option:hover:not(:disabled) {
  border-color: #4CAF50;
  background: rgba(76, 175, 80, 0.05);
  transform: translateY(-2px);
}
.quiz-container .quiz-question .quiz-options .quiz-option.correct {
  background: #d4edda;
  border-color: #28a745;
  color: rgb(32, 133.6, 55.2);
}
.quiz-container .quiz-question .quiz-options .quiz-option.incorrect {
  background: #f8d7da;
  border-color: #dc3545;
  color: rgb(209.4151898734, 36.2848101266, 52.8721518987);
}
.quiz-container .quiz-question .quiz-options .quiz-option:disabled {
  cursor: not-allowed;
}
.quiz-container .quiz-feedback {
  background: white;
  padding: 1.5rem;
  border-radius: 0.625rem;
  margin-bottom: 1.5rem;
  border-left: 4px solid #4CAF50;
}
.quiz-container .quiz-feedback .correct {
  color: #28a745;
}
.quiz-container .quiz-feedback .incorrect {
  color: #dc3545;
}
.quiz-container .quiz-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.quiz-container .quiz-controls #quiz-next {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.quiz-container .quiz-controls #quiz-next:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.quiz-container .quiz-controls #quiz-next:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.quiz-container .quiz-controls #quiz-next {
  background: linear-gradient(135deg, #4CAF50, #45a049);
  color: white;
}
.quiz-container .quiz-controls #quiz-next:hover:not(:disabled) {
  background: linear-gradient(135deg, #45a049, #3d8b40);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
}
.quiz-container .quiz-controls #quiz-next:active:not(:disabled) {
  transform: translateY(0);
}
.quiz-container .quiz-controls #quiz-next {
  gap: 0.5rem;
}
.quiz-container .quiz-controls #quiz-next i {
  transition: transform 0.15s ease;
}
.quiz-container .quiz-controls #quiz-next:hover i {
  transform: translateX(3px);
}
.quiz-container .quiz-results {
  text-align: center;
  background: white;
  padding: 2.5rem;
  border-radius: 0.625rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}
.quiz-container .quiz-results .results-icon {
  width: 80px;
  height: 80px;
  background: #28a745;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
}
.quiz-container .quiz-results .results-icon i {
  font-size: 1.875rem;
  color: white;
}
.quiz-container .quiz-results h3 {
  margin-bottom: 1rem;
  color: #000000;
}
.quiz-container .quiz-results #final-score {
  font-size: 1.875rem;
  font-weight: 700;
  color: #4CAF50;
  margin: 1.25rem 0;
}
.quiz-container .quiz-results .results-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-top: 1.5rem;
}
@media (max-width: 576px) {
  .quiz-container .quiz-results .results-actions {
    flex-direction: column;
    width: 100%;
  }
  .quiz-container .quiz-results .results-actions button {
    width: 100%;
  }
}

.understanding-check {
  background: rgba(23, 162, 184, 0.1);
  border: 1px solid rgba(23, 162, 184, 0.3);
  border-radius: 0.625rem;
  padding: 1.5rem;
  margin: 2rem 0;
}
.understanding-check .check-question {
  font-weight: 600;
  margin-bottom: 1.25rem;
  color: #000000;
}
.understanding-check .check-options {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}
@media (max-width: 576px) {
  .understanding-check .check-options {
    flex-direction: column;
    align-items: stretch;
  }
}
.understanding-check .check-options .check-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.understanding-check .check-options .check-btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.understanding-check .check-options .check-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.understanding-check .check-options .check-btn {
  background: transparent;
  color: #4CAF50;
  border: 2px solid #4CAF50;
}
.understanding-check .check-options .check-btn:hover:not(:disabled) {
  background: #4CAF50;
  color: white;
  transform: translateY(-2px);
}
.understanding-check .check-options .check-btn.correct {
  background: #28a745;
  border-color: #28a745;
  color: white;
}
.understanding-check .check-options .check-btn.incorrect {
  background: #dc3545;
  border-color: #dc3545;
  color: white;
}
.understanding-check #check-feedback {
  font-size: 0.875rem;
  text-align: center;
}
.understanding-check #check-feedback .correct {
  color: #28a745;
  font-weight: 600;
}
.understanding-check #check-feedback .incorrect {
  color: #dc3545;
  font-weight: 600;
}

.topic-navigation {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 2px solid #e9ecef;
}
@media (max-width: 576px) {
  .topic-navigation {
    flex-direction: column;
    gap: 1rem;
  }
  .topic-navigation .nav-button {
    width: 100%;
  }
}
.topic-navigation .nav-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.topic-navigation .nav-button:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.topic-navigation .nav-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.topic-navigation .nav-button {
  background: linear-gradient(135deg, #4CAF50, #45a049);
  color: white;
}
.topic-navigation .nav-button:hover:not(:disabled) {
  background: linear-gradient(135deg, #45a049, #3d8b40);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
}
.topic-navigation .nav-button:active:not(:disabled) {
  transform: translateY(0);
}
.topic-navigation .nav-button {
  gap: 0.75rem;
  padding: 1.25rem 2rem;
  font-size: 1rem;
}
.topic-navigation .nav-button.prev i {
  transition: transform 0.15s ease;
}
.topic-navigation .nav-button.next i {
  transition: transform 0.15s ease;
}
.topic-navigation .nav-button.prev:hover i {
  transform: translateX(-3px);
}
.topic-navigation .nav-button.next:hover i {
  transform: translateX(3px);
}
.topic-navigation .nav-button:disabled {
  background: #e9ecef;
  color: #495057;
  cursor: not-allowed;
}
.topic-navigation .complete-lesson {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.topic-navigation .complete-lesson:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.topic-navigation .complete-lesson:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.topic-navigation .complete-lesson {
  background: linear-gradient(135deg, #4CAF50, #45a049);
  color: white;
}
.topic-navigation .complete-lesson:hover:not(:disabled) {
  background: linear-gradient(135deg, #45a049, #3d8b40);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
}
.topic-navigation .complete-lesson:active:not(:disabled) {
  transform: translateY(0);
}
.topic-navigation .complete-lesson {
  background: #28a745;
  padding: 1.25rem 2.5rem;
  font-size: 1.125rem;
  gap: 0.75rem;
}
.topic-navigation .complete-lesson:hover {
  background: rgb(36, 150.3, 62.1);
}

@media (max-width: 576px) {
  .topic-page .topic-header {
    padding: 2rem 0;
  }
  .topic-page .topic-header .topic-title {
    font-size: 1.5rem;
  }
  .topic-page .topic-header .topic-subtitle {
    font-size: 1rem;
  }
  .content-section {
    margin-bottom: 2rem;
  }
  .content-section h2 {
    font-size: 1.25rem;
  }
  .content-section h3 {
    font-size: 1.125rem;
  }
  .interactive-element .element-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
  .quiz-container .quiz-progress {
    flex-direction: column;
    gap: 1rem;
  }
  .quiz-container .quiz-progress .progress-bar {
    width: 100%;
  }
  .quiz-container .quiz-question {
    padding: 1.5rem;
  }
  .quiz-container .quiz-question .quiz-options .quiz-option {
    padding: 1rem;
    font-size: 0.875rem;
  }
}
.run-btn, .check-btn, .simulate-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.run-btn:focus, .check-btn:focus, .simulate-btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.run-btn:disabled, .check-btn:disabled, .simulate-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.run-btn, .check-btn, .simulate-btn {
  background: linear-gradient(135deg, #4CAF50, #45a049);
  color: white;
}
.run-btn:hover:not(:disabled), .check-btn:hover:not(:disabled), .simulate-btn:hover:not(:disabled) {
  background: linear-gradient(135deg, #45a049, #3d8b40);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
}
.run-btn:active:not(:disabled), .check-btn:active:not(:disabled), .simulate-btn:active:not(:disabled) {
  transform: translateY(0);
}
.run-btn, .check-btn, .simulate-btn {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  border-radius: 0.25rem;
}
.run-btn:hover, .check-btn:hover, .simulate-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.check-btn {
  background: #28a745;
  border-color: #28a745;
}
.check-btn:hover {
  background: rgb(36, 150.3, 62.1);
  border-color: rgb(36, 150.3, 62.1);
}

.simulate-btn {
  background: #2196F3;
  border-color: #2196F3;
}
.simulate-btn:hover {
  background: rgb(12.7384615385, 136.9384615385, 235.6615384615);
  border-color: rgb(12.7384615385, 136.9384615385, 235.6615384615);
}

.tab-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.tab-btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.tab-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.tab-btn {
  background: transparent;
  color: #4CAF50;
  border: 2px solid #4CAF50;
}
.tab-btn:hover:not(:disabled) {
  background: #4CAF50;
  color: white;
  transform: translateY(-2px);
}
.tab-btn {
  padding: 0.75rem 1rem;
  border-radius: 0.5rem 0.5rem 0 0;
  border-bottom: none;
  font-size: 0.875rem;
  font-weight: 500;
  background: #e9ecef;
  color: #000000;
  transition: all 0.15s ease;
  position: relative;
  z-index: 1;
  border: 1px solid #e9ecef;
  border-bottom: none;
}
.tab-btn.active {
  background: white;
  border-color: #e9ecef #e9ecef white #e9ecef;
  color: #4CAF50;
  box-shadow: none;
  transform: none;
  border-bottom: #4CAF50;
}
.tab-btn.active::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: white;
  z-index: 2;
}
.tab-btn:hover:not(.active) {
  background: rgba(76, 175, 80, 0.05);
  color: #4CAF50;
  border-color: rgba(76, 175, 80, 0.3);
  transform: translateY(-1px);
  box-shadow: 0 2px 4px rgba(76, 175, 80, 0.1);
}
.tab-btn:focus {
  outline: 2px solid #4CAF50;
  outline-offset: 2px;
  background: rgba(76, 175, 80, 0.05);
}
.tab-btn:active {
  transform: translateY(0);
  box-shadow: none;
}

.demo-controls {
  text-align: center;
  margin: 1rem 0 1.5rem 0;
  padding: 1rem;
  background: #e9ecef;
  border-radius: 0.625rem;
  border: 1px solid #e9ecef;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
.demo-controls button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.demo-controls button:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.demo-controls button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.demo-controls button {
  background: #f8f9fa;
  color: #000000;
  border: 2px solid #e9ecef;
}
.demo-controls button:hover:not(:disabled) {
  background: #e9ecef;
  border-color: #4CAF50;
  transform: translateY(-2px);
}
.demo-controls button {
  padding: 1rem 1.25rem;
  font-size: 1rem;
  border-radius: 0.5rem;
  margin: 0.5rem;
  transition: all 0.3s ease;
}
.demo-controls button:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  background: #4CAF50;
  color: white;
}
.demo-controls button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  background: #495057;
  color: white;
}
.demo-controls #demo-status {
  display: block;
  margin-top: 1rem;
  font-size: 0.875rem;
  color: #000000;
  font-weight: 500;
  min-height: 1.5em;
}
.demo-controls.compact {
  padding: 0.75rem;
  margin: 0.75rem 0 1.25rem 0;
}
.demo-controls.compact .control-group {
  margin-bottom: 1rem;
}
.demo-controls.compact .control-group:last-child {
  margin-bottom: 0;
}
.demo-controls.compact .control-group h5 {
  margin: 0 0 0.5rem 0;
  font-size: 0.875rem;
  font-weight: 600;
  color: #000000;
  text-align: left;
}
.demo-controls.compact .control-group .control-row {
  display: flex;
  gap: 0.75rem;
  align-items: flex-end;
}
@media (max-width: 576px) {
  .demo-controls.compact .control-group .control-row {
    flex-direction: column;
    gap: 0.5rem;
  }
}
.demo-controls.compact .button-group.compact {
  display: flex;
  gap: 0.25rem;
  justify-content: flex-start;
  flex-wrap: wrap;
}
.demo-controls.compact .button-group.compact .btn.small {
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  border-radius: 0.25rem;
  margin: 0;
}
.demo-controls.compact .code-block.compact {
  margin-top: 0.75rem;
}
.demo-controls.compact .code-block.compact h5 {
  margin: 0 0 0.25rem 0;
  font-size: 0.875rem;
  font-weight: 600;
  color: #000000;
}
.demo-controls.compact .code-block.compact pre {
  margin: 0;
  font-size: 0.75rem;
}

.communication-demo {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  margin: 1.5rem 0;
  padding: 1.5rem;
  background: linear-gradient(135deg, #e9ecef 0%, rgba(76, 175, 80, 0.02) 100%);
  border: 1px solid #e9ecef;
}
.communication-demo .demo-controls {
  text-align: center;
  margin-bottom: 1.25rem;
}
.communication-demo .demo-controls .demo-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.communication-demo .demo-controls .demo-button:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.communication-demo .demo-controls .demo-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.communication-demo .demo-controls .demo-button {
  background: linear-gradient(135deg, #4CAF50, #45a049);
  color: white;
}
.communication-demo .demo-controls .demo-button:hover:not(:disabled) {
  background: linear-gradient(135deg, #45a049, #3d8b40);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
}
.communication-demo .demo-controls .demo-button:active:not(:disabled) {
  transform: translateY(0);
}
.communication-demo .demo-controls .demo-button {
  padding: 1rem 1.25rem;
  font-size: 1rem;
  border-radius: 0.5rem;
  margin: 0 0.5rem;
  transition: all 0.3s ease;
}
.communication-demo .demo-controls .demo-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}
.communication-demo .control-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 1rem;
  padding: 0.75rem;
  background: linear-gradient(135deg, rgba(233, 236, 239, 0.3), rgba(233, 236, 239, 0.1));
  border-radius: 0.625rem;
  border: 1px solid rgba(233, 236, 239, 0.8);
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
  backdrop-filter: blur(10px);
}
.communication-demo .control-group .demo-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.communication-demo .control-group .demo-button:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.communication-demo .control-group .demo-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.communication-demo .control-group .demo-button {
  background: linear-gradient(135deg, #4CAF50, #45a049);
  color: white;
}
.communication-demo .control-group .demo-button:hover:not(:disabled) {
  background: linear-gradient(135deg, #45a049, #3d8b40);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
}
.communication-demo .control-group .demo-button:active:not(:disabled) {
  transform: translateY(0);
}
.communication-demo .control-group .demo-button {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  border-radius: 0.5rem;
  min-width: 80px;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  position: relative;
  overflow: hidden;
}
.communication-demo .control-group .demo-button::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s ease;
}
.communication-demo .control-group .demo-button:hover:not(.disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(76, 175, 80, 0.3);
}
.communication-demo .control-group .demo-button:hover:not(.disabled)::before {
  left: 100%;
}
.communication-demo .control-group .demo-button:active:not(.disabled) {
  transform: translateY(0);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}
.communication-demo .control-group .demo-button.disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
  background: #e9ecef !important;
  color: #000000 !important;
  border: 1px solid #e9ecef !important;
  transform: none !important;
  box-shadow: none !important;
}
.communication-demo .control-group .demo-button.disabled::before {
  display: none;
}
.communication-demo .control-group .demo-button i {
  font-size: 0.875rem;
  z-index: 1;
  position: relative;
}
.communication-demo .control-group .demo-button span {
  z-index: 1;
  position: relative;
}
.communication-demo .control-group .demo-button:not(:has(span)) {
  min-width: 50px;
  padding: 0.5rem;
  border-radius: 50%;
}
.communication-demo .control-group .demo-button:not(:has(span)):hover:not(.disabled) {
  border-radius: 50%;
}
.communication-demo .control-group .demo-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100px;
  height: 6px;
  border-radius: 3px;
  background: #e9ecef;
  outline: none;
  transition: background 0.3s ease;
  margin: 0 0.5rem;
  vertical-align: middle;
}
.communication-demo .control-group .demo-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #4CAF50;
  cursor: pointer;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  transition: all 0.3s ease;
}
.communication-demo .control-group .demo-slider::-webkit-slider-thumb:hover {
  background: #45a049;
  transform: scale(1.1);
}
.communication-demo .control-group .demo-slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #4CAF50;
  cursor: pointer;
  border: none;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  transition: all 0.3s ease;
}
.communication-demo .control-group .demo-slider::-moz-range-thumb:hover {
  background: #45a049;
  transform: scale(1.1);
}
.communication-demo .control-group .demo-slider:focus {
  box-shadow: 0 0 0 2px rgba(76, 175, 80, 0.2);
}
.communication-demo .control-group span {
  font-size: 0.875rem;
  font-weight: 500;
  color: #000000;
  min-width: 40px;
  text-align: center;
  background: #ffffff;
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  border: 1px solid #e9ecef;
}
@media (max-width: 576px) {
  .communication-demo .control-group {
    gap: 0.5rem;
    padding: 0.5rem;
  }
  .communication-demo .control-group .demo-button {
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    min-width: 70px;
  }
  .communication-demo .control-group .demo-button:not(:has(span)) {
    min-width: 40px;
    padding: 0.25rem;
  }
  .communication-demo .control-group .demo-slider {
    width: 80px;
  }
  .communication-demo .control-group span {
    font-size: 0.75rem;
    min-width: 35px;
    padding: 0.25rem;
  }
}
.communication-demo .demo-visualization {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 1.5rem 0;
  padding: 1.25rem;
  background: white;
  border-radius: 0.625rem;
  border: 2px solid #e9ecef;
  min-height: 200px;
}
.communication-demo .demo-visualization .client-box,
.communication-demo .demo-visualization .server-box {
  flex: 1;
  max-width: 300px;
  padding: 1rem;
  border-radius: 0.5rem;
  background: #e9ecef;
  border: 2px solid #e9ecef;
  position: relative;
}
.communication-demo .demo-visualization .client-box .box-header,
.communication-demo .demo-visualization .server-box .box-header {
  font-weight: 700;
  color: #4CAF50;
  margin-bottom: 0.75rem;
  text-align: center;
  font-size: 1.125rem;
}
.communication-demo .demo-visualization .client-box .box-content,
.communication-demo .demo-visualization .server-box .box-content {
  min-height: 80px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}
.communication-demo .demo-visualization .client-box .box-content .request-message,
.communication-demo .demo-visualization .client-box .box-content .response-message,
.communication-demo .demo-visualization .client-box .box-content .processing-message,
.communication-demo .demo-visualization .client-box .box-content .ready-message,
.communication-demo .demo-visualization .server-box .box-content .request-message,
.communication-demo .demo-visualization .server-box .box-content .response-message,
.communication-demo .demo-visualization .server-box .box-content .processing-message,
.communication-demo .demo-visualization .server-box .box-content .ready-message {
  display: none;
  padding: 0.5rem 0.75rem;
  background: #4CAF50;
  color: white;
  border-radius: 0.25rem;
  font-size: 0.875rem;
  margin: 0.25rem 0;
  animation: fadeIn 0.5s ease-in-out;
}
.communication-demo .demo-visualization .client-box .box-content .processing-message,
.communication-demo .demo-visualization .server-box .box-content .processing-message {
  background: #ffc107;
  color: #000000;
}
.communication-demo .demo-visualization .client-box .box-content .ready-message,
.communication-demo .demo-visualization .server-box .box-content .ready-message {
  background: #28a745;
  color: white;
}
.communication-demo .demo-visualization .client-box .box-content .response-message,
.communication-demo .demo-visualization .server-box .box-content .response-message {
  background: #28a745;
  color: white;
}
.communication-demo .demo-visualization .network-flow {
  position: relative;
  flex: 1;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.communication-demo .demo-visualization .network-flow .packet {
  display: none;
  position: absolute;
  font-size: 1.5rem;
  color: #4CAF50;
  z-index: 10;
}
.communication-demo .demo-visualization .network-flow .packet.packet1 {
  left: 20px;
}
.communication-demo .demo-visualization .network-flow .packet.packet2 {
  right: 20px;
}

.quiz-option button:not([class]) {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.quiz-option button:not([class]):focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.quiz-option button:not([class]):disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.quiz-option button:not([class]) {
  background: transparent;
  color: #4CAF50;
  border: 2px solid #4CAF50;
}
.quiz-option button:not([class]):hover:not(:disabled) {
  background: #4CAF50;
  color: white;
  transform: translateY(-2px);
}
.quiz-option button:not([class]) {
  width: 100%;
  text-align: left;
  padding: 1rem;
  border-radius: 0.5rem;
}
.quiz-option button:not([class]):hover {
  background: rgba(76, 175, 80, 0.1);
  color: #4CAF50;
  border-color: #4CAF50;
}
.quiz-option button:not([class]).correct {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.quiz-option button:not([class]).correct:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.quiz-option button:not([class]).correct:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.quiz-option button:not([class]).correct {
  background: linear-gradient(135deg, #4CAF50, #45a049);
  color: white;
}
.quiz-option button:not([class]).correct:hover:not(:disabled) {
  background: linear-gradient(135deg, #45a049, #3d8b40);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
}
.quiz-option button:not([class]).correct:active:not(:disabled) {
  transform: translateY(0);
}
.quiz-option button:not([class]).correct {
  background: #28a745;
  border-color: #28a745;
}
.quiz-option button:not([class]).correct:hover {
  background: rgb(36, 150.3, 62.1);
}
.quiz-option button:not([class]).incorrect {
  background: #dc3545;
  border-color: #dc3545;
  color: white;
}
.quiz-option button:not([class]).incorrect:hover {
  background: rgb(209.4151898734, 36.2848101266, 52.8721518987);
}

.code-example {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  margin: 2rem 0;
  border: 1px solid #e9ecef;
  overflow: visible;
}
.code-example h4 {
  background: #e9ecef;
  margin: 0;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid #e9ecef;
  color: #000000;
  font-size: 1rem;
}
.code-example h4 i {
  color: #4CAF50;
  margin-right: 0.5rem;
}
.code-example pre {
  margin: 1rem 0;
  overflow-x: auto;
  max-width: 100%;
  white-space: pre;
}

.code-editor-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}
@media (max-width: 768px) {
  .code-editor-container {
    grid-template-columns: 1fr;
  }
}

.code-editor .editor-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #2d2d2d;
  color: white;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid #444;
}
.code-editor .editor-header span {
  font-weight: 500;
  font-size: 0.875rem;
}
.code-editor textarea {
  width: 100%;
  height: 300px;
  border: none;
  background: #1e1e1e;
  color: #d4d4d4;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
  padding: 1rem;
  resize: none;
  line-height: 1.5;
}
.code-editor textarea:focus {
  outline: none;
  background: #252526;
}

.output-preview {
  border-left: 1px solid #e9ecef;
}
@media (max-width: 768px) {
  .output-preview {
    border-left: none;
    border-top: 1px solid #e9ecef;
  }
}
.output-preview .preview-header {
  background: #e9ecef;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid #e9ecef;
  font-weight: 500;
  font-size: 0.875rem;
  color: #000000;
}
.output-preview iframe {
  width: 100%;
  height: 300px;
  border: none;
  background: white;
}

.url-breakdown {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  padding: 1.5rem;
  margin: 2rem 0;
  background: linear-gradient(135deg, rgba(76, 175, 80, 0.05), rgba(33, 150, 243, 0.05));
  border: 1px solid rgba(76, 175, 80, 0.2);
}
.url-breakdown h4 {
  color: #000000;
  margin-bottom: 1.25rem;
  font-size: 1.125rem;
}

.url-parts .url-example {
  background: #1e1e1e;
  color: white;
  padding: 1rem;
  border-radius: 0.5rem;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 1rem;
  margin-bottom: 1rem;
  overflow-x: auto;
}
.url-parts .url-example .url-part {
  position: relative;
}
.url-parts .url-example .url-part.protocol {
  color: #569cd6;
}
.url-parts .url-example .url-part.domain {
  color: #4ec9b0;
}
.url-parts .url-example .url-part.port {
  color: #dcdcaa;
}
.url-parts .url-example .url-part.path {
  color: #ce9178;
}
.url-parts .url-example .url-part.query {
  color: #c586c0;
}
.url-parts .url-example .url-part.fragment {
  color: #9cdcfe;
}
.url-parts .url-labels {
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.url-parts .url-labels .label {
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: white;
}
.url-parts .url-labels .label.protocol {
  background: #569cd6;
}
.url-parts .url-labels .label.domain {
  background: #4ec9b0;
}
.url-parts .url-labels .label.port {
  background: #dcdcaa;
  color: #000;
}
.url-parts .url-labels .label.path {
  background: #ce9178;
}
.url-parts .url-labels .label.query {
  background: #c586c0;
}
.url-parts .url-labels .label.fragment {
  background: #9cdcfe;
  color: #000;
}

.interactive-element {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  padding: 1.5rem;
  margin: 2rem 0;
  border: 2px solid #4CAF50;
  background: white;
  position: relative;
  z-index: 1;
  overflow: visible;
}
.interactive-element::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(76, 175, 80, 0.03);
  z-index: -1;
  border-radius: inherit;
}
.interactive-element h4 {
  color: #4CAF50;
  margin-bottom: 1.25rem;
  font-weight: 700;
  position: relative;
  z-index: 2;
}
.interactive-element h4 i {
  margin-right: 0.5rem;
}

.url-builder .input-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1rem;
}
@media (max-width: 576px) {
  .url-builder .input-group {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}
.url-builder .input-group label {
  font-weight: 500;
  color: #000000;
  min-width: 80px;
}
.url-builder .input-group select, .url-builder .input-group input {
  padding: 1rem;
  border: 2px solid #e9ecef;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  transition: border-color 0.3s ease;
  background: #ffffff;
}
.url-builder .input-group select:focus, .url-builder .input-group input:focus {
  outline: none;
  border-color: #4CAF50;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.url-builder .input-group select::placeholder, .url-builder .input-group input::placeholder {
  color: #000000;
}
.url-builder .input-group select, .url-builder .input-group input {
  flex: 1;
  max-width: 200px;
}
.url-builder .url-result {
  background: #e9ecef;
  padding: 1rem;
  border-radius: 0.5rem;
  border: 1px solid #e9ecef;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  color: #4CAF50;
  font-weight: 500;
  word-break: break-all;
}

.quiz-game {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  padding: 1.5rem;
  margin: 1.5rem 0;
  background: linear-gradient(135deg, rgba(33, 150, 243, 0.1), rgba(76, 175, 80, 0.1));
  border: 1px solid rgba(33, 150, 243, 0.3);
}
.quiz-game .game-question {
  text-align: center;
}
.quiz-game .game-question p {
  font-size: 1.125rem;
  font-weight: 500;
  margin-bottom: 1.5rem;
  color: #000000;
}
.quiz-game .game-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1rem;
  margin-bottom: 1.25rem;
}
.quiz-game .game-options button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.quiz-game .game-options button:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.quiz-game .game-options button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.quiz-game .game-options button {
  background: transparent;
  color: #4CAF50;
  border: 2px solid #4CAF50;
}
.quiz-game .game-options button:hover:not(:disabled) {
  background: #4CAF50;
  color: white;
  transform: translateY(-2px);
}
.quiz-game .game-options button {
  padding: 1rem;
  font-size: 0.875rem;
  border-radius: 0.5rem;
  transition: all 0.3s ease;
}
.quiz-game .game-options button:hover {
  background: rgba(76, 175, 80, 0.1);
  color: #4CAF50;
  border-color: #4CAF50;
  transform: translateY(-2px);
}
.quiz-game .game-options button.correct {
  background: #28a745;
  border-color: #28a745;
  color: white;
}
.quiz-game .game-options button.correct:hover {
  background: rgb(36, 150.3, 62.1);
}
.quiz-game .game-options button.incorrect {
  background: #dc3545;
  border-color: #dc3545;
  color: white;
}
.quiz-game .game-options button.incorrect:hover {
  background: rgb(209.4151898734, 36.2848101266, 52.8721518987);
}
.quiz-game .game-feedback {
  padding: 1rem;
  border-radius: 0.5rem;
  text-align: center;
  font-weight: 500;
  margin-top: 1rem;
}
.quiz-game .game-feedback.correct {
  background: rgba(40, 167, 69, 0.1);
  color: #28a745;
  border: 1px solid rgba(40, 167, 69, 0.3);
}
.quiz-game .game-feedback.incorrect {
  background: rgba(220, 53, 69, 0.1);
  color: #dc3545;
  border: 1px solid rgba(220, 53, 69, 0.3);
}

.search-timeline .search-era {
  margin-bottom: 2rem;
}
.search-timeline .search-era h4 {
  color: #4CAF50;
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid rgba(76, 175, 80, 0.3);
}
.search-timeline .search-era .search-engines {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
}
.search-timeline .search-era .search-engines .search-engine {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.25rem;
  text-align: center;
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
}
.search-timeline .search-era .search-engines .search-engine:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  border-color: #4CAF50;
}
.search-timeline .search-era .search-engines .search-engine img {
  width: 48px;
  height: 48px;
  border-radius: 0.5rem;
}
.search-timeline .search-era .search-engines .search-engine span {
  font-weight: 500;
  color: #000000;
  font-size: 0.875rem;
}

.info-box {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  padding: 1.5rem;
  margin: 1.5rem 0;
  background: linear-gradient(135deg, rgba(23, 162, 184, 0.1), rgba(76, 175, 80, 0.05));
  border-left: 4px solid #17a2b8;
}
.info-box h3 {
  color: #17a2b8;
  margin-bottom: 1rem;
}
.info-box h3 i {
  margin-right: 0.5rem;
}
.info-box p {
  margin-bottom: 0;
  color: #000000;
  line-height: 1.625;
}

