:root {
  --bg-primary: #0a0e14;
  --bg-secondary: #111822;
  --bg-card: #121a24;
  --bg-code: #06090d;
  --text-main: #f0fdf4;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --accent-primary: #10b981;
  --accent-neon: #00ff88;
  --accent-mint: #34d399;
  --accent-cyan: #38bdf8;
  --accent-blue: #059669;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  --accent-purple: #a855f7;
  --border-color: #1e293b;
  --border-light: #334155;
  --border-glow: rgba(16, 185, 129, 0.35);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Menlo, Monaco, 'Courier New', monospace;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.3);
  --shadow-md: 0 4px 8px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.4);
  --shadow-lg: 0 10px 20px -3px rgb(0 0 0 / 0.5), 0 4px 6px -4px rgb(0 0 0 / 0.5);
}

/* Light Theme Mode */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-code: #0b1120;
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #64748b;
  --accent-primary: #059669;
  --accent-neon: #047857;
  --accent-mint: #059669;
  --accent-cyan: #0284c7;
  --accent-blue: #2563eb;
  --accent-emerald: #059669;
  --accent-amber: #d97706;
  --accent-rose: #e11d48;
  --accent-purple: #9333ea;
  --border-color: #e2e8f0;
  --border-light: #cbd5e1;
  --border-glow: rgba(5, 150, 105, 0.25);
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.08);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.25s ease, color 0.25s ease;
}

a {
  color: var(--accent-mint);
  text-decoration: none;
  transition: all 0.2s ease;
}

a:hover {
  color: var(--accent-neon);
  text-decoration: underline;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header & Navigation */
.site-header {
  background-color: rgba(10, 14, 20, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(16, 185, 129, 0.2);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 12px 0;
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

[data-theme="light"] .site-header {
  background-color: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid #e2e8f0;
  box-shadow: 0 1px 4px 0 rgba(0, 0, 0, 0.05);
}

.nav-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.nav-brand {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.nav-brand:hover {
  text-decoration: none;
  color: var(--accent-neon);
}

.nav-brand .badge-tag {
  background: linear-gradient(135deg, #059669, #10b981);
  color: #06090d;
  font-size: 0.72rem;
  padding: 3px 8px;
  border-radius: 9999px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 12px;
  list-style: none;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.nav-links a:hover, .nav-links a.active {
  color: var(--accent-neon);
  background-color: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.25);
  text-decoration: none;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-color);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
}

[data-theme="light"] .theme-toggle-btn {
  background-color: #f1f5f9;
  border-color: #cbd5e1;
  color: #0f172a;
}

.theme-toggle-btn:hover {
  background-color: rgba(16, 185, 129, 0.15);
  border-color: var(--accent-primary);
  color: var(--accent-neon);
  transform: translateY(-1px);
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-top: 24px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--text-muted);
}

.breadcrumb a:hover {
  color: var(--accent-mint);
}

.breadcrumb span.sep {
  color: var(--text-dim);
}

.breadcrumb span.current {
  color: var(--accent-neon);
  font-weight: 500;
}

/* Hero Section */
.hero {
  padding: 48px 0 32px;
  text-align: center;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 14px;
  color: var(--text-main);
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 750px;
  margin: 0 auto 28px;
}

/* Hero Statistics Metrics */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  max-width: 960px;
  margin: 24px auto 0;
  padding: 0 12px;
}

.stat-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.stat-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-primary);
  box-shadow: 0 6px 18px rgba(16, 185, 129, 0.15);
}

.stat-number {
  font-family: 'JetBrains Mono', 'Fira Code', 'Roboto Mono', monospace;
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--accent-neon);
  line-height: 1.2;
  margin-bottom: 4px;
}

[data-theme="light"] .stat-number {
  color: var(--accent-primary);
}

.stat-label {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stat-sub {
  font-size: 0.76rem;
  color: var(--text-dim);
  margin-top: 4px;
  font-family: 'JetBrains Mono', 'Fira Code', 'Roboto Mono', monospace;
}

/* Track Navigation Tabs */
.track-switcher {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.track-btn {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s ease;
}

.track-btn:hover {
  border-color: var(--accent-primary);
  color: var(--accent-neon);
}

.track-btn.active {
  background-color: rgba(16, 185, 129, 0.14);
  border-color: var(--accent-primary);
  color: var(--text-main);
  box-shadow: 0 0 16px rgba(16, 185, 129, 0.2);
}

