/* Aimík — hlavní stylesheet | dark mode default | mobile-first | Nunito */

/* ── 1. CSS Custom Properties ─────────────────────────────── */
:root {
  --bg-primary: #0f1117;
  --bg-secondary: #1a1b23;
  --bg-card: #22232d;
  --accent: #6c5ce7;
  --accent-hover: #5a4bd5;
  --text-primary: #f0f0f5;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --success: #34d058;
  --error: #e74c3c;
  --warning: #f39c12;
  --border: #2d2e3a;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --transition: 0.2s ease;
  --font: 'Nunito', sans-serif;
}

/* ── 2. Base reset a typografie ──────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--font); background: var(--bg-primary); color: var(--text-primary); min-height: 100vh; -webkit-font-smoothing: antialiased; }

/* ── 3. Screen routing (CSS-based, dle D-35) ─────────────── */
.screen { display: none; min-height: 100vh; }
.screen:not(.hidden) { display: flex; flex-direction: column; align-items: center; justify-content: center; }
#screen-setup { display: flex; flex-direction: column; align-items: center; justify-content: center; }
#screen-setup.hidden { display: none; }
.hidden { display: none !important; }

/* ── 4. Setup screen ─────────────────────────────────────── */
.setup-container { width: 100%; max-width: 480px; padding: 24px; }
.setup-title { font-size: 2.5rem; font-weight: 700; color: var(--accent); text-align: center; margin-bottom: 4px; }
.setup-tagline { font-size: 1.1rem; color: var(--text-secondary); text-align: center; margin-bottom: 32px; }

#setup-form label { display: block; font-size: 0.9rem; font-weight: 600; color: var(--text-secondary); margin-bottom: 6px; margin-top: 16px; }

#setup-form input {
  width: 100%; padding: 12px 16px;
  background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text-primary);
  font-family: var(--font); font-size: 1rem; outline: none;
  transition: border-color var(--transition);
}
#setup-form input:focus { border-color: var(--accent); }

/* Input skupina s tlačítkem viditelnosti tokenu */
.input-group { position: relative; display: flex; align-items: center; }
.input-group input { padding-right: 48px; }

/* Tlačítko ikony — touch target 44×44px (dle D-34) */
.btn-icon {
  position: absolute; right: 8px; background: none; border: none;
  color: var(--text-secondary); cursor: pointer; padding: 8px;
  min-width: 48px; min-height: 48px; display: flex; align-items: center; justify-content: center;
}
.btn-icon svg { width: 26px; height: 26px; }
.btn-icon:hover { color: var(--text-primary); }

/* Základní tlačítko — min výška 44px pro touch (dle D-34) */
.btn { display: block; width: 100%; padding: 14px; border: none; border-radius: var(--radius-sm); font-family: var(--font); font-size: 1rem; font-weight: 600; cursor: pointer; transition: all var(--transition); min-height: 44px; }
.btn-primary { background: var(--accent); color: white; margin-top: 24px; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-primary:active { transform: scale(0.97); }

/* Inline chybová hláška pod formulářem */
.error-message { color: var(--error); font-size: 0.9rem; margin-top: 12px; text-align: center; }

/* Instrukce pro získání GitHub PAT */
.setup-instructions { margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--border); }
.setup-instructions h2 { font-size: 1rem; color: var(--text-secondary); margin-bottom: 12px; }
.setup-instructions ol { padding-left: 20px; color: var(--text-muted); font-size: 0.85rem; line-height: 1.6; }
.setup-instructions li { margin-bottom: 8px; }

/* ── 5. Loading screen ───────────────────────────────────── */
.loading-container { text-align: center; }

/* Rotující CSS spinner */
.spinner { width: 48px; height: 48px; border: 4px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.8s linear infinite; margin: 0 auto 24px; }

