:root {
  color-scheme: dark;
  --bg: #0b1220;
  --panel: rgba(15, 23, 42, 0.88);
  --panel-strong: #111827;
  --line: rgba(148, 163, 184, 0.18);
  --text: #e5eefc;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --accent-2: #22c55e;
  --focus-ring: #67e8f9;
  --focus-ring-shadow: rgba(103, 232, 249, 0.35);
  --danger: #fb7185;
  --warning: #f59e0b;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
  --header-height: 76px;
  --safe-left: env(safe-area-inset-left, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --mobile-toolbar-height: 0px;
  --quiz-bottom-clearance: 0px;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: radial-gradient(circle at top, rgba(56, 189, 248, 0.16), transparent 28%), linear-gradient(180deg, #0b1220 0%, #0f172a 100%);
  color: var(--text);
  overflow-x: hidden;
}

html:lang(he) body {
  font-family: 'Noto Sans Hebrew', Inter, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

a { color: var(--accent); }
button { font: inherit; }

.skip-link {
  position: absolute;
  top: 0;
  left: max(12px, var(--safe-left));
  z-index: 1000;
  transform: translateY(-140%);
  padding: 10px 14px;
  border-radius: 10px;
  background: var(--panel-strong);
  border: 1px solid var(--focus-ring);
  color: var(--text);
  text-decoration: none;
}

.skip-link:focus-visible {
  transform: translateY(calc(var(--safe-top) + 10px));
  box-shadow: 0 0 0 3px var(--focus-ring-shadow);
}

[dir='rtl'] .skip-link {
  left: auto;
  right: max(12px, var(--safe-right));
}

.sr-only {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.app-shell {
  width: min(1180px, calc(100vw - max(24px, calc(var(--safe-left) + var(--safe-right) + 24px))));
  margin: 0 auto;
  padding: calc(var(--header-height) + 18px + var(--safe-top)) 0 calc(40px + var(--safe-bottom) + var(--mobile-toolbar-height));
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(18px);
  background: rgba(11, 18, 32, 0.72);
  border-bottom: 1px solid rgba(148, 163, 184, 0.12);
  padding-top: var(--safe-top);
}

.topbar-inner {
  width: min(1180px, calc(100vw - max(24px, calc(var(--safe-left) + var(--safe-right) + 24px))));
  min-height: var(--header-height);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 0;
}

.brand { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.brand-title { margin: 0; font-size: 1.05rem; font-weight: 800; letter-spacing: 0.01em; }
.brand-subtitle { color: var(--muted); font-size: 0.88rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.topbar-quiz-progress {
  display: none;
  color: #bfeaff;
  font-size: 0.78rem;
  line-height: 1.2;
  margin-top: 2px;
}
.topbar-actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; justify-content: flex-end; }

.language-switcher {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid var(--line);
}

.lang-btn {
  min-width: 54px;
  min-height: 44px;
  padding: 9px 12px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-weight: 700;
  cursor: pointer;
  transition: 0.2s ease;
}

.lang-btn.active {
  background: rgba(56, 189, 248, 0.16);
  color: #dff6ff;
  box-shadow: inset 0 0 0 1px rgba(56, 189, 248, 0.24);
}

.hero {
  padding: 28px;
  border-radius: 28px;
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.96), rgba(15, 23, 42, 0.88));
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.hero-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; margin-bottom: 16px; }
.hero-illustration {
  margin: 0;
  width: clamp(84px, 18vw, 120px);
  aspect-ratio: 1;
  border-radius: 20px;
  border: 1px solid rgba(56, 189, 248, 0.3);
  background: rgba(15, 23, 42, 0.75);
  padding: 14px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
}
.hero-illustration img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  filter: drop-shadow(0 8px 18px rgba(8, 47, 73, 0.55));
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.12);
  color: #bfeaff;
  border: 1px solid rgba(56, 189, 248, 0.2);
  font-size: 0.92rem;
}

.hero h1 { margin: 0; font-size: clamp(2rem, 6vw, 3.4rem); line-height: 1.04; }
.hero p { margin: 14px 0 0; max-width: 860px; line-height: 1.65; color: #cad7eb; }

.actions, .quick-links, .filters, .quiz-actions, .flashcard-actions, .results-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.primary-btn, .secondary-btn, .option-btn, .tab-btn, .pill-btn {
  border: 0;
  border-radius: 14px;
  min-height: 44px;
  padding: 12px 16px;
  cursor: pointer;
  transition: 0.2s ease;
}

