/* ════════════════════════════════════════════════════════════
   Shrutam US — site.css
   Loaded AFTER shrutam-base.css (canonical shrutam.ai CSS).
   Contains ONLY shrutam-us-specific page components.
   Base tokens (--bg-base, --accent, etc) + .btn/.card/.pill/.nav/.container/
   all Tailwind utilities live in shrutam-base.css.
   ════════════════════════════════════════════════════════════ */

/* ───── Mobile safety: never let content cause horizontal scroll ───── */
html, body { max-width: 100vw; overflow-x: hidden; }
*, *::before, *::after { box-sizing: border-box; }
img, video, iframe, table, pre, code { max-width: 100%; }
h1, h2, h3, h4 { overflow-wrap: break-word; word-break: normal; hyphens: auto; }
pre { overflow-x: auto; }

/* ───── Hero H1 — responsive desktop → mobile in one rule ───── */
.hero-h1 { font-size: clamp(1.35rem, 4.5vw + 0.5rem, 3.25rem); line-height: 1.15; }

/* ───── Mobile typography: scale headings DOWN on narrow viewports ───── */
@media (max-width: 640px) {
  .hero-h1 { font-size: 1.35rem !important; line-height: 1.25; }
  h1, .lesson-title, .course-title { font-size: clamp(1.2rem, 5.5vw, 1.6rem) !important; line-height: 1.25; }
  h2, .shr-h2 { font-size: clamp(1.15rem, 4.5vw, 1.5rem) !important; }
  h3 { font-size: clamp(1rem, 4vw, 1.2rem) !important; }
  body { font-size: 0.95rem; }
  p, .lede { font-size: 0.9rem; line-height: 1.55; }
  .container { padding-left: 0.85rem !important; padding-right: 0.85rem !important; max-width: 100vw !important; }
  .section { padding-left: 0 !important; padding-right: 0 !important; }
  main { padding-left: 0 !important; padding-right: 0 !important; }
  /* Hero CTAs: stack vertically full-width on mobile */
  .section .flex.flex-wrap.justify-center,
  .shr-page-head .flex.flex-wrap.justify-center,
  .hero-cta-row {
    flex-direction: column; align-items: stretch !important; gap: 0.5rem !important;
  }
  .section .flex.flex-wrap.justify-center > .btn,
  .shr-page-head .flex.flex-wrap.justify-center > .btn,
  .hero-cta-row > .btn, .hero-cta-row > .hero-cta {
    width: 100%; justify-content: center;
  }
  /* Card content tighter padding */
  .card, .shr-card { padding: 1.1rem !important; }
  .nav { padding-left: 0.75rem; padding-right: 0.75rem; }
  .lesson-section-head { gap: 0.5rem; }
  .lesson-section-head h2 { padding-left: 0.5rem !important; }
  .tabs { padding-left: 0 !important; padding-right: 0 !important; }
  .tab { padding: 0.75rem 0.85rem; font-size: 0.85rem; }
  .tab-count { display: none; }
  .mock-timer-bar { padding: 0.5rem 0.75rem; }
  .mock-timer-display { font-size: 1rem; }
  /* hero CTAs stack */
  .hero-cta-row, .shr-page-head .flex.flex-wrap { flex-direction: column; align-items: stretch; }
  .hero-cta-row .btn, .hero-cta-row .hero-cta { width: 100%; justify-content: center; }
}

/* ───── Skip link (a11y) ───── */
.skip-link {
  z-index: 9999; background: var(--accent); color: var(--text-inverse);
  padding: 0.75rem 1.5rem; font-weight: 600;
  position: absolute; top: -100%; left: 0; text-decoration: none;
}
.skip-link:focus { top: 0; }

/* ───── A11y tooling (override base for high-contrast/invert modes) ───── */
:root[data-contrast="high"] {
  --bg-base: #000; --bg-surface: #000; --bg-elevated: #0a0a0a;
  --text-primary: #fff; --text-body: #fff; --text-secondary: #f5f5f5;
  --border-subtle: #fff; --border-default: #fff; --accent: #fbbf24;
}
:root.a11y-dyslexia { --font-body: 'OpenDyslexic', 'Comic Sans MS', system-ui, sans-serif; }
:root.a11y-dyslexia, :root.a11y-dyslexia .lesson-body { letter-spacing: 0.04em; word-spacing: 0.12em; line-height: 1.85; }
:root.a11y-spacing, :root.a11y-spacing body { line-height: 1.9; letter-spacing: 0.05em; word-spacing: 0.14em; }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; } }

/* ───── Spacing tokens (used by shrutam-us components) ───── */
:root {
  --space-1: 4px; --space-2: 8px; --space-3: 12px; --space-4: 16px;
  --space-5: 24px; --space-6: 32px; --space-7: 48px; --space-8: 64px;
  --tap: 44px;
  --coral: #ff7b72;

  /* ── Legacy aliases (old USWDS-era token names that older partials reference) ── */
  --base:             var(--text-secondary);
  --base-darkest:     var(--text-primary);
  --base-dark:        var(--text-body);
  --base-light:       var(--text-muted);
  --base-lighter:     var(--bg-elevated);
  --base-lightest:    var(--bg-surface);
  --bg:               var(--bg-base);
  --accent-warm:       var(--accent);
  --accent-warm-light: var(--accent-light);
  --accent-warm-dark:  var(--accent-dark);
  --accent-warm-pale:  var(--accent-faint);
  --primary-darkest:  var(--bg-base);
  --primary-dark:     var(--bg-surface);
  --primary-mid:      var(--primary);
  --primary-lighter:  var(--accent-glow);
}

/* ── Legacy class aliases so old PHP pages still render ── */
.hero-cta {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.75rem 1.5rem; border-radius: var(--radius);
  font-family: var(--font-head, Nunito, sans-serif); font-weight: 600; font-size: 0.9375rem;
  text-decoration: none; cursor: pointer; min-height: var(--tap); min-width: 44px;
  background: var(--accent); color: var(--text-inverse); border: none;
  transition: all 0.2s ease; line-height: 1;
}
.hero-cta:hover { background: var(--accent-light); color: var(--text-inverse); transform: translateY(-1px); box-shadow: var(--shadow-saffron); }
.hero-cta.secondary { background: transparent; color: var(--text-body); border: 1px solid var(--border-default); }
.hero-cta.secondary:hover { background: var(--bg-elevated); color: var(--accent); border-color: var(--accent); }
.hero, section.hero {
  background: linear-gradient(135deg, var(--bg-base) 0%, var(--bg-surface) 100%);
  padding: clamp(3rem, 6vw, 5rem) 0; color: var(--text-primary);
  border-bottom: 1px solid var(--border-subtle);
}
.hero h1 { font-family: var(--font-head); color: var(--text-primary); font-size: clamp(2rem, 4.5vw, 3rem); font-weight: 800; margin: 0 0 1rem; }
.hero p  { color: var(--text-body); font-size: 1.05rem; line-height: 1.6; max-width: 720px; margin: 0 0 1.5rem; }
.hero-cta-row { display: flex; gap: 0.75rem; flex-wrap: wrap; }
.section-pad { padding: clamp(2.5rem, 5vw, 4rem) 0; }
.section-h { font-family: var(--font-head); color: var(--text-primary); font-size: clamp(1.4rem, 2.8vw, 1.8rem); font-weight: 800; margin: 0 0 0.5rem; }
.section-sub { color: var(--text-body); font-size: 1.05rem; margin-bottom: 1.5rem; }
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1rem; }
.card-link, .card.card-link { display: block; text-decoration: none; color: inherit; }
.card-disabled { opacity: 0.55; cursor: default; }
.card-meta { display: flex; gap: 0.75rem; align-items: center; flex-wrap: wrap; color: var(--text-secondary); font-size: 0.85rem; margin-top: 0.5rem; }
.card-meta i { color: var(--accent); margin-right: 0.25rem; }
.trust-block { padding: clamp(2.5rem, 5vw, 4rem) 0; background: var(--bg-surface); border-top: 1px solid var(--border-subtle); border-bottom: 1px solid var(--border-subtle); text-align: center; }
.trust-badges { display: flex; flex-wrap: wrap; gap: 0.75rem; justify-content: center; }
.trust-badge {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.4rem 0.9rem; border-radius: 9999px;
  background: var(--accent-glow); color: var(--accent);
  border: 1px solid rgba(245,158,11,0.25);
  font-family: var(--font-body); font-size: 0.85rem; font-weight: 600;
}
.howit-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.25rem; }
.howit-step { background: var(--bg-surface); border: 1px solid var(--border-subtle); border-radius: var(--radius-lg); padding: 1.5rem; }
.howit-step h3 { font-family: var(--font-head); color: var(--text-primary); margin: 0.5rem 0 0.5rem; font-size: 1.15rem; }
.howit-step p { color: var(--text-body); line-height: 1.6; margin: 0; }
.howit-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 2.5rem; height: 2.5rem; border-radius: 50%;
  background: var(--accent); color: var(--text-inverse);
  font-family: var(--font-head); font-weight: 800; font-size: 1.1rem;
}
.accent { color: var(--accent); }

/* ════════════════════════════════════════════════════════════
   SHARED PAGE PRIMITIVES (shr-*)
   thin wrappers — defer to shrutam-base.css .card/.btn where possible
   ════════════════════════════════════════════════════════════ */

.shr-breadcrumb { font-size: 0.85rem; color: var(--text-secondary); margin-bottom: var(--space-4); }
.shr-breadcrumb ol { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: var(--space-2); align-items: center; }
.shr-breadcrumb a { color: var(--text-body); text-decoration: none; }
.shr-breadcrumb a:hover { color: var(--accent); }
.shr-breadcrumb [aria-current="page"] { color: var(--text-primary); font-weight: 600; }
.shr-breadcrumb-sep { color: var(--text-secondary); opacity: 0.5; }

.shr-page-head { margin-bottom: var(--space-6); }
.shr-page-head h1 {
  font-family: var(--font-head, Nunito, sans-serif); color: var(--text-primary);
  font-size: clamp(1.5rem, 3vw, 2.1rem); font-weight: 800;
  margin: 0 0 var(--space-2); line-height: 1.2;
}
.shr-page-head h1 i { color: var(--accent); margin-right: var(--space-2); }
.shr-page-head p.lede { font-size: 1.05rem; color: var(--text-body); line-height: 1.6; max-width: 720px; margin: 0; }

.shr-h2 {
  font-family: var(--font-head, Nunito, sans-serif); color: var(--text-primary);
  font-size: 1.35rem; font-weight: 700;
  margin: 0 0 var(--space-4); padding-left: var(--space-3);
  border-left: 4px solid var(--accent);
}

.shr-empty {
  background: var(--bg-surface); border: 1px dashed var(--border-default);
  padding: var(--space-5); border-radius: var(--radius);
  color: var(--text-body); text-align: center;
}
.shr-empty a { color: var(--accent); }

.shr-spotlight {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark, #d97706));
  color: var(--text-inverse); border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
  display: flex; gap: var(--space-4); align-items: center; flex-wrap: wrap;
  box-shadow: var(--shadow); margin-bottom: var(--space-5);
}
.shr-spotlight i.shr-spotlight-icon { font-size: 2rem; flex-shrink: 0; }
.shr-spotlight h2 { margin: 0 0 var(--space-1); color: var(--text-inverse); font-family: var(--font-head); font-size: 1.25rem; }
.shr-spotlight p { margin: 0; opacity: 0.92; font-size: 0.95rem; line-height: 1.5; }
.shr-spotlight-body { flex: 1; min-width: 240px; }
.shr-spotlight .btn-outline { color: var(--text-inverse); border-color: rgba(0,0,0,0.25); background: rgba(0,0,0,0.18); }
.shr-spotlight .btn-outline:hover { background: rgba(0,0,0,0.32); color: var(--text-inverse); border-color: rgba(0,0,0,0.4); }

.shr-grid { display: grid; gap: var(--space-4); }
.shr-grid--2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.shr-grid--3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

.shr-card-eyebrow {
  font-family: 'JetBrains Mono', monospace; font-size: 0.72rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--accent); background: var(--accent-glow);
  padding: 0.18rem 0.55rem; border-radius: var(--radius-sm);
  display: inline-block; border: 1px solid rgba(245,158,11,0.2);
}
.shr-card-eyebrow-row { display: flex; gap: var(--space-3); align-items: center; margin-bottom: var(--space-2); flex-wrap: wrap; }
.shr-card-meta { color: var(--text-secondary); font-size: 0.85rem; display: flex; gap: var(--space-3); flex-wrap: wrap; align-items: center; }
.shr-card-meta i { color: var(--accent); margin-right: var(--space-1); }
.shr-card-cta { display: inline-flex; align-items: center; gap: var(--space-2); color: var(--accent); font-weight: 700; font-size: 0.92rem; margin-top: var(--space-3); }

