/* ============================================================
   AI Capability OS — Courses Discovery Page
   Design System: Capability Ledger + Neomorphism
   Dark Neomorphism: dual shadow (dark bottom-right + indigo top-left)
   ============================================================ */

:root {
  --bg: #0b1020;
  --surface: #11182a;
  --surface-raised: #172139;
  --surface-strong: #1d2944;
  --border: rgba(167, 181, 211, 0.22);
  --edge: rgba(167, 181, 211, 0.1);
  --fg: #f6f3e8;
  --fg-muted: #a8b2c7;
  --accent: #91a0ff;
  --accent-strong: #586ee8;
  --on-accent: #ffffff;
  --success: #58d7aa;
  --warning: #f2bd66;
  --danger: #ff7b83;
  --info: #7bc7ff;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.22);
  --shadow-md: 0 8px 28px rgba(0,0,0,0.24);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.32);
  --glow: 0 8px 24px rgba(88,110,232,0.28);

  --neo-shadow-dark: rgba(0,0,0,0.48);
  --neo-shadow-light: rgba(88,110,232,0.09);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --font-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --font-mono: "SFMono-Regular", "Cascadia Code", "Roboto Mono", Consolas, monospace;

  --touch-min: 44px;
  --header-h: 60px;
  --ease-soft: cubic-bezier(0.22,0.61,0.36,1);
  --dur-micro: 150ms;
  --container: 1200px;

  color-scheme: dark;
}

[data-theme="light"] {
  --bg: #f4f4ef;
  --surface: #fffefa;
  --surface-raised: #ffffff;
  --surface-strong: #e9edf7;
  --border: rgba(36,59,143,0.2);
  --edge: rgba(36,59,143,0.1);
  --fg: #161d2f;
  --fg-muted: #5f687b;
  --accent: #334fc2;
  --accent-strong: #243b8f;
  --success: #167a58;
  --warning: #8b5c08;
  --danger: #b4232d;
  --info: #176b99;
  --neo-shadow-dark: rgba(180,185,210,0.5);
  --neo-shadow-light: rgba(255,255,255,0.9);
  color-scheme: light;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f4f4ef;
    --surface: #fffefa;
    --surface-raised: #ffffff;
    --surface-strong: #e9edf7;
    --border: rgba(36,59,143,0.2);
    --edge: rgba(36,59,143,0.1);
    --fg: #161d2f;
    --fg-muted: #5f687b;
    --accent: #334fc2;
    --accent-strong: #243b8f;
    --success: #167a58;
    --warning: #8b5c08;
    --danger: #b4232d;
    --info: #176b99;
    --neo-shadow-dark: rgba(180,185,210,0.5);
    --neo-shadow-light: rgba(255,255,255,0.9);
    color-scheme: light;
  }
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    radial-gradient(circle at 20% 10%, rgba(88,110,232,0.14), transparent 45%),
    radial-gradient(circle at 80% 0%, rgba(88,110,232,0.08), transparent 40%);
  pointer-events: none;
}
h1,h2,h3,h4,p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }
button { font-family: inherit; cursor: pointer; }
a { color: inherit; text-decoration: none; }
:where(button,a,input,[tabindex]):focus-visible {
  outline: 3px solid color-mix(in oklab, var(--accent) 78%, white);
  outline-offset: 2px;
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