.primary-btn { background: var(--accent); color: #062235; font-weight: 800; }
.primary-btn:hover, .option-btn:hover, .secondary-btn:hover, .tab-btn:hover, .pill-btn:hover, .lang-btn:hover { transform: translateY(-1px); }
.secondary-btn, .option-btn, .tab-btn, .pill-btn {
  background: rgba(148, 163, 184, 0.08);
  color: var(--text);
  border: 1px solid var(--line);
}
.option-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  text-align: left;
}
[dir='rtl'] .option-btn {
  text-align: right;
}
.option-status {
  font-weight: 800;
  font-size: 1rem;
}

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none !important;
}

.danger-btn {
  background: rgba(251, 113, 133, 0.12);
  border: 1px solid rgba(251, 113, 133, 0.28);
  color: #ffd3dc;
}

.secondary-note {
  background: rgba(56, 189, 248, 0.06);
  border-color: rgba(56, 189, 248, 0.18);
}

.pill-btn.active, .tab-btn.active, .option-btn.correct, .option-btn.selected { background: rgba(56, 189, 248, 0.12); border-color: rgba(56, 189, 248, 0.36); }
.option-btn.incorrect { background: rgba(251, 113, 133, 0.12); border-color: rgba(251, 113, 133, 0.32); }

.grid { display: grid; grid-template-columns: 300px 1fr; gap: 18px; margin-top: 18px; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 24px; box-shadow: var(--shadow); min-width: 0; }
.sidebar { padding: 18px; position: sticky; top: 92px; height: fit-content; min-width: 0; }
.sidebar h2, .content h2, .content h3, .content h4, .panel h3 { margin-top: 0; }
.nav-list { display: grid; gap: 10px; margin-top: 12px; }
.tab-btn { text-align: left; }
[dir='rtl'] .tab-btn, [dir='rtl'] .option-btn, [dir='rtl'] .source-card, [dir='rtl'] .card, [dir='rtl'] .rule-card, [dir='rtl'] .quiz-card, [dir='rtl'] .flashcard, [dir='rtl'] .lesson-detail { text-align: right; }
[dir='rtl'] .hero p,
[dir='rtl'] .lead,
[dir='rtl'] .muted,
[dir='rtl'] .card p,
[dir='rtl'] .rule-card p,
[dir='rtl'] .source-card p,
[dir='rtl'] .quiz-card p,
[dir='rtl'] .flashcard p,
[dir='rtl'] .lesson-detail p,
[dir='rtl'] .option-btn > span:first-child {
  direction: rtl;
  unicode-bidi: plaintext;
}
.tab-btn .small { display: block; margin-top: 4px; color: var(--muted); font-size: 0.88rem; }
.tab-btn.compact .small { display: none; }
.jump-return-wrap { margin-top: 12px; }
.return-jump-btn { width: 100%; }
.sidebar-note { margin-top: 16px; padding: 14px; border-radius: 18px; background: rgba(34, 197, 94, 0.08); border: 1px solid rgba(34, 197, 94, 0.2); }
.sidebar-note p { margin: 8px 0 0; color: #d6f5df; }
.resume-banner {
  position: sticky;
  top: 0;
  z-index: 30;
  margin: 0 auto 12px;
  padding: 12px 16px;
  max-width: 1100px;
  border-radius: 14px;
  border: 1px solid rgba(96, 165, 250, 0.35);
  background: rgba(30, 41, 59, 0.92);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.resume-banner__content p {
  margin: 4px 0 0;
  color: #cbd5e1;
  font-size: 0.95rem;
}
.resume-banner__actions {
  display: flex;
  align-items: center;
  gap: 8px;
}
.resume-banner__btn {
  border: 0;
  border-radius: 10px;
  padding: 8px 12px;
  cursor: pointer;
  font-weight: 600;
}
.resume-banner__btn.primary {
  background: #3b82f6;
  color: #fff;
}
.resume-banner__btn.secondary {
  background: rgba(248, 113, 113, 0.18);
  color: #fecaca;
}
.resume-banner__btn.ghost {
  background: transparent;
  color: #cbd5e1;
  font-size: 1.1rem;
  line-height: 1;
}
.content { padding: 18px; min-width: 0; }

