/* ============================================
   COURS D'ARABE — Premium Design System
   Dark theme · Gold accent · Glassmorphism
   ============================================ */

/* ---------- Custom Properties (Dark) ---------- */
:root {
  color-scheme: dark;

  --bg-0: #06090f;
  --bg-1: #0c1119;
  --bg-2: #131b28;
  --bg-3: #1a2436;

  --surface: rgba(255, 255, 255, 0.04);
  --surface-hover: rgba(255, 255, 255, 0.07);
  --surface-active: rgba(255, 255, 255, 0.11);

  --glass: rgba(255, 255, 255, 0.035);
  --glass-border: rgba(255, 255, 255, 0.07);
  --glass-hover: rgba(255, 255, 255, 0.065);

  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.16);
  --border-active: rgba(255, 255, 255, 0.24);

  --text: #e2e8f0;
  --text-2: #94a3b8;
  --text-3: #64748b;
  --ink: #f8fafc;
  --muted: #94a3b8;

  --accent: #f0b429;
  --accent-hover: #f7c948;
  --accent-soft: rgba(240, 180, 41, 0.14);
  --accent-glow: rgba(240, 180, 41, 0.22);
  --accent-weak: rgba(240, 180, 41, 0.07);

  --nahw: #34d399;
  --nahw-bg: rgba(52, 211, 153, 0.12);
  --nahw-text: #6ee7b7;
  --sarf: #a78bfa;
  --sarf-bg: rgba(167, 139, 250, 0.12);
  --sarf-text: #c4b5fd;
  --balagha: #fb923c;
  --balagha-bg: rgba(251, 146, 60, 0.12);
  --balagha-text: #fdba74;

  --success: #22c55e;
  --success-bg: rgba(34, 197, 94, 0.12);
  --danger: #ef4444;
  --focus: #60a5fa;

  --panel: var(--bg-2);
  --panel-soft: var(--bg-3);
  --line: var(--border);
  --bg: var(--bg-1);

  --font-ui: 'Inter', system-ui, sans-serif;
  --font-ar: 'Noto Naskh Arabic', Tahoma, sans-serif;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 999px;

  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.55);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.3), 0 4px 16px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 0 24px var(--accent-glow);

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
}

/* ---------- Light Theme ---------- */
[data-theme="light"] {
  color-scheme: light;
  --bg-0: #f8fafb;
  --bg-1: #f1f4f8;
  --bg-2: #ffffff;
  --bg-3: #edf0f4;

  --surface: rgba(0, 0, 0, 0.025);
  --surface-hover: rgba(0, 0, 0, 0.05);
  --surface-active: rgba(0, 0, 0, 0.08);

  --glass: rgba(255, 255, 255, 0.75);
  --glass-border: rgba(0, 0, 0, 0.08);
  --glass-hover: rgba(255, 255, 255, 0.9);

  --border: rgba(0, 0, 0, 0.09);
  --border-hover: rgba(0, 0, 0, 0.16);
  --border-active: rgba(0, 0, 0, 0.24);

  --text: #1e293b;
  --text-2: #64748b;
  --text-3: #94a3b8;
  --ink: #0f172a;
  --muted: #64748b;

  --accent: #d97706;
  --accent-hover: #b45309;
  --accent-soft: rgba(217, 119, 6, 0.12);
  --accent-glow: rgba(217, 119, 6, 0.18);
  --accent-weak: rgba(217, 119, 6, 0.06);

  --nahw: #059669;
  --nahw-bg: rgba(5, 150, 105, 0.09);
  --nahw-text: #065f46;
  --sarf: #7c3aed;
  --sarf-bg: rgba(124, 58, 237, 0.09);
  --sarf-text: #5b21b6;
  --balagha: #ea580c;
  --balagha-bg: rgba(234, 88, 12, 0.09);
  --balagha-text: #9a3412;

  --success: #16a34a;
  --success-bg: rgba(22, 163, 74, 0.09);
  --danger: #dc2626;

  --panel: var(--bg-2);
  --panel-soft: var(--bg-3);
  --line: var(--border);
  --bg: var(--bg-1);

