/* ============================================
   CCA Prep Hub — Styles
   ============================================ */

:root {
  --color-bg: #0a0a0f;
  --color-bg-alt: #111118;
  --color-surface: #1a1a24;
  --color-surface-hover: #22222e;
  --color-border: #2a2a3a;
  --color-border-light: #33334a;
  --color-text: #e8e8f0;
  --color-text-secondary: #9898b0;
  --color-text-muted: #6868808a;
  --color-primary: #c084fc;
  --color-primary-dim: #a855f7;
  --color-primary-glow: rgba(168, 85, 247, 0.15);
  --color-accent: #818cf8;
  --color-accent-dim: #6366f1;
  --color-success: #34d399;
  --color-success-bg: rgba(52, 211, 153, 0.1);
  --color-danger: #f87171;
  --color-danger-bg: rgba(248, 113, 113, 0.1);
  --color-warning: #fbbf24;
  --color-warning-bg: rgba(251, 191, 36, 0.1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}

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

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: rgba(168, 85, 247, 0.12);
  color: var(--color-primary);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

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

/* ============================================
   Navigation
   ============================================ */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 15, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition);
}

.navbar.scrolled {
  background: rgba(10, 10, 15, 0.95);
  box-shadow: var(--shadow-md);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

.logo-icon {
  color: var(--color-primary);
  font-size: 1.3rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-links a {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.nav-links a:hover {
  color: var(--color-text);
  background: var(--color-surface);
}

.nav-cta {
  background: var(--color-primary-dim) !important;
  color: white !important;
  font-weight: 600 !important;
  padding: 8px 16px !important;
  border-radius: var(--radius-md) !important;
}

.nav-cta:hover {
  background: var(--color-primary) !important;
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
  position: relative;
  padding: 160px 0 100px;
  overflow: hidden;
  text-align: center;
}

.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(168, 85, 247, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(168, 85, 247, 0.05) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.hero::after {
  content: '';
  position: absolute;
  top: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  background: var(--color-primary-glow);
  border: 1px solid rgba(168, 85, 247, 0.3);
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: 0.05em;
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.gradient-text {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent), #38bdf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  max-width: 680px;
  margin: 0 auto 36px;
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 60px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary-dim), var(--color-accent-dim));
  color: white;
  box-shadow: 0 4px 16px rgba(168, 85, 247, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(168, 85, 247, 0.4);
  color: white;
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-border-light);
  color: var(--color-text);
}

.btn-lg {
  padding: 14px 36px;
  font-size: 1rem;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  max-width: 600px;
  margin: 0 auto;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  font-weight: 500;
  margin-top: 4px;
}

/* ============================================
   Sections
   ============================================ */

.section {
  padding: 100px 0;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-tag {
  display: inline-block;
  padding: 4px 14px;
  background: var(--color-primary-glow);
  border: 1px solid rgba(168, 85, 247, 0.2);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section-header h2 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-header p {
  max-width: 700px;
  margin: 0 auto;
  color: var(--color-text-secondary);
  font-size: 1.05rem;
}

/* ============================================
   Overview Section
   ============================================ */

.overview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-bottom: 48px;
}

.overview-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
}

.overview-card:hover {
  border-color: var(--color-border-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.overview-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.overview-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.overview-card p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

.tech-stack {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
}

.tech-stack h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--color-text-secondary);
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

.tech-tag {
  padding: 6px 16px;
  background: var(--color-primary-glow);
  border: 1px solid rgba(168, 85, 247, 0.2);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-primary);
  font-family: var(--font-mono);
}

/* ============================================
   Domains Section
   ============================================ */

.domains-grid {
  display: grid;
  gap: 20px;
  margin-bottom: 48px;
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .domains-grid {
    grid-template-columns: repeat(12, 1fr);
    grid-template-rows: auto auto;
  }
  .dg-d1 { grid-column: span 5; }
  .dg-d2 { grid-column: span 4; }
  .dg-d5 { grid-column: span 3; }
  .dg-d3 { grid-column: span 6; }
  .dg-d4 { grid-column: span 6; }