.skip-link {
  position: fixed; top: -60px; left: 12px; z-index: 1000;
  background: var(--accent-strong); color: #fff;
  padding: 10px 16px; border-radius: var(--radius-sm);
  font-weight: 700; font-size: 13px;
  transition: top var(--dur-micro) var(--ease-soft);
}
.skip-link:focus { top: 12px; }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---- Header ---- */
.site-header {
  position: sticky; top: 0; z-index: 200;
  height: var(--header-h);
  background: color-mix(in oklab, var(--bg) 82%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-micro), box-shadow var(--dur-micro);
}
.site-header.is-scrolled { border-bottom-color: var(--border); box-shadow: var(--shadow-sm); }
.header-inner {
  max-width: var(--container); margin: 0 auto;
  height: 100%; padding: 0 16px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.brand {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 800; font-size: 15px;
}
.brand-mark { color: var(--accent); font-size: 18px; }
.primary-nav { display: none; gap: 22px; }
.primary-nav a {
  font-size: 13px; font-weight: 600; color: var(--fg-muted);
}
.primary-nav a:hover { color: var(--fg); }
.primary-nav a.current { color: var(--accent); }
.header-actions { display: flex; align-items: center; gap: 8px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: var(--touch-min); padding: 0 20px;
  border-radius: var(--radius-sm); border: 1px solid transparent;
  font-size: 14px; font-weight: 700;
  transition: transform var(--dur-micro) var(--ease-soft), filter var(--dur-micro);
}
.btn:active { transform: scale(0.97); }
.btn-primary {
  background: linear-gradient(135deg, var(--accent-strong), var(--accent));
  color: #fff; box-shadow: var(--glow);
}
.btn-primary:hover { filter: brightness(1.08); }
.btn-ghost {
  background: var(--surface-raised); border-color: var(--border); color: var(--fg);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-sm { min-height: 36px; padding: 0 14px; font-size: 13px; }
.icon-btn {
  width: 40px; height: 40px; min-width: 40px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm); border: 1px solid var(--border);
  background: var(--surface-raised); color: var(--fg); font-size: 16px;
}
.icon-btn:hover { border-color: var(--accent); }
.nav-toggle {
  width: 40px; height: 40px;
  border-radius: var(--radius-sm); border: 1px solid var(--border);
  background: var(--surface-raised); color: var(--fg); font-size: 18px;
}
.mobile-nav {
  position: fixed; inset: var(--header-h) 0 0 0; z-index: 190;
  background: var(--bg); padding: 20px; overflow-y: auto;
}
.mobile-nav[hidden] { display: none; }
.mobile-nav a {
  display: block; padding: 14px 4px; font-size: 16px; font-weight: 700;
  color: var(--fg); border-bottom: 1px solid var(--border);
}
.mobile-nav .btn { margin-top: 20px; width: 100%; }
.header-actions .btn-primary { display: none; }

/* ---- Hero ---- */
.courses-hero {
  padding: 52px 0 44px;
  border-bottom: 1px solid var(--border);
}
.courses-hero-inner {
  max-width: var(--container); margin: 0 auto; padding: 0 20px;
  display: flex; flex-direction: column; gap: 16px;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 11px; font-weight: 800; letter-spacing: 0.02em;
  color: var(--accent); background: rgba(145,160,255,0.12);
  border: 1px solid rgba(145,160,255,0.25);
  padding: 5px 12px; border-radius: 999px;
  width: fit-content;
}
.courses-hero h1 {
  font-size: clamp(26px, 5vw, 40px);
  font-weight: 800; line-height: 1.25; letter-spacing: -0.01em;
}
.accent-text {
  background: linear-gradient(135deg, var(--accent), var(--info));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.courses-hero-sub {
  font-size: 15px; color: var(--fg-muted); line-height: 1.65; max-width: 60ch;
}
.courses-hero-stats {
  display: flex; flex-wrap: wrap; gap: 16px; margin-top: 4px;
}
.ch-stat {
  display: flex; flex-direction: column; gap: 2px;
}
.ch-stat-num {
  font-size: 22px; font-weight: 800; color: var(--accent);
}
.ch-stat-label { font-size: 11px; color: var(--fg-muted); }

/* ---- Domain tabs (Neo) ---- */
.courses-main { padding: 40px 0 80px; }

.neo-domain-tabs {
  display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 32px;
}
.neo-tab {
  background: linear-gradient(145deg, var(--surface-raised), var(--surface));
  box-shadow:
    4px 4px 10px var(--neo-shadow-dark),
    -3px -3px 8px var(--neo-shadow-light);
  border: 1px solid rgba(167,181,211,0.08);
  border-radius: 999px;
  padding: 9px 20px;
  font-size: 13px; font-weight: 700;
  color: var(--fg-muted);
  transition: all 0.25s var(--ease-soft);
  min-height: 42px;
  white-space: nowrap;
}
.neo-tab:hover {
  color: var(--fg);
  box-shadow:
    5px 5px 12px var(--neo-shadow-dark),
    -4px -4px 10px var(--neo-shadow-light);
}
.neo-tab.active {
  color: var(--accent);
  background: linear-gradient(145deg, rgba(88,110,232,0.2), rgba(145,160,255,0.1));
  border-color: rgba(145,160,255,0.3);
  box-shadow:
    inset 3px 3px 8px rgba(0,0,0,0.3),
    inset -2px -2px 6px rgba(88,110,232,0.12);
}
[data-theme="light"] .neo-tab {
  background: linear-gradient(145deg, #ffffff, #f4f4ef);
}
[data-theme="light"] .neo-tab.active {
  background: linear-gradient(145deg, rgba(51,79,194,0.12), rgba(51,79,194,0.06));
  border-color: rgba(51,79,194,0.3);
}

