/*  HERO BANNER  */
.hero-banner {
  background: linear-gradient(
    135deg,
    var(--accent-dark) 0%,
    var(--primary-color) 60%,
    #2a6fa8 100%
  );
  padding: 56px 0 48px;
  position: relative;
  overflow: hidden;
}
.hero-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.hero-banner .badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(201, 162, 77, 0.2);
  border: 1px solid rgba(201, 162, 77, 0.4);
  color: #fbd38d;
  font-size: 12px;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 20px;
  letter-spacing: 0.5px;
  margin-bottom: 18px;
}
.hero-banner h1 {
  font-size: clamp(26px, 4vw, 42px);
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 16px;
}
.hero-banner h1 span {
  color: #fbd38d;
}
.hero-banner p {
  font-size: var(--paragraph-large-size);
  font-weight: var(--paragraph-large-weight);
  color: rgba(255, 255, 255, 0.82);
  max-width: 640px;
  line-height: 1.7;
  margin-bottom: 28px;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 28px;
}
.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: var(--paragraph-small-size);
  color: rgba(255, 255, 255, 0.75);
}
.hero-meta-item i {
  color: var(--secondary-color);
  font-size: 13px;
}
.hero-code-preview {
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 12px;
  overflow: hidden;
  backdrop-filter: blur(4px);
}
.code-header {
  background: rgba(0, 0, 0, 0.25);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.code-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.code-dot.red {
  background: #ff5f57;
}
.code-dot.yellow {
  background: #febc2e;
}
.code-dot.green {
  background: #28c840;
}
.code-filename {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.5);
  margin-left: 8px;
  font-family: monospace;
}
.code-body {
  padding: 20px;
  font-family: "Courier New", monospace;
  font-size: 13px;
  line-height: 1.7;
}
.py-keyword {
  color: #79b8ff;
}
.py-builtin {
  color: #d2a679;
}
.py-string {
  color: #9ecbff;
}
.py-comment {
  color: #6a9955;
  font-style: italic;
}
.py-fn {
  color: #b392f0;
}
.py-num {
  color: #f8c555;
}
.py-plain {
  color: #e1e4e8;
}
.py-class {
  color: #ffd700;
}
/*  MAIN LAYOUT  */
.main-wrapper {
  padding: 32px 0 60px;
}
.order-lg-2 > .toc-card {
  display: none;
}
/*  SIDEBAR  */
.sidebar-sticky {
  position: sticky;
  top: 22%;
  max-height: calc(100vh - 40px);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-color) transparent;
}
.toc-card {
  background: var(--background-white);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
}
.toc-card-header {
  background: linear-gradient(135deg, var(--accent-dark), var(--primary-color));
  padding: 16px 20px;
  color: #fff;
  font-size: var(--paragraph-small-size);
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}
.toc-list {
  list-style: none;
  padding: 8px 0;
  margin: 0;
}
.toc-list li a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 20px;
  font-size: var(--paragraph-small-size);
  font-weight: 400;
  color: var(--text-dark);
  text-decoration: none;
  transition: all 0.15s;
  border-left: 3px solid transparent;
}
.toc-list li a:hover,
.toc-list li a.active {
  background: var(--hover-bg);
  border-left-color: var(--primary-color);
  color: var(--primary-color);
}
.toc-list li a i {
  font-size: 12px;
  color: var(--secondary-color);
  width: 14px;
}
.promo-card {
  background: linear-gradient(135deg, #f0faf9, #d6efed);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
  margin-top: 24px;
  text-align: center;
}
.promo-card .promo-icon {
  font-size: 32px;
  margin-bottom: 10px;
  color: var(--primary-color);
}
.promo-card h5 {
  font-size: var(--paragraph-medium-size);
  font-weight: 700;
  color: var(--accent-dark);
  margin-bottom: 6px;
}
.promo-card p {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 14px;
}
.btn-promo {
  display: block;
  background: var(--primary-color);