  .dg-d1 .domain-weight { font-size: 1.6rem; }
  .dg-d3 .domain-weight,
  .dg-d4 .domain-weight { font-size: 1.3rem; }
  .dg-d2 .domain-weight { font-size: 1.15rem; }
  .dg-d5 .domain-weight { font-size: 1rem; }

  .dg-d5 h3 { font-size: 1.05rem; }
  .dg-d5 > p { font-size: 0.84rem; }
  .dg-d5 .domain-topics li { font-size: 0.82rem; }
}

.domain-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.domain-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary-dim), var(--color-accent));
  opacity: 0;
  transition: opacity var(--transition);
}

.domain-card:hover {
  border-color: var(--color-border-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.domain-card:hover::before {
  opacity: 1;
}

.domain-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.domain-number {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-primary-glow);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}

.domain-weight {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--color-accent);
}

.domain-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.domain-card > p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  margin-bottom: 20px;
}

.domain-topics h4 {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.domain-topics ul {
  list-style: none;
}

.domain-topics li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 8px;
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.domain-topics li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 700;
}

/* Weight Chart */
.domain-weight-chart {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.domain-weight-chart h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 24px;
  text-align: center;
  color: var(--color-text-secondary);
}

.weight-bars {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.weight-bar-item {
  display: flex;
  align-items: center;
  gap: 16px;
}

.weight-label {
  flex-shrink: 0;
  width: 200px;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  text-align: right;
}

.weight-bar-track {
  flex: 1;
  height: 28px;
  background: rgba(168, 85, 247, 0.08);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.weight-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary-dim), var(--color-accent));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 12px;
  width: 0;
  transition: width 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.weight-bar-fill.animated {
  width: var(--target-width);
}

.weight-bar-fill span {
  font-size: 0.8rem;
  font-weight: 700;
  color: white;
}

/* ============================================
   Scenarios Section
   ============================================ */

.scenarios-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.scenario-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
}

.scenario-card:hover {
  border-color: var(--color-border-light);
}

.scenario-header {
  padding: 24px 28px;
  cursor: pointer;
  transition: background var(--transition);
}

.scenario-header:hover {
  background: var(--color-surface-hover);
}

.scenario-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.scenario-header h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.scenario-header p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  margin-bottom: 14px;
  line-height: 1.6;
}

.scenario-domains {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.scenario-domains span {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  background: var(--color-primary-glow);
  border-radius: 999px;
  color: var(--color-primary);
}

.scenario-toggle {
  background: none;
  border: none;
  color: var(--color-accent);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0;
  transition: color var(--transition);
}

.scenario-toggle:hover {
  color: var(--color-primary);
}

.scenario-details {
  display: none;
  padding: 0 28px 28px;
  border-top: 1px solid var(--color-border);
}

.scenario-card.open .scenario-details {
  display: block;
}

.scenario-card.open .scenario-toggle {
  display: none;
}

.decision-grid {
  display: grid;
  gap: 20px;
  padding-top: 24px;
}

@media (min-width: 768px) {
  .decision-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.decision-item {
  background: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 20px;
}

.decision-item h4 {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-text);
}

.decision-correct,
.decision-wrong {
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  line-height: 1.5;
  margin-bottom: 8px;
}

.decision-correct {
  background: var(--color-success-bg);
  border-left: 3px solid var(--color-success);
}

.decision-wrong {
  background: var(--color-danger-bg);
  border-left: 3px solid var(--color-danger);
}

.badge-correct,
.badge-wrong {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 3px;
  margin-right: 6px;
}

.badge-correct {
  background: rgba(52, 211, 153, 0.2);
  color: var(--color-success);
}