.cards, .rules-grid, .stats-grid, .sources-grid { display: grid; gap: 14px; }
.cards { grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.rules-grid { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.stats-grid { grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); }
.sources-grid { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }

.card, .rule-card, .stat-card, .source-card, .quiz-card, .flashcard, .lesson-detail {
  padding: 18px;
  border-radius: 22px;
  background: rgba(15, 23, 42, 0.72);
  border: 1px solid var(--line);
  min-width: 0;
}

.card p, .rule-card p, .source-card p, .quiz-card p, .flashcard p, .lesson-detail p, .lead, .muted { color: var(--muted); }
.rule-card ul, .card ul, .source-card ul, .lesson-detail ul { margin: 10px 0 0; padding-left: 18px; }
[dir='rtl'] .rule-card ul, [dir='rtl'] .card ul, [dir='rtl'] .source-card ul, [dir='rtl'] .lesson-detail ul { padding-left: 0; padding-right: 18px; }

.rule-kind { display: inline-flex; padding: 6px 10px; border-radius: 999px; font-size: 0.82rem; margin-bottom: 10px; }
.rule-kind.must { background: rgba(34, 197, 94, 0.14); color: #c8f8d7; }
.rule-kind.prohibited { background: rgba(251, 113, 133, 0.14); color: #ffd3dc; }
.rule-kind.limit { background: rgba(245, 158, 11, 0.14); color: #ffe7b0; }
.rule-kind.note { background: rgba(56, 189, 248, 0.14); color: #bfeaff; }

.section-header { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; margin-bottom: 14px; }
.lesson-cards { margin-bottom: 16px; }
.lesson-card { display: flex; flex-direction: column; gap: 10px; }
.lesson-detail { display: grid; gap: 16px; }
.lesson-block { padding: 16px; border-radius: 18px; border: 1px solid var(--line); background: rgba(15, 23, 42, 0.55); }
.lesson-split { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.lesson-warning { border-color: rgba(245, 158, 11, 0.28); background: rgba(245, 158, 11, 0.08); }
.lesson-success { border-color: rgba(34, 197, 94, 0.28); background: rgba(34, 197, 94, 0.08); }
.lesson-stepper {
  display: grid;
  gap: 14px;
  padding: 16px;
  border-radius: 20px;
  border: 1px solid rgba(56, 189, 248, 0.22);
  background: rgba(56, 189, 248, 0.06);
}
.lesson-step-card {
  padding: 16px;
  border-radius: 18px;
  background: rgba(15, 23, 42, 0.78);
  border: 1px solid rgba(56, 189, 248, 0.18);
}
.lesson-highlight {
  margin-top: 12px;
  padding: 14px;
  border-radius: 14px;
  background: rgba(34, 197, 94, 0.08);
  border: 1px solid rgba(34, 197, 94, 0.18);
  color: #d6f5df;
  font-weight: 600;
}

.quiz-card h3, .flashcard h3 { margin-bottom: 8px; }
.options { display: grid; gap: 10px; margin: 18px 0; }
.option-btn { text-align: left; width: 100%; }
.quiz-progress-badge .quiz-progress-compact { display: none; }
.quiz-card-unified { display: grid; gap: 12px; }
.quiz-meta-row { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.quiz-type-badge {
  display: inline-flex;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(56, 189, 248, 0.36);
  background: rgba(56, 189, 248, 0.12);
  color: #bae6fd;
  font-weight: 700;
  font-size: 0.8rem;
}
.quiz-progress-pill {
  display: inline-flex;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.35);
  color: #cbd5e1;
  font-size: 0.8rem;
}
.quiz-question-title { margin: 0; line-height: 1.35; font-size: 1.16rem; color: #f8fafc; }
.quiz-reference-row { margin: 0; color: #94a3b8; font-size: 0.86rem; }
.quiz-option-list { margin: 0; }
.quiz-option-button { min-height: 48px; }
.quiz-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.quiz-listen-button { white-space: nowrap; }
.progress { height: 10px; border-radius: 999px; background: rgba(148, 163, 184, 0.12); overflow: hidden; margin: 14px 0 20px; }
.progress-bar { height: 100%; background: linear-gradient(90deg, var(--accent), #22d3ee); }
.flashcard { min-height: 220px; }
.flashcard-answer { margin-top: 14px; padding: 14px; border-radius: 16px; background: rgba(56, 189, 248, 0.08); border: 1px solid rgba(56, 189, 248, 0.18); }
.footer-note { margin-top: 16px; padding: 16px; border-radius: 18px; background: rgba(245, 158, 11, 0.08); border: 1px solid rgba(245, 158, 11, 0.22); color: #ffe7b0; }
.small { font-size: 0.9rem; }
.site-footer {
  width: min(100%, 862px);
  margin: 20px 0 0 auto;
  padding: 14px 4px calc(12px + var(--safe-bottom));
  border-top: 1px solid rgba(148, 163, 184, 0.24);
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.55;
}
.site-footer p { margin: 0; }
.site-footer p + p { margin-top: 4px; }
[dir='rtl'] .site-footer {
  margin: 20px auto 0 0;
  text-align: right;
}