/* ════════════════════════════════════════════════════════════
   COURSE LANDING PAGE
   ════════════════════════════════════════════════════════════ */

.course-hero {
  background: linear-gradient(135deg, var(--bg-base) 0%, var(--bg-surface) 100%);
  color: var(--text-primary); padding: var(--space-7) var(--space-5);
  border-bottom: 1px solid var(--border-subtle);
}
.course-hero .container { max-width: 1024px; margin: 0 auto; }
.course-body { padding: var(--space-7) var(--space-5); }
.course-breadcrumb ol {
  list-style: none; padding: 0; margin: 0 0 var(--space-3);
  display: flex; gap: var(--space-2); flex-wrap: wrap;
  font-size: 0.85rem; color: var(--text-secondary);
}
.course-breadcrumb a { color: var(--text-body); text-decoration: none; }
.course-breadcrumb a:hover { color: var(--accent); }
.course-eyebrow {
  color: var(--accent); font-size: 0.85rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.08em;
  margin: 0 0 var(--space-2); font-family: var(--font-head);
}
.course-title { color: var(--text-primary); font-family: var(--font-head); font-size: clamp(1.75rem, 4vw, 2.75rem); margin: 0 0 var(--space-3); font-weight: 800; }
.course-desc { color: var(--text-body); max-width: 760px; margin: 0 0 var(--space-4); font-size: 1.05rem; line-height: 1.6; }
.course-stats { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-4); }
.stat-pill {
  background: var(--bg-elevated); border: 1px solid var(--border-subtle);
  border-radius: 9999px; padding: 0.5rem 1rem;
  font-size: 0.85rem; color: var(--text-body);
  display: inline-flex; align-items: center; gap: var(--space-2);
}
.stat-pill i { color: var(--accent); font-size: 0.85rem; }
.course-exam-format { color: var(--text-body); font-size: 0.92rem; margin: 0; }
.course-exam-format strong { color: var(--accent); font-weight: 700; }

.course-tabs {
  display: flex; gap: var(--space-2); border-bottom: 2px solid var(--border-subtle);
  margin-bottom: var(--space-6); overflow-x: auto; scrollbar-width: none;
}
.course-tabs::-webkit-scrollbar { display: none; }
.ctab {
  background: none; border: none; border-bottom: 3px solid transparent;
  padding: var(--space-3) var(--space-5); color: var(--text-secondary);
  font-family: var(--font-head); font-size: 0.95rem; font-weight: 600;
  cursor: pointer; display: inline-flex; align-items: center; gap: var(--space-2);
  white-space: nowrap; min-height: var(--tap); transition: all 0.2s ease;
}
.ctab:hover { color: var(--text-body); background: var(--bg-elevated); }
.ctab.is-active { color: var(--accent); border-bottom-color: var(--accent); background: var(--bg-base); }
.ctab i { color: var(--accent); }
.ctab .tab-count { background: var(--accent-glow); color: var(--accent); font-size: 0.72rem; font-weight: 700; padding: 0.12rem 0.55rem; border-radius: 9999px; }
.ctab-panel { display: none; }
.ctab-panel.is-active { display: block; }

.unit-block { margin-bottom: var(--space-7); background: var(--bg-surface); border: 1px solid var(--border-subtle); border-radius: var(--radius-lg); overflow: hidden; }
.unit-header { background: var(--bg-elevated); padding: var(--space-4) var(--space-5); display: flex; align-items: center; gap: var(--space-3); flex-wrap: wrap; border-bottom: 1px solid var(--border-subtle); }
.unit-badge {
  background: var(--primary); color: #fff;
  padding: var(--space-1) var(--space-3); border-radius: var(--radius-sm);
  font-family: 'JetBrains Mono', monospace; font-size: 0.78rem; font-weight: 700;
}
.unit-badge-saffron { background: var(--accent); color: var(--text-inverse); }
.unit-badge-coral   { background: var(--coral); color: #fff; }
.unit-title { font-family: var(--font-head); font-size: 1.15rem; margin: 0; color: var(--text-primary); flex: 1; min-width: 0; font-weight: 700; }
.unit-weight { font-size: 0.82rem; color: var(--text-secondary); font-weight: 600; }

.lesson-list { list-style: none; padding: 0; margin: 0; }
.lesson-row { border-bottom: 1px solid var(--border-subtle); }
.lesson-row:last-child { border-bottom: none; }
.lesson-row a {
  display: flex; align-items: center; gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  text-decoration: none; color: var(--text-body); transition: background 0.12s;
  min-height: var(--tap);
}
.lesson-row a:hover { background: var(--bg-elevated); color: var(--text-primary); }
.lesson-row.is-pending a { color: var(--text-muted); cursor: default; }
.lesson-row.is-pending a:hover { background: transparent; }
.lesson-code { font-family: 'JetBrains Mono', monospace; font-weight: 700; color: var(--accent); min-width: 56px; flex-shrink: 0; font-size: 0.92rem; }
.lesson-title-text { flex: 1; font-weight: 600; line-height: 1.4; }
.lesson-meta-inline { display: inline-flex; gap: var(--space-3); align-items: center; flex-shrink: 0; flex-wrap: wrap; }
.meta-time { color: var(--text-secondary); font-size: 0.82rem; display: inline-flex; align-items: center; gap: var(--space-1); }
.meta-status { font-family: var(--font-head); font-size: 0.78rem; font-weight: 600; padding: var(--space-1) var(--space-2); border-radius: var(--radius-sm); display: inline-flex; align-items: center; gap: var(--space-1); }
.meta-status-live { background: rgba(34,197,94,0.12); color: var(--success); }
.meta-status-pending { background: var(--bg-elevated); color: var(--text-muted); }
.empty-state { padding: var(--space-7) var(--space-5); text-align: center; color: var(--text-secondary); background: var(--bg-surface); border-radius: var(--radius); }
@media (max-width: 640px) {
  .lesson-row a { flex-wrap: wrap; }
  .lesson-meta-inline { width: 100%; padding-left: 64px; }
}

/* ════════════════════════════════════════════════════════════
   LESSON PAGE
   ════════════════════════════════════════════════════════════ */

.lesson-breadcrumb ol {
  list-style: none; padding: var(--space-3) 0; margin: 0;
  display: flex; gap: var(--space-2); flex-wrap: wrap;
  font-size: 0.85rem; color: var(--text-secondary);
}
.lesson-meta {
  color: var(--text-secondary); font-size: 0.9rem;
  display: flex; flex-wrap: wrap; gap: var(--space-4); margin: var(--space-3) 0;
  align-items: center;
}
.lesson-meta i { color: var(--accent); margin-right: var(--space-1); }
.mcq-progress { display: flex; align-items: center; }
.lesson-title { font-family: var(--font-head); color: var(--text-primary); margin: 0 0 var(--space-2); font-weight: 800; }
.lesson-summary {
  background: var(--accent-glow); border-left: 4px solid var(--accent);
  padding: var(--space-3) var(--space-4); border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text-body); margin: var(--space-4) 0; line-height: 1.65;
}
.lesson-summary strong { color: var(--accent); font-weight: 700; }
.lesson-wrap { position: relative; }

.audio-bar-sticky {
  position: sticky; top: var(--nav-h, 76px); z-index: 50;
  background: var(--bg-surface); border: 1px solid var(--border-subtle);
  border-radius: var(--radius); padding: var(--space-2) var(--space-4);
  margin: var(--space-3) 0; display: flex; align-items: center; gap: var(--space-3);
  box-shadow: var(--shadow-sm);
}
.audio-bar-sticky i { color: var(--accent); }
.audio-bar-sticky audio { flex: 1; }

.tabs {
  display: flex; gap: var(--space-1); overflow-x: auto;
  border-bottom: 2px solid var(--border-subtle);
  margin: var(--space-5) 0 0; padding: 0;
  scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }
.tab {
  background: transparent; border: none; border-bottom: 3px solid transparent;
  padding: var(--space-3) var(--space-4); color: var(--text-secondary);
  font-family: var(--font-head); font-size: 0.9375rem; font-weight: 600;
  cursor: pointer; display: inline-flex; align-items: center; gap: var(--space-2);
  white-space: nowrap; min-height: var(--tap);
  border-radius: var(--radius-sm) var(--radius-sm) 0 0; transition: all 0.2s ease;
}
.tab:hover { background: var(--bg-elevated); color: var(--text-body); }
.tab.is-active { color: var(--accent); border-bottom-color: var(--accent); background: var(--bg-base); }
.tab i { font-size: 0.95rem; color: var(--accent); }
.tab-count { background: var(--accent-glow); color: var(--accent); font-size: 0.72rem; font-weight: 700; padding: 0.1rem 0.5rem; border-radius: 9999px; }
.tab-panel { display: none; padding: var(--space-5) 0; }
.tab-panel.is-active { display: block; }

.lesson-section {
  margin: var(--space-6) 0; padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border-subtle);
}
.lesson-section:last-child { border-bottom: none; }
.lesson-section-head {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-3); margin: 0 0 var(--space-3); flex-wrap: wrap;
}
.lesson-section-head h2 { margin: 0; }
.lesson-section > h2, .lesson-section-head h2 {
  color: var(--text-primary); font-family: var(--font-head);
  font-size: 1.4rem; font-weight: 700;
  padding-left: var(--space-3); border-left: 4px solid var(--accent);
}

.bookmark-btn {
  position: absolute; top: 0; right: 0;
  background: var(--bg-surface); border: 1px solid var(--border-subtle);
  color: var(--text-secondary); width: 44px; height: 44px;
  border-radius: var(--radius); cursor: pointer; transition: all 0.2s ease;
}
.bookmark-btn:hover { color: var(--accent); border-color: var(--accent); }
.bookmark-btn[aria-pressed="true"] { color: var(--accent); }

/* Lesson body: full-width content (no narrow column). Cards/callouts/examples
   inside extend to the parent .lesson-section width. */
.lesson-body { max-width: 100%; width: 100%; }
.lesson-body p { margin: 0 0 var(--space-4); line-height: 1.75; color: var(--text-body); max-width: 100%; }
.lesson-body ul, .lesson-body ol { margin: 0 0 var(--space-4) var(--space-5); padding-left: var(--space-3); color: var(--text-body); max-width: 100%; }
.lesson-body .example-block,
.lesson-body .step-list,
.lesson-body .step-card,
.lesson-body .callout,
.lesson-body figure,
.lesson-body table,
.lesson-body pre { max-width: 100%; width: 100%; }
.lesson-body li { padding: var(--space-1) 0; line-height: 1.7; }
.lesson-body h2, .lesson-body h3, .lesson-body h4 { margin-top: var(--space-5); margin-bottom: var(--space-3); color: var(--text-primary); font-family: var(--font-head); }
.lesson-body strong { color: var(--accent); font-weight: 700; }
.lesson-body em { color: var(--text-primary); }
.lesson-body blockquote {
  border-left: 4px solid var(--accent); background: var(--accent-glow);
  margin: var(--space-4) 0; padding: var(--space-3) var(--space-4);
  font-style: italic; color: var(--text-body); border-radius: 0 var(--radius) var(--radius) 0;
}
.lesson-body code { background: var(--bg-elevated); color: var(--accent); padding: 0.1em 0.4em; border-radius: var(--radius-sm); font-family: 'JetBrains Mono', monospace; font-size: 0.9em; }
.lesson-body pre {
  background: #0a0f1a; color: #e6edf3;
  border-radius: var(--radius); padding: var(--space-4);
  overflow-x: auto; margin: var(--space-4) 0;
  border: 1px solid var(--border-subtle);
}
.lesson-body pre code { background: transparent; color: inherit; padding: 0; }
.lesson-body a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.lesson-body a:hover { color: var(--accent-light); }

/* ───── Java code-runner ───── */
.code-block-wrap { background: #0d1117; border: 1px solid var(--border-subtle); border-radius: var(--radius); overflow: hidden; margin: var(--space-4) 0; }
.code-block-header { background: #161b22; border-bottom: 1px solid rgba(150,180,220,0.12); padding: var(--space-2) var(--space-4); display: flex; align-items: center; justify-content: space-between; }
.code-lang-tag { font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--accent); font-family: 'JetBrains Mono', monospace; }
.code-copy-btn, .code-run-btn { background: none; border: 1px solid rgba(255,255,255,0.15); color: #d0d7de; cursor: pointer; font-size: 0.78rem; padding: 0.25rem 0.6rem; border-radius: var(--radius-sm); display: flex; align-items: center; gap: 0.3rem; }
.code-run-btn { background: rgba(34,197,94,0.18); border-color: rgba(34,197,94,0.4); color: #4ade80; font-weight: 700; }
.code-run-btn:hover:not(:disabled) { background: rgba(34,197,94,0.32); }
.code-run-btn:disabled { opacity: 0.4; cursor: wait; }
.ace-editor-wrap { background: #1a1e2e; min-height: 100px; }
.ace-editor-wrap .ace_editor { font-size: 13px !important; line-height: 1.65 !important; }
.run-output { padding: var(--space-3) var(--space-4); border-top: 1px solid rgba(96,165,250,0.1); font-family: 'JetBrains Mono', monospace; font-size: 0.82rem; line-height: 1.65; white-space: pre-wrap; word-break: break-word; color: #e6edf3; background: #0a0f1a; }
.run-output.run-ok      { color: #22c55e; }
.run-output.run-error   { color: var(--error); }
.run-output.run-empty   { color: var(--text-muted); font-style: italic; }
.run-output.run-pending { color: var(--text-secondary); }