/* ---- Level filter pills ---- */
.neo-level-filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.level-pill {
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 11.5px;
  font-weight: 700;
  color: var(--fg-muted);
  cursor: pointer;
  transition: all 0.2s var(--ease-soft);
}
.level-pill:hover {
  color: var(--fg);
  border-color: var(--accent);
}
.level-pill.active {
  color: var(--accent);
  background: rgba(145, 160, 255, 0.12);
  border-color: var(--accent);
  box-shadow: 0 0 10px rgba(145, 160, 255, 0.2);
}

/* ---- Course grid ---- */
.neo-courses-grid {
  display: grid;
  gap: 22px;
  grid-template-columns: 1fr;
}

/* ---- Neo Course Card ---- */
.neo-course-card {
  background: var(--surface);
  border-radius: var(--radius-xl);
  box-shadow:
    7px 7px 18px var(--neo-shadow-dark),
    -4px -4px 12px var(--neo-shadow-light);
  border: 1px solid rgba(167,181,211,0.07);
  padding: 24px;
  display: flex; flex-direction: column; gap: 14px;
  transition: all 0.35s var(--ease-soft);
  position: relative; overflow: hidden;
  cursor: default;
}
.neo-course-card::before {
  content: '';
  position: absolute; top: 0; right: 0;
  width: 120px; height: 120px;
  background: radial-gradient(ellipse at top right, var(--domain-glow, rgba(88,110,232,0.1)), transparent 70%);
  pointer-events: none;
  transition: opacity 0.4s ease;
  opacity: 0.7;
}
.neo-course-card:hover {
  transform: translateY(-5px);
  box-shadow:
    10px 10px 24px var(--neo-shadow-dark),
    -5px -5px 14px var(--neo-shadow-light),
    0 0 40px rgba(145,160,255,0.06);
}
.neo-course-card:hover::before { opacity: 1; }

/* Domain color tokens */
.neo-course-card[data-domain="python"]      { --domain-glow: rgba(55,118,171,0.18); --domain-accent: #6ab4f5; }
.neo-course-card[data-domain="calculus"]    { --domain-glow: rgba(242,140,60,0.14);  --domain-accent: #f5b56a; }
.neo-course-card[data-domain="distributed"] { --domain-glow: rgba(0,180,216,0.14);  --domain-accent: #7bc7ff; }
.neo-course-card[data-domain="datastruct"]  { --domain-glow: rgba(6,214,160,0.14);  --domain-accent: #58d7aa; }
.neo-course-card[data-domain="ml"]          { --domain-glow: rgba(157,78,221,0.14); --domain-accent: #c084fc; }
.neo-course-card[data-domain="network"]     { --domain-glow: rgba(230,57,70,0.14);  --domain-accent: #ff7b83; }

[data-theme="light"] .neo-course-card {
  background: var(--surface);
  box-shadow:
    7px 7px 18px var(--neo-shadow-dark),
    -4px -4px 12px var(--neo-shadow-light);
}

.ncc-top-row {
  display: flex; align-items: center; justify-content: space-between;
}
.ncc-domain-badge {
  font-size: 10px; font-weight: 800;
  color: var(--domain-accent, var(--accent));
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  padding: 4px 10px; border-radius: 999px;
}
[data-theme="light"] .ncc-domain-badge {
  background: rgba(0,0,0,0.04);
  border-color: rgba(0,0,0,0.08);
}
.ncc-format-badge {
  font-size: 10px; font-weight: 800;
  background: var(--surface-raised); border: 1px solid var(--border);
  padding: 3px 9px; border-radius: var(--radius-sm); color: var(--fg-muted);
}

