/* ============================================================
   TINCOVERSE - EDU THEME | Môn Tin học
   Premium Educational Design System
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,400&family=JetBrains+Mono:wght@400;500;700&display=swap');

/* ─── CSS VARIABLES — DARK MODE (default) ─── */
:root {
  --primary: #6C3CE1;
  --primary-light: #8B5CF6;
  --primary-dark: #4C1D95;
  --accent: #06B6D4;
  --accent-2: #F59E0B;
  --accent-3: #10B981;
  --danger: #EF4444;

  /* Dark theme surfaces */
  --bg-dark: #0A0B1A;
  --bg-card: #0F1030;
  --bg-glass: rgba(108, 60, 225, 0.08);
  --border-glass: rgba(139, 92, 246, 0.2);

  /* Dark theme text */
  --text-primary: #F0F0FF;
  --text-secondary: #A0A8CC;
  --text-muted: #6B7280;

  --gradient-hero: linear-gradient(135deg, #0A0B1A 0%, #1A0545 50%, #0A1A3A 100%);
  --gradient-card: linear-gradient(135deg, rgba(108,60,225,0.15), rgba(6,182,212,0.08));
  --gradient-primary: linear-gradient(135deg, #6C3CE1, #06B6D4);
  --gradient-accent: linear-gradient(135deg, #F59E0B, #EF4444);

  --shadow-glow: 0 0 40px rgba(108, 60, 225, 0.4);
  --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
  --shadow-btn: 0 4px 20px rgba(108, 60, 225, 0.5);

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 40px;

  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);

  /* Theme toggle icon */
  --theme-icon: '\f186'; /* moon */
  --particle-opacity: 0.4;
}

/* ─── LIGHT MODE VARIABLES ─── */
[data-theme="light"] {
  --bg-dark: #F0F2FF;
  --bg-card: #FFFFFF;
  --bg-glass: rgba(108, 60, 225, 0.06);
  --border-glass: rgba(108, 60, 225, 0.18);

  --text-primary: #1A1035;
  --text-secondary: #4A4870;
  --text-muted: #8B85A8;

  --gradient-hero: linear-gradient(135deg, #EEF0FF 0%, #E8DEFF 50%, #DFF5FF 100%);
  --gradient-card: linear-gradient(135deg, rgba(108,60,225,0.07), rgba(6,182,212,0.04));

  --shadow-glow: 0 0 40px rgba(108, 60, 225, 0.18);
  --shadow-card: 0 8px 32px rgba(108,60,225,0.1);
  --shadow-btn: 0 4px 20px rgba(108, 60, 225, 0.35);

  --particle-opacity: 0.15;
  --theme-icon: '\f185'; /* sun */
}

/* ─── GLOBAL SMOOTH TRANSITION ─── */
*, *::before, *::after {
  transition:
    background-color 0.4s cubic-bezier(0.4, 0, 0.2, 1),
    background 0.4s cubic-bezier(0.4, 0, 0.2, 1),
    color 0.4s cubic-bezier(0.4, 0, 0.2, 1),
    border-color 0.4s cubic-bezier(0.4, 0, 0.2, 1),
    box-shadow 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Pause color transitions on keyframe-animated elements */
@keyframes float-glow { 0%,100%{transform:translate(0,0) scale(1)} 33%{transform:translate(30px,-20px) scale(1.05)} 66%{transform:translate(-20px,30px) scale(0.95)} }
@keyframes float-card { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-12px)} }
@keyframes marquee-scroll { from{transform:translateX(0)} to{transform:translateX(-50%)} }
@keyframes pulse-dot { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:.5;transform:scale(.7)} }
@keyframes timer-pulse { from{opacity:1} to{opacity:.7} }
@keyframes shimmer { from{opacity:0} to{opacity:1} }

.hero-glow-1, .hero-glow-2, .float-card,
.marquee-track, .badge .dot,
.progress-bar-fill::after, .timer-badge {
  transition: none !important;
}

/* html smooth color-scheme transition */
html {
  transition: background-color 0.4s cubic-bezier(0.4,0,0.2,1);
}


/* ─── RESET & BASE ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: 'Be Vietnam Pro', sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  overflow-x: hidden;
  line-height: 1.6;
  color-scheme: dark;
}

[data-theme="light"] body, body[data-theme="light"] {
  color-scheme: light;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* ─── SCROLLBAR ─── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-dark); transition: background 0.4s; }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }

/* ─── PARTICLE CANVAS ─── */
#particle-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: var(--particle-opacity, 0.4);
  transition: opacity 0.6s ease;
}

/* ─── THEME TOGGLE BUTTON ─── */
#theme-toggle {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-glass);
  border: 1.5px solid var(--border-glass);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1rem;
  flex-shrink: 0;
  position: relative;
  overflow: hidden;
  transition: var(--transition) !important;
}

#theme-toggle:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  transform: rotate(20deg) scale(1.1);
  box-shadow: var(--shadow-btn);
}