.badge-wrong {
  background: rgba(248, 113, 113, 0.2);
  color: var(--color-danger);
}

/* ============================================
   Anti-Patterns Section
   ============================================ */

.anti-pattern-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-bottom: 32px;
}

.filter-btn {
  padding: 8px 18px;
  font-size: 0.85rem;
  font-weight: 600;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}

.filter-btn:hover {
  border-color: var(--color-border-light);
  color: var(--color-text);
}

.filter-btn.active {
  background: var(--color-primary-glow);
  border-color: rgba(168, 85, 247, 0.3);
  color: var(--color-primary);
}

.anti-patterns-grid {
  display: grid;
  gap: 12px;
}

@media (min-width: 768px) {
  .anti-patterns-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.ap-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: all 0.3s ease;
}

.ap-card.hidden {
  display: none;
}

.ap-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.ap-severity {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.ap-severity.critical {
  background: var(--color-danger-bg);
  color: var(--color-danger);
}

.ap-severity.high {
  background: var(--color-warning-bg);
  color: var(--color-warning);
}

.ap-severity.medium {
  background: rgba(96, 165, 250, 0.1);
  color: #60a5fa;
}

.ap-domain {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-text-muted);
}

.ap-wrong,
.ap-right {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 8px 0;
}

.ap-icon {
  flex-shrink: 0;
  font-weight: 700;
  font-size: 0.85rem;
}

.ap-wrong .ap-icon { color: var(--color-danger); }
.ap-right .ap-icon { color: var(--color-success); }

.ap-wrong p,
.ap-right p {
  font-size: 0.85rem;
  line-height: 1.5;
}

.ap-wrong p { color: var(--color-text-secondary); }
.ap-right p { color: var(--color-text); }

/* ============================================
   Quiz Section
   ============================================ */

.quiz-container {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.quiz-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.quiz-scenario {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-primary);
}

.quiz-num {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}

.quiz-body {
  padding: 24px;
}

.quiz-question {
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 20px;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}

.quiz-option {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition);
  font-size: 0.9rem;
  line-height: 1.6;
}

.quiz-option:hover {
  border-color: var(--color-border-light);
  background: var(--color-surface-hover);
}

.quiz-option input[type="radio"] {
  display: none;
}

.option-marker {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: 50%;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-text-secondary);
  transition: all var(--transition);
}

.quiz-option.selected .option-marker {
  border-color: var(--color-primary);
  background: var(--color-primary-glow);
  color: var(--color-primary);
}

.quiz-option.selected {
  border-color: rgba(168, 85, 247, 0.3);
  background: rgba(168, 85, 247, 0.05);
}

.quiz-option.correct-answer {
  border-color: var(--color-success) !important;
  background: var(--color-success-bg) !important;
}

.quiz-option.correct-answer .option-marker {
  border-color: var(--color-success);
  background: rgba(52, 211, 153, 0.2);
  color: var(--color-success);
}

.quiz-option.wrong-answer {
  border-color: var(--color-danger) !important;
  background: var(--color-danger-bg) !important;
}

.quiz-option.wrong-answer .option-marker {
  border-color: var(--color-danger);
  background: rgba(248, 113, 113, 0.2);
  color: var(--color-danger);
}

.quiz-submit {
  padding: 10px 24px;
  background: linear-gradient(135deg, var(--color-primary-dim), var(--color-accent-dim));
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}

.quiz-submit:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(168, 85, 247, 0.3);
}

.quiz-submit:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.quiz-explanation {
  display: none;
  margin-top: 20px;
  padding: 20px;
  background: rgba(168, 85, 247, 0.05);
  border: 1px solid rgba(168, 85, 247, 0.15);
  border-radius: var(--radius-md);
}

.quiz-explanation h4 {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.quiz-explanation p {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.quiz-score {
  display: none;
  text-align: center;
  padding: 48px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-top: 32px;
}