.track-badge {
  background-color: rgba(255, 255, 255, 0.08);
  font-size: 0.78rem;
  padding: 2px 8px;
  border-radius: 9999px;
  color: var(--text-dim);
}

[data-theme="light"] .track-badge {
  background-color: #e2e8f0;
  color: #475569;
}

.track-btn.active .track-badge {
  background-color: var(--accent-primary);
  color: #ffffff;
  font-weight: 800;
}

/* Track Section Headers */
.track-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  background: linear-gradient(90deg, rgba(18, 26, 36, 0.95), rgba(10, 14, 20, 0.85));
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-left: 4px solid var(--accent-primary);
  border-radius: var(--radius-lg);
  margin-top: 36px;
  margin-bottom: 20px;
}

[data-theme="light"] .track-header {
  background: linear-gradient(90deg, #ffffff, #f8fafc);
  border: 1px solid #e2e8f0;
  border-left: 4px solid var(--accent-primary);
  box-shadow: var(--shadow-sm);
}

.track-header.advanced-header {
  border-left-color: var(--accent-mint);
}

.track-title-wrap {
  display: flex;
  align-items: center;
  gap: 16px;
}

.track-icon {
  font-size: 2rem;
  line-height: 1;
}

.track-header h2 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 0 0 4px;
}

.track-header p {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin: 0;
}

.track-count-badge {
  background-color: var(--bg-primary);
  border: 1px solid rgba(16, 185, 129, 0.3);
  padding: 6px 14px;
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-mint);
  white-space: nowrap;
}

[data-theme="light"] .track-count-badge {
  background-color: #f1f5f9;
  border-color: #cbd5e1;
  color: var(--accent-primary);
}

.results-counter {
  font-size: 0.9rem;
  color: var(--text-dim);
  margin-bottom: 18px;
  font-weight: 500;
}

.results-counter strong {
  color: var(--accent-neon);
}

/* Search & Filters */
.filter-panel {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 36px;
  box-shadow: var(--shadow-md);
}

.search-box {
  position: relative;
  margin-bottom: 16px;
}

.search-input {
  width: 100%;
  padding: 12px 18px 12px 42px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-size: 0.95rem;
  font-family: inherit;
  outline: none;
  transition: all 0.2s ease;
}

.search-input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 12px rgba(16, 185, 129, 0.25);
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-dim);
  font-size: 1.1rem;
}

.filter-chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}

.filter-label {
  font-size: 0.85rem;
  color: var(--text-dim);
  font-weight: 600;
  margin-right: 4px;
}

.chip {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 6px 14px;
  border-radius: 9999px;
  font-size: 0.84rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.chip:hover {
  border-color: var(--accent-primary);
  color: var(--accent-neon);
}

.chip.active {
  background-color: var(--accent-primary);
  border-color: var(--accent-primary);
  color: #ffffff;
  font-weight: 700;
  box-shadow: 0 0 12px rgba(16, 185, 129, 0.3);
}

/* Project Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
  align-items: stretch;
}

.project-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
  min-height: 250px;
  box-sizing: border-box;
  overflow: hidden;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  color: inherit;
}

.project-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-primary);
  box-shadow: 0 8px 24px -4px rgba(16, 185, 129, 0.25);
  text-decoration: none;
}

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 12px;
  gap: 8px;
}

.card-pills {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.project-num-badge {
  font-size: 0.73rem;
  font-weight: 700;
  font-family: 'JetBrains Mono', 'Fira Code', 'Roboto Mono', monospace;
  padding: 3px 7px;
  border-radius: var(--radius-sm);
  background: rgba(16, 185, 129, 0.12);
  color: var(--accent-neon);
  border: 1px solid rgba(16, 185, 129, 0.35);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

[data-theme="light"] .project-num-badge {
  background: #f1f5f9;
  color: #0f766e;
  border-color: #cbd5e1;
}

.card-num-prefix {
  color: var(--accent-mint);
  font-family: 'JetBrains Mono', 'Fira Code', 'Roboto Mono', monospace;
  font-weight: 800;
  font-size: 0.95em;
  margin-right: 6px;
  display: inline-block;
}

[data-theme="light"] .card-num-prefix {
  color: #0f766e;
}

.project-num-pill {
  font-size: 0.75rem;
  font-weight: 700;
  font-family: 'JetBrains Mono', 'Fira Code', 'Roboto Mono', monospace;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-neon);
  border: 1px solid var(--accent-primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