@media (max-width: 920px) {
  :root { --header-height: 118px; }
  .grid { grid-template-columns: 1fr; }
  .sidebar { position: static; display: grid; gap: 12px; }
  .lesson-split { grid-template-columns: 1fr; }
  .hero-top, .section-header { flex-direction: column; align-items: stretch; }
  .topbar-inner { flex-direction: row; align-items: center; gap: 10px; }
  .topbar-actions { justify-content: flex-end; width: auto; gap: 8px; }
  .language-switcher { width: auto; justify-content: flex-start; }
  .lang-btn { flex: 0 0 auto; min-width: 0; }
  .topbar .primary-btn { width: auto; }
  .hero p { line-height: 1.5; }
  .nav-list {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: minmax(150px, 1fr);
    gap: 8px;
    overflow-x: auto;
    overflow-y: hidden;
    padding-bottom: 4px;
    scroll-snap-type: x proximity;
    -webkit-overflow-scrolling: touch;
  }
  .nav-list::-webkit-scrollbar { height: 6px; }
  .nav-list::-webkit-scrollbar-thumb { background: rgba(148, 163, 184, 0.35); border-radius: 999px; }
  .nav-list .tab-btn { min-height: 56px; scroll-snap-align: start; }
  .jump-return-wrap { margin-top: 8px; }
  .sidebar .sidebar-note { margin-top: 0; }
  .sidebar .sidebar-note.secondary-note { display: none; }
}

@media (max-width: 760px) {
  .app-shell {
    padding-bottom: calc(212px + var(--safe-bottom));
  }
  .site-footer {
    width: 100%;
    margin-top: 16px;
    padding-bottom: calc(14px + var(--safe-bottom));
  }

  .hero,
  .content,
  .sidebar,
  .card,
  .rule-card,
  .stat-card,
  .source-card,
  .quiz-card,
  .flashcard,
  .lesson-detail,
  .lesson-block,
  .lesson-stepper,
  .lesson-step-card,
  .footer-note,
  .sidebar-note {
    padding: 16px;
  }

  .cards,
  .rules-grid,
  .sources-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .resume-banner {
    flex-direction: column;
    align-items: flex-start;
    padding: 12px;
  }
  .resume-banner__actions {
    width: 100%;
    flex-wrap: wrap;
  }
}

@media (min-width: 641px) and (max-width: 900px) {
  :root { --header-height: 76px; }
  :root { --header-height: 88px; }
  .app-shell,
  .topbar-inner {
    width: min(1180px, calc(100vw - max(20px, calc(var(--safe-left) + var(--safe-right) + 20px))));
  }
  .hero,
  .content,
  .sidebar,
  .card,
  .rule-card,
  .stat-card,
  .source-card,
  .quiz-card,
  .flashcard,
  .lesson-detail,
  .lesson-block,
  .lesson-stepper,
  .lesson-step-card,
  .footer-note,
  .sidebar-note {
    padding: 16px;
  }
  .grid { gap: 14px; }
}

@media (max-width: 640px) {
  :root {
    --header-height: 112px;
    --mobile-toolbar-height: calc(82px + var(--safe-bottom));
  }

  .app-shell,
  .topbar-inner {
    width: min(1180px, calc(100vw - max(12px, calc(var(--safe-left) + var(--safe-right) + 12px))));
  }

  .app-shell {
    padding-top: calc(var(--header-height) + 10px + var(--safe-top));
    padding-bottom: calc(24px + var(--mobile-toolbar-height));
  }