.quiz-score h3 {
  font-size: 1.3rem;
  margin-bottom: 16px;
}

.score-display {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
  margin-bottom: 16px;
}

.score-number {
  font-size: 4rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.score-total {
  font-size: 1.5rem;
  color: var(--color-text-muted);
  font-weight: 600;
}

#scoreMessage {
  color: var(--color-text-secondary);
  font-size: 1rem;
}

/* ============================================
   Preparation Section
   ============================================ */

.prep-timeline {
  position: relative;
  padding-left: 36px;
  margin-bottom: 60px;
}

.prep-timeline::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--color-primary-dim), var(--color-accent-dim), transparent);
}

.prep-step {
  position: relative;
  display: flex;
  gap: 20px;
  align-items: flex-start;
  margin-bottom: 36px;
}

.prep-step:last-child {
  margin-bottom: 0;
}

.prep-step-num {
  position: absolute;
  left: -36px;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-alt);
  border: 2px solid var(--color-primary-dim);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-primary);
}

.prep-step-content {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  flex: 1;
  transition: all var(--transition);
}

.prep-step-content:hover {
  border-color: var(--color-border-light);
  box-shadow: var(--shadow-sm);
}

.prep-step-content h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.prep-step-content p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
}

.prep-domains {
  font-size: 0.8rem;
  color: var(--color-primary);
  font-weight: 500;
}

.prep-resources h3 {
  text-align: center;
  font-size: 1.2rem;
  margin-bottom: 24px;
}

.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.resource-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all var(--transition);
  color: var(--color-text);
  text-decoration: none;
}

.resource-card:hover {
  border-color: var(--color-border-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  color: var(--color-text);
}

.resource-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.resource-card h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.resource-card p {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* ============================================
   CTA Section
   ============================================ */

.cta-section {
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.08), rgba(99, 102, 241, 0.08));
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.cta-content {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.cta-content h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-content p {
  color: var(--color-text-secondary);
  font-size: 1.05rem;
  margin-bottom: 32px;
}

.cta-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================
   Footer
   ============================================ */

.footer {
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  padding: 60px 0 32px;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
}

.footer-info p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
  max-width: 400px;
}

.footer-links h4 {
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-text);
}

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

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.footer-bottom a {
  color: var(--color-text-secondary);
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 16px 24px;
    gap: 4px;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    padding: 10px 12px;
    width: 100%;
  }

  .hero {
    padding: 120px 0 60px;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .stat-number {
    font-size: 2rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .weight-bar-item {
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
  }

  .weight-label {
    width: auto;
    text-align: left;
    font-size: 0.8rem;
  }

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

  .footer-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

@media (max-width: 480px) {
  .section {
    padding: 60px 0;
  }

  .container {
    padding: 0 16px;
  }

  .hero-title {
    font-size: 1.8rem;
  }

  .section-header h2 {
    font-size: 1.5rem;
  }
}

/* ============================================
   Animations
   ============================================ */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  opacity: 0;
  animation: fadeInUp 0.6s ease forwards;
}

.fade-in:nth-child(2) { animation-delay: 0.1s; }
.fade-in:nth-child(3) { animation-delay: 0.2s; }
.fade-in:nth-child(4) { animation-delay: 0.3s; }
.fade-in:nth-child(5) { animation-delay: 0.4s; }

/* ============================================
   Domain Detail Pages
   ============================================ */

.domain-page-hero {
  padding: 120px 0 60px;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
}

.domain-page-hero::before {
  content: '';
  position: absolute;
  top: -30%;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.domain-page-hero .container {
  position: relative;
  z-index: 1;
}

.domain-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

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

.domain-breadcrumb a:hover {
  color: var(--color-primary);
}

.domain-breadcrumb .sep {
  color: var(--color-border-light);
}

.domain-page-hero .domain-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.domain-page-hero .domain-badge .domain-number {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-primary-glow);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
}