#theme-toggle .toggle-icon {
  position: absolute;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s ease;
}

#theme-toggle .icon-sun  { opacity: 0; transform: rotate(-90deg) scale(0.5); }
#theme-toggle .icon-moon { opacity: 1; transform: rotate(0deg) scale(1); }

[data-theme="light"] #theme-toggle .icon-sun  { opacity: 1; transform: rotate(0deg) scale(1); }
[data-theme="light"] #theme-toggle .icon-moon { opacity: 0; transform: rotate(90deg) scale(0.5); }

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

.section { padding: 100px 0; position: relative; z-index: 1; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: 50px;
  padding: 6px 16px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary-light);
  letter-spacing: 0.05em;
  backdrop-filter: blur(10px);
}

.badge .dot {
  width: 8px; height: 8px;
  background: var(--accent-3);
  border-radius: 50%;
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.7); }
}

.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 12px;
  position: relative;
  padding-left: 20px;
}

.section-tag::before {
  content: '';
  position: absolute;
  left: 0; top: 50%;
  transform: translateY(-50%);
  width: 12px; height: 2px;
  background: var(--accent);
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.7;
}

/* ─── NAVBAR ─── */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 0 24px;
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(10, 11, 26, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-glass);
  box-shadow: 0 4px 30px rgba(0,0,0,0.3);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 32px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-primary);
}

.nav-logo .logo-icon {
  width: 38px; height: 38px;
  background: var(--gradient-primary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: var(--shadow-btn);
}

.nav-logo span { color: var(--primary-light); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
  position: relative;
  white-space: nowrap;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 9px; left: 50%;
  transform: translateX(-50%) scaleX(0);
  transform-origin: center;
  width: 60%; height: 2px;
  background: var(--gradient-primary);
  transition: transform 0.25s ease;
  border-radius: 2px;
}

.nav-links a:hover { color: var(--text-primary); background: var(--bg-glass); }
.nav-links a.active { color: var(--primary-light); }
.nav-links a.active::after { transform: translateX(-50%) scaleX(1); }

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

.landing-guest-actions, .landing-user-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.landing-guest-actions[hidden], .landing-user-actions[hidden] {
  display: none !important;
}

.landing-user-name {
  max-width: 190px;
  overflow: hidden;
  color: var(--text-primary);
  font-size: .9rem;
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.landing-logout { justify-content: center; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  font-family: 'Be Vietnam Pro', sans-serif;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-outline {
  background: transparent;
  border: 1.5px solid var(--border-glass);
  color: var(--text-primary);
}

.btn-outline:hover {
  border-color: var(--primary-light);
  color: var(--primary-light);
  background: var(--bg-glass);
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: var(--shadow-btn);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 30px rgba(108, 60, 225, 0.7);
}

.btn-lg { padding: 14px 32px; font-size: 1rem; border-radius: var(--radius-md); }

.btn-accent {
  background: linear-gradient(135deg, var(--accent-2), #F97316);
  color: #fff;
  box-shadow: 0 4px 20px rgba(245, 158, 11, 0.4);
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(245, 158, 11, 0.6);
}

/* ─── HAMBURGER ─── */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none; border: none;
}

.hamburger span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ─── HERO SECTION ─── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
  z-index: 0;
}

.hero-glow-1 {
  position: absolute;
  width: 600px; height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(108,60,225,0.3) 0%, transparent 70%);
  top: -100px; left: -100px;
  animation: float-glow 8s ease-in-out infinite;
}

.hero-glow-2 {
  position: absolute;
  width: 400px; height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(6,182,212,0.2) 0%, transparent 70%);
  bottom: -50px; right: 10%;
  animation: float-glow 10s ease-in-out infinite reverse;
}

@keyframes float-glow {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -20px) scale(1.05); }
  66% { transform: translate(-20px, 30px) scale(0.95); }
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 60px;
}

.hero-content { }

.hero-badge { margin-bottom: 28px; }

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 24px;
}

.hero-title .line-1 { display: block; color: var(--text-primary); }

.hero-title .line-2 {
  display: block;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-title .line-3 {
  display: block;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 36px;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero-stats {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}

.stat-item { }

.stat-num {
  font-size: 1.8rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ─── HERO VISUAL ─── */
.hero-visual {
  position: relative;
}

.hero-img-wrap {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-glow), var(--shadow-card);
  border: 1px solid var(--border-glass);
}

.hero-img-wrap img {
  width: 100%;
  height: 380px;
  object-fit: cover;
  display: block;
}

.hero-img-wrap::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(10,11,26,0.6) 0%, transparent 60%);
}

/* Floating Cards on Hero */
.float-card {
  position: absolute;
  background: rgba(15, 16, 48, 0.85);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  box-shadow: var(--shadow-card);
  z-index: 2;
  animation: float-card 6s ease-in-out infinite;
}