[data-theme="light"] .project-num-pill {
  background: #e6fffa;
  color: #0d9488;
  border-color: #14b8a6;
}

.title-num {
  color: var(--accent-mint);
  font-family: 'JetBrains Mono', 'Fira Code', 'Roboto Mono', monospace;
  font-weight: 800;
  margin-right: 10px;
}

[data-theme="light"] .title-num {
  color: #0f766e;
}

.section-pill {
  font-size: 0.73rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

/* 12 Distinct Section Pill Styles */
.section-1 { background-color: rgba(56, 189, 248, 0.15); color: #0284c7; border: 1px solid rgba(56, 189, 248, 0.35); }
.section-2 { background-color: rgba(129, 140, 248, 0.15); color: #6366f1; border: 1px solid rgba(129, 140, 248, 0.35); }
.section-3 { background-color: rgba(167, 139, 250, 0.15); color: #8b5cf6; border: 1px solid rgba(167, 139, 250, 0.35); }
.section-4 { background-color: rgba(236, 72, 153, 0.15); color: #db2777; border: 1px solid rgba(236, 72, 153, 0.35); }
.section-5 { background-color: rgba(244, 63, 94, 0.15); color: #e11d48; border: 1px solid rgba(244, 63, 94, 0.35); }
.section-6 { background-color: rgba(251, 146, 60, 0.15); color: #ea580c; border: 1px solid rgba(251, 146, 60, 0.35); }
.section-7 { background-color: rgba(239, 68, 68, 0.15); color: #dc2626; border: 1px solid rgba(239, 68, 68, 0.35); }
.section-8 { background-color: rgba(245, 158, 11, 0.15); color: #d97706; border: 1px solid rgba(245, 158, 11, 0.35); }
.section-9 { background-color: rgba(16, 185, 129, 0.15); color: #059669; border: 1px solid rgba(16, 185, 129, 0.35); }
.section-10 { background-color: rgba(6, 182, 212, 0.15); color: #0891b2; border: 1px solid rgba(6, 182, 212, 0.35); }
.section-11 { background-color: rgba(139, 92, 246, 0.15); color: #7c3aed; border: 1px solid rgba(139, 92, 246, 0.35); }
.section-12 { background-color: rgba(34, 197, 94, 0.15); color: #16a34a; border: 1px solid rgba(34, 197, 94, 0.35); }

.embedded-badge {
  font-size: 0.73rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.emb-high { background-color: rgba(244, 63, 94, 0.15); color: #e11d48; border: 1px solid rgba(244, 63, 94, 0.35); }
.emb-med { background-color: rgba(245, 158, 11, 0.15); color: #d97706; border: 1px solid rgba(245, 158, 11, 0.35); }
.emb-core { background-color: rgba(16, 185, 129, 0.15); color: #059669; border: 1px solid rgba(16, 185, 129, 0.35); }

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
  line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 2.7rem;
}

.card-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 14px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 3.95rem;
  flex-grow: 1;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px solid rgba(128, 128, 128, 0.15);
  min-height: 34px;
  max-height: 34px;
  overflow: hidden;
}

.tag {
  background-color: var(--bg-primary);
  color: var(--text-dim);
  font-size: 0.73rem;
  font-family: var(--font-mono);
  padding: 2px 8px;
  border-radius: 4px;
  white-space: nowrap;
}

[data-theme="light"] .tag {
  background-color: #f1f5f9;
  color: #475569;
}

/* Detail Page Layout */
.project-header {
  padding: 20px 0 28px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 32px;
}

.project-title {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.project-meta {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.project-summary-box {
  background-color: var(--bg-secondary);
  border-left: 4px solid var(--accent-primary);
  padding: 16px 20px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: 1rem;
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
}

/* Sections in Detail Page */
.study-section {
  margin-bottom: 48px;
}

.section-heading {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
}

.section-heading .icon {
  font-size: 1.35rem;
}

/* Code Viewer & Tabs */
.code-viewer {
  background-color: var(--bg-code);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  margin-bottom: 24px;
}

.code-header {
  background-color: #0d131a;
  border-bottom: 1px solid #1e293b;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 16px;
  flex-wrap: wrap;
}

.code-tabs {
  display: flex;
  gap: 2px;
  overflow-x: auto;
}

.code-tab {
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: #94a3b8;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 12px 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.code-tab:hover {
  color: #f0fdf4;
}