@keyframes spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

.loading-text { font-size: 1.2rem; color: var(--text-secondary); }

/* ── 6. Home placeholder ─────────────────────────────────── */
/* Fixní hlavička nahoře */
.app-header { width: 100%; padding: 16px 20px; display: flex; justify-content: space-between; align-items: center; position: fixed; top: 0; z-index: 100; background: var(--bg-primary); }
.app-logo { font-size: 1.5rem; font-weight: 700; color: var(--accent); }
.home-content { display: flex; flex-direction: column; align-items: center; justify-content: center; flex: 1; padding-top: 80px; }
.placeholder-text { font-size: 1.1rem; color: var(--text-muted); }

/* ── 7. Sync indikátor (dle D-27, D-28) ─────────────────── */
.sync-indicator { width: 24px; height: 24px; transition: opacity var(--transition); }
.sync-indicator.syncing { animation: spin 1s linear infinite; }
.sync-indicator.success { color: var(--success); }
.sync-indicator.error { color: var(--error); }

/* ── 8. Toast notifikace (dle D-29) ─────────────────────── */
.toast-container { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%); z-index: 1000; }

.toast { padding: 12px 24px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text-primary); font-size: 0.9rem; box-shadow: var(--shadow); animation: toast-in 0.3s ease; }
.toast.error { border-color: var(--error); }

@keyframes toast-in {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── 9. Responsive — mobile-first (dle D-33) ────────────── */
@media (min-width: 768px) {
  .setup-container { padding: 32px; }
}

@media (min-width: 1024px) {
  .setup-container { max-width: 520px; }
}

/* ── 10. Session setup screen ────────────────────────────── */
.setup-session-content {
  width: 100%; max-width: 480px; padding: 80px 24px 24px;
}
.session-setup-title {
  font-size: 1.5rem; font-weight: 700; color: var(--text-primary);
  text-align: center; margin-bottom: 24px;
}
.setup-label {
  display: block; font-size: 0.9rem; font-weight: 600;
  color: var(--text-secondary); margin: 20px 0 8px;
}
/* Mřížka kategorií — 2 sloupce */
.category-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px;
}
/* Tlačítko kategorie — výběr jedné ze skupin slov */
.btn-category {
  padding: 12px; background: var(--bg-card); border: 2px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text-primary);
  font-family: var(--font); font-size: 0.9rem; cursor: pointer;
  min-height: 44px; transition: all var(--transition); text-align: center;
}
.btn-category.active { border-color: var(--accent); background: var(--bg-secondary); }
.btn-category:hover { border-color: var(--accent); }

/* Selektor délky a směru session */
.duration-selector, .direction-selector {
  display: flex; gap: 8px;
}
.btn-duration, .btn-direction {
  flex: 1; padding: 12px; background: var(--bg-card); border: 2px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text-primary);
  font-family: var(--font); font-size: 0.9rem; font-weight: 600;
  cursor: pointer; min-height: 44px; transition: all var(--transition); text-align: center;
}
.btn-duration.active, .btn-direction.active {
  border-color: var(--accent); background: var(--accent); color: white;
}

/* ── 11. Session header — Apple-style (UX-05) ────────────── */
/* Fixní header: progress bar přes celou šířku, pak controls row */
.session-header {
  width: 100%; position: fixed; top: 0; z-index: 100;
  background: var(--bg-primary);
  display: flex; flex-direction: column;
}
/* Progress bar track — plná šířka, bez zakulacení na krajích */
.progress-bar-container {
  width: 100%; height: 20px; background: var(--bg-card);
}
/* Vyplněná část — JS řídí šířku, CSS transition zajišťuje plynulý pohyb */
.progress-bar {
  height: 20px; width: 0%; background: var(--accent);
  transition: width 1s linear;
}
/* Řada s časem a tlačítkem */
.session-controls {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 16px 8px;
}
/* Odpočet — velký, tučný */
.session-time {
  font-size: 18px; font-weight: 800; color: var(--text-primary);
  font-variant-numeric: tabular-nums; letter-spacing: 0.02em;
}
/* Kruhové tlačítko ✕ — Apple styl */
.btn-session-close {
  width: 34px; height: 34px; border-radius: 50%;
  background: rgba(255, 255, 255, 0.08); border: none;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-secondary); cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}
.btn-session-close:hover {
  background: rgba(255, 255, 255, 0.16); color: var(--text-primary);
}
.btn-session-close:active { transform: scale(0.92); }

