:root {
  /* Colors - Light Theme (Default) */
  --primary: #1e3a8a;          /* Deep Blue */
  --primary-hover: #172554;
  --primary-light: #3b82f6;
  --accent: #0284c7;           /* Sky Blue */
  --accent-light: #e0f2fe;
  --accent-glow: rgba(2, 132, 199, 0.25);
  
  --bg-body: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.85);
  --bg-muted: #f1f5f9;
  
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --text-inverse: #ffffff;
  
  --border-color: #e2e8f0;
  --border-focus: #3b82f6;
  
  --success: #10b981;
  --success-bg: #ecfdf5;
  --warning: #f59e0b;
  --warning-bg: #fffbeb;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 14px -2px rgba(0,0,0,0.08), 0 2px 6px -1px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 28px -4px rgba(0,0,0,0.12), 0 6px 12px -2px rgba(0,0,0,0.06);
  --shadow-xl: 0 20px 35px -5px rgba(0,0,0,0.15), 0 10px 15px -3px rgba(0,0,0,0.08);

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.18s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
  --primary: #3b82f6;
  --primary-hover: #60a5fa;
  --primary-light: #93c5fd;
  --accent: #38bdf8;
  --accent-light: rgba(56, 189, 248, 0.15);
  --accent-glow: rgba(56, 189, 248, 0.3);
  
  --bg-body: #0b0f19;
  --bg-surface: #131b2e;
  --bg-surface-elevated: #1a243d;
  --bg-glass: rgba(19, 27, 46, 0.88);
  --bg-muted: #1e293b;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-light: #64748b;
  --text-inverse: #0b0f19;
  
  --border-color: #24324f;
  --border-focus: #60a5fa;
  
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 14px -2px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 28px -4px rgba(0,0,0,0.5);
  --shadow-xl: 0 20px 35px -5px rgba(0,0,0,0.6);
}

/* Reset & Base */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.65;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 9px;
}
::-webkit-scrollbar-track {
  background: var(--bg-body);
}
::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

/* Reading Progress Bar */
#reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 4px;
  width: 0%;
  background: linear-gradient(90deg, #3b82f6, #06b6d4, #10b981);
  z-index: 1100;
  transition: width 0.1s ease-out;
}

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

/* Typography Helpers */
h1, h2, h3, h4 {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-main);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 50px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.825rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-light);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.2rem;
  margin-bottom: 12px;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* Header & Navigation */
header {
  position: sticky;
  top: 0;
  background: var(--bg-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: all var(--transition-normal);
}

header.scrolled {
  box-shadow: var(--shadow-md);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  text-decoration: none;
  font-family: 'Outfit', sans-serif;
}

.logo-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #1e3a8a, #0284c7);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: 0 4px 10px var(--accent-glow);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.95rem;
  transition: color var(--transition-fast);
  position: relative;
  padding: 6px 0;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent);
  border-radius: var(--radius-full);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.icon-btn {
  background: var(--bg-muted);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1rem;
  transition: all var(--transition-fast);
  position: relative;
}

.icon-btn:hover {
  background: var(--accent-light);
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-2px);
}

.search-trigger-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border-radius: var(--radius-md);
  background: var(--bg-muted);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.search-trigger-btn:hover {
  border-color: var(--accent);
  color: var(--text-main);
}

.search-trigger-btn kbd {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 2px 6px;
  font-size: 0.75rem;
  font-family: monospace;
}

.mobile-toggle {
  display: none;
}

/* Sidebar / Mobile Menu */
.sidebar-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  z-index: 1050;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.sidebar-overlay.active {
  opacity: 1;
  visibility: visible;
}

.sidebar {
  position: fixed;
  top: 0;
  right: -320px;
  width: 300px;
  height: 100%;
  background: var(--bg-surface);
  box-shadow: var(--shadow-xl);
  padding: 30px 24px;
  z-index: 1060;
  transition: right var(--transition-slow);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.sidebar.active {
  right: 0;
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sidebar-links a {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 16px;
  color: var(--text-main);
  text-decoration: none;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.sidebar-links a:hover,
.sidebar-links a.active {
  background: var(--accent-light);
  color: var(--accent);
}

.sidebar-footer {
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
}

/* Hero Section */
.hero {
  position: relative;
  padding: 90px 0 80px;
  background: radial-gradient(circle at 80% 20%, var(--accent-light) 0%, transparent 40%),
              radial-gradient(circle at 10% 80%, rgba(30, 58, 138, 0.08) 0%, transparent 40%);
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
}