  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 4px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.1);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.05), 0 2px 10px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 16px var(--accent-glow);
}

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

* {
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.12) transparent;
}

[data-theme="light"] * {
  scrollbar-color: rgba(0, 0, 0, 0.15) transparent;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  background: var(--bg-1);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: var(--accent-soft);
  color: var(--ink);
}

button,
input,
select {
  font: inherit;
}

button {
  color: inherit;
}

a {
  color: var(--accent);
  text-decoration: none;
}

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

h1, h2, h3, p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  font-size: 28px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

h2 {
  margin: 0;
  color: var(--ink);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.2;
}

h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.3;
}

/* ---------- Scrollbar (WebKit) ---------- */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.1);
}

[data-theme="light"] ::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.12);
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* ---------- App Shell & Layout ---------- */
.app-shell {
  display: block;
  min-height: 100vh;
  position: relative;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(320px, 420px) minmax(0, 1fr);
  min-width: 0;
  min-height: 100vh;
}

.workspace.is-home {
  display: block;
  min-width: 0;
}

.workspace.is-home .course-panel,
.workspace.is-home .lesson-panel,
.workspace.is-course .home-panel {
  display: none;
}

/* ---------- Home Panel ---------- */
.home-panel {
  min-height: 100vh;
  background:
    radial-gradient(ellipse 70% 40% at 50% 0%, var(--accent-weak), transparent),
    radial-gradient(ellipse 50% 30% at 80% 10%, var(--sarf-bg), transparent),
    var(--bg-1);
}

.home-hero {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid var(--border);
  padding: 36px 32px 28px;
}

.home-hero h1 {
  background: linear-gradient(135deg, var(--ink) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-size: 32px;
}

.home-hero h2 {
  margin-top: 8px;
  color: var(--text-2);
  font-size: 18px;
  font-weight: 500;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.home-stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

/* ---------- Search ---------- */
.home-tools {
  border-bottom: 1px solid var(--border);
  padding: 16px 32px;
}

.home-tools .search-box {
  max-width: 560px;
}

.search-box {
  display: grid;
  gap: 6px;
  color: var(--text-2);
  font-size: 13px;
  font-weight: 600;
}

.search-box input {
  width: 100%;
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 12px 16px;
  color: var(--text);
  font-size: 15px;
  outline: none;
  transition: border-color 250ms, box-shadow 250ms;
}

.search-box input::placeholder {
  color: var(--text-3);
}

.search-box input:focus-visible {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft), var(--shadow-sm);
}

/* ---------- Focus States ---------- */
.source-link:focus-visible,
.course-tile:focus-visible,
.module-tile:focus-visible,
.tab:focus-visible,
.segment-button:focus-visible,
.answer-toggle:focus-visible,
.resource-viewer-button:focus-visible,
.lesson-select select:focus-visible,
.theme-toggle:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

/* ---------- Course Tile Grid ---------- */
.course-tile-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  direction: rtl;
  padding: 24px 32px 40px;
}

/* ---------- Course Tile ---------- */
.course-tile {
  display: grid;
  align-content: space-between;
  min-height: 240px;
  cursor: pointer;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  background: var(--glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  direction: ltr;
  padding: 20px;
  text-align: left;
  box-shadow: var(--shadow-card);
  transition: transform 300ms var(--ease-out),
              box-shadow 300ms var(--ease-out),
              border-color 300ms var(--ease-out);
  animation: fadeInUp 500ms var(--ease-out) both;
}

.course-tile:nth-child(2) { animation-delay: 40ms; }
.course-tile:nth-child(3) { animation-delay: 80ms; }
.course-tile:nth-child(4) { animation-delay: 120ms; }
.course-tile:nth-child(5) { animation-delay: 160ms; }
.course-tile:nth-child(6) { animation-delay: 200ms; }
.course-tile:nth-child(7) { animation-delay: 240ms; }
.course-tile:nth-child(8) { animation-delay: 280ms; }
.course-tile:nth-child(9) { animation-delay: 320ms; }
.course-tile:nth-child(10) { animation-delay: 360ms; }
.course-tile:nth-child(n+11) { animation-delay: 400ms; }