/* ── 12. Exercise area ───────────────────────────────────── */
/* Hlavní oblast pro obsah cvičení */
.exercise-content {
  width: 100%; max-width: 480px; padding: 80px 24px 24px;
  display: flex; flex-direction: column; align-items: center;
  min-height: 100vh; justify-content: center;
}
/* Pokyn pro cvičení (např. "Přelož do angličtiny") */
.exercise-prompt {
  font-size: 1rem; color: var(--text-secondary); margin-bottom: 8px; text-align: center;
}
/* Zobrazované slovo/fráze */
.exercise-word {
  font-size: 1.6rem; font-weight: 700; color: var(--text-primary);
  margin-bottom: 24px; text-align: center;
}

/* ── 13. Flashcard flip animace (z skills/css-card-flip.md — UX-02) ── */
/* Wrapper — definuje 3D prostor pro perspektivu */
.flashcard {
  width: 100%; max-width: 480px; height: 200px;
  perspective: 1000px; cursor: pointer; margin: 0 auto 24px;
}
/* Vnitřní kontejner — ten se otáčí */
.flashcard-inner {
  position: relative; width: 100%; height: 100%;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
}
/* Otočený stav — třída .flipped přidána přes JS */
.flashcard.flipped .flashcard-inner { transform: rotateY(180deg); }
/* Obě strany — společné styly, backface-visibility musí být na obou */
.flashcard-front, .flashcard-back {
  position: absolute; inset: 0; display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  backface-visibility: hidden; -webkit-backface-visibility: hidden;
  border-radius: var(--radius); padding: 24px;
  font-size: 1.4rem; font-weight: 600; text-align: center;
}
/* Přední strana — výchozí zobrazení */
.flashcard-front {
  background: var(--bg-card); color: var(--text-primary);
  border: 2px solid var(--accent);
}
/* Zadní strana — otočena o 180° v základním stavu */
.flashcard-back {
  background: var(--accent); color: #ffffff;
  transform: rotateY(180deg);
}
/* Badge s typem slova (Idiom, Fráze, atd.) */
.card-type {
  font-size: 0.75rem; font-weight: 400; opacity: 0.6;
  margin-top: 8px; text-transform: uppercase; letter-spacing: 0.05em;
}
/* Hint "klikni pro otočení" — zmizí po prvním kliknutí */
.flashcard-front::after {
  content: "Klikni pro otočení"; position: absolute; bottom: 12px;
  font-size: 0.7rem; opacity: 0.4;
}
.flashcard.flipped .flashcard-front::after,
.flashcard.was-flipped .flashcard-front::after { display: none; }

/* ── 14. Tlačítka odpovědí (Uměl / Neuměl) ──────────────── */
.answer-buttons {
  display: flex; gap: 12px; width: 100%; max-width: 480px;
}
/* Tlačítko "Uměl jsem" — zelené */
.btn-knew, .btn-didnt {
  flex: 1; padding: 18px; border: none; border-radius: var(--radius-sm);
  font-family: var(--font); font-size: 1.2rem; font-weight: 800;
  cursor: pointer; min-height: 56px; transition: all var(--transition);
  letter-spacing: 0.02em;
}
.btn-knew { background: var(--success); color: #0a1f0a; }
/* Tlačítko "Neuměl jsem" — červené */
.btn-didnt { background: var(--error); color: white; }
.btn-knew:active, .btn-didnt:active { transform: scale(0.97); }