.float-card-1 { top: -20px; right: -20px; animation-delay: 0s; }
.float-card-2 { bottom: 30px; left: -30px; animation-delay: 2s; }
.float-card-3 { top: 50%; right: -40px; animation-delay: 4s; }

@keyframes float-card {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.float-card .fc-icon {
  width: 36px; height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.fc-icon.purple { background: rgba(108,60,225,0.2); }
.fc-icon.cyan { background: rgba(6,182,212,0.2); }
.fc-icon.amber { background: rgba(245,158,11,0.2); }

.float-card .fc-text { font-size: 0.78rem; }
.float-card .fc-text strong { display: block; font-weight: 700; color: var(--text-primary); font-size: 0.85rem; }
.float-card .fc-text span { color: var(--text-muted); }

/* ─── MARQUEE STRIP ─── */
.marquee-section {
  padding: 24px 0;
  background: linear-gradient(90deg, var(--bg-dark), rgba(108,60,225,0.1), var(--bg-dark));
  border-top: 1px solid var(--border-glass);
  border-bottom: 1px solid var(--border-glass);
  overflow: hidden;
  position: relative;
  z-index: 1;
}

.marquee-track {
  display: flex;
  gap: 48px;
  animation: marquee-scroll 30s linear infinite;
  width: max-content;
}

.marquee-group {
  display: flex;
  align-items: center;
  gap: 48px;
}

.marquee-track:hover { animation-play-state: paused; }
.marquee-empty {
  width: 100%;
  justify-content: center;
  animation: none;
}

@keyframes marquee-scroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

.marquee-item {
  display: flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
}

.marquee-item .mi-icon {
  font-size: 1.2rem;
}

.marquee-divider {
  color: var(--border-glass);
  font-size: 1.2rem;
}

/* ─── FEATURES SECTION ─── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 60px;
}

.feature-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.feature-card[href] {
  color: inherit;
  text-decoration: none;
}

.feature-card[hidden], .curriculum-item[hidden], section[hidden] {
  display: none !important;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: var(--transition);
}

.feature-card:hover::before { transform: scaleX(1); }

.feature-card:hover {
  transform: translateY(-6px);
  border-color: rgba(139, 92, 246, 0.4);
  box-shadow: var(--shadow-glow);
  background: rgba(108,60,225,0.12);
}

.feature-card .fc-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--primary-light);
  font-weight: 700;
  margin-bottom: 16px;
  opacity: 0.6;
}

.feature-icon {
  width: 56px; height: 56px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
  position: relative;
}

.feature-icon.ic-purple { background: rgba(108,60,225,0.2); border: 1px solid rgba(108,60,225,0.3); color: #A78BFA; }
.feature-icon.ic-cyan { background: rgba(6,182,212,0.15); border: 1px solid rgba(6,182,212,0.3); color: #22D3EE; }
.feature-icon.ic-amber { background: rgba(245,158,11,0.15); border: 1px solid rgba(245,158,11,0.3); color: #FCD34D; }
.feature-icon.ic-green { background: rgba(16,185,129,0.15); border: 1px solid rgba(16,185,129,0.3); color: #34D399; }
.feature-icon.ic-pink { background: rgba(236,72,153,0.15); border: 1px solid rgba(236,72,153,0.3); color: #F472B6; }
.feature-icon.ic-red { background: rgba(239,68,68,0.15); border: 1px solid rgba(239,68,68,0.3); color: #F87171; }

/* Font Awesome icon sizing */
.feature-icon i { font-size: 1.4rem; }
.feature-arrow i { font-size: 0.85rem; }
.logo-icon i { font-size: 1.1rem; color: #fff; }
.social-btn i { font-size: 0.95rem; }
.mi-icon i { font-size: 1rem; color: var(--primary-light); }
.fc-icon i { font-size: 1rem; }
.fc-icon.purple i { color: #A78BFA; }
.fc-icon.cyan i { color: #22D3EE; }
.fc-icon.amber i { color: #FCD34D; }
.ei-item i { color: var(--primary-light); margin-right: 4px; }
.teacher-role i { color: var(--primary-light); margin-right: 6px; }
.teacher-badge-float i { color: #FCD34D; margin-right: 4px; }
.sidebar-card h4 i { color: var(--primary-light); margin-right: 6px; }
.copy-btn i { font-size: 0.8rem; }
.ob-label i { color: var(--accent-3); margin-right: 4px; }
.tc-stars i { color: #F59E0B; font-size: 0.85rem; letter-spacing: 2px; }
.cta-box h2 i { font-size: clamp(1.4rem, 3vw, 2.2rem); color: var(--accent-2); }
.footer-bottom i.fa-heart { vertical-align: middle; }
.footer-col ul li a i { width: 16px; color: var(--primary-light); margin-right: 6px; }
.btn i { font-size: 0.9em; }
.mobile-menu a i { width: 20px; color: var(--primary-light); margin-right: 8px; }