.code-tab.active {
  color: #00ff88;
  border-bottom-color: #10b981;
  background-color: rgba(16, 185, 129, 0.12);
}

.code-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 0;
}

.btn-copy {
  background-color: #111822;
  border: 1px solid #1e293b;
  color: #94a3b8;
  font-size: 0.8rem;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.btn-copy:hover {
  color: #fff;
  border-color: #10b981;
}

.btn-copy.copied {
  background-color: rgba(16, 185, 129, 0.2);
  border-color: #10b981;
  color: #00ff88;
}

.code-panel {
  display: none;
  padding: 20px;
  overflow-x: auto;
}

.code-panel.active {
  display: block;
}

pre.code-block {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.65;
  color: #e6edf3;
  tab-size: 4;
}

.content-card pre.code-block {
  background-color: var(--bg-code);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  margin: 16px 0;
  overflow-x: auto;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.35);
}

[data-theme="light"] .content-card pre.code-block {
  background-color: #0b1120;
  border-color: #cbd5e1;
  color: #e2e8f0;
}

/* Standalone Code Snippet Box (for Refactoring & Deep-Dives) */
.code-snippet-box {
  background-color: var(--bg-code);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin: 18px 0;
  overflow: hidden;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.35);
}

[data-theme="light"] .code-snippet-box {
  background-color: #0b1120;
  border-color: #cbd5e1;
}

.code-snippet-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 14px;
  background-color: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}

[data-theme="light"] .code-snippet-header {
  background-color: rgba(0, 0, 0, 0.2);
  border-bottom-color: rgba(255, 255, 255, 0.1);
}

.code-snippet-title {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--accent-mint);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

[data-theme="light"] .code-snippet-title {
  color: #38bdf8;
}

.btn-copy-snippet {
  background-color: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #94a3b8;
  font-size: 0.75rem;
  font-family: inherit;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: all 0.2s ease;
}

.btn-copy-snippet:hover {
  color: #fff;
  border-color: var(--accent-primary);
  background-color: rgba(16, 185, 129, 0.15);
}

.btn-copy-snippet.copied {
  background-color: rgba(16, 185, 129, 0.25);
  border-color: var(--accent-primary);
  color: var(--accent-neon);
}

.code-snippet-box pre.code-block {
  padding: 16px 18px;
  margin: 0;
  border: none;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

/* Syntax Highlighting Colors (High-Contrast C++ Tokenizer) */
.tok-kw { color: #ff7b72; font-weight: 600; } /* Keywords: class, virtual, return, if, constexpr */
.tok-type { color: #79c0ff; font-weight: 500; } /* Types: int, uint8_t, string, vector, unique_ptr */
.tok-fn { color: #d2a8ff; font-weight: 600; } /* Function names / method invocations */
.tok-str { color: #a5d6ff; } /* String literals */
.tok-num { color: #79c0ff; } /* Numbers (hex, binary, int) */
.tok-com { color: #8b949e; font-style: italic; } /* Regular comments */
.tok-emb-com { color: #00ff88; font-weight: 600; } /* Embedded/Hardware comments */
.tok-pre { color: #ffa657; font-weight: 600; } /* Preprocessor #include, #define */

/* Content Cards & Explanations */
.content-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.content-card h3 {
  font-size: 1.25rem;
  color: var(--text-main);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.content-card p {
  color: var(--text-muted);
  margin-bottom: 16px;
}

[data-theme="light"] .content-card p {
  color: #334155;
}

.content-card ul, .content-card ol {
  margin-left: 24px;
  margin-bottom: 16px;
  color: var(--text-muted);
}

[data-theme="light"] .content-card ul, [data-theme="light"] .content-card ol {
  color: #334155;
}

.content-card li {
  margin-bottom: 8px;
}

/* Callouts / Alerts */
.callout {
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin: 20px 0;
  border-left: 4px solid;
}

.callout-embedded {
  background-color: rgba(168, 85, 247, 0.1);
  border-left-color: var(--accent-purple);
  color: var(--text-main);
}

.callout-embedded h4 {
  color: #d8b4fe;
  margin-bottom: 6px;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 6px;
}

[data-theme="light"] .callout-embedded h4 {
  color: #7e22ce;
}

.callout-warning {
  background-color: rgba(244, 63, 94, 0.1);
  border-left-color: var(--accent-rose);
  color: var(--text-main);
}

.callout-warning h4 {
  color: #fda4af;
  margin-bottom: 6px;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 6px;
}