  .grid { gap: 12px; margin-top: 12px; }

  .hero,
  .content,
  .sidebar,
  .card,
  .rule-card,
  .stat-card,
  .source-card,
  .quiz-card,
  .flashcard,
  .lesson-detail,
  .lesson-block,
  .lesson-stepper,
  .lesson-step-card,
  .footer-note,
  .sidebar-note {
    padding: 12px;
    border-radius: 16px;
  }

  .section-header { margin-bottom: 10px; gap: 8px; }
  .options { margin: 12px 0; gap: 8px; }
  .option-btn { min-height: 46px; padding: 10px 12px; }
  .option-btn > span:first-child { font-size: 1rem; line-height: 1.35; }
  .quiz-card h3 { margin-bottom: 6px; }
  .quiz-actions { gap: 8px; }
  .quiz-section { padding-bottom: calc(var(--mobile-toolbar-height) + var(--quiz-bottom-clearance) + 8px); }
  .mobile-floating-toolbar { display: flex; }

  .mobile-floating-toolbar .a11y-settings-trigger,
  .mobile-floating-toolbar .voice-control-wrap,
  .mobile-floating-toolbar .keyboard-help-wrap {
    position: static !important;
    left: auto !important;
    right: auto !important;
    bottom: auto !important;
    transform: none !important;
    width: auto !important;
    max-width: none !important;
    margin: 0;
    box-shadow: none;
    background: transparent;
    border: 0;
    padding: 0;
    gap: 6px;
  }

  .mobile-floating-toolbar .voice-control-bubble,
  .mobile-floating-toolbar .voice-control-help,
  .mobile-floating-toolbar .keyboard-help-dialog,
  .mobile-floating-toolbar .keyboard-status-bubble {
    display: none !important;
  }

  .mobile-floating-toolbar .a11y-settings-trigger,
  .mobile-floating-toolbar .voice-control-btn,
  .mobile-floating-toolbar .voice-control-help-toggle,
  .mobile-floating-toolbar .keyboard-help-toggle {
    min-height: 40px;
    padding: 8px 11px;
    border-radius: 999px;
    white-space: nowrap;
  }

  .mobile-floating-toolbar .voice-control-actions {
    flex-wrap: nowrap;
    gap: 6px;
  }

  .a11y-settings-panel {
    bottom: calc(var(--mobile-toolbar-height) + 12px);
  }
}

@media (min-width: 901px) {
  :root { --mobile-toolbar-height: 0px; --quiz-bottom-clearance: 0px; }
}


@media (min-width: 481px) and (max-width: 900px) {
  :root { --quiz-bottom-clearance: 118px; }
}

@media (max-width: 480px) {
  :root { --quiz-bottom-clearance: 0px; }
}

@media (max-width: 600px) {
  .topbar-inner { flex-direction: row; align-items: center; }
  .brand-subtitle { white-space: normal; }
  .hero-illustration {
    width: clamp(72px, 28vw, 96px);
    padding: 12px;
  }
  .section-header > .primary-btn,
  .section-header > .secondary-btn {
    width: 100%;
  }
  .nav-list {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 4px;
  }
  .nav-list .tab-btn {
    flex: 0 0 auto;
    min-width: 132px;
    max-width: 180px;
  }
}

@media (min-width: 390px) and (max-width: 600px) {
  .actions .primary-btn,
  .actions .secondary-btn,
  .quick-links .primary-btn,
  .quick-links .secondary-btn,
  .filters .pill-btn,
  .quiz-actions .primary-btn,
  .quiz-actions .secondary-btn,
  .flashcard-actions .primary-btn,
  .flashcard-actions .secondary-btn,
  .results-actions .primary-btn,
  .results-actions .secondary-btn {
    flex: 1 1 calc(50% - 12px);
    min-width: 140px;
  }
}

@media (max-width: 390px) {
  .app-shell,
  .topbar-inner {
    width: min(1180px, calc(100vw - max(16px, calc(var(--safe-left) + var(--safe-right) + 16px))));
  }

  .hero,
  .content,
  .sidebar,
  .card,
  .rule-card,
  .stat-card,
  .source-card,
  .quiz-card,
  .flashcard,
  .lesson-detail,
  .lesson-block,
  .lesson-stepper,
  .lesson-step-card,
  .footer-note,
  .sidebar-note {
    padding: 14px;
  }