/* ── 15. Multiple choice (EX-04) ─────────────────────────── */
/* Seznam možností odpovědí */
.mc-options {
  display: flex; flex-direction: column; gap: 10px;
  width: 100%; max-width: 480px;
}
/* Jedno tlačítko možnosti */
.btn-mc-option {
  width: 100%; padding: 15px 16px; background: var(--bg-card);
  border: 2px solid var(--border); border-radius: var(--radius-sm);
  color: var(--text-primary); font-family: var(--font); font-size: 1rem;
  font-weight: 700; cursor: pointer; min-height: 52px;
  transition: all var(--transition); text-align: left;
}
.btn-mc-option:hover { border-color: var(--accent); }
/* Správná odpověď — zelené zvýraznění */
.btn-mc-option.correct { border-color: var(--success); background: rgba(52, 208, 88, 0.15); color: var(--success); }
/* Špatná odpověď — červené zvýraznění */
.btn-mc-option.wrong { border-color: var(--error); background: rgba(231, 76, 60, 0.15); color: var(--error); }
/* Po zodpovězení — zakáže klikání na ostatní možnosti */
.btn-mc-option.disabled { pointer-events: none; opacity: 0.7; }

/* ── 16. Writing exercise (EX-05) ────────────────────────── */
.writing-container {
  width: 100%; max-width: 480px;
}
/* Textové pole pro psaní překladu */
.writing-input {
  width: 100%; padding: 14px 16px; background: var(--bg-secondary);
  border: 2px solid var(--border); border-radius: var(--radius-sm);
  color: var(--text-primary); font-family: var(--font); font-size: 1rem;
  outline: none; margin-bottom: 12px; transition: border-color var(--transition);
}
.writing-input:focus { border-color: var(--accent); }
/* Feedback po odeslání odpovědi */
.writing-feedback {
  padding: 12px; border-radius: var(--radius-sm); margin-top: 12px;
  font-weight: 600; text-align: center;
}
/* Přesná shoda */
.writing-feedback.correct { background: rgba(52, 208, 88, 0.15); color: var(--success); }
/* Téměř správně (Levenshtein distance <= 2) */
.writing-feedback.almost { background: rgba(243, 156, 18, 0.15); color: var(--warning); }
/* Špatně */
.writing-feedback.wrong { background: rgba(231, 76, 60, 0.15); color: var(--error); }

/* ── 17. Results screen (EX-08) ──────────────────────────── */
.results-content {
  width: 100%; max-width: 480px; padding: 24px; text-align: center;
}
.results-title {
  font-size: 1.8rem; font-weight: 700; color: var(--text-primary); margin-bottom: 32px;
}
/* Mřížka výsledkových karet — 3 sloupce */
.results-stats {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-bottom: 32px;
}
/* Karta s jedním výsledkem */
.result-card {
  background: var(--bg-card); border-radius: var(--radius); padding: 20px 12px;
  display: flex; flex-direction: column; gap: 8px;
}
/* Akcentová varianta karty (XP) */
.result-card.accent { background: var(--accent); }
.result-value {
  font-size: 1.5rem; font-weight: 700; color: var(--text-primary);
}
.result-card.accent .result-value { color: white; }
.result-label {
  font-size: 0.8rem; color: var(--text-secondary); text-transform: uppercase;
}
.result-card.accent .result-label { color: rgba(255,255,255,0.8); }
/* Akce po skončení session */
.results-actions {
  display: flex; flex-direction: column; gap: 12px;
}
/* Sekundární tlačítko (Zpět domů) */
.btn-secondary {
  background: var(--bg-card); color: var(--text-primary); border: 1px solid var(--border);
  display: block; width: 100%; padding: 14px; border-radius: var(--radius-sm);
  font-family: var(--font); font-size: 1rem; font-weight: 600;
  cursor: pointer; min-height: 44px; transition: all var(--transition);
}
.btn-secondary:hover { border-color: var(--accent); }
/* Velké tlačítko pro hlavní výzvu k akci */
.btn-large { font-size: 1.1rem; padding: 18px; max-width: 320px; }

/* ── 18. Responsive rozšíření pro cvičební obrazovky ────── */
@media (min-width: 768px) {
  .setup-session-content { padding: 80px 32px 32px; }
  .results-content { padding: 32px; }
}

/* ── 19. Light mode overrides (UX-01) ─────────────────────── */
[data-theme="light"] {
  --bg-primary: #f5f5fa;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --text-primary: #1a1b23;
  --text-secondary: #4b5563;
  --text-muted: #9ca3af;
  --border: #e5e7eb;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}

