/* ============================================================
   Español — Thème sombre, Mobile-first
   ============================================================ */

:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: #16213e;
  --bg-input: #1a1a3e;
  --accent: #e94560;
  --accent-hover: #ff6b7a;
  --gold: #f5a623;
  --success: #4ecca3;
  --warning: #f5a623;
  --danger: #e94560;
  --text: #eaeaea;
  --text-muted: #8892b0;
  --text-dim: #5a6380;
  --border: #2a2a4a;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 20px rgba(0,0,0,0.3);
  --transition: 0.2s ease;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --nav-height: 64px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  user-select: none;
  position: fixed;
  width: 100%;
}

/* ============================================================
   Layout
   ============================================================ */

#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  padding-top: var(--safe-top);
  padding-bottom: var(--safe-bottom);
}

#header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  min-height: 52px;
  flex-shrink: 0;
}

#header h1 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent);
}

#header .header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.back-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.4rem;
  cursor: pointer;
  padding: 4px 8px;
  display: flex;
  align-items: center;
}

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

#content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 8px;
}

#nav {
  display: flex;
  justify-content: space-around;
  align-items: center;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  height: var(--nav-height);
  flex-shrink: 0;
  padding-bottom: var(--safe-bottom);
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 8px 12px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.65rem;
  cursor: pointer;
  transition: color var(--transition);
  min-width: 56px;
}

.nav-item svg { width: 24px; height: 24px; }

.nav-item.active { color: var(--accent); }
.nav-item:hover { color: var(--text); }

/* ============================================================
   Écran d'accueil
   ============================================================ */

.home-screen { padding: 16px; }

.hero-card {
  background: linear-gradient(135deg, var(--accent), #c73e54);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
  text-align: center;
  box-shadow: var(--shadow);
}

.hero-card .due-count {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 4px;
}

.hero-card .due-label {
  font-size: 0.9rem;
  opacity: 0.9;
  margin-bottom: 16px;
}

.btn-start {
  display: inline-block;
  background: rgba(255,255,255,0.2);
  color: #fff;
  border: 2px solid rgba(255,255,255,0.4);
  padding: 12px 32px;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}

.btn-start:hover {
  background: rgba(255,255,255,0.3);
}

.streak-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  margin-bottom: 20px;
  font-size: 0.95rem;
}

.streak-bar .streak-fire { font-size: 1.3rem; }
.streak-bar .streak-num { color: var(--gold); font-weight: 700; }

.section-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 12px;
  margin-top: 8px;
}

/* Niveaux */
.levels-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 20px;
}

.level-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 16px;
  cursor: pointer;
  transition: all var(--transition);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.level-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.level-card.locked { opacity: 0.5; pointer-events: none; }

.level-card .level-name {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 2px;
}

.level-card .level-name.a1 { color: var(--success); }
.level-card .level-name.a2 { color: #5dade2; }
.level-card .level-name.b1 { color: var(--gold); }
.level-card .level-name.b2 { color: var(--accent); }

.level-card .level-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.level-card .level-progress-text {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.progress-bar {
  width: 100%;
  height: 6px;
  background: var(--bg-primary);
  border-radius: 3px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.5s ease;
}

.progress-bar-fill.a1 { background: var(--success); }
.progress-bar-fill.a2 { background: #5dade2; }
.progress-bar-fill.b1 { background: var(--gold); }
.progress-bar-fill.b2 { background: var(--accent); }

/* Stats du jour */
.today-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 16px;
}

.stat-box {
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  padding: 12px 8px;
  text-align: center;
}

.stat-box .stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
}

.stat-box .stat-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ============================================================
   Écran de sélection de catégories (niveau)
   ============================================================ */

.level-screen { padding: 16px; }

.level-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.level-header .level-badge {
  font-size: 1.8rem;
  font-weight: 800;
}

.level-header .level-info h2 { font-size: 1.1rem; }
.level-header .level-info p { font-size: 0.8rem; color: var(--text-muted); }

.cat-list { display: flex; flex-direction: column; gap: 8px; }

.cat-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  cursor: pointer;
  border: 1px solid var(--border);
  transition: all var(--transition);
}