  color: #fff;
  padding: 10px;
  border-radius: 8px;
  font-size: var(--paragraph-small-size);
  font-weight: 600;
  text-decoration: none;
}
.btn-promo:hover {
  background: var(--accent-dark);
  color: #fff;
}
/*  STATS STRIP  */
.stats-strip {
  background: linear-gradient(135deg, var(--accent-dark), var(--primary-color));
  border-radius: 12px;
  padding: 24px 28px;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 20px;
}
.stat-item {
  text-align: center;
}
.stat-item .stat-number {
  font-size: 28px;
  font-weight: 800;
  color: #fff;
  display: block;
}
.stat-item .stat-label {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.65);
  font-weight: 500;
}
.stat-divider {
  width: 1px;
  height: 40px;
  background: rgba(255, 255, 255, 0.15);
}
/*  INTRO CARD  */
.intro-card {
  background: var(--background-white);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 28px 32px;
  margin-bottom: 24px;
}
.last-updated {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.last-updated i {
  color: var(--secondary-color);
}
.intro-card h2 {
  font-size: var(--heading-2-size);
  font-weight: var(--heading-2-weight);
  color: var(--text-dark);
  margin-bottom: 16px;
  line-height: 1.25;
}
.intro-card p {
  font-size: var(--paragraph-large-size);
  font-weight: var(--paragraph-large-weight);
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 16px;
}
.intro-points {
  list-style: none;
  margin: 18px 0 24px;
  padding: 0;
}
.intro-points li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: var(--paragraph-normal-size);
  font-weight: var(--paragraph-normal-weight);
  color: var(--text-dark);
  margin-bottom: 10px;
  line-height: 1.7;
}
.intro-points li i {
  color: var(--primary-color);
  margin-top: 4px;
  font-size: 12px;
  flex-shrink: 0;
}
.intro-points li strong {
  font-weight: 700;
  color: var(--accent-dark);
}
.intro-points li span {
  flex: 1;
}
.highlight-box {
  background: var(--hover-bg);
  border-left: 4px solid var(--primary-color);
  border-radius: 0 8px 8px 0;
  padding: 14px 18px;
  margin: 16px 0;
  font-size: var(--paragraph-normal-size);
  color: var(--text-dark);
  line-height: 1.6;
}
.highlight-box strong {
  color: var(--primary-color);
}
/*  FEATURES GRID  */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 14px;
  margin: 20px 0;
}
.feature-card {
  background: var(--background-light);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 16px;
  transition: 0.2s;
}
.feature-card:hover {
  border-color: var(--primary-color);
  background: var(--hover-bg);
  transform: translateY(-2px);
}
.feature-card i {
  font-size: 22px;
  color: var(--primary-color);
  margin-bottom: 10px;
  display: block;
}
.feature-card h5 {
  font-size: var(--paragraph-small-size);
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 5px;
}
.feature-card p {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.5;
}
/*  PREREQ CARD  */
.prereq-card {
  background: #f0faf9;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px 24px;
  margin-bottom: 24px;
  display: flex;
  align-items: flex-start;
  gap: 14px;
}
.prereq-icon {
  font-size: 24px;
  color: var(--secondary-color);
  margin-top: 2px;
  flex-shrink: 0;
}
.prereq-content h5 {
  font-size: var(--paragraph-large-size);
  font-weight: 700;
  color: var(--accent-dark);
  margin-bottom: 8px;
}
.prereq-content p {
  font-size: var(--paragraph-normal-size);
  color: var(--text-muted);
  margin-bottom: 10px;
}
.prereq-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.prereq-tag {
  background: var(--background-white);
  border: 1px solid var(--border-secondary-color);
  color: var(--accent-dark);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 16px;
  text-decoration: none;
}
.prereq-tag:hover {
  background: var(--primary-color);
  color: #fff;
  border-color: var(--primary-color);
}