/* ── 20. Theme toggle (UX-01) ─────────────────────────────── */
.theme-toggle {
  width: 34px; height: 34px; border-radius: 50%;
  background: rgba(255,255,255,0.08); border: none;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-secondary); cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}
.theme-toggle:hover { background: rgba(255,255,255,0.16); color: var(--text-primary); }
.theme-toggle:active { transform: scale(0.92); }
/* V light mode upravíme pozadí tlačítka */
[data-theme="light"] .theme-toggle { background: rgba(0,0,0,0.06); }
[data-theme="light"] .theme-toggle:hover { background: rgba(0,0,0,0.12); }
/* Slunce viditelné v dark mode, měsíc v light mode */
.icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

/* ── 21. Dashboard layout ────────────────────────────────── */
.dashboard-content {
  width: 100%; max-width: 480px; padding: 80px 16px 32px;
  display: flex; flex-direction: column; gap: 16px;
  margin: 0 auto;
}
.dashboard-greeting .greeting-heading {
  font-size: 1.75rem; font-weight: 700; color: var(--text-primary);
}
.dashboard-greeting .greeting-sub {
  font-size: 1rem; color: var(--text-secondary); margin-top: 4px;
}

/* ── 22. Overall progress card (DASH-01, DASH-02) ────────── */
.overall-progress-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px;
}
.progress-label {
  font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--text-secondary); display: block; margin-bottom: 8px;
}
.progress-percent {
  font-size: 1.75rem; font-weight: 700; color: var(--accent); display: block;
}
.srs-breakdown {
  display: flex; gap: 16px; margin-top: 12px;
}
.srs-stat { display: flex; flex-direction: column; }
.srs-stat-value { font-size: 1.25rem; font-weight: 700; }
.srs-stat-label { font-size: 0.8rem; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.05em; }
.srs-stat--mastered .srs-stat-value { color: var(--success); }
.srs-stat--active .srs-stat-value { color: var(--text-primary); }
.srs-stat--new .srs-stat-value { color: var(--text-muted); }

/* ── 23. Level XP card (DASH-04, GAMIF-02) ────────────────── */
.level-xp-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px;
}
.level-header {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 12px;
}
.level-heading {
  font-size: 1.25rem; font-weight: 700; color: var(--text-primary);
}
.level-badge {
  background: var(--accent); color: #fff; font-size: 0.875rem;
  font-weight: 700; padding: 4px 8px; border-radius: 20px;
}
.xp-bar-track {
  height: 8px; background: var(--border); border-radius: 4px; overflow: hidden;
}
.xp-bar-fill {
  height: 8px; background: var(--accent); border-radius: 4px;
  width: 0%; transition: width 0.8s ease-out;
}
.xp-label {
  font-size: 0.875rem; color: var(--text-secondary); margin-top: 8px; display: block;
}

/* ── 24. Streak card (DASH-05) ────────────────────────────── */
.streak-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px; text-align: center;
}
.streak-number {
  font-size: 3rem; font-weight: 700; color: var(--text-primary); display: block;
}
.streak-unit {
  font-size: 1rem; color: var(--text-secondary); display: block;
}
.streak-card.broken .streak-number { color: var(--text-muted); }
.streak-card.broken .streak-unit { color: var(--text-muted); }
.streak-grace {
  display: inline-block; background: rgba(243,156,18,0.15); color: var(--warning);
  font-size: 0.875rem; padding: 4px 8px; border-radius: 6px; margin-top: 8px;
}

