/* ============================================================
   LUMINARY — FUTA Online Class Portal
   Design system: Light default · Dark mode via [data-theme="dark"]
   Fonts: Outfit (body) · Playfair Display (display) · JetBrains Mono (mono)
============================================================ */

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

/* ── Design tokens — LIGHT MODE (default) ── */
:root {
  /* Backgrounds */
  --bg:       #f5f7fa;
  --bg2:      #eef1f6;
  --bg3:      #e6eaf2;
  --bg4:      #d8dde8;
  --glass:    rgba(255, 255, 255, 0.75);
  --glass2:   rgba(240, 243, 250, 0.8);

  /* Primary — electric cyan */
  --cyan:        #0891b2;
  --cyan-dim:    #0e7490;
  --cyan-deep:   #164e63;
  --cyan-glow:   rgba(8, 145, 178, 0.15);
  --cyan-glow2:  rgba(8, 145, 178, 0.08);
  --cyan-border: rgba(8, 145, 178, 0.25);

  /* Accent — amber */
  --amber:       #d97706;
  --amber-dim:   #b45309;
  --amber-deep:  #451a03;
  --amber-glow:  rgba(217, 119, 6, 0.12);
  --amber-border:rgba(217, 119, 6, 0.28);

  /* Semantic */
  --emerald:        #059669;
  --emerald-bg:     rgba(5, 150, 105, 0.08);
  --emerald-border: rgba(5, 150, 105, 0.28);
  --rose:           #e11d48;
  --rose-bg:        rgba(225, 29, 72, 0.08);
  --rose-border:    rgba(225, 29, 72, 0.28);
  --violet:         #6366f1;

  /* Text */
  --text:        #0f172a;
  --text-2:      #334155;
  --text-muted:  #64748b;
  --text-dim:    #94a3b8;

  /* Borders */
  --border:      rgba(0, 0, 0, 0.09);
  --border2:     rgba(0, 0, 0, 0.05);

  /* Misc */
  --radius:      16px;
  --radius-sm:   10px;
  --radius-xs:   6px;
  --transition:  0.22s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
  --shadow-card: 0 2px 12px rgba(0,0,0,0.07), 0 1px 0 rgba(255,255,255,0.9) inset;
  --shadow-glow: 0 0 30px rgba(8, 145, 178, 0.12);

  /* Nav & footer specific */
  --nav-bg:      rgba(245, 247, 250, 0.92);
  --footer-bg:   rgba(245, 247, 250, 0.8);
}

/* ── DARK MODE tokens ── */
[data-theme="dark"] {
  --bg:       #1c1c1e;
  --bg2:      #242426;
  --bg3:      #2c2c2e;
  --bg4:      #323234;
  --glass:    rgba(44, 44, 46, 0.78);
  --glass2:   rgba(36, 36, 38, 0.85);

  --cyan:        #22d3ee;
  --cyan-dim:    #0891b2;
  --cyan-deep:   #164e63;
  --cyan-glow:   rgba(34, 211, 238, 0.18);
  --cyan-glow2:  rgba(34, 211, 238, 0.08);
  --cyan-border: rgba(34, 211, 238, 0.22);

  --amber:       #fbbf24;
  --amber-dim:   #d97706;
  --amber-deep:  #451a03;
  --amber-glow:  rgba(251, 191, 36, 0.15);
  --amber-border:rgba(251, 191, 36, 0.25);

  --emerald:        #10b981;
  --emerald-bg:     rgba(16, 185, 129, 0.1);
  --emerald-border: rgba(16, 185, 129, 0.3);
  --rose:           #f43f5e;
  --rose-bg:        rgba(244, 63, 94, 0.1);
  --rose-border:    rgba(244, 63, 94, 0.3);
  --violet:         #818cf8;

  --text:        #f2f2f7;
  --text-2:      #aeaeb2;
  --text-muted:  #6c6c70;
  --text-dim:    #3a3a3c;

  --border:      rgba(255, 255, 255, 0.07);
  --border2:     rgba(255, 255, 255, 0.04);

  --shadow-card: 0 4px 24px rgba(0,0,0,0.4), 0 1px 0 rgba(255,255,255,0.04) inset;
  --shadow-glow: 0 0 30px rgba(34, 211, 238, 0.12);