.neo-course-card h3 {
  font-size: 16px; font-weight: 800; line-height: 1.4;
}
.ncc-desc {
  font-size: 12.5px; color: var(--fg-muted); line-height: 1.6; flex: 1;
}
.ncc-concepts {
  display: flex; gap: 6px; flex-wrap: wrap;
}
.ncc-concept {
  font-size: 10.5px; padding: 3px 9px; border-radius: 999px;
  background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08);
  color: var(--fg-muted);
}
[data-theme="light"] .ncc-concept {
  background: rgba(0,0,0,0.03); border-color: rgba(0,0,0,0.07);
}

.ncc-footer {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 14px; border-top: 1px solid rgba(167,181,211,0.08);
  flex-wrap: wrap; gap: 10px;
}
.ncc-meta { display: flex; align-items: center; gap: 12px; }
.ncc-duration { font-size: 11px; color: var(--fg-muted); font-weight: 700; }

/* Neo launch button */
.ncc-launch {
  background: linear-gradient(145deg, var(--surface-raised), var(--surface));
  box-shadow:
    3px 3px 8px rgba(0,0,0,0.4),
    -2px -2px 6px var(--neo-shadow-light);
  border: 1px solid rgba(167,181,211,0.1);
  border-radius: var(--radius-md);
  color: var(--domain-accent, var(--accent));
  font-size: 12px; font-weight: 800;
  padding: 9px 18px; min-height: 40px;
  display: inline-flex; align-items: center; gap: 7px;
  transition: all 0.2s var(--ease-soft);
}
.ncc-launch:hover {
  box-shadow:
    4px 4px 12px rgba(0,0,0,0.5),
    -3px -3px 8px var(--neo-shadow-light),
    0 0 20px rgba(145,160,255,0.08);
  color: var(--fg);
  transform: translateY(-1px);
}
.ncc-launch:active {
  box-shadow:
    inset 3px 3px 8px rgba(0,0,0,0.4),
    inset -2px -2px 6px var(--neo-shadow-light);
  transform: scale(0.97);
}
[data-theme="light"] .ncc-launch {
  background: linear-gradient(145deg, #ffffff, #f4f4ef);
  box-shadow:
    3px 3px 8px rgba(180,185,210,0.45),
    -2px -2px 6px rgba(255,255,255,0.9);
}

/* Progress indicator on card */
.ncc-progress-wrap {
  display: flex; align-items: center; gap: 8px;
}
.ncc-progress-bar {
  flex: 1; height: 3px; background: var(--border); border-radius: 99px; overflow: hidden;
}
.ncc-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--domain-accent, var(--accent-strong)), var(--accent));
  border-radius: 99px;
  transition: width 0.6s var(--ease-soft);
}
.ncc-progress-label { font-size: 10px; color: var(--fg-muted); white-space: nowrap; }

/* ---- Course Count Banner ---- */
.courses-count-bar {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 20px; gap: 10px; flex-wrap: wrap;
}
.courses-count-text {
  font-size: 13px; color: var(--fg-muted); font-weight: 700;
}
.courses-count-text strong { color: var(--fg); }

/* ---- Search Bar (Neo inset) ---- */
.neo-search-wrap {
  position: relative; max-width: 340px; width: 100%;
}
.neo-search {
  width: 100%; min-height: 42px; padding: 0 14px 0 38px;
  background: var(--surface);
  box-shadow:
    inset 3px 3px 8px rgba(0,0,0,0.35),
    inset -2px -2px 6px var(--neo-shadow-light);
  border: 1px solid rgba(167,181,211,0.08);
  border-radius: 999px;
  color: var(--fg); font-size: 13px; font-family: var(--font-sans);
  outline: none;
  transition: box-shadow 0.2s ease;
}
.neo-search::placeholder { color: var(--fg-muted); }
.neo-search:focus {
  box-shadow:
    inset 3px 3px 8px rgba(0,0,0,0.35),
    inset -2px -2px 6px var(--neo-shadow-light),
    0 0 0 2px rgba(145,160,255,0.3);
  border-color: rgba(145,160,255,0.3);
}
.neo-search-icon {
  position: absolute; left: 13px; top: 50%; transform: translateY(-50%);
  font-size: 14px; pointer-events: none; color: var(--fg-muted);
}
[data-theme="light"] .neo-search {
  background: var(--surface);
  box-shadow:
    inset 3px 3px 8px rgba(180,185,210,0.4),
    inset -2px -2px 6px rgba(255,255,255,0.85);
}