.hero-content {
  max-width: 620px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent-light);
  color: var(--accent);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 20px;
  border: 1px solid rgba(2, 132, 199, 0.2);
}

.hero-badge i {
  color: var(--accent);
}

.hero h1 {
  font-size: 3.2rem;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero h1 .gradient-text {
  background: linear-gradient(135deg, #1e3a8a, #0284c7, #06b6d4);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

[data-theme="dark"] .hero h1 .gradient-text {
  background: linear-gradient(135deg, #60a5fa, #38bdf8, #a7f3d0);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 40px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, #1e3a8a, #0284c7);
  color: #ffffff;
  box-shadow: 0 4px 14px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px var(--accent-glow);
  color: #ffffff;
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-main);
  border-color: var(--border-color);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: var(--bg-muted);
  border-color: var(--text-muted);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
}

/* Quick Stats */
.hero-stats {
  display: flex;
  gap: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

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

.stat-number {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-main);
  font-family: 'Outfit', sans-serif;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Hero Visual Card */
.hero-visual {
  position: relative;
}

.profile-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 30px;
  box-shadow: var(--shadow-xl);
  position: relative;
  overflow: hidden;
}

.profile-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: linear-gradient(90deg, #1e3a8a, #0284c7, #10b981);
}

.profile-header {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 20px;
}

.profile-avatar {
  width: 76px;
  height: 76px;
  border-radius: 50%;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 14px var(--accent-glow);
  flex-shrink: 0;
  border: 3px solid var(--accent-light);
  cursor: pointer;
}

.profile-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform var(--transition-normal);
}

.profile-avatar:hover img {
  transform: scale(1.1);
}

.profile-info h3 {
  font-size: 1.25rem;
  margin-bottom: 4px;
}

.profile-role {
  font-size: 0.9rem;
  color: var(--accent);
  font-weight: 600;
}

.profile-details {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--border-color);
  font-size: 0.9rem;
  color: var(--text-muted);
}

.detail-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.detail-row i {
  color: var(--accent);
  width: 18px;
}

.floating-badge {
  position: absolute;
  bottom: 20px;
  right: 20px;
  background: var(--bg-surface);
  padding: 8px 14px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  font-size: 0.8rem;
  font-weight: 700;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--success);
}

.floating-badge span.pulse-dot {
  width: 8px;
  height: 8px;
  background: var(--success);
  border-radius: 50%;
  animation: pulse 1.8s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

/* Overview Cards */
.overview-section {
  padding: 40px 0 80px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 32px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}

.card-icon {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: var(--accent-light);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 22px;
  transition: transform var(--transition-fast);
}

.card:hover .card-icon {
  transform: scale(1.1) rotate(4deg);
}

.card h3 {
  font-size: 1.35rem;
  margin-bottom: 12px;
}

.card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 24px;
  flex-grow: 1;
}

.card-footer-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  transition: gap var(--transition-fast);
}

.card-footer-link:hover {
  gap: 12px;
}

/* Sections Base */
section {
  padding: 90px 0;
  border-bottom: 1px solid var(--border-color);
}

/* Timeline Filter & Layout */
.timeline-filters {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 40px;
}

.filter-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 8px 18px;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.timeline {
  position: relative;
  max-width: 860px;
  margin: 0 auto;
  padding: 20px 0;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 28px;
  width: 3px;
  background: linear-gradient(180deg, var(--accent) 0%, var(--primary) 100%);
  border-radius: var(--radius-full);
}

.timeline-item {
  position: relative;
  padding-left: 70px;
  margin-bottom: 36px;
  transition: all var(--transition-normal);
}

.timeline-item.hidden {
  display: none;
}

.timeline-node {
  position: absolute;
  left: 14px;
  top: 4px;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--bg-surface);
  border: 3px solid var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  color: var(--accent);
  box-shadow: 0 0 0 4px var(--bg-body);
  transition: all var(--transition-fast);
}

.timeline-item:hover .timeline-node {
  background: var(--accent);
  color: #fff;
  transform: scale(1.15);
}

.timeline-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 24px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.timeline-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
  transform: translateX(4px);
}

.timeline-badge-group {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.year-badge {
  background: var(--accent-light);
  color: var(--accent);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
}

.timeline-item h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.timeline-item p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Learning Activities Section */
.activities-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.activity-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 30px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.activity-box:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
  transform: translateY(-4px);
}