  --nav-bg:    rgba(28, 28, 30, 0.95);
  --footer-bg: rgba(17, 17, 19, 0.9);
}

/* ── System preference dark mode ── */
@media (prefers-color-scheme: dark) {
  [data-theme="system"] {
    --bg:       #1c1c1e;
    --bg2:      #242426;
    --bg3:      #2c2c2e;
    --bg4:      #323234;
    --glass:    rgba(44, 44, 46, 0.78);
    --glass2:   rgba(36, 36, 38, 0.85);

    --cyan:        #22d3ee;
    --cyan-dim:    #0891b2;
    --cyan-deep:   #164e63;
    --cyan-glow:   rgba(34, 211, 238, 0.18);
    --cyan-glow2:  rgba(34, 211, 238, 0.08);
    --cyan-border: rgba(34, 211, 238, 0.22);

    --amber:       #fbbf24;
    --amber-dim:   #d97706;
    --amber-glow:  rgba(251, 191, 36, 0.15);
    --amber-border:rgba(251, 191, 36, 0.25);

    --emerald:        #10b981;
    --emerald-bg:     rgba(16, 185, 129, 0.1);
    --emerald-border: rgba(16, 185, 129, 0.3);
    --rose:           #f43f5e;
    --rose-bg:        rgba(244, 63, 94, 0.1);
    --rose-border:    rgba(244, 63, 94, 0.3);
    --violet:         #818cf8;

    --text:        #f2f2f7;
    --text-2:      #aeaeb2;
    --text-muted:  #6c6c70;
    --text-dim:    #3a3a3c;

    --border:      rgba(255, 255, 255, 0.07);
    --border2:     rgba(255, 255, 255, 0.04);

    --shadow-card: 0 4px 24px rgba(0,0,0,0.4), 0 1px 0 rgba(255,255,255,0.04) inset;
    --nav-bg:    rgba(28, 28, 30, 0.95);
    --footer-bg: rgba(17, 17, 19, 0.9);
  }
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Outfit', system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  transition: background 0.3s, color 0.3s;
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   LAYERED BACKGROUND ATMOSPHERE
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: radial-gradient(circle, rgba(8,145,178,0.05) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
  z-index: 0;
}
[data-theme="dark"] body::before,
[data-theme="system"] body::before {
  background-image: radial-gradient(circle, rgba(34,211,238,0.06) 1px, transparent 1px);
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 45% at 15% 10%, rgba(8,145,178,0.06) 0%, transparent 70%),
    radial-gradient(ellipse 50% 40% at 85% 80%, rgba(217,119,6,0.04) 0%, transparent 70%),
    radial-gradient(ellipse 40% 50% at 50% 50%, rgba(99,102,241,0.03) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}
[data-theme="dark"] body::after {
  background:
    radial-gradient(ellipse 60% 45% at 15% 10%, rgba(34,211,238,0.07) 0%, transparent 70%),
    radial-gradient(ellipse 50% 40% at 85% 80%, rgba(251,191,36,0.05) 0%, transparent 70%),
    radial-gradient(ellipse 40% 50% at 50% 50%, rgba(99,102,241,0.04) 0%, transparent 70%);
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   NAVIGATION
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 28px;
  height: 64px;
  background: var(--nav-bg);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 0 rgba(8,145,178,0.06), 0 4px 20px rgba(0,0,0,0.06);
  transition: background 0.3s, border-color 0.3s;
}

.nav-crest {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--cyan) 0%, var(--cyan-dim) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  font-weight: 800;
  color: #fff;
  font-family: 'Playfair Display', serif;
  flex-shrink: 0;
  cursor: pointer;
  box-shadow: 0 0 16px var(--cyan-glow);
  transition: transform var(--transition), box-shadow var(--transition);
}
.nav-crest:hover {
  transform: scale(1.08);
  box-shadow: 0 0 24px var(--cyan-glow);
}

.nav-logo {
  font-family: 'Outfit', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  cursor: pointer;
  user-select: none;
  letter-spacing: -0.01em;
}
.nav-logo span {
  background: linear-gradient(90deg, var(--cyan), var(--amber));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-style: italic;
}

.nav-divider {
  width: 1px;
  height: 18px;
  background: var(--border);
  flex-shrink: 0;
}