.course-tile:hover {
  transform: translateY(-6px);
  border-color: var(--accent-glow);
  box-shadow: var(--shadow-md), 0 0 30px var(--accent-glow);
}

.course-tile.is-done {
  border-color: rgba(34, 197, 94, 0.25);
  background: linear-gradient(160deg, var(--success-bg), var(--glass) 60%);
}

.course-tile.is-done:hover {
  box-shadow: var(--shadow-md), 0 0 24px rgba(34, 197, 94, 0.15);
}

.course-tile-top,
.course-tile-bottom {
  display: grid;
  gap: 12px;
}

.course-tile-badges,
.course-tile-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.course-tile-badge {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  border-radius: var(--radius-full);
  padding: 3px 10px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.course-tile-badge[data-group="Nahw"] {
  background: var(--nahw-bg);
  color: var(--nahw-text);
}

.course-tile-badge[data-group="Sarf"] {
  background: var(--sarf-bg);
  color: var(--sarf-text);
}

.course-tile-badge[data-group="Balagha"] {
  background: var(--balagha-bg);
  color: var(--balagha-text);
}

.course-tile h3 {
  color: var(--ink);
  font-size: 26px;
  font-weight: 700;
}

.course-tile h3,
#courseTitle,
#moduleTitle {
  font-family: var(--font-ar);
  font-weight: 400;
  line-height: 1.55;
}

.course-tile-preview {
  display: -webkit-box;
  overflow: hidden;
  min-height: 44px;
  color: var(--text-2);
  font-size: 14px;
  line-height: 1.6;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.course-tile-stat {
  color: var(--text-3);
  font-size: 12px;
  font-weight: 600;
}

/* ---------- Progress Track ---------- */
.progress-track {
  display: block;
  overflow: hidden;
  width: 100%;
  height: 5px;
  border-radius: var(--radius-full);
  background: var(--surface);
}

.progress-track span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  transition: width 600ms var(--ease-out);
}

/* ---------- Stats & Meta ---------- */
.total-stats,
.course-stats,
.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--text-2);
  font-size: 13px;
}

/* ---------- Pill ---------- */
.pill {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  background: var(--glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 3px 11px;
  white-space: nowrap;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-2);
}

/* ---------- Course Panel (left sidebar) ---------- */
.course-panel,
.lesson-panel {
  min-width: 0;
  min-height: 100vh;
  background: var(--bg-0);
}

.course-panel {
  border-right: 1px solid var(--border);
  background:
    radial-gradient(ellipse 90% 30% at 50% 0%, var(--accent-weak), transparent),
    var(--bg-0);
}

.lesson-panel {
  border-right: 0;
  background: var(--bg-1);
}

.course-heading,
.lesson-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  border-bottom: 1px solid var(--border);
  padding: 20px;
}

.course-actions,
.lesson-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

/* ---------- Source Link / Buttons ---------- */
.source-link {
  flex: 0 0 auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 8px 14px;
  cursor: pointer;
  text-decoration: none;
  color: var(--text);
  font-size: 13px;
  font-weight: 600;
  transition: background 200ms, border-color 200ms, box-shadow 200ms, color 200ms;
}

.source-link:hover {
  background: var(--surface-hover);
  border-color: var(--border-hover);
  color: var(--ink);
}

.source-link.is-done {
  background: var(--accent);
  border-color: var(--accent);
  color: #000;
}

/* ---------- Module Tile Grid ---------- */
.module-tile-grid {
  display: grid;
  align-content: start;
  gap: 8px;
  max-height: calc(100vh - 120px);
  overflow: auto;
  padding: 14px;
}

/* ---------- Module Tile ---------- */
.module-tile {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  width: 100%;
  min-width: 0;
  cursor: pointer;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  background: transparent;
  padding: 12px 14px;
  text-align: left;
  transition: background 200ms, border-color 200ms, transform 200ms;
}

.module-tile:hover {
  background: var(--surface-hover);
  border-color: var(--border);
}

.module-tile.is-active {
  background: var(--accent-weak);
  border-color: var(--accent-soft);
  box-shadow: inset 3px 0 0 var(--accent);
}