/* ---- Empty State ---- */
.courses-empty {
  text-align: center; padding: 60px 20px;
  color: var(--fg-muted); font-size: 14px;
}
.courses-empty-icon { font-size: 40px; margin-bottom: 12px; }

/* ---- Lesson Modal ---- */
.lesson-modal {
  position: fixed; inset: 0; z-index: 300;
  background: rgba(4,6,16,0.78);
  display: flex; align-items: center; justify-content: center; padding: 0;
}
.lesson-modal[hidden] { display: none; }
.lesson-modal-dialog { width: 100%; height: 100%; background: var(--bg); }
.lesson-modal-dialog iframe { width: 100%; height: 100%; border: none; display: block; }

/* ---- Footer ---- */
.site-footer {
  border-top: 1px solid var(--border); padding: 36px 0 24px;
  background: var(--surface);
}
.footer-inner {
  max-width: var(--container); margin: 0 auto; padding: 0 20px;
  display: flex; flex-direction: column; gap: 16px;
}
.footer-row {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 12px;
}
.footer-brand { font-size: 13px; font-weight: 800; color: var(--fg-muted); }
.footer-links { display: flex; gap: 16px; flex-wrap: wrap; }
.footer-links a { font-size: 12px; color: var(--fg-muted); }
.footer-links a:hover { color: var(--accent); }
.footer-copy { font-size: 11px; color: var(--fg-muted); }

/* ---- Responsive ---- */
@media (min-width: 480px) {
  .neo-courses-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 640px) {
  .courses-hero-inner { flex-direction: row; align-items: flex-end; justify-content: space-between; }
  .courses-hero-stats { flex-direction: row; }
}
@media (min-width: 768px) {
  .neo-courses-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .primary-nav { display: flex; }
  .header-actions .btn-primary { display: inline-flex; }
  .nav-toggle { display: none; }
  .neo-courses-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 1280px) {
  .neo-courses-grid { grid-template-columns: repeat(4, 1fr); }
}

/* ============================================================
   ACADEMY-STYLE COURSE EXPERIENCE
   Structure inspired by VibeAcademy: floating nav, split hero,
   learning-map introduction, calm content canvas, clear next action.
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  height: auto;
  padding: 14px 16px 0;
  border: 0;
  background: transparent;
}
.header-inner {
  height: 60px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 18px 0 22px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: color-mix(in srgb, var(--bg) 84%, transparent);
  box-shadow: 0 12px 30px rgba(0,0,0,0.18);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}
.site-header.is-scrolled .header-inner {
  box-shadow: 0 14px 34px rgba(0,0,0,0.28);
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--accent-strong);
  color: #fff;
  font-size: 15px;
}
.brand-text { letter-spacing: -0.02em; }