.nav-breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
  flex-wrap: wrap;
}
.nav-breadcrumb .sep { opacity: 0.3; }
.nav-breadcrumb .crumb {
  cursor: pointer;
  color: var(--text-muted);
  transition: color var(--transition);
  padding: 2px 6px;
  border-radius: 4px;
}
.nav-breadcrumb .crumb:hover {
  color: var(--cyan);
  background: var(--cyan-glow2);
}
.nav-breadcrumb .crumb.active {
  color: var(--text-2);
  pointer-events: none;
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   PAGES & TRANSITIONS
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.page {
  display: none;
  position: relative;
  z-index: 1;
  animation: luminary-in 0.38s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}
.page.active { display: block; }

@keyframes luminary-in {
  from { opacity: 0; transform: translateY(20px) scale(0.99); }
  to   { opacity: 1; transform: translateY(0)   scale(1); }
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   HERO SECTION
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.hero {
  position: relative;
  padding: 80px 28px 60px;
  text-align: center;
  max-width: 860px;
  margin: 0 auto;
  overflow: hidden;
}

.hero-ornament {
  position: absolute;
  top: 32px;
  left: 50%;
  transform: translateX(-50%);
  width: 320px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan-border), transparent);
}
.hero-ornament::before, .hero-ornament::after {
  content: '';
  position: absolute;
  top: -3px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan);
}
.hero-ornament::before { left: 0; }
.hero-ornament::after  { right: 0; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.67rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
  border: 1px solid var(--cyan-border);
  background: var(--cyan-glow2);
  padding: 5px 16px;
  border-radius: 100px;
  margin-bottom: 32px;
  backdrop-filter: blur(8px);
}
.hero-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 6px var(--cyan);
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.5; transform: scale(0.7); }
}

.hero h1 {
  font-family: 'Playfair Display', serif;
  font-size: clamp(2.8rem, 7vw, 4.8rem);
  font-weight: 900;
  line-height: 1.04;
  color: var(--text);
  margin-bottom: 22px;
  letter-spacing: -0.025em;
}
.hero h1 .line2 {
  display: block;
  background: linear-gradient(90deg, var(--cyan) 0%, #0ea5e9 50%, var(--amber) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-style: italic;
}

.hero-rule {
  width: 48px;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
  border-radius: 100px;
  margin: 0 auto 24px;
  box-shadow: 0 0 12px var(--cyan-glow);
}

.hero p {
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 480px;
  margin: 0 auto;
  font-weight: 400;
  line-height: 1.75;
}

/* Stats row */
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 0;
  margin-top: 52px;
  max-width: 580px;
  margin-left: auto;
  margin-right: auto;
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-card);
}
.stat {
  flex: 1;
  padding: 22px 12px;
  text-align: center;
  border-right: 1px solid var(--border);
  position: relative;
  transition: background var(--transition);
}
.stat:hover { background: var(--cyan-glow2); }
.stat:last-child { border-right: none; }
.stat-num {
  font-family: 'Outfit', sans-serif;
  font-size: 2.1rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--cyan) 0%, var(--cyan-dim) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 5px;
}
.stat-label {
  font-size: 0.63rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   SECTION TITLES
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.section-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}
.section-title {
  font-family: 'Outfit', sans-serif;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
}
.section-rule {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--border), transparent);
}
.section-sub {
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-bottom: 26px;
  font-style: italic;
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   CONTAINER
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px 100px;
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   LEVEL GRID
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.level-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(185px, 1fr));
  gap: 16px;
}

.level-card {
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 22px;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
}

.level-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan-dim), var(--cyan), var(--amber));
  opacity: 0;
  transition: opacity var(--transition);
}

.level-card::after {
  content: '';
  position: absolute;
  top: -40px; right: -40px;
  width: 100px;
  height: 100px;
  background: radial-gradient(circle, var(--cyan-glow) 0%, transparent 70%);
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}

.level-card:hover {
  background: var(--glass2);
  border-color: var(--cyan-border);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.12), 0 0 0 1px var(--cyan-border), var(--shadow-glow);
}
.level-card:hover::before { opacity: 1; }
.level-card:hover::after  { opacity: 1; }

.level-card.empty {
  opacity: 0.45;
  cursor: default;
}
.level-card.empty:hover {
  transform: none;
  background: var(--glass);
  border-color: var(--border);
  box-shadow: var(--shadow-card);
}
.level-card.empty::before,
.level-card.empty::after { display: none; }

.level-badge {
  display: inline-flex;
  align-items: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 100px;
  margin-bottom: 16px;
  background: var(--cyan-glow2);
  color: var(--cyan);
  border: 1px solid var(--cyan-border);
}
.level-card.empty .level-badge {
  background: var(--border2);
  color: var(--text-dim);
  border-color: var(--border);
}