[data-theme="light"] .callout-warning h4 {
  color: #be123c;
}

.callout-tip {
  background-color: rgba(16, 185, 129, 0.1);
  border-left-color: var(--accent-primary);
  color: var(--text-main);
}

.callout-tip h4 {
  color: var(--accent-mint);
  margin-bottom: 6px;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 6px;
}

[data-theme="light"] .callout-tip h4 {
  color: #047857;
}

/* Comparison Table */
.table-container {
  overflow-x: auto;
  margin: 20px 0;
}

table.comp-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

table.comp-table th {
  background-color: #16202c;
  color: #fff;
  text-align: left;
  padding: 12px 16px;
  border-bottom: 2px solid var(--border-light);
}

[data-theme="light"] table.comp-table th {
  background-color: #f1f5f9;
  color: #0f172a;
}

table.comp-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-muted);
}

[data-theme="light"] table.comp-table td {
  color: #334155;
}

table.comp-table tr:nth-child(even) {
  background-color: rgba(128, 128, 128, 0.04);
}

/* SVG Architecture & UML Diagram Containers */
.diagram-container {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin: 24px 0;
  text-align: center;
  overflow-x: auto;
  box-shadow: var(--shadow-sm);
}

.diagram-container h4 {
  font-size: 1rem;
  color: var(--text-main);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.svg-diagram {
  max-width: 100%;
  height: auto;
  display: inline-block;
  margin: 0 auto;
}

/* UML Card Diagram & Architectural Models */
.uml-diagram-wrapper {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 22px;
  margin: 16px 0 24px 0;
  box-shadow: var(--shadow-sm);
}

.uml-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.uml-header-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--accent-mint);
  display: flex;
  align-items: center;
  gap: 8px;
}

.uml-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.76rem;
  font-family: var(--font-mono);
}

.uml-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
}

.uml-legend-badge {
  font-weight: 700;
  border-radius: 3px;
  padding: 0 4px;
}

.uml-legend-badge.pub { color: #34d399; background: rgba(52, 211, 153, 0.15); }
.uml-legend-badge.priv { color: #f87171; background: rgba(248, 113, 113, 0.15); }
.uml-legend-badge.prot { color: #fbbf24; background: rgba(251, 191, 36, 0.15); }

.uml-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin: 16px 0;
}

.uml-class-card {
  background-color: var(--bg-secondary);
  border: 2px solid rgba(16, 185, 129, 0.4);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  font-family: var(--font-mono);
  font-size: 0.84rem;
  text-align: left;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
}

.uml-class-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-neon);
  box-shadow: 0 6px 16px -2px rgba(16, 185, 129, 0.25);
}

.uml-class-card.abstract-class {
  border-color: rgba(168, 85, 247, 0.5);
}
.uml-class-card.abstract-class:hover {
  border-color: var(--accent-purple);
  box-shadow: 0 6px 16px -2px rgba(168, 85, 247, 0.3);
}

.uml-class-card.struct-card {
  border-color: rgba(56, 189, 248, 0.4);
}
.uml-class-card.struct-card:hover {
  border-color: var(--accent-cyan);
}

.uml-class-card.module-card {
  border-color: rgba(245, 158, 11, 0.4);
}
.uml-class-card.module-card:hover {
  border-color: var(--accent-amber);
}

.uml-class-header {
  background-color: rgba(16, 185, 129, 0.12);
  border-bottom: 1px solid var(--border-color);
  padding: 10px 14px;
  text-align: center;
  position: relative;
}

.abstract-class .uml-class-header {
  background-color: rgba(168, 85, 247, 0.12);
}

.struct-card .uml-class-header {
  background-color: rgba(56, 189, 248, 0.12);
}

.module-card .uml-class-header {
  background-color: rgba(245, 158, 11, 0.12);
}

.uml-stereotype {
  font-size: 0.72rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: block;
  margin-bottom: 2px;
}

.uml-class-name {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--accent-neon);
  display: block;
}

.abstract-class .uml-class-name {
  font-style: italic;
  color: #c084fc;
}

[data-theme="light"] .uml-class-name {
  color: #059669;
}
[data-theme="light"] .abstract-class .uml-class-name {
  color: #7e22ce;
}

.uml-badge-tag {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
  margin-top: 4px;
  border: 1px solid var(--border-color);
}

.uml-section {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
  flex-grow: 1;
}