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.feature-arrow {
  position: absolute;
  bottom: 24px; right: 24px;
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  color: var(--primary-light);
  transition: var(--transition);
}

.feature-card:hover .feature-arrow {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  transform: translateX(4px);
}

/* ─── CURRICULUM SECTION ─── */
.curriculum-section {
  background: linear-gradient(180deg, transparent, rgba(108,60,225,0.05), transparent);
}

.curriculum-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-top: 60px;
  align-items: start;
}

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

.curriculum-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: var(--gradient-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 20px;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}

.curriculum-item:hover, .curriculum-item.active {
  border-color: rgba(139, 92, 246, 0.5);
  background: rgba(108,60,225,0.15);
  transform: translateX(6px);
}

.ci-num {
  min-width: 40px; height: 40px;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--primary-light);
}

.curriculum-item.active .ci-num {
  background: var(--gradient-primary);
  border-color: transparent;
  color: #fff;
}

.ci-content h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--text-primary);
}

.ci-content p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.ci-badge {
  position: absolute;
  top: 20px; right: 20px;
  background: rgba(16,185,129,0.15);
  border: 1px solid rgba(16,185,129,0.3);
  color: var(--accent-3);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 50px;
}

/* Preview Panel */
.curriculum-preview {
  position: sticky;
  top: 100px;
}

.preview-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.preview-header {
  padding: 16px 20px;
  background: rgba(108,60,225,0.1);
  border-bottom: 1px solid var(--border-glass);
  display: flex;
  align-items: center;
  gap: 8px;
}

.preview-dots { display: flex; gap: 6px; }
.preview-dots span {
  width: 10px; height: 10px;
  border-radius: 50%;
}

.pd-red { background: #EF4444; }
.pd-yellow { background: #F59E0B; }
.pd-green { background: #10B981; }

.preview-title {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
  flex: 1;
  text-align: center;
}

.preview-body { padding: 24px; }

.code-block {
  background: rgba(0,0,0,0.3);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: var(--radius-sm);
  padding: 16px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  line-height: 1.8;
  overflow-x: auto;
  margin-bottom: 16px;
}

.code-block .c-keyword { color: #C084FC; }
.code-block .c-func { color: #38BDF8; }
.code-block .c-string { color: #86EFAC; }
.code-block .c-number { color: #FCD34D; }
.code-block .c-comment { color: #6B7280; font-style: italic; }

.output-block {
  background: rgba(16,185,129,0.05);
  border: 1px solid rgba(16,185,129,0.2);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--accent-3);
}

.output-block .ob-label {
  color: var(--text-muted);
  margin-bottom: 6px;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* ─── TEACHER SECTION ─── */
.teacher-section {
  padding: 100px 0;
}

.teacher-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  padding: 60px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.teacher-card::before {
  content: '';
  position: absolute;
  top: -100px; right: -100px;
  width: 400px; height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(108,60,225,0.2), transparent 70%);
}

.teacher-avatar-wrap {
  position: relative;
  width: 200px;
}

.teacher-avatar-wrap img {
  width: 200px; height: 200px;
  border-radius: var(--radius-lg);
  object-fit: cover;
  border: 3px solid var(--border-glass);
  box-shadow: var(--shadow-glow);
}

.teacher-badge-float {
  position: absolute;
  bottom: -12px; left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-primary);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 50px;
  white-space: nowrap;
  box-shadow: var(--shadow-btn);
}

.teacher-info h2 {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 4px;
}

.teacher-info .teacher-role {
  color: var(--primary-light);
  font-weight: 600;
  margin-bottom: 16px;
  font-size: 0.95rem;
}

.teacher-info p {
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 0.95rem;
  max-width: 600px;
  margin-bottom: 24px;
}

.teacher-stats {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

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

.ts-num {
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.ts-label {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.teacher-socials {
  display: flex;
  gap: 12px;
}

.social-btn {
  width: 40px; height: 40px;
  border-radius: 10px;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--text-secondary);
  transition: var(--transition);
  cursor: pointer;
}

.social-btn:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  transform: translateY(-3px);
}

/* ─── EXAM PREVIEW / AZOTA STYLE ─── */
.exam-section {
  background: linear-gradient(180deg, transparent, rgba(6,182,212,0.04), transparent);
}

.exam-preview-wrap {
  margin-top: 60px;
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 32px;
  align-items: start;
}

.exam-window {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.exam-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: rgba(108,60,225,0.1);
  border-bottom: 1px solid var(--border-glass);
}

.exam-topbar-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.exam-topbar-left h3 {
  font-size: 0.95rem;
  font-weight: 700;
}

.exam-subject-tag {
  background: rgba(108,60,225,0.2);
  border: 1px solid rgba(108,60,225,0.3);
  color: var(--primary-light);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 50px;
}

.timer-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(239,68,68,0.1);
  border: 1px solid rgba(239,68,68,0.3);
  color: #F87171;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  animation: timer-pulse 1s ease-in-out infinite alternate;
}