.activity-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.activity-num {
  width: 36px;
  height: 36px;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.95rem;
  flex-shrink: 0;
}

.activity-box h3 {
  font-size: 1.2rem;
}

.activity-box p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 20px;
}

/* Timeline Images */
.timeline-img-wrapper {
  margin-top: 16px;
  border-radius: var(--radius-md);
  overflow: hidden;
  position: relative;
  border: 1px solid var(--border-color);
  background: var(--bg-muted);
  cursor: zoom-in;
}

.timeline-img-wrapper img {
  width: 100%;
  height: 340px;
  object-fit: cover;
  object-position: top center; /* Focuses directly on top, showing faces and context */
  display: block;
  transition: transform var(--transition-slow);
}

/* Portrait & High-Clearance Timeline Image Variants */
.timeline-img-wrapper.portrait-top img {
  height: 380px;
  object-fit: cover;
  object-position: top center;
}

.timeline-img-wrapper.portrait-contain {
  height: 400px;
  background: radial-gradient(circle, var(--bg-muted) 0%, rgba(0,0,0,0.06) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.timeline-img-wrapper.portrait-contain img {
  height: 100%;
  width: 100%;
  object-fit: contain;
  object-position: center;
}

.timeline-img-wrapper:hover img {
  transform: scale(1.03);
}

.img-zoom-badge {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  color: #ffffff;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  pointer-events: none;
  transition: background var(--transition-fast);
}

.timeline-img-wrapper:hover .img-zoom-badge,
.activity-img-wrapper:hover .img-zoom-badge {
  background: var(--primary);
}

/* Learning Activity Images */
.activity-img-wrapper {
  width: 100%;
  height: 190px;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 20px;
  position: relative;
  border: 1px solid var(--border-color);
  cursor: zoom-in;
}

.activity-img-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform var(--transition-slow);
}

.activity-img-wrapper:hover img {
  transform: scale(1.06);
}

.tts-btn {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-muted);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tts-btn:hover {
  background: var(--accent-light);
  color: var(--accent);
  border-color: var(--accent);
}

/* Lightbox Modal */
.lightbox-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.88);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 3000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.lightbox-backdrop.active {
  opacity: 1;
  visibility: visible;
}

.lightbox-content {
  position: relative;
  max-width: 90vw;
  max-height: 88vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  transform: scale(0.92);
  transition: transform var(--transition-normal);
}

.lightbox-backdrop.active .lightbox-content {
  transform: scale(1);
}

.lightbox-img {
  max-width: 100%;
  max-height: 75vh;
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.15);
  object-fit: contain;
}

.lightbox-caption {
  margin-top: 14px;
  color: #f8fafc;
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  max-width: 600px;
}

.lightbox-close-btn {
  position: absolute;
  top: -46px;
  right: 0;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: #ffffff;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lightbox-close-btn:hover {
  background: #ef4444;
  border-color: #ef4444;
  transform: scale(1.1);
}

/* Interactive Mini Quiz Widget */
.quiz-wrapper {
  margin-top: 50px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 36px;
  box-shadow: var(--shadow-md);
}

.quiz-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.quiz-question {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.quiz-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 20px;
}

.quiz-btn {
  background: var(--bg-muted);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 14px 18px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  text-align: left;
  transition: all var(--transition-fast);
}

.quiz-btn:hover:not(:disabled) {
  background: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent);
}

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

.quiz-btn.wrong {
  background: #fef2f2 !important;
  border-color: #ef4444 !important;
  color: #ef4444 !important;
}

.quiz-feedback {
  min-height: 24px;
  font-weight: 600;
  font-size: 0.95rem;
}

/* Critical Thinking Section */
.critical-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  margin-bottom: 40px;
}

.concept-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 30px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.concept-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--accent-light);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 16px;
}

.benefits-title {
  margin-top: 20px;
  margin-bottom: 10px;
  font-size: 1rem;
  color: var(--text-main);
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.benefits-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.benefits-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.925rem;
  color: var(--text-muted);
}

.benefits-list li i {
  color: var(--success);
  font-size: 0.85rem;
}

/* Present and Future Goals Card */
.goals-card {
  margin-top: 60px;
  background: linear-gradient(135deg, var(--bg-surface), var(--bg-muted));
  border: 1px solid var(--border-color);
  border-left: 6px solid var(--accent);
  border-radius: var(--radius-xl);
  padding: 36px;
  box-shadow: var(--shadow-md);
}