.quiz-container {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  padding: 2rem;
  margin: 2rem 0;
  border: 2px solid #4CAF50;
  background: rgba(76, 175, 80, 0.02);
}
.quiz-container .quiz-progress {
  display: flex;
  align-items: center;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}
@media (max-width: 576px) {
  .quiz-container .quiz-progress {
    flex-direction: column;
    gap: 1rem;
  }
}
.quiz-container .quiz-progress .progress-bar {
  flex: 1;
  height: 8px;
  background: #e9ecef;
  border-radius: 50%;
  overflow: hidden;
  margin-right: 1rem;
}
@media (max-width: 576px) {
  .quiz-container .quiz-progress .progress-bar {
    width: 100%;
    margin-right: 0;
  }
}
.quiz-container .quiz-progress .progress-bar .progress-fill {
  height: 100%;
  background: linear-gradient(135deg, #4CAF50, #45a049);
  border-radius: 50%;
  transition: width 0.5s ease;
}
.quiz-container .quiz-progress .progress-text {
  font-size: 0.875rem;
  font-weight: 500;
  color: #000000;
  white-space: nowrap;
}
.quiz-container .quiz-question {
  text-align: center;
}
.quiz-container .quiz-question h3 {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  color: #000000;
}
.quiz-container .quiz-question .quiz-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}
.quiz-container .quiz-question .quiz-options .quiz-option {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.quiz-container .quiz-question .quiz-options .quiz-option:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.quiz-container .quiz-question .quiz-options .quiz-option:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.quiz-container .quiz-question .quiz-options .quiz-option {
  background: transparent;
  color: #4CAF50;
  border: 2px solid #4CAF50;
}
.quiz-container .quiz-question .quiz-options .quiz-option:hover:not(:disabled) {
  background: #4CAF50;
  color: white;
  transform: translateY(-2px);
}
.quiz-container .quiz-question .quiz-options .quiz-option {
  padding: 1.25rem;
  text-align: center;
  border-radius: 0.625rem;
  font-size: 1rem;
  transition: all 0.3s ease;
}
.quiz-container .quiz-question .quiz-options .quiz-option:hover {
  background: rgba(76, 175, 80, 0.1);
  color: #4CAF50;
  border-color: #4CAF50;
  transform: translateY(-2px);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
.quiz-container .quiz-question .quiz-options .quiz-option.selected {
  background: #4CAF50;
  color: white;
  border-color: #4CAF50;
}
.quiz-container .quiz-question .quiz-options .quiz-option.correct {
  background: #28a745;
  border-color: #28a745;
  color: white;
}
.quiz-container .quiz-question .quiz-options .quiz-option.correct:hover {
  background: rgb(36, 150.3, 62.1);
}
.quiz-container .quiz-question .quiz-options .quiz-option.incorrect {
  background: #dc3545;
  border-color: #dc3545;
  color: white;
}
.quiz-container .quiz-question .quiz-options .quiz-option.incorrect:hover {
  background: rgb(209.4151898734, 36.2848101266, 52.8721518987);
}

.demo-container {
  margin: 1.5rem 0;
}
.demo-container .demo-tabs {
  display: flex;
  margin-bottom: 0;
  border-bottom: 1px solid #e9ecef;
}
.demo-container .demo-content {
  display: none;
  padding: 1.5rem;
  border: 1px solid #e9ecef;
  border-top: none;
  background: white;
}
.demo-container .demo-content.active {
  display: block;
}
.demo-container .demo-content .mock-browser {
  border: 2px solid #ced4da;
  border-radius: 0.625rem;
  overflow: hidden;
  background: white;
}
.demo-container .demo-content .mock-browser .browser-bar {
  background: #e9ecef;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid #e9ecef;
  font-weight: 500;
  color: #000000;
  font-size: 0.875rem;
}
.demo-container .demo-content .mock-browser .browser-content {
  padding: 1.25rem;
  min-height: 200px;
}
.demo-container .demo-content .mock-browser .browser-content h3 {
  margin-bottom: 1rem;
  color: #000000;
}
.demo-container .demo-content .mock-browser .browser-content .social-feed .update {
  background: #e9ecef;
  padding: 1rem;
  border-radius: 0.5rem;
  margin-bottom: 0.75rem;
  border: 1px solid #e9ecef;
}
.demo-container .demo-content .mock-browser .browser-content .social-feed .update .user {
  font-weight: 600;
  color: #4CAF50;
  margin-bottom: 0.5rem;
}
.demo-container .demo-content .mock-browser .browser-content .social-feed .update .content {
  color: #000000;
  margin-bottom: 0.5rem;
}
.demo-container .demo-content .mock-browser .browser-content .social-feed .update .actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}
.demo-container .demo-content .mock-browser .browser-content .social-feed .update .actions button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.demo-container .demo-content .mock-browser .browser-content .social-feed .update .actions button:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.demo-container .demo-content .mock-browser .browser-content .social-feed .update .actions button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.demo-container .demo-content .mock-browser .browser-content .social-feed .update .actions button {
  background: transparent;
  color: #4CAF50;
  border: 2px solid #4CAF50;
}
.demo-container .demo-content .mock-browser .browser-content .social-feed .update .actions button:hover:not(:disabled) {
  background: #4CAF50;
  color: white;
  transform: translateY(-2px);
}
.demo-container .demo-content .mock-browser .browser-content .social-feed .update .actions button {
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  border-radius: 0.25rem;
}
.demo-container .demo-content .mock-browser .browser-content .social-feed .update .actions button:hover {
  background: rgba(76, 175, 80, 0.1);
  color: #4CAF50;
  border-color: #4CAF50;
}
.demo-container .demo-content .mock-browser .browser-content .social-feed .post-form {
  background: white;
  padding: 1rem;
  border: 1px solid #e9ecef;
  border-radius: 0.5rem;
  margin-bottom: 1rem;
}
.demo-container .demo-content .mock-browser .browser-content .social-feed .post-form textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid #e9ecef;
  border-radius: 0.25rem;
  resize: vertical;
  font-family: inherit;
  margin-bottom: 0.75rem;
}
.demo-container .demo-content .mock-browser .browser-content .social-feed .post-form textarea:focus {
  outline: none;
  border-color: #4CAF50;
}

.timeline-section {
  margin: 2rem 0;
}
.timeline-section h3 {
  color: #4CAF50;
  margin-bottom: 1.5rem;
  text-align: center;
  font-size: 1.25rem;
  font-weight: 700;
}

.timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 0;
}

.timeline-item {
  display: flex;
  position: relative;
  margin-bottom: 2.5rem;
}
.timeline-item::before {
  background: #dadee4;
  content: "";
  height: 100%;
  left: 19px;
  position: absolute;
  top: 20px;
  width: 2px;
  z-index: -1;
}
.timeline-item:last-child::before {
  display: none;
}

.timeline-year {
  margin-top: 20px;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #4CAF50, rgb(60.5577689243, 139.4422310757, 63.7450199203));
  color: white;
  border-radius: 50%;
  font-size: 0.875rem;
  font-weight: 700;
  box-shadow: 0 2px 8px rgba(76, 175, 80, 0.3);
  flex-shrink: 0;
  z-index: 2;
}

.timeline-content {
  flex: 1 1 auto;
  padding: 0 0 0 1rem;
}
.timeline-content .timeline-card {
  max-height: 300px;
  background: white;
  border: 1px solid #e9ecef;
  border-radius: 0.625rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  overflow: hidden;
  transition: all 0.3s ease;
}
.timeline-content .timeline-card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  transform: translateY(-2px);
}
.timeline-content .timeline-card .timeline-card-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid #e9ecef;
  background: rgb(238.9052631579, 241.1, 243.2947368421);
}
.timeline-content .timeline-card .timeline-card-header h4 {
  margin: 0;
  color: #4CAF50;
  font-size: 1.125rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.timeline-content .timeline-card .timeline-card-header h4::before {
  content: "📅";
  font-size: 1rem;
}
.timeline-content .timeline-card .timeline-card-body {
  padding: 1rem 1.25rem;
  overflow-y: auto;
}
.timeline-content .timeline-card .timeline-card-body p {
  margin: 0 0 0.75rem 0;
  color: #000000;
  line-height: 1.625;
}
.timeline-content .timeline-card .timeline-card-body p:last-child {
  margin-bottom: 0;
}

.web-versions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.version-card {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  border: 2px solid transparent;
  border-radius: 0.9375rem;
  overflow: hidden;
  transition: all 0.3s ease;
  position: relative;
}
.version-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  transition: background 0.3s ease;
}
.version-card.web1 {
  border-color: #e74c3c;
}
.version-card.web1::before {
  background: #e74c3c;
}
.version-card.web1 .version-tag {
  background: #e74c3c;
}
.version-card.web2 {
  border-color: #3498db;
}
.version-card.web2::before {
  background: #3498db;
}
.version-card.web2 .version-tag {
  background: #3498db;
}
.version-card.web3 {
  border-color: #2ecc71;
}
.version-card.web3::before {
  background: #2ecc71;
}
.version-card.web3 .version-tag {
  background: #2ecc71;
}
.version-card.web4 {
  border-color: #9b59b6;
}
.version-card.web4::before {
  background: #9b59b6;
}
.version-card.web4 .version-tag {
  background: #9b59b6;
}
.version-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 25px rgba(0, 0, 0, 0.1);
}

.version-header {
  padding: 1.25rem 1.25rem 1rem;
}
.version-header h3 {
  margin-bottom: 0.75rem;
  color: #000000;
  font-size: 1.125rem;
}

.version-tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  color: white;
  border-radius: 0.25rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  white-space: nowrap;
  letter-spacing: 0.5px;
}

.version-content {
  padding: 0 1.25rem 1.25rem;
}
.version-content p {
  font-weight: 500;
  margin-bottom: 0.75rem;
  color: #000000;
}
.version-content ul {
  margin-bottom: 1rem;
  padding-left: 1.25rem;
}
.version-content ul li {
  margin-bottom: 0.5rem;
  color: #000000;
  position: relative;
}
.version-content ul li::before {
  content: "•";
  color: inherit;
  font-weight: bold;
  position: absolute;
  left: -1rem;
}

.version-example {
  background: #e9ecef;
  padding: 1rem;
  border-radius: 0.5rem;
  border-left: 3px solid currentColor;
  font-size: 0.875rem;
}
.version-example strong {
  color: #000000;
}

.browser-simulator {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  background: white;
  border: 1px solid #e9ecef;
  border-radius: 0.625rem;
  overflow: hidden;
  margin: 1.25rem 0;
  position: relative;
  z-index: 1;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
  height: 0;
  opacity: 0;
  transform: scaleY(0);
  transform-origin: top;
}
.browser-simulator:hover {
  box-shadow: 0 20px 25px rgba(0, 0, 0, 0.1);
  transform: scaleY(0);
}
.browser-simulator.visible {
  height: auto;
  opacity: 1;
  transform: scaleY(1);
}
.browser-simulator .browser-header {
  background: linear-gradient(135deg, #fafafa, #f0f0f0);
  padding: 1rem 1.25rem;
  border-bottom: 1px solid #e9ecef;
  display: flex;
  align-items: center;
  justify-content: center;
  justify-content: flex-start;
  gap: 1rem;
  position: relative;
  z-index: 2;
}
.browser-simulator .browser-header::before {
  content: "";
  width: 12px;
  height: 12px;
  background: #ff5f57;
  border-radius: 50%;
  box-shadow: 20px 0 0 #ffbd2e, 40px 0 0 #28ca42;
  flex-shrink: 0;
}
.browser-simulator .browser-title {
  font-size: 0.875rem;
  color: #000000;
  font-weight: 500;
  margin-left: 1.25rem;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  background: rgba(255, 255, 255, 0.8);
  padding: 0.25rem 0.75rem;
  border-radius: 0.25rem;
  display: inline-block;
}
.browser-simulator .browser-content {
  padding: 1.5rem;
  font-family: "Times New Roman", serif;
  line-height: 1.625;
  background: white;
  position: relative;
  z-index: 1;
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transition: all 0.3s ease;
}
.browser-simulator .browser-content.visible {
  opacity: 1;
  max-height: 500px;
  overflow-y: auto;
}
.browser-simulator .browser-content h4 {
  color: #4CAF50;
  margin-bottom: 1rem;
  font-size: 1.125rem;
  font-weight: 700;
}
.browser-simulator .browser-content p {
  margin-bottom: 1rem;
  color: #000000;
}
.browser-simulator .browser-content p:last-child {
  margin-bottom: 0;
}
.browser-simulator .browser-content a {
  color: #4CAF50;
  text-decoration: none;
  font-weight: 500;
  border-bottom: 1px solid transparent;
  transition: all 0.15s ease;
}
.browser-simulator .browser-content a:hover {
  border-bottom-color: #4CAF50;
  color: #45a049;
}

.browser-content {
  padding: 1.25rem;
  min-height: 240px;
  background: linear-gradient(135deg, #fafafa, #f0f0f0);
  font-family: "Times New Roman", serif;
  font-size: 0.875rem;
  line-height: 1.625;
}
.browser-content h4 {
  color: #000080;
  font-weight: bold;
  margin-bottom: 0.75rem;
  text-decoration: underline;
}
.browser-content a {
  color: #0000EE;
  text-decoration: underline;
  cursor: pointer;
  transition: color 0.15s ease;
}
.browser-content a:hover {
  color: #FF00FF;
  background: rgba(255, 255, 0, 0.2);
}
.browser-content a:visited {
  color: #551A8B;
}
.browser-content p {
  margin-bottom: 1rem;
  text-align: justify;
}

.search-simulator {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  padding: 2rem;
  margin: 2rem 0;
  border: 2px solid #17a2b8;
  background: linear-gradient(135deg, rgba(23, 162, 184, 0.02), rgba(23, 162, 184, 0.05));
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  position: relative;
}
.search-simulator::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(135deg, #4CAF50, #45a049);
  border-radius: 0.9375rem 0.9375rem 0 0;
}
.search-simulator h4 {
  color: #17a2b8;
  margin-bottom: 1.5rem;
  text-align: center;
  font-size: 1.25rem;
  font-weight: 700;
}
.search-simulator h4 i {
  margin-right: 0.75rem;
  font-size: 1.125rem;
  animation: pulse 2s infinite;
}

.search-interface {
  max-width: 700px;
  margin: 0 auto;
}

.search-box {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 2rem;
  position: relative;
}
.search-box::before {
  content: "";
  position: absolute;
  top: -5px;
  left: -5px;
  right: -5px;
  bottom: -5px;
  background: linear-gradient(135deg, #4CAF50, #45a049);
  border-radius: 0.9375rem;
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: -1;
}
.search-box:focus-within::before {
  opacity: 0.1;
}
.search-box input {
  flex: 1;
  padding: 1.25rem 1rem;
  border: 2px solid #e9ecef;
  border-radius: 0.9375rem;
  font-size: 1.125rem;
  background: white;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
  transition: all 0.3s ease;
}
.search-box input::placeholder {
  color: #495057;
  font-style: italic;
}
.search-box input:focus {
  outline: none;
  border-color: #17a2b8;
  box-shadow: 0 0 0 4px rgba(23, 162, 184, 0.1), 0 4px 6px rgba(0, 0, 0, 0.1);
  transform: translateY(-1px);
}
.search-box button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.search-box button:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.search-box button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.search-box button {
  background: linear-gradient(135deg, #4CAF50, #45a049);
  color: white;
}
.search-box button:hover:not(:disabled) {
  background: linear-gradient(135deg, #45a049, #3d8b40);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
}
.search-box button:active:not(:disabled) {
  transform: translateY(0);
}
.search-box button {
  background: #17a2b8;
  border-color: #17a2b8;
  padding: 1.25rem 1.5rem;
  border-radius: 0.9375rem;
  font-size: 1.125rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
  transition: all 0.3s ease;
}
.search-box button:hover {
  background: rgb(20.7, 145.8, 165.6);
  transform: translateY(-1px);
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}
.search-box button:active {
  transform: translateY(0);
}
.search-box button i {
  font-size: 1rem;
}

.search-results .result-item {
  background: white;
  padding: 1.5rem;
  border: 1px solid #e9ecef;
  border-radius: 0.625rem;
  margin-bottom: 1.25rem;
  transition: all 0.3s ease;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
  position: relative;
}
.search-results .result-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: #17a2b8;
  border-radius: 0.25rem;
  opacity: 0;
  transition: opacity 0.3s ease;
}
.search-results .result-item:hover {
  border-color: #17a2b8;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}
.search-results .result-item:hover::before {
  opacity: 1;
}
.search-results .result-item h4 {
  margin-bottom: 0.75rem;
  font-size: 1.125rem;
}
.search-results .result-item h4 a {
  color: #17a2b8;
  text-decoration: none;
  font-weight: 600;
  transition: color 0.15s ease;
}
.search-results .result-item h4 a:hover {
  text-decoration: underline;
  color: rgb(19.55, 137.7, 156.4);
}
.search-results .result-item p {
  color: #000000;
  margin-bottom: 1rem;
  line-height: 1.625;
  font-size: 1rem;
}
.search-results .result-item cite {
  color: #28a745;
  font-size: 0.875rem;
  font-style: normal;
  font-weight: 500;
  background: rgba(40, 167, 69, 0.1);
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  display: inline-block;
}

.comparison-table {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  border: 1px solid #e9ecef;
  border-radius: 0.625rem;
  overflow: hidden;
  margin: 2rem 0;
}

.comparison-header {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: linear-gradient(135deg, #4CAF50, #45a049);
  color: white;
}
.comparison-header .comparison-title {
  padding: 1.25rem;
  text-align: center;
  font-weight: 700;
  font-size: 1.125rem;
  border-right: 1px solid rgba(255, 255, 255, 0.2);
}
.comparison-header .comparison-title:last-child {
  border-right: none;
}
.comparison-header .comparison-vs {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem 1rem;
  background: rgba(255, 255, 255, 0.2);
  font-weight: 700;
  font-size: 1.25rem;
}

.comparison-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
}
.comparison-row:nth-child(even) {
  background: #e9ecef;
}
.comparison-row .comparison-item, .comparison-row .comparison-cell {
  padding: 1.25rem;
  border-right: 1px solid #e9ecef;
}
.comparison-row .comparison-item:last-child, .comparison-row .comparison-cell:last-child {
  border-right: none;
}
.comparison-row .comparison-item h4, .comparison-row .comparison-cell h4 {
  color: #4CAF50;
  margin-bottom: 0.75rem;
  font-size: 1rem;
  font-weight: 600;
}
.comparison-row .comparison-item p, .comparison-row .comparison-cell p {
  margin: 0;
  color: #000000;
  line-height: 1.625;
}
.comparison-row .comparison-divider {
  width: 1px;
  background: #e9ecef;
}

.quiz-next {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.quiz-next:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.quiz-next:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.quiz-next {
  background: linear-gradient(135deg, #4CAF50, #45a049);
  color: white;
}
.quiz-next:hover:not(:disabled) {
  background: linear-gradient(135deg, #45a049, #3d8b40);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
}
.quiz-next:active:not(:disabled) {
  transform: translateY(0);
}
.quiz-next {
  margin-top: 1.25rem;
  padding: 1rem 1.5rem;
  font-size: 1rem;
  border-radius: 0.625rem;
}
.quiz-next:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.quiz-feedback {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: 0.5rem;
  text-align: center;
  font-weight: 500;
}
.quiz-feedback.correct {
  background: rgba(40, 167, 69, 0.1);
  color: #28a745;
  border: 1px solid rgba(40, 167, 69, 0.3);
}
.quiz-feedback.incorrect {
  background: rgba(220, 53, 69, 0.1);
  color: #dc3545;
  border: 1px solid rgba(220, 53, 69, 0.3);
}

.quiz-results {
  text-align: center;
  padding: 2rem;
}
.quiz-results h3 {
  color: #4CAF50;
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
}

.score-display {
  margin-bottom: 2rem;
}

.score-circle {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: linear-gradient(135deg, #4CAF50, #45a049);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem;
}
.score-circle span {
  color: white;
  font-size: 1.5rem;
  font-weight: 700;
}

.results-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}
@media (max-width: 576px) {
  .results-actions {
    flex-direction: column;
  }
}
.results-actions button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.results-actions button:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.results-actions button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.results-actions button {
  background: transparent;
  color: #4CAF50;
  border: 2px solid #4CAF50;
}
.results-actions button:hover:not(:disabled) {
  background: #4CAF50;
  color: white;
  transform: translateY(-2px);
}
.results-actions button {
  padding: 1rem 1.5rem;
}
.results-actions button:first-child {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.results-actions button:first-child:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.results-actions button:first-child:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.results-actions button:first-child {
  background: #f8f9fa;
  color: #000000;
  border: 2px solid #e9ecef;
}
.results-actions button:first-child:hover:not(:disabled) {
  background: #e9ecef;
  border-color: #4CAF50;
  transform: translateY(-2px);
}
.results-actions button:last-child {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.results-actions button:last-child:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.results-actions button:last-child:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.results-actions button:last-child {
  background: linear-gradient(135deg, #4CAF50, #45a049);
  color: white;
}
.results-actions button:last-child:hover:not(:disabled) {
  background: linear-gradient(135deg, #45a049, #3d8b40);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
}
.results-actions button:last-child:active:not(:disabled) {
  transform: translateY(0);
}

.timeline-container {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding: 1.5rem 0;
}

.timeline-line {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(to bottom, #4CAF50, #2196F3);
  transform: translateX(-50%);
  border-radius: 50%;
  box-shadow: 0 0 10px rgba(76, 175, 80, 0.3);
}
@media (max-width: 768px) {
  .timeline-line {
    left: 30px;
  }
}
@media (max-width: 576px) {
  .timeline-line {
    left: 20px;
  }
}

.timeline-events {
  position: relative;
}

.timeline-event {
  position: relative;
  margin-bottom: 2.5rem;
  opacity: 0;
  animation: fadeInUp 0.8s ease-out forwards;
}
.timeline-event:nth-child(1) {
  animation-delay: 0.2s;
}
.timeline-event:nth-child(2) {
  animation-delay: 0.4s;
}
.timeline-event:nth-child(3) {
  animation-delay: 0.6s;
}
.timeline-event:nth-child(4) {
  animation-delay: 0.8s;
}
.timeline-event:nth-child(5) {
  animation-delay: 1s;
}
.timeline-event:nth-child(6) {
  animation-delay: 1.2s;
}
.timeline-event:nth-child(7) {
  animation-delay: 1.4s;
}
.timeline-event:nth-child(8) {
  animation-delay: 1.6s;
}
.timeline-event:nth-child(9) {
  animation-delay: 1.8s;
}
.timeline-event:nth-child(10) {
  animation-delay: 2s;
}
.timeline-event.left .timeline-content {
  text-align: right;
  margin-right: 2rem;
}
@media (max-width: 768px) {
  .timeline-event.left .timeline-content {
    text-align: left;
    margin-right: 0;
    margin-left: 2.5rem;
  }
}
.timeline-event.right .timeline-content {
  margin-left: 2rem;
}
@media (max-width: 768px) {
  .timeline-event.right .timeline-content {
    margin-left: 2.5rem;
  }
}
@media (max-width: 768px) {
  .timeline-event.left .timeline-content, .timeline-event.right .timeline-content {
    margin-left: 2.5rem;
    text-align: left;
  }
}

.timeline-dot {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 20px;
  height: 20px;
  background: #4CAF50;
  border: 4px solid white;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  z-index: 2;
  transition: all 0.3s ease;
}
@media (max-width: 768px) {
  .timeline-dot {
    left: 30px;
  }
}
@media (max-width: 576px) {
  .timeline-dot {
    left: 20px;
    width: 16px;
    height: 16px;
    border-width: 3px;
  }
}
.timeline-dot:hover {
  transform: translate(-50%, -50%) scale(1.2);
  box-shadow: 0 0 20px rgba(76, 175, 80, 0.6);
}

.timeline-content {
  position: relative;
}

.event-year {
  display: inline-block;
  background: #4CAF50;
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 50%;
  font-weight: 700;
  font-size: 1.125rem;
  margin-bottom: 1rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
@media (max-width: 576px) {
  .event-year {
    font-size: 1rem;
    padding: 0.25rem 0.75rem;
  }
}

.event-card {
  background: white;
  padding: 1.25rem;
  border-radius: 0.625rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  border: 2px solid rgba(76, 175, 80, 0.1);
  transition: all 0.3s ease;
  max-width: 350px;
}
@media (max-width: 768px) {
  .event-card {
    max-width: 280px;
  }
}
@media (max-width: 576px) {
  .event-card {
    max-width: 250px;
    padding: 1rem;
  }
}
.event-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 25px rgba(0, 0, 0, 0.1);
  border-color: rgba(76, 175, 80, 0.3);
}
.event-card h4 {
  color: #4CAF50;
  margin-bottom: 0.75rem;
  font-size: 1.125rem;
  font-weight: 600;
}
@media (max-width: 576px) {
  .event-card h4 {
    font-size: 1rem;
  }
}
.event-card p {
  color: #000000;
  margin: 0;
  font-size: 1rem;
  line-height: 1.625;
}
@media (max-width: 576px) {
  .event-card p {
    font-size: 0.875rem;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.timeline-details {
  background: white;
  padding: 1.5rem;
  border-radius: 0.625rem;
  border: 1px solid #e9ecef;
  margin-top: 2rem;
  text-align: center;
}
.timeline-details h4 {
  color: #4CAF50;
  margin-bottom: 1rem;
  font-size: 1.125rem;
  font-weight: 600;
}
.timeline-details p {
  color: #000000;
  margin: 0;
  font-size: 1rem;
  line-height: 1.625;
}

.timeline-details {
  background: white;
  padding: 1.5rem;
  border-radius: 0.625rem;
  border: 1px solid #e9ecef;
  margin-top: 2rem;
  text-align: center;
}
.timeline-details h4 {
  color: #4CAF50;
  margin-bottom: 1rem;
  font-size: 1.125rem;
  font-weight: 600;
}
.timeline-details p {
  color: #000000;
  margin: 0;
  font-size: 1rem;
  line-height: 1.625;
}

.image-container {
  margin: 1.5rem 0;
  text-align: center;
}
.image-container img {
  max-width: 100%;
  height: auto;
  border-radius: 0.625rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  border: 1px solid #e9ecef;
}

.image-caption {
  margin-top: 0.75rem;
  font-size: 0.875rem;
  color: #000000;
  font-style: italic;
  text-align: center;
  line-height: 1.5;
}

.concept-diagram {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  padding: 1.5rem;
  margin: 2rem 0;
  background: linear-gradient(135deg, rgba(76, 175, 80, 0.05), rgba(33, 150, 243, 0.05));
  border: 1px solid rgba(76, 175, 80, 0.2);
}
.concept-diagram h3 {
  color: #4CAF50;
  text-align: center;
  margin-bottom: 1.25rem;
  font-size: 1.25rem;
}

.architecture-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  justify-content: space-between;
  gap: 1.5rem;
}
@media (max-width: 768px) {
  .architecture-visual {
    flex-direction: column;
    gap: 1rem;
  }
}

.arch-component {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  padding: 1.25rem;
  background: white;
  border-radius: 0.625rem;
  border: 2px solid #e9ecef;
  text-align: center;
  min-width: 150px;
  transition: all 0.3s ease;
}
.arch-component:hover {
  border-color: #4CAF50;
  transform: translateY(-5px);
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}
.arch-component.client {
  border-color: rgba(76, 175, 80, 0.5);
  background: rgba(76, 175, 80, 0.05);
}
.arch-component.server {
  border-color: rgba(33, 150, 243, 0.5);
  background: rgba(33, 150, 243, 0.05);
}
.arch-component i {
  font-size: 1.875rem;
  margin-bottom: 0.75rem;
  color: #4CAF50;
}
.arch-component span {
  font-weight: 600;
  color: #000000;
  font-size: 1rem;
}

.arch-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  color: #000000;
  font-size: 0.875rem;
}
@media (max-width: 768px) {
  .arch-arrow {
    transform: rotate(90deg);
  }
}
.arch-arrow i {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: #4CAF50;
}
.arch-arrow span {
  font-weight: 500;
  text-align: center;
}

.hierarchy-diagram {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  padding: 1.5rem;
  margin: 2rem 0;
  background: linear-gradient(135deg, rgba(76, 175, 80, 0.05), rgba(33, 150, 243, 0.05));
  border: 1px solid rgba(76, 175, 80, 0.2);
  position: relative;
  overflow: visible;
}
.hierarchy-diagram::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #4CAF50, #2196F3, #FF9800, #9C27B0);
  border-radius: 0.625rem 0.625rem 0 0;
}

.hierarchy-level {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 2rem;
  position: relative;
}
.hierarchy-level:not(:last-child)::after {
  content: "";
  position: absolute;
  bottom: -1.25rem;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: 2rem;
  background: linear-gradient(to bottom, rgba(76, 175, 80, 0.4), rgba(33, 150, 243, 0.4), rgba(255, 152, 0, 0.4), rgba(156, 39, 176, 0.4));
  border-radius: 1px;
  animation: pulse-connector 3s ease-in-out infinite;
}

.hierarchy-node {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  padding: 1rem 1.25rem;
  background: white;
  border-radius: 0.625rem;
  border: 2px solid #e9ecef;
  text-align: center;
  min-width: 120px;
  max-width: 160px;
  transition: all 0.15s ease;
  position: relative;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
  cursor: pointer;
}
.hierarchy-node:hover {
  border-color: #4CAF50;
  transform: translateY(-5px) scale(1.02);
  box-shadow: 0 8px 25px rgba(76, 175, 80, 0.15);
  z-index: 10;
}
.hierarchy-node:hover i {
  transform: scale(1.15) rotate(5deg);
  color: #45a049;
}
.hierarchy-node:hover span {
  color: #45a049;
  font-weight: 700;
}
.hierarchy-node:active {
  transform: translateY(-2px) scale(0.98);
}
.hierarchy-node i {
  font-size: 1.875rem;
  margin-bottom: 0.5rem;
  color: #4CAF50;
  transition: all 0.15s ease;
  display: block;
}
.hierarchy-node span {
  font-weight: 600;
  color: #000000;
  font-size: 0.875rem;
  line-height: 1.3;
  transition: all 0.15s ease;
  word-break: break-word;
}
.hierarchy-node::after {
  content: "";
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: linear-gradient(45deg, transparent, rgba(76, 175, 80, 0.1), transparent);
  border-radius: inherit;
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: -1;
}
.hierarchy-node:hover::after {
  opacity: 1;
}

.hierarchy-level:nth-child(1) .hierarchy-node {
  border-color: rgba(76, 175, 80, 0.6);
  background: linear-gradient(135deg, rgba(76, 175, 80, 0.08), rgba(76, 175, 80, 0.03));
}
.hierarchy-level:nth-child(1) .hierarchy-node i {
  color: #4CAF50;
}
.hierarchy-level:nth-child(1) .hierarchy-node:hover {
  border-color: #4CAF50;
  background: linear-gradient(135deg, rgba(76, 175, 80, 0.15), rgba(76, 175, 80, 0.08));
}