/*  QUICK START  */
.quick-start-card {
  background: var(--background-white);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 28px 32px;
  margin-bottom: 24px;
}
.section-title {
  font-size: var(--heading-3-size);
  font-weight: var(--heading-3-weight);
  color: var(--text-dark);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.section-title::after {
  content: "";
  flex: 1;
  height: 2px;
  background: linear-gradient(to right, var(--border-color), transparent);
  margin-left: 8px;
}
.section-subtitle {
  font-size: var(--paragraph-normal-size);
  color: var(--text-muted);
  margin-bottom: 20px;
}
.apps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 12px;
  margin: 16px 0;
}
.app-card {
  background: var(--background-light);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 16px 12px;
  text-align: center;
  transition: 0.2s;
}
.app-card:hover {
  border-color: var(--primary-color);
  background: var(--hover-bg);
}
.app-card i {
  font-size: 24px;
  color: var(--primary-color);
  margin-bottom: 8px;
  display: block;
}
.app-card span {
  font-size: var(--paragraph-small-size);
  font-weight: 600;
  color: var(--text-dark);
}
/*  COMPARISON TABLE  */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
}
.comparison-table th {
  background: var(--accent-dark);
  color: #fff;
  padding: 12px 16px;
  font-size: var(--paragraph-small-size);
  font-weight: 700;
  text-align: left;
}
.comparison-table th:first-child {
  border-radius: 8px 0 0 0;
}
.comparison-table th:last-child {
  border-radius: 0 8px 0 0;
}
.comparison-table td {
  padding: 10px 16px;
  font-size: var(--paragraph-small-size);
  color: var(--text-dark);
  border-bottom: 1px solid var(--border-color);
}
.comparison-table tr:nth-child(even) td {
  background: var(--background-light);
}
.comparison-table tr:hover td {
  background: var(--hover-bg);
}
.badge-yes {
  color: #16a34a;
  font-weight: 700;
}
.badge-no {
  color: #dc2626;
  font-weight: 700;
}
/*  TOPIC SECTIONS  */
.topic-section {
  background: var(--background-white);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  margin-bottom: 24px;
  overflow: hidden;
}
.topic-section-header {
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: flex-start;
  gap: 14px;
}
.topic-icon-wrap {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent-dark), var(--primary-color));
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.topic-icon-wrap i {
  color: #fff;
  font-size: 18px;
}
.topic-icon-wrap.secondary {
  background: linear-gradient(135deg, #744210, #d97706);
}
.topic-icon-wrap.soft {
  background: linear-gradient(135deg, #1a7a60, #27a085);
}
.topic-icon-wrap.purple {
  background: linear-gradient(135deg, #4a3080, #7b52c8);
}
.topic-icon-wrap.red {
  background: linear-gradient(135deg, #8b2020, #c84040);
}
.topic-icon-wrap.blue {
  background: linear-gradient(135deg, #1a4a8b, #2d72d9);
}
.topic-icon-wrap.orange {
  background: linear-gradient(135deg, #8b4500, #d97706);
}
.topic-icon-wrap.teal {
  background: linear-gradient(135deg, #0f5e5e, #0d9488);
}
.topic-icon-wrap.green {
  background: linear-gradient(135deg, #14532d, #16a34a);
}
.topic-icon-wrap.indigo {
  background: linear-gradient(135deg, #312e81, #4f46e5);
}
.topic-icon-wrap.pink {
  background: linear-gradient(135deg, #831843, #db2777);
}
.topic-icon-wrap.cyan {
  background: linear-gradient(135deg, #164e63, #0891b2);
}
.topic-icon-wrap.amber {
  background: linear-gradient(135deg, #78350f, #d97706);
}
.topic-icon-wrap.lime {
  background: linear-gradient(135deg, #365314, #65a30d);
}
.topic-icon-wrap.rose {
  background: linear-gradient(135deg, #881337, #e11d48);
}
.topic-icon-wrap.sky {
  background: linear-gradient(135deg, #0c4a6e, #0284c7);
}
.topic-title-wrap h3 {
  font-size: var(--heading-4-size);
  font-weight: var(--heading-4-weight);
  color: var(--text-dark);