  .brand-subtitle { font-size: 0.8rem; }
  .hero h1 { font-size: clamp(1.45rem, 8vw, 2rem); line-height: 1.12; }
  .hero p { margin-top: 10px; font-size: 0.95rem; line-height: 1.45; }
  .badge { padding: 6px 10px; font-size: 0.82rem; }
  .section-header { margin-bottom: 10px; }
  .lead { font-size: 0.95rem; margin-top: 8px; }
  .small { font-size: 0.84rem; }

  .primary-btn,
  .secondary-btn,
  .option-btn,
  .tab-btn,
  .pill-btn {
    width: 100%;
    justify-content: center;
    min-height: 44px;
    padding: 10px 12px;
    border-radius: 12px;
  }

  .nav-list {
    grid-auto-columns: minmax(130px, 1fr);
    gap: 6px;
    padding-bottom: 2px;
  }

  .tab-btn.compact {
    width: auto;
    justify-content: center;
    white-space: nowrap;
    min-height: 42px;
    padding: 9px 11px;
  }

  .language-switcher {
    padding: 4px;
  }

  .actions, .quick-links, .filters, .quiz-actions, .flashcard-actions, .results-actions {
    gap: 8px;
    flex-direction: column;
  }

  .stats-grid { grid-template-columns: 1fr; gap: 10px; }
  .cards, .rules-grid, .sources-grid { grid-template-columns: 1fr; gap: 10px; }
  .flashcard { min-height: 0; }
}

@media (max-width: 720px) and (max-height: 540px) {
  .hero {
    padding: 18px;
  }
  .hero h1 {
    font-size: clamp(1.35rem, 6vw, 1.9rem);
  }
  .grid {
    gap: 10px;
  }
  .nav-list .tab-btn {
    min-height: 44px;
    padding: 8px 10px;
  }
}

@media (min-width: 680px) and (max-width: 920px) and (min-height: 760px) {
  :root { --header-height: 84px; }
  .grid { grid-template-columns: 280px 1fr; }
  .sidebar { position: sticky; top: calc(98px + var(--safe-top)); }
  .lesson-split { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero-top, .section-header, .topbar-inner { flex-direction: row; align-items: flex-start; }
  .topbar-inner { align-items: center; }
  .topbar-actions { width: auto; justify-content: flex-end; }
  .language-switcher { width: auto; justify-content: flex-start; }
  .lang-btn, .topbar .primary-btn { width: auto; flex: 0 1 auto; }
}

@media (min-width: 600px) and (max-width: 920px) and (max-height: 540px) {
  :root { --header-height: 72px; }
  .topbar-inner { gap: 8px; padding: 10px 0; }
  .brand-subtitle { font-size: 0.8rem; }
  .hero { padding: 22px; }
  .hero h1 { font-size: clamp(1.7rem, 4vw, 2.4rem); }
  .grid { gap: 14px; }
}

.search-input {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(15, 23, 42, 0.75);
  color: var(--text);
  padding: 10px 12px;
  margin-top: 8px;
}

.search-input:focus-visible,
.option-btn:focus-visible,
.secondary-btn:focus-visible,
.primary-btn:focus-visible,
.tab-btn:focus-visible,
.sign-option-btn:focus-visible,
.pill-btn:focus-visible,
.lang-btn:focus-visible,
.resume-banner__btn:focus-visible,
.a11y-settings-trigger:focus-visible,
.a11y-settings-panel button:focus-visible,
.a11y-settings-panel input:focus-visible,
.voice-control-btn:focus-visible,
.voice-control-help-toggle:focus-visible,
.keyboard-help-toggle:focus-visible,
a:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
  box-shadow: 0 0 0 3px var(--focus-ring-shadow);
}

.a11y-settings-trigger {
  position: fixed;
  inset-inline-start: max(12px, var(--safe-left));
  inset-inline-end: auto;
  bottom: calc(86px + var(--safe-bottom));
  z-index: 1200;
}

.mobile-floating-toolbar {
  position: fixed;
  inset-inline-start: max(10px, var(--safe-left));
  inset-inline-end: max(10px, var(--safe-right));
  bottom: max(10px, var(--safe-bottom));
  z-index: 1260;
  display: none;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px;
  border-radius: 16px;
  border: 1px solid rgba(148, 163, 184, 0.26);
  background: rgba(2, 6, 23, 0.88);
  backdrop-filter: blur(14px);
  box-shadow: 0 18px 38px rgba(2, 6, 23, 0.4);
}