.uml-section:last-child {
  border-bottom: none;
}

.uml-section-label {
  font-size: 0.68rem;
  text-transform: uppercase;
  color: var(--text-dim);
  letter-spacing: 0.05em;
  margin-bottom: 6px;
  font-weight: 600;
}

.uml-item {
  margin-bottom: 4px;
  line-height: 1.45;
  word-break: break-word;
}

.uml-item:last-child {
  margin-bottom: 0;
}

.uml-item .vis {
  font-weight: 700;
  display: inline-block;
  width: 14px;
  text-align: center;
  margin-right: 4px;
}

.uml-item.private { color: #f87171; }
.uml-item.public { color: #34d399; }
.uml-item.protected { color: #fbbf24; }
.uml-item.internal { color: #38bdf8; }

.uml-item .field-name {
  font-weight: 600;
  color: var(--text-main);
}
.uml-item .field-type {
  color: #38bdf8;
}
.uml-item .method-spec {
  color: #a855f7;
  font-style: italic;
  font-size: 0.78rem;
  margin-left: 4px;
}

[data-theme="light"] .uml-item.private { color: #dc2626; }
[data-theme="light"] .uml-item.public { color: #059669; }
[data-theme="light"] .uml-item.protected { color: #d97706; }
[data-theme="light"] .uml-item .field-type { color: #0284c7; }
[data-theme="light"] .uml-item .method-spec { color: #7e22ce; }

.uml-relationships {
  margin-top: 16px;
  padding: 12px 16px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.uml-rel-title {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 8px;
  letter-spacing: 0.05em;
}

.uml-rel-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.uml-rel-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-main);
  flex-wrap: wrap;
}

.uml-rel-badge {
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 600;
  border: 1px solid var(--border-color);
}
.uml-rel-badge.inherits { background: rgba(168, 85, 247, 0.15); color: #c084fc; border-color: rgba(168, 85, 247, 0.3); }
.uml-rel-badge.composes { background: rgba(56, 189, 248, 0.15); color: #38bdf8; border-color: rgba(56, 189, 248, 0.3); }
.uml-rel-badge.aggregates { background: rgba(245, 158, 11, 0.15); color: #fbbf24; border-color: rgba(245, 158, 11, 0.3); }
.uml-rel-badge.uses { background: rgba(52, 211, 153, 0.15); color: #34d399; border-color: rgba(52, 211, 153, 0.3); }

[data-theme="light"] .uml-rel-badge.inherits { color: #7e22ce; }
[data-theme="light"] .uml-rel-badge.composes { color: #0284c7; }
[data-theme="light"] .uml-rel-badge.aggregates { color: #b45309; }
[data-theme="light"] .uml-rel-badge.uses { color: #059669; }

/* Interactive MCQ Quiz Styles */
.quiz-container {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-top: 32px;
  box-shadow: var(--shadow-md);
}

.quiz-header {
  margin-bottom: 24px;
}

.quiz-header h3 {
  font-size: 1.4rem;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.quiz-header p {
  color: var(--text-muted);
  font-size: 0.92rem;
}

.quiz-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 20px;
}

.quiz-question {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 16px;
}

.quiz-question span.q-num {
  color: var(--accent-neon);
  margin-right: 6px;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}

.quiz-option {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 16px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
  font-size: 0.94rem;
  color: var(--text-main);
}

.quiz-option:hover:not(.disabled) {
  border-color: var(--accent-primary);
  background-color: rgba(16, 185, 129, 0.08);
}

.quiz-option.correct {
  background-color: rgba(16, 185, 129, 0.18) !important;
  border-color: var(--accent-primary) !important;
  color: var(--accent-neon) !important;
  font-weight: 600;
}

[data-theme="light"] .quiz-option.correct {
  color: #047857 !important;
}

.quiz-option.incorrect {
  background-color: rgba(244, 63, 94, 0.15) !important;
  border-color: var(--accent-rose) !important;
  color: #fb7185 !important;
}

[data-theme="light"] .quiz-option.incorrect {
  color: #e11d48 !important;
}

.quiz-option .opt-letter {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
  background-color: rgba(128, 128, 128, 0.15);
  padding: 2px 7px;
  border-radius: 4px;
}

.quiz-explanation {
  display: none;
  margin-top: 14px;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  background-color: var(--bg-card);
  border-left: 3px solid var(--accent-primary);
  color: var(--text-main);
}

.quiz-explanation.show {
  display: block;
}

.quiz-explanation strong {
  color: var(--text-main);
  display: block;
  margin-bottom: 4px;
}