  margin-bottom: 4px;
}
.topic-title-wrap p {
  font-size: var(--paragraph-small-size);
  color: var(--text-muted);
  line-height: 1.5;
}
.topic-links-grid {
  padding: 16px 24px 20px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 6px;
}
.topic-link {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 12px;
  border-radius: 8px;
  text-decoration: none;
  color: var(--text-dark);
  font-size: var(--paragraph-small-size);
  font-weight: 400;
  transition: all 0.15s;
  border: 1px solid transparent;
}
.topic-link:hover {
  background: var(--hover-bg);
  border-color: var(--border-color);
  color: var(--primary-color);
}
.topic-link i {
  font-size: 11px;
  color: var(--primary-color);
}
/*  CODE BLOCK  */
.code-block {
  background: #0d1117;
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: 24px;
}
.code-block-header {
  background: #161b22;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #30363d;
}
.code-lang-badge {
  font-size: 11px;
  font-weight: 700;
  color: var(--secondary-color);
  background: rgba(201, 162, 77, 0.15);
  padding: 2px 8px;
  border-radius: 4px;
  letter-spacing: 0.5px;
}
.code-copy-btn {
  background: none;
  border: 1px solid #30363d;
  color: #8b949e;
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 5px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 5px;
  transition: 0.15s;
}
.code-copy-btn:hover {
  border-color: #8b949e;
  color: #e6edf3;
}
.code-block pre {
  padding: 20px;
  margin: 0;
  overflow-x: auto;
  font-family: "Courier New", monospace;
  font-size: 13px;
  line-height: 1.75;
  color: #e1e4e8;
}
/*  FEEDBACK ROW  */
.feedback-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  background: var(--background-light);
  border-top: 1px solid var(--border-color);
  font-size: var(--paragraph-small-size);
  color: var(--text-muted);
  flex-wrap: wrap;
}
.feedback-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: 20px;
  border: 1px solid var(--border-color);
  background: var(--background-white);
  font-size: var(--paragraph-small-size);
  font-weight: 600;
  cursor: pointer;
  transition: 0.15s;
  color: var(--text-dark);
}
.feedback-btn:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}
.feedback-btn i {
  font-size: 12px;
}
/*  HERO ACTIONS  */
.btn-hero-primary {
  background: var(--secondary-color);
  color: #fff;
  border: none;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: var(--paragraph-normal-size);
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: 0.2s;
}
.btn-hero-primary:hover {
  background: #b8902e;
  color: #fff;
  transform: translateY(-1px);
}
.btn-hero-outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255, 255, 255, 0.4);
  padding: 11px 24px;
  border-radius: 8px;
  font-size: var(--paragraph-normal-size);
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: 0.2s;
}
.btn-hero-outline:hover {
  border-color: #fff;
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}
/*  RESPONSIVE  */
@media (max-width: 991.98px) {
  .sidebar-sticky {
    position: static;
    max-height: none;
  }

  .stat-divider {
    display: none;
  }

  .order-lg-2 > .toc-card {
    display: block;
  }

  .sidebar-sticky > .toc-card {
    display: none;
  }
}

@media (max-width: 767.98px) {
  .hero-banner {
    padding: 36px 0 32px;
  }

  .intro-card,
  .quick-start-card {
    padding: 20px;
  }

  .topic-links-grid {
    grid-template-columns: 1fr 1fr;
  }

  .stats-strip {
    padding: 18px 20px;
  }

  .stat-item .stat-number {
    font-size: 22px;
  }
}

@media (max-width: 575.98px) {
  .topic-links-grid {
    grid-template-columns: 1fr;
  }

  .features-grid {
    grid-template-columns: 1fr 1fr;
  }

  .apps-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .app-card {
    padding: 10px 0;
  }

  .app-card i {
    font-size: 15px;
  }

  .app-card span {
    font-size: 10px;
  }
}