.domain-page-hero .domain-badge .domain-weight {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-accent);
  background: rgba(129, 140, 248, 0.1);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
}

.domain-page-hero h1 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.domain-page-hero .domain-desc {
  max-width: 720px;
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* Domain Page Sidebar + Content Layout */
.domain-page-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 48px;
  padding: 48px 0 100px;
}

.domain-sidebar {
  position: sticky;
  top: 80px;
  align-self: start;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
}

.sidebar-domain-tree {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sd-group {
  border-radius: var(--radius-md);
}

.sd-title {
  display: block;
  padding: 10px 14px;
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  cursor: pointer;
}

.sd-title:hover {
  color: var(--color-text-secondary);
  background: var(--color-surface);
}

.sd-group.current > .sd-title {
  color: var(--color-primary);
}

.sd-group .domain-sidebar-nav {
  list-style: none;
  display: none;
  flex-direction: column;
  gap: 1px;
  padding: 2px 0 8px 0;
}

.sd-group.open .domain-sidebar-nav {
  display: flex;
}

.domain-sidebar-nav a {
  display: block;
  padding: 6px 14px 6px 28px;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  transition: all var(--transition);
  line-height: 1.4;
}

.domain-sidebar-nav a:hover {
  color: var(--color-text);
  background: var(--color-surface);
  border-left-color: var(--color-border-light);
}

.domain-sidebar-nav a.active {
  color: var(--color-primary);
  background: var(--color-primary-glow);
  border-left-color: var(--color-primary);
  font-weight: 600;
}

/* Task Statement Sections */
.task-section {
  margin-bottom: 64px;
  scroll-margin-top: 90px;
}

.task-section-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
}

.task-id {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-primary-glow);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.task-section-header h2 {
  font-size: 1.4rem;
  font-weight: 700;
}

/* Content prose */
.task-content h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 28px 0 12px;
  color: var(--color-text);
}

.task-content p {
  margin-bottom: 14px;
  color: var(--color-text-secondary);
  font-size: 0.92rem;
  line-height: 1.75;
}

.task-content ul, .task-content ol {
  margin: 0 0 16px 0;
  padding-left: 20px;
}

.task-content li {
  margin-bottom: 8px;
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

.task-content strong {
  color: var(--color-text);
  font-weight: 600;
}

/* Key Concept Box */
.key-concept {
  background: var(--color-primary-glow);
  border: 1px solid rgba(168, 85, 247, 0.2);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 20px 0;
}

.key-concept-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.key-concept p {
  color: var(--color-text) !important;
  font-size: 0.92rem;
  margin-bottom: 0 !important;
}

/* Exam Trap Box */
.exam-trap {
  background: var(--color-danger-bg);
  border: 1px solid rgba(248, 113, 113, 0.15);
  border-left: 4px solid var(--color-danger);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 16px 0;
}

.exam-trap-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-danger);
  margin-bottom: 8px;
}

.exam-trap p {
  color: var(--color-text-secondary);
  font-size: 0.88rem;
  margin-bottom: 0;
  line-height: 1.6;
}

.exam-trap .trap-wrong {
  color: var(--color-danger);
  font-weight: 600;
}

.exam-trap .trap-right {
  color: var(--color-success);
  font-weight: 600;
}

/* Practice Scenario Box */
.practice-scenario {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin: 24px 0;
}

.practice-scenario-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.practice-scenario .scenario-q {
  font-size: 0.92rem;
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: 16px;
}

.practice-options {
  list-style: none;
  padding: 0;
  margin: 0 0 16px;
}

.practice-options li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 14px;
  margin-bottom: 6px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  border: 1px solid transparent;
  transition: all var(--transition);
  line-height: 1.55;
}

.practice-options li:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-border);
}

.practice-options li .opt-letter {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  color: var(--color-text-secondary);
}

.practice-options li.selected {
  background: rgba(168, 85, 247, 0.06);
  border-color: rgba(168, 85, 247, 0.2);
}