/* ───── Inline SVG figure (Physics free-body diagrams, motion graphs, etc.) ───── */
.lesson-svg-figure {
  margin: 0 0 var(--space-5); padding: var(--space-4);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle); border-radius: var(--radius);
  text-align: center;
}
.lesson-svg-figure svg { max-width: 100%; height: auto; display: block; margin: 0 auto; }
.lesson-svg-caption {
  margin: var(--space-3) 0 0; color: var(--text-secondary);
  font-size: 0.88rem; line-height: 1.55; text-align: center; font-style: italic;
}

/* ───── FRQ card (on lesson) ───── */
.frq-card { border: 1px solid var(--border-subtle); border-radius: var(--radius); padding: var(--space-5); margin-bottom: var(--space-5); background: var(--bg-surface); }
.frq-card details > div { background: var(--bg-elevated); padding: var(--space-4); border-radius: var(--radius); margin-top: var(--space-2); }
.frq-card details summary { cursor: pointer; padding: var(--space-2); color: var(--accent); font-weight: 600; min-height: var(--tap); display: flex; align-items: center; }

/* ════════════════════════════════════════════════════════════
   MISCONCEPTION CARDS
   ════════════════════════════════════════════════════════════ */
.misc-intro {
  background: linear-gradient(135deg, var(--accent-glow), rgba(245,158,11,0.02));
  border-left: 3px solid var(--accent);
  padding: var(--space-3) var(--space-4);
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 0 0 var(--space-5); color: var(--text-body); line-height: 1.6;
}
.misc-cards { display: flex; flex-direction: column; gap: var(--space-5); }
.misc-card { background: var(--bg-surface); border: 1px solid var(--border-subtle); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-sm); transition: all 0.3s ease; }
.misc-card:hover { border-color: var(--border-default); box-shadow: var(--shadow); transform: translateY(-2px); }
.misc-strip { padding: var(--space-3) var(--space-5); display: grid; grid-template-columns: auto auto 1fr; align-items: start; gap: var(--space-2) var(--space-3); border-top: 1px solid var(--border-subtle); }
.misc-strip:first-child { border-top: none; }
.misc-strip i { font-size: 1.05rem; line-height: 1.4; align-self: center; }
.misc-num { font-family: 'JetBrains Mono', monospace; font-weight: 700; font-size: 0.78rem; color: var(--text-secondary); align-self: center; }
.misc-strip-label { font-family: var(--font-head); font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; align-self: center; }
.misc-strip-text { grid-column: 1 / -1; margin: var(--space-1) 0 0; color: var(--text-body); line-height: 1.65; font-size: 0.96rem; }
.misc-strip--mistake { background: linear-gradient(180deg, rgba(255,123,114,0.10), rgba(255,123,114,0.02)); border-left: 4px solid var(--coral); grid-template-columns: auto auto 1fr auto auto; }
.misc-strip--mistake i, .misc-strip--mistake .misc-strip-label { color: var(--coral); }
.misc-strip--mistake .misc-strip-text { color: var(--text-primary); font-weight: 600; font-size: 1.02rem; }
.misc-strip--why { background: linear-gradient(180deg, var(--accent-glow), rgba(245,158,11,0.02)); border-left: 4px solid var(--accent); }
.misc-strip--why i, .misc-strip--why .misc-strip-label { color: var(--accent); }
.misc-strip--fix { background: linear-gradient(180deg, rgba(34,197,94,0.10), rgba(34,197,94,0.02)); border-left: 4px solid var(--success); }
.misc-strip--fix i, .misc-strip--fix .misc-strip-label { color: var(--success); }
.misc-code { grid-column: 1 / -1; background: #0a0f1a !important; color: #e6edf3; padding: var(--space-3) var(--space-4); margin: var(--space-2) 0 0; border-radius: var(--radius); border: 1px solid rgba(34,197,94,0.20); font-family: 'JetBrains Mono', monospace; font-size: 0.85rem; line-height: 1.6; overflow-x: auto; }

/* ════════════════════════════════════════════════════════════
   SUMMARY CHEAT-SHEET TAB
   ════════════════════════════════════════════════════════════ */
.sum-tldr { background: linear-gradient(135deg, var(--accent), var(--accent-dark, #d97706)); color: var(--text-inverse); border-radius: var(--radius-lg); padding: var(--space-4) var(--space-5); margin-bottom: var(--space-5); box-shadow: var(--shadow); }
.sum-tldr-label { font-family: 'JetBrains Mono', monospace; font-size: 0.7rem; font-weight: 800; letter-spacing: 0.12em; opacity: 0.85; }
.sum-tldr p { margin: var(--space-2) 0 0; font-size: 1.1rem; line-height: 1.55; font-weight: 600; color: var(--text-inverse); }
.sum-tldr-head { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); margin-bottom: var(--space-2); flex-wrap: wrap; }
.sum-tldr-head .block-tts { background: rgba(0,0,0,0.18); color: var(--text-inverse); border-color: rgba(0,0,0,0.32); }
.sum-tldr-head .block-tts:hover { background: rgba(0,0,0,0.32); color: var(--text-inverse); }

.sum-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-4); }
.sum-card--full { grid-column: 1 / -1; }
.sum-card { background: var(--bg-surface); border: 1px solid var(--border-subtle); border-radius: var(--radius-lg); padding: var(--space-4) var(--space-5); transition: all 0.3s ease; }
.sum-card:hover { border-color: var(--border-default); }
.sum-card-head { display: flex; align-items: center; gap: var(--space-2); font-family: var(--font-head); font-size: 0.92rem; font-weight: 700; color: var(--accent); margin-bottom: var(--space-3); padding-bottom: var(--space-2); border-bottom: 1px solid var(--border-subtle); }
.sum-card-head i { color: var(--accent); }
.sum-card--code pre { background: #0a0f1a; color: #e6edf3; padding: var(--space-3) var(--space-4); border-radius: var(--radius); margin: 0; overflow-x: auto; font-family: 'JetBrains Mono', monospace; font-size: 0.86rem; line-height: 1.65; border: 1px solid var(--border-subtle); }
.sum-chips { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.sum-chip { background: var(--bg-elevated); color: var(--text-body); border: 1px solid var(--border-subtle); padding: 0.32rem 0.72rem; border-radius: 9999px; font-family: 'JetBrains Mono', monospace; font-size: 0.82rem; font-weight: 500; transition: all 0.2s ease; }
.sum-chip:hover { border-color: var(--accent); color: var(--accent); }

.sum-checklist { list-style: none; padding: 0; margin: 0; }
.sum-checklist li { display: grid; grid-template-columns: auto 1fr; gap: var(--space-3); padding: var(--space-2) 0; border-bottom: 1px dashed var(--border-subtle); align-items: start; }
.sum-checklist li:last-child { border-bottom: none; }
.sum-checklist i { color: var(--success); font-size: 1.05rem; margin-top: 2px; }
.sum-checklist strong { color: var(--accent); font-family: 'JetBrains Mono', monospace; font-size: 0.85rem; }

.sum-eks { margin: 0; display: grid; grid-template-columns: auto 1fr; gap: var(--space-2) var(--space-4); }
.sum-eks dt { font-family: 'JetBrains Mono', monospace; font-weight: 700; font-size: 0.85rem; color: var(--accent); background: var(--accent-glow); padding: 0.15rem 0.55rem; border-radius: var(--radius-sm); align-self: start; white-space: nowrap; }
.sum-eks dd { margin: 0; color: var(--text-primary); line-height: 1.6; font-size: 0.95rem; }
.sum-mermaid { background: var(--bg-elevated) !important; padding: var(--space-4) !important; border-radius: var(--radius); }
.sum-audio-script { background: var(--bg-surface); border: 1px solid var(--border-subtle); border-radius: var(--radius); padding: var(--space-4); margin-top: var(--space-5); }
.sum-audio-script summary { cursor: pointer; color: var(--accent); font-weight: 600; min-height: var(--tap); display: flex; align-items: center; }
.sum-audio-script p { margin: var(--space-3) 0 0; color: var(--text-body); line-height: 1.7; }
@media (max-width: 720px) {
  .sum-grid { grid-template-columns: 1fr; }
  .sum-eks { grid-template-columns: 1fr; }
  .sum-eks dt { justify-self: start; }
}

/* ════════════════════════════════════════════════════════════
   LISTEN BUTTON (per-block teacher narration TTS)
   ════════════════════════════════════════════════════════════ */
.block-tts {
  display: inline-flex; align-items: center; gap: 0.4rem;
  background: var(--accent-glow); color: var(--accent);
  border: 1px solid rgba(245,158,11,0.3); border-radius: 9999px;
  padding: 0.4rem 0.9rem; cursor: pointer;
  font-family: var(--font-body, Inter, sans-serif); font-size: 0.82rem; font-weight: 600;
  min-height: 32px; transition: all 0.2s ease;
}
.block-tts:hover { background: var(--accent); color: var(--text-inverse); transform: translateY(-1px); box-shadow: 0 4px 12px var(--accent-glow); }
.block-tts.is-playing { background: var(--accent); color: var(--text-inverse); animation: ttsPulse 1.6s ease-in-out infinite; }
.block-tts.is-playing i::before { content: "\f04c"; }
@keyframes ttsPulse {
  0%,100% { box-shadow: 0 0 0 0 rgba(245,158,11,0.4); }
  50%     { box-shadow: 0 0 0 6px rgba(245,158,11,0); }
}
.block-tts i { font-size: 0.9rem; }
.misc-strip--mistake .block-tts { grid-row: 1; align-self: center; background: rgba(255,123,114,0.15); color: var(--coral); border-color: var(--coral); }
.misc-strip--mistake .block-tts:hover { background: var(--coral); color: var(--text-inverse); box-shadow: 0 4px 12px rgba(255,123,114,0.25); }

/* ════════════════════════════════════════════════════════════
   MCQ CARDS (lesson tab + mock taker)
   ════════════════════════════════════════════════════════════ */
.mcq-card { background: var(--bg-surface); border: 1px solid var(--border-subtle); border-radius: var(--radius-lg); padding: var(--space-5); margin-bottom: var(--space-4); }
.mcq-card h2 { font-family: var(--font-head); color: var(--text-primary); margin: 0 0 var(--space-3); font-weight: 800; }
.mcq-item { background: var(--bg-surface); border: 1px solid var(--border-subtle); border-radius: var(--radius); padding: var(--space-4); margin-bottom: var(--space-4); }
.mcq-q-num { font-size: 0.78rem; color: var(--text-secondary); margin-bottom: var(--space-2); display: flex; gap: var(--space-2); align-items: center; flex-wrap: wrap; }
.mcq-q-text { font-weight: 500; line-height: 1.65; color: var(--text-primary); margin-bottom: var(--space-3); font-size: 1.02rem; }
.mcq-q-text table, .frq-scenario table, .lesson-body table { border-collapse: collapse; margin: var(--space-3) 0; background: var(--bg-elevated); border-radius: var(--radius-sm); overflow: hidden; }
.mcq-q-text th, .mcq-q-text td, .frq-scenario th, .frq-scenario td, .lesson-body th, .lesson-body td { padding: var(--space-2) var(--space-3); border-bottom: 1px solid var(--border-subtle); text-align: left; font-size: 0.95rem; }
.mcq-q-text th, .frq-scenario th, .lesson-body th { color: var(--accent-light); font-weight: 700; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.05em; background: rgba(245,158,11,0.06); }
.mcq-q-figure, .frq-figure { margin: 0 0 var(--space-3) 0; background: var(--bg-base); border: 1px solid var(--border-subtle); border-radius: var(--radius-sm); padding: var(--space-3); max-width: 480px; }
.mcq-q-figure object, .frq-figure object { display: block; width: 100%; height: auto; max-height: 360px; }
.mcq-explanation table { margin-top: var(--space-2); }