.level-name {
  font-family: 'Playfair Display', serif;
  font-size: 1.55rem;
  font-weight: 900;
  color: var(--text);
  margin-bottom: 3px;
  line-height: 1;
}
.level-full {
  font-size: 0.76rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  line-height: 1.45;
  font-weight: 400;
}
.level-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.72rem;
  font-family: 'JetBrains Mono', monospace;
}
.level-count {
  color: var(--cyan);
  font-weight: 600;
  letter-spacing: 0.02em;
}
.level-arrow {
  font-size: 0.9rem;
  color: var(--text-dim);
  transition: transform var(--transition-bounce), color var(--transition);
}
.level-card:hover .level-arrow {
  transform: translateX(5px);
  color: var(--cyan);
}
.coming-soon-tag {
  font-size: 0.66rem;
  color: var(--text-dim);
  font-style: italic;
  font-family: 'Outfit', sans-serif;
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   BACK BUTTON
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  color: var(--text-muted);
  background: var(--glass2);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  padding: 8px 16px;
  cursor: pointer;
  transition: all var(--transition);
  margin-bottom: 30px;
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.03em;
  backdrop-filter: blur(8px);
}
.back-btn:hover {
  color: var(--cyan);
  border-color: var(--cyan-border);
  background: var(--cyan-glow2);
  transform: translateX(-2px);
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   PAGE HEADER
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.page-header {
  padding: 48px 24px 0;
  max-width: 1140px;
  margin: 0 auto 40px;
  position: relative;
}
.page-header-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 8px;
}
.page-header-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--cyan);
  margin-bottom: 12px;
  opacity: 0.9;
}
.page-header-tag::before {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 6px var(--cyan);
}
.page-header h2 {
  font-family: 'Playfair Display', serif;
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  font-weight: 900;
  color: var(--text);
  margin-bottom: 10px;
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.page-header p {
  color: var(--text-muted);
  font-size: 0.92rem;
  font-style: italic;
}
.page-header-rule {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan-border), rgba(8,145,178,0.05), transparent);
  margin-top: 28px;
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   SEMESTER TABS
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.semester-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 28px;
  overflow-x: auto;
  scrollbar-width: none;
  padding: 4px;
  background: var(--glass2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  width: fit-content;
  max-width: 100%;
  backdrop-filter: blur(8px);
}
.semester-tabs::-webkit-scrollbar { display: none; }

.sem-tab {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 9px 20px;
  cursor: pointer;
  color: var(--text-muted);
  border-radius: var(--radius-xs);
  transition: all var(--transition);
  white-space: nowrap;
  text-transform: uppercase;
  border: 1px solid transparent;
}
.sem-tab:hover {
  color: var(--text);
  background: var(--cyan-glow2);
}
.sem-tab.active {
  color: #fff;
  background: linear-gradient(135deg, var(--cyan) 0%, var(--cyan-dim) 100%);
  border-color: transparent;
  box-shadow: 0 2px 12px var(--cyan-glow);
}

.sem-panel { display: none; }
.sem-panel.active {
  display: block;
  animation: luminary-in 0.28s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   COURSE GRID
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(285px, 1fr));
  gap: 14px;
}

.course-card {
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
}

.course-card::before {
  content: '';
  position: absolute;
  left: 0; top: 12px; bottom: 12px;
  width: 3px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--cyan-dim) 100%);
  border-radius: 0 3px 3px 0;
  opacity: 0;
  transition: opacity var(--transition);
}

.course-card:hover {
  background: var(--glass2);
  border-color: var(--cyan-border);
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.1), 0 0 0 1px var(--cyan-border);
}
.course-card:hover::before { opacity: 1; }

.course-card.empty { cursor: default; opacity: 0.45; }
.course-card.empty:hover {
  transform: none;
  background: var(--glass);
  border-color: var(--border);
  box-shadow: var(--shadow-card);
}
.course-card.empty::before { display: none; }