.practice-options li.selected .opt-letter {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.practice-options li.reveal-correct {
  background: var(--color-success-bg);
  border-color: var(--color-success);
}

.practice-options li.reveal-correct .opt-letter {
  border-color: var(--color-success);
  color: var(--color-success);
}

.practice-options li.reveal-wrong {
  background: var(--color-danger-bg);
  border-color: var(--color-danger);
}

.practice-options li.reveal-wrong .opt-letter {
  border-color: var(--color-danger);
  color: var(--color-danger);
}

.practice-check-btn {
  padding: 8px 20px;
  background: linear-gradient(135deg, var(--color-primary-dim), var(--color-accent-dim));
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}

.practice-check-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(168, 85, 247, 0.3);
}

.practice-check-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.practice-explanation {
  display: none;
  margin-top: 16px;
  padding: 16px 20px;
  background: rgba(168, 85, 247, 0.05);
  border: 1px solid rgba(168, 85, 247, 0.12);
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

.practice-explanation.visible {
  display: block;
}

/* Code blocks in domain pages */
.task-content pre {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  overflow-x: auto;
  margin: 16px 0;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: var(--color-text);
  line-height: 1.6;
}

/* Domain navigation footer */
.domain-nav-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
  margin-top: 48px;
}

.domain-nav-link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
  text-decoration: none;
  max-width: 45%;
}

.domain-nav-link:hover {
  border-color: var(--color-border-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.domain-nav-link .nav-dir {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
}

.domain-nav-link .nav-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
}

.domain-nav-link.next {
  text-align: right;
  margin-left: auto;
}

/* Homepage Deep Dive Section */
.deep-dive-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.deep-dive-card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-decoration: none;
  color: var(--color-text);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.deep-dive-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary-dim), var(--color-accent));
  opacity: 0;
  transition: opacity var(--transition);
}

.deep-dive-card:hover {
  border-color: var(--color-border-light);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  color: var(--color-text);
}

.deep-dive-card:hover::before {
  opacity: 1;
}

.deep-dive-card .dd-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.deep-dive-card .dd-num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-primary-glow);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
}

.deep-dive-card .dd-weight {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-accent);
}

.deep-dive-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.deep-dive-card p {
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  flex: 1;
}

.deep-dive-card .dd-tasks {
  margin-top: 14px;
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

.deep-dive-card .dd-arrow {
  margin-top: 14px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-primary);
}

@media (max-width: 900px) {
  .domain-page-layout {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .domain-sidebar {
    display: none;
  }
}

@media (max-width: 768px) {
  .domain-page-hero {
    padding: 100px 0 40px;
  }
  .domain-nav-footer {
    flex-direction: column;
    gap: 12px;
  }
  .domain-nav-link {
    max-width: 100%;
    width: 100%;
  }
  .domain-nav-link.next {
    text-align: left;
  }
}

/* ============================================
   Quick Links Hub (Homepage)
   ============================================ */

.quick-links-section {
  padding: 60px 0;
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}

.quick-links-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.quick-link-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--color-text);
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}

.quick-link-card::after {
  content: '→';
  position: absolute;
  right: 20px;
  font-size: 1.1rem;
  color: var(--color-text-muted);
  transition: all 0.25s ease;
}

.quick-link-card:hover {
  border-color: var(--color-primary-dim);
  background: var(--color-surface-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  color: var(--color-text);
}

.quick-link-card:hover::after {
  color: var(--color-primary);
  right: 16px;
}

.quick-link-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-glow);
  border-radius: var(--radius-md);
  font-size: 1.4rem;
}

.quick-link-text h3 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 2px;
}

.quick-link-text p {
  font-size: 0.78rem;
  color: var(--color-text-secondary);
  line-height: 1.4;
}

@media (max-width: 900px) {
  .quick-links-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 580px) {
  .quick-links-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   Sub-page Article Styles
   ============================================ */