/* Lesson-body interactive figures — same surface as question figures.
   Component (SVG) widgets size themselves via viewBox + width:100%;
   no forced min-height so the card hugs the content (no black voids). */
.lesson-figure { margin: var(--space-4) 0; background: var(--bg-base); border: 1px solid var(--border-subtle); border-radius: var(--radius-sm); padding: var(--space-3) var(--space-3) var(--space-2); max-width: 640px; margin-left: auto; margin-right: auto; }
.lesson-figure .shr-widget { display: block; }
.lesson-figure .shr-widget > svg { display: block; width: 100%; height: auto; max-height: 480px; }
.lesson-figure-caption { font-size: 0.85rem; color: var(--text-muted); text-align: center; margin-top: var(--space-2); font-style: italic; }
.mcq-choices { display: flex; flex-direction: column; gap: var(--space-2); margin-bottom: var(--space-3); }
.mcq-choice { padding: var(--space-3) var(--space-4); border: 1px solid var(--border-subtle); border-radius: var(--radius-sm); cursor: pointer; display: flex; gap: var(--space-3); align-items: baseline; color: var(--text-body); transition: all 0.12s ease; }
.mcq-choice:hover { background: var(--bg-elevated); border-color: var(--border-default); }
.mcq-choice.selected { background: var(--accent-glow); border-color: var(--accent); color: var(--text-primary); }
.choice-letter, .mcq-choice-letter { font-family: 'JetBrains Mono', monospace; font-weight: 700; color: var(--accent); min-width: 1.4em; }
.mcq-reveal-btn { background: var(--accent-glow); color: var(--accent); border: 1px solid rgba(245,158,11,0.3); padding: 0.5rem 1rem; border-radius: var(--radius-sm); cursor: pointer; font-family: var(--font-body); font-weight: 600; font-size: 0.875rem; min-height: 36px; display: inline-flex; align-items: center; gap: var(--space-2); transition: all 0.2s ease; }
.mcq-reveal-btn:hover { background: var(--accent); color: var(--text-inverse); }
.mcq-answer { display: none; padding: var(--space-3) var(--space-4); background: rgba(34,197,94,0.08); border-left: 3px solid var(--success); border-radius: var(--radius-sm); color: var(--text-body); line-height: 1.6; margin-top: var(--space-3); }
.mcq-answer strong { color: var(--success); }
.mcq-item.revealed .mcq-answer { display: block; }
.mcq-item.revealed .mcq-choice.correct { border-color: var(--success); background: rgba(34,197,94,0.10); color: var(--text-primary); }
.mcq-item.revealed .mcq-choice.correct .choice-letter, .mcq-item.revealed .mcq-choice.correct .mcq-choice-letter { color: var(--success); }
.mcq-item.revealed .mcq-reveal-btn { display: none; }

/* MCQ interactive states (click → feedback) */
.mcq-item { position: relative; overflow: hidden; }
.mcq-choice { position: relative; }
.mcq-choice[role="button"]:focus-visible { outline: 2px solid var(--primary-light); outline-offset: 2px; }
.choice-feedback-icon { margin-left: auto; font-family: 'Font Awesome 6 Free'; font-weight: 900; font-size: 1.1rem; opacity: 0; transition: opacity 0.2s; }
.mcq-choice.is-correct,
.mcq-choice.is-correct-answer {
  background: rgba(34,197,94,0.14);
  border-color: var(--success);
  color: var(--text-primary);
}
.mcq-choice.is-correct .choice-letter,
.mcq-choice.is-correct-answer .choice-letter { color: var(--success); }
.mcq-choice.is-correct .choice-feedback-icon::before,
.mcq-choice.is-correct-answer .choice-feedback-icon::before {
  content: '\f00c'; color: var(--success); /* fa-check */
}
.mcq-choice.is-correct .choice-feedback-icon,
.mcq-choice.is-correct-answer .choice-feedback-icon { opacity: 1; }
.mcq-choice.is-incorrect {
  background: rgba(255, 123, 114, 0.12);
  border-color: var(--coral);
  color: var(--text-primary);
}
.mcq-choice.is-incorrect .choice-letter { color: var(--coral); }
.mcq-choice.is-incorrect .choice-feedback-icon::before {
  content: '\f00d'; color: var(--coral); /* fa-xmark */
}
.mcq-choice.is-incorrect .choice-feedback-icon { opacity: 1; }
.mcq-item.answered .mcq-choice[aria-disabled="true"] { cursor: default; }
.mcq-item.answered .mcq-choice[aria-disabled="true"]:not(.is-correct):not(.is-incorrect):not(.is-correct-answer):hover {
  background: var(--bg-surface);
  border-color: var(--border-subtle);
}

/* Star celebration overlay (Lottie animation appears center of mcq item) */
.mcq-celebrate {
  position: absolute;
  top: 50%; left: 50%;
  width: 280px; height: 280px;
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 5;
  opacity: 1;
  transition: opacity 0.4s ease;
}
.mcq-celebrate.fade-out { opacity: 0; }
@media (prefers-reduced-motion: reduce) {
  .mcq-celebrate { display: none !important; }
}
.mcq-nav { display: flex; gap: var(--space-3); justify-content: center; margin-top: var(--space-4); align-items: center; }
.mcq-nav-btn { background: var(--bg-elevated); color: var(--text-body); border: 1px solid var(--border-default); padding: 0.5rem 1rem; border-radius: var(--radius-sm); cursor: pointer; font: inherit; min-height: 36px; }
.mcq-nav-btn:hover:not(:disabled) { background: var(--accent-glow); color: var(--accent); border-color: var(--accent); }
.mcq-nav-btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* ════════════════════════════════════════════════════════════
   MOCK TAKER PAGE
   ════════════════════════════════════════════════════════════ */
.mock-page .card { margin-bottom: var(--space-4); }
.mock-timer-bar { position: sticky; top: var(--nav-h, 76px); z-index: 100; background: var(--bg-surface); border: 1px solid var(--border-subtle); border-radius: var(--radius); padding: var(--space-3) var(--space-4); display: flex; gap: var(--space-3); align-items: center; flex-wrap: wrap; margin-bottom: var(--space-5); box-shadow: var(--shadow-sm); }
.mock-timer-display { font-family: 'JetBrains Mono', monospace; font-size: 1.2rem; font-weight: 700; color: var(--accent); display: inline-flex; gap: var(--space-2); align-items: center; }
.mock-reveal-all { margin-left: auto; }
.mock-section { margin-bottom: var(--space-7); }
.frq-item h3 { font-family: var(--font-head); color: var(--text-primary); margin: 0 0 var(--space-2); font-weight: 800; }
.frq-scenario { margin-top: var(--space-3); }
.frq-part-h { margin-top: var(--space-4); color: var(--accent); font-family: var(--font-head); font-size: 1.05rem; }
.frq-answer { width: 100%; min-height: 100px; background: var(--bg-elevated); color: var(--text-primary); border: 1px solid var(--border-default); border-radius: var(--radius-sm); padding: var(--space-3); margin-top: var(--space-2); font: inherit; line-height: 1.55; resize: vertical; }
.frq-answer:focus { outline: 2px solid var(--accent); outline-offset: 2px; border-color: var(--accent); }
.frq-sample-block { margin-top: var(--space-4); border-top: 1px solid var(--border-subtle); padding-top: var(--space-3); }
.frq-sample-block summary { cursor: pointer; color: var(--accent); font-weight: 600; min-height: var(--tap); display: flex; align-items: center; }
.frq-sample-body { background: var(--bg-elevated); padding: var(--space-4); border-radius: var(--radius); margin-top: var(--space-3); }
.frq-sample-h { font-family: var(--font-head); margin: 0 0 var(--space-2); }
.frq-sample-h.success { color: var(--success); }
.frq-sample-h.accent { color: var(--accent); margin-top: var(--space-4); }
@media (max-width: 640px) {
  .mock-timer-bar { padding: var(--space-2) var(--space-3); }
  .mock-reveal-all { margin-left: 0; flex-basis: 100%; justify-content: center; }
}

/* ════════════════════════════════════════════════════════════
   MOCKS LANDING
   ════════════════════════════════════════════════════════════ */
.mocks-card { display: flex; gap: var(--space-4); flex-wrap: wrap; justify-content: space-between; align-items: center; }
.mocks-card-body { flex: 1; min-width: 240px; }
.mocks-card h2 { font-family: var(--font-head); color: var(--text-primary); margin: 0 0 var(--space-2); font-size: 1.2rem; font-weight: 800; }
.mocks-card p { color: var(--text-body); margin: 0 0 var(--space-2); }

/* ════════════════════════════════════════════════════════════
   CRAM SHEET (printable)
   ════════════════════════════════════════════════════════════ */
.cram-controls { display: flex; gap: var(--space-3); align-items: center; flex-wrap: wrap; margin-bottom: var(--space-5); }
.cram-controls-hint { color: var(--text-secondary); font-size: 0.9rem; }
.cram-paper { background: var(--bg-surface); border: 1px solid var(--border-subtle); border-radius: var(--radius-lg); padding: var(--space-6); box-shadow: var(--shadow); }
.cram-header { border-bottom: 3px solid var(--accent); padding-bottom: var(--space-3); margin-bottom: var(--space-4); }
.cram-header h1 { font-family: var(--font-head); color: var(--text-primary); margin: 0; font-size: 1.6rem; font-weight: 800; }
.cram-url { color: var(--text-secondary); font-size: 0.85rem; font-family: 'JetBrains Mono', monospace; margin: var(--space-2) 0 0; }
.cram-tldr { background: var(--bg-elevated); border-left: 4px solid var(--accent); padding: var(--space-3) var(--space-4); margin-bottom: var(--space-5); font-style: italic; color: var(--text-body); line-height: 1.65; }
.cram-section-h { margin-top: var(--space-6); }
.cram-section-h.coral { border-left-color: var(--coral); color: var(--text-primary); }
.cram-footer { margin-top: var(--space-6); padding-top: var(--space-3); border-top: 1px solid var(--border-subtle); color: var(--text-secondary); font-size: 0.85rem; }

/* ════════════════════════════════════════════════════════════
   LESSON RENDERING POLISH (mermaid, lists, inline code)
   ════════════════════════════════════════════════════════════ */
/* ════════════════════════════════════════════════════════════
   CHALKBOARD WATCH PLAYER (crash/cram Watch tab)
   ════════════════════════════════════════════════════════════ */
.chalkboard-player {
  position: relative;
  margin: var(--space-4) 0;
  background: linear-gradient(180deg, #0a1f1a 0%, #061612 100%);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(34, 197, 94, 0.18);
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5),
              inset 0 1px 0 rgba(255, 255, 255, 0.04);
}
.chalkboard-stage {
  position: relative;
  min-height: 420px;
  padding: var(--space-6) var(--space-6);
  background:
    radial-gradient(circle at 20% 20%, rgba(255,255,255,0.025), transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(255,255,255,0.02), transparent 60%);
}
.chalkboard-stage::before {
  content: '';
  position: absolute; inset: 0;
  background-image:
    repeating-linear-gradient(0deg,
      transparent 0,
      transparent 22px,
      rgba(255, 255, 255, 0.018) 22px,
      rgba(255, 255, 255, 0.018) 23px);
  pointer-events: none;
  opacity: 0.6;
}
.board-slide {
  display: none;
  color: #e8f5e9;
  font-family: 'Nunito', sans-serif;
  position: relative;
  z-index: 1;
}
.board-slide.is-active { display: block; animation: boardFadeIn 0.4s ease; }
@keyframes boardFadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.board-slide-head {
  border-bottom: 2px dashed rgba(255, 255, 255, 0.15);
  padding-bottom: var(--space-3);
  margin-bottom: var(--space-4);
}
.board-slide-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
  display: inline-block;
}
.board-slide-title {
  font-family: 'Caveat', 'Patrick Hand', 'Comic Sans MS', cursive;
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  font-weight: 700;
  color: #f0f9f4;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.1), 0 0 18px rgba(245, 158, 11, 0.06);
  margin: 0 0 var(--space-2);
  letter-spacing: 0.01em;
  line-height: 1.15;
}
.board-slide-subtitle {
  color: rgba(255, 255, 255, 0.7);
  font-size: 1rem;
  font-style: italic;
  margin: 0;
}
.board-slide-body {
  font-size: 1.05rem;
  line-height: 1.75;
  color: #d4f0db;
  max-width: 900px;
}
.board-slide-body strong { color: #fcd34d; }
.board-slide-body em     { color: #93c5fd; font-style: italic; }
.board-slide-body code {
  background: rgba(0, 0, 0, 0.4);
  color: #ffcb6b;
  padding: 0.15em 0.45em;
  border-radius: 4px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.88em;
  border: 1px solid rgba(252, 211, 77, 0.25);
}
.board-slide-body ul, .board-slide-body ol {
  padding-left: var(--space-5);
  margin: var(--space-3) 0;
}
.board-slide-body li {
  margin-bottom: var(--space-2);
  position: relative;
}
.board-slide-body li::marker { color: rgba(252, 211, 77, 0.7); }
.board-slide-body p { margin: 0 0 var(--space-3); }
.board-slide-body p:last-child { margin-bottom: 0; }
/* Chapter divider slide (empty-body section) — shows upcoming sections */
.divider-lede {
  font-family: 'Caveat', cursive;
  font-size: 1.5rem;
  color: rgba(255, 255, 255, 0.7);
  text-align: center;
  margin: var(--space-4) 0 var(--space-4);
}
.divider-list {
  list-style: none !important;
  padding: 0 !important;
  margin: 0 auto !important;
  max-width: 540px;
  display: flex; flex-direction: column;
  gap: var(--space-2);
}
.divider-list li {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: rgba(255, 255, 255, 0.04);
  border: 1px dashed rgba(255, 255, 255, 0.16);
  border-radius: var(--radius);
  color: #d4f0db;
  font-family: 'Caveat', 'Patrick Hand', cursive;
  font-size: 1.35rem;
  line-height: 1.3;
}
.divider-num {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: rgba(252, 211, 77, 0.2);
  color: #fcd34d;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}