.courses-hero {
  padding: 14px 16px 0;
  border: 0;
}
.academy-hero-grid {
  max-width: var(--container);
  min-height: 520px;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
  grid-template-rows: 1fr auto;
  gap: 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 28px;
  background:
    radial-gradient(circle at 12% 20%, rgba(145,160,255,0.13), transparent 34%),
    linear-gradient(145deg, var(--surface-strong), var(--surface));
  box-shadow: var(--shadow-lg);
}
.academy-hero-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 52px 44px 34px;
}
.academy-hero-copy h1 {
  margin-top: 18px;
  font-size: clamp(32px, 4.2vw, 54px);
  line-height: 1.16;
  letter-spacing: -0.04em;
}
.academy-hero-copy .courses-hero-sub {
  margin-top: 22px;
  max-width: 35ch;
  font-size: 15px;
  line-height: 1.85;
}
.academy-start-btn {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: fit-content;
  min-width: 190px;
  margin-top: 28px;
  padding: 12px 18px 12px 20px;
  border-radius: 999px;
  color: #0b1020;
  background: linear-gradient(135deg, var(--accent), var(--info));
  box-shadow: 0 10px 26px rgba(88,110,232,0.32);
  font-size: 13px;
  font-weight: 800;
  transition: transform 0.2s var(--ease-soft), box-shadow 0.2s var(--ease-soft);
}
.academy-start-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 32px rgba(88,110,232,0.46);
}
.academy-start-btn span { font-size: 19px; line-height: 1; }
.academy-microcopy {
  margin-top: 14px;
  color: var(--fg-dim, var(--fg-muted));
  font-size: 11px;
}
.academy-lesson-preview {
  align-self: center;
  margin: 30px 38px 24px 12px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--surface-sunken, var(--surface));
  box-shadow: var(--neo-raised);
  overflow: hidden;
  transform: rotate(1.2deg);
  transition: transform 0.35s var(--ease-soft), box-shadow 0.35s var(--ease-soft);
}
.academy-lesson-preview:hover {
  transform: rotate(0) translateY(-4px);
  box-shadow: var(--shadow-lg), 0 0 26px rgba(145,160,255,0.16);
}
.alp-window-bar {
  height: 38px;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 14px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-strong);
  font: 700 10px var(--font-mono);
  color: var(--fg-muted);
}
.alp-window-bar > span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--danger);
}
.alp-window-bar > span:nth-child(2) { background: var(--warning); }
.alp-window-bar > span:nth-child(3) { background: var(--success); }
.alp-window-bar b { margin-left: 7px; font-weight: 700; }
.alp-window-bar i { margin-left: auto; color: var(--success); font-style: normal; font-size: 9px; }
.alp-window-body {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 14px;
  padding: 16px;
}
.alp-video-placeholder {
  min-height: 205px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  border-radius: 14px;
  background:
    linear-gradient(135deg, rgba(88,110,232,0.32), transparent),
    repeating-linear-gradient(135deg, rgba(255,255,255,0.04) 0 2px, transparent 2px 10px),
    #0d1425;
  color: #fff;
}
.alp-play {
  display: grid;
  place-items: center;
  width: 50px;
  height: 50px;
  padding-left: 3px;
  border-radius: 50%;
  background: var(--accent);
  color: #0b1020;
  box-shadow: 0 0 0 9px rgba(145,160,255,0.14), 0 0 30px rgba(145,160,255,0.32);
}
.alp-video-placeholder small { color: rgba(255,255,255,0.65); font: 10px var(--font-mono); }
.alp-preview-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 12px;
  padding: 4px;
}
.alp-kicker { color: var(--lp-success, var(--success)); font: 800 10px var(--font-mono); letter-spacing: 0.08em; }
.alp-preview-copy strong { font-size: 17px; line-height: 1.4; }
.alp-slider {
  height: 7px;
  position: relative;
  border-radius: 99px;
  background: var(--border);
}
.alp-slider i { display: block; width: 72%; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--accent-strong), var(--success)); }
.alp-slider b { position: absolute; top: 50%; left: 72%; width: 16px; height: 16px; border-radius: 50%; transform: translate(-50%, -50%); background: var(--accent); box-shadow: 0 0 0 5px rgba(145,160,255,0.15); }
.alp-caption { color: var(--fg-muted); font-size: 11px; line-height: 1.5; }
.alp-coach {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 16px 16px;
  padding: 10px 12px;
  border: 1px solid rgba(145,160,255,0.24);
  border-radius: 12px;
  background: rgba(145,160,255,0.08);
}
.alp-coach > span { font-size: 24px; }
.alp-coach p { flex: 1; color: var(--fg-muted); font-size: 11px; line-height: 1.45; }
.alp-coach p b { color: var(--fg); }
.alp-coach em { color: var(--accent); font: 800 9px var(--font-mono); font-style: normal; }
.academy-stats {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  margin: 0;
  padding: 18px 44px 22px;
  border-top: 1px solid var(--border);
}
.academy-stats .ch-stat { padding-right: 20px; }
.academy-stats .ch-stat + .ch-stat { padding-left: 20px; border-left: 1px solid var(--border); }
.academy-stats .ch-stat-num { font-size: 24px; }

.courses-main { padding: 62px 16px 90px; }
.academy-section-intro {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 28px;
}
.academy-section-kicker {
  display: block;
  margin-bottom: 8px;
  color: var(--accent);
  font: 800 10px var(--font-mono);
  letter-spacing: 0.1em;
}
.academy-section-intro h2 { font-size: clamp(22px, 3vw, 32px); line-height: 1.3; letter-spacing: -0.03em; }
.academy-section-intro > p { max-width: 36ch; color: var(--fg-muted); font-size: 13px; line-height: 1.7; }
.courses-count-bar { margin-bottom: 18px; }
.neo-domain-tabs { gap: 8px; margin-bottom: 12px; }
.neo-tab { padding: 8px 16px; min-height: 40px; font-size: 12px; }
.neo-level-filters { margin-bottom: 34px; }
.neo-courses-grid { gap: 18px; }
.neo-course-card {
  border-radius: 18px;
  padding: 20px;
  box-shadow: 5px 5px 14px var(--neo-shadow-dark), -3px -3px 10px var(--neo-shadow-light);
}
.neo-course-card:hover { transform: translateY(-4px); }
.ncc-launch { min-height: 38px; border-radius: 999px; }