.cat-item:hover { border-color: var(--accent); }

.cat-item .cat-name {
  font-size: 0.95rem;
  font-weight: 500;
}

.cat-item .cat-count {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Bouton réviser tout le niveau */
.btn-review-all {
  display: block;
  width: 100%;
  padding: 14px;
  margin-bottom: 16px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition);
}

.btn-review-all:hover { background: var(--accent-hover); }

/* ============================================================
   Écran de révision (Flashcard)
   ============================================================ */

.review-screen {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 16px;
}

.review-progress {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.review-progress-bar {
  flex: 1;
  height: 4px;
  background: var(--bg-secondary);
  border-radius: 2px;
  margin: 0 12px;
  overflow: hidden;
}

.review-progress-bar-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.3s ease;
}

.flashcard {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 16px;
  cursor: pointer;
  border: 1px solid var(--border);
  text-align: center;
  min-height: 200px;
  transition: all var(--transition);
}

.flashcard:active { transform: scale(0.99); }

.flashcard .card-level-tag {
  font-size: 0.7rem;
  padding: 3px 10px;
  border-radius: 20px;
  font-weight: 600;
  margin-bottom: 8px;
  display: inline-block;
}

.tag-a1 { background: rgba(78,204,163,0.15); color: var(--success); }
.tag-a2 { background: rgba(93,173,226,0.15); color: #5dade2; }
.tag-b1 { background: rgba(245,166,35,0.15); color: var(--gold); }
.tag-b2 { background: rgba(233,69,96,0.15); color: var(--accent); }

.flashcard .card-category {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 16px;
}

.flashcard .card-word {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 8px;
  word-break: break-word;
}

.flashcard .card-divider {
  width: 60px;
  height: 2px;
  background: var(--border);
  margin: 16px auto;
}

.flashcard .card-translation {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--success);
  margin-bottom: 16px;
}

.flashcard .card-example {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 320px;
}

.flashcard .card-example .example-es {
  font-style: italic;
  color: var(--text);
  margin-bottom: 4px;
}

.flashcard .tap-hint {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 16px;
}

/* Boutons de réponse */
.answer-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.answer-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 12px 4px;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}

.answer-btn:active { transform: scale(0.95); }

.answer-btn .btn-label { font-size: 0.8rem; }
.answer-btn .btn-interval { font-size: 0.65rem; margin-top: 2px; opacity: 0.8; }

.answer-btn.again {
  background: rgba(233,69,96,0.15);
  color: var(--danger);
}
.answer-btn.again:hover { background: rgba(233,69,96,0.25); }

.answer-btn.hard {
  background: rgba(245,166,35,0.15);
  color: var(--warning);
}
.answer-btn.hard:hover { background: rgba(245,166,35,0.25); }

.answer-btn.good {
  background: rgba(78,204,163,0.15);
  color: var(--success);
}
.answer-btn.good:hover { background: rgba(78,204,163,0.25); }

.answer-btn.easy {
  background: rgba(93,173,226,0.15);
  color: #5dade2;
}
.answer-btn.easy:hover { background: rgba(93,173,226,0.25); }

/* Session terminée */
.session-complete {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  text-align: center;
  height: 100%;
}

.session-complete .complete-icon {
  font-size: 4rem;
  margin-bottom: 16px;
}

.session-complete h2 {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.session-complete p {
  color: var(--text-muted);
  margin-bottom: 24px;
}

.session-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  width: 100%;
  max-width: 300px;
  margin-bottom: 24px;
}

.session-stat {
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  padding: 12px;
  text-align: center;
}

.session-stat .stat-value {
  font-size: 1.4rem;
  font-weight: 700;
}

.session-stat .stat-label {
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* ============================================================
   Écran Parcourir
   ============================================================ */

.browse-screen { padding: 16px; }

.search-bar {
  display: flex;
  align-items: center;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0 12px;
  margin-bottom: 12px;
}

.search-bar svg { width: 20px; height: 20px; color: var(--text-dim); flex-shrink: 0; }

.search-bar input {
  flex: 1;
  background: none;
  border: none;
  color: var(--text);
  padding: 12px;
  font-size: 0.95rem;
  outline: none;
}

.search-bar input::placeholder { color: var(--text-dim); }

.filter-row {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  overflow-x: auto;
  padding-bottom: 4px;
  -webkit-overflow-scrolling: touch;
}

.filter-chip {
  white-space: nowrap;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
  background: var(--bg-secondary);
  color: var(--text-muted);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all var(--transition);
  flex-shrink: 0;
}