[dir='rtl'] .mobile-floating-toolbar {
  flex-direction: row-reverse;
}

.mobile-floating-toolbar__slot {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
}

.a11y-settings-panel {
  position: fixed;
  inset-inline-start: max(12px, var(--safe-left));
  inset-inline-end: auto;
  bottom: calc(72px + var(--safe-bottom));
  width: min(380px, calc(100vw - 24px));
  max-height: min(68vh, 620px);
  overflow-y: auto;
  z-index: 1110;
  padding: 14px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(15, 23, 42, 0.96);
  box-shadow: var(--shadow);
  display: grid;
  gap: 10px;
}

.voice-control-help[hidden],
.keyboard-help-dialog[hidden],
.a11y-settings-panel[hidden] {
  display: none !important;
}

.a11y-settings-head,
.a11y-settings-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.a11y-settings-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.96rem;
}
[dir='rtl'] .a11y-settings-row {
  flex-direction: row-reverse;
  justify-content: flex-end;
}
.a11y-settings-row input[type='checkbox'] {
  inline-size: 18px;
  block-size: 18px;
  margin: 0;
  accent-color: var(--accent);
  cursor: pointer;
}

.a11y-settings-note {
  margin-top: 4px;
  padding: 10px;
  border-radius: 12px;
  border: 1px solid rgba(148, 163, 184, 0.22);
  background: rgba(2, 6, 23, 0.34);
}

.a11y-settings-note p {
  margin: 6px 0 0;
  color: #c8d8ee;
  line-height: 1.45;
}

@media (max-width: 720px) {
  .a11y-settings-trigger {
    bottom: calc(64px + var(--safe-bottom));
  }
  .a11y-settings-panel {
    inset-inline-start: max(12px, var(--safe-left));
    inset-inline-end: max(12px, var(--safe-right));
    width: auto;
    max-height: 70vh;
    bottom: calc(72px + var(--safe-bottom));
  }
}

@media (max-width: 640px) {
  .a11y-settings-panel {
    bottom: calc(var(--mobile-toolbar-height) + 12px);
  }
}


:root.a11y-large-text {
  font-size: 116%;
}

:root.a11y-large-text body {
  line-height: 1.7;
}

:root.a11y-large-text .primary-btn,
:root.a11y-large-text .secondary-btn,
:root.a11y-large-text .option-btn,
:root.a11y-large-text .tab-btn,
:root.a11y-large-text .card,
:root.a11y-large-text .panel {
  line-height: 1.6;
}

:root.a11y-simplified {
  --shadow: none;
  --panel: #111827;
  --panel-strong: #0f172a;
}

:root.a11y-simplified *,
:root.a11y-simplified *::before,
:root.a11y-simplified *::after {
  text-shadow: none !important;
  box-shadow: none !important;
  background-image: none !important;
}

:root.a11y-simplified .card,
:root.a11y-simplified .panel,
:root.a11y-simplified .hero,
:root.a11y-simplified .sign-card,
:root.a11y-simplified .lesson-signs-wrap,
:root.a11y-simplified .quiz-card {
  background: var(--panel) !important;
  border-color: var(--line) !important;
}

:root.a11y-reduced-motion *,
:root.a11y-reduced-motion *::before,
:root.a11y-reduced-motion *::after {
  transition: none !important;
  animation: none !important;
  scroll-behavior: auto !important;
}

:root.a11y-high-contrast {
  --bg: #000;
  --panel: #0b0b0b;
  --panel-strong: #000;
  --line: rgba(255, 255, 255, 0.72);
  --text: #fff;
  --muted: #dbe4ef;
  --accent: #ffea00;
  --accent-2: #c8ff46;
  --focus-ring: #fef08a;
  --focus-ring-shadow: rgba(254, 240, 138, 0.5);
}

:root.a11y-high-contrast body {
  background: #000 !important;
  color: #fff !important;
}

:root.a11y-high-contrast .panel,
:root.a11y-high-contrast .card,
:root.a11y-high-contrast .hero,
:root.a11y-high-contrast .a11y-settings-panel,
:root.a11y-high-contrast .keyboard-help-wrap,
:root.a11y-high-contrast .voice-control-wrap {
  background: #0b0b0b !important;
  border-color: rgba(255, 255, 255, 0.75) !important;
}