/* Cover slide special styling */
.board-slide[data-slide-idx="0"] .board-slide-title {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  text-align: center;
}
.board-slide[data-slide-idx="0"] .board-slide-subtitle { text-align: center; }
.board-slide[data-slide-idx="0"] .board-slide-body { text-align: center; max-width: 720px; margin: 0 auto; }

/* Player controls */
.chalkboard-controls {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: linear-gradient(180deg, rgba(0,0,0,0.3), rgba(0,0,0,0.5));
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}
.cb-btn {
  width: 44px; height: 44px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
  display: inline-flex; align-items: center; justify-content: center;
  cursor: pointer;
  font-size: 0.95rem;
  transition: all 0.2s;
  flex-shrink: 0;
}
.cb-btn:hover:not(:disabled) {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--text-inverse);
  transform: scale(1.05);
}
.cb-btn:disabled { opacity: 0.35; cursor: not-allowed; }
.cb-btn-play { background: var(--accent); border-color: var(--accent); color: var(--text-inverse); width: 56px; height: 56px; font-size: 1.15rem; }
.cb-btn-play:hover:not(:disabled) { background: var(--accent-light); }
.cb-btn-play.is-playing i::before { content: '\f04c'; } /* fa-pause */

.cb-progress-wrap {
  flex: 1;
  display: flex; align-items: center; gap: var(--space-3);
}
.cb-progress {
  flex: 1;
  height: 8px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 9999px;
  overflow: hidden;
}
.cb-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  border-radius: 9999px;
  transition: width 0.3s ease;
}
.cb-progress-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.7);
  min-width: 60px;
  text-align: center;
}
.cb-speed-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #fff;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 0.85rem;
  cursor: pointer;
  min-width: 56px;
  min-height: 36px;
}
.cb-speed-btn:hover { background: var(--accent); border-color: var(--accent); color: var(--text-inverse); }
.cb-meta {
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-align: center;
  margin: var(--space-3) 0 0;
  padding: 0 var(--space-4);
}
.cb-meta i { color: var(--accent); margin-right: 0.4rem; }
.cb-meta strong { color: var(--text-primary); }

@media (max-width: 640px) {
  .chalkboard-stage { padding: var(--space-4) var(--space-4); min-height: 340px; }
  .board-slide-title { font-size: 1.5rem; }
  .board-slide-body { font-size: 0.95rem; }
}

/* ════════════════════════════════════════════════════════════
   LESSON PREV/NEXT NAV
   ════════════════════════════════════════════════════════════ */
.lesson-prev-next {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  margin: var(--space-4) 0 var(--space-3);
}
.lesson-nav-link {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-3);
  align-items: center;
  padding: var(--space-3) var(--space-4);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--text-body);
  transition: all 0.2s;
  min-height: 72px;
}
.lesson-nav-link:hover {
  border-color: var(--accent);
  background: var(--bg-elevated);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.lesson-nav-link.is-empty {
  visibility: hidden;
  pointer-events: none;
}
.lesson-nav-link i {
  font-size: 1.05rem;
  color: var(--accent);
}
.lesson-nav-prev { text-align: left; }
.lesson-nav-next {
  text-align: right;
  grid-template-columns: 1fr auto;
}
.lesson-nav-meta {
  display: block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 2px;
}
.lesson-nav-title {
  display: block;
  font-family: var(--font-head);
  font-weight: 700;
  color: var(--text-primary);
  font-size: 0.95rem;
  line-height: 1.3;
}
.lesson-nav-code {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  background: var(--accent-glow);
  color: var(--accent);
  padding: 0.1rem 0.4rem;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  margin-right: 0.5rem;
  font-weight: 700;
}
.lesson-nav-prev > span:not(.lesson-nav-meta):not(.lesson-nav-title):not(.lesson-nav-code),
.lesson-nav-prev .lesson-nav-meta,
.lesson-nav-prev .lesson-nav-title { grid-column: 2; }
.lesson-nav-next .lesson-nav-meta,
.lesson-nav-next .lesson-nav-title { grid-column: 1; }
@media (max-width: 640px) {
  .lesson-prev-next { grid-template-columns: 1fr; }
  .lesson-nav-link.is-empty { display: none; }
}

/* ════════════════════════════════════════════════════════════
   PRACTICE / FRQ TABS (crash-cram lessons)
   ════════════════════════════════════════════════════════════ */
.practice-stack, .frq-stack { margin: var(--space-4) 0; }
.practice-head { text-align: center; margin-bottom: var(--space-5); }
.practice-title {
  font-family: var(--font-head);
  font-size: clamp(1.4rem, 2.8vw, 1.8rem);
  font-weight: 800;
  color: var(--text-primary);
  margin: 0 0 var(--space-2);
}
.practice-title i { color: var(--accent); margin-right: 0.5rem; }
.practice-sub { color: var(--text-body); margin: 0; font-size: 0.95rem; }

/* FRQ stack */
.frq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-4);
  overflow: hidden;
}
.frq-item[open] { border-color: var(--accent); }
.frq-summary {
  display: flex; align-items: baseline; gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  cursor: pointer;
  list-style: none;
  min-height: var(--tap);
  border-bottom: 1px solid transparent;
}
.frq-summary::-webkit-details-marker { display: none; }
.frq-summary::after {
  content: '▾';
  margin-left: auto;
  color: var(--accent);
  transition: transform 0.2s;
}
.frq-item[open] .frq-summary::after { transform: rotate(180deg); }
.frq-item[open] .frq-summary { border-bottom-color: var(--border-subtle); }
.frq-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent);
  white-space: nowrap;
}
.frq-title {
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  flex: 1;
}
.frq-body { padding: var(--space-4) var(--space-5); }
.frq-prompt h3 {
  font-family: var(--font-head);
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0 0 var(--space-2);
  padding: 0;
  border: 0;
}
.frq-prompt-text {
  color: var(--text-body);
  line-height: 1.7;
  font-size: 1rem;
  margin-bottom: var(--space-4);
  white-space: pre-line;
}
.frq-reveal {
  margin-top: var(--space-3);
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  overflow: hidden;
}
.frq-reveal-summary {
  display: flex; align-items: center; gap: 0.5rem;
  padding: var(--space-3) var(--space-4);
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--accent);
}
.frq-reveal-summary::-webkit-details-marker { display: none; }
.frq-reveal-summary i { color: var(--accent); }
.frq-reveal[open] .frq-reveal-summary { border-bottom: 1px solid var(--border-subtle); }
.frq-rubric, .frq-solution { padding: var(--space-4) var(--space-5); }
.frq-rubric { background: rgba(34, 197, 94, 0.04); border-bottom: 1px solid var(--border-subtle); }
.frq-rubric h4, .frq-solution h4 {
  font-family: var(--font-head);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--success);
  margin: 0 0 var(--space-3);
}
.frq-solution h4 { color: var(--accent); }
.frq-rubric ul {
  list-style: none;
  padding: 0; margin: 0;
}
.frq-rubric li {
  position: relative;
  padding: var(--space-2) 0 var(--space-2) 2rem;
  color: var(--text-body);
  line-height: 1.55;
  border-bottom: 1px dashed var(--border-subtle);
}
.frq-rubric li:last-child { border-bottom: none; }
.frq-rubric li::before {
  content: '\f00c';
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
  position: absolute;
  left: 0; top: var(--space-2);
  color: var(--success);
  font-size: 0.9rem;
}
.frq-solution {
  color: var(--text-body);
  line-height: 1.7;
}
.frq-solution pre {
  background: #0d1117 !important;
  border-radius: var(--radius);
  padding: var(--space-4);
  margin: var(--space-3) 0;
  overflow-x: auto;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.86rem;
}

/* ════════════════════════════════════════════════════════════
   FLASHCARDS (Quiz me tab)
   ════════════════════════════════════════════════════════════ */
.flashcard-stack {
  position: relative;
  margin: var(--space-4) 0;
}
.flashcard-head {
  text-align: center;
  margin-bottom: var(--space-4);
}
.flashcard-title {
  font-family: var(--font-head);
  font-size: clamp(1.25rem, 2.5vw, 1.6rem);
  font-weight: 800;
  color: var(--text-primary);
  margin: 0 0 var(--space-2);
}
.flashcard-title i { color: var(--accent); margin-right: 0.5rem; }
.flashcard-sub { color: var(--text-body); margin: 0; font-size: 0.95rem; }
.flashcard {
  display: none;
  background: linear-gradient(160deg, var(--bg-surface), var(--bg-elevated));
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow);
  min-height: 280px;
  position: relative;
}
.flashcard.is-active { display: block; animation: cardFlipIn 0.3s ease; }
@keyframes cardFlipIn {
  from { opacity: 0; transform: rotateY(-8deg); }
  to   { opacity: 1; transform: rotateY(0); }
}
.flashcard-tag {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-4);
  background: var(--accent-glow);
  color: var(--accent);
}
.flashcard-tag-mustknow { background: rgba(34,197,94,0.15); color: var(--success); }
.flashcard-tag-trap, .flashcard-tag-error { background: rgba(255,123,114,0.15); color: var(--coral); }
.flashcard-tag-tip { background: var(--accent-glow); color: var(--accent); }
.flashcard-tag-example, .flashcard-tag-def { background: var(--primary-glow); color: var(--primary-light); }

.flashcard-prompt {
  font-family: var(--font-head);
  font-size: clamp(1.1rem, 2.2vw, 1.4rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-5);
  line-height: 1.35;
}
.flashcard-reveal {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.85rem 1.5rem;
  background: var(--accent);
  color: var(--text-inverse);
  border: none;
  border-radius: var(--radius);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.2s;
}
.flashcard-reveal:hover { background: var(--accent-light); transform: translateY(-1px); }
.flashcard-answer {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text-body);
}
.flashcard-answer code {
  background: rgba(13,17,23,0.6);
  color: #ffcb6b;
  padding: 0.12em 0.45em;
  border-radius: 4px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.88em;
}
.flashcard-controls {
  margin-top: var(--space-4);
  padding: var(--space-3) var(--space-4);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  display: flex; align-items: center; gap: var(--space-3);
}

/* ════════════════════════════════════════════════════════════
   LABEL LIST (cram-style **Must-know:** / **Common trap:** bullets)
   ════════════════════════════════════════════════════════════ */
.label-list {
  list-style: none !important;
  padding: 0 !important;
  margin: var(--space-3) 0 var(--space-4) !important;
  display: flex; flex-direction: column;
  gap: var(--space-2);
}
.label-row {
  display: grid;
  grid-template-columns: minmax(110px, max-content) 1fr;
  gap: var(--space-3);
  align-items: start;
  padding: var(--space-3) var(--space-4);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-left-width: 4px;
  border-left-color: var(--accent);
  border-radius: var(--radius);
  transition: border-color 0.15s;
}
.label-row:hover { border-color: var(--border-default); }
.label-chip {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  background: var(--accent-glow);
  color: var(--accent);
  white-space: nowrap;
  align-self: start;
  line-height: 1.2;
}
.label-body { color: var(--text-body); line-height: 1.6; font-size: 0.94rem; min-width: 0; }
.label-body p { margin: 0 0 var(--space-2); }
.label-body p:last-child { margin-bottom: 0; }