.article-hero {
  padding: 120px 0 48px;
  border-bottom: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
}

.article-hero::before {
  content: '';
  position: absolute;
  top: -30%;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.article-hero .container {
  position: relative;
  z-index: 1;
}

.article-hero h1 {
  font-size: clamp(2rem, 4vw, 2.6rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.article-hero .article-lead {
  max-width: 720px;
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  line-height: 1.75;
}

.article-body {
  padding: 60px 0 100px;
}

.article-body .container {
  max-width: 820px;
}

.article-body .container:has(.ec-page-layout) {
  max-width: 1100px;
}

.article-body h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 48px 0 16px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.article-body h2:first-of-type {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.article-body h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 28px 0 10px;
}

.article-body p {
  font-size: 0.94rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.article-body ul, .article-body ol {
  margin: 0 0 20px;
  padding-left: 22px;
}

.article-body li {
  font-size: 0.94rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 10px;
}

.article-body strong {
  color: var(--color-text);
  font-weight: 600;
}

.article-body blockquote {
  margin: 24px 0;
  padding: 20px 24px;
  background: var(--color-primary-glow);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
}

.article-body blockquote p {
  color: var(--color-text);
  margin-bottom: 0;
}

.info-table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}

.info-table th,
.info-table td {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.9rem;
}

.info-table th {
  color: var(--color-text-secondary);
  font-weight: 600;
  width: 35%;
  white-space: nowrap;
}

.info-table td {
  color: var(--color-text);
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  margin: 24px 0;
}

.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
}

.stat-card .sc-number {
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
}

.stat-card .sc-label {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  margin-top: 4px;
  display: block;
}

.article-cta {
  margin-top: 48px;
  padding: 32px;
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.08), rgba(99, 102, 241, 0.08));
  border: 1px solid rgba(168, 85, 247, 0.15);
  border-radius: var(--radius-lg);
  text-align: center;
}

.article-cta h3 {
  margin-top: 0 !important;
  font-size: 1.2rem;
}

.article-cta p {
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

.article-cta .btn {
  margin: 0 6px;
}

.back-home {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

.back-home:hover {
  color: var(--color-primary);
}

/* Exam Content Page Layout */
.ec-page-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 48px;
  align-items: start;
}

.ec-sidebar {
  position: sticky;
  top: 80px;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  padding-bottom: 24px;
}

.ec-sidebar::-webkit-scrollbar {
  width: 3px;
}

.ec-sidebar::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

.ec-nav-link {
  display: block;
  padding: 8px 14px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  transition: all var(--transition);
  text-decoration: none;
}

.ec-nav-link:hover {
  color: var(--color-text);
  background: var(--color-surface);
}

.ec-nav-link.active {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  font-weight: 600;
}

.ec-sidebar .sd-group {
  margin: 2px 0;
}

.ec-sidebar .sd-title {
  font-size: 0.82rem;
  font-weight: 500;
  padding: 8px 14px;
}

.ec-sidebar .domain-sidebar-nav a {
  font-size: 0.78rem;
  padding: 5px 14px 5px 30px;
}

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

.ec-main h2[id],
.ec-main h3[id],
.ec-main .ec-task[id] {
  scroll-margin-top: 90px;
}

.ec-task {
  padding: 12px 16px;
  margin: 6px 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-primary-dim);
}

.ec-task strong {
  color: var(--color-text);
}

.ec-task code {
  font-size: 0.82em;
  padding: 1px 5px;
  background: rgba(168, 85, 247, 0.1);
  border-radius: 3px;
  color: var(--color-primary);
}

@media (max-width: 900px) {
  .ec-page-layout {
    grid-template-columns: 1fr;
  }
  .ec-sidebar {
    display: none;
  }
}

/* Domain Card Grid (exam-content page) */
.domain-card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 24px 0;
}