.hierarchy-level:nth-child(2) .hierarchy-node {
  border-color: rgba(33, 150, 243, 0.6);
  background: linear-gradient(135deg, rgba(33, 150, 243, 0.08), rgba(33, 150, 243, 0.03));
}
.hierarchy-level:nth-child(2) .hierarchy-node i {
  color: #2196F3;
}
.hierarchy-level:nth-child(2) .hierarchy-node:hover {
  border-color: #2196F3;
  background: linear-gradient(135deg, rgba(33, 150, 243, 0.15), rgba(33, 150, 243, 0.08));
}

.hierarchy-level:nth-child(3) .hierarchy-node {
  border-color: rgba(255, 152, 0, 0.6);
  background: linear-gradient(135deg, rgba(255, 152, 0, 0.08), rgba(255, 152, 0, 0.03));
}
.hierarchy-level:nth-child(3) .hierarchy-node i {
  color: #FF9800;
}
.hierarchy-level:nth-child(3) .hierarchy-node:hover {
  border-color: #FF9800;
  background: linear-gradient(135deg, rgba(255, 152, 0, 0.15), rgba(255, 152, 0, 0.08));
}

.hierarchy-level:nth-child(4) .hierarchy-node {
  border-color: rgba(156, 39, 176, 0.6);
  background: linear-gradient(135deg, rgba(156, 39, 176, 0.08), rgba(156, 39, 176, 0.03));
}
.hierarchy-level:nth-child(4) .hierarchy-node i {
  color: #9C27B0;
}
.hierarchy-level:nth-child(4) .hierarchy-node:hover {
  border-color: #9C27B0;
  background: linear-gradient(135deg, rgba(156, 39, 176, 0.15), rgba(156, 39, 176, 0.08));
}

@keyframes pulse-connector {
  0%, 100% {
    opacity: 0.6;
    transform: translateX(-50%) scaleY(1);
  }
  50% {
    opacity: 1;
    transform: translateX(-50%) scaleY(1.2);
  }
}
@media (max-width: 768px) {
  .hierarchy-level {
    flex-direction: column;
    gap: 0.75rem;
  }
  .hierarchy-level:not(:last-child)::after {
    width: 100%;
    height: 2px;
    left: 0;
    transform: none;
    bottom: -0.75rem;
  }
  .hierarchy-level::before {
    top: -20px;
    left: 20px;
    transform: none;
  }
  .hierarchy-node {
    min-width: 100px;
    max-width: 200px;
    padding: 0.75rem 1rem;
  }
  .hierarchy-node:hover {
    transform: translateY(-3px) scale(1.01);
  }
  .hierarchy-diagram {
    padding: 1.25rem;
  }
}
@media (max-width: 576px) {
  .hierarchy-node {
    min-width: 80px;
    padding: 0.5rem 0.75rem;
  }
  .hierarchy-node i {
    font-size: 1.5rem;
  }
  .hierarchy-node span {
    font-size: 0.75rem;
  }
  .hierarchy-level {
    gap: 0.5rem;
    margin-bottom: 1.5rem;
  }
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
  margin: 2rem 0;
}

.feature-card {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  padding: 1.5rem;
  text-align: center;
  border: 1px solid #e9ecef;
  background: white;
  transition: all 0.3s ease;
}
.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 25px rgba(0, 0, 0, 0.1);
  border-color: #4CAF50;
}
.feature-card:hover i {
  transform: scale(1.1);
  color: #45a049;
}
.feature-card i {
  font-size: 1.875rem;
  color: #4CAF50;
  margin-bottom: 1rem;
  transition: all 0.3s ease;
}
.feature-card h4 {
  color: #000000;
  margin-bottom: 0.75rem;
  font-size: 1.125rem;
  font-weight: 600;
}
.feature-card p {
  color: #000000;
  margin: 0;
  line-height: 1.625;
}
.feature-card:has(.code-example) {
  grid-column: 1/-1;
  max-width: 100%;
  text-align: left;
}
.feature-card:has(.code-example) .card-body {
  text-align: left;
  align-items: flex-start;
}

.examples-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.25rem;
  margin: 2rem 0;
}

.example-card {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  padding: 1.25rem;
  border: 1px solid #e9ecef;
  background: white;
  transition: all 0.3s ease;
}
.example-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 25px rgba(0, 0, 0, 0.1);
  border-color: #4CAF50;
}
.example-card:hover .example-icon {
  transform: scale(1.1);
  color: #45a049;
}
.example-card .example-icon {
  font-size: 1.5rem;
  color: #4CAF50;
  margin-bottom: 1rem;
  transition: all 0.3s ease;
}
.example-card h4 {
  color: #000000;
  margin-bottom: 0.75rem;
  font-size: 1.125rem;
  font-weight: 600;
}
.example-card p {
  color: #000000;
  margin: 0 0 0.75rem 0;
  line-height: 1.625;
}

.code-editor-container {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  background: white;
  border: 1px solid #e9ecef;
  border-radius: 0.625rem;
  overflow: hidden;
  margin: 1.25rem 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
}
@media (max-width: 768px) {
  .code-editor-container {
    grid-template-columns: 1fr;
  }
}

.code-editor {
  background: #1e1e1e;
  color: white;
}
.code-editor .editor-header {
  background: #2d2d30;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #3e3e42;
}
.code-editor .editor-header span {
  font-size: 0.875rem;
  color: #cccccc;
  font-weight: 500;
}
.code-editor textarea {
  width: 100%;
  height: 300px;
  background: transparent;
  color: white;
  border: none;
  padding: 1rem;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
  line-height: 1.5;
  resize: none;
  outline: none;
}

.output-preview {
  background: white;
}
.output-preview .preview-header {
  background: #f8f9fa;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid #e9ecef;
  font-size: 0.875rem;
  color: #000000;
  font-weight: 500;
}
.output-preview iframe {
  width: 100%;
  height: 300px;
  border: none;
  background: white;
}

.web-versions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.version-card {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  background: white;
  border: 1px solid #e9ecef;
  border-radius: 0.625rem;
  overflow: hidden;
  transition: all 0.3s ease;
}
.version-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 25px rgba(0, 0, 0, 0.1);
  border-color: #4CAF50;
}
.version-card.web1 {
  border-top: 4px solid #8b5cf6;
}
.version-card.web1 .version-tag {
  background: #8b5cf6;
}
.version-card.web2 {
  border-top: 4px solid #10b981;
}
.version-card.web2 .version-tag {
  background: #10b981;
}
.version-card.web3 {
  border-top: 4px solid #f59e0b;
}
.version-card.web3 .version-tag {
  background: #f59e0b;
}
.version-card.web4 {
  border-top: 4px solid #ef4444;
}
.version-card.web4 .version-tag {
  background: #ef4444;
}

.version-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  align-items: flex-start;
  padding: 1.25rem;
  padding-bottom: 1rem;
}
.version-header h3 {
  color: #000000;
  margin: 0;
  font-size: 1.125rem;
  font-weight: 700;
}

.version-content {
  padding: 0 1.25rem 1.25rem;
}
.version-content p {
  color: #000000;
  font-weight: 600;
  margin-bottom: 0.75rem;
}
.version-content ul {
  margin-bottom: 1.25rem;
  padding-left: 1rem;
}
.version-content ul li {
  color: #000000;
  margin-bottom: 0.5rem;
  line-height: 1.625;
}

.version-example {
  background: rgba(76, 175, 80, 0.05);
  padding: 1rem;
  border-radius: 0.5rem;
  border-left: 3px solid #4CAF50;
}
.version-example strong {
  color: #4CAF50;
  font-weight: 600;
}
.version-example > :not(strong) {
  color: #000000;
  margin: 0;
}

.quiz-game {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  background: white;
  padding: 1.5rem;
  border: 1px solid #e9ecef;
  border-radius: 0.625rem;
  margin: 1.25rem 0;
}

.game-question p {
  font-size: 1.125rem;
  color: #000000;
  margin-bottom: 1.5rem;
  text-align: center;
  font-weight: 500;
}

.game-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  margin-bottom: 1.25rem;
}
.game-options button {
  padding: 1rem;
  background: white;
  border: 2px solid #e9ecef;
  border-radius: 0.5rem;
  color: #000000;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
}
.game-options button:hover {
  border-color: #4CAF50;
  background: rgba(76, 175, 80, 0.05);
  transform: translateY(-2px);
}
.game-options button.correct {
  border-color: #28a745;
  background: rgba(40, 167, 69, 0.1);
  color: #28a745;
}
.game-options button.incorrect {
  border-color: #dc3545;
  background: rgba(220, 53, 69, 0.1);
  color: #dc3545;
}

.game-feedback {
  text-align: center;
  font-weight: 500;
  padding: 1rem;
  border-radius: 0.5rem;
  margin-top: 1rem;
}
.game-feedback.correct {
  background: rgba(40, 167, 69, 0.1);
  color: #28a745;
  border: 1px solid rgba(40, 167, 69, 0.3);
}
.game-feedback.incorrect {
  background: rgba(220, 53, 69, 0.1);
  color: #dc3545;
  border: 1px solid rgba(220, 53, 69, 0.3);
}

.search-timeline {
  margin: 2rem 0;
}

.search-era {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  background: white;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border: 1px solid #e9ecef;
  border-radius: 0.625rem;
}
.search-era h4 {
  color: #4CAF50;
  margin-bottom: 1.25rem;
  font-size: 1.125rem;
  font-weight: 700;
  text-align: center;
}

.search-engines {
  display: flex;
  align-items: center;
  justify-content: center;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.search-engine {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1rem;
  border: 1px solid #e9ecef;
  border-radius: 0.625rem;
  background: white;
  transition: all 0.3s ease;
  min-width: 120px;
}
.search-engine:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 25px rgba(0, 0, 0, 0.1);
  border-color: #4CAF50;
}
.search-engine.dominant {
  border-color: #4CAF50;
  background: rgba(76, 175, 80, 0.05);
}
.search-engine.dominant span {
  color: #4CAF50;
  font-weight: 700;
}
.search-engine img {
  width: 48px;
  height: 48px;
  border-radius: 0.25rem;
}
.search-engine span {
  font-size: 0.875rem;
  color: #000000;
  font-weight: 500;
  text-align: center;
}

.search-simulator {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  background: white;
  padding: 1.5rem;
  border: 1px solid #e9ecef;
  border-radius: 0.625rem;
  margin: 1.25rem 0;
}
.search-simulator h4 {
  color: #4CAF50;
  margin-bottom: 1.25rem;
  font-size: 1.125rem;
}
.search-simulator h4 i {
  margin-right: 0.5rem;
}

.search-interface {
  background: #f8f9fa;
  padding: 1.5rem;
  border-radius: 0.5rem;
  border: 1px solid #e9ecef;
}

.search-box {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}
.search-box input[type=text] {
  flex: 1;
  padding: 1rem;
  border: 2px solid #e9ecef;
  border-radius: 0.5rem;
  font-size: 1rem;
}
.search-box input[type=text]:focus {
  outline: none;
  border-color: #4CAF50;
}
.search-box button {
  padding: 1rem;
  background: #4CAF50;
  color: white;
  border: none;
  border-radius: 0.5rem;
  cursor: pointer;
  font-size: 1rem;
  transition: all 0.3s ease;
}
.search-box button:hover {
  background: #45a049;
}
.search-box button i {
  font-size: 1rem;
}

.search-results .result-item {
  background: white;
  padding: 1.25rem;
  border: 1px solid #e9ecef;
  border-radius: 0.5rem;
  margin-bottom: 1rem;
}
.search-results .result-item:last-child {
  margin-bottom: 0;
}
.search-results .result-item h4 {
  margin-bottom: 0.75rem;
}
.search-results .result-item h4 a {
  color: #1a0dab;
  text-decoration: none;
  font-size: 1.125rem;
}
.search-results .result-item h4 a:hover {
  text-decoration: underline;
}
.search-results .result-item p {
  color: #000000;
  margin-bottom: 0.75rem;
  line-height: 1.625;
}
.search-results .result-item cite {
  color: #006621;
  font-size: 0.875rem;
  font-style: normal;
}

.demo-tabs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  border-bottom: 2px solid #e9ecef;
}

.demo-container {
  position: relative;
  z-index: 1;
  background: white;
  padding: 1rem;
  border-radius: 0.625rem;
  margin-top: 1rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.mock-browser {
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  transition: all 0.3s ease;
  background: white;
  border: 2px solid #e9ecef;
  border-radius: 0.625rem;
  overflow: hidden;
  position: relative;
  z-index: 1;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}
.mock-browser .browser-bar {
  background: linear-gradient(135deg, #2d3748, #4a5568);
  padding: 1rem 1.25rem;
  border-bottom: 2px solid #e9ecef;
  font-size: 0.875rem;
  color: white;
  font-weight: 700;
  position: relative;
  z-index: 2;
}
.mock-browser .browser-bar::before {
  content: "";
  display: inline-block;
  width: 12px;
  height: 12px;
  background: #ff5f57;
  border-radius: 50%;
  margin-right: 20px;
  box-shadow: 20px 0 0 #ffbd2e, 40px 0 0 #28ca42;
}

.website-content, .webapp-content {
  padding: 1.5rem;
  background: #f8fafc;
  position: relative;
  z-index: 1;
  min-height: 200px;
}
.website-content h3, .webapp-content h3 {
  color: #000000;
  margin-bottom: 1rem;
  font-size: 1.125rem;
  font-weight: 700;
}
.website-content p, .webapp-content p {
  color: #000000;
  margin-bottom: 1.25rem;
  line-height: 1.625;
  font-weight: 500;
}
.website-content button, .webapp-content button {
  display: inline-block;
  padding: 0.75rem 1.25rem;
  margin-right: 0.75rem;
  margin-bottom: 0.75rem;
  background: #2b6cb0;
  color: white;
  border: 3px solid #2b6cb0;
  border-radius: 0.5rem;
  font-weight: 700;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  position: relative;
  z-index: 5;
}
.website-content button:hover, .webapp-content button:hover {
  background: #1a365d;
  border-color: #1a365d;
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(26, 54, 93, 0.4);
  color: white;
}
.website-content button:focus, .webapp-content button:focus {
  outline: 3px solid #ffd700;
  outline-offset: 2px;
}
.website-content button:active, .webapp-content button:active {
  transform: translateY(-1px);
}

.live-updates {
  background: white;
  padding: 1rem;
  border-radius: 0.5rem;
  border: 2px solid #4CAF50;
  margin-bottom: 1.25rem;
  min-height: 100px;
  position: relative;
  z-index: 1;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}
.live-updates p {
  margin: 0;
  color: #000000;
  font-style: normal;
  font-weight: 500;
}

.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.resource-card {
  background: #ffffff;
  border-radius: 0.625rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
  cursor: pointer;
}
.resource-card:hover {
  transform: scale(1.02);
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}
.resource-card .card-icon {
  height: 180px;
  overflow: hidden;
  position: relative;
}
.resource-card .card-icon .resource-preview {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}
.resource-card .card-icon .resource-preview:hover {
  transform: scale(1.05);
}
.resource-card .card-icon .play-overlay, .resource-card .card-icon .docs-overlay {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(0, 0, 0, 0.7);
  border-radius: 50%;
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.25rem;
  transition: all 0.3s ease;
}
.resource-card .card-icon .play-overlay:hover, .resource-card .card-icon .docs-overlay:hover {
  background: rgba(0, 0, 0, 0.9);
  transform: translate(-50%, -50%) scale(1.1);
}
.resource-card .card-content {
  padding: 1rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.resource-card .card-content h4 {
  margin: 0 0 0.5rem 0;
  color: #000000;
  font-size: 1.125rem;
  font-weight: 600;
}
.resource-card .card-content .author {
  color: #4CAF50;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}
.resource-card .card-content .description {
  color: #000000;
  font-size: 0.875rem;
  line-height: 1.5;
  margin-bottom: 1rem;
  flex: 1;
}
.resource-card .card-content .resource-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: auto;
}
.resource-card .card-content .resource-meta .resource-type {
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
}
.resource-card .card-content .resource-meta .resource-type.video {
  background: #ff0000;
  color: white;
}
.resource-card .card-content .resource-meta .resource-type.docs {
  background: #005ce6;
  color: white;
}
.resource-card .card-content .resource-meta .resource-duration {
  color: #495057;
  font-size: 0.75rem;
  font-weight: 500;
}

.video-section {
  margin-bottom: 2rem;
}
.video-section h4 {
  color: #000000;
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 1rem;
}
.video-section iframe {
  width: 100%;
  max-width: 560px;
  height: 315px;
  border: none;
  border-radius: 0.5rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}
.video-section p {
  margin-top: 0.75rem;
  color: #000000;
  font-size: 0.875rem;
}

.links-section h4 {
  color: #000000;
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 1rem;
}
.links-section ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.links-section li {
  margin-bottom: 0.75rem;
}
.links-section a {
  color: #4CAF50;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.15s ease;
}
.links-section a:hover {
  color: #45a049;
  text-decoration: underline;
}

.learning-objectives {
  background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
  border-left: 4px solid #4CAF50;
}
.learning-objectives ul {
  margin: 1rem 0;
  padding-left: 1.25rem;
}
.learning-objectives ul li {
  margin-bottom: 0.75rem;
  position: relative;
}
.learning-objectives ul li::before {
  content: "✓";
  color: #4CAF50;
  font-weight: bold;
  position: absolute;
  left: -1.5rem;
  top: 0;
}

.key-concepts {
  margin: 2rem 0;
}
.key-concepts h3 {
  color: #000000;
  margin-bottom: 1.25rem;
  text-align: center;
}

.concept-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.25rem;
  margin-top: 1.25rem;
}

.concept-item {
  background: #ffffff;
  border-radius: 0.625rem;
  padding: 1.25rem;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border: 2px solid transparent;
}
.concept-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  border-color: #4CAF50;
}
.concept-item .concept-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, #4CAF50 0%, #45a049 100%);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem;
  color: white;
  font-size: 1.25rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
.concept-item h4 {
  color: #000000;
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}
.concept-item p {
  color: #000000;
  font-size: 0.875rem;
  line-height: 1.625;
  margin: 0;
}

.learning-path {
  background: linear-gradient(135deg, #f3e5f5 0%, #e1bee7 100%);
  border-radius: 0.625rem;
  padding: 1.5rem;
  margin: 2rem 0;
  border-left: 4px solid #9c27b0;
}
.learning-path h3 {
  color: #7b1fa2;
  margin-bottom: 1rem;
}
.learning-path p {
  color: #000000;
  line-height: 1.625;
  margin: 0;
}

.content-section.section-read {
  position: relative;
}
.content-section.section-read::after {
  content: "✓ Read";
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: #4CAF50;
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 0.25rem;
  font-size: 0.75rem;
  font-weight: 500;
  opacity: 0.8;
}

.definition-box {
  background: linear-gradient(135deg, #f3e5f5 0%, #e1bee7 100%);
  border: 2px solid #ba68c8;
  border-radius: 0.625rem;
  padding: 1.25rem;
  margin: 1.25rem 0;
  position: relative;
}
.definition-box::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #9c27b0, #ba68c8);
  border-radius: 0.625rem 0.625rem 0 0;
}
.definition-box h3 {
  color: #7b1fa2;
  margin-bottom: 1rem;
  font-size: 1.125rem;
  font-weight: 600;
}
.definition-box h3 i {
  margin-right: 0.5rem;
  color: #9c27b0;
}
.definition-box p {
  color: #000000;
  line-height: 1.625;
  margin: 0;
  font-size: 1rem;
}

.key-terms {
  background: #f8f9fa;
  border: 1px solid #e9ecef;
  border-radius: 0.625rem;
  padding: 1.25rem;
  margin: 1.25rem 0;
}
.key-terms h3 {
  color: #495057;
  margin-bottom: 1rem;
  font-size: 1.125rem;
  font-weight: 600;
}
.key-terms h3 i {
  margin-right: 0.5rem;
  color: #6c757d;
}
.key-terms ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.key-terms ul li {
  padding: 0.75rem 0;
  border-bottom: 1px solid #e9ecef;
}
.key-terms ul li:last-child {
  border-bottom: none;
}
.key-terms ul li strong {
  color: #495057;
  font-weight: 600;
}
.key-terms ul li::before {
  content: "•";
  color: #9c27b0;
  font-weight: bold;
  margin-right: 0.75rem;
}

.step-guide {
  margin: 2rem 0;
  padding: 1.5rem;
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  border: 1px solid #e9ecef;
}
.step-guide h3 {
  color: #000000;
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  text-align: center;
  position: relative;
}
.step-guide h3::after {
  content: "";
  position: absolute;
  bottom: -0.75rem;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: linear-gradient(135deg, #4CAF50, #45a049);
  border-radius: 50%;
}

.step-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 1.5rem;
  position: relative;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  place-items: center;
}
@media (max-width: 992px) {
  .step-container {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 768px) {
  .step-container {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 576px) {
  .step-container {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}

.step {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  min-width: 220px;
  padding: 1.5rem;
  background: #ffffff;
  border-radius: 0.9375rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  border: 2px solid #e9ecef;
  border-bottom: none;
  transition: all 0.3s ease;
  position: relative;
  z-index: 2;
}
.step:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 25px rgba(0, 0, 0, 0.1);
  border-color: #4CAF50;
}
.step:hover .step-number {
  transform: scale(1.1);
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}
@media (max-width: 576px) {
  .step {
    min-width: 180px;
    padding: 1rem;
  }
}

.step-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  background: linear-gradient(135deg, #4CAF50, #45a049);
  color: white;
  border-radius: 50%;
  font-weight: 700;
  font-size: 1.125rem;
  margin-bottom: 1rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
  position: relative;
}
.step-number::before {
  content: "";
  position: absolute;
  inset: -2px;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.2), transparent);
  z-index: -1;
}
@media (max-width: 576px) {
  .step-number {
    width: 2.5rem;
    height: 2.5rem;
    font-size: 1rem;
  }
}

.step-content h4 {
  color: #000000;
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  line-height: 1.25;
}
.step-content p {
  color: #000000;
  font-size: 0.875rem;
  line-height: 1.625;
  margin: 0;
}

.step-arrow {
  font-size: 4rem;
  color: #4CAF50;
  font-weight: 700;
  margin: 0 0.5rem;
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  content: "↓";
  transform: rotate(90deg);
}
@media (max-width: 768px) {
  .step-arrow {
    margin: 0.75rem 0.5rem;
    font-size: 3rem;
  }
}
@media (max-width: 576px) {
  .step-arrow {
    display: flex;
    margin: 0.75rem 0;
    font-size: 2.5rem;
    justify-content: center;
  }
}

@keyframes stepFadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.step {
  animation: stepFadeInUp 0.6s ease-out forwards;
}
.step:nth-child(1) {
  animation-delay: 0.15s;
}
.step:nth-child(2) {
  animation-delay: 0.3s;
}
.step:nth-child(3) {
  animation-delay: 0.45s;
}
.step:nth-child(4) {
  animation-delay: 0.6s;
}

.step-1 {
  border-color: #4CAF50;
}
.step-1 .step-number {
  background: #4CAF50;
}
.step-1:hover {
  border-color: #45a049;
}

.step-2 {
  border-color: #28a745;
}
.step-2 .step-number {
  background: #28a745;
}
.step-2:hover {
  border-color: rgb(36, 150.3, 62.1);
}

.step-3 {
  border-color: #ffc107;
}
.step-3 .step-number {
  background: #ffc107;
}
.step-3:hover {
  border-color: rgb(235.8, 176.85, 0);
}

.step-4 {
  border-color: #17a2b8;
}
.step-4 .step-number {
  background: #17a2b8;
}
.step-4:hover {
  border-color: rgb(20.7, 145.8, 165.6);
}

.step-5 {
  border-color: #2196F3;
}
.step-5 .step-number {
  background: #2196F3;
}
.step-5:hover {
  border-color: rgb(12.7384615385, 136.9384615385, 235.6615384615);
}

.step-6 {
  border-color: #dc3545;
}
.step-6 .step-number {
  background: #dc3545;
}
.step-6:hover {
  border-color: rgb(209.4151898734, 36.2848101266, 52.8721518987);
}

.step-guide .step-container .step .step-number {
  background: linear-gradient(135deg, #4CAF50, #45a049);
  background-size: 200% 200%;
}
.step-guide .step-container .step .step-number:hover {
  background-position: right center;
}

.quiz-progress-container {
  margin-bottom: 1.5rem;
}
.quiz-progress-container .quiz-progress-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
  font-size: 0.875rem;
  color: #000000;
}
.quiz-progress-container .quiz-progress-bar {
  width: 100%;
  height: 8px;
  background: #e9ecef;
  border-radius: 50%;
  overflow: hidden;
}
.quiz-progress-container .quiz-progress-bar .quiz-progress-fill {
  height: 100%;
  background: linear-gradient(135deg, #4CAF50, #45a049);
  border-radius: 50%;
  width: 0%;
  transition: width 0.5s ease;
}

.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1040;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}
.modal-backdrop.show {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: #ffffff;
  border-radius: 0.625rem;
  box-shadow: 0 20px 25px rgba(0, 0, 0, 0.1);
  max-width: 600px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  z-index: 1050;
  transform: scale(0.9) translateY(-20px);
  transition: all 0.3s ease;
}
.modal-backdrop.show .modal {
  transform: scale(1) translateY(0);
}
.modal .modal-header {
  padding: 1.25rem;
  border-bottom: 1px solid #e9ecef;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.modal .modal-header .modal-title {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 600;
  color: #000000;
}
.modal .modal-header .modal-close {
  background: none;
  border: none;
  font-size: 1.25rem;
  color: #000000;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 0.25rem;
  transition: all 0.15s ease;
}
.modal .modal-header .modal-close:hover {
  color: #000000;
  background: #e9ecef;
}
.modal .modal-body {
  padding: 1.25rem;
}
.modal .modal-body .solution-content .solution-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: #4CAF50;
  margin-bottom: 1rem;
}
.modal .modal-body .solution-content .solution-code {
  background: #2c3e50;
  color: #ecf0f1;
  padding: 1rem;
  border-radius: 0.25rem;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
  line-height: 1.5;
  margin-bottom: 1rem;
  overflow-x: auto;
  border: 1px solid #ced4da;
}
.modal .modal-body .solution-content .solution-explanation {
  color: #000000;
  line-height: 1.5;
}
.modal .modal-body .solution-content .solution-explanation p {
  margin-bottom: 0.75rem;
}
.modal .modal-body .solution-content .solution-explanation p:last-child {
  margin-bottom: 0;
}
.modal .modal-footer {
  padding: 1.25rem;
  border-top: 1px solid #e9ecef;
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}
.modal .modal-footer .btn {
  min-width: 100px;
}