.course-code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--cyan);
  margin-bottom: 8px;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 6px;
}
.course-code::before {
  content: '';
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 4px var(--cyan);
}
.course-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 16px;
  line-height: 1.45;
}
.course-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.73rem;
  color: var(--text-muted);
}
.chapter-count {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--cyan);
  font-size: 0.68rem;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
  background: var(--cyan-glow2);
  padding: 3px 10px;
  border-radius: 100px;
  border: 1px solid var(--cyan-border);
}
.course-arrow {
  font-size: 0.9rem;
  color: var(--text-dim);
  transition: transform var(--transition-bounce), color var(--transition);
}
.course-card:hover .course-arrow {
  transform: translateX(5px);
  color: var(--cyan);
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   CHAPTER ACCORDION
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.chapter-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chapter-item {
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
  backdrop-filter: blur(12px);
}
.chapter-item:hover {
  border-color: var(--cyan-border);
}
.chapter-item.open {
  border-color: var(--cyan-border);
  box-shadow: 0 0 24px var(--cyan-glow2);
}

.chapter-header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 22px;
  cursor: pointer;
  transition: background var(--transition);
  user-select: none;
}
.chapter-header:hover {
  background: var(--cyan-glow2);
}

.ch-num {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--cyan-glow2);
  border: 1px solid var(--cyan-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Outfit', sans-serif;
  font-size: 0.88rem;
  font-weight: 800;
  color: var(--cyan);
  flex-shrink: 0;
  transition: all var(--transition);
}
.chapter-item.open .ch-num {
  background: linear-gradient(135deg, var(--cyan) 0%, var(--cyan-dim) 100%);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 14px var(--cyan-glow);
}

.ch-info { flex: 1; min-width: 0; }
.ch-label {
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-dim);
  font-family: 'JetBrains Mono', monospace;
  margin-bottom: 3px;
}
.chapter-item.open .ch-label { color: var(--cyan); opacity: 0.7; }
.ch-title {
  font-weight: 600;
  font-size: 0.93rem;
  color: var(--text);
  line-height: 1.35;
}

.ch-toggle {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  color: var(--text-dim);
  transition: all var(--transition-bounce);
  flex-shrink: 0;
}
.chapter-item.open .ch-toggle {
  transform: rotate(180deg);
  color: var(--cyan);
  border-color: var(--cyan-border);
  background: var(--cyan-glow2);
}

.chapter-body {
  display: none;
  padding: 0 22px 24px;
  border-top: 1px solid var(--border);
}
.chapter-item.open .chapter-body { display: block; }

.ch-summary {
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.75;
  margin: 18px 0 20px;
}

.ch-keypoints { margin-bottom: 22px; }
.ch-keypoints-title {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--cyan);
  margin-bottom: 12px;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
}
.ch-keypoints ul { list-style: none; display: flex; flex-direction: column; gap: 7px; }
.ch-keypoints ul li {
  display: flex;
  gap: 12px;
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.6;
}
.ch-keypoints ul li::before {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--cyan);
  flex-shrink: 0;
  margin-top: 9px;
  box-shadow: 0 0 6px var(--cyan-glow);
}

.ch-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 4px;
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   BUTTONS
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 600;
  font-family: 'JetBrains Mono', monospace;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  letter-spacing: 0.03em;
  text-decoration: none;
  position: relative;
  overflow: hidden;
}
.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0);
  transition: background var(--transition);
}
.btn:hover::after { background: rgba(255,255,255,0.08); }

.btn-primary {
  background: linear-gradient(135deg, var(--cyan) 0%, var(--cyan-dim) 100%);
  color: #fff;
  box-shadow: 0 2px 14px var(--cyan-glow);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 22px var(--cyan-glow);
}

.btn-secondary {
  background: var(--cyan-glow2);
  color: var(--cyan);
  border: 1px solid var(--cyan-border);
}
.btn-secondary:hover {
  background: var(--cyan-glow);
  transform: translateY(-1px);
}

.btn-ghost {
  background: var(--glass2);
  color: var(--text-muted);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  background: var(--glass);
  color: var(--text);
  border-color: var(--cyan-border);
}

.btn-test {
  background: linear-gradient(135deg, #312e81 0%, #1e1b4b 100%);
  color: var(--violet);
  border: 1px solid rgba(129,140,248,0.3);
}
.btn-test:hover {
  background: linear-gradient(135deg, #3730a3 0%, #312e81 100%);
  border-color: rgba(129,140,248,0.55);
  transform: translateY(-1px);
  box-shadow: 0 4px 18px rgba(99,102,241,0.25);
}

.btn:disabled, .btn.disabled {
  opacity: 0.35;
  cursor: not-allowed;
  pointer-events: none;
  transform: none !important;
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   CBT MODAL
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(12px) saturate(130%);
  -webkit-backdrop-filter: blur(12px) saturate(130%);
  z-index: 999;
  padding: 20px;
  overflow-y: auto;
}
.modal-overlay.open {
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