.module-tile.is-done .lesson-number {
  background: linear-gradient(135deg, var(--success), #16a34a);
  color: #fff;
  box-shadow: 0 2px 8px rgba(34, 197, 94, 0.3);
}

.lesson-number {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 800;
  font-size: 14px;
  transition: background 200ms, color 200ms, box-shadow 200ms;
}

.lesson-main {
  display: grid;
  min-width: 0;
  gap: 4px;
}

.lesson-main strong {
  color: var(--ink);
  font-family: var(--font-ar);
  font-size: 26px;
  font-weight: 400;
  line-height: 1.5;
}

.lesson-preview {
  display: -webkit-box;
  overflow: hidden;
  color: var(--text-2);
  font-size: 14px;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.lesson-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--text-3);
  font-size: 12px;
  font-weight: 500;
}

/* ---------- Lesson Header ---------- */
.lesson-select {
  display: inline-grid;
  grid-template-columns: auto minmax(86px, 150px);
  align-items: center;
  gap: 8px;
  color: var(--text-2);
  font-size: 13px;
  font-weight: 700;
}

.lesson-select select {
  min-height: 38px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--glass);
  padding: 6px 10px;
  color: var(--text);
  cursor: pointer;
  transition: border-color 200ms;
}

.lesson-select select:hover {
  border-color: var(--border-hover);
}

.module-progress {
  margin: 6px 0 0;
  color: var(--text-2);
  font-size: 13px;
  font-weight: 700;
}

/* ---------- Audio Player ---------- */
.audio-player {
  display: block;
  width: calc(100% - 40px);
  margin: 20px;
  border-radius: var(--radius-md);
  accent-color: var(--accent);
  filter: contrast(0.9) brightness(1.1);
}

/* ---------- Tab Bar ---------- */
.tabbar {
  display: flex;
  gap: 2px;
  border-bottom: 1px solid var(--border);
  padding: 0 20px;
  background: var(--surface);
}

.tab {
  position: relative;
  min-height: 44px;
  cursor: pointer;
  border: none;
  border-bottom: 2px solid transparent;
  background: transparent;
  padding: 10px 14px;
  color: var(--text-3);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.01em;
  transition: color 200ms, border-color 200ms;
}

.tab:hover {
  color: var(--text);
}

.tab.is-active {
  border-bottom-color: var(--accent);
  color: var(--accent);
}

.tab-panel {
  display: none;
  padding: 20px;
  animation: fadeIn 300ms var(--ease-out);
}

.tab-panel.is-active {
  display: block;
}

/* ---------- Course Content / Markdown ---------- */
.course-content {
  max-width: 1100px;
  font-family: var(--font-ar);
}

.module-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.module-card-detail {
  border: 0;
  background: transparent;
  backdrop-filter: none;
  box-shadow: none;
  padding: 0;
}

.module-heading {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  margin-bottom: 16px;
}

.markdown-body {
  color: var(--text);
  font-size: 28px;
  line-height: 2;
}

.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  margin: 24px 0 10px;
  padding: var(--spacing-lg);
  font-size: 25px;
  line-height: 1.8;
  color: var(--accent);
}

.markdown-body p,
.markdown-body ul,
.markdown-body ol {
  margin: 10px 0;
}

.markdown-body ul,
.markdown-body ol {
  padding-inline-start: 26px;
}

.markdown-body code {
  border-radius: 5px;
  background: var(--accent-weak);
  padding: 2px 7px;
  font-family: inherit;
  font-weight: 700;
  color: var(--accent);
}

.table-wrap {
  overflow-x: auto;
  margin: 16px 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xs);
}

.markdown-body table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  background: var(--glass);
  font-size: 19px;
  line-height: 1.7;
}

.markdown-body th,
.markdown-body td {
  border-bottom: 1px solid var(--border);
  padding: 10px 12px;
  text-align: right;
  vertical-align: top;
}

.markdown-body th {
  background: var(--surface);
  color: var(--accent);
  font-weight: 700;
}