@media (max-width: 767px) {
  .site-header { padding: 10px 10px 0; }
  .header-inner { padding: 0 12px 0 16px; }
  .brand-text { font-size: 12px; }
  .academy-hero-grid { display: flex; flex-direction: column; min-height: 0; border-radius: 22px; }
  .academy-hero-copy { padding: 36px 24px 20px; }
  .academy-hero-copy h1 { font-size: 34px; }
  .academy-lesson-preview { margin: 18px 18px 22px; transform: none; }
  .alp-window-body { grid-template-columns: 1fr; }
  .alp-video-placeholder { min-height: 150px; }
  .alp-preview-copy { padding: 8px 4px 2px; }
  .academy-stats { grid-template-columns: repeat(2, 1fr); padding: 16px 20px; }
  .academy-stats .ch-stat { padding: 8px 0; }
  .academy-stats .ch-stat + .ch-stat { padding-left: 12px; }
  .academy-stats .ch-stat:nth-child(3) { border-left: 0; padding-left: 0; }
  .academy-section-intro { align-items: flex-start; flex-direction: column; gap: 10px; }
  .academy-section-intro > p { max-width: 48ch; }
}

.academy-module-group-head {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 26px 0 8px;
  padding: 0 2px 10px;
  border-bottom: 2px solid var(--border);
}
.amgh-icon {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: rgba(145,160,255,0.12);
  font-size: 21px;
}
.amgh-kicker {
  color: var(--accent);
  font: 800 9px var(--font-mono);
  letter-spacing: 0.1em;
}
.academy-module-group-head h3 { font-size: 17px; line-height: 1.25; margin-top: 2px; }
.amgh-count {
  margin-left: auto;
  color: var(--fg-muted);
  font-size: 11px;
  white-space: nowrap;
}
.neo-courses-grid {
  grid-template-columns: 1fr;
  gap: 0;
}
.neo-course-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  column-gap: 24px;
  row-gap: 8px;
  border-radius: 0;
  padding: 18px 20px;
  box-shadow: none;
  border: 1px solid var(--border);
  border-bottom: 0;
}
.neo-course-card:first-of-type { border-radius: 14px 14px 0 0; }
.neo-course-card:last-child { border-bottom: 1px solid var(--border); border-radius: 0 0 14px 14px; }
.neo-course-card:hover {
  transform: none;
  background: color-mix(in srgb, var(--surface-raised) 78%, var(--accent) 5%);
  box-shadow: none;
}
.neo-course-card .ncc-top-row { grid-column: 1 / -1; }
.neo-course-card h3 { grid-column: 1; grid-row: 2; align-self: end; font-size: 16px; }
.neo-course-card .ncc-desc { grid-column: 1; grid-row: 3; max-width: 66ch; }
.neo-course-card .ncc-concepts { grid-column: 1; grid-row: 4; }
.neo-course-card .ncc-progress-wrap { grid-column: 1; grid-row: 5; max-width: 300px; }
.neo-course-card .ncc-footer {
  grid-column: 2;
  grid-row: 2 / span 4;
  align-self: center;
  min-width: 138px;
  flex-direction: column;
  align-items: stretch;
  gap: 10px;
}
.neo-course-card .ncc-meta { justify-content: flex-end; }
.neo-course-card .ncc-launch { width: 100%; }

@media (max-width: 767px) {
  .academy-module-group-head { margin-top: 22px; }
  .neo-course-card {
    display: flex;
    border-radius: 0;
    padding: 18px;
    box-shadow: var(--neo-raised-sm);
  }
  .neo-course-card:first-of-type, .neo-course-card:last-child { border-radius: 16px; }
  .neo-course-card + .neo-course-card { border-top: 0; border-radius: 0; }
  .neo-course-card .ncc-footer { min-width: 0; flex-direction: row; align-items: center; }
  .neo-course-card .ncc-meta { justify-content: flex-start; }
  .neo-course-card .ncc-launch { width: auto; }
}