.modal {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 36px;
  width: 100%;
  max-width: 680px;
  margin: auto;
  animation: luminary-in 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  position: relative;
  box-shadow: 0 32px 80px rgba(0,0,0,0.2), 0 0 0 1px var(--cyan-border);
}

.modal::before {
  content: '';
  position: absolute;
  top: 0; left: 40px; right: 40px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan), var(--amber), transparent);
  border-radius: 0 0 2px 2px;
}

.modal-close {
  position: absolute;
  top: 18px; right: 20px;
  background: var(--glass2);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all var(--transition);
  width: 30px;
  height: 30px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.modal-close:hover {
  color: var(--rose);
  border-color: var(--rose-border);
  background: var(--rose-bg);
}

.modal-header { margin-bottom: 28px; }
.modal-title {
  font-family: 'Outfit', sans-serif;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 5px;
}
.modal-subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-style: italic;
}

.cbt-progress {
  background: var(--border);
  border-radius: 100px;
  height: 5px;
  margin-bottom: 28px;
  overflow: hidden;
}
.cbt-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--cyan-dim), var(--cyan));
  border-radius: 100px;
  transition: width 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 0 8px var(--cyan-glow);
}

.cbt-q-count {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.06em;
}

.cbt-question {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text);
  line-height: 1.7;
  margin-bottom: 24px;
  padding: 18px 20px;
  background: var(--cyan-glow2);
  border: 1px solid var(--cyan-border);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--cyan);
}

.cbt-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 22px;
}
.cbt-option {
  background: var(--glass2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 13px 18px;
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: all var(--transition);
  text-align: left;
  font-family: 'Outfit', sans-serif;
  font-weight: 500;
  position: relative;
  overflow: hidden;
}
.cbt-option::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--cyan);
  transform: scaleY(0);
  transition: transform var(--transition);
  border-radius: 0 2px 2px 0;
}
.cbt-option:hover {
  background: var(--cyan-glow2);
  border-color: var(--cyan-border);
  color: var(--text);
  transform: translateX(3px);
}
.cbt-option:hover::before { transform: scaleY(1); }

.cbt-option.selected-correct {
  background: var(--emerald-bg);
  border-color: var(--emerald-border);
  color: var(--emerald);
}
.cbt-option.selected-wrong {
  background: var(--rose-bg);
  border-color: var(--rose-border);
  color: var(--rose);
}
.cbt-option.reveal-correct {
  background: var(--amber-glow);
  border-color: var(--amber-border);
  color: var(--amber);
}
.cbt-option:disabled, .cbt-option[disabled] {
  pointer-events: none;
  transform: none;
}

.cbt-option.test-selected {
  background: var(--emerald-bg);
  border-color: var(--emerald-border);
  color: var(--emerald);
  padding-right: 46px;
}
.cbt-option.test-selected::before { display: none; }
.cbt-option.test-selected::after {
  content: '✓';
  position: absolute;
  right: 15px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1rem;
  font-weight: 700;
  color: var(--emerald);
  line-height: 1;
}
.cbt-option.test-selected:hover {
  background: rgba(5,150,105,0.12);
  border-color: var(--emerald-border);
  color: var(--emerald);
  transform: translateX(3px);
}

.cbt-feedback {
  font-size: 0.85rem;
  padding: 13px 16px;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  display: none;
  line-height: 1.6;
  font-weight: 500;
}
.cbt-feedback.show  { display: block; }
.cbt-feedback.correct {
  background: var(--emerald-bg);
  color: var(--emerald);
  border: 1px solid var(--emerald-border);
  border-left: 3px solid var(--emerald);
}
.cbt-feedback.wrong {
  background: var(--rose-bg);
  color: var(--rose);
  border: 1px solid var(--rose-border);
  border-left: 3px solid var(--rose);
}

.cbt-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-top: 6px;
}
.cbt-prev-btn {
  min-width: 120px;
  justify-content: center;
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   QUESTION NAVIGATOR
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.cbt-qnav-wrap {
  margin: 20px 0 8px;
  padding: 16px;
  background: var(--glass2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.cbt-qnav-label {
  display: flex;
  gap: 18px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.qnav-legend {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6rem;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.qnav-dot {
  width: 8px;
  height: 8px;
  border-radius: 3px;
  flex-shrink: 0;
}
.qnav-dot.answered { background: var(--emerald); }
.qnav-dot.skipped  { background: var(--rose); }
.qnav-dot.future   { background: var(--cyan-border); }