/* Variants */
.label-row:has(.label-mustknow) { border-left-color: var(--success); }
.label-mustknow                  { background: rgba(34, 197, 94, 0.15); color: var(--success); }
.label-row:has(.label-trap)      { border-left-color: var(--coral); }
.label-trap                      { background: rgba(255, 123, 114, 0.15); color: var(--coral); }
.label-row:has(.label-error)     { border-left-color: var(--coral); }
.label-error                     { background: rgba(255, 123, 114, 0.22); color: var(--coral); }
.label-row:has(.label-tip)       { border-left-color: var(--accent); }
.label-tip                       { background: var(--accent-glow); color: var(--accent); }
.label-row:has(.label-example)   { border-left-color: var(--primary-light); }
.label-example                   { background: var(--primary-glow); color: var(--primary-light); }
.label-row:has(.label-def)       { border-left-color: var(--primary-light); }
.label-def                       { background: var(--primary-glow); color: var(--primary-light); }
.label-default                   { background: var(--bg-elevated); color: var(--text-primary); }

@media (max-width: 640px) {
  .label-row { grid-template-columns: 1fr; }
  .label-chip { width: max-content; }
}

/* Override dark mermaid SVG font color so labels read */
.lesson-section .mermaid svg text,
.lesson-section .mermaid svg .nodeLabel,
.lesson-section .mermaid svg .edgeLabel,
.lesson-section .mermaid svg .label foreignObject div {
  color: #e8f1ff !important;
  fill: #e8f1ff !important;
  font-family: 'Nunito', 'Public Sans', sans-serif !important;
}
.lesson-section .mermaid svg .edgeLabel { background-color: transparent !important; }
.lesson-section .mermaid svg .edgeLabel rect { fill: #070e1c !important; }

/* Cap the mermaid concept-overview diagram so it never dominates the page */
.lesson-section figure {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  margin: 0 0 var(--space-5);
  max-width: 100%;
  overflow: hidden;
}
.lesson-section .mermaid {
  display: flex; justify-content: center; align-items: center;
  margin: 0 auto;
  max-width: 100%;
  background: transparent !important;
  border: 0 !important;
  padding: 0 !important;
}
.lesson-section .mermaid svg {
  max-width: 100% !important;
  max-height: 420px !important;
  height: auto !important;
  width: auto !important;
  display: block;
  margin: 0 auto;
}
@media (max-width: 640px) {
  .lesson-section .mermaid svg { max-height: 320px !important; }
}

/* Tighter list rendering inside lesson body */
.lesson-body ul { list-style: disc; }
.lesson-body ol { list-style: decimal; }
.lesson-body li { margin-bottom: var(--space-1); }
.lesson-body li > strong:first-child { color: var(--accent); }

/* Make plain "Solution Walkthrough" / "Example" headings inside lesson body pop */
.lesson-body h3 { color: var(--accent); border-left: 3px solid var(--accent); padding-left: var(--space-3); }
.lesson-body h4 { color: var(--text-primary); font-size: 1.02rem; }

/* Inline code chip — slightly tighter, more "editor-y" */
.lesson-body code {
  background: rgba(13, 17, 23, 0.6);
  color: #ffcb6b;
  border: 1px solid rgba(96, 165, 250, 0.18);
  padding: 0.12em 0.45em;
  border-radius: 4px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.88em;
  font-weight: 500;
  white-space: nowrap;
}

/* Block-level code — editor look with traffic-lights and language tag.
   Same treatment applied to summary-tab Syntax pattern card. */
.lesson-body pre,
.sum-card--code pre {
  position: relative;
  background: #0d1117 !important;
  border: 1px solid rgba(96, 165, 250, 0.18);
  border-radius: var(--radius);
  padding: 2.5rem 1.25rem 1rem !important;
  margin: var(--space-4) 0 !important;
  overflow-x: auto;
  font-family: 'JetBrains Mono', monospace !important;
  font-size: 0.86rem !important;
  line-height: 1.65 !important;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.05);
}
.lesson-body pre::before,
.sum-card--code pre::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0;
  height: 1.85rem;
  background: linear-gradient(180deg, #161b22 0%, #0d1117 100%);
  border-bottom: 1px solid rgba(96, 165, 250, 0.12);
  border-radius: var(--radius) var(--radius) 0 0;
}
.lesson-body pre::after,
.sum-card--code pre::after {
  content: '';
  position: absolute; top: 0.65rem; left: 0.85rem;
  width: 0.55rem; height: 0.55rem;
  border-radius: 50%;
  background: #ff5f57;
  box-shadow:
    0.95rem 0 0 #febc2e,
    1.9rem 0 0 #28c840;
}
.lesson-body pre code,
.sum-card--code pre code {
  background: transparent !important;
  color: #d1d5da !important;
  padding: 0 !important;
  white-space: pre;
  border: none;
}

/* Highlight.js token colors (override for dark editor look) */
.lesson-body .hljs-keyword,
.lesson-body .hljs-built_in       { color: #ff7b72; }
.lesson-body .hljs-string         { color: #a5d6ff; }
.lesson-body .hljs-number         { color: #79c0ff; }
.lesson-body .hljs-comment        { color: #8b949e; font-style: italic; }
.lesson-body .hljs-title,
.lesson-body .hljs-function       { color: #d2a8ff; }
.lesson-body .hljs-attr,
.lesson-body .hljs-variable       { color: #ffa657; }
.lesson-body .hljs-type           { color: #79c0ff; }

/* Tables inside lesson body — proper data look */
.lesson-body table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-4) 0;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  overflow: hidden;
  font-size: 0.92rem;
}
.lesson-body th {
  background: var(--bg-elevated);
  color: var(--accent);
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-head);
  font-weight: 700;
  text-align: left;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 2px solid var(--border-subtle);
}
.lesson-body td {
  padding: var(--space-3) var(--space-4);
  color: var(--text-body);
  border-top: 1px solid var(--border-subtle);
  line-height: 1.55;
}
.lesson-body tr:hover td { background: rgba(96, 165, 250, 0.04); }

/* ════════════════════════════════════════════════════════════
   INLINE CALLOUTS (Note / Hint / Warning / Definition / Key Idea / etc.)
   ════════════════════════════════════════════════════════════ */
.callout {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: var(--space-3);
  align-items: start;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: var(--space-3) var(--space-4);
  margin: var(--space-4) 0;
  max-width: 100%;
}
.callout-icon {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--accent-glow);
  color: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}
.callout-body { min-width: 0; }
.callout-label {
  font-family: var(--font-head);
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 4px;
}
.callout-body p {
  margin: 0;
  color: var(--text-body);
  line-height: 1.6;
  font-size: 0.95rem;
}
.callout-body p + p { margin-top: var(--space-2); }

/* Variants */
.callout-note {
  border-left-color: var(--primary-light);
  background: linear-gradient(180deg, rgba(96, 165, 250, 0.06), var(--bg-surface));
}
.callout-note .callout-icon { background: var(--primary-glow); color: var(--primary-light); }
.callout-note .callout-label { color: var(--primary-light); }

.callout-hint {
  border-left-color: var(--accent);
  background: linear-gradient(180deg, var(--accent-glow), var(--bg-surface));
}

.callout-warning {
  border-left-color: var(--coral);
  background: linear-gradient(180deg, rgba(255, 123, 114, 0.08), var(--bg-surface));
}
.callout-warning .callout-icon { background: rgba(255, 123, 114, 0.18); color: var(--coral); }
.callout-warning .callout-label { color: var(--coral); }

.callout-def {
  border-left-color: var(--primary-light);
  background: linear-gradient(180deg, rgba(96, 165, 250, 0.08), var(--bg-surface));
}
.callout-def .callout-icon { background: var(--primary-glow); color: var(--primary-light); }
.callout-def .callout-label { color: var(--primary-light); }

.callout-key {
  border-left-color: var(--success);
  background: linear-gradient(180deg, rgba(34, 197, 94, 0.08), var(--bg-surface));
}
.callout-key .callout-icon { background: rgba(34, 197, 94, 0.18); color: var(--success); }
.callout-key .callout-label { color: var(--success); }

.callout-mistake {
  border-left-color: var(--coral);
  background: linear-gradient(180deg, rgba(255, 123, 114, 0.10), var(--bg-surface));
}
.callout-mistake .callout-icon { background: rgba(255, 123, 114, 0.22); color: var(--coral); }
.callout-mistake .callout-label { color: var(--coral); }

.callout-analogy {
  border-left-color: #c084fc;
  background: linear-gradient(180deg, rgba(192, 132, 252, 0.08), var(--bg-surface));
}
.callout-analogy .callout-icon { background: rgba(192, 132, 252, 0.18); color: #c084fc; }
.callout-analogy .callout-label { color: #c084fc; }

.callout-conclusion {
  border-left-color: var(--success);
  background: linear-gradient(180deg, rgba(34, 197, 94, 0.10), var(--bg-surface));
}
.callout-conclusion .callout-icon { background: rgba(34, 197, 94, 0.18); color: var(--success); }
.callout-conclusion .callout-label { color: var(--success); }
.callout-conclusion p { color: var(--text-primary); font-weight: 500; }

/* Inline code inside callouts — slightly softer */
.callout code { background: rgba(0, 0, 0, 0.25) !important; }

/* Callout placed inside a list item — strip the list marker */
.li-callout { list-style: none; margin-left: -2rem; padding-left: 0; }
.li-callout .callout { margin: var(--space-2) 0; }

/* Mobile: stack icon above text */
@media (max-width: 480px) {
  .callout { grid-template-columns: 1fr; }
  .callout-icon { width: 30px; height: 30px; font-size: 0.85rem; }
}

/* ════════════════════════════════════════════════════════════
   EXAMPLE BLOCKS (Example 1: ... wrappers)
   ════════════════════════════════════════════════════════════ */
.example-block {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  margin: var(--space-5) 0;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.example-header {
  display: flex; align-items: center; gap: var(--space-3);
  background: linear-gradient(180deg, rgba(245, 158, 11, 0.14), rgba(245, 158, 11, 0.04));
  border-bottom: 1px solid var(--border-subtle);
  padding: var(--space-3) var(--space-4);
}
.example-badge {
  font-family: 'JetBrains Mono', monospace;
  background: var(--accent);
  color: var(--text-inverse);
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  flex-shrink: 0;
  text-transform: uppercase;
}
.example-title {
  flex: 1;
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 !important;
  line-height: 1.3;
  border-left: none !important;
  padding-left: 0 !important;
}
.example-body { padding: var(--space-4) var(--space-5); }
.example-body > p:first-child { margin-top: 0; }
.example-body > p:last-child { margin-bottom: 0; }
.example-body .callout { margin: var(--space-3) 0; }

/* ════════════════════════════════════════════════════════════
   STEP CARDS (1. **Verb**: ... procedural lists)
   ════════════════════════════════════════════════════════════ */
.step-list {
  list-style: none !important;
  padding: 0 !important;
  margin: var(--space-4) 0 !important;
  display: flex; flex-direction: column;
  gap: var(--space-3);
}
.step-card {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: var(--space-4);
  align-items: start;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: var(--space-3) var(--space-4);
  transition: border-color 0.2s, transform 0.2s;
}
.step-card:hover { border-color: var(--accent); transform: translateX(2px); }
.step-num {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: var(--text-inverse);
  display: flex; align-items: center; justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 800;
  font-size: 0.95rem;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.25);
  align-self: start;
  margin-top: 2px;
}
.step-content { min-width: 0; }
.step-verb {
  font-family: var(--font-head);
  font-weight: 700;
  color: var(--text-primary);
  font-size: 0.98rem;
  margin-bottom: 4px;
  line-height: 1.3;
}
.step-body {
  color: var(--text-body);
  font-size: 0.95rem;
  line-height: 1.6;
}
.step-body p { margin: 0 0 var(--space-2); }
.step-body p:last-child { margin-bottom: 0; }
.step-body code {
  background: rgba(13, 17, 23, 0.6);
  color: #ffcb6b;
  padding: 0.12em 0.45em;
  border-radius: 4px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.86em;
  border: 1px solid rgba(96, 165, 250, 0.18);
}
@media (max-width: 480px) {
  .step-card { grid-template-columns: 30px 1fr; gap: var(--space-3); padding: var(--space-3); }
  .step-num { width: 28px; height: 28px; font-size: 0.82rem; }
}