.structure-demo {
  margin: 1.5rem 0;
}
.structure-demo .demo-description {
  color: #000000;
  font-size: 1.125rem;
  line-height: 1.625;
  margin-bottom: 1.25rem;
  text-align: center;
}
.structure-demo .demo-controls {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}
.structure-demo .demo-controls .btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  font-weight: 500;
  transition: all 0.3s ease;
}
.structure-demo .demo-controls .btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
@media (max-width: 576px) {
  .structure-demo .demo-controls {
    flex-direction: column;
    align-items: center;
  }
}
.structure-demo .demo-container {
  position: relative;
  background: white;
  border-radius: 0.625rem;
  padding: 1.5rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  margin-bottom: 1.25rem;
}
@media (max-width: 768px) {
  .structure-demo .demo-container {
    padding: 1.25rem;
  }
}
.structure-demo .semantic-page-layout {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 1000px;
  margin: 0 auto;
}
.structure-demo .demo-element {
  position: relative;
  border: 2px solid #e9ecef;
  border-radius: 0.5rem;
  padding: 1rem;
  background: #e9ecef;
  transition: all 0.3s ease;
  cursor: pointer;
}
.structure-demo .demo-element:hover {
  border-color: #4CAF50;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}
.structure-demo .demo-element.highlighted {
  border-color: #28a745;
  background: rgba(40, 167, 69, 0.05);
  box-shadow: 0 0 15px rgba(40, 167, 69, 0.3);
}
.structure-demo .demo-element.landmark-highlighted {
  border-color: #4CAF50;
  background: rgba(76, 175, 80, 0.05);
  box-shadow: 0 0 15px rgba(76, 175, 80, 0.3);
}
.structure-demo .demo-element.element-highlighted {
  border-color: #ffc107;
  background: rgba(255, 193, 7, 0.05);
  box-shadow: 0 0 20px rgba(255, 193, 7, 0.4);
  transform: translateY(-2px) scale(1.02);
}
.structure-demo .demo-element.dimmed {
  opacity: 0.5;
  background: #e9ecef;
}
.structure-demo .demo-element:focus {
  outline: 2px solid #4CAF50;
  outline-offset: 2px;
}
.structure-demo .demo-element .element-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  font-weight: 600;
  color: #000000;
}
.structure-demo .demo-element .element-label .element-name {
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  background: rgba(76, 175, 80, 0.1);
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  color: #4CAF50;
  font-size: 0.875rem;
}
.structure-demo .demo-element .element-label .element-role {
  color: #000000;
  font-size: 0.875rem;
  font-weight: 400;
  margin-left: auto;
}
.structure-demo .demo-element .element-label i {
  color: #4CAF50;
}
.structure-demo .demo-element .element-content {
  color: #000000;
}
.structure-demo .header-section {
  background: linear-gradient(135deg, rgba(76, 175, 80, 0.05), rgba(76, 175, 80, 0.1));
  border-color: rgba(76, 175, 80, 0.3);
}
.structure-demo .header-section .demo-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: #4CAF50;
  margin-bottom: 1rem;
}
.structure-demo .header-section .demo-logo i {
  font-size: 1.5rem;
}
.structure-demo .nav-section {
  background: rgba(23, 162, 184, 0.05);
  border-color: rgba(23, 162, 184, 0.3);
  margin-top: 1rem;
}
.structure-demo .nav-section .nav-items {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.structure-demo .nav-section .nav-items .nav-item {
  padding: 0.5rem 0.75rem;
  background: rgba(23, 162, 184, 0.1);
  border-radius: 0.25rem;
  font-weight: 500;
  color: #17a2b8;
  cursor: pointer;
  transition: all 0.15s ease;
}
.structure-demo .nav-section .nav-items .nav-item:hover {
  background: rgba(23, 162, 184, 0.2);
  transform: translateY(-1px);
}
.structure-demo .main-section {
  background: linear-gradient(135deg, rgba(40, 167, 69, 0.05), rgba(40, 167, 69, 0.1));
  border-color: rgba(40, 167, 69, 0.3);
}
.structure-demo .main-section .main-content-layout {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 1.25rem;
  margin-top: 1rem;
}
@media (max-width: 992px) {
  .structure-demo .main-section .main-content-layout {
    grid-template-columns: 1fr;
  }
}
.structure-demo .article-section {
  background: rgba(255, 193, 7, 0.05);
  border-color: rgba(255, 193, 7, 0.3);
  margin-bottom: 1rem;
}
.structure-demo .article-section .article-header {
  margin-bottom: 0.75rem;
}
.structure-demo .article-section .article-header h3 {
  margin: 0 0 0.5rem 0;
  color: #000000;
  font-size: 1.125rem;
}
.structure-demo .article-section .article-header .article-meta {
  display: flex;
  gap: 0.75rem;
  font-size: 0.875rem;
  color: #000000;
}
.structure-demo .article-section .article-header .article-meta time {
  color: #4CAF50;
}
.structure-demo .article-section .article-excerpt {
  color: #000000;
  line-height: 1.625;
  margin-bottom: 0.75rem;
}
.structure-demo .article-section .article-tags {
  display: flex;
  gap: 0.5rem;
}
.structure-demo .article-section .article-tags .tag {
  padding: 0.25rem 0.5rem;
  background: rgba(255, 193, 7, 0.2);
  border-radius: 0.25rem;
  font-size: 0.75rem;
  color: #ffc107;
  font-weight: 500;
}
.structure-demo .section-group {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.structure-demo .section-group .section-item {
  background: rgba(23, 162, 184, 0.05);
  border-color: rgba(23, 162, 184, 0.3);
}
.structure-demo .section-group .section-item h4 {
  margin: 0 0 0.75rem 0;
  color: #000000;
  font-size: 1rem;
}
.structure-demo .section-group .section-item .service-items {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.structure-demo .section-group .section-item .service-items .service-item {
  padding: 0.5rem 0.75rem;
  background: rgba(23, 162, 184, 0.1);
  border-radius: 0.25rem;
  color: #17a2b8;
  font-weight: 500;
  font-size: 0.875rem;
}
.structure-demo .section-group .section-item blockquote {
  margin: 0;
  padding: 0.75rem;
  background: rgba(23, 162, 184, 0.1);
  border-left: 4px solid #17a2b8;
  border-radius: 0.25rem;
  font-style: italic;
  color: #000000;
}
.structure-demo .aside-section {
  background: rgba(33, 150, 243, 0.05);
  border-color: rgba(33, 150, 243, 0.3);
}
.structure-demo .aside-section .widget {
  margin-bottom: 1rem;
}
.structure-demo .aside-section .widget:last-child {
  margin-bottom: 0;
}
.structure-demo .aside-section .widget h4 {
  margin: 0 0 0.75rem 0;
  color: #000000;
  font-size: 1rem;
  border-bottom: 2px solid rgba(33, 150, 243, 0.2);
  padding-bottom: 0.5rem;
}
.structure-demo .aside-section .widget .recent-posts {
  list-style: none;
  padding: 0;
  margin: 0;
}
.structure-demo .aside-section .widget .recent-posts li {
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(33, 150, 243, 0.1);
  color: #000000;
}
.structure-demo .aside-section .widget .recent-posts li:hover {
  color: #4CAF50;
  cursor: pointer;
}
.structure-demo .aside-section .widget .recent-posts li:last-child {
  border-bottom: none;
}
.structure-demo .aside-section .widget .contact-details p {
  margin: 0.5rem 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: #000000;
}
.structure-demo .aside-section .widget .contact-details p i {
  color: #2196F3;
  width: 20px;
}
.structure-demo .footer-section {
  background: linear-gradient(135deg, rgba(44, 62, 80, 0.05), rgba(44, 62, 80, 0.1));
  border-color: rgba(44, 62, 80, 0.3);
}
.structure-demo .footer-section .footer-columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1rem;
}
.structure-demo .footer-section .footer-columns .footer-column h5 {
  margin: 0 0 0.75rem 0;
  color: #000000;
  font-size: 1rem;
}
.structure-demo .footer-section .footer-columns .footer-column ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.structure-demo .footer-section .footer-columns .footer-column ul li {
  padding: 0.25rem 0;
  color: #000000;
  cursor: pointer;
}
.structure-demo .footer-section .footer-columns .footer-column ul li:hover {
  color: #4CAF50;
}
.structure-demo .footer-section .footer-columns .footer-column .social-links {
  display: flex;
  gap: 0.75rem;
}
.structure-demo .footer-section .footer-columns .footer-column .social-links i {
  font-size: 1.125rem;
  color: #000000;
  cursor: pointer;
  transition: color 0.15s ease;
}
.structure-demo .footer-section .footer-columns .footer-column .social-links i:hover {
  color: #4CAF50;
}
.structure-demo .footer-section .footer-bottom {
  padding-top: 1rem;
  border-top: 1px solid rgba(44, 62, 80, 0.2);
  text-align: center;
}
.structure-demo .footer-section .footer-bottom p {
  margin: 0;
  color: #000000;
  font-size: 0.875rem;
}

.element-info-panel {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 90%;
  max-width: 600px;
  max-height: 80vh;
  background: white;
  border-radius: 0.625rem;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
  z-index: 1000;
  overflow: hidden;
  transition: all 0.3s ease;
}
@media (max-width: 576px) {
  .element-info-panel {
    width: 95%;
    max-height: 90vh;
  }
}
.element-info-panel .info-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem;
  background: #4CAF50;
  color: white;
}
.element-info-panel .info-header h4 {
  margin: 0;
  font-size: 1.125rem;
}
.element-info-panel .info-header .info-close {
  background: none;
  border: none;
  color: white;
  font-size: 1.25rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 0.25rem;
  transition: background 0.15s ease;
}
.element-info-panel .info-header .info-close:hover {
  background: rgba(255, 255, 255, 0.2);
}
.element-info-panel .info-content {
  padding: 1.25rem;
  max-height: calc(80vh - 100px);
  overflow-y: auto;
}
.element-info-panel .info-content .info-section {
  margin-bottom: 1.25rem;
}
.element-info-panel .info-content .info-section:last-child {
  margin-bottom: 0;
}
.element-info-panel .info-content .info-section h5 {
  margin: 0 0 0.75rem 0;
  color: #4CAF50;
  font-size: 1rem;
  font-weight: 600;
}
.element-info-panel .info-content .info-section p {
  margin: 0;
  color: #000000;
  line-height: 1.625;
}
.element-info-panel .info-content .info-section ul {
  margin: 0;
  padding-left: 1rem;
}
.element-info-panel .info-content .info-section ul li {
  margin-bottom: 0.5rem;
  color: #000000;
  line-height: 1.625;
}
.element-info-panel .info-content .info-section pre {
  background: #2c3e50;
  color: #ecf0f1;
  padding: 1rem;
  border-radius: 0.5rem;
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.5;
}
.element-info-panel .info-content .info-section pre code {
  background: none;
  color: inherit;
  padding: 0;
}

.code-structure-panel {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 95%;
  max-width: 900px;
  max-height: 90vh;
  background: white;
  border-radius: 0.625rem;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
  z-index: 1000;
  overflow: hidden;
  transition: all 0.3s ease;
}
.code-structure-panel .code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem;
  background: #2c3e50;
  color: white;
}
.code-structure-panel .code-header h4 {
  margin: 0;
  font-size: 1.125rem;
}
.code-structure-panel .code-header .code-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.code-structure-panel .code-header .code-actions .btn {
  font-size: 0.875rem;
  padding: 0.5rem 0.75rem;
}
.code-structure-panel .code-header .code-actions .code-close {
  background: none;
  border: none;
  color: white;
  font-size: 1.25rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 0.25rem;
  transition: background 0.15s ease;
  margin-left: 0.75rem;
}
.code-structure-panel .code-header .code-actions .code-close:hover {
  background: rgba(255, 255, 255, 0.2);
}
.code-structure-panel .code-content {
  max-height: calc(90vh - 100px);
  overflow-y: auto;
}
.code-structure-panel .code-content pre {
  margin: 0;
  padding: 1.25rem;
  background: #2c3e50;
  color: #ecf0f1;
  font-size: 0.875rem;
  line-height: 1.5;
}
.code-structure-panel .code-content pre code {
  background: none;
  color: inherit;
  padding: 0;
}

.structure-guidelines {
  margin-top: 1.5rem;
  padding: 1.25rem;
  background: #e9ecef;
  border-radius: 0.625rem;
  border: 1px solid #e9ecef;
}
.structure-guidelines .guidelines-title {
  margin: 0 0 1.25rem 0;
  color: #000000;
  font-size: 1.25rem;
  text-align: center;
}
.structure-guidelines .guidelines-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}
.structure-guidelines .guidelines-grid .guideline-item {
  display: flex;
  gap: 0.75rem;
  padding: 1rem;
  background: white;
  border-radius: 0.5rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
  transition: all 0.3s ease;
}
.structure-guidelines .guidelines-grid .guideline-item:hover {
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}
.structure-guidelines .guidelines-grid .guideline-item .guideline-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  background: rgba(76, 175, 80, 0.1);
  border-radius: 50%;
  flex-shrink: 0;
}
.structure-guidelines .guidelines-grid .guideline-item .guideline-icon i {
  color: #4CAF50;
  font-size: 1.125rem;
}
.structure-guidelines .guidelines-grid .guideline-item .guideline-content h5 {
  margin: 0 0 0.5rem 0;
  color: #000000;
  font-size: 1rem;
}
.structure-guidelines .guidelines-grid .guideline-item .guideline-content p {
  margin: 0;
  color: #000000;
  font-size: 0.875rem;
  line-height: 1.625;
}

.element-info-panel::before,
.code-structure-panel::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: -1;
}

@media (max-width: 992px) {
  .structure-demo .demo-container {
    padding: 1rem;
  }
  .structure-demo .semantic-page-layout {
    gap: 0.75rem;
  }
  .structure-demo .demo-element {
    padding: 0.75rem;
  }
  .structure-demo .demo-element .element-label {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }
  .structure-demo .demo-element .element-label .element-role {
    margin-left: 0;
  }
}
@media (max-width: 768px) {
  .element-info-panel .info-header,
  .element-info-panel .code-header,
  .code-structure-panel .info-header,
  .code-structure-panel .code-header {
    padding: 1rem;
  }
  .element-info-panel .info-header h4,
  .element-info-panel .code-header h4,
  .code-structure-panel .info-header h4,
  .code-structure-panel .code-header h4 {
    font-size: 1rem;
  }
  .element-info-panel .info-content,
  .element-info-panel .code-content,
  .code-structure-panel .info-content,
  .code-structure-panel .code-content {
    padding: 1rem;
  }
  .structure-guidelines .guidelines-grid {
    grid-template-columns: 1fr;
  }
}
.accessibility-grid {
  margin-bottom: 1.5rem;
}
.accessibility-grid .grid-title {
  margin: 0 0 1rem 0;
  color: #000000;
  font-size: 1.25rem;
  text-align: center;
}
.accessibility-grid p {
  color: #000000;
  font-size: 1.125rem;
  line-height: 1.625;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.simulation-grid .grid-title {
  margin: 0 0 1rem 0;
  color: #000000;
  font-size: 1.25rem;
  text-align: center;
}
.simulation-grid > p {
  color: #000000;
  font-size: 1rem;
  line-height: 1.625;
  text-align: center;
  margin-bottom: 1.25rem;
}

.simulation-container {
  background: white;
  border-radius: 0.625rem;
  padding: 1.25rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  margin-bottom: 1.5rem;
}
.simulation-container .simulation-controls {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}
@media (max-width: 576px) {
  .simulation-container .simulation-controls {
    flex-direction: column;
    align-items: center;
  }
}
.simulation-container .simulation-controls .btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  font-weight: 500;
  transition: all 0.3s ease;
}
.simulation-container .simulation-controls .btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
.simulation-container .simulation-controls .btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.reader-output-container .output-title {
  margin: 0 0 0.75rem 0;
  color: #000000;
  font-size: 1.125rem;
  font-weight: 600;
}
.reader-output-container .reader-output {
  min-height: 200px;
  max-height: 400px;
  overflow-y: auto;
  padding: 1rem;
  background: #2c3e50;
  color: #ecf0f1;
  border-radius: 0.5rem;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
  line-height: 1.625;
}
.reader-output-container .reader-output.reading {
  border-left: 4px solid #4CAF50;
  animation: pulse 2s infinite;
}
.reader-output-container .reader-output .reader-message {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.reader-output-container .reader-output .reader-message:last-child {
  border-bottom: none;
}
.reader-output-container .reader-output .reader-message i {
  flex-shrink: 0;
  width: 16px;
}
.reader-output-container .reader-output .reader-message.initial {
  color: #ffc107;
  font-style: italic;
}
.reader-output-container .reader-output .reader-message.initial i::before {
  content: "\f110";
  animation: spin 1s linear infinite;
}
.reader-output-container .reader-output .reader-message.landmark {
  color: #4CAF50;
}
.reader-output-container .reader-output .reader-message.structure {
  color: #17a2b8;
}
.reader-output-container .reader-output .reader-message.heading {
  color: #28a745;
  font-weight: 600;
}
.reader-output-container .reader-output .reader-message.link {
  color: #87CEEB;
}
.reader-output-container .reader-output .reader-message.content {
  color: #ecf0f1;
}
.reader-output-container .reader-output .reader-message.generic {
  color: #888;
}
.reader-output-container .reader-output .reader-message.completion {
  color: #28a745;
  font-weight: 600;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 2px solid #28a745;
}

.checklist-container {
  background: #e9ecef;
  border-radius: 0.625rem;
  padding: 1.25rem;
  border: 1px solid #e9ecef;
}
.checklist-container .checklist-title {
  margin: 0 0 1rem 0;
  color: #000000;
  font-size: 1.125rem;
  font-weight: 600;
  text-align: center;
}
.checklist-container .checklist {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}
.checklist-container .checklist .checklist-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.75rem;
  background: white;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: all 0.3s ease;
  border: 2px solid transparent;
}
.checklist-container .checklist .checklist-item:hover {
  background: rgba(76, 175, 80, 0.05);
  border-color: rgba(76, 175, 80, 0.2);
  transform: translateY(-1px);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}
.checklist-container .checklist .checklist-item .form-check-input {
  margin: 0;
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 2px;
  cursor: pointer;
}
.checklist-container .checklist .checklist-item .form-check-input:checked + .checklist-label {
  color: #28a745;
  font-weight: 500;
}
.checklist-container .checklist .checklist-item .checklist-label {
  color: #000000;
  font-size: 1rem;
  line-height: 1.5;
  cursor: pointer;
  transition: color 0.15s ease;
}

.score-container {
  text-align: center;
  padding: 1rem;
  border-radius: 0.5rem;
  background: #f8f9fa;
  border: 2px solid #e9ecef;
  transition: all 0.3s ease;
}
.score-container .score-label {
  font-size: 1.125rem;
  color: #000000;
}
.score-container .score-value {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 0.25rem;
}
.score-container.score-poor {
  background: rgba(220, 53, 69, 0.1);
  border-color: #dc3545;
}
.score-container.score-poor .score-value {
  color: #dc3545;
}
.score-container.score-okay {
  background: rgba(255, 193, 7, 0.1);
  border-color: #ffc107;
}
.score-container.score-okay .score-value {
  color: #ffc107;
}
.score-container.score-good {
  background: rgba(23, 162, 184, 0.1);
  border-color: #17a2b8;
}
.score-container.score-good .score-value {
  color: #17a2b8;
}
.score-container.score-excellent {
  background: rgba(40, 167, 69, 0.1);
  border-color: #28a745;
}
.score-container.score-excellent .score-value {
  color: #28a745;
}
.score-container.score-excellent::after {
  content: " 🎉";
  font-size: 1.25rem;
  margin-left: 0.5rem;
}

.accessibility-info .examples-section,
.accessibility-info .impact-section {
  margin-top: 1rem;
  padding: 0.75rem;
  background: #e9ecef;
  border-radius: 0.25rem;
}
.accessibility-info .examples-section strong,
.accessibility-info .impact-section strong {
  color: #4CAF50;
  font-weight: 600;
}
.accessibility-info .examples-section ul,
.accessibility-info .impact-section ul {
  margin: 0.5rem 0 0 0;
  padding-left: 1rem;
}
.accessibility-info .examples-section ul li,
.accessibility-info .impact-section ul li {
  margin-bottom: 0.5rem;
  color: #000000;
  line-height: 1.625;
}
.accessibility-info .examples-section p,
.accessibility-info .impact-section p {
  margin: 0.5rem 0 0 0;
  color: #000000;
  line-height: 1.625;
}

@keyframes pulse {
  0% {
    border-left-color: #4CAF50;
  }
  50% {
    border-left-color: rgba(76, 175, 80, 0.5);
  }
  100% {
    border-left-color: #4CAF50;
  }
}
@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}
.practice-grid {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.challenge-card {
  background: white;
  border-radius: 0.625rem;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  border: 1px solid #e9ecef;
}
.challenge-card .card-title {
  margin: 0 0 1rem 0;
  color: #4CAF50;
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.challenge-card .card-title::before {
  content: "🎯";
  font-size: 1.125rem;
}
.challenge-card p {
  color: #000000;
  line-height: 1.625;
  margin-bottom: 1rem;
}

.code-comparison {
  margin-bottom: 1.25rem;
}
.code-comparison .comparison-title {
  margin: 0 0 0.75rem 0;
  color: #000000;
  font-size: 1rem;
  font-weight: 600;
}
.code-comparison .code-block {
  background: #2c3e50;
  border-radius: 0.5rem;
  padding: 1rem;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
  color: #ecf0f1;
  overflow-x: auto;
  border-left: 4px solid #ffc107;
}
.code-comparison .code-block code {
  color: inherit;
  background: none;
}

.requirements-list {
  margin-bottom: 1.25rem;
  padding: 1rem;
  background: #e9ecef;
  border-radius: 0.5rem;
  border-left: 4px solid #17a2b8;
}
.requirements-list .list-title {
  margin: 0 0 0.75rem 0;
  color: #17a2b8;
  font-size: 1rem;
  font-weight: 600;
}
.requirements-list .list-items {
  margin: 0;
  padding-left: 1rem;
}
.requirements-list .list-items li {
  margin-bottom: 0.5rem;
  color: #000000;
  line-height: 1.625;
}

.solution-form {
  margin-bottom: 1rem;
}
.solution-form .form-title {
  margin: 0 0 0.75rem 0;
  color: #000000;
  font-size: 1rem;
  font-weight: 600;
}
.solution-form textarea.form-control {
  width: 100%;
  min-height: 200px;
  padding: 1rem;
  border: 2px solid #e9ecef;
  border-radius: 0.5rem;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
  line-height: 1.625;
  resize: vertical;
  transition: border-color 0.3s ease;
}
.solution-form textarea.form-control:focus {
  outline: none;
  border-color: #4CAF50;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.solution-form textarea.form-control::placeholder {
  color: #999;
  font-style: italic;
}
.solution-form .btn {
  margin-top: 0.75rem;
  padding: 0.75rem 1.25rem;
  font-weight: 600;
  transition: all 0.3s ease;
}
.solution-form .btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.result-feedback {
  display: none;
  margin-top: 1rem;
  border-radius: 0.5rem;
  overflow: hidden;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}
.result-feedback .result-header {
  padding: 1rem;
  color: white;
}
.result-feedback .result-header.success {
  background: linear-gradient(135deg, #28a745, rgb(30.1449275362, 125.8550724638, 52));
}
.result-feedback .result-header.warning {
  background: linear-gradient(135deg, #ffc107, rgb(211, 158.25, 0));
}
.result-feedback .result-header.error {
  background: linear-gradient(135deg, #dc3545, rgb(189.2151898734, 32.7848101266, 47.7721518987));
}
.result-feedback .result-header h5 {
  margin: 0 0 0.5rem 0;
  font-size: 1.125rem;
  font-weight: 700;
}
.result-feedback .result-header .score {
  font-size: 1rem;
  font-weight: 600;
  opacity: 0.9;
}
.result-feedback .feedback-list {
  padding: 1rem;
  background: white;
}
.result-feedback .feedback-list p {
  margin: 0 0 0.5rem 0;
  padding: 0.5rem;
  border-radius: 0.25rem;
  font-size: 0.875rem;
  line-height: 1.5;
}
.result-feedback .feedback-list p:last-child {
  margin-bottom: 0;
}
.result-feedback .feedback-list p:contains("✅") {
  background: rgba(40, 167, 69, 0.1);
  color: rgb(20.2898550725, 84.7101449275, 35);
  border-left: 3px solid #28a745;
}
.result-feedback .feedback-list p:contains("❌") {
  background: rgba(220, 53, 69, 0.1);
  color: rgb(145.746835443, 25.253164557, 36.7974683544);
  border-left: 3px solid #dc3545;
}
.result-feedback .feedback-list p:contains("💡") {
  background: rgba(23, 162, 184, 0.1);
  color: rgb(11.6666666667, 82.1739130435, 93.3333333333);
  border-left: 3px solid #17a2b8;
}
.result-feedback .hint {
  padding: 1rem;
  background: rgba(76, 175, 80, 0.05);
  border-top: 1px solid rgba(76, 175, 80, 0.1);
  color: #000000;
  font-size: 0.875rem;
  line-height: 1.625;
}
.result-feedback .hint strong {
  color: #4CAF50;
  font-weight: 600;
}
.result-feedback .hint br {
  margin-bottom: 0.25rem;
}

@media (max-width: 992px) {
  .simulation-container {
    padding: 1rem;
  }
  .checklist-container {
    padding: 1rem;
  }
  .reader-output {
    min-height: 150px;
    max-height: 300px;
  }
  .challenge-card {
    padding: 1.25rem;
  }
}
@media (max-width: 768px) {
  .accessibility-grid .grid-title,
  .simulation-grid .grid-title {
    font-size: 1.125rem;
  }
  .accessibility-grid p,
  .simulation-grid p {
    font-size: 1rem;
  }
  .reader-output-container .output-title {
    font-size: 1rem;
  }
  .score-container .score-label {
    font-size: 1rem;
  }
  .score-container .score-value {
    font-size: 1.25rem;
  }
  .challenge-card {
    padding: 1rem;
  }
  .challenge-card .card-title {
    font-size: 1.125rem;
  }
  .solution-form textarea.form-control {
    min-height: 150px;
    font-size: 0.75rem;
  }
}
.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 1.25rem;
  margin-top: 1.25rem;
}
@media (max-width: 768px) {
  .resource-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}

.resource-card {
  background: white;
  border-radius: 0.625rem;
  overflow: hidden;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
  border: 1px solid #e9ecef;
  position: relative;
}
.resource-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  border-color: rgba(76, 175, 80, 0.3);
}
.resource-card[data-type=youtube] {
  border-top: 4px solid #ff0000;
}
.resource-card[data-type=youtube] .card-thumbnail::before {
  background: linear-gradient(135deg, #ff0000, #cc0000);
}
.resource-card[data-type=documentation] {
  border-top: 4px solid #0066cc;
}
.resource-card[data-type=documentation] .card-thumbnail::before {
  background: linear-gradient(135deg, #0066cc, #004499);
}
.resource-card[data-type=tool] {
  border-top: 4px solid #28a745;
}
.resource-card[data-type=tool] .card-thumbnail::before {
  background: linear-gradient(135deg, #28a745, #1e7e34);
}
.resource-card[data-type=guide] {
  border-top: 4px solid #6f42c1;
}
.resource-card[data-type=guide] .card-thumbnail::before {
  background: linear-gradient(135deg, #6f42c1, #563d7c);
}
.resource-card[data-type=course] {
  border-top: 4px solid #fd7e14;
}
.resource-card[data-type=course] .card-thumbnail::before {
  background: linear-gradient(135deg, #fd7e14, #e55a0e);
}

.card-thumbnail {
  position: relative;
  height: 200px;
  background: #e9ecef;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.card-thumbnail::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, #4CAF50, rgb(52.8366533865, 121.6633466135, 55.6175298805));
  opacity: 0.1;
  z-index: 1;
}
.card-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
  z-index: 2;
  position: relative;
}
.card-thumbnail .thumbnail-icon {
  font-size: 2.25rem;
  color: rgba(76, 175, 80, 0.6);
  z-index: 3;
  position: relative;
}
.card-thumbnail .thumbnail-icon.youtube {
  color: #ff0000;
}
.card-thumbnail .thumbnail-icon.documentation {
  color: #0066cc;
}
.card-thumbnail .thumbnail-icon.tool {
  color: #28a745;
}
.card-thumbnail .thumbnail-icon.guide {
  color: #6f42c1;
}
.card-thumbnail .thumbnail-icon.course {
  color: #fd7e14;
}
.card-thumbnail .play-overlay {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(0, 0, 0, 0.7);
  border-radius: 50%;
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 4;
  transition: all 0.3s ease;
}
.card-thumbnail .play-overlay i {
  color: white;
  font-size: 1.25rem;
  margin-left: 4px;
}
.card-thumbnail .play-overlay:hover {
  background: rgba(0, 0, 0, 0.9);
  transform: translate(-50%, -50%) scale(1.1);
}

.card-body {
  padding: 1.25rem;
}
.card-body .card-header {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}
.card-body .card-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}
.card-body .card-icon.youtube {
  background: rgba(255, 0, 0, 0.1);
  color: #ff0000;
}
.card-body .card-icon.documentation {
  background: rgba(0, 102, 204, 0.1);
  color: #0066cc;
}
.card-body .card-icon.tool {
  background: rgba(40, 167, 69, 0.1);
  color: #28a745;
}
.card-body .card-icon.guide {
  background: rgba(111, 66, 193, 0.1);
  color: #6f42c1;
}
.card-body .card-icon.course {
  background: rgba(253, 126, 20, 0.1);
  color: #fd7e14;
}
.card-body .card-meta {
  flex: 1;
}
.card-body .card-title {
  margin: 0 0 0.25rem 0;
  font-size: 1.125rem;
  font-weight: 700;
  color: #000000;
  line-height: 1.25;
}
.card-body .card-title a {
  color: inherit;
  text-decoration: none;
}
.card-body .card-title a:hover {
  color: #4CAF50;
}
.card-body .card-subtitle {
  margin: 0 0 0.75rem 0;
  font-size: 0.875rem;
  color: #000000;
  font-weight: 500;
}
.card-body .card-subtitle .author {
  color: #4CAF50;
}
.card-body .card-subtitle .platform {
  color: #000000;
}
.card-body .card-subtitle .platform::before {
  content: " • ";
  margin: 0 0.25rem;
}
.card-body .card-description {
  margin: 0 0 1rem 0;
  color: #000000;
  line-height: 1.625;
  font-size: 0.875rem;
}
.card-body .card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin-bottom: 1rem;
}
.card-body .card-tags .tag {
  background: rgba(76, 175, 80, 0.1);
  color: #4CAF50;
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  font-size: 0.75rem;
  font-weight: 500;
}
.card-body .card-stats {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
  font-size: 0.875rem;
  color: #000000;
}
.card-body .card-stats .stat {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.card-body .card-stats .stat i {
  color: rgba(76, 175, 80, 0.7);
}
.card-body .card-actions {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}
.card-body .card-actions .btn {
  flex: 1;
  justify-content: center;
  font-weight: 600;
  transition: all 0.3s ease;
}
.card-body .card-actions .btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
.card-body .card-actions .btn.btn-primary {
  background: #4CAF50;
  border-color: #4CAF50;
}
.card-body .card-actions .btn.btn-primary:hover {
  background: rgb(60.5577689243, 139.4422310757, 63.7450199203);
  border-color: rgb(60.5577689243, 139.4422310757, 63.7450199203);
}
.card-body .card-actions .btn.btn-secondary {
  background: transparent;
  border: 2px solid #e9ecef;
  color: #000000;
}
.card-body .card-actions .btn.btn-secondary:hover {
  border-color: #4CAF50;
  color: #4CAF50;
}
.card-body .card-actions .bookmark-btn {
  width: 44px;
  height: 44px;
  border-radius: 0.5rem;
  border: 2px solid #e9ecef;
  background: white;
  color: #000000;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s ease;
}
.card-body .card-actions .bookmark-btn:hover {
  border-color: #ffc107;
  color: #ffc107;
}
.card-body .card-actions .bookmark-btn.bookmarked {
  border-color: #ffc107;
  color: #ffc107;
}
.card-body .card-actions .bookmark-btn.bookmarked i:before {
  content: "\f02e";
}

.resource-grid.two-column {
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
}
@media (max-width: 992px) {
  .resource-grid.two-column {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 768px) {
  .resource-grid.two-column {
    grid-template-columns: 1fr;
  }
}

.video-player-container {
  position: relative;
  width: 100%;
  max-width: 400px;
  margin: 0 auto;
  border-radius: 0.625rem;
  overflow: hidden;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}
.video-player-container video {
  width: 100%;
  height: auto;
  display: block;
}
.video-player-container .overlay-controls {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 10;
}
.video-player-container .overlay-controls .demo-button {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.8);
  color: white;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}
.video-player-container .overlay-controls .demo-button:hover {
  background: rgba(0, 0, 0, 0.9);
  transform: scale(1.1);
}
.video-player-container .overlay-controls .demo-button i {
  margin: 0;
}

.resource-grid.three-column {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}
@media (max-width: 1200px) {
  .resource-grid.three-column {
    grid-template-columns: repeat(3, 1fr);
  }
}
@media (max-width: 768px) {
  .resource-grid.three-column {
    grid-template-columns: 1fr;
  }
}