:root.a11y-high-contrast .secondary-btn,
:root.a11y-high-contrast .option-btn,
:root.a11y-high-contrast .tab-btn,
:root.a11y-high-contrast .pill-btn {
  background: #111 !important;
  color: #fff !important;
  border-color: rgba(255, 255, 255, 0.76) !important;
}

:root.a11y-underline-links a {
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 2px;
}

.lesson-signs-wrap {
  display: grid;
  gap: 14px;
  padding: 14px;
  border-radius: 18px;
  border: 1px solid rgba(56, 189, 248, 0.2);
  background: linear-gradient(180deg, rgba(30, 41, 59, 0.7), rgba(15, 23, 42, 0.72));
}

.sign-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 280px));
  justify-content: start;
  gap: 14px;
}

.sign-card {
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 12px;
  padding: 14px;
  border-radius: 16px;
  border: 1px solid rgba(148, 163, 184, 0.22);
  background: rgba(15, 23, 42, 0.82);
  min-height: 280px;
}

.sign-card-media {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 132px;
  border-radius: 14px;
  background: radial-gradient(circle at center, rgba(255, 255, 255, 0.92), rgba(241, 245, 249, 0.98));
  border: 1px solid rgba(148, 163, 184, 0.28);
}

.sign-image {
  width: min(100%, 132px);
  height: auto;
  max-height: 118px;
  object-fit: contain;
}

.sign-card-body {
  display: grid;
  gap: 8px;
  align-content: start;
}

.sign-card-body h5 {
  margin: 0;
  font-size: 1.06rem;
  color: #f8fbff;
}

.sign-category {
  display: inline-flex;
  width: fit-content;
  padding: 4px 9px;
  border-radius: 999px;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: #d6ecff;
  border: 1px solid rgba(56, 189, 248, 0.35);
  background: rgba(56, 189, 248, 0.14);
}

.sign-meaning,
.sign-action {
  margin: 0;
  color: #d5e4f8;
  line-height: 1.45;
}

.sign-meaning strong,
.sign-action strong {
  color: #f1f6ff;
}

.lesson-sign-quiz {
  display: grid;
  gap: 12px;
}

.lesson-official-links {
  margin-top: 14px;
}

.lesson-mini-quiz {
  display: grid;
  gap: 12px;
  margin-top: 14px;
  padding: 14px;
  border-radius: 16px;
  border: 1px solid rgba(56, 189, 248, 0.2);
  background: rgba(15, 23, 42, 0.72);
}

.sign-quiz-card {
  display: grid;
  gap: 12px;
}

.sign-quiz-meta {
  display: grid;
  gap: 8px;
}

.sign-quiz-scoreline {
  font-size: 0.92rem;
}

.sign-quiz-picture {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 220px;
}

.sign-quiz-image {
  justify-self: center;
  width: min(100%, 300px);
  max-height: 260px;
  object-fit: contain;
}

.sign-option-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  text-align: left;
  min-height: 56px;
}

.sign-option-btn.correct {
  border-color: rgba(34, 197, 94, 0.7);
  background: rgba(34, 197, 94, 0.18);
}

.sign-option-btn.incorrect {
  border-color: rgba(251, 113, 133, 0.72);
  background: rgba(251, 113, 133, 0.18);
}

.sign-answer-mark {
  font-weight: 800;
  color: #bbf7d0;
}

.sign-feedback.correct {
  border-color: rgba(34, 197, 94, 0.45);
  background: rgba(34, 197, 94, 0.14);
}

.sign-feedback.wrong {
  border-color: rgba(251, 113, 133, 0.5);
  background: rgba(251, 113, 133, 0.14);
}

.sign-image-warning {
  margin-top: -4px;
}

.sign-quiz-actions {
  flex-wrap: wrap;
}

.sign-option-btn:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.sign-tools {
  margin-bottom: 14px;
}

.sign-tools-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

@media (max-width: 720px) {
  .sign-grid {
    grid-template-columns: 1fr;
  }

  .sign-card {
    min-height: 0;
  }

  .sign-tools-grid {
    grid-template-columns: 1fr;
  }

  .sign-card-media {
    min-height: 120px;
  }

  .sign-quiz-picture {
    min-height: 180px;
  }

  .sign-quiz-image {
    max-height: 210px;
  }
}

@media (max-width: 390px) {
  .sign-card {
    padding: 12px;
  }

  .sign-card-media {
    min-height: 110px;
  }
}