/* Page Footer Navigation */
.page-nav-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 48px;
  padding: 24px 0;
  border-top: 1px solid var(--border-color);
  flex-wrap: wrap;
  gap: 16px;
}

.btn-nav {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.92rem;
  transition: all 0.2s ease;
}

.btn-nav:hover {
  border-color: var(--accent-primary);
  color: var(--accent-neon);
  text-decoration: none;
  transform: translateY(-2px);
}

/* GitHub Nav Link */
.nav-github-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-color);
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-main) !important;
  font-weight: 600;
  font-size: 0.88rem;
  transition: all 0.2s ease;
}

[data-theme="light"] .nav-github-link {
  background-color: #f1f5f9;
  border-color: #cbd5e1;
  color: #0f172a !important;
}

.nav-github-link:hover {
  background-color: rgba(16, 185, 129, 0.15);
  border-color: var(--accent-primary);
  color: var(--accent-neon) !important;
  text-decoration: none;
  transform: translateY(-1px);
}

/* Upstream Course & Repository Attribution Banner */
.reference-banner {
  background: linear-gradient(135deg, rgba(18, 26, 36, 0.95), rgba(10, 14, 20, 0.9));
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-left: 4px solid var(--accent-primary);
  border-radius: var(--radius-lg);
  padding: 22px 26px;
  margin: 0 auto 32px;
  max-width: 900px;
  text-align: left;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

[data-theme="light"] .reference-banner {
  background: linear-gradient(135deg, #ffffff, #f8fafc);
  border: 1px solid #e2e8f0;
  border-left: 4px solid var(--accent-primary);
}

.reference-banner::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 140px;
  height: 140px;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.1) 0%, transparent 70%);
  pointer-events: none;
}

.reference-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.4);
  color: var(--accent-mint);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 4px 10px;
  border-radius: 9999px;
  margin-bottom: 12px;
}

.reference-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px !important;
  max-width: 100% !important;
}

.reference-text strong {
  color: var(--text-main);
}

.reference-links {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.btn-ref {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  transition: all 0.2s ease;
}

.btn-ref:hover {
  border-color: var(--accent-primary);
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--accent-neon);
  text-decoration: none;
  transform: translateY(-1px);
}

.ref-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.78rem;
  color: var(--accent-neon);
  background-color: rgba(16, 185, 129, 0.12);
  padding: 6px 12px;
  border-radius: 9999px;
  font-weight: 600;
  border: 1px solid rgba(16, 185, 129, 0.35);
  margin-left: auto;
}

/* Site Footer */
.site-footer {
  margin-top: 64px;
  background-color: #06090d;
  border-top: 1px solid rgba(16, 185, 129, 0.2);
  padding: 48px 0 24px;
}

[data-theme="light"] .site-footer {
  background-color: #f1f5f9;
  border-top: 1px solid #e2e8f0;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.footer-brand {
  max-width: 480px;
}

.footer-brand h4 {
  font-size: 1.1rem;
  color: var(--text-main);
  margin-bottom: 10px;
  font-weight: 700;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

.footer-links-group {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
}

.footer-col h5 {
  color: var(--text-main);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 8px;
}

.footer-col ul li a, .footer-col ul li span {
  color: var(--text-muted);
  font-size: 0.88rem;
  transition: color 0.2s ease;
}

.footer-col ul li a:hover {
  color: var(--accent-neon);
  text-decoration: none;
}

.footer-bottom {
  border-top: 1px solid rgba(128, 128, 128, 0.2);
  padding-top: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.82rem;
}

.footer-stats-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: transform 0.2s ease;
}

.footer-stats-badge:hover {
  transform: translateY(-2px);
}

.footer-stats-badge img {
  border-radius: 4px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.35);
}

/* ==============================================================================
   GLOSSARY PAGE STYLES
   ============================================================================== */
.glossary-hero {
  padding: 40px 0 24px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.35);
  color: var(--accent-neon);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 5px 14px;
  border-radius: 9999px;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.glossary-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  max-width: 900px;
  margin: 28px auto 0;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.stat-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-primary);
}

.stat-num {
  display: block;
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--accent-neon);
  font-family: var(--font-mono);
  line-height: 1.2;
}

.stat-lbl {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 4px;
}

/* Alphabetical Jump Navigation */
.alphabet-nav-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--border-color);
  flex-wrap: wrap;
}