.resource-grid.four-column {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
@media (max-width: 1200px) {
  .resource-grid.four-column {
    grid-template-columns: repeat(4, 1fr);
  }
}
@media (max-width: 992px) {
  .resource-grid.four-column {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 768px) {
  .resource-grid.four-column {
    grid-template-columns: 1fr;
  }
}

.resource-card.compact .card-thumbnail {
  height: 120px;
}
.resource-card.compact .card-body {
  padding: 1rem;
}
.resource-card.compact .card-title {
  font-size: 1rem;
}
.resource-card.compact .card-description {
  font-size: 0.75rem;
  margin-bottom: 0.75rem;
}

.table-container {
  margin: 1.25rem 0;
  overflow-x: auto;
  border-radius: 0.625rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
  background: white;
  border: 1px solid #e9ecef;
}
.table-container h4 {
  margin: 0 0 1rem 0;
  color: #4CAF50;
  font-size: 1.125rem;
  font-weight: 600;
}

.attributes-table {
  width: 100%;
  border-collapse: collapse;
  margin: 0;
  font-size: 0.875rem;
}
.attributes-table .table-header th {
  background: linear-gradient(135deg, #4CAF50, #45a049);
  color: white;
  padding: 1rem 0.75rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.875rem;
  border-bottom: 2px solid rgba(255, 255, 255, 0.2);
  position: sticky;
  top: 0;
  z-index: 10;
}
.attributes-table .table-header th:first-child {
  border-top-left-radius: 0.5rem;
}
.attributes-table .table-header th:last-child {
  border-top-right-radius: 0.5rem;
}
.attributes-table .attribute-row {
  border-bottom: 1px solid #e9ecef;
  transition: background-color 0.15s ease;
}
.attributes-table .attribute-row:hover {
  background: rgba(76, 175, 80, 0.02);
}
.attributes-table .attribute-row:last-child {
  border-bottom: none;
}
.attributes-table .attribute-row .attribute-name {
  padding: 1rem 0.75rem;
  font-weight: 600;
  color: #4CAF50;
  font-family: "Courier New", monospace;
  background: rgba(76, 175, 80, 0.05);
  border-right: 1px solid #e9ecef;
  min-width: 120px;
  vertical-align: top;
}
.attributes-table .attribute-row .attribute-name code {
  background: transparent;
  color: #4CAF50;
  font-weight: 700;
  padding: 0;
}
.attributes-table .attribute-row .attribute-description {
  padding: 1rem 0.75rem;
  color: #000000;
  line-height: 1.625;
  border-right: 1px solid #e9ecef;
  flex: 1;
  vertical-align: top;
}
.attributes-table .attribute-row .attribute-example {
  padding: 1rem 0.75rem;
  background: #e9ecef;
  border-radius: 0.25rem;
  margin: 0.5rem 0.75rem;
  font-family: "Courier New", monospace;
  color: #000000;
  border: 1px solid rgba(233, 236, 239, 0.5);
  vertical-align: top;
  min-width: 200px;
}
.attributes-table .attribute-row .attribute-example code {
  background: transparent;
  color: #000000;
  font-size: 0.75rem;
  padding: 0;
  word-break: break-all;
}

@media (max-width: 768px) {
  .attributes-table {
    font-size: 0.75rem;
  }
  .attributes-table .table-header th {
    padding: 0.75rem 0.5rem;
    font-size: 0.75rem;
  }
  .attributes-table .attribute-row .attribute-name,
  .attributes-table .attribute-row .attribute-description,
  .attributes-table .attribute-row .attribute-example {
    padding: 0.75rem 0.5rem;
    display: block;
    border-right: none;
    border-bottom: 1px solid #e9ecef;
    margin: 0;
  }
  .attributes-table .attribute-row .attribute-name:last-child,
  .attributes-table .attribute-row .attribute-description:last-child,
  .attributes-table .attribute-row .attribute-example:last-child {
    border-bottom: none;
  }
  .attributes-table .attribute-row .attribute-name {
    font-weight: 700;
    background: rgba(76, 175, 80, 0.1);
  }
  .attributes-table .attribute-row .attribute-example {
    background: rgba(233, 236, 239, 0.5);
    margin: 0;
    border-radius: 0;
  }
}
.solution-panel {
  margin-top: 1rem;
  padding: 1rem;
  background: linear-gradient(135deg, rgba(233, 236, 239, 0.8), rgba(233, 236, 239, 0.4));
  border: 1px solid rgba(233, 236, 239, 0.8);
  border-radius: 0.625rem;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}
.solution-panel pre {
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(233, 236, 239, 0.5);
  border-radius: 0.5rem;
  padding: 1rem;
  margin: 0.75rem 0 0 0;
  overflow-x: auto;
}
.solution-panel pre code {
  background: transparent;
  font-size: 0.875rem;
  line-height: 1.625;
}
.solution-panel p {
  margin: 0.75rem 0 0 0;
}
.solution-panel p:first-child {
  margin: 0 0 0.75rem 0;
  font-weight: 600;
  color: #4CAF50;
}

.box-model-visualizer {
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  background: white;
  border-radius: 0.625rem;
  padding: 1.25rem;
  margin: 1.25rem 0;
}
.box-model-visualizer .controls-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 1.25rem;
}
@media (max-width: 576px) {
  .box-model-visualizer .controls-grid {
    grid-template-columns: 1fr;
  }
}
.box-model-visualizer .control-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.box-model-visualizer .control-group label {
  font-weight: 500;
  color: #000000;
  font-size: 0.875rem;
}
.box-model-visualizer .control-group input[type=range] {
  width: 100%;
  height: 6px;
  background: #e9ecef;
  border-radius: 50%;
  outline: none;
}
.box-model-visualizer .control-group input[type=range]::-webkit-slider-thumb {
  appearance: none;
  width: 20px;
  height: 20px;
  background: #4CAF50;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
.box-model-visualizer .control-group input[type=range]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  background: #4CAF50;
  border-radius: 50%;
  cursor: pointer;
  border: none;
}
.box-model-visualizer .control-group .value-display {
  font-weight: 600;
  color: #4CAF50;
  font-size: 0.875rem;
}
.box-model-visualizer .box-demo {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  background: #e9ecef;
  border-radius: 0.5rem;
  position: relative;
}
.box-model-visualizer .box-demo #demo-box {
  background: #FF9800;
  border: 2px solid #4CAF50;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
  text-align: center;
  transition: all 0.3s ease;
}
.box-model-visualizer .measurements {
  margin-top: 1rem;
  padding: 1rem;
  background: rgba(76, 175, 80, 0.1);
  border-radius: 0.5rem;
  text-align: center;
}
.box-model-visualizer .measurements .measurement-item {
  display: inline-block;
  margin: 0 1rem;
  font-weight: 500;
  color: #000000;
}
.box-model-visualizer .measurements .measurement-item span {
  color: #4CAF50;
  font-weight: 600;
}

.compact-controls .form-row {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}
@media (max-width: 576px) {
  .compact-controls .form-row {
    flex-direction: column;
    gap: 0.5rem;
  }
}
.compact-controls .form-group.compact {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.compact-controls .form-group.compact label {
  font-weight: 500;
  color: #000000;
  font-size: 0.75rem;
  white-space: nowrap;
}
.compact-controls .form-group.compact input[type=range] {
  width: 100%;
  height: 4px;
  background: #e9ecef;
  border-radius: 50%;
  outline: none;
  margin: 0.25rem 0;
}
.compact-controls .form-group.compact input[type=range]::-webkit-slider-thumb {
  appearance: none;
  width: 16px;
  height: 16px;
  background: #4CAF50;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}
.compact-controls .form-group.compact input[type=range]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  background: #4CAF50;
  border-radius: 50%;
  cursor: pointer;
  border: none;
}
.compact-controls .form-group.compact span {
  font-size: 0.75rem;
  font-weight: 600;
  color: #4CAF50;
  text-align: center;
}
.compact-controls h3 {
  font-size: 1.125rem;
  margin-bottom: 0.75rem;
}

.dimension-display {
  margin-top: 0.75rem;
  padding: 0.5rem;
  background: rgba(76, 175, 80, 0.05);
  border-radius: 0.5rem;
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}
.dimension-display .dimension-item {
  font-size: 0.875rem;
  color: #000000;
}
.dimension-display .dimension-item strong {
  margin-right: 0.25rem;
}
.dimension-display .dimension-item span {
  color: #4CAF50;
  font-weight: 600;
}
@media (max-width: 576px) {
  .dimension-display {
    flex-direction: column;
    text-align: center;
    gap: 0.25rem;
  }
}

.color-explorer {
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  background: white;
  border-radius: 0.625rem;
  padding: 1.25rem;
  margin: 1.25rem 0;
}
.color-explorer .color-controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin-bottom: 1.25rem;
}
@media (max-width: 576px) {
  .color-explorer .color-controls {
    grid-template-columns: 1fr;
  }
}
.color-explorer .color-input-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.color-explorer .color-input-group label {
  font-weight: 500;
  color: #000000;
  font-size: 0.875rem;
}
.color-explorer .color-input-group .color-input-wrapper {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}
.color-explorer .color-input-group .color-input-wrapper input[type=color] {
  width: 50px;
  height: 40px;
  border: 2px solid #e9ecef;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: border-color 0.3s ease;
}
.color-explorer .color-input-group .color-input-wrapper input[type=color]:hover {
  border-color: #4CAF50;
}
.color-explorer .color-input-group .color-input-wrapper input[type=text] {
  padding: 1rem;
  border: 2px solid #e9ecef;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  transition: border-color 0.3s ease;
  background: #ffffff;
}
.color-explorer .color-input-group .color-input-wrapper input[type=text]:focus {
  outline: none;
  border-color: #4CAF50;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.color-explorer .color-input-group .color-input-wrapper input[type=text]::placeholder {
  color: #000000;
}
.color-explorer .color-input-group .color-input-wrapper input[type=text] {
  flex: 1;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
}
.color-explorer .color-preview {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  border-radius: 0.5rem;
  border: 2px solid #e9ecef;
  font-size: 1.25rem;
  font-weight: 600;
  text-align: center;
  transition: all 0.3s ease;
  position: relative;
}
.color-explorer .color-preview::before {
  content: "";
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  border-radius: 0.5rem;
  background: linear-gradient(45deg, transparent 49%, rgba(0, 0, 0, 0.1) 50%, transparent 51%);
  pointer-events: none;
}

.selector-demo-area {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  padding: 1.25rem;
  background: #e9ecef;
  border-radius: 0.5rem;
  border: 2px dashed #e9ecef;
  min-height: 120px;
  align-items: center;
  justify-items: center;
}
@media (max-width: 768px) {
  .selector-demo-area {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }
}
@media (max-width: 576px) {
  .selector-demo-area {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }
}
.selector-demo-area .box {
  width: 80px;
  height: 80px;
  border-radius: 0.5rem;
  transition: all 0.3s ease;
  cursor: pointer;
  border: 2px solid rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}
@media (max-width: 576px) {
  .selector-demo-area .box {
    width: 60px;
    height: 60px;
  }
}
.selector-demo-area .box:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}
.selector-demo-area .box::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.3);
  transition: all 0.3s ease;
}
.selector-demo-area .box.red::after {
  background: #ef4444;
  width: 6px;
  height: 6px;
}
.selector-demo-area .box#target-box {
  border-color: rgba(239, 68, 68, 0.4);
}
.selector-demo-area .box#target-box:hover {
  border-color: rgba(239, 68, 68, 0.8);
}

.demo-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin: 1rem 0;
}
@media (max-width: 768px) {
  .demo-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}
.demo-grid .demo-controls h4 {
  margin-bottom: 0.75rem;
  color: #000000;
  font-size: 1.125rem;
}
.demo-grid .demo-controls p {
  margin-bottom: 1rem;
  color: #000000;
  line-height: 1.6;
}
.demo-grid .demo-controls .form-group {
  display: flex;
  gap: 0.75rem;
  align-items: stretch;
}
@media (max-width: 576px) {
  .demo-grid .demo-controls .form-group {
    flex-direction: column;
    gap: 0.5rem;
  }
}
.demo-grid .demo-controls .form-group .form-control {
  flex: 1;
  padding: 0.5rem 0.75rem;
  border: 1px solid #e9ecef;
  border-radius: 0.25rem;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
  transition: all 0.2s ease;
}
.demo-grid .demo-controls .form-group .form-control:focus {
  outline: none;
  border-color: #4CAF50;
  box-shadow: 0 0 0 2px rgba(76, 175, 80, 0.2);
}
.demo-grid .demo-controls .form-group .form-control::placeholder {
  color: rgba(0, 0, 0, 0.6);
  font-style: italic;
}
.demo-grid .demo-controls .form-group .btn {
  white-space: nowrap;
  min-width: 120px;
}
.demo-grid .demo-preview h4 {
  margin-bottom: 0.75rem;
  color: #000000;
  font-size: 1.125rem;
}
.demo-grid .demo-preview .selector-demo-area {
  margin-top: 0.5rem;
}

.demo-result {
  width: 100%;
  margin-top: 1rem;
  padding: 0;
  border-radius: 0.5rem;
  background: transparent;
  min-height: 0;
  box-sizing: border-box;
  display: none;
}
.demo-result:not(:empty) {
  display: block;
  padding: 1rem;
  background: #e9ecef;
  min-height: 100px;
}
.demo-result .loading {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem;
  color: #4CAF50;
  font-weight: 500;
}
.demo-result .loading i {
  font-size: 1.125rem;
  animation: spin 1s linear infinite;
}
.demo-result .result {
  padding: 1rem;
  border-radius: 0.5rem;
  border: 1px solid;
  background: white;
  width: 100%;
  box-sizing: border-box;
}
.demo-result .result h4 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  font-size: 1.125rem;
}
.demo-result .result h4 i {
  font-size: 1.25rem;
}
.demo-result .result.success {
  border-color: rgba(40, 167, 69, 0.3);
  background: rgba(40, 167, 69, 0.05);
}
.demo-result .result.success h4 {
  color: #28a745;
}
.demo-result .result.error {
  border-color: rgba(220, 53, 69, 0.3);
  background: rgba(220, 53, 69, 0.05);
}
.demo-result .result.error h4 {
  color: #dc3545;
}
.demo-result .result .response-info {
  margin-bottom: 0.75rem;
  padding: 0.75rem;
  background: rgba(76, 175, 80, 0.05);
  border-radius: 0.25rem;
  font-size: 0.875rem;
  line-height: 1.8;
}
.demo-result .result .response-info strong {
  color: #000000;
  font-weight: 600;
}
.demo-result .result .response-data {
  margin-bottom: 0.75rem;
  width: 100%;
}
.demo-result .result .response-data pre {
  background: #2c3e50;
  color: #f8f8f2;
  padding: 0.75rem;
  border-radius: 0.25rem;
  overflow-x: auto;
  max-height: 400px;
  overflow-y: auto;
  width: 100%;
  box-sizing: border-box;
}
.demo-result .result .response-data pre code {
  font-family: "Courier New", monospace;
  font-size: 0.875rem;
  line-height: 1.6;
  white-space: pre;
}
.demo-result .result .code-example {
  margin-top: 0.75rem;
  padding: 0.75rem;
  background: rgba(44, 62, 80, 0.05);
  border-radius: 0.25rem;
  border-left: 3px solid #4CAF50;
  width: 100%;
  box-sizing: border-box;
}
.demo-result .result .code-example strong {
  display: block;
  margin-bottom: 0.5rem;
  color: #000000;
  font-weight: 600;
}
.demo-result .result .code-example pre {
  background: #2c3e50;
  color: #f8f8f2;
  padding: 0.75rem;
  border-radius: 0.25rem;
  overflow-x: auto;
  margin-top: 0.5rem;
  width: 100%;
  box-sizing: border-box;
}
.demo-result .result .code-example pre code {
  font-family: "Courier New", monospace;
  font-size: 0.875rem;
  line-height: 1.6;
  white-space: pre;
}
.demo-result .feedback {
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  margin: 0.5rem 0;
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  font-size: 0.875rem;
  line-height: 1.6;
  border: 1px solid;
}
.demo-result .feedback i {
  margin-top: 2px;
  flex-shrink: 0;
  font-size: 1rem;
}
.demo-result .feedback.success {
  background: rgba(40, 167, 69, 0.1);
  border-color: rgba(40, 167, 69, 0.3);
  color: rgb(36, 150.3, 62.1);
}
.demo-result .feedback.success i {
  color: #28a745;
}
.demo-result .feedback.error {
  background: rgba(220, 53, 69, 0.1);
  border-color: rgba(220, 53, 69, 0.3);
  color: rgb(209.4151898734, 36.2848101266, 52.8721518987);
}
.demo-result .feedback.error i {
  color: #dc3545;
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}
.demo-tabs-container, .canvas-demo-container {
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  background: white;
  border-radius: 0.625rem;
  padding: 1.25rem;
  margin: 1.25rem 0;
}
.demo-tabs-container .tabbed-content .tab-buttons, .canvas-demo-container .tabbed-content .tab-buttons {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  border-bottom: 2px solid #e9ecef;
}
@media (max-width: 576px) {
  .demo-tabs-container .tabbed-content .tab-buttons, .canvas-demo-container .tabbed-content .tab-buttons {
    flex-wrap: wrap;
  }
}
.demo-tabs-container .tabbed-content .tab-buttons .tab-btn, .canvas-demo-container .tabbed-content .tab-buttons .tab-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.demo-tabs-container .tabbed-content .tab-buttons .tab-btn:focus, .canvas-demo-container .tabbed-content .tab-buttons .tab-btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.demo-tabs-container .tabbed-content .tab-buttons .tab-btn:disabled, .canvas-demo-container .tabbed-content .tab-buttons .tab-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.demo-tabs-container .tabbed-content .tab-buttons .tab-btn, .canvas-demo-container .tabbed-content .tab-buttons .tab-btn {
  background: transparent;
  color: #000000;
  border: none;
  border-bottom: 3px solid transparent;
  border-radius: 0;
  padding: 0.75rem 1rem;
  font-weight: 500;
  transition: all 0.3s ease;
  cursor: pointer;
}
.demo-tabs-container .tabbed-content .tab-buttons .tab-btn:hover, .canvas-demo-container .tabbed-content .tab-buttons .tab-btn:hover {
  color: #4CAF50;
  background: rgba(76, 175, 80, 0.05);
}
.demo-tabs-container .tabbed-content .tab-buttons .tab-btn.active, .canvas-demo-container .tabbed-content .tab-buttons .tab-btn.active {
  color: #4CAF50;
  border-bottom-color: #4CAF50;
  background: rgba(76, 175, 80, 0.1);
}
.demo-tabs-container .tabbed-content .tab-buttons .tab-btn:focus, .canvas-demo-container .tabbed-content .tab-buttons .tab-btn:focus {
  outline: 2px solid rgba(76, 175, 80, 0.3);
  outline-offset: 2px;
}
.demo-tabs-container .tabbed-content .tab-panels .tab-pane, .canvas-demo-container .tabbed-content .tab-panels .tab-pane {
  display: none;
}
.demo-tabs-container .tabbed-content .tab-panels .tab-pane.active, .canvas-demo-container .tabbed-content .tab-panels .tab-pane.active {
  display: block;
  animation: fadeIn 0.2s ease forwards;
}
.demo-tabs-container .demo-controls, .canvas-demo-container .demo-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  margin-bottom: 1rem;
  padding: 1rem;
  background: #e9ecef;
  border-radius: 0.5rem;
}
@media (max-width: 576px) {
  .demo-tabs-container .demo-controls, .canvas-demo-container .demo-controls {
    flex-direction: column;
    align-items: stretch;
  }
}
.demo-tabs-container .demo-controls label, .canvas-demo-container .demo-controls label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 500;
  color: #000000;
  font-size: 0.875rem;
}
.demo-tabs-container .demo-controls label i, .canvas-demo-container .demo-controls label i {
  color: #4CAF50;
  margin-right: 0.25rem;
}
.demo-tabs-container .demo-controls input[type=range], .canvas-demo-container .demo-controls input[type=range] {
  min-width: 100px;
  max-width: 150px;
}
.demo-tabs-container .demo-controls input[type=color], .canvas-demo-container .demo-controls input[type=color] {
  width: 40px;
  height: 30px;
  border: 1px solid #e9ecef;
  border-radius: 0.25rem;
  cursor: pointer;
}
.demo-tabs-container .demo-controls .btn, .canvas-demo-container .demo-controls .btn {
  font-size: 0.875rem;
  padding: 0.5rem 0.75rem;
}
.demo-tabs-container .demo-output, .canvas-demo-container .demo-output {
  background: #e9ecef;
  padding: 1rem;
  border-radius: 0.5rem;
  border: 1px solid #e9ecef;
  margin-bottom: 1rem;
}
.demo-tabs-container .caption, .canvas-demo-container .caption {
  font-size: 0.875rem;
  color: #000000;
  margin-top: 0.75rem;
  text-align: center;
  font-style: italic;
}
.demo-tabs-container .caption i, .canvas-demo-container .caption i {
  margin-right: 0.25rem;
  color: #4CAF50;
}
.demo-tabs-container canvas, .canvas-demo-container canvas {
  display: block;
  margin: 0 auto;
  cursor: crosshair;
}
.demo-tabs-container canvas:hover, .canvas-demo-container canvas:hover {
  box-shadow: 0 0 10px rgba(76, 175, 80, 0.3);
}
.demo-tabs-container .iframe-responsive-container, .canvas-demo-container .iframe-responsive-container {
  position: relative;
  width: 100%;
  height: 0;
  padding-bottom: 56.25%;
  overflow: hidden;
  border-radius: 0.5rem;
}
.demo-tabs-container .iframe-responsive-container iframe, .canvas-demo-container .iframe-responsive-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.ajax-demo-container {
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  background: white;
  border-radius: 0.625rem;
  padding: 1.25rem;
  margin: 1.25rem 0;
}
.ajax-demo-container .demo-form {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}
@media (max-width: 576px) {
  .ajax-demo-container .demo-form {
    grid-template-columns: 1fr;
  }
}
.ajax-demo-container .demo-form .form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.ajax-demo-container .demo-form .form-group label {
  font-weight: 500;
  color: #000000;
  font-size: 0.875rem;
}
.ajax-demo-container .demo-form .form-group input, .ajax-demo-container .demo-form .form-group select, .ajax-demo-container .demo-form .form-group textarea {
  padding: 1rem;
  border: 2px solid #e9ecef;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  transition: border-color 0.3s ease;
  background: #ffffff;
}
.ajax-demo-container .demo-form .form-group input:focus, .ajax-demo-container .demo-form .form-group select:focus, .ajax-demo-container .demo-form .form-group textarea:focus {
  outline: none;
  border-color: #4CAF50;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.ajax-demo-container .demo-form .form-group input::placeholder, .ajax-demo-container .demo-form .form-group select::placeholder, .ajax-demo-container .demo-form .form-group textarea::placeholder {
  color: #000000;
}
.ajax-demo-container .demo-form .form-group input, .ajax-demo-container .demo-form .form-group select, .ajax-demo-container .demo-form .form-group textarea {
  width: 100%;
}
.ajax-demo-container .demo-form .form-group textarea {
  min-height: 80px;
  resize: vertical;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
}
.ajax-demo-container .xhr-result {
  margin-top: 1rem;
  padding: 1rem;
  background: #e9ecef;
  border: 1px solid #e9ecef;
  border-radius: 0.5rem;
  min-height: 100px;
}
.ajax-demo-container .xhr-result .loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  color: #4CAF50;
  font-weight: 500;
}
.ajax-demo-container .xhr-result .loading i {
  animation: spin 1s linear infinite;
}
.ajax-demo-container .xhr-result .success {
  color: #28a745;
}
.ajax-demo-container .xhr-result .success h4 {
  color: #28a745;
  margin-bottom: 0.75rem;
}
.ajax-demo-container .xhr-result .error {
  color: #dc3545;
}
.ajax-demo-container .xhr-result .error h4 {
  color: #dc3545;
  margin-bottom: 0.75rem;
}
.ajax-demo-container .xhr-result pre {
  background: #2c3e50;
  color: #ecf0f1;
  padding: 0.75rem;
  border-radius: 0.25rem;
  overflow-x: auto;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
  margin-top: 0.75rem;
}
.ajax-demo-container .search-results {
  max-height: 300px;
  overflow-y: auto;
  border: 1px solid #e9ecef;
  border-radius: 0.5rem;
  background: white;
}
.ajax-demo-container .search-results .search-item {
  padding: 0.75rem;
  border-bottom: 1px solid #e9ecef;
  cursor: pointer;
  transition: background-color 0.3s ease;
}
.ajax-demo-container .search-results .search-item:hover {
  background: #e9ecef;
}
.ajax-demo-container .search-results .search-item:last-child {
  border-bottom: none;
}
.ajax-demo-container .search-results .search-item .search-title {
  font-weight: 500;
  color: #4CAF50;
  margin-bottom: 0.5rem;
}
.ajax-demo-container .search-results .search-item .search-excerpt {
  color: #000000;
  font-size: 0.875rem;
  line-height: 1.5;
}
.ajax-demo-container .scroll-container {
  max-height: 400px;
  overflow-y: auto;
  border: 1px solid #e9ecef;
  border-radius: 0.5rem;
}
.ajax-demo-container .scroll-container .scroll-content .scroll-item {
  padding: 1rem;
  border-bottom: 1px solid #e9ecef;
}
.ajax-demo-container .scroll-container .scroll-content .scroll-item:last-child {
  border-bottom: none;
}
.ajax-demo-container .scroll-container .scroll-content .scroll-item .item-title {
  font-weight: 500;
  color: #4CAF50;
  margin-bottom: 0.5rem;
}
.ajax-demo-container .scroll-container .scroll-content .scroll-item .item-content {
  color: #000000;
  line-height: 1.5;
}
.ajax-demo-container .scroll-container .loading-spinner {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  color: #4CAF50;
}
.ajax-demo-container .scroll-container .loading-spinner i {
  animation: spin 1s linear infinite;
  margin-right: 0.75rem;
}

.json-demo-container {
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  background: white;
  border-radius: 0.625rem;
  padding: 1.25rem;
  margin: 1.25rem 0;
}
.json-demo-container .tab-buttons {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  border-bottom: 2px solid #e9ecef;
}
@media (max-width: 576px) {
  .json-demo-container .tab-buttons {
    flex-wrap: wrap;
  }
}
.json-demo-container .tab-buttons .tab-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.json-demo-container .tab-buttons .tab-btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.json-demo-container .tab-buttons .tab-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.json-demo-container .tab-buttons .tab-btn {
  background: transparent;
  color: #000000;
  border: none;
  border-bottom: 3px solid transparent;
  border-radius: 0;
  padding: 0.75rem 1rem;
  font-weight: 500;
  transition: all 0.3s ease;
}
.json-demo-container .tab-buttons .tab-btn:hover {
  color: #4CAF50;
}
.json-demo-container .tab-buttons .tab-btn.active {
  color: #4CAF50;
  border-bottom-color: #4CAF50;
  background: rgba(76, 175, 80, 0.1);
}
.json-demo-container .tab-panels .tab-pane {
  display: none;
}
.json-demo-container .tab-panels .tab-pane.active {
  display: block;
  animation: fadeIn 0.2s ease forwards;
}
.json-demo-container .demo-card {
  padding: 1.25rem;
  background: #e9ecef;
  border-radius: 0.5rem;
  border: 1px solid #e9ecef;
}
.json-demo-container .demo-card h5 {
  margin-bottom: 1rem;
  color: #4CAF50;
  font-weight: 600;
}
.json-demo-container .demo-card .form-group {
  margin-bottom: 1rem;
}
.json-demo-container .demo-card .form-group label {
  display: block;
  font-weight: 500;
  color: #000000;
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
}
.json-demo-container .demo-card .form-group input, .json-demo-container .demo-card .form-group select {
  padding: 1rem;
  border: 2px solid #e9ecef;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  transition: border-color 0.3s ease;
  background: #ffffff;
}
.json-demo-container .demo-card .form-group input:focus, .json-demo-container .demo-card .form-group select:focus {
  outline: none;
  border-color: #4CAF50;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.json-demo-container .demo-card .form-group input::placeholder, .json-demo-container .demo-card .form-group select::placeholder {
  color: #000000;
}
.json-demo-container .demo-card .form-group input, .json-demo-container .demo-card .form-group select {
  width: 100%;
  margin-bottom: 0.75rem;
}
.json-demo-container .demo-card .button-group {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
}
@media (max-width: 576px) {
  .json-demo-container .demo-card .button-group {
    flex-direction: column;
  }
}
.json-demo-container .demo-card .result-box {
  padding: 1rem;
  border-radius: 0.5rem;
  margin-top: 1rem;
}
.json-demo-container .demo-card .result-box.success {
  background: rgba(40, 167, 69, 0.1);
  border: 1px solid rgba(40, 167, 69, 0.3);
  color: #28a745;
}
.json-demo-container .demo-card .result-box.error {
  background: rgba(220, 53, 69, 0.1);
  border: 1px solid rgba(220, 53, 69, 0.3);
  color: #dc3545;
}
.json-demo-container .demo-card .result-box.info {
  background: rgba(76, 175, 80, 0.1);
  border: 1px solid rgba(76, 175, 80, 0.3);
  color: #4CAF50;
}
.json-demo-container .demo-card .result-box h5 {
  margin-bottom: 0.75rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.json-demo-container .demo-card .result-box h5 i {
  color: #28a745;
}
.json-demo-container .demo-card .result-box .solution-code {
  margin: 0.75rem 0;
}
.json-demo-container .demo-card .result-box .solution-code pre {
  background: rgba(255, 255, 255, 0.9);
  color: #000000;
  border: 1px solid rgba(233, 236, 239, 0.5);
}
.json-demo-container .demo-card .result-box .solution-explanation {
  margin-top: 0.75rem;
}
.json-demo-container .demo-card .result-box .solution-explanation p {
  margin-bottom: 0.5rem;
  color: inherit;
}
.json-demo-container .demo-card .result-box .solution-explanation ul {
  margin: 0.5rem 0;
  padding-left: 1rem;
}
.json-demo-container .demo-card .result-box .solution-explanation ul li {
  margin-bottom: 0.25rem;
  color: inherit;
}
.json-demo-container .demo-card .result-box .solution-explanation ul li code {
  background: rgba(255, 255, 255, 0.8);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 0.75rem;
  color: #4CAF50;
  font-weight: 600;
}
.json-demo-container .demo-card .result-box pre {
  background: rgba(0, 0, 0, 0.05);
  padding: 0.75rem;
  border-radius: 0.25rem;
  overflow-x: auto;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
  margin-top: 0.75rem;
  color: inherit;
}
.json-demo-container .demo-card .result-box .conversion-demo {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 0.75rem;
}
@media (max-width: 768px) {
  .json-demo-container .demo-card .result-box .conversion-demo {
    grid-template-columns: 1fr;
  }
}
.json-demo-container .demo-card .result-box .conversion-demo .form-data h6, .json-demo-container .demo-card .result-box .conversion-demo .json-output h6 {
  margin-bottom: 0.75rem;
  font-weight: 600;
}
.json-demo-container .demo-card .result-box .conversion-demo .form-data ul, .json-demo-container .demo-card .result-box .conversion-demo .json-output ul {
  margin: 0;
  padding-left: 1rem;
}
.json-demo-container .demo-card .result-box .conversion-demo .form-data ul li, .json-demo-container .demo-card .result-box .conversion-demo .json-output ul li {
  margin-bottom: 0.5rem;
}