.markdown-body tr:last-child td {
  border-bottom: 0;
}

.markdown-body tr:hover td {
  background: var(--surface-hover);
}

/* ---------- Quiz ---------- */
.quiz-list {
  display: grid;
  gap: 14px;
  max-width: 1050px;
  font-family: var(--font-ar);
}

.quiz-summary,
.question-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
}

.quiz-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px;
}

.quiz-summary h3 {
  font-size: 26px;
  color: var(--ink);
  margin-bottom: var(--spacing-sm);
}

.quiz-score {
  display: grid;
  min-width: 180px;
  direction: ltr;
  gap: 8px;
}

.question-card {
  padding: 18px;
  transition: border-color 300ms, background 300ms;
}

.question-card.is-done {
  border-color: rgba(34, 197, 94, 0.25);
  background: linear-gradient(160deg, var(--success-bg), var(--glass) 60%);
}

.question-card-top {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
}

.question-details {
  min-width: 0;
  color: var(--text);
  font-size: 28px;
  line-height: 1.8;
}

.question-prompt {
  color: var(--ink);
  font-weight: 700;
}

.question-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.answer-toggle {
  min-width: 100px;
  cursor: pointer;
  border: 1px solid var(--accent-soft);
  border-radius: var(--radius-sm);
  background: var(--accent-weak);
  padding: 9px 16px;
  color: var(--accent);
  font-weight: 700;
  font-size: 14px;
  transition: background 200ms, border-color 200ms, box-shadow 200ms;
}

.answer-toggle:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}

.question-answer {
  margin-top: 14px;
  border-top: 1px solid var(--border);
  padding-top: 14px;
  animation: slideDown 300ms var(--ease-out);
}

.question-answer .markdown-body,
.question-answer p {
  margin: 0;
}

/* ---------- Resources ---------- */
.resource-list {
  display: grid;
  gap: 16px;
  max-width: 1180px;
}

.resource-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 18px;
  box-shadow: var(--shadow-xs);
}

.resource-item h3 {
  margin-bottom: 12px;
  color: var(--ink);
}

.resource-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.resource-viewer-button,
.resource-links a,
.resource-links span {
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  background: var(--glass);
  padding: 8px 14px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background 200ms, border-color 200ms, box-shadow 200ms;
}

.resource-viewer-button {
  color: var(--ink);
  font-weight: 700;
}

.resource-viewer-button:hover,
.resource-links a:hover {
  background: var(--accent-weak);
  border-color: var(--accent-soft);
  box-shadow: 0 0 12px var(--accent-glow);
}

/* ---------- Segments ---------- */
.segment-list {
  display: grid;
  gap: 8px;
  max-width: 980px;
}

.segment-button {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 12px;
  width: 100%;
  cursor: pointer;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--glass);
  padding: 12px 14px;
  text-align: right;
  transition: background 200ms, border-color 200ms;
}

.segment-button:hover {
  background: var(--surface-hover);
  border-color: var(--border-hover);
}

.segment-time {
  direction: ltr;
  color: var(--accent);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
  font-weight: 600;
  text-align: left;
  white-space: nowrap;
}

/* ---------- Transcript ---------- */
.transcript-text {
  max-width: 980px;
  margin-top: 14px;
  color: var(--text);
  font-family: var(--font-ar);
  font-size: 28px;
  line-height: 2;
  white-space: pre-wrap;
}

/* ---------- Highlight ---------- */
mark {
  border-radius: 4px;
  background: var(--accent-soft);
  color: var(--accent);
  padding: 0 3px;
}

/* ---------- Notes ---------- */
.notes {
  display: grid;
  gap: 8px;
  color: var(--text-2);
}

/* ---------- Empty & Error ---------- */
.empty,
.error {
  color: var(--text-3);
  padding: 20px;
  font-size: 14px;
}

.error {
  color: var(--danger);
}

/* ---------- Theme Toggle ---------- */
.theme-toggle {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1000;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  cursor: pointer;
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  background: var(--glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-md);
  color: var(--accent);
  transition: transform 200ms, box-shadow 200ms, border-color 200ms;
}