@keyframes timer-pulse {
  from { opacity: 1; }
  to { opacity: 0.7; }
}

.exam-body { padding: 24px; }

.exam-info-row {
  display: flex;
  gap: 24px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-glass);
  flex-wrap: wrap;
}

.ei-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.ei-item strong { color: var(--text-primary); }

.question-list { display: flex; flex-direction: column; gap: 20px; }

.question-item {
  background: rgba(255,255,255,0.02);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: var(--transition);
}

.question-item:hover {
  border-color: var(--border-glass);
  background: rgba(108,60,225,0.05);
}

.q-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 16px;
  gap: 12px;
}

.q-num {
  min-width: 30px; height: 30px;
  background: var(--gradient-primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  color: #fff;
}

.q-text {
  flex: 1;
  font-size: 0.9rem;
  color: var(--text-primary);
  line-height: 1.6;
  font-weight: 500;
}

.q-score {
  font-size: 0.75rem;
  color: var(--accent-3);
  font-weight: 700;
  white-space: nowrap;
}

.q-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.q-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1.5px solid rgba(255,255,255,0.07);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.q-option:hover {
  border-color: var(--primary-light);
  background: rgba(108,60,225,0.08);
  color: var(--text-primary);
}

.q-option.selected {
  border-color: var(--primary-light);
  background: rgba(108,60,225,0.15);
  color: var(--primary-light);
}

.q-option.correct {
  border-color: var(--accent-3);
  background: rgba(16,185,129,0.1);
  color: var(--accent-3);
}

.opt-radio {
  width: 18px; height: 18px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: var(--transition);
}

.q-option.selected .opt-radio {
  border-color: var(--primary-light);
  background: var(--primary-light);
}

.opt-radio::after {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #fff;
  display: none;
}

.q-option.selected .opt-radio::after { display: block; }

/* Exam Sidebar */
.exam-sidebar { display: flex; flex-direction: column; gap: 20px; }

.sidebar-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.sidebar-card h4 {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.progress-bar-wrap {
  background: rgba(255,255,255,0.06);
  border-radius: 50px;
  height: 8px;
  margin-bottom: 8px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: 50px;
  width: 40%;
  transition: width 1s ease;
  position: relative;
}

.progress-bar-fill::after {
  content: '';
  position: absolute;
  right: 0; top: 0; bottom: 0;
  width: 20px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4));
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  from { opacity: 0; }
  to { opacity: 1; }
}

.progress-text {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.q-nav-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  margin-top: 16px;
}

.qn-btn {
  width: 100%;
  aspect-ratio: 1;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  border: 1.5px solid rgba(255,255,255,0.1);
  background: transparent;
  color: var(--text-secondary);
  font-family: 'Be Vietnam Pro', sans-serif;
  transition: var(--transition);
}

.qn-btn:hover { border-color: var(--primary-light); color: var(--primary-light); }
.qn-btn.answered { background: rgba(108,60,225,0.2); border-color: var(--primary-light); color: var(--primary-light); }
.qn-btn.current { background: var(--gradient-primary); border-color: transparent; color: #fff; }
.qn-btn.correct { background: rgba(16,185,129,0.2); border-color: var(--accent-3); color: var(--accent-3); }

.legend { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 12px; }

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.72rem;
  color: var(--text-muted);
}

.legend-dot {
  width: 10px; height: 10px;
  border-radius: 3px;
}

.ld-current { background: var(--primary); }
.ld-answered { background: rgba(108,60,225,0.4); border: 1px solid var(--primary-light); }
.ld-unanswered { background: transparent; border: 1px solid rgba(255,255,255,0.2); }

/* ─── TESTIMONIALS ─── */
.testimonials-section { padding: 100px 0; }

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 60px;
}

.testimonial-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition);
}

.testimonial-card:hover {
  transform: translateY(-6px);
  border-color: rgba(139,92,246,0.4);
  box-shadow: var(--shadow-glow);
}

.tc-stars {
  color: var(--accent-2);
  font-size: 0.9rem;
  margin-bottom: 16px;
  letter-spacing: 2px;
}

.tc-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 20px;
  font-style: italic;
}

.tc-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.tc-avatar {
  width: 42px; height: 42px;
  border-radius: 50%;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
}

.av-purple { background: linear-gradient(135deg, #6C3CE1, #8B5CF6); }
.av-cyan { background: linear-gradient(135deg, #06B6D4, #0284C7); }
.av-amber { background: linear-gradient(135deg, #F59E0B, #EF4444); }

.tc-author-info strong { font-size: 0.9rem; display: block; }
.tc-author-info span { font-size: 0.78rem; color: var(--text-muted); }

/* ─── CTA SECTION ─── */
.cta-section {
  padding: 80px 0;
  position: relative;
}