/* ════════════════════════════════════════════════════════════
   COURSE LANDING REDESIGN
   ════════════════════════════════════════════════════════════ */
.course-hero-v2 {
  position: relative;
  background:
    radial-gradient(1200px 600px at 85% -10%, rgba(245, 158, 11, 0.12), transparent 60%),
    radial-gradient(900px 500px at 10% 110%, rgba(96, 165, 250, 0.10), transparent 65%),
    linear-gradient(180deg, var(--bg-base) 0%, var(--bg-surface) 100%);
  border-bottom: 1px solid var(--border-subtle);
  padding: var(--space-7) 0 var(--space-6);
  overflow: hidden;
}
.course-hero-v2 .container { position: relative; z-index: 1; }
.course-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  align-items: center;
}
@media (min-width: 900px) {
  .course-hero-grid { grid-template-columns: 1.4fr 1fr; }
}
.course-hero-text { max-width: 720px; }
.course-hero-eyebrow {
  display: inline-flex; align-items: center; gap: 0.4rem;
  background: rgba(245, 158, 11, 0.12);
  color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem; font-weight: 700;
  padding: 0.35rem 0.85rem;
  border-radius: 9999px;
  border: 1px solid rgba(245, 158, 11, 0.3);
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
  text-transform: uppercase;
}
.course-hero-h1 {
  font-family: var(--font-head);
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  line-height: 1.1;
  font-weight: 800;
  color: var(--text-primary);
  margin: 0 0 var(--space-3);
}
.course-hero-h1 .accent { color: var(--accent); }
.course-hero-desc {
  color: var(--text-body);
  font-size: 1.1rem;
  line-height: 1.6;
  margin: 0 0 var(--space-5);
  max-width: 580px;
}
.course-stat-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}
@media (min-width: 720px) {
  .course-stat-strip { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
.course-stat {
  background: rgba(13, 26, 46, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: var(--space-3) var(--space-4);
  backdrop-filter: blur(4px);
}
.course-stat-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  font-family: var(--font-head);
  font-weight: 700;
  margin-bottom: 0.2rem;
}
.course-stat-value {
  font-family: var(--font-head);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  display: flex; align-items: baseline; gap: 0.35rem;
}
.course-stat-value i { color: var(--accent); font-size: 0.95rem; }
.course-stat-value small { font-size: 0.75rem; font-weight: 600; color: var(--text-secondary); }

.course-hero-ctas { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.course-hero-cta-primary {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: var(--accent); color: var(--text-inverse);
  padding: 0.85rem 1.5rem;
  border-radius: var(--radius);
  font-family: var(--font-head); font-weight: 700;
  text-decoration: none;
  font-size: 0.95rem;
  box-shadow: 0 8px 24px rgba(245, 158, 11, 0.25);
  transition: transform 0.2s, box-shadow 0.2s;
}
.course-hero-cta-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(245, 158, 11, 0.35);
  background: var(--accent-light);
}
.course-hero-cta-secondary {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: rgba(96, 165, 250, 0.08);
  color: var(--text-primary);
  padding: 0.85rem 1.5rem;
  border-radius: var(--radius);
  font-family: var(--font-head); font-weight: 700;
  text-decoration: none;
  font-size: 0.95rem;
  border: 1px solid var(--border-default);
  transition: all 0.2s;
}
.course-hero-cta-secondary:hover { background: var(--bg-elevated); border-color: var(--border-strong); }

/* Hero illustration — a glassy "course preview card" */
.course-hero-card {
  background: linear-gradient(160deg, rgba(13, 26, 46, 0.95) 0%, rgba(7, 14, 28, 0.9) 100%);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.4), 0 0 60px rgba(245, 158, 11, 0.08);
  position: relative;
  overflow: hidden;
}
.course-hero-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--primary-light), var(--accent));
}
.course-hero-card-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-3);
  display: flex; align-items: center; gap: 0.4rem;
}
.course-hero-card-list { display: flex; flex-direction: column; gap: var(--space-2); }
.course-hero-card-row {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  background: rgba(96, 165, 250, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  font-size: 0.88rem;
  color: var(--text-body);
}
.course-hero-card-row .num {
  font-family: 'JetBrains Mono', monospace;
  background: var(--accent-glow);
  color: var(--accent);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.78rem;
  font-weight: 700;
  flex-shrink: 0;
}
.course-hero-card-row .text { flex: 1; }
.course-hero-card-row .mins {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
}

/* Pillars (What you'll learn) */
.pillars-section {
  padding: var(--space-7) 0;
  background: var(--bg-base);
}
.pillars-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}
@media (min-width: 720px) { .pillars-grid { grid-template-columns: repeat(3, 1fr); } }
.pillar {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}
.pillar:hover { transform: translateY(-4px); border-color: var(--accent); }
.pillar-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius);
  background: var(--accent-glow);
  color: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  margin-bottom: var(--space-3);
}
.pillar-title {
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 var(--space-2);
}
.pillar-body { color: var(--text-body); font-size: 0.92rem; line-height: 1.6; margin: 0; }

/* Section heading w/ eyebrow */
.section-eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: var(--space-2);
}
.section-h2 {
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3.2vw, 2.25rem);
  font-weight: 800;
  color: var(--text-primary);
  margin: 0 0 var(--space-3);
  line-height: 1.15;
}
.section-lede {
  color: var(--text-body);
  font-size: 1.05rem;
  line-height: 1.6;
  max-width: 720px;
  margin: 0 0 var(--space-6);
}
.section-head-center { text-align: center; }
.section-head-center .section-lede { margin-left: auto; margin-right: auto; }

/* Unit Card Grid (course landing) */
.unit-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}
@media (min-width: 800px) { .unit-grid { grid-template-columns: repeat(2, 1fr); } }
.unit-card-v2 {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: all 0.3s;
  display: flex; flex-direction: column; gap: var(--space-3);
  position: relative;
  overflow: hidden;
}
.unit-card-v2:hover { transform: translateY(-3px); border-color: var(--accent); box-shadow: var(--shadow); }
.unit-card-v2::before {
  content: '';
  position: absolute; top: 0; left: 0; bottom: 0;
  width: 4px;
  background: var(--accent);
  opacity: 0.6;
  transition: opacity 0.3s;
}
.unit-card-v2:hover::before { opacity: 1; }
.unit-card-head { display: flex; align-items: center; gap: var(--space-3); }
.unit-card-num {
  font-family: 'JetBrains Mono', monospace;
  background: var(--accent);
  color: var(--text-inverse);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}
.unit-card-title {
  flex: 1;
  font-family: var(--font-head);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  line-height: 1.3;
}
.unit-card-meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-2);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
}
.unit-card-meta-item {
  background: rgba(96, 165, 250, 0.05);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-3);
  text-align: center;
}
.unit-card-meta-label {
  display: block;
  color: var(--text-secondary);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 2px;
  font-weight: 600;
}
.unit-card-meta-value { color: var(--text-primary); font-weight: 700; font-size: 0.88rem; }
.unit-card-meta-value.accent { color: var(--accent); }

/* Exam weight bar */
.weight-bar {
  height: 6px;
  background: rgba(96, 165, 250, 0.12);
  border-radius: 9999px;
  overflow: hidden;
  position: relative;
}
.weight-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  border-radius: 9999px;
  transition: width 0.5s ease;
}
.weight-bar-label {
  display: flex; justify-content: space-between;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: var(--text-secondary);
  margin-bottom: 4px;
}
.weight-bar-label strong { color: var(--accent); font-weight: 700; }

/* Lesson peek inside unit card */
.unit-card-lessons {
  border-top: 1px dashed var(--border-subtle);
  padding-top: var(--space-3);
  margin-top: var(--space-1);
}
.unit-card-lesson-row {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-2) 0;
  font-size: 0.88rem;
  border-bottom: 1px solid rgba(96, 165, 250, 0.06);
  text-decoration: none;
  color: var(--text-body);
  transition: color 0.15s;
}
.unit-card-lesson-row:last-child { border-bottom: none; }
.unit-card-lesson-row:hover { color: var(--accent); }
.unit-card-lesson-code {
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent);
  font-weight: 700;
  font-size: 0.78rem;
  min-width: 32px;
}
.unit-card-lesson-title { flex: 1; line-height: 1.4; }
.unit-card-lesson-min {
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
}
.unit-card-toggle {
  background: none;
  border: none;
  color: var(--accent);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.88rem;
  padding: var(--space-2) 0 0;
  cursor: pointer;
  display: inline-flex; align-items: center; gap: 0.35rem;
  text-decoration: none;
}
.unit-card-toggle:hover { color: var(--accent-light); }
.unit-card-toggle .chev { transition: transform 0.2s; }
.unit-card-toggle[aria-expanded="true"] .chev { transform: rotate(90deg); }
.unit-card-lessons.collapsed .unit-card-lesson-row:nth-child(n+4) { display: none; }

/* Dual CTA — Crash + Mock */
.cta-duo {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}
@media (min-width: 720px) { .cta-duo { grid-template-columns: 1fr 1fr; } }
.cta-card {
  position: relative;
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  overflow: hidden;
  text-decoration: none;
  display: flex; flex-direction: column; gap: var(--space-3);
  min-height: 220px;
  transition: transform 0.3s;
}
.cta-card:hover { transform: translateY(-4px); }
.cta-card-crash {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.18), rgba(245, 158, 11, 0.04));
  border: 1px solid rgba(245, 158, 11, 0.45);
}
.cta-card-mock {
  background: linear-gradient(135deg, rgba(96, 165, 250, 0.18), rgba(96, 165, 250, 0.04));
  border: 1px solid rgba(96, 165, 250, 0.45);
}
.cta-card-icon {
  width: 56px; height: 56px;
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
}
.cta-card-crash .cta-card-icon { background: rgba(245, 158, 11, 0.2); color: var(--accent); }
.cta-card-mock .cta-card-icon { background: rgba(96, 165, 250, 0.2); color: var(--primary-light); }
.cta-card-title {
  font-family: var(--font-head);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 0;
}
.cta-card-desc { color: var(--text-body); font-size: 0.95rem; line-height: 1.55; margin: 0; flex: 1; }
.cta-card-arrow {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.95rem;
  display: inline-flex; align-items: center; gap: 0.4rem;
  margin-top: auto;
}
.cta-card-crash .cta-card-arrow { color: var(--accent); }
.cta-card-mock .cta-card-arrow { color: var(--primary-light); }

/* FAQ Accordion */
.faq-list { display: flex; flex-direction: column; gap: var(--space-3); max-width: 820px; margin: 0 auto; }
.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.2s;
}
.faq-item[open] { border-color: var(--accent); }
.faq-item summary {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  cursor: pointer;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-primary);
  list-style: none;
  min-height: var(--tap);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  color: var(--accent);
  font-size: 1.4rem;
  font-weight: 400;
  transition: transform 0.2s;
}
.faq-item[open] summary::after { content: '−'; }
.faq-answer {
  padding: 0 var(--space-5) var(--space-4);
  color: var(--text-body);
  line-height: 1.65;
  font-size: 0.95rem;
}

/* Hide the old course-tabs strip if v2 hero is present */
.course-hero-v2 ~ .course-body .course-tabs { display: none; }

/* ════════════════════════════════════════════════════════════
   AP INDEX REDESIGN
   ════════════════════════════════════════════════════════════ */
.ap-domain-block { margin-bottom: var(--space-7); }
.ap-domain-head {
  display: flex; align-items: center; gap: var(--space-3);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--border-subtle);
}
.ap-domain-icon {
  width: 44px; height: 44px;
  border-radius: var(--radius);
  background: var(--accent-glow);
  color: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}
.ap-domain-title {
  font-family: var(--font-head);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 0;
}
.ap-domain-count {
  margin-left: auto;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  color: var(--text-secondary);
  background: var(--bg-elevated);
  padding: 0.25rem 0.65rem;
  border-radius: 9999px;
}

.ap-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}
@media (min-width: 640px) { .ap-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .ap-grid { grid-template-columns: repeat(3, 1fr); } }

.ap-card {
  position: relative;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  text-decoration: none;
  transition: all 0.25s;
  display: flex; flex-direction: column; gap: var(--space-3);
  overflow: hidden;
  min-height: 200px;
}
.ap-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: var(--shadow);
}
.ap-card:hover::after {
  opacity: 1;
  transform: translateX(0);
}
.ap-card::after {
  content: '→';
  position: absolute;
  bottom: var(--space-4); right: var(--space-5);
  color: var(--accent);
  font-size: 1.3rem;
  font-weight: 700;
  opacity: 0;
  transform: translateX(-6px);
  transition: all 0.25s;
}
.ap-card-icon {
  width: 38px; height: 38px;
  border-radius: var(--radius-sm);
  background: var(--accent-glow);
  color: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
}
.ap-card-title {
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  line-height: 1.25;
}
.ap-card-desc {
  color: var(--text-body);
  font-size: 0.88rem;
  line-height: 1.5;
  margin: 0;
  flex: 1;
}
.ap-card-stats {
  display: flex; align-items: center; gap: var(--space-3);
  font-size: 0.78rem;
  margin-top: auto;
  padding-top: var(--space-2);
  border-top: 1px dashed var(--border-subtle);
  font-family: 'JetBrains Mono', monospace;
}
.ap-card-stats-item {
  display: inline-flex; align-items: center; gap: 0.3rem;
  color: var(--text-secondary);
}
.ap-card-stats-item i { color: var(--accent); }
.ap-card-stats-item.live { color: var(--success); }
.ap-card-stats-item.live i { color: var(--success); }
.ap-card.is-soon { opacity: 0.6; }
.ap-card.is-soon::after { display: none; }
.ap-card.is-soon:hover { transform: none; cursor: default; }