/* ── 25. Category list (DASH-03) ──────────────────────────── */
.section-heading {
  font-size: 1.25rem; font-weight: 700; color: var(--text-primary);
  margin-bottom: 12px;
}
.category-list { display: flex; flex-direction: column; gap: 8px; }
.category-row {
  display: flex; align-items: center; gap: 8px; padding: 16px;
  background: var(--bg-card); border-radius: var(--radius-sm);
  border: 1px solid var(--border); min-height: 56px; flex-wrap: wrap;
}
.category-emoji { font-size: 1.25rem; flex-shrink: 0; }
.category-name { font-size: 1rem; font-weight: 700; color: var(--text-primary); flex: 1; }
.category-words { font-size: 0.875rem; color: var(--text-secondary); }
.category-mastery { font-size: 0.875rem; font-weight: 700; margin-left: 8px; }
.category-mastery.high { color: var(--success); }
.category-mastery.mid { color: var(--text-primary); }
.category-mastery.low { color: var(--text-muted); }
.category-bar-track {
  width: 100%; height: 4px; background: var(--border); border-radius: 2px;
  flex-basis: 100%; margin-top: 4px;
}
.category-bar-fill {
  height: 4px; border-radius: 2px; width: 0%;
  transition: width 0.6s ease-out;
}
.category-bar-fill.high { background: var(--success); }
.category-bar-fill.mid { background: var(--accent); }

/* ── 26. Level-up overlay (GAMIF-03) ──────────────────────── */
.level-up-overlay {
  position: fixed; inset: 0; z-index: 500;
  background: rgba(15,17,23,0.9);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  cursor: pointer;
}
.level-up-overlay.hidden { display: none; }
.level-up-content {
  text-align: center; animation: level-up-pop 0.4s ease both;
}
.level-up-emoji { font-size: 3rem; display: block; margin-bottom: 16px; }
.level-up-heading {
  font-size: 1.75rem; font-weight: 700; color: var(--accent);
}
.level-up-body {
  font-size: 1rem; color: var(--text-secondary); margin-top: 8px;
}
@keyframes level-up-pop {
  0% { transform: scale(0.7); opacity: 0; }
  70% { transform: scale(1.05); }
  100% { transform: scale(1); opacity: 1; }
}

/* ── 27. CTA section ──────────────────────────────────────── */
.cta-section { padding-top: 8px; }

/* ── 28. Dashboard responsive ─────────────────────────────── */
@media (min-width: 768px) {
  .dashboard-content { padding: 80px 24px 32px; }
  .dashboard-greeting .greeting-heading { font-size: 2rem; }
}
@media (min-width: 1024px) {
  .dashboard-content { max-width: 520px; }
}

/* ── 29. Reduced motion ───────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .xp-bar-fill, .category-bar-fill { transition: none; }
  .level-up-content { animation: none; }
  .modal-panel { transition: none; }
}

/* ── 30. Hamburger navigace (D-01, D-02) ─────────────────── */
#hamburger-btn {
  position: fixed; top: 16px; left: 20px; z-index: 150;
  background: none; border: none; color: var(--text-secondary);
  cursor: pointer; padding: 8px; min-width: 44px; min-height: 44px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%; transition: background var(--transition), color var(--transition);
}
#hamburger-btn:hover { color: var(--text-primary); background: rgba(255,255,255,0.08); }
[data-theme="light"] #hamburger-btn:hover { background: rgba(0,0,0,0.06); }

.nav-menu {
  position: fixed; top: 56px; left: 0; right: 0; z-index: 300;
  background: var(--bg-secondary); border-bottom: 1px solid var(--border);
  display: flex; flex-direction: column;
  box-shadow: var(--shadow);
}
.nav-menu.hidden { display: none; }
.nav-item {
  padding: 16px 20px; background: none; border: none;
  border-bottom: 1px solid var(--border);
  color: var(--text-primary); font-family: var(--font); font-size: 1rem; font-weight: 600;
  text-align: left; cursor: pointer; min-height: 44px;
  transition: background var(--transition);
}
.nav-item:last-child { border-bottom: none; }
.nav-item:hover { background: var(--bg-card); }

.nav-overlay {
  position: fixed; inset: 0; z-index: 200;
  background: transparent;
}
.nav-overlay.hidden { display: none; }

/* ── 31. Modal overlay (ADMIN-01 az ADMIN-05) ────────────── */
.modal-overlay {
  position: fixed; inset: 0; z-index: 400;
  background: rgba(15, 17, 23, 0.85);
  display: flex; align-items: flex-end; justify-content: center;
  padding: 0;
}
.modal-overlay.hidden { display: none; }