.cta-box {
  background: linear-gradient(135deg, rgba(108,60,225,0.2), rgba(6,182,212,0.1));
  border: 1px solid rgba(108,60,225,0.4);
  border-radius: var(--radius-xl);
  padding: 80px 60px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-box::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(108,60,225,0.3), transparent 70%);
}

.cta-box h2 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 900;
  margin-bottom: 16px;
  position: relative;
  background: linear-gradient(135deg, var(--text-primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.cta-box p {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 36px;
  position: relative;
}

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

/* ─── FOOTER ─── */
footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border-glass);
  padding: 60px 0 30px;
  position: relative;
  z-index: 1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand { }

.footer-brand .nav-logo { margin-bottom: 16px; }

.footer-brand p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 280px;
  margin-bottom: 20px;
}

.footer-socials { display: flex; gap: 10px; }

.footer-col h5 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

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

.footer-col ul li a {
  font-size: 0.88rem;
  color: var(--text-muted);
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.footer-col ul li a:hover { color: var(--primary-light); padding-left: 4px; }

.footer-bottom {
  border-top: 1px solid var(--border-glass);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.footer-bottom span { color: var(--primary-light); }

/* ─── ANIMATIONS ─── */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.animate-on-scroll.animated {
  opacity: 1;
  transform: translateY(0);
}

.landing-page .hero-visual.animate-on-scroll {
  transform: translateY(24px) scale(.96);
  transition: opacity .9s cubic-bezier(.2,.75,.25,1), transform .9s cubic-bezier(.2,.75,.25,1);
}

.landing-page .hero-visual.animate-on-scroll.animated {
  transform: translateY(0) scale(1);
}

.landing-page .hero-badge.animate-on-scroll,
.landing-page .hero-title.animate-on-scroll,
.landing-page .hero-desc.animate-on-scroll,
.landing-page .hero-actions.animate-on-scroll {
  transition: opacity .75s ease, transform .75s cubic-bezier(.2,.75,.25,1);
}

.landing-page .feature-card.animate-on-scroll,
.landing-page .curriculum-item.animate-on-scroll {
  transition: opacity .65s ease, transform .65s cubic-bezier(.2,.75,.25,1), background-color .3s ease, border-color .3s ease, box-shadow .3s ease;
}

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }
.delay-5 { transition-delay: 0.5s; }

.landing-page .feature-card:hover .feature-icon,
.landing-page .feature-card:focus-visible .feature-icon {
  transform: translateY(-4px) rotate(-5deg) scale(1.06);
}

.landing-page .feature-icon {
  transition: transform .3s cubic-bezier(.2,.75,.25,1);
}

.landing-page .hero-actions .btn:hover,
.landing-page .landing-user-actions .btn:hover,
.landing-page .landing-guest-actions .btn:hover {
  transform: translateY(-3px);
}

.landing-page .nav-logo .logo-icon {
  transition: transform .35s cubic-bezier(.2,.75,.25,1), box-shadow .35s ease;
}

.landing-page .nav-logo:hover .logo-icon {
  transform: rotate(-8deg) scale(1.08);
  box-shadow: 0 8px 28px rgba(108,60,225,.35);
}

@media (prefers-reduced-motion: reduce) {
  .landing-page .animate-on-scroll,
  .landing-page .hero-visual.animate-on-scroll,
  .landing-page .feature-card.animate-on-scroll,
  .landing-page .curriculum-item.animate-on-scroll {
    transition: none;
    transform: none;
  }

  .landing-page .hero-glow-1,
  .landing-page .hero-glow-2,
  .landing-page .marquee-track {
    animation: none;
  }
}

/* ─── MOBILE NAV ─── */
.mobile-menu {
  position: fixed;
  top: 72px; left: 0; right: 0;
  background: rgba(10,11,26,0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-glass);
  padding: 24px;
  display: none;
  flex-direction: column;
  gap: 8px;
  z-index: 999;
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition), visibility 0s linear 0.3s;
  pointer-events: none;
}

.mobile-menu.open {
  visibility: visible;
  transform: translateY(0);
  opacity: 1;
  transition: var(--transition), visibility 0s;
  pointer-events: all;
}

.mobile-menu a {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: var(--transition);
}

.mobile-menu a:hover, .mobile-menu a.active {
  color: var(--primary-light);
  background: var(--bg-glass);
}

.mobile-auth-btns {
  display: flex;
  gap: 10px;
}

.mobile-auth-btns .landing-guest-actions,
.mobile-auth-btns .landing-user-actions {
  width: 100%;
}

.mobile-auth-btns .landing-user-name { flex: 1; }

/* ─── RESPONSIVE ─── */
@media (max-width: 1280px) {
  .navbar { padding: 0 20px; }
  .nav-inner { gap: 12px; }
  .nav-logo { font-size: 1.15rem; }
  .nav-links a { padding: 8px 9px; font-size: 0.84rem; }
  .nav-actions { gap: 8px; }
  .nav-actions .btn { padding: 9px 12px; }
}