/* ════════════════════════════════════════════════════════════
   HOME PAGE REDESIGN (problem, comparison, features, audience, etc.)
   ════════════════════════════════════════════════════════════ */
.home-hero {
  position: relative;
  padding: var(--space-7) 0 var(--space-6);
  background:
    radial-gradient(1400px 700px at 80% 0%, rgba(245, 158, 11, 0.10), transparent 55%),
    radial-gradient(1000px 500px at 0% 100%, rgba(96, 165, 250, 0.12), transparent 60%),
    var(--bg-base);
  overflow: hidden;
}
.home-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  align-items: center;
}
@media (min-width: 960px) { .home-hero-grid { grid-template-columns: 1.2fr 1fr; } }
.home-hero-h1 {
  font-family: var(--font-head);
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  line-height: 1.05;
  font-weight: 900;
  color: var(--text-primary);
  margin: var(--space-3) 0;
  letter-spacing: -0.02em;
}
.home-hero-h1 .accent { color: var(--accent); }
.home-hero-h1 .grad {
  background: linear-gradient(135deg, var(--accent), #fcd34d);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.home-hero-desc {
  color: var(--text-body);
  font-size: 1.15rem;
  line-height: 1.55;
  max-width: 580px;
  margin: 0 0 var(--space-5);
}
.home-hero-trust {
  display: flex; flex-wrap: wrap; gap: var(--space-3);
  margin-top: var(--space-4);
  color: var(--text-secondary);
  font-size: 0.85rem;
}
.home-hero-trust i { color: var(--success); margin-right: 0.3rem; }

/* Hero illustration (right side) — a stacked-cards device mockup */
.home-hero-illus {
  position: relative;
  min-height: 380px;
  perspective: 1000px;
}
.home-hero-card-stack {
  position: relative;
  transform: rotate(-2deg);
}
.home-hero-card-stack .card-stack-item {
  background: linear-gradient(160deg, var(--bg-surface), var(--bg-elevated));
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
  margin-bottom: var(--space-3);
  position: relative;
  overflow: hidden;
}
.home-hero-card-stack .card-stack-item::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--primary-light));
}
.card-stack-item-1 {
  transform: translateX(-12px);
  background: linear-gradient(160deg, rgba(245, 158, 11, 0.12), var(--bg-elevated)) !important;
}
.card-stack-item-2 { transform: translateX(8px); }
.card-stack-item-3 {
  transform: translateX(-4px);
  background: linear-gradient(160deg, rgba(96, 165, 250, 0.10), var(--bg-elevated)) !important;
}
.card-stack-eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.4rem;
}
.card-stack-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-primary);
  margin: 0 0 var(--space-2);
}
.card-stack-meta {
  display: flex; gap: var(--space-3);
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-family: 'JetBrains Mono', monospace;
}
.card-stack-meta i { color: var(--accent); margin-right: 0.25rem; }
.card-stack-bar {
  height: 5px; background: rgba(96, 165, 250, 0.12); border-radius: 9999px;
  margin-top: var(--space-2); overflow: hidden;
}
.card-stack-bar::after {
  content: '';
  display: block; height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  width: 64%;
}

/* Problem section */
.problem-section { padding: var(--space-7) 0; background: var(--bg-elevated); }
.problem-grid {
  display: grid; grid-template-columns: 1fr; gap: var(--space-4);
}
@media (min-width: 720px) { .problem-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .problem-grid { grid-template-columns: repeat(4, 1fr); } }
.problem-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-left: 4px solid var(--coral);
  border-radius: var(--radius);
  padding: var(--space-4);
}
.problem-icon {
  font-size: 1.6rem;
  color: var(--coral);
  margin-bottom: var(--space-2);
}
.problem-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-primary);
  margin: 0 0 var(--space-2);
}
.problem-body { color: var(--text-body); font-size: 0.88rem; line-height: 1.55; margin: 0; }

/* Comparison table */
.compare-section { padding: var(--space-7) 0; }
.compare-table-wrap { overflow-x: auto; border-radius: var(--radius-lg); border: 1px solid var(--border-subtle); }
.compare-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-surface);
  font-size: 0.92rem;
  min-width: 640px;
}
.compare-table th {
  background: var(--bg-elevated);
  font-family: var(--font-head);
  font-weight: 700;
  color: var(--text-primary);
  padding: var(--space-4);
  text-align: left;
  border-bottom: 2px solid var(--border-subtle);
}
.compare-table th.col-shrutam {
  background: linear-gradient(180deg, rgba(245, 158, 11, 0.18), var(--bg-elevated));
  color: var(--accent);
}
.compare-table td {
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--border-subtle);
  color: var(--text-body);
}
.compare-table td.feature {
  font-family: var(--font-head);
  font-weight: 700;
  color: var(--text-primary);
}
.compare-table td.col-shrutam {
  background: rgba(245, 158, 11, 0.06);
  color: var(--text-primary);
  font-weight: 600;
}
.compare-table .ok-icon  { color: var(--success); }
.compare-table .no-icon  { color: var(--coral); }
.compare-table .partial-icon { color: var(--accent); }

/* Feature grid */
.feature-grid {
  display: grid; grid-template-columns: 1fr; gap: var(--space-4);
}
@media (min-width: 640px) { .feature-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .feature-grid { grid-template-columns: repeat(3, 1fr); } }
.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: all 0.3s;
}
.feature-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-default);
  box-shadow: var(--shadow);
}
.feature-icon-bg {
  display: inline-flex; align-items: center; justify-content: center;
  width: 52px; height: 52px;
  border-radius: var(--radius);
  background: var(--accent-glow);
  color: var(--accent);
  font-size: 1.35rem;
  margin-bottom: var(--space-3);
}
.feature-card.color-blue .feature-icon-bg { background: var(--primary-glow); color: var(--primary-light); }
.feature-card.color-green .feature-icon-bg { background: rgba(34, 197, 94, 0.12); color: var(--success); }
.feature-card.color-coral .feature-icon-bg { background: rgba(255, 123, 114, 0.12); color: var(--coral); }
.feature-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-primary);
  margin: 0 0 var(--space-2);
}
.feature-body { color: var(--text-body); font-size: 0.92rem; line-height: 1.6; margin: 0; }

/* Audience cards */
.audience-grid {
  display: grid; grid-template-columns: 1fr; gap: var(--space-4);
}
@media (min-width: 720px) { .audience-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .audience-grid { grid-template-columns: repeat(4, 1fr); } }
.audience-card {
  background: linear-gradient(160deg, var(--bg-surface), var(--bg-elevated));
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  text-align: center;
  transition: all 0.3s;
}
.audience-card:hover { transform: translateY(-3px); border-color: var(--accent); }
.audience-emoji {
  font-size: 2.5rem;
  margin-bottom: var(--space-2);
  display: block;
  line-height: 1;
}
.audience-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-primary);
  margin: 0 0 var(--space-2);
}
.audience-body { color: var(--text-body); font-size: 0.88rem; line-height: 1.55; margin: 0; }

/* Testimonials */
.testi-grid {
  display: grid; grid-template-columns: 1fr; gap: var(--space-4);
}
@media (min-width: 720px) { .testi-grid { grid-template-columns: repeat(3, 1fr); } }
.testi-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  position: relative;
}
.testi-card::before {
  content: '\201C';
  position: absolute; top: -8px; left: var(--space-4);
  font-family: Georgia, serif;
  font-size: 4rem;
  color: var(--accent);
  line-height: 1;
  opacity: 0.6;
}
.testi-quote {
  color: var(--text-body);
  font-size: 0.95rem;
  line-height: 1.6;
  margin: var(--space-3) 0;
  font-style: italic;
}
.testi-attribution {
  display: flex; align-items: center; gap: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--border-subtle);
}
.testi-avatar {
  width: 38px; height: 38px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--primary-light));
  display: flex; align-items: center; justify-content: center;
  color: var(--text-inverse);
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 0.95rem;
}
.testi-meta { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.3; }
.testi-meta strong { color: var(--text-primary); display: block; }

/* Outcome path (zero → AP 5) */
.outcome-path {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  padding: var(--space-4) 0;
}
@media (min-width: 720px) { .outcome-path { grid-template-columns: repeat(4, 1fr); position: relative; } }
.outcome-path::before {
  content: '';
  position: absolute; top: 50%; left: 5%; right: 5%;
  height: 2px;
  background: linear-gradient(90deg, var(--coral), var(--accent), var(--success));
  z-index: 0;
  display: none;
}
@media (min-width: 720px) { .outcome-path::before { display: block; } }
.outcome-step {
  position: relative;
  z-index: 1;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  text-align: center;
}
.outcome-step-num {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: var(--text-inverse);
  font-family: 'JetBrains Mono', monospace;
  font-weight: 800;
  font-size: 0.95rem;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto var(--space-3);
}
.outcome-step-title {
  font-family: var(--font-head);
  font-weight: 700;
  color: var(--text-primary);
  font-size: 1rem;
  margin: 0 0 var(--space-1);
}
.outcome-step-body { color: var(--text-body); font-size: 0.85rem; line-height: 1.5; margin: 0; }

/* Big final CTA */
.final-cta-section { padding: var(--space-7) 0; }
.final-cta {
  background:
    radial-gradient(800px 400px at 50% 0%, rgba(245, 158, 11, 0.18), transparent 60%),
    linear-gradient(160deg, var(--bg-surface), var(--bg-elevated));
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  padding: var(--space-7) var(--space-5);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.final-cta::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(600px 300px at 50% 100%, rgba(96, 165, 250, 0.12), transparent);
  pointer-events: none;
}
.final-cta-h2 {
  font-family: var(--font-head);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  color: var(--text-primary);
  margin: 0 0 var(--space-3);
  line-height: 1.15;
}
.final-cta-desc {
  color: var(--text-body);
  font-size: 1.05rem;
  line-height: 1.55;
  margin: 0 auto var(--space-5);
  max-width: 580px;
}
.final-cta-btns { display: inline-flex; flex-wrap: wrap; gap: var(--space-3); justify-content: center; }

/* ════════════════════════════════════════════════════════════
   PRINT
   ════════════════════════════════════════════════════════════ */
@media print {
  .nav, .site-footer, .audio-bar-sticky, .mcq-reveal-btn,
  .bookmark-btn, .no-print, .block-tts, .shr-breadcrumb,
  .mock-timer-bar, .cram-controls, .cram-footer { display: none !important; }
  body, .cram-page { background: #fff !important; color: #000 !important; font-size: 11pt; }
  .cram-paper { background: #fff !important; border: none !important; box-shadow: none !important; padding: 0 !important; }
  .lesson-body, .lesson-body *, .cram-tldr, .cram-header h1, .cram-url, .cram-section-h { color: #000 !important; background: transparent !important; }
  .lesson-body h2, .lesson-body h3 { page-break-after: avoid; }
  .lesson-body pre, .lesson-body table { page-break-inside: avoid; }
  @page { margin: 0.5in; }
}

/* ════════════════════════════════════════════════════════════
   A11Y — WCAG AA contrast fixes (Lighthouse audit findings)
   ════════════════════════════════════════════════════════════
   Default navy theme had --text-muted: #4a6a8a → 3.08:1 on bg-surface,
   failing WCAG AA (needs 4.5:1 for normal text). Lifting to #7e9ec0
   brings contrast to ~4.7:1 on #0d1a2e. Same lift applied to the dark
   forest and gaming themes so all dark themes pass AA.
   */
:root,
[data-theme="navy"] {
  --text-muted: #7e9ec0;
}
[data-theme="forest"] {
  --text-muted: #6dc99a;
}
[data-theme="gaming"] {
  --text-muted: #b87ce0;
}
/* bright theme already passes (#94a3b8 on near-white = 4.6:1) */

/* ────────────────────────────────────────────────────────────
   Link visibility — Lighthouse "link-in-text-block" was failing
   because saffron/accent links inside body prose had < 3:1 contrast
   against surrounding text AND no underline. Adding an underline to
   inline content links so they're distinguishable independent of color.
   ──────────────────────────────────────────────────────────── */
p a, li a, small a, dd a, blockquote a, .lesson-body a,
nav.trust-strip a, .nav .trust-strip a {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
/* But NOT for buttons/cards/tabs/etc styled as anchors */
a.btn, a.card, a.tab, a.ap-card, a.cta-card,
a.flashcard-reveal, a.course-hero-cta-primary, a.course-hero-cta-secondary,
a.mcq-nav-btn, a.lesson-nav-link, a.cb-btn,
.tabs a, .nav nav a, .footer-nav a,
footer ul a {
  text-decoration: none;
}
/* Restore hover-underline on those nav-style anchors */
footer ul a:hover, .footer-nav a:hover { text-decoration: underline; }