.goals-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}

.goals-header h3 {
  font-size: 1.35rem;
}

.goals-card p {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 14px;
}

.goals-card p:last-child {
  margin-bottom: 0;
}

.reflection-card {
  background: linear-gradient(135deg, rgba(30, 58, 138, 0.05), rgba(2, 132, 199, 0.08));
  border: 1px solid var(--border-color);
  border-left: 6px solid var(--accent);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 40px;
}

.reflection-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.reflection-header h3 {
  font-size: 1.3rem;
}

/* Fact Checking Interactive Checklist */
.checklist-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 30px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.checklist-title {
  font-size: 1.15rem;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.checklist-items {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.check-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 16px;
  background: var(--bg-muted);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.check-item:hover {
  background: var(--accent-light);
}

.check-item input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
  cursor: pointer;
}

.check-item.checked {
  text-decoration: line-through;
  opacity: 0.75;
}

/* Search Modal Overlay */
.search-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  z-index: 1200;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 80px 20px 20px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.search-modal-backdrop.active {
  opacity: 1;
  visibility: visible;
}

.search-modal {
  background: var(--bg-surface);
  width: 100%;
  max-width: 640px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  transform: translateY(-20px) scale(0.98);
  transition: all var(--transition-normal);
}

.search-modal-backdrop.active .search-modal {
  transform: translateY(0) scale(1);
}

.search-input-wrapper {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 24px;
  border-bottom: 1px solid var(--border-color);
}

.search-input-wrapper i {
  color: var(--accent);
  font-size: 1.2rem;
}

.search-input-wrapper input {
  flex-grow: 1;
  background: transparent;
  border: none;
  font-size: 1.1rem;
  color: var(--text-main);
  outline: none;
  font-family: inherit;
}

.search-input-wrapper input::placeholder {
  color: var(--text-muted);
}

.search-close-btn {
  background: var(--bg-muted);
  border: none;
  color: var(--text-muted);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 0.85rem;
}

.search-results {
  max-height: 380px;
  overflow-y: auto;
  padding: 16px 20px;
}

.search-result-item {
  padding: 14px 16px;
  border-radius: var(--radius-md);
  margin-bottom: 8px;
  cursor: pointer;
  transition: background var(--transition-fast);
  text-decoration: none;
  display: block;
}

.search-result-item:hover {
  background: var(--bg-muted);
}

.search-result-item h4 {
  font-size: 1rem;
  color: var(--accent);
  margin-bottom: 4px;
}

.search-result-item p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.search-no-results {
  text-align: center;
  padding: 30px 20px;
  color: var(--text-muted);
}

.search-footer {
  padding: 12px 24px;
  background: var(--bg-muted);
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Highlight Flash Animation for Search targets */
.highlight-flash {
  animation: flashGlow 2.5s ease;
}

@keyframes flashGlow {
  0% { background-color: var(--accent-light); box-shadow: 0 0 0 4px var(--accent); }
  100% { background-color: transparent; }
}

/* Footer */
footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 50px 0 30px;
  color: var(--text-muted);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 30px;
}

.footer-author {
  font-weight: 700;
  color: var(--text-main);
}

.footer-links {
  display: flex;
  gap: 20px;
  list-style: none;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  text-align: center;
  font-size: 0.85rem;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
}

/* Floating Action Button (Back to top) */
.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--primary);
  color: #fff;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all var(--transition-normal);
  z-index: 990;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--accent);
  transform: translateY(-3px);
}

/* Toast Notification */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(40px);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 12px 22px;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-xl);
  font-size: 0.9rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 10px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: 2000;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
  visibility: visible;
}

/* Responsive Media Queries */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-content {
    max-width: 100%;
    text-align: center;
  }
  
  .hero-actions {
    justify-content: center;
  }
  
  .hero-stats {
    justify-content: center;
  }
  
  .critical-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .mobile-toggle {
    display: flex;
  }
  
  .search-trigger-btn span,
  .search-trigger-btn kbd {
    display: none;
  }
  
  .search-trigger-btn {
    padding: 8px;
    width: 40px;
    height: 40px;
    justify-content: center;
  }
  
  .hero h1 {
    font-size: 2.3rem;
  }
  
  .quiz-options {
    grid-template-columns: 1fr;
  }
  
  .timeline::before {
    left: 20px;
  }
  
  .timeline-node {
    left: 6px;
  }
  
  .timeline-item {
    padding-left: 50px;
  }
  
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}