.alpha-label {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.alpha-links {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.alpha-jump-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 28px;
  padding: 0 6px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  text-decoration: none;
  transition: all 0.18s ease;
}

.alpha-jump-btn:hover {
  background: rgba(16, 185, 129, 0.15);
  border-color: var(--accent-primary);
  color: var(--accent-neon);
  text-decoration: none;
  transform: scale(1.08);
}

[data-theme="light"] .alpha-jump-btn {
  background: #f1f5f9;
  border-color: #cbd5e1;
  color: #475569;
}

/* Letter Section Divider */
.glossary-letter-group {
  margin-top: 36px;
  margin-bottom: 16px;
}

.glossary-letter-header {
  display: flex;
  align-items: center;
  gap: 16px;
}

.letter-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.25), rgba(5, 150, 105, 0.4));
  border: 1px solid var(--accent-primary);
  color: var(--accent-neon);
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 800;
}

.letter-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--border-color) 0%, transparent 100%);
}

/* Glossary Cards List */
.glossary-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 16px;
  margin-bottom: 60px;
}

.glossary-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
  position: relative;
}

.glossary-card:hover {
  border-color: rgba(16, 185, 129, 0.4);
  box-shadow: 0 4px 16px -2px rgba(16, 185, 129, 0.12);
}

.glossary-card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.glossary-term-wrap {
  flex: 1;
  min-width: 250px;
}

.glossary-term-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 4px;
  color: var(--text-main);
  font-family: var(--font-mono);
}

.glossary-term-title .term-anchor {
  color: var(--text-main);
  text-decoration: none;
}

.glossary-term-title .term-anchor:hover {
  color: var(--accent-neon);
  text-decoration: none;
}

.glossary-expansion {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent-mint);
  letter-spacing: -0.01em;
}

.glossary-card-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

/* Category Badges */
.glossary-cat-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 9999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.cat-embedded-hw {
  background: rgba(245, 158, 11, 0.15);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.35);
}

.cat-cpp-idiom {
  background: rgba(56, 189, 248, 0.15);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.35);
}

.cat-memory-storage {
  background: rgba(168, 85, 247, 0.15);
  color: #c084fc;
  border: 1px solid rgba(168, 85, 247, 0.35);
}

.cat-toolchain-standards {
  background: rgba(244, 63, 94, 0.15);
  color: #fb7185;
  border: 1px solid rgba(244, 63, 94, 0.35);
}

.cat-data-structures {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.35);
}

/* Copy Term Button */
.btn-copy-term {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-copy-term:hover {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-neon);
  border-color: var(--accent-primary);
}

.btn-copy-term.copied {
  background: var(--accent-primary);
  color: #06090d;
  border-color: var(--accent-primary);
}

.glossary-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.glossary-body {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.glossary-def strong {
  display: block;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  margin-bottom: 4px;
}

.glossary-def p {
  color: var(--text-main);
  font-size: 0.95rem;
  line-height: 1.6;
}

.glossary-hw-box {
  background: rgba(16, 185, 129, 0.06);
  border-left: 3px solid var(--accent-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 12px 16px;
}

.hw-box-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent-neon);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.glossary-hw-box p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin: 0;
}

.glossary-hw-box code, .glossary-def code {
  background: rgba(0, 0, 0, 0.4);
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-size: 0.85em;
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

[data-theme="light"] .glossary-hw-box code, 
[data-theme="light"] .glossary-def code {
  background: #f1f5f9;
  color: #0369a1;
  border-color: #cbd5e1;
}

.glossary-footer {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.rel-label {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.rel-links-list {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.glossary-project-link {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent-mint);
  background: rgba(5, 150, 105, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: all 0.2s ease;
}

.glossary-project-link:hover {
  background: rgba(16, 185, 129, 0.22);
  color: var(--accent-neon);
  border-color: var(--accent-neon);
  text-decoration: none;
  transform: translateY(-1px);
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .hero h1 { font-size: 1.85rem; }
  .cards-grid { grid-template-columns: 1fr; }
  .project-title { font-size: 1.7rem; }
  .content-card { padding: 20px; }
  .reference-links { flex-direction: column; align-items: flex-start; }
  .ref-pill { margin-left: 0; }
  .footer-content { flex-direction: column; gap: 28px; }
  .glossary-card-top { flex-direction: column; }
  .glossary-card-meta { width: 100%; justify-content: space-between; }
  .glossary-stats-grid { grid-template-columns: 1fr 1fr; }
}