.cbt-qnav {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.qnav-box {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  font-weight: 700;
  cursor: pointer;
  border: 1.5px solid transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-bounce), box-shadow var(--transition), background var(--transition);
  line-height: 1;
  outline: none;
}
.qnav-box:hover { transform: translateY(-2px); }

.qnav-box.qnav-current {
  background: var(--cyan-glow2);
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: 0 0 12px var(--cyan-glow);
}
.qnav-box.qnav-answered {
  background: var(--emerald-bg);
  border-color: var(--emerald-border);
  color: var(--emerald);
}
.qnav-box.qnav-future {
  background: var(--cyan-glow2);
  border-color: var(--cyan-border);
  color: var(--cyan-dim);
}
.qnav-box.qnav-skipped {
  background: var(--rose-bg);
  border-color: var(--rose-border);
  color: var(--rose);
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   SCORE / RESULTS SCREEN
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.cbt-score-screen {
  text-align: center;
  padding: 24px 0;
}

.score-ring {
  width: 130px;
  height: 130px;
  border-radius: 50%;
  background: conic-gradient(var(--cyan) var(--pct, 0%), var(--border) 0%);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 26px;
  position: relative;
  box-shadow: 0 0 40px var(--cyan-glow);
}
.score-ring::before {
  content: '';
  position: absolute;
  inset: 12px;
  background: var(--bg2);
  border-radius: 50%;
}
.score-num {
  position: relative;
  z-index: 1;
  font-family: 'Outfit', sans-serif;
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text);
}
.score-label {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
  font-family: 'Outfit', sans-serif;
}
.score-sub {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   FILL-IN-THE-BLANK
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.cbt-fitb-wrap {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 22px;
}

.cbt-fitb-input {
  width: 100%;
  box-sizing: border-box;
  padding: 14px 18px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.95rem;
  background: var(--cyan-glow2);
  border: 1.5px solid var(--cyan-border);
  border-radius: var(--radius-sm);
  color: var(--text);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
}
.cbt-fitb-input:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px var(--cyan-glow2);
  background: var(--cyan-glow2);
}
.cbt-fitb-input::placeholder {
  color: var(--text-dim);
  font-style: italic;
}
.cbt-fitb-input:disabled { pointer-events: none; opacity: 0.7; }