.regex-tester {
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  background: white;
  border-radius: 0.625rem;
  padding: 1.25rem;
  margin: 1.25rem 0;
}
.regex-tester .demo-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}
@media (max-width: 768px) {
  .regex-tester .demo-grid {
    grid-template-columns: 1fr;
  }
}
.regex-tester .demo-controls label {
  display: block;
  font-weight: 500;
  color: #000000;
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
}
.regex-tester .demo-controls input[type=text] {
  padding: 1rem;
  border: 2px solid #e9ecef;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  transition: border-color 0.3s ease;
  background: #ffffff;
}
.regex-tester .demo-controls input[type=text]:focus {
  outline: none;
  border-color: #4CAF50;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.regex-tester .demo-controls input[type=text]::placeholder {
  color: #000000;
}
.regex-tester .demo-controls input[type=text] {
  width: 100%;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
  margin-bottom: 1rem;
}
.regex-tester .demo-controls textarea {
  padding: 1rem;
  border: 2px solid #e9ecef;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  transition: border-color 0.3s ease;
  background: #ffffff;
}
.regex-tester .demo-controls textarea:focus {
  outline: none;
  border-color: #4CAF50;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.regex-tester .demo-controls textarea::placeholder {
  color: #000000;
}
.regex-tester .demo-controls textarea {
  width: 100%;
  min-height: 120px;
  resize: vertical;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
}
.regex-tester .demo-result .result-header {
  margin-bottom: 1rem;
}
.regex-tester .demo-result .result-header h5 {
  margin-bottom: 0.75rem;
  color: #4CAF50;
  font-weight: 600;
}
.regex-tester .demo-result .match-summary {
  padding: 0.75rem;
  border-radius: 0.5rem;
  margin-bottom: 1rem;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
}
.regex-tester .demo-result .match-summary.success {
  background: rgba(40, 167, 69, 0.1);
  border: 1px solid rgba(40, 167, 69, 0.3);
  color: #28a745;
}
.regex-tester .demo-result .match-summary.error {
  background: rgba(220, 53, 69, 0.1);
  border: 1px solid rgba(220, 53, 69, 0.3);
  color: #dc3545;
}
.regex-tester .demo-result .match-summary .match-count {
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.regex-tester .demo-result .match-summary .match-list {
  font-style: italic;
}
.regex-tester .demo-result .match-summary .match-list.error {
  font-style: normal;
}
.regex-tester .demo-result .highlight-container {
  padding: 1rem;
  background: #e9ecef;
  border: 1px solid #e9ecef;
  border-radius: 0.5rem;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
  line-height: 1.5;
}
.regex-tester .demo-result .highlight-container .highlight {
  background: #FF9800;
  color: white;
  padding: 2px 4px;
  border-radius: 0.25rem;
  font-weight: 600;
}
.regex-tester .demo-buttons {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
}
@media (max-width: 576px) {
  .regex-tester .demo-buttons {
    flex-direction: column;
  }
}

.accessibility-testing {
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  background: white;
  border-radius: 0.625rem;
  padding: 1.25rem;
  margin: 1.25rem 0;
}
.accessibility-testing .test-buttons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}
@media (max-width: 576px) {
  .accessibility-testing .test-buttons {
    grid-template-columns: 1fr;
  }
}
.accessibility-testing .test-results-container {
  margin-top: 1.25rem;
}
.accessibility-testing .test-results-container .test-result {
  padding: 1rem;
  border-radius: 0.5rem;
  margin-bottom: 1rem;
}
.accessibility-testing .test-results-container .test-result.success {
  background: rgba(40, 167, 69, 0.1);
  border: 1px solid rgba(40, 167, 69, 0.3);
  color: #28a745;
}
.accessibility-testing .test-results-container .test-result.warning {
  background: rgba(255, 193, 7, 0.1);
  border: 1px solid rgba(255, 193, 7, 0.3);
  color: #ffc107;
}
.accessibility-testing .test-results-container .test-result.error {
  background: rgba(220, 53, 69, 0.1);
  border: 1px solid rgba(220, 53, 69, 0.3);
  color: #dc3545;
}
.accessibility-testing .test-results-container .test-result.info {
  background: rgba(76, 175, 80, 0.1);
  border: 1px solid rgba(76, 175, 80, 0.3);
  color: #4CAF50;
}
.accessibility-testing .test-results-container .test-result h4 {
  margin-bottom: 0.75rem;
  font-weight: 600;
}
.accessibility-testing .test-results-container .test-result h4 i {
  margin-right: 0.5rem;
}
.accessibility-testing .test-results-container .test-result h5 {
  margin: 1rem 0 0.75rem 0;
  font-weight: 600;
}
.accessibility-testing .test-results-container .test-result ul {
  margin: 0.75rem 0;
  padding-left: 1rem;
}
.accessibility-testing .test-results-container .test-result ul li {
  margin-bottom: 0.5rem;
  line-height: 1.5;
}
.accessibility-testing .test-results-container .test-result .contrast-info, .accessibility-testing .test-results-container .test-result .nav-results, .accessibility-testing .test-results-container .test-result .screenreader-output, .accessibility-testing .test-results-container .test-result .form-analysis, .accessibility-testing .test-results-container .test-result .heading-outline {
  margin: 1rem 0;
  padding: 0.75rem;
  background: rgba(255, 255, 255, 0.5);
  border-radius: 0.25rem;
}
.accessibility-testing .test-results-container .test-result .contrast-info p, .accessibility-testing .test-results-container .test-result .contrast-info .nav-item, .accessibility-testing .test-results-container .test-result .nav-results p, .accessibility-testing .test-results-container .test-result .nav-results .nav-item, .accessibility-testing .test-results-container .test-result .screenreader-output p, .accessibility-testing .test-results-container .test-result .screenreader-output .nav-item, .accessibility-testing .test-results-container .test-result .form-analysis p, .accessibility-testing .test-results-container .test-result .form-analysis .nav-item, .accessibility-testing .test-results-container .test-result .heading-outline p, .accessibility-testing .test-results-container .test-result .heading-outline .nav-item {
  margin-bottom: 0.5rem;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
}
.accessibility-testing .test-results-container .test-result .contrast-info p:last-child, .accessibility-testing .test-results-container .test-result .contrast-info .nav-item:last-child, .accessibility-testing .test-results-container .test-result .nav-results p:last-child, .accessibility-testing .test-results-container .test-result .nav-results .nav-item:last-child, .accessibility-testing .test-results-container .test-result .screenreader-output p:last-child, .accessibility-testing .test-results-container .test-result .screenreader-output .nav-item:last-child, .accessibility-testing .test-results-container .test-result .form-analysis p:last-child, .accessibility-testing .test-results-container .test-result .form-analysis .nav-item:last-child, .accessibility-testing .test-results-container .test-result .heading-outline p:last-child, .accessibility-testing .test-results-container .test-result .heading-outline .nav-item:last-child {
  margin-bottom: 0;
}
.accessibility-testing .test-results-container .test-result .contrast-info .nav-item, .accessibility-testing .test-results-container .test-result .nav-results .nav-item, .accessibility-testing .test-results-container .test-result .screenreader-output .nav-item, .accessibility-testing .test-results-container .test-result .form-analysis .nav-item, .accessibility-testing .test-results-container .test-result .heading-outline .nav-item {
  padding: 0.5rem;
  border-radius: 0.25rem;
}
.accessibility-testing .test-results-container .test-result .contrast-info .nav-item.success, .accessibility-testing .test-results-container .test-result .nav-results .nav-item.success, .accessibility-testing .test-results-container .test-result .screenreader-output .nav-item.success, .accessibility-testing .test-results-container .test-result .form-analysis .nav-item.success, .accessibility-testing .test-results-container .test-result .heading-outline .nav-item.success {
  background: rgba(40, 167, 69, 0.1);
  color: #28a745;
}
.accessibility-testing .test-results-container .test-result .contrast-info .nav-item.warning, .accessibility-testing .test-results-container .test-result .nav-results .nav-item.warning, .accessibility-testing .test-results-container .test-result .screenreader-output .nav-item.warning, .accessibility-testing .test-results-container .test-result .form-analysis .nav-item.warning, .accessibility-testing .test-results-container .test-result .heading-outline .nav-item.warning {
  background: rgba(255, 193, 7, 0.1);
  color: #ffc107;
}
.accessibility-testing .test-results-container .test-result .contrast-info pre, .accessibility-testing .test-results-container .test-result .nav-results pre, .accessibility-testing .test-results-container .test-result .screenreader-output pre, .accessibility-testing .test-results-container .test-result .form-analysis pre, .accessibility-testing .test-results-container .test-result .heading-outline pre {
  background: rgba(0, 0, 0, 0.05);
  padding: 0.75rem;
  border-radius: 0.25rem;
  overflow-x: auto;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.75rem;
  color: #000000;
  margin: 0.75rem 0;
}
.accessibility-testing .test-results-container .test-result .contrast-info .heading-tree, .accessibility-testing .test-results-container .test-result .nav-results .heading-tree, .accessibility-testing .test-results-container .test-result .screenreader-output .heading-tree, .accessibility-testing .test-results-container .test-result .form-analysis .heading-tree, .accessibility-testing .test-results-container .test-result .heading-outline .heading-tree {
  margin: 0;
  padding-left: 1rem;
}
.accessibility-testing .test-results-container .test-result .contrast-info .heading-tree ul, .accessibility-testing .test-results-container .test-result .nav-results .heading-tree ul, .accessibility-testing .test-results-container .test-result .screenreader-output .heading-tree ul, .accessibility-testing .test-results-container .test-result .form-analysis .heading-tree ul, .accessibility-testing .test-results-container .test-result .heading-outline .heading-tree ul {
  margin-left: 1rem;
  margin-top: 0.5rem;
}
.accessibility-testing .test-results-container .test-result .recommendations, .accessibility-testing .test-results-container .test-result .best-practices, .accessibility-testing .test-results-container .test-result .sr-tips, .accessibility-testing .test-results-container .test-result .instructions, .accessibility-testing .test-results-container .test-result .heading-tips {
  margin-top: 1rem;
}
.accessibility-testing .test-results-container .test-result .recommendations h5, .accessibility-testing .test-results-container .test-result .best-practices h5, .accessibility-testing .test-results-container .test-result .sr-tips h5, .accessibility-testing .test-results-container .test-result .instructions h5, .accessibility-testing .test-results-container .test-result .heading-tips h5 {
  margin-bottom: 0.75rem;
}
.accessibility-testing .test-results-container .test-result .recommendations ul, .accessibility-testing .test-results-container .test-result .best-practices ul, .accessibility-testing .test-results-container .test-result .sr-tips ul, .accessibility-testing .test-results-container .test-result .instructions ul, .accessibility-testing .test-results-container .test-result .heading-tips ul {
  margin: 0;
  padding-left: 1rem;
}
.accessibility-testing .test-results-container .test-result .recommendations ul li, .accessibility-testing .test-results-container .test-result .best-practices ul li, .accessibility-testing .test-results-container .test-result .sr-tips ul li, .accessibility-testing .test-results-container .test-result .instructions ul li, .accessibility-testing .test-results-container .test-result .heading-tips ul li {
  margin-bottom: 0.5rem;
}
.accessibility-testing .test-results-container .test-result .recommendations p, .accessibility-testing .test-results-container .test-result .best-practices p, .accessibility-testing .test-results-container .test-result .sr-tips p, .accessibility-testing .test-results-container .test-result .instructions p, .accessibility-testing .test-results-container .test-result .heading-tips p {
  margin: 0.5rem 0;
  font-style: italic;
}
.accessibility-testing .aria-live-demo .progress-demo {
  margin: 1rem 0;
}
.accessibility-testing .aria-live-demo .progress-demo .progress-bar {
  width: 100%;
  height: 20px;
  background: #e9ecef;
  border-radius: 50%;
  overflow: hidden;
  border: 1px solid #e9ecef;
}
.accessibility-testing .aria-live-demo .progress-demo .progress-bar .progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #4CAF50, #FF9800);
  width: 0%;
  transition: width 0.3s ease;
  border-radius: 50%;
}
.accessibility-testing .aria-live-demo .live-region-demo {
  margin: 1rem 0;
}
.accessibility-testing .aria-live-demo .live-region-demo #live-announcements {
  padding: 0.75rem;
  background: rgba(76, 175, 80, 0.1);
  border: 1px solid rgba(76, 175, 80, 0.3);
  border-radius: 0.5rem;
  min-height: 40px;
  font-style: italic;
  color: #4CAF50;
}

.uiux-design-demo {
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  background: white;
  border-radius: 0.625rem;
  padding: 1.25rem;
  margin: 1.25rem 0;
}
.uiux-design-demo .design-principles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.25rem;
  margin: 1.25rem 0;
}
.uiux-design-demo .design-principles .principle-card {
  padding: 1rem;
  background: #e9ecef;
  border: 1px solid #e9ecef;
  border-radius: 0.5rem;
  text-align: center;
  transition: all 0.3s ease;
}
.uiux-design-demo .design-principles .principle-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}
.uiux-design-demo .design-principles .principle-card .principle-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  background: #4CAF50;
  color: white;
  border-radius: 50%;
  margin: 0 auto 1rem auto;
}
.uiux-design-demo .design-principles .principle-card .principle-icon i {
  font-size: 1.25rem;
}
.uiux-design-demo .design-principles .principle-card h4 {
  margin-bottom: 0.75rem;
  color: #4CAF50;
  font-weight: 600;
}
.uiux-design-demo .design-principles .principle-card p {
  color: #000000;
  line-height: 1.5;
  margin-bottom: 1rem;
}
.uiux-design-demo .design-patterns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin: 1.25rem 0;
}
.uiux-design-demo .design-patterns .pattern-card {
  padding: 1rem;
  background: #e9ecef;
  border: 1px solid #e9ecef;
  border-radius: 0.5rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
}
.uiux-design-demo .design-patterns .pattern-card:hover {
  background: rgba(76, 175, 80, 0.1);
  border-color: #4CAF50;
}
.uiux-design-demo .design-patterns .pattern-card i {
  font-size: 1.5rem;
  color: #4CAF50;
  margin-bottom: 0.75rem;
}
.uiux-design-demo .design-patterns .pattern-card h5 {
  color: #000000;
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.uiux-design-demo .design-patterns .pattern-card p {
  color: #000000;
  font-size: 0.875rem;
  line-height: 1.5;
}
.uiux-design-demo .design-playground {
  margin: 1.25rem 0;
  padding: 1.25rem;
  background: white;
  border: 2px dashed #e9ecef;
  border-radius: 0.625rem;
  text-align: center;
  font-size: 1.125rem;
  transition: all 0.3s ease;
}
.uiux-design-demo .design-playground h3 {
  margin-bottom: 1rem;
}
.uiux-design-demo .design-playground p {
  line-height: 1.625;
}
.uiux-design-demo .design-controls {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  margin: 1rem 0;
}
@media (max-width: 576px) {
  .uiux-design-demo .design-controls {
    flex-direction: column;
  }
}
.uiux-design-demo .design-feedback {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(76, 175, 80, 0.95);
  color: white;
  padding: 1rem 1.25rem;
  border-radius: 0.625rem;
  font-weight: 500;
  z-index: 1070;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.uiux-design-demo .design-feedback.show {
  opacity: 1;
}

.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1050;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}
.modal[style*=flex] {
  opacity: 1;
  visibility: visible;
}
.modal .modal-content {
  background: white;
  border-radius: 0.625rem;
  max-width: 90vw;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
  animation: modalSlideIn 0.3s ease forwards;
}
@media (max-width: 768px) {
  .modal .modal-content {
    max-width: 95vw;
    margin: 1rem;
  }
}
.modal .modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem;
  border-bottom: 1px solid #e9ecef;
}
.modal .modal-header h3 {
  margin: 0;
  color: #4CAF50;
  font-weight: 600;
}
.modal .modal-header h3 i {
  margin-right: 0.75rem;
}
.modal .modal-header .modal-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
}
.modal .modal-header .modal-close:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.modal .modal-header .modal-close:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}
.modal .modal-header .modal-close {
  background: transparent;
  border: none;
  font-size: 1.25rem;
  color: #000000;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 50%;
  transition: all 0.3s ease;
}
.modal .modal-header .modal-close:hover {
  background: #e9ecef;
  color: #000000;
}
.modal .modal-body {
  padding: 1.25rem;
}
.modal .modal-body .principle-description, .modal .modal-body .pattern-description {
  font-size: 1.125rem;
  line-height: 1.625;
  color: #000000;
  margin-bottom: 1.25rem;
}
.modal .modal-body .principle-section, .modal .modal-body .pattern-example {
  margin-bottom: 1.25rem;
}
.modal .modal-body .principle-section h4, .modal .modal-body .pattern-example h4 {
  color: #4CAF50;
  font-weight: 600;
  margin-bottom: 1rem;
}
.modal .modal-body .principle-section h4 i, .modal .modal-body .pattern-example h4 i {
  margin-right: 0.75rem;
}
.modal .modal-body .principle-section .principle-list, .modal .modal-body .pattern-example .principle-list {
  margin: 0;
  padding-left: 1rem;
}
.modal .modal-body .principle-section .principle-list li, .modal .modal-body .pattern-example .principle-list li {
  margin-bottom: 0.75rem;
  line-height: 1.5;
}
.modal .modal-body .principle-section pre, .modal .modal-body .pattern-example pre {
  background: #2c3e50;
  color: #ecf0f1;
  padding: 1rem;
  border-radius: 0.5rem;
  overflow-x: auto;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
  line-height: 1.5;
  margin-top: 0.75rem;
}
.modal .modal-body .principle-section pre code, .modal .modal-body .pattern-example pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

.error-demo-container {
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  background: white;
  border-radius: 0.625rem;
  padding: 1.25rem;
  margin: 1.25rem 0;
}
.error-demo-container .demo-controls {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
}
@media (max-width: 576px) {
  .error-demo-container .demo-controls {
    flex-direction: column;
  }
}
.error-demo-container .demo-output {
  padding: 1rem;
  background: #2c3e50;
  color: #ecf0f1;
  border-radius: 0.5rem;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
  line-height: 1.5;
  min-height: 150px;
  white-space: pre-wrap;
  overflow-x: auto;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: scale(0.9) translateY(-20px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}
@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin: 1.5rem 0;
}
@media (max-width: 768px) {
  .comparison-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}

.comparison-card {
  background: #ffffff;
  border-radius: 0.625rem;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
}
.comparison-card:hover {
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}
.comparison-card .card-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid #e9ecef;
}
.comparison-card .card-header h4 {
  margin: 0;
  color: #000000;
}
.comparison-card .card-header i {
  color: #4CAF50;
  font-size: 1.25rem;
}
.comparison-card .code-container {
  margin: 1rem 0;
}
.comparison-card .pros-cons {
  margin-top: 1rem;
}
.comparison-card .pros-cons .pros, .comparison-card .pros-cons .cons {
  margin-bottom: 0.75rem;
}
.comparison-card .pros-cons .pros h5, .comparison-card .pros-cons .cons h5 {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.comparison-card .pros-cons .pros ul, .comparison-card .pros-cons .cons ul {
  margin: 0;
  padding-left: 1rem;
}
.comparison-card .pros-cons .pros ul li, .comparison-card .pros-cons .cons ul li {
  font-size: 0.875rem;
  color: #000000;
  margin-bottom: 0.25rem;
}
.comparison-card .pros-cons .pros h5 {
  color: #28a745;
}
.comparison-card .pros-cons .cons h5 {
  color: #dc3545;
}

.http-methods {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.method-card {
  background: #ffffff;
  border-radius: 0.625rem;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
}
.method-card:hover {
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}
.method-card .method-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}
.method-card .method-header h4 {
  margin: 0;
  color: #000000;
}
.method-card .method-header .method-tag {
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.method-card .method-header .method-tag.get {
  background: rgba(40, 167, 69, 0.1);
  color: #28a745;
  border: 1px solid rgba(40, 167, 69, 0.3);
}
.method-card .method-header .method-tag.post {
  background: rgba(76, 175, 80, 0.1);
  color: #4CAF50;
  border: 1px solid rgba(76, 175, 80, 0.3);
}
.method-card .method-header .method-tag.put {
  background: rgba(255, 193, 7, 0.1);
  color: #ffc107;
  border: 1px solid rgba(255, 193, 7, 0.3);
}
.method-card .method-header .method-tag.delete {
  background: rgba(220, 53, 69, 0.1);
  color: #dc3545;
  border: 1px solid rgba(220, 53, 69, 0.3);
}
.method-card .method-description {
  color: #000000;
  margin-bottom: 1rem;
  font-size: 0.875rem;
}
.method-card .method-demo {
  border-top: 1px solid #e9ecef;
  padding-top: 1rem;
  margin-top: 1rem;
}
.method-card .method-demo .form-control {
  margin-bottom: 0.75rem;
  padding: 0.5rem;
  border: 1px solid #e9ecef;
  border-radius: 0.25rem;
  font-size: 0.875rem;
  width: 100%;
}
.method-card .method-demo .form-control:focus {
  outline: none;
  border-color: #4CAF50;
  box-shadow: 0 0 0 2px rgba(76, 175, 80, 0.1);
}
.method-card .method-demo .demo-output {
  background: #e9ecef;
  border: 1px solid #e9ecef;
  border-radius: 0.25rem;
  padding: 1rem;
  margin-top: 0.75rem;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
  color: #000000;
  white-space: pre-wrap;
  min-height: 100px;
}

.error-handling-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.error-card {
  background: #ffffff;
  border-radius: 0.625rem;
  padding: 1.25rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  border: 1px solid #e9ecef;
}
.error-card h5 {
  color: #000000;
  margin-bottom: 1rem;
  font-size: 1.125rem;
  font-weight: 600;
}
.error-card .code-block {
  margin: 1rem 0;
}

.real-world-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.app-card {
  background: #ffffff;
  border-radius: 0.625rem;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
}
.app-card:hover {
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}
.app-card .app-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  background: rgba(76, 175, 80, 0.1);
  border-radius: 50%;
  margin-bottom: 1rem;
}
.app-card .app-icon i {
  font-size: 1.5rem;
  color: #4CAF50;
}
.app-card h4 {
  color: #000000;
  margin-bottom: 0.75rem;
}
.app-card p {
  color: #000000;
  margin-bottom: 1rem;
  font-size: 0.875rem;
}
.app-card .app-demo {
  border-top: 1px solid #e9ecef;
  padding-top: 1rem;
  margin-top: 1rem;
}
.app-card .app-demo .form-control {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid #e9ecef;
  border-radius: 0.25rem;
  font-size: 0.875rem;
  margin-bottom: 0.75rem;
}
.app-card .app-demo .form-control:focus {
  outline: none;
  border-color: #4CAF50;
  box-shadow: 0 0 0 2px rgba(76, 175, 80, 0.1);
}
.app-card .app-demo .search-results, .app-card .app-demo .scroll-container, .app-card .app-demo .form-feedback, .app-card .app-demo .realtime-display {
  background: #e9ecef;
  border: 1px solid #e9ecef;
  border-radius: 0.25rem;
  padding: 1rem;
  margin-top: 0.75rem;
  min-height: 100px;
}
.app-card .app-demo .ajax-form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.app-card .app-demo .ajax-form input {
  padding: 0.5rem;
  border: 1px solid #e9ecef;
  border-radius: 0.25rem;
}
.app-card .app-demo .ajax-form input:focus {
  outline: none;
  border-color: #4CAF50;
  box-shadow: 0 0 0 2px rgba(76, 175, 80, 0.1);
}
.app-card .app-demo .ajax-form button {
  align-self: flex-start;
}
.app-card .app-demo .realtime-controls {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}
.app-card .app-demo .update-item {
  background: #ffffff;
  border-left: 3px solid #4CAF50;
  padding: 0.75rem;
  border-radius: 0.25rem;
  line-height: 1.8;
}
.app-card .app-demo .update-item strong {
  color: #4CAF50;
  font-weight: 600;
}

.loading-spinner {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  color: #000000;
}
.loading-spinner i {
  margin-right: 0.5rem;
  animation: spin 1s linear infinite;
}

.card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  background: rgba(76, 175, 80, 0.1);
  border-radius: 50%;
  margin-bottom: 1rem;
}
.card-icon i {
  font-size: 1.25rem;
  color: #4CAF50;
}
.card-icon.documentation {
  background: rgba(23, 162, 184, 0.1);
}
.card-icon.documentation i {
  color: #17a2b8;
}

.resource-grid {
  display: grid;
  gap: 1.5rem;
  margin: 1.5rem 0;
}
.resource-grid.two-column {
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
}
@media (max-width: 768px) {
  .resource-grid {
    grid-template-columns: 1fr;
  }
}

.resource-card {
  background: #ffffff;
  border-radius: 0.625rem;
  overflow: hidden;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
}
.resource-card:hover {
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}
.resource-card .card-thumbnail {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 120px;
  background: linear-gradient(135deg, rgba(76, 175, 80, 0.1), rgba(76, 175, 80, 0.05));
}
.resource-card .card-thumbnail .thumbnail-icon {
  font-size: 3rem;
  color: #4CAF50;
  opacity: 0.7;
}
.resource-card .card-thumbnail .thumbnail-icon.documentation {
  color: #17a2b8;
}
.resource-card .card-body {
  padding: 1.5rem;
}
.resource-card .card-header {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
}
.resource-card .card-header .card-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  margin: 0;
}
.resource-card .card-header .card-meta {
  flex: 1;
}
.resource-card .card-header .card-meta .card-title {
  margin: 0 0 0.25rem 0;
  font-size: 1.125rem;
  color: #000000;
}
.resource-card .card-header .card-meta .card-subtitle {
  display: flex;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: #000000;
}
.resource-card .card-header .card-meta .card-subtitle .author {
  font-weight: 500;
}
.resource-card .card-header .card-meta .card-subtitle .platform {
  opacity: 0.7;
}
.resource-card .card-description {
  color: #000000;
  font-size: 0.875rem;
  line-height: 1.625;
  margin-bottom: 1rem;
}
.resource-card .card-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.resource-card .card-actions .bookmark-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: #000000;
  border-radius: 0.25rem;
  transition: all 0.15s ease;
}
.resource-card .card-actions .bookmark-btn:hover {
  color: #4CAF50;
  background: rgba(76, 175, 80, 0.1);
}
.resource-card .card-actions .bookmark-btn.bookmarked {
  color: #ffc107;
}

.placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  color: #000000;
  font-style: italic;
  background: #e9ecef;
  border: 2px dashed #e9ecef;
  border-radius: 0.625rem;
  text-align: center;
}
.placeholder i {
  margin-right: 0.5rem;
  font-size: 1.125rem;
  opacity: 0.7;
}

.code-container {
  margin: 1rem 0;
  border-radius: 0.5rem;
  overflow: hidden;
  background: #2c3e50;
}
.code-container pre {
  margin: 0;
  padding: 1rem;
  background: transparent;
}

.scroll-container {
  max-height: 300px;
  overflow-y: auto;
  border: 1px solid #e9ecef;
  border-radius: 0.5rem;
  background: #e9ecef;
}
.scroll-container .scroll-content {
  padding: 1rem;
}

.details-container {
  background: #ffffff;
  border: 1px solid #e9ecef;
  border-radius: 0.625rem;
  padding: 1.5rem;
  margin: 1rem 0;
}

.design-preview-container {
  background: #e9ecef;
  border: 1px solid #e9ecef;
  border-radius: 0.625rem;
  padding: 1.5rem;
  margin: 1rem 0;
  text-align: center;
}

.card-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin: 1rem 0;
}

.analysis-container {
  background: #ffffff;
  border: 1px solid #e9ecef;
  border-radius: 0.625rem;
  padding: 1.5rem;
  margin: 1rem 0;
}

.pattern-content-container {
  background: #e9ecef;
  border-radius: 0.625rem;
  padding: 1.5rem;
  margin: 1rem 0;
}

.breadcrumb-container {
  background: #ffffff;
  border: 1px solid #e9ecef;
  border-radius: 0.5rem;
  padding: 1rem;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
}

.progress-bar-container {
  background: #e9ecef;
  border-radius: 0.5rem;
  padding: 0.5rem;
  margin: 0.75rem 0;
}

.form-select {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid #e9ecef;
  border-radius: 0.25rem;
  font-size: 0.875rem;
  background: #ffffff;
}
.form-select:focus {
  outline: none;
  border-color: #4CAF50;
  box-shadow: 0 0 0 2px rgba(76, 175, 80, 0.1);
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.badge.badge-primary {
  background: #4CAF50;
  color: white;
}
.badge.badge-secondary {
  background: #2196F3;
  color: white;
}
.badge.badge-success {
  background: #28a745;
  color: white;
}
.badge.badge-warning {
  background: #ffc107;
  color: white;
}
.badge.badge-danger {
  background: #dc3545;
  color: white;
}
.badge.badge-info {
  background: #17a2b8;
  color: white;
}
.badge.badge-light {
  background: #e9ecef;
  color: #000000;
  border: 1px solid #e9ecef;
}
.badge.badge-html {
  background: #e34c26;
  color: white;
}
.badge.badge-css {
  background: #1572b6;
  color: white;
}
.badge.badge-js {
  background: #f7df1e;
  color: #000;
}
.badge.badge-beginner {
  background: rgba(40, 167, 69, 0.1);
  color: #28a745;
  border: 1px solid rgba(40, 167, 69, 0.3);
}
.badge.badge-intermediate {
  background: rgba(255, 193, 7, 0.1);
  color: #ffc107;
  border: 1px solid rgba(255, 193, 7, 0.3);
}
.badge.badge-advanced {
  background: rgba(220, 53, 69, 0.1);
  color: #dc3545;
  border: 1px solid rgba(220, 53, 69, 0.3);
}