@media (max-width: 1100px) {
  .nav-links, .nav-actions { display: none; }
  .hamburger { display: flex; }
  .mobile-menu { display: flex; }
}

@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .exam-preview-wrap { grid-template-columns: 1fr; }
  .exam-sidebar { display: grid; grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-links, .nav-actions { display: none; }
  .hamburger { display: flex; }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-visual { order: -1; }

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

  .curriculum-grid { grid-template-columns: 1fr; }
  .curriculum-preview { display: none; }

  .teacher-card {
    grid-template-columns: 1fr;
    padding: 40px 24px;
    text-align: center;
  }

  .teacher-avatar-wrap { margin: 0 auto; }
  .teacher-stats { justify-content: center; }
  .teacher-socials { justify-content: center; }

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

  .cta-box { padding: 48px 24px; }

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

  .exam-sidebar { grid-template-columns: 1fr; }

  .q-options { grid-template-columns: 1fr; }

  .float-card-2, .float-card-3 { display: none; }
}


@media (max-width: 480px) {
  .hero-stats { gap: 20px; }
  .footer-grid { grid-template-columns: 1fr; }
}

/* ════════════════════════════════════════════════════
   LIGHT MODE COMPONENT OVERRIDES
   ════════════════════════════════════════════════════ */

/* Restore transform transitions overridden by global color transition */
.float-card, .feature-card, .curriculum-item,
.testimonial-card, .btn, .social-btn, .qn-btn,
#theme-toggle {
  transition:
    background-color 0.4s cubic-bezier(0.4,0,0.2,1),
    background 0.4s cubic-bezier(0.4,0,0.2,1),
    color 0.4s cubic-bezier(0.4,0,0.2,1),
    border-color 0.4s cubic-bezier(0.4,0,0.2,1),
    box-shadow 0.4s cubic-bezier(0.4,0,0.2,1),
    transform 0.3s cubic-bezier(0.4,0,0.2,1),
    opacity 0.3s ease !important;
}

/* ── Navbar ── */
[data-theme="light"] .navbar.scrolled {
  background: rgba(240,242,255,0.9);
  border-bottom-color: rgba(108,60,225,0.15);
  box-shadow: 0 4px 24px rgba(108,60,225,0.08);
}
[data-theme="light"] .nav-links a { color: var(--text-secondary); }
[data-theme="light"] .nav-links a:hover { background: rgba(108,60,225,0.07); color: var(--primary); }
[data-theme="light"] .btn-outline { border-color: rgba(108,60,225,0.3); color: var(--primary); }
[data-theme="light"] .btn-outline:hover { background: rgba(108,60,225,0.08); }
[data-theme="light"] .hamburger span { background: var(--text-primary); }

/* ── Mobile Menu ── */
[data-theme="light"] .mobile-menu {
  background: rgba(240,242,255,0.97);
  border-bottom-color: rgba(108,60,225,0.15);
}
[data-theme="light"] .mobile-menu a { color: var(--text-secondary); }
[data-theme="light"] .mobile-menu a:hover,
[data-theme="light"] .mobile-menu a.active { color: var(--primary); background: rgba(108,60,225,0.07); }

/* ── Hero ── */
[data-theme="light"] .hero::before { background: var(--gradient-hero); }
[data-theme="light"] .hero-glow-1 {
  background: radial-gradient(circle, rgba(108,60,225,0.12) 0%, transparent 70%);
}
[data-theme="light"] .hero-glow-2 {
  background: radial-gradient(circle, rgba(6,182,212,0.1) 0%, transparent 70%);
}
[data-theme="light"] .badge {
  background: rgba(108,60,225,0.08);
  border-color: rgba(108,60,225,0.2);
}
[data-theme="light"] .float-card {
  background: rgba(255,255,255,0.95);
  border-color: rgba(108,60,225,0.18);
  box-shadow: 0 8px 32px rgba(108,60,225,0.12);
}

/* ── Marquee ── */
[data-theme="light"] .marquee-section {
  background: linear-gradient(90deg, var(--bg-dark), rgba(108,60,225,0.05), var(--bg-dark));
  border-color: rgba(108,60,225,0.1);
}
[data-theme="light"] .marquee-item { color: var(--text-secondary); }

/* ── Feature Cards ── */
[data-theme="light"] .feature-card {
  background: #FFFFFF;
  border-color: rgba(108,60,225,0.12);
  box-shadow: 0 2px 16px rgba(108,60,225,0.06);
}
[data-theme="light"] .feature-card:hover {
  background: #F8F5FF;
  border-color: rgba(108,60,225,0.3);
  box-shadow: 0 8px 32px rgba(108,60,225,0.15);
}
[data-theme="light"] .feature-card h3 { color: var(--text-primary); }
[data-theme="light"] .feature-card p { color: var(--text-secondary); }
[data-theme="light"] .feature-arrow {
  background: rgba(108,60,225,0.06);
  border-color: rgba(108,60,225,0.15);
}