.modal-panel {
  background: var(--bg-secondary); border-radius: var(--radius) var(--radius) 0 0;
  border: 1px solid var(--border); border-bottom: none;
  width: 100%; max-width: 480px; padding: 24px;
  max-height: 85vh; overflow-y: auto;
}

@media (min-width: 600px) {
  .modal-overlay { align-items: center; padding: 24px; }
  .modal-panel { border-radius: var(--radius); border-bottom: 1px solid var(--border); max-height: 90vh; }
}

.modal-header {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 20px;
}
.modal-title { font-size: 1.25rem; font-weight: 700; color: var(--text-primary); }

.modal-close-btn {
  position: static; background: none; border: none;
  color: var(--text-secondary); cursor: pointer; padding: 8px;
  min-width: 44px; min-height: 44px; display: flex; align-items: center; justify-content: center;
}
.modal-close-btn:hover { color: var(--text-primary); }

.modal-panel label {
  display: block; font-size: 0.9rem; font-weight: 600;
  color: var(--text-secondary); margin-bottom: 6px; margin-top: 16px;
}
.modal-panel label:first-of-type { margin-top: 0; }
.modal-panel input, .modal-panel select {
  width: 100%; padding: 12px 16px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text-primary);
  font-family: var(--font); font-size: 1rem; outline: none;
  transition: border-color var(--transition);
}
.modal-panel input:focus, .modal-panel select:focus { border-color: var(--accent); }

[data-theme="light"] .modal-overlay { background: rgba(0, 0, 0, 0.5); }

/* ── 32. Confirm dialog (ADMIN-03, ADMIN-05) ─────────────── */
.confirm-panel { text-align: center; max-width: 360px; }
.confirm-text {
  font-size: 1.1rem; font-weight: 600; color: var(--text-primary);
  margin-bottom: 20px; line-height: 1.5;
}
.confirm-actions { display: flex; gap: 12px; }
.confirm-btn { flex: 1; margin-top: 0; }

/* ── 33. Admin screen layout ─────────────────────────────── */
.admin-content {
  width: 100%; max-width: 480px; padding: 80px 16px 32px;
  display: flex; flex-direction: column; gap: 16px;
  margin: 0 auto;
}
.admin-title {
  font-size: 1.5rem; font-weight: 700; color: var(--text-primary);
}
.admin-actions { display: flex; gap: 8px; }
.admin-btn { flex: 1; margin-top: 0; font-size: 0.9rem; padding: 12px; }

/* Seznam slov pogroupovany podle kategorii */
.admin-word-list { display: flex; flex-direction: column; gap: 16px; }
.admin-category-group { }
.admin-category-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 0 8px; border-bottom: 1px solid var(--border);
}
.admin-category-name {
  font-size: 1rem; font-weight: 700; color: var(--text-primary);
}
.admin-category-actions { display: flex; gap: 4px; }
.admin-category-btn {
  background: none; border: none; color: var(--text-muted);
  cursor: pointer; padding: 4px 8px; font-size: 0.85rem;
  min-width: 36px; min-height: 36px; display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm); transition: color var(--transition), background var(--transition);
}
.admin-category-btn:hover { color: var(--text-primary); background: var(--bg-card); }

.admin-word-row {
  display: flex; align-items: center; gap: 8px; padding: 10px 12px;
  background: var(--bg-card); border-radius: var(--radius-sm);
  border: 1px solid var(--border); min-height: 48px;
  cursor: pointer; transition: border-color var(--transition);
}
.admin-word-row:hover { border-color: var(--accent); }
.admin-word-en { font-weight: 700; color: var(--text-primary); flex: 1; }
.admin-word-cs { color: var(--text-secondary); flex: 1; }
.admin-word-actions { display: flex; gap: 2px; flex-shrink: 0; }
.admin-word-btn {
  background: none; border: none; color: var(--text-muted);
  cursor: pointer; padding: 6px; min-width: 36px; min-height: 36px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm); transition: color var(--transition);
}
.admin-word-btn:hover { color: var(--text-primary); }
.admin-word-btn.delete:hover { color: var(--error); }