.text-center {
  text-align: center !important;
}

.text-success {
  color: #28a745 !important;
}

.text-white {
  color: white !important;
}

.bg-light {
  background-color: #e9ecef !important;
}

.d-flex {
  display: flex !important;
}

.justify-content-center {
  justify-content: center !important;
}

.align-items-center {
  align-items: center !important;
}

.mb-2 {
  margin-bottom: 0.5rem !important;
}

.mb-3 {
  margin-bottom: 1rem !important;
}

@media (max-width: 992px) {
  .mb-lg-0 {
    margin-bottom: 0 !important;
  }
}

.mt-2 {
  margin-top: 0.5rem !important;
}

.mt-3 {
  margin-top: 1rem !important;
}

.me-auto {
  margin-right: auto !important;
}

.protocol-simulator {
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 1.5rem;
  background: #f9f9f9;
  margin: 1rem 0;
}
.protocol-simulator .request-builder {
  background: white;
  border: 1px solid #e1e5e9;
  border-radius: 6px;
  padding: 1.25rem;
  margin-bottom: 1rem;
}
.protocol-simulator .request-builder h4 {
  margin: 0 0 1rem 0;
  color: #2c3e50;
  font-size: 1.1rem;
  font-weight: 600;
}
.protocol-simulator .request-builder .form-group {
  margin-bottom: 1rem;
}
.protocol-simulator .request-builder .input-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.protocol-simulator .request-builder .input-group label {
  font-weight: 500;
  color: #495057;
  font-size: 0.9rem;
}
.protocol-simulator .request-builder .input-group input, .protocol-simulator .request-builder .input-group select, .protocol-simulator .request-builder .input-group textarea {
  border: 1px solid #ced4da;
  border-radius: 4px;
  padding: 0.5rem 0.75rem;
  font-size: 0.9rem;
  transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}
.protocol-simulator .request-builder .input-group input:focus, .protocol-simulator .request-builder .input-group select:focus, .protocol-simulator .request-builder .input-group textarea:focus {
  outline: 0;
  border-color: #80bdff;
  box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}
.protocol-simulator .request-builder .input-group textarea {
  font-family: "Monaco", "Menlo", "Ubuntu Mono", monospace;
  font-size: 0.85rem;
  line-height: 1.4;
  resize: vertical;
}
.protocol-simulator .request-preview {
  background: white;
  border: 1px solid #e1e5e9;
  border-radius: 6px;
  padding: 1.25rem;
  margin-bottom: 1rem;
}
.protocol-simulator .request-preview h4 {
  margin: 0 0 1rem 0;
  color: #2c3e50;
  font-size: 1.1rem;
  font-weight: 600;
}
.protocol-simulator .request-preview .code-editor {
  background: #f8f9fa;
  border: 1px solid #e9ecef;
  border-radius: 4px;
  overflow: auto;
}
.protocol-simulator .request-preview .code-editor pre {
  margin: 0;
  padding: 1rem;
  font-size: 0.85rem;
  line-height: 1.4;
  white-space: pre-wrap;
  word-wrap: break-word;
}
.protocol-simulator .demo-controls {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
}
.protocol-simulator .demo-controls .btn-primary, .protocol-simulator .demo-controls .btn-secondary {
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 4px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.protocol-simulator .demo-controls .btn-primary i, .protocol-simulator .demo-controls .btn-secondary i {
  font-size: 0.85rem;
}
.protocol-simulator .demo-controls .btn-primary {
  background: #007bff;
  color: white;
}
.protocol-simulator .demo-controls .btn-primary:hover {
  background: #0056b3;
  transform: translateY(-1px);
}
.protocol-simulator .demo-controls .btn-secondary {
  background: #6c757d;
  color: white;
}
.protocol-simulator .demo-controls .btn-secondary:hover {
  background: #545b62;
  transform: translateY(-1px);
}
.protocol-simulator .response-display {
  background: white;
  border: 1px solid #e1e5e9;
  border-radius: 6px;
  padding: 1.25rem;
}
.protocol-simulator .response-display h4 {
  margin: 0 0 1rem 0;
  color: #2c3e50;
  font-size: 1.1rem;
  font-weight: 600;
}
.protocol-simulator .response-display .status-code {
  padding: 0.75rem 1rem;
  border-radius: 4px;
  margin-bottom: 1rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.protocol-simulator .response-display .status-code.success {
  background: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}
.protocol-simulator .response-display .status-code.error {
  background: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}
.protocol-simulator .response-display .status-code.info {
  background: #d1ecf1;
  color: #0c5460;
  border: 1px solid #bee5eb;
}
.protocol-simulator .response-display .status-loading {
  padding: 0.75rem 1rem;
  background: #fff3cd;
  color: #856404;
  border: 1px solid #ffeaa7;
  border-radius: 4px;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.protocol-simulator .response-display .response-headers, .protocol-simulator .response-display .response-body {
  margin-bottom: 1rem;
}
.protocol-simulator .response-display .response-headers h5, .protocol-simulator .response-display .response-body h5 {
  margin: 0 0 0.5rem 0;
  color: #495057;
  font-size: 0.95rem;
  font-weight: 600;
}
.protocol-simulator .response-display .response-headers .headers-content, .protocol-simulator .response-display .response-body .headers-content {
  background: #f8f9fa;
  border: 1px solid #e9ecef;
  border-radius: 4px;
  padding: 0.75rem;
  font-family: "Monaco", "Menlo", "Ubuntu Mono", monospace;
  font-size: 0.8rem;
  line-height: 1.4;
}
.protocol-simulator .response-display .response-headers .headers-content .header-line, .protocol-simulator .response-display .response-body .headers-content .header-line {
  margin-bottom: 0.25rem;
  color: #495057;
}
.protocol-simulator .response-display .response-headers .body-content, .protocol-simulator .response-display .response-body .body-content {
  background: #f8f9fa;
  border: 1px solid #e9ecef;
  border-radius: 4px;
  overflow: auto;
}
.protocol-simulator .response-display .response-headers .body-content pre, .protocol-simulator .response-display .response-body .body-content pre {
  margin: 0;
  padding: 0.75rem;
  font-size: 0.8rem;
  line-height: 1.4;
  white-space: pre-wrap;
  word-wrap: break-word;
}
.protocol-simulator .response-display .response-headers .body-content pre code, .protocol-simulator .response-display .response-body .body-content pre code {
  background: none;
  padding: 0;
  color: inherit;
}

@media (prefers-color-scheme: dark) {
  .protocol-simulator {
    background: #2c3e50;
    border-color: #34495e;
  }
  .protocol-simulator .request-builder, .protocol-simulator .request-preview, .protocol-simulator .response-display {
    background: #34495e;
    border-color: #4a5d72;
  }
  .protocol-simulator .request-builder h4, .protocol-simulator .request-preview h4, .protocol-simulator .response-display h4 {
    color: #ecf0f1;
  }
  .protocol-simulator .request-builder .input-group label, .protocol-simulator .request-preview .input-group label, .protocol-simulator .response-display .input-group label {
    color: #bdc3c7;
  }
  .protocol-simulator .request-builder .input-group input, .protocol-simulator .request-builder .input-group select, .protocol-simulator .request-builder .input-group textarea, .protocol-simulator .request-preview .input-group input, .protocol-simulator .request-preview .input-group select, .protocol-simulator .request-preview .input-group textarea, .protocol-simulator .response-display .input-group input, .protocol-simulator .response-display .input-group select, .protocol-simulator .response-display .input-group textarea {
    background: #2c3e50;
    border-color: #4a5d72;
    color: #ecf0f1;
  }
  .protocol-simulator .request-builder .input-group input:focus, .protocol-simulator .request-builder .input-group select:focus, .protocol-simulator .request-builder .input-group textarea:focus, .protocol-simulator .request-preview .input-group input:focus, .protocol-simulator .request-preview .input-group select:focus, .protocol-simulator .request-preview .input-group textarea:focus, .protocol-simulator .response-display .input-group input:focus, .protocol-simulator .response-display .input-group select:focus, .protocol-simulator .response-display .input-group textarea:focus {
    border-color: #3498db;
    box-shadow: 0 0 0 0.2rem rgba(52, 152, 219, 0.25);
  }
  .protocol-simulator .request-builder .code-editor, .protocol-simulator .request-builder .headers-content, .protocol-simulator .request-builder .body-content, .protocol-simulator .request-preview .code-editor, .protocol-simulator .request-preview .headers-content, .protocol-simulator .request-preview .body-content, .protocol-simulator .response-display .code-editor, .protocol-simulator .response-display .headers-content, .protocol-simulator .response-display .body-content {
    background: #2c3e50;
    border-color: #4a5d72;
  }
  .protocol-simulator .request-builder .code-editor pre, .protocol-simulator .request-builder .code-editor .header-line, .protocol-simulator .request-builder .headers-content pre, .protocol-simulator .request-builder .headers-content .header-line, .protocol-simulator .request-builder .body-content pre, .protocol-simulator .request-builder .body-content .header-line, .protocol-simulator .request-preview .code-editor pre, .protocol-simulator .request-preview .code-editor .header-line, .protocol-simulator .request-preview .headers-content pre, .protocol-simulator .request-preview .headers-content .header-line, .protocol-simulator .request-preview .body-content pre, .protocol-simulator .request-preview .body-content .header-line, .protocol-simulator .response-display .code-editor pre, .protocol-simulator .response-display .code-editor .header-line, .protocol-simulator .response-display .headers-content pre, .protocol-simulator .response-display .headers-content .header-line, .protocol-simulator .response-display .body-content pre, .protocol-simulator .response-display .body-content .header-line {
    color: #ecf0f1;
  }
  .protocol-simulator .demo-controls .btn-primary:hover {
    background: #2980b9;
  }
  .protocol-simulator .demo-controls .btn-secondary:hover {
    background: #5a6c7d;
  }
  .protocol-simulator .response-display .status-code.success {
    background: #27ae60;
    color: #ecf0f1;
    border-color: #2ecc71;
  }
  .protocol-simulator .response-display .status-code.error {
    background: #e74c3c;
    color: #ecf0f1;
    border-color: #c0392b;
  }
  .protocol-simulator .response-display .status-code.info {
    background: #3498db;
    color: #ecf0f1;
    border-color: #2980b9;
  }
  .protocol-simulator .response-display .status-loading {
    background: #f39c12;
    color: #ecf0f1;
    border-color: #e67e22;
  }
}
.calculator-exercise .element-properties {
  background: rgba(76, 175, 80, 0.05);
  padding: 1rem;
  border-radius: 0.5rem;
  margin-bottom: 1rem;
}
.calculator-exercise .element-properties .property-item {
  padding: 0.5rem 0.75rem;
  margin-bottom: 0.5rem;
  background: white;
  border-radius: 0.25rem;
  border-left: 4px solid #4CAF50;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
}
.calculator-exercise .element-properties .property-item:last-child {
  margin-bottom: 0;
}
.calculator-exercise .calculator-inputs {
  display: grid;
  gap: 1rem;
}
@media (max-width: 576px) {
  .calculator-exercise .calculator-inputs {
    gap: 0.75rem;
  }
}
.calculator-exercise .calculator-inputs .form-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
@media (max-width: 576px) {
  .calculator-exercise .calculator-inputs .form-group {
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
  }
}
.calculator-exercise .calculator-inputs .form-group label {
  font-weight: 500;
  min-width: 120px;
  color: #000000;
}
@media (max-width: 576px) {
  .calculator-exercise .calculator-inputs .form-group label {
    min-width: auto;
  }
}
.calculator-exercise .calculator-inputs .form-group input {
  flex: 1;
  max-width: 150px;
}
@media (max-width: 576px) {
  .calculator-exercise .calculator-inputs .form-group input {
    max-width: none;
  }
}
.calculator-exercise .demo-result {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: 0.5rem;
}
.calculator-exercise .demo-result.success {
  background: rgba(40, 167, 69, 0.1);
  border: 1px solid rgba(40, 167, 69, 0.3);
  color: rgb(32, 133.6, 55.2);
}
.calculator-exercise .demo-result.success i {
  color: #28a745;
  margin-right: 0.5rem;
}
.calculator-exercise .demo-result.warning {
  background: rgba(255, 193, 7, 0.1);
  border: 1px solid rgba(255, 193, 7, 0.3);
  color: rgb(183.4, 137.55, 0);
}
.calculator-exercise .demo-result.warning i {
  color: #ffc107;
  margin-right: 0.5rem;
}
.calculator-exercise .demo-result.error {
  background: rgba(220, 53, 69, 0.1);
  border: 1px solid rgba(220, 53, 69, 0.3);
  color: rgb(209.4151898734, 36.2848101266, 52.8721518987);
}
.calculator-exercise .demo-result.error i {
  color: #dc3545;
  margin-right: 0.5rem;
}
.calculator-exercise .demo-result .success-message,
.calculator-exercise .demo-result .warning-message,
.calculator-exercise .demo-result .error-message {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}
.calculator-exercise .demo-result .success-message strong,
.calculator-exercise .demo-result .warning-message strong,
.calculator-exercise .demo-result .error-message strong {
  display: block;
  margin-bottom: 0.25rem;
}
.calculator-exercise .demo-result .success-message small,
.calculator-exercise .demo-result .warning-message small,
.calculator-exercise .demo-result .error-message small {
  opacity: 0.8;
  font-size: 0.75rem;
}

.live-editor {
  border: 1px solid #e9ecef;
  border-radius: 0.5rem;
  overflow: hidden;
}
.live-editor .editor-tabs {
  display: flex;
  background: #f8f9fa;
  border-bottom: 1px solid #e9ecef;
}
.live-editor .editor-tabs .tab-btn {
  padding: 0.75rem 1rem;
  background: transparent;
  border: none;
  color: #000000;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  border-bottom: 3px solid transparent;
}
.live-editor .editor-tabs .tab-btn:hover {
  background: rgba(76, 175, 80, 0.1);
  color: #4CAF50;
}
.live-editor .editor-tabs .tab-btn.active {
  background: white;
  color: #4CAF50;
  border-bottom-color: #4CAF50;
}
.live-editor .editor-content {
  position: relative;
  min-height: 300px;
}
.live-editor .editor-content .tab-pane {
  display: none;
  padding: 1rem;
}
.live-editor .editor-content .tab-pane.active {
  display: block;
}
.live-editor .editor-content textarea {
  width: 100%;
  min-height: 200px;
  padding: 0.75rem;
  border: none;
  border-radius: 0;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
  line-height: 1.5;
  background: #34495e;
  color: #ecf0f1;
  resize: vertical;
}
.live-editor .editor-content textarea:focus {
  outline: none;
  box-shadow: inset 0 0 0 2px #4CAF50;
}
.live-editor .editor-content .preview-area {
  min-height: 200px;
  background: #e9ecef;
  border-radius: 0.25rem;
  padding: 1rem;
}
.live-editor .update-message {
  margin: 0.75rem 0;
  padding: 0.5rem 0.75rem;
  border-radius: 0.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  animation: slideIn 0.3s ease;
}
.live-editor .update-message.success-message {
  background: rgba(40, 167, 69, 0.1);
  color: #28a745;
  border: 1px solid rgba(40, 167, 69, 0.3);
}
.live-editor .update-message.error-message {
  background: rgba(220, 53, 69, 0.1);
  color: #dc3545;
  border: 1px solid rgba(220, 53, 69, 0.3);
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.diagram-container {
  text-align: center;
}
.diagram-container .box-model-diagram {
  display: inline-block;
  margin: 1rem 0;
}
.diagram-container .margin-demo {
  padding: 20px;
  background: rgba(255, 193, 7, 0.2);
  border: 2px dashed #ffc107;
  position: relative;
}
.diagram-container .margin-demo .margin-label {
  position: absolute;
  top: 2px;
  left: 2px;
  font-size: 0.75rem;
  font-weight: 600;
  color: #ffc107;
}
.diagram-container .border-demo {
  padding: 15px;
  background: rgba(220, 53, 69, 0.2);
  border: 3px solid #dc3545;
  position: relative;
}
.diagram-container .border-demo .border-label {
  position: absolute;
  top: 2px;
  left: 2px;
  font-size: 0.75rem;
  font-weight: 600;
  color: #dc3545;
}
.diagram-container .padding-demo {
  padding: 20px;
  background: rgba(23, 162, 184, 0.2);
  border: 2px solid #17a2b8;
  position: relative;
}
.diagram-container .padding-demo .padding-label {
  position: absolute;
  top: 2px;
  left: 2px;
  font-size: 0.75rem;
  font-weight: 600;
  color: #17a2b8;
}
.diagram-container .content-demo {
  padding: 30px;
  background: rgba(76, 175, 80, 0.2);
  border: 2px solid #4CAF50;
  position: relative;
  color: #4CAF50;
  font-weight: 600;
}
.diagram-container .content-demo .content-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: #4CAF50;
}

.flex-container {
  min-height: 200px;
  border: 2px dashed #e0e0e0;
  border-radius: 8px;
  padding: 16px;
  margin: 16px 0;
  background: #f8f9fa;
  transition: all 0.3s ease;
}
.flex-container .flex-item {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 60px;
  min-height: 60px;
  color: white;
  font-weight: bold;
  font-size: 18px;
  border-radius: 4px;
  margin: 4px;
  transition: all 0.3s ease;
  flex-shrink: 0;
}
.flex-container .flex-item:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.grid-container {
  min-height: 200px;
  border: 2px dashed #e0e0e0;
  border-radius: 8px;
  padding: 16px;
  margin: 16px 0;
  background: #f8f9fa;
  transition: all 0.3s ease;
}
.grid-container .grid-item {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60px;
  color: white;
  font-weight: bold;
  font-size: 18px;
  border-radius: 4px;
  transition: all 0.3s ease;
}
.grid-container .grid-item:hover {
  transform: scale(1.02);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.demo-controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
  padding: 16px;
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}
.demo-controls .form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.demo-controls .form-group label {
  font-weight: 600;
  color: #000000;
  font-size: 0.875rem;
}
.demo-controls .form-group .form-select {
  padding: 8px 12px;
  border: 1px solid #ddd;
  border-radius: 4px;
  background: white;
  font-size: 0.875rem;
  transition: border-color 0.3s ease;
}
.demo-controls .form-group .form-select:focus {
  outline: none;
  border-color: #4CAF50;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.demo-controls .form-group input[type=range] {
  width: 100%;
  margin: 4px 0;
}
.demo-controls .form-group span {
  font-size: 0.875rem;
  color: #000000;
  font-weight: 500;
}

.holy-grail-demo {
  display: grid;
  grid-template-areas: "header header header" "nav main aside" "footer footer footer";
  grid-template-rows: auto 1fr auto;
  grid-template-columns: 100px 1fr 100px;
  height: 200px;
  gap: 4px;
  font-size: 12px;
}
.holy-grail-demo .header {
  grid-area: header;
  background: #3498db;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
}
.holy-grail-demo .nav {
  grid-area: nav;
  background: #e74c3c;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
}
.holy-grail-demo .main {
  grid-area: main;
  background: #2ecc71;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
}
.holy-grail-demo .aside {
  grid-area: aside;
  background: #f39c12;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
}
.holy-grail-demo .footer {
  grid-area: footer;
  background: #9b59b6;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
}

.card-grid-demo {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
  gap: 8px;
}
.card-grid-demo .card {
  background: #ecf0f1;
  padding: 16px 8px;
  border-radius: 4px;
  text-align: center;
  font-size: 10px;
  border: 1px solid #bdc3c7;
  transition: all 0.3s ease;
}
.card-grid-demo .card:hover {
  background: #d5dbdb;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.calculator-container {
  max-width: 320px;
  margin: 0 auto;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 20px;
  padding: 25px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
  position: relative;
}
.calculator-container::before {
  content: "";
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 2px;
}

.calculator-display {
  background: rgba(255, 255, 255, 0.95);
  border-radius: 15px;
  padding: 20px;
  margin-bottom: 20px;
  font-family: "Courier New", monospace;
  font-size: 28px;
  font-weight: bold;
  text-align: right;
  color: #2c3e50;
  min-height: 60px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  box-shadow: inset 0 4px 8px rgba(0, 0, 0, 0.1);
  border: 2px solid rgba(255, 255, 255, 0.2);
  word-break: break-all;
  overflow-wrap: break-word;
}

.calculator-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.calc-btn {
  height: 60px;
  border: none;
  border-radius: 12px;
  font-size: 20px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}
.calc-btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s;
}
.calc-btn:hover::before {
  left: 100%;
}
.calc-btn:active {
  transform: scale(0.95);
}
.calc-btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.3);
}

.calc-number {
  background: rgba(255, 255, 255, 0.9);
  color: #2c3e50;
}
.calc-number:hover {
  background: rgb(255, 255, 255);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.calc-operator {
  background: rgba(255, 165, 0, 0.9);
  color: white;
}
.calc-operator:hover {
  background: rgb(255, 165, 0);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(255, 165, 0, 0.3);
}

.calc-equals {
  background: linear-gradient(135deg, #ff6b6b, #ee5a24);
  color: white;
  grid-row: span 2;
}
.calc-equals:hover {
  background: linear-gradient(135deg, #ff5252, #d84315);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(255, 107, 107, 0.4);
}

.calc-clear {
  background: linear-gradient(135deg, #ff7675, #d63031);
  color: white;
}
.calc-clear:hover {
  background: linear-gradient(135deg, #ff5252, #b71c1c);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(255, 118, 117, 0.4);
}

.calc-zero {
  grid-column: span 2;
}

.calculator-info {
  margin-top: 25px;
  padding: 20px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.2);
}
.calculator-info h4 {
  color: #2c3e50;
  margin-bottom: 15px;
  font-size: 16px;
}
.calculator-info .feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.calculator-info .feature-list li {
  color: #34495e;
  margin-bottom: 8px;
  padding-left: 20px;
  position: relative;
  font-size: 14px;
  line-height: 1.4;
}
.calculator-info .feature-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: #3498db;
  font-weight: bold;
}
.calculator-info .feature-list li strong {
  color: #2c3e50;
  font-weight: 600;
}
.calculator-info .tip-box {
  margin-top: 15px;
  padding: 12px 15px;
  background: rgba(255, 235, 59, 0.2);
  border: 1px solid rgba(255, 235, 59, 0.3);
  border-radius: 8px;
  color: #2c3e50;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.calculator-info .tip-box i {
  color: #f39c12;
  font-size: 16px;
}
.calculator-info .tip-box strong {
  color: #e67e22;
}

.key-concepts {
  margin: 30px 0;
}
.key-concepts h3 {
  color: #4CAF50;
  margin-bottom: 20px;
  font-size: 18px;
}

.concept-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 15px;
  margin-top: 15px;
}

.concept-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px;
  background: rgba(76, 175, 80, 0.05);
  border-radius: 8px;
  border-left: 4px solid #4CAF50;
  transition: all 0.3s ease;
}
.concept-item:hover {
  background: rgba(76, 175, 80, 0.1);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(76, 175, 80, 0.15);
}
.concept-item i {
  color: #4CAF50;
  font-size: 20px;
  min-width: 20px;
}
.concept-item strong {
  color: #000000;
  margin-right: 8px;
}

@media (max-width: 576px) {
  .calculator-container {
    max-width: 280px;
    padding: 20px;
  }
  .calculator-display {
    font-size: 24px;
    padding: 15px;
    min-height: 50px;
  }
  .calc-btn {
    height: 50px;
    font-size: 18px;
  }
  .calculator-info {
    padding: 15px;
  }
  .calculator-info .feature-list li {
    font-size: 13px;
  }
}
.selector-highlight {
  background-color: rgba(255, 193, 7, 0.3) !important;
  border: 2px solid #ffc107 !important;
  box-shadow: 0 0 10px rgba(255, 193, 7, 0.5);
}

.event-log {
  max-height: 300px;
  overflow-y: auto;
  border: 1px solid #e9ecef;
  border-radius: 0.5rem;
  padding: 0.75rem;
}
.event-log .log-entry {
  padding: 0.5rem 0.75rem;
  margin-bottom: 0.5rem;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 0.25rem;
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
  border-left: 3px solid #4CAF50;
}
.event-log .log-entry:last-child {
  margin-bottom: 0;
}
.event-log .log-entry strong {
  color: #4CAF50;
}
.event-log .log-entry small {
  color: #495057;
  font-size: 0.75rem;
}

.hover-box {
  padding: 1.25rem;
  background: #4CAF50;
  color: white;
  border-radius: 0.5rem;
  text-align: center;
  cursor: pointer;
  transition: background-color 0.2s ease;
  font-weight: 500;
}
.hover-box:hover {
  background: rgb(60.5577689243, 139.4422310757, 63.7450199203);
}

.style-box {
  padding: 1.25rem;
  border-radius: 8px;
  text-align: center;
  min-height: 100px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  transition: all 0.2s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.attribute-list {
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
  background: #e9ecef;
  padding: 0.75rem;
  border-radius: 0.25rem;
  border: 1px solid #e9ecef;
}
.attribute-list div {
  margin-bottom: 0.25rem;
}
.attribute-list div:last-child {
  margin-bottom: 0;
}
.attribute-list div strong {
  color: #4CAF50;
}

.todo-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem;
  background: #e9ecef;
  border: 1px solid #e9ecef;
  border-radius: 0.25rem;
  margin-bottom: 0.5rem;
}
.todo-list li:last-child {
  margin-bottom: 0;
}
.todo-list .delete-btn {
  background: #dc3545;
  color: white;
  border: none;
  border-radius: 0.25rem;
  width: 24px;
  height: 24px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  transition: background-color 0.2s ease;
}
.todo-list .delete-btn:hover {
  background: rgb(189.2151898734, 32.7848101266, 47.7721518987);
}

.dom-tree-container {
  padding: 1rem;
  background: linear-gradient(135deg, rgba(76, 175, 80, 0.02) 0%, rgba(33, 150, 243, 0.02) 100%);
  border-radius: 0.625rem;
  border: 1px solid rgba(76, 175, 80, 0.1);
}
.dom-tree-container h4 {
  margin: 0 0 1rem 0;
  color: #000000;
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
}

.dom-tree {
  font-family: "Monaco", "Consolas", "Courier New", monospace;
  font-size: 0.875rem;
  line-height: 1.6;
  position: relative;
  padding: 0.75rem;
  background: white;
  border-radius: 0.5rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
  overflow-x: auto;
}
.dom-tree *, .dom-tree *::before, .dom-tree *::after {
  list-style: none !important;
  text-decoration: none !important;
}
.dom-tree::-webkit-scrollbar {
  height: 6px;
}
.dom-tree::-webkit-scrollbar-track {
  background: #e9ecef;
  border-radius: 0.25rem;
}
.dom-tree::-webkit-scrollbar-thumb {
  background: #e9ecef;
  border-radius: 0.25rem;
}
.dom-tree::-webkit-scrollbar-thumb:hover {
  background: #e9ecef;
}

.dom-node {
  position: relative;
  margin: 0.25rem 0;
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  transition: all 0.2s ease;
  cursor: pointer;
  list-style: none !important;
}
.dom-node.root {
  background: linear-gradient(135deg, #4CAF50 0%, rgb(60.5577689243, 139.4422310757, 63.7450199203) 100%);
  color: white;
  font-weight: 700;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  border: 2px solid rgb(52.8366533865, 121.6633466135, 55.6175298805);
}
.dom-node.root .node-label {
  color: white;
}
.dom-node.root::before {
  display: none;
}
.dom-node:not(.root) {
  background: #e9ecef;
  border: 1px solid #e9ecef;
  color: #000000;
}
.dom-node:not(.root):hover {
  background: rgb(234.4322709163, 246.0677290837, 234.9023904382);
  border-color: rgb(181.0956175299, 222.9043824701, 182.7848605578);
  transform: translateX(2px);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}
.dom-node:not(.root) .node-label[data-type=element] {
  color: #4CAF50;
  font-weight: 600;
}
.dom-node:not(.root) .node-label[data-type=text] {
  color: #28a745;
  font-style: italic;
}
.dom-node:not(.root) .node-label[data-type=attribute] {
  color: #ffc107;
  font-weight: 500;
}

.node-label {
  display: inline-block;
  padding: 2px 6px;
  background: rgba(255, 255, 255, 0.9);
  border-radius: 3px;
  font-weight: 500;
  white-space: nowrap;
  transition: all 0.2s ease;
}
.node-label::before {
  content: "<";
  opacity: 0.6;
  margin-right: 2px;
}
.node-label::after {
  content: ">";
  opacity: 0.6;
  margin-left: 2px;
}
.node-label[data-type=document]::before, .node-label[data-type=document]::after, .node-label[data-type=text]::before, .node-label[data-type=text]::after {
  display: none;
}

.dom-children {
  position: relative;
  margin-left: 1.25rem;
  padding-left: 0.75rem;
  list-style: none !important;
  border-left: none;
}
.dom-children::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, #4CAF50, rgba(76, 175, 80, 0.3));
}
.dom-children::after {
  display: none;
}

.dom-node .dom-children .dom-node {
  margin-left: 0.5rem;
}
.dom-node .dom-children .dom-node .dom-children {
  margin-left: 1rem;
}
.dom-node .dom-children .dom-node .dom-children::before {
  background: linear-gradient(to bottom, rgba(76, 175, 80, 0.6), rgba(76, 175, 80, 0.2));
}