.domain-card {
  display: flex;
  flex-direction: column;
  padding: 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--color-text);
  transition: all 0.25s ease;
  position: relative;
}

.domain-card:hover {
  border-color: var(--color-primary-dim);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  color: var(--color-text);
}

.domain-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.domain-card-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--color-primary-glow);
  border: 1px solid rgba(168, 85, 247, 0.25);
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-primary);
  font-family: var(--font-mono);
}

.domain-card-weight {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--color-primary);
  font-family: var(--font-mono);
}

.domain-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
  line-height: 1.3;
}

.domain-card p {
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
  flex: 1;
}

.domain-card-meta {
  display: block;
  margin-top: 14px;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.domain-card-arrow {
  display: inline-block;
  margin-top: 10px;
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--color-primary);
  transition: transform 0.2s ease;
}

.domain-card:hover .domain-card-arrow {
  transform: translateX(4px);
}

.ec-main .domain-card-grid {
  grid-template-columns: repeat(2, 1fr);
}

@media (min-width: 1100px) {
  .ec-main .domain-card-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 900px) {
  .domain-card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 560px) {
  .domain-card-grid {
    grid-template-columns: 1fr;
  }
}

/* Featured Duo (Homepage) */
.featured-duo {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.featured-card {
  display: flex;
  flex-direction: column;
  padding: 32px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--color-text);
  transition: all 0.25s ease;
}

.featured-card:hover {
  border-color: var(--color-primary-dim);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  color: var(--color-text);
}

.featured-card-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.featured-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.featured-card > p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.featured-list {
  list-style: none;
  flex: 1;
  margin-bottom: 20px;
}

.featured-list li {
  position: relative;
  padding: 5px 0 5px 18px;
  font-size: 0.84rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
}

.featured-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-size: 0.8rem;
}

.featured-arrow {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
  transition: transform 0.2s ease;
}

.featured-card:hover .featured-arrow {
  transform: translateX(4px);
}

@media (max-width: 700px) {
  .featured-duo {
    grid-template-columns: 1fr;
  }
}

/* ── Bottom Navigation Module ── */
.bottom-nav-module {
  padding: 60px 0;
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
}

.bottom-nav-module .container {
  max-width: 1100px;
}

.bottom-nav-module h2 {
  text-align: center;
  font-size: 1.6rem;
  margin-bottom: 8px;
  color: var(--color-text);
}

.bottom-nav-subtitle {
  text-align: center;
  color: var(--color-muted);
  font-size: 0.95rem;
  margin-bottom: 36px;
}

.bottom-nav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}

.bottom-nav-card {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 20px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--color-text);
  transition: all 0.25s ease;
}

.bottom-nav-card:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-glow);
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(168, 85, 247, 0.12);
}

.bottom-nav-card.current-page {
  opacity: 0.45;
  pointer-events: none;
  position: relative;
}

.bottom-nav-card.current-page::after {
  content: 'You are here';
  position: absolute;
  top: 8px;
  right: 10px;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary);
  font-weight: 600;
}

.bnc-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--color-primary-glow);
  font-size: 1.2rem;
}

.bnc-text h3 {
  font-size: 0.92rem;
  font-weight: 600;
  margin-bottom: 3px;
  line-height: 1.3;
}

.bnc-text p {
  font-size: 0.78rem;
  color: var(--color-muted);
  line-height: 1.4;
  margin: 0;
}

@media (max-width: 600px) {
  .bottom-nav-grid {
    grid-template-columns: 1fr;
  }
  .bottom-nav-module {
    padding: 40px 0;
  }
}

.domain-study-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 8px;
  padding: 8px 16px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-glow);
  border: 1px solid rgba(168, 85, 247, 0.2);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all 0.2s ease;
}

.domain-study-link:hover {
  background: rgba(168, 85, 247, 0.15);
  border-color: var(--color-primary);
  transform: translateX(4px);
  color: var(--color-primary);
}