/* ── Curriculum ── */
[data-theme="light"] .curriculum-item {
  background: #FFFFFF;
  border-color: rgba(108,60,225,0.12);
}
[data-theme="light"] .curriculum-item:hover,
[data-theme="light"] .curriculum-item.active {
  background: #F4EEFF;
  border-color: rgba(108,60,225,0.35);
}
[data-theme="light"] .ci-num {
  background: rgba(108,60,225,0.07);
  border-color: rgba(108,60,225,0.15);
}
[data-theme="light"] .preview-panel {
  background: #FFFFFF;
  border-color: rgba(108,60,225,0.15);
  box-shadow: 0 8px 32px rgba(108,60,225,0.08);
}
[data-theme="light"] .preview-header {
  background: rgba(108,60,225,0.05);
  border-bottom-color: rgba(108,60,225,0.12);
}
[data-theme="light"] .code-block {
  background: #F7F5FF;
  border-color: rgba(108,60,225,0.1);
  color: #2D2B55;
}
[data-theme="light"] .code-block .c-comment { color: #9CA3AF; }
[data-theme="light"] .output-block {
  background: rgba(16,185,129,0.04);
  border-color: rgba(16,185,129,0.2);
}

/* ── Exam ── */
[data-theme="light"] .exam-window {
  background: #FFFFFF;
  border-color: rgba(108,60,225,0.15);
  box-shadow: 0 8px 32px rgba(108,60,225,0.08);
}
[data-theme="light"] .exam-topbar {
  background: rgba(108,60,225,0.05);
  border-bottom-color: rgba(108,60,225,0.12);
}
[data-theme="light"] .exam-info-row { border-bottom-color: rgba(108,60,225,0.1); }
[data-theme="light"] .question-item {
  background: #FAFAFE;
  border-color: rgba(108,60,225,0.08);
}
[data-theme="light"] .question-item:hover {
  background: #F4EEFF;
  border-color: rgba(108,60,225,0.2);
}
[data-theme="light"] .q-option {
  border-color: rgba(108,60,225,0.12);
  color: var(--text-secondary);
}
[data-theme="light"] .q-option:hover {
  background: rgba(108,60,225,0.06);
  border-color: var(--primary-light);
  color: var(--primary);
}
[data-theme="light"] .q-option.selected {
  background: rgba(108,60,225,0.1);
  border-color: var(--primary-light);
  color: var(--primary);
}

/* ── Sidebar ── */
[data-theme="light"] .sidebar-card {
  background: #FFFFFF;
  border-color: rgba(108,60,225,0.12);
  box-shadow: 0 2px 16px rgba(108,60,225,0.06);
}
[data-theme="light"] .progress-bar-wrap { background: rgba(108,60,225,0.08); }
[data-theme="light"] .qn-btn {
  border-color: rgba(108,60,225,0.15);
  color: var(--text-muted);
}
[data-theme="light"] .qn-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(108,60,225,0.06);
}
[data-theme="light"] .qn-btn.answered {
  background: rgba(108,60,225,0.1);
  border-color: var(--primary-light);
  color: var(--primary);
}

/* ── Teacher ── */
[data-theme="light"] .teacher-card {
  background: #FFFFFF;
  border-color: rgba(108,60,225,0.12);
  box-shadow: 0 8px 48px rgba(108,60,225,0.08);
}
[data-theme="light"] .teacher-card::before {
  background: radial-gradient(circle, rgba(108,60,225,0.06), transparent 70%);
}

/* ── Testimonials ── */
[data-theme="light"] .testimonial-card {
  background: #FFFFFF;
  border-color: rgba(108,60,225,0.12);
  box-shadow: 0 2px 16px rgba(108,60,225,0.06);
}
[data-theme="light"] .testimonial-card:hover {
  background: #F8F5FF;
  box-shadow: 0 8px 32px rgba(108,60,225,0.12);
}
[data-theme="light"] .tc-text { color: var(--text-secondary); }

/* ── CTA ── */
[data-theme="light"] .cta-box {
  background: linear-gradient(135deg, rgba(108,60,225,0.08), rgba(6,182,212,0.05));
  border-color: rgba(108,60,225,0.2);
}
[data-theme="light"] .cta-box::before {
  background: radial-gradient(ellipse at 50% 0%, rgba(108,60,225,0.1), transparent 70%);
}

/* ── Footer ── */
[data-theme="light"] footer {
  background: #FFFFFF;
  border-top-color: rgba(108,60,225,0.1);
}
[data-theme="light"] .footer-bottom {
  border-top-color: rgba(108,60,225,0.08);
}
[data-theme="light"] .footer-col ul li a { color: var(--text-muted); }
[data-theme="light"] .footer-col ul li a:hover { color: var(--primary); }

/* ── Section tags ── */
[data-theme="light"] .section-tag { color: var(--primary); }
[data-theme="light"] .section-tag::before { background: var(--primary); }