.dom-node .dom-children .dom-node .dom-children .dom-node .dom-children {
  margin-left: 0.75rem;
}
.dom-node .dom-children .dom-node .dom-children .dom-node .dom-children::before {
  background: linear-gradient(to bottom, rgba(33, 150, 243, 0.6), rgba(33, 150, 243, 0.2));
}

.dom-node.collapsed .dom-children {
  display: none;
}

@media (max-width: 768px) {
  .dom-tree-container {
    padding: 0.75rem;
  }
  .dom-tree {
    font-size: 0.75rem;
    padding: 0.5rem;
  }
  .dom-children {
    margin-left: 1rem;
    padding-left: 0.5rem;
  }
}
@media (max-width: 576px) {
  .dom-tree-container {
    padding: 0.5rem;
  }
  .dom-tree-container h4 {
    font-size: 0.875rem;
    margin-bottom: 0.75rem;
  }
  .dom-tree {
    font-size: 11px;
    padding: 0.25rem;
  }
  .dom-node {
    padding: 0.25rem 0.5rem;
    margin: 2px 0;
  }
  .dom-node.root {
    padding: 0.5rem 0.75rem;
  }
  .dom-children {
    margin-left: 0.75rem;
    padding-left: 0.25rem;
  }
  .node-label {
    padding: 1px 4px;
    font-size: 11px;
  }
}
@media (prefers-color-scheme: dark) {
  .dom-tree-container {
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.05) 0%, rgba(33, 150, 243, 0.05) 100%);
    border-color: rgba(76, 175, 80, 0.2);
  }
  .dom-tree {
    background: #2c3e50;
  }
  .dom-node:not(.root) {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
  }
  .dom-node:not(.root):hover {
    background: rgba(76, 175, 80, 0.1);
  }
  .node-label {
    background: rgba(0, 0, 0, 0.3);
    color: white;
  }
  .dom-children::before {
    background: linear-gradient(to bottom, rgba(76, 175, 80, 0.4), rgba(76, 175, 80, 0.1));
  }
  .dom-children::after {
    display: none;
  }
}
.dom-legend {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-top: 0.75rem;
  padding: 0.5rem;
  background: rgba(255, 255, 255, 0.8);
  border-radius: 0.5rem;
  flex-wrap: wrap;
}
.dom-legend .legend-item {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.75rem;
  color: #000000;
}
.dom-legend .legend-item .legend-color {
  width: 12px;
  height: 12px;
  border-radius: 0.25rem;
}
.dom-legend .legend-item .legend-color.root {
  background: linear-gradient(135deg, #4CAF50 0%, rgb(60.5577689243, 139.4422310757, 63.7450199203) 100%);
  border: 1px solid rgb(52.8366533865, 121.6633466135, 55.6175298805);
}
.dom-legend .legend-item .legend-color.element {
  background: rgb(198.874501992, 230.625498008, 200.1573705179);
  border: 1px solid rgb(163.3167330677, 215.1832669323, 165.4123505976);
}
.dom-legend .legend-item .legend-color.text {
  background: rgb(154.5579710145, 230.9420289855, 172);
  border: 1px solid rgb(113.4130434783, 221.0869565217, 138);
}

#framework-selector-form {
  background: white;
  border-radius: 0.9375rem;
  padding: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  margin-bottom: 1.5rem;
}
@media (max-width: 768px) {
  #framework-selector-form {
    padding: 1.5rem;
  }
}
@media (max-width: 576px) {
  #framework-selector-form {
    padding: 1.25rem;
  }
}
#framework-selector-form .form-group {
  margin-bottom: 2rem;
}
#framework-selector-form .form-group:last-of-type {
  margin-bottom: 1.5rem;
}
#framework-selector-form .form-label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.125rem;
  font-weight: 600;
  color: #000000;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid #e9ecef;
}
#framework-selector-form .form-label i {
  color: #4CAF50;
  font-size: 1.25rem;
}
@media (max-width: 576px) {
  #framework-selector-form .form-label {
    font-size: 1rem;
  }
  #framework-selector-form .form-label i {
    font-size: 1.125rem;
  }
}
#framework-selector-form .radio-card-group {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
@media (max-width: 992px) {
  #framework-selector-form .radio-card-group {
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
  }
}
@media (max-width: 768px) {
  #framework-selector-form .radio-card-group {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 576px) {
  #framework-selector-form .radio-card-group {
    grid-template-columns: 1fr;
  }
}
#framework-selector-form .radio-card {
  position: relative;
  cursor: pointer;
  display: block;
  transition: all 0.3s ease;
}
#framework-selector-form .radio-card input[type=radio] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
#framework-selector-form .radio-card .card-content {
  background: white;
  border: 2px solid #e9ecef;
  border-radius: 0.625rem;
  padding: 1.25rem;
  text-align: center;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  min-height: 140px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}
#framework-selector-form .radio-card .card-content::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(76, 175, 80, 0.05), transparent);
  transition: left 0.5s ease-in-out;
}
#framework-selector-form .radio-card .card-content i {
  font-size: 1.875rem;
  color: #000000;
  transition: all 0.3s ease;
  position: relative;
  z-index: 1;
}
@media (max-width: 576px) {
  #framework-selector-form .radio-card .card-content i {
    font-size: 1.5rem;
  }
}
#framework-selector-form .radio-card .card-content h4 {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 600;
  color: #000000;
  transition: color 0.3s ease;
  position: relative;
  z-index: 1;
}
@media (max-width: 576px) {
  #framework-selector-form .radio-card .card-content h4 {
    font-size: 1rem;
  }
}
#framework-selector-form .radio-card .card-content p {
  margin: 0;
  font-size: 0.875rem;
  color: #000000;
  transition: color 0.3s ease;
  position: relative;
  z-index: 1;
}
@media (max-width: 576px) {
  #framework-selector-form .radio-card .card-content p {
    font-size: 0.75rem;
  }
}
#framework-selector-form .radio-card:hover .card-content {
  border-color: rgba(76, 175, 80, 0.5);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(76, 175, 80, 0.15);
}
#framework-selector-form .radio-card:hover .card-content::before {
  left: 100%;
}
#framework-selector-form .radio-card:hover .card-content i {
  color: #4CAF50;
  transform: scale(1.1);
}
#framework-selector-form .radio-card input[type=radio]:checked + .card-content {
  border-color: #4CAF50;
  background: linear-gradient(135deg, rgba(76, 175, 80, 0.08) 0%, rgba(76, 175, 80, 0.02) 100%);
  box-shadow: 0 6px 20px rgba(76, 175, 80, 0.25), inset 0 0 0 1px rgba(76, 175, 80, 0.1);
}
#framework-selector-form .radio-card input[type=radio]:checked + .card-content i {
  color: #4CAF50;
  transform: scale(1.15);
}
#framework-selector-form .radio-card input[type=radio]:checked + .card-content h4 {
  color: #4CAF50;
}
#framework-selector-form .radio-card input[type=radio]:checked + .card-content p {
  color: rgb(60.5577689243, 139.4422310757, 63.7450199203);
}
#framework-selector-form .radio-card input[type=radio]:checked + .card-content::after {
  content: "\f00c";
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  width: 28px;
  height: 28px;
  background: #4CAF50;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  box-shadow: 0 2px 8px rgba(76, 175, 80, 0.4);
  animation: scaleIn 0.3s ease-out;
  z-index: 2;
}
#framework-selector-form .radio-card input[type=radio]:focus + .card-content {
  outline: 2px solid #4CAF50;
  outline-offset: 2px;
}
#framework-selector-form .radio-card input[type=radio]:disabled + .card-content {
  opacity: 0.5;
  cursor: not-allowed;
  background: #e9ecef;
}
#framework-selector-form .radio-card input[type=radio]:disabled + .card-content:hover {
  border-color: #e9ecef;
  transform: none;
  box-shadow: none;
}
#framework-selector-form .button-group {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}
@media (max-width: 576px) {
  #framework-selector-form .button-group {
    flex-direction: column;
    align-items: stretch;
  }
}
#framework-selector-form .button-group .btn {
  padding: 1rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  gap: 0.75rem;
  min-width: 200px;
  transition: all 0.3s ease;
}
@media (max-width: 576px) {
  #framework-selector-form .button-group .btn {
    width: 100%;
    min-width: auto;
  }
}
#framework-selector-form .button-group .btn i {
  transition: transform 0.15s ease;
}
#framework-selector-form .button-group .btn:hover i {
  transform: scale(1.1);
}
#framework-selector-form .button-group .btn.btn-primary {
  box-shadow: 0 4px 14px rgba(76, 175, 80, 0.3);
}
#framework-selector-form .button-group .btn.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(76, 175, 80, 0.4);
}
#framework-selector-form .button-group .btn.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(76, 175, 80, 0.3);
}
#framework-selector-form .button-group .btn.btn-secondary:hover {
  background: #e9ecef;
  border-color: #ced4da;
}

#recommendation-result {
  margin-top: 2rem;
  padding: 2rem;
  background: white;
  border-radius: 0.9375rem;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  border: 2px solid #4CAF50;
  animation: slideInUp 0.5s ease-out;
  display: none;
}
#recommendation-result.show {
  display: block;
}
#recommendation-result .recommendation-header {
  text-align: center;
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 2px solid #e9ecef;
}
#recommendation-result .recommendation-header .recommendation-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 1.25rem;
  background: linear-gradient(135deg, #4CAF50, rgb(127.7589641434, 199.7410358566, 130.6673306773));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(76, 175, 80, 0.3);
}
#recommendation-result .recommendation-header .recommendation-icon i {
  font-size: 1.875rem;
  color: white;
}
#recommendation-result .recommendation-header h3 {
  margin: 0 0 0.75rem 0;
  font-size: 1.5rem;
  color: #000000;
  font-weight: 700;
}
#recommendation-result .recommendation-header p {
  margin: 0;
  font-size: 1rem;
  color: #000000;
}
#recommendation-result .recommendation-framework {
  text-align: center;
  padding: 1.5rem;
  background: linear-gradient(135deg, rgba(76, 175, 80, 0.08), rgba(76, 175, 80, 0.02));
  border-radius: 0.625rem;
  margin-bottom: 1.5rem;
}
#recommendation-result .recommendation-framework .framework-logo {
  font-size: 2.25rem;
  margin-bottom: 1rem;
}
#recommendation-result .recommendation-framework .framework-logo i {
  color: #4CAF50;
}
#recommendation-result .recommendation-framework h4 {
  margin: 0 0 0.5rem 0;
  font-size: 1.25rem;
  color: #4CAF50;
  font-weight: 700;
}
#recommendation-result .recommendation-framework .framework-tagline {
  font-size: 0.875rem;
  color: #000000;
  font-style: italic;
}
#recommendation-result .recommendation-reasons {
  margin-bottom: 1.5rem;
}
#recommendation-result .recommendation-reasons h5 {
  font-size: 1.125rem;
  font-weight: 600;
  color: #000000;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
#recommendation-result .recommendation-reasons h5 i {
  color: #28a745;
}
#recommendation-result .recommendation-reasons ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
#recommendation-result .recommendation-reasons ul li {
  padding: 0.75rem 1rem;
  margin-bottom: 0.75rem;
  background: #e9ecef;
  border-left: 4px solid #28a745;
  border-radius: 0.5rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  transition: all 0.3s ease;
}
#recommendation-result .recommendation-reasons ul li:hover {
  background: rgba(40, 167, 69, 0.1);
  transform: translateX(5px);
}
#recommendation-result .recommendation-reasons ul li::before {
  content: "\f00c";
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
  color: #28a745;
  flex-shrink: 0;
  margin-top: 2px;
}
#recommendation-result .recommendation-alternatives {
  background: rgba(23, 162, 184, 0.05);
  padding: 1.25rem;
  border-radius: 0.625rem;
  border: 1px solid rgba(23, 162, 184, 0.2);
}
#recommendation-result .recommendation-alternatives h5 {
  font-size: 1rem;
  font-weight: 600;
  color: #000000;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
#recommendation-result .recommendation-alternatives h5 i {
  color: #17a2b8;
  font-size: 0.875rem;
}
#recommendation-result .recommendation-alternatives p {
  margin: 0;
  font-size: 0.875rem;
  color: #000000;
  line-height: 1.625;
}
#recommendation-result .recommendation-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid #e9ecef;
  flex-wrap: wrap;
}
@media (max-width: 576px) {
  #recommendation-result .recommendation-actions {
    flex-direction: column;
  }
}
#recommendation-result .recommendation-actions .btn {
  padding: 0.75rem 1.5rem;
  font-size: 0.875rem;
  gap: 0.5rem;
}
@media (max-width: 576px) {
  #recommendation-result .recommendation-actions .btn {
    width: 100%;
  }
}

@keyframes scaleIn {
  0% {
    transform: scale(0);
    opacity: 0;
  }
  50% {
    transform: scale(1.2);
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}
.comparison-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin-top: 1.5rem;
  background: white;
  border-radius: 0.625rem;
  overflow: hidden;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  border: 1px solid #e9ecef;
}
.comparison-table thead {
  background: linear-gradient(135deg, #4CAF50, rgb(127.7589641434, 199.7410358566, 130.6673306773));
}
.comparison-table thead tr th {
  padding: 1.25rem;
  text-align: center;
  font-weight: 700;
  font-size: 1rem;
  color: white;
  border-right: 1px solid rgba(255, 255, 255, 0.2);
  position: relative;
}
.comparison-table thead tr th:first-child {
  text-align: left;
  font-size: 1.125rem;
}
.comparison-table thead tr th:last-child {
  border-right: none;
}
.comparison-table thead tr th .framework-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}
.comparison-table thead tr th .framework-header i {
  font-size: 1.5rem;
  margin-bottom: 0.25rem;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}
.comparison-table thead tr th.react-col {
  background: rgba(97, 218, 251, 0.15);
}
.comparison-table thead tr th.angular-col {
  background: rgba(221, 0, 49, 0.15);
}
.comparison-table thead tr th.vue-col {
  background: rgba(66, 184, 131, 0.15);
}
.comparison-table tbody tr {
  transition: background-color 0.3s ease;
  border-bottom: 1px solid #e9ecef;
}
.comparison-table tbody tr:last-child {
  border-bottom: none;
}
.comparison-table tbody tr:hover {
  background: rgba(76, 175, 80, 0.02);
}
.comparison-table tbody tr.technical-criteria, .comparison-table tbody tr.business-criteria, .comparison-table tbody tr.team-criteria {
  display: table-row;
}
.comparison-table tbody tr.hidden {
  display: none;
}
.comparison-table tbody tr td {
  padding: 1.25rem;
  border-right: 1px solid #e9ecef;
  vertical-align: middle;
}
.comparison-table tbody tr td:last-child {
  border-right: none;
}
.comparison-table tbody tr td.criteria-label {
  font-weight: 600;
  color: #000000;
  font-size: 1rem;
  background: rgba(76, 175, 80, 0.03);
  width: 200px;
}
@media (max-width: 768px) {
  .comparison-table tbody tr td.criteria-label {
    width: 150px;
    font-size: 0.875rem;
  }
}
@media (max-width: 576px) {
  .comparison-table tbody tr td.criteria-label {
    width: 120px;
  }
}
.comparison-table tbody tr td.score-cell {
  text-align: center;
}
.comparison-table tbody tr td.score-cell .score-bar {
  width: 100%;
  max-width: 200px;
  height: 8px;
  background: #e9ecef;
  border-radius: 0.25rem;
  overflow: hidden;
  margin: 0 auto 0.5rem auto;
  border: 1px solid #e9ecef;
}
@media (max-width: 768px) {
  .comparison-table tbody tr td.score-cell .score-bar {
    max-width: 150px;
  }
}
.comparison-table tbody tr td.score-cell .score-bar .score-fill {
  height: 100%;
  border-radius: 0.25rem;
  transition: width 0.8s ease-out;
}
.comparison-table tbody tr td.score-cell .score-bar .score-fill[data-score="1"], .comparison-table tbody tr td.score-cell .score-bar .score-fill[data-score="2"], .comparison-table tbody tr td.score-cell .score-bar .score-fill[data-score="3"] {
  width: calc(var(--score) * 10%);
  background: #ef4444;
}
.comparison-table tbody tr td.score-cell .score-bar .score-fill[data-score="4"], .comparison-table tbody tr td.score-cell .score-bar .score-fill[data-score="5"], .comparison-table tbody tr td.score-cell .score-bar .score-fill[data-score="6"] {
  background: #f59e0b;
}
.comparison-table tbody tr td.score-cell .score-bar .score-fill[data-score="7"], .comparison-table tbody tr td.score-cell .score-bar .score-fill[data-score="8"], .comparison-table tbody tr td.score-cell .score-bar .score-fill[data-score="9"], .comparison-table tbody tr td.score-cell .score-bar .score-fill[data-score="10"] {
  background: #10b981;
}
.comparison-table tbody tr td.score-cell .score-bar .score-fill[data-score="1"] {
  width: 10%;
}
.comparison-table tbody tr td.score-cell .score-bar .score-fill[data-score="2"] {
  width: 20%;
}
.comparison-table tbody tr td.score-cell .score-bar .score-fill[data-score="3"] {
  width: 30%;
}
.comparison-table tbody tr td.score-cell .score-bar .score-fill[data-score="4"] {
  width: 40%;
}
.comparison-table tbody tr td.score-cell .score-bar .score-fill[data-score="5"] {
  width: 50%;
}
.comparison-table tbody tr td.score-cell .score-bar .score-fill[data-score="6"] {
  width: 60%;
}
.comparison-table tbody tr td.score-cell .score-bar .score-fill[data-score="7"] {
  width: 70%;
}
.comparison-table tbody tr td.score-cell .score-bar .score-fill[data-score="8"] {
  width: 80%;
}
.comparison-table tbody tr td.score-cell .score-bar .score-fill[data-score="9"] {
  width: 90%;
}
.comparison-table tbody tr td.score-cell .score-bar .score-fill[data-score="10"] {
  width: 100%;
}
.comparison-table tbody tr td.score-cell .score-text {
  font-size: 0.875rem;
  font-weight: 500;
  color: #000000;
  display: block;
}
@media (max-width: 576px) {
  .comparison-table tbody tr td.score-cell .score-text {
    font-size: 0.75rem;
  }
}
@media (max-width: 768px) {
  .comparison-table thead tr th {
    padding: 1rem 0.75rem;
    font-size: 0.875rem;
  }
  .comparison-table thead tr th .framework-header i {
    font-size: 1.25rem;
  }
  .comparison-table tbody tr td {
    padding: 1rem 0.75rem;
  }
}
@media (max-width: 576px) {
  .comparison-table {
    display: block;
    border: none;
    box-shadow: none;
    background: transparent;
  }
  .comparison-table thead {
    display: none;
  }
  .comparison-table tbody {
    display: block;
  }
  .comparison-table tbody tr {
    display: block;
    margin-bottom: 1.25rem;
    background: white;
    border-radius: 0.625rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    border: 1px solid #e9ecef;
    padding: 1rem;
  }
  .comparison-table tbody tr:hover {
    background: white;
  }
  .comparison-table tbody tr td {
    display: block;
    border: none;
    padding: 0.75rem 0;
    width: 100% !important;
  }
  .comparison-table tbody tr td.criteria-label {
    font-size: 1.125rem;
    font-weight: 700;
    color: #4CAF50;
    background: transparent;
    border-bottom: 2px solid #e9ecef;
    padding-bottom: 1rem;
    margin-bottom: 1rem;
  }
  .comparison-table tbody tr td.score-cell {
    padding: 0.75rem 0;
    text-align: left;
    border-bottom: 1px solid #e9ecef;
  }
  .comparison-table tbody tr td.score-cell:last-child {
    border-bottom: none;
  }
  .comparison-table tbody tr td.score-cell::before {
    content: attr(data-framework);
    display: block;
    font-weight: 600;
    color: #000000;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
  }
}

.button-group {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
  justify-content: center;
}
@media (max-width: 576px) {
  .button-group {
    gap: 0.5rem;
  }
}
.button-group .btn {
  padding: 0.75rem 1.25rem;
  font-size: 0.875rem;
  border-radius: 0.5rem;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}
@media (max-width: 576px) {
  .button-group .btn {
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
    flex: 1;
    min-width: 0;
  }
}
.button-group .btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s ease-in-out;
}
.button-group .btn:hover:not(.active) {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(76, 175, 80, 0.2);
}
.button-group .btn:hover:not(.active)::before {
  left: 100%;
}
.button-group .btn.active {
  background: #4CAF50;
  color: white;
  box-shadow: 0 4px 12px rgba(76, 175, 80, 0.3);
  transform: translateY(-1px);
}
.button-group .btn.active:hover {
  background: rgb(68.2788844622, 157.2211155378, 71.8725099602);
}

.table-container {
  width: 100%;
  overflow-x: auto;
  border-radius: 0.625rem;
  margin-top: 1.25rem;
}
.table-container::-webkit-scrollbar {
  height: 8px;
}
.table-container::-webkit-scrollbar-track {
  background: #e9ecef;
  border-radius: 0.25rem;
}
.table-container::-webkit-scrollbar-thumb {
  background: #ced4da;
  border-radius: 0.25rem;
}
.table-container::-webkit-scrollbar-thumb:hover {
  background: #000000;
}
@media (max-width: 576px) {
  .table-container {
    overflow-x: visible;
    border-radius: 0;
  }
}

.demo-main-heading {
  color: #2c3e50;
  font-size: 2.5rem;
  font-family: Arial, sans-serif;
  margin-bottom: 1rem;
}

.demo-content-text {
  color: #34495e;
  font-size: 1rem;
  font-family: Arial, sans-serif;
  line-height: 1.6;
  margin-bottom: 1rem;
}

.demo-notice-box {
  background-color: #ecf0f1;
  padding: 15px;
  border-radius: 5px;
  margin-top: 20px;
}

.demo-notice-text {
  color: #e74c3c;
  font-size: 1.2rem;
  font-family: Arial, sans-serif;
  font-weight: bold;
  margin: 0;
}

.maintainability-example {
  margin-top: 2rem;
}

.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin: 2rem 0;
}
@media (max-width: 768px) {
  .comparison-grid {
    grid-template-columns: 1fr;
  }
}

.comparison-item {
  background: #f8f9fa;
  border: 1px solid #dee2e6;
  border-radius: 8px;
  padding: 1.5rem;
}
.comparison-item h5 {
  color: #495057;
  margin-bottom: 1rem;
  font-size: 1.1rem;
}
.comparison-item .task-list p {
  font-weight: bold;
  margin-bottom: 0.5rem;
}
.comparison-item .task-list ul {
  margin: 0;
  padding-left: 1.5rem;
}
.comparison-item .task-list ul li {
  margin-bottom: 0.5rem;
  color: #6c757d;
}

.interactive-color-demo {
  background: #ffffff;
  border: 2px solid #e9ecef;
  border-radius: 8px;
  padding: 2rem;
  margin-top: 2rem;
}
.interactive-color-demo h5 {
  margin-bottom: 1rem;
  color: #343a40;
}
.interactive-color-demo p {
  margin-bottom: 1.5rem;
  color: #6c757d;
}

.color-control {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}
.color-control label {
  font-weight: bold;
  color: #495057;
}
.color-control input[type=color] {
  width: 50px;
  height: 40px;
  border: 2px solid #dee2e6;
  border-radius: 4px;
  cursor: pointer;
}

.color-demo-content {
  border: 2px solid #dee2e6;
  border-radius: 8px;
  padding: 2rem;
  background: #ffffff;
}
.color-demo-content h3 {
  margin: 0 0 1rem 0;
  padding: 1rem;
  background: var(--demo-primary-color, #3498db);
  color: white;
  border-radius: 4px;
  text-align: center;
}
.color-demo-content p {
  color: #6c757d;
  margin-bottom: 1.5rem;
}
.color-demo-content .btn-primary {
  background: var(--demo-primary-color, #3498db);
  border-color: var(--demo-primary-color, #3498db);
  margin-right: 1rem;
  margin-bottom: 1rem;
}
.color-demo-content .demo-card {
  border: 1px solid #dee2e6;
  border-left: 4px solid var(--demo-primary-color, #3498db);
  border-radius: 4px;
  padding: 1.5rem;
  background: #f8f9fa;
}
.color-demo-content .demo-card h4 {
  margin: 0 0 0.5rem 0;
  color: var(--demo-primary-color, #3498db);
}
.color-demo-content .demo-card p {
  margin: 0;
  color: #6c757d;
}

.sample-website {
  border: 2px solid #ddd;
  border-radius: 8px;
  overflow: hidden;
  font-family: Arial, sans-serif;
  transition: all 0.3s ease;
  margin: 20px 0;
}
.sample-website .site-header {
  padding: 20px;
  text-align: center;
}
.sample-website .site-title {
  margin: 0;
  font-size: 1.8rem;
  font-weight: bold;
}
.sample-website .site-nav {
  display: flex;
  justify-content: center;
  gap: 20px;
  padding: 15px;
  border-bottom: 1px solid;
}
.sample-website .site-nav .nav-link {
  text-decoration: none;
  padding: 8px 16px;
  border-radius: 4px;
  transition: all 0.2s ease;
}
.sample-website .site-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 20px;
  padding: 20px;
}
.sample-website .site-content .main-article {
  padding: 0 15px 0 0;
}
.sample-website .site-content .main-article .article-title {
  margin: 0 0 15px 0;
  font-size: 1.4rem;
}
.sample-website .site-content .main-article .article-text {
  margin-bottom: 15px;
  line-height: 1.6;
}
.sample-website .site-content .site-sidebar {
  padding: 15px;
  border-radius: 6px;
}
.sample-website .site-content .site-sidebar .sidebar-title {
  margin: 0 0 10px 0;
  font-size: 1.2rem;
}
.sample-website .site-content .site-sidebar .sidebar-text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.5;
}
.sample-website.default-theme {
  background: #f8f9fa;
}
.sample-website.default-theme .site-header {
  color: #343a40;
}
.sample-website.default-theme .site-nav {
  background: #e9ecef;
  border-bottom-color: #dee2e6;
}
.sample-website.default-theme .site-nav .nav-link {
  color: #495057;
}
.sample-website.default-theme .site-nav .nav-link:hover {
  background: #007bff;
  color: white;
}
.sample-website.default-theme .site-content .main-article .article-title {
  color: #343a40;
}
.sample-website.default-theme .site-content .main-article .article-text {
  color: #6c757d;
}
.sample-website.default-theme .site-content .site-sidebar {
  background: #e9ecef;
  border: 1px solid #dee2e6;
}
.sample-website.default-theme .site-content .site-sidebar .sidebar-title {
  color: #495057;
}
.sample-website.default-theme .site-content .site-sidebar .sidebar-text {
  color: #6c757d;
}
.sample-website.dark-theme {
  background: #1a1a1a;
  border-color: #444;
}
.sample-website.dark-theme .site-header {
  color: white;
}
.sample-website.dark-theme .site-title {
  color: white;
}
.sample-website.dark-theme .site-nav {
  background: #2c3e50;
  border-bottom-color: #34495e;
}
.sample-website.dark-theme .site-nav .nav-link {
  color: #bdc3c7;
}
.sample-website.dark-theme .site-nav .nav-link:hover {
  background: #e74c3c;
  color: white;
}
.sample-website.dark-theme .site-content .main-article .article-title {
  color: #ecf0f1;
}
.sample-website.dark-theme .site-content .main-article .article-text {
  color: #bdc3c7;
}
.sample-website.dark-theme .site-content .site-sidebar {
  background: #34495e;
  border: 1px solid #4a5d6b;
}
.sample-website.dark-theme .site-content .site-sidebar .sidebar-title {
  color: #ecf0f1;
}
.sample-website.dark-theme .site-content .site-sidebar .sidebar-text {
  color: #bdc3c7;
}
.sample-website.colorful-theme {
  background: #fff3cd;
  border-color: #ffeaa7;
}
.sample-website.colorful-theme .site-header {
  background: linear-gradient(135deg, #fd79a8 0%, #fdcb6e 100%);
  color: white;
}
.sample-website.colorful-theme .site-nav {
  background: #ffeaa7;
  border-bottom-color: #fdcb6e;
}
.sample-website.colorful-theme .site-nav .nav-link {
  color: #d63031;
}
.sample-website.colorful-theme .site-nav .nav-link:hover {
  background: #00b894;
  color: white;
}
.sample-website.colorful-theme .site-content .main-article .article-title {
  color: #d63031;
}
.sample-website.colorful-theme .site-content .main-article .article-text {
  color: #2d3436;
}
.sample-website.colorful-theme .site-content .site-sidebar {
  background: #fd79a8;
  border: 1px solid #e84393;
  color: white;
}
.sample-website.colorful-theme .site-content .site-sidebar .sidebar-title {
  color: white;
}
.sample-website.colorful-theme .site-content .site-sidebar .sidebar-text {
  color: #f8f8f8;
}
.sample-website.minimal-theme {
  background: white;
  border: 1px solid #ddd;
}
.sample-website.minimal-theme .site-header {
  background: white;
  color: #333;
  border-bottom: 2px solid #333;
}
.sample-website.minimal-theme .site-nav {
  background: white;
  border-bottom-color: #eee;
}
.sample-website.minimal-theme .site-nav .nav-link {
  color: #333;
  border: 1px solid transparent;
}
.sample-website.minimal-theme .site-nav .nav-link:hover {
  border-color: #333;
  background: transparent;
  color: #333;
}
.sample-website.minimal-theme .site-content .main-article .article-title {
  color: #000;
  font-weight: normal;
}
.sample-website.minimal-theme .site-content .main-article .article-text {
  color: #444;
  font-size: 0.95rem;
}
.sample-website.minimal-theme .site-content .site-sidebar {
  background: #f9f9f9;
  border: 1px solid #eee;
}
.sample-website.minimal-theme .site-content .site-sidebar .sidebar-title {
  color: #000;
  font-weight: normal;
}
.sample-website.minimal-theme .site-content .site-sidebar .sidebar-text {
  color: #666;
  font-size: 0.85rem;
}
@media (max-width: 768px) {
  .sample-website .site-content {
    grid-template-columns: 1fr;
  }
  .sample-website .site-content .main-article {
    padding: 0;
  }
  .sample-website .site-nav {
    flex-wrap: wrap;
    gap: 10px;
  }
}

/*# sourceMappingURL=main.css.map */