.cbt-fitb-input.fitb-correct {
  border-color: var(--emerald-border);
  background: var(--emerald-bg);
  color: var(--emerald);
}
.cbt-fitb-input.fitb-wrong {
  border-color: var(--rose-border);
  background: var(--rose-bg);
  color: var(--rose);
}
.cbt-fitb-input.fitb-shake {
  animation: shake 0.5s ease;
  border-color: var(--rose) !important;
}
@keyframes shake {
  0%,100% { transform: translateX(0); }
  20%      { transform: translateX(-8px); }
  40%      { transform: translateX(8px); }
  60%      { transform: translateX(-5px); }
  80%      { transform: translateX(5px); }
}
.cbt-fitb-btn { align-self: flex-start; }
.cbt-fitb-btn:disabled { opacity: 0.4; pointer-events: none; }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   TEST REVIEW PANEL
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.test-review {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.test-review-header {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 4px;
}
.review-item {
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  border-left: 3px solid var(--border);
  background: var(--glass2);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.review-item.review-correct {
  border-left-color: var(--emerald);
  background: var(--emerald-bg);
}
.review-item.review-wrong {
  border-left-color: var(--rose);
  background: var(--rose-bg);
}
.review-item.review-skipped {
  border-left-color: var(--text-dim);
  opacity: 0.6;
}
.review-q-header {
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.review-q-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  white-space: nowrap;
  margin-top: 2px;
}
.review-q-text {
  font-size: 0.88rem;
  color: var(--text);
  line-height: 1.55;
  font-weight: 500;
}
.review-answer-row {
  display: flex;
  gap: 8px;
  align-items: baseline;
  flex-wrap: wrap;
  font-size: 0.83rem;
}
.review-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  color: var(--text-dim);
  white-space: nowrap;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.review-val-correct { color: var(--emerald); font-weight: 600; }
.review-val-wrong   { color: var(--rose); text-decoration: line-through; opacity: 0.8; }
.review-explanation {
  font-size: 0.83rem;
  color: var(--text-muted);
  line-height: 1.6;
  padding-top: 8px;
  border-top: 1px solid var(--border);
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   COMING SOON
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.coming-soon-banner {
  background: var(--cyan-glow2);
  border: 1px dashed var(--cyan-border);
  border-radius: var(--radius);
  padding: 64px 30px;
  text-align: center;
  margin-top: 10px;
}
.coming-soon-banner .icon {
  font-size: 2.4rem;
  margin-bottom: 18px;
  display: block;
  filter: grayscale(0.3);
}
.coming-soon-banner h3 {
  font-family: 'Outfit', sans-serif;
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
}
.coming-soon-banner p {
  color: var(--text-muted);
  font-size: 0.88rem;
  max-width: 360px;
  margin: 0 auto;
  font-style: italic;
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   FOOTER
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.site-footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 40px 24px;
  border-top: 1px solid var(--border);
  background: var(--footer-bg);
  transition: background 0.3s;
}
.footer-rule {
  width: 64px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan), var(--amber), transparent);
  margin: 0 auto 20px;
  border-radius: 100px;
}
.footer-logo {
  font-family: 'Outfit', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
}
.footer-logo span {
  background: linear-gradient(90deg, var(--cyan), var(--amber));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-style: italic;
}
.footer-tagline {
  font-style: italic;
  font-size: 0.83rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.footer-credit {
  font-size: 0.73rem;
  color: var(--text-dim);
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.04em;
}
.footer-credit strong { color: var(--cyan); font-weight: 600; }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   TIMER
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
#cbt-timer {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--cyan);
  background: var(--cyan-glow2);
  border: 1px solid var(--cyan-border);
  padding: 4px 14px;
  border-radius: var(--radius-xs);
  letter-spacing: 0.05em;
  box-shadow: 0 0 12px var(--cyan-glow2);
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   SCROLLBAR
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb {
  background: var(--bg4);
  border-radius: 100px;
}
::-webkit-scrollbar-thumb:hover { background: var(--cyan-dim); }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   RESPONSIVE
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
@media (max-width: 640px) {
  nav { padding: 0 16px; gap: 10px; }
  .hero { padding: 56px 18px 40px; }
  .container { padding: 0 16px 70px; }

  .level-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
  .course-grid { grid-template-columns: 1fr; }
  .modal { padding: 24px 18px; border-radius: 16px; }

  .hero-stats {
    flex-direction: column;
    border: none;
    background: transparent;
    gap: 8px;
  }
  .stat {
    border-right: none;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--glass);
  }

  .qnav-box { width: 32px; height: 32px; font-size: 0.65rem; border-radius: 6px; }
  .cbt-nav { flex-wrap: wrap; }
  .cbt-prev-btn { min-width: auto; }
  .semester-tabs { padding: 3px; gap: 4px; }
  .sem-tab { padding: 8px 14px; font-size: 0.68rem; }
}

@media (max-width: 400px) {
  .level-grid { grid-template-columns: 1fr; }
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   SELECTION & FOCUS
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
::selection {
  background: var(--cyan-glow);
  color: var(--text);
}
:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   GET STARTED BUTTON
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.hero-cta {
  margin-top: 40px;
  display: flex;
  justify-content: center;
}

.btn-get-started {
  padding: 18px 52px;
  font-size: 1rem;
  font-weight: 700;
  font-family: 'Outfit', sans-serif;
  background: linear-gradient(135deg, var(--cyan) 0%, var(--cyan-dim) 100%);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  box-shadow: 0 0 32px var(--cyan-glow), 0 4px 20px rgba(0,0,0,0.1);
  transition: transform var(--transition-bounce), box-shadow var(--transition);
  letter-spacing: 0.01em;
  position: relative;
  overflow: hidden;
}
.btn-get-started::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0);
  transition: background var(--transition);
}
.btn-get-started:hover {
  transform: translateY(-4px) scale(1.03);
  box-shadow: 0 0 56px var(--cyan-glow), 0 8px 32px rgba(0,0,0,0.15);
}
.btn-get-started:hover::before {
  background: rgba(255,255,255,0.08);
}
.btn-get-started:active {
  transform: translateY(-1px) scale(1.01);
}

@media (max-width: 640px) {
  .btn-get-started {
    padding: 16px 36px;
    font-size: 0.95rem;
  }
}