.theme-toggle:hover {
  transform: scale(1.1);
  border-color: var(--accent-soft);
  box-shadow: var(--shadow-md), 0 0 20px var(--accent-glow);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
  transition: transform 300ms var(--ease-out);
}

.theme-toggle:hover svg {
  transform: rotate(15deg);
}

.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }

[data-theme="light"] .theme-toggle .icon-sun { display: block; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }

/* ---------- Sidebar (unused but kept) ---------- */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 100vh;
  border-right: 1px solid var(--border);
  background: var(--bg-0);
  padding: 18px;
}

.sidebar-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.home-button {
  display: grid;
  width: 100%;
  gap: 2px;
  cursor: pointer;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--glass);
  padding: 11px 12px;
  text-align: left;
}

.home-button span {
  color: var(--text-3);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

.home-button strong {
  color: var(--ink);
  font-size: 15px;
}

.home-button:hover,
.home-button.is-active {
  border-color: var(--accent-soft);
  background: var(--accent-weak);
}

.course-nav {
  display: grid;
  gap: 14px;
  overflow: auto;
  padding-right: 2px;
}

.group-label {
  margin: 8px 0 6px;
  color: var(--text-3);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.course-group {
  display: grid;
  gap: 6px;
}

.course-button,
.lesson-button {
  cursor: pointer;
  border: 1px solid transparent;
  background: transparent;
}

.course-button {
  display: grid;
  width: 100%;
  min-width: 0;
  gap: 4px;
  border-radius: var(--radius-sm);
  padding: 10px;
  text-align: left;
}

.course-button:hover,
.course-button.is-active {
  border-color: var(--border);
  background: var(--surface);
}

.course-button strong {
  color: var(--ink);
  font-size: 14px;
  line-height: 1.25;
}

.course-button span {
  color: var(--text-2);
  font-size: 12px;
}

/* ---------- Animations ---------- */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 1120px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .course-panel,
  .lesson-panel {
    min-height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  .module-tile-grid {
    max-height: 380px;
  }

  .home-panel {
    min-height: auto;
  }
}

@media (max-width: 768px) {
  .home-hero {
    padding: 28px 20px 24px;
  }

  .home-hero h1 {
    font-size: 26px;
  }

  .home-tools {
    padding: 14px 20px;
  }

  .course-tile-grid {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    padding: 16px 20px 32px;
  }
}

@media (max-width: 640px) {
  .home-hero,
  .home-tools,
  .course-heading,
  .lesson-header,
  .tab-panel {
    padding: 16px;
  }

  .course-heading,
  .home-hero,
  .lesson-header,
  .course-actions,
  .lesson-actions {
    display: grid;
    justify-content: stretch;
  }

  .home-hero h1 {
    font-size: 24px;
  }

  .home-hero h2 {
    font-size: 16px;
  }

  .home-stats {
    justify-content: flex-start;
  }

  .course-tile-grid {
    grid-template-columns: 1fr;
    padding: 14px 16px 28px;
  }

  .course-tile {
    min-height: 200px;
    padding: 16px;
  }

  .audio-player {
    width: calc(100% - 32px);
    margin: 16px;
  }

  .tabbar {
    overflow-x: auto;
    padding: 0 16px;
  }

  .module-tile {
    grid-template-columns: 34px minmax(0, 1fr);
  }

  .lesson-number {
    width: 34px;
    height: 34px;
    font-size: 13px;
  }

  .transcript-text {
    font-size: 22px;
    line-height: 1.9;
  }

  .markdown-body {
    font-size: 23px;
    line-height: 1.9;
  }

  .module-card {
    padding: 14px;
  }

  .segment-button {
    grid-template-columns: 1fr;
  }

  .quiz-summary,
  .question-card {
    grid-template-columns: 1fr;
  }

  .quiz-summary {
    display: grid;
  }

  .question-card-top {
    grid-template-columns: 34px minmax(0, 1fr);
  }

  .question-details {
    font-size: 21px;
    line-height: 1.9;
  }

  .theme-toggle {
    bottom: 16px;
    right: 16px;
    width: 42px;
    height: 42px;
  }

  .theme-toggle svg {
    width: 18px;
    height: 18px;
  }
}

/* ---------- Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}