.filter-chip.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.filter-chip:hover:not(.active) { border-color: var(--text-muted); }

.word-list { display: flex; flex-direction: column; gap: 4px; }

.word-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: all var(--transition);
}

.word-item:hover { border-color: var(--border); }

.word-item .word-es {
  font-weight: 600;
  font-size: 0.95rem;
}

.word-item .word-fr {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.word-item .word-state {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.word-state.new { background: var(--text-dim); }
.word-state.learning { background: var(--warning); }
.word-state.review { background: var(--success); }
.word-state.relearning { background: var(--danger); }

/* ============================================================
   Écran Statistiques
   ============================================================ */

.stats-screen { padding: 16px; }

.stats-overview {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 24px;
}

.stats-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
  border: 1px solid var(--border);
}

.stats-card .stat-value {
  font-size: 1.8rem;
  font-weight: 700;
}

.stats-card .stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Graphique hebdo */
.week-chart {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 20px;
  border: 1px solid var(--border);
}

.week-chart h3 {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.chart-bars {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  height: 120px;
  gap: 8px;
}

.chart-bar-col {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  height: 100%;
  justify-content: flex-end;
}

.chart-bar {
  width: 100%;
  max-width: 32px;
  background: var(--accent);
  border-radius: 4px 4px 0 0;
  min-height: 2px;
  transition: height 0.5s ease;
}

.chart-bar.today { background: var(--success); }

.chart-bar-label {
  font-size: 0.65rem;
  color: var(--text-dim);
  margin-top: 6px;
}

.chart-bar-count {
  font-size: 0.65rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

/* Répartition par état */
.state-dist {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 16px;
  border: 1px solid var(--border);
  margin-bottom: 20px;
}

.state-dist h3 {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.state-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0;
}

.state-row:not(:last-child) { border-bottom: 1px solid var(--border); }

.state-row .state-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-right: 10px;
}

.state-row .state-name {
  flex: 1;
  font-size: 0.9rem;
}

.state-row .state-count {
  font-weight: 600;
}

/* ============================================================
   Écran Réglages
   ============================================================ */

.settings-screen { padding: 16px; }

.setting-group {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-bottom: 16px;
  overflow: hidden;
}

.setting-group-title {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 12px 16px 8px;
}

.setting-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-top: 1px solid var(--border);
}

.setting-item:first-child { border-top: none; }

.setting-item label {
  font-size: 0.9rem;
}

.setting-item input[type="number"] {
  width: 64px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 6px 8px;
  text-align: center;
  font-size: 0.9rem;
}

/* Toggle switch */
.toggle {
  position: relative;
  width: 48px;
  height: 28px;
  cursor: pointer;
}

.toggle input { display: none; }

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--bg-primary);
  border-radius: 14px;
  border: 1px solid var(--border);
  transition: all var(--transition);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 22px;
  height: 22px;
  background: var(--text-muted);
  border-radius: 50%;
  top: 2px;
  left: 2px;
  transition: all var(--transition);
}

.toggle input:checked + .toggle-slider {
  background: var(--accent);
  border-color: var(--accent);
}

.toggle input:checked + .toggle-slider::before {
  transform: translateX(20px);
  background: #fff;
}

/* Boutons d'action */
.btn-action {
  display: block;
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  transition: all var(--transition);
  margin-bottom: 10px;
}

.btn-action.primary { background: var(--accent); color: #fff; }
.btn-action.primary:hover { background: var(--accent-hover); }
.btn-action.secondary { background: var(--bg-card); color: var(--text); border: 1px solid var(--border); }
.btn-action.secondary:hover { border-color: var(--text-muted); }
.btn-action.danger { background: rgba(233,69,96,0.15); color: var(--danger); }
.btn-action.danger:hover { background: rgba(233,69,96,0.25); }

/* ============================================================
   Écran Ajouter une carte
   ============================================================ */

.add-card-screen { padding: 16px; }

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 12px;
  font-size: 0.95rem;
  font-family: inherit;
  outline: none;
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--accent);
}

.form-group textarea {
  resize: vertical;
  min-height: 80px;
}

.form-group select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%238892b0' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.form-group select option {
  background: var(--bg-card);
  color: var(--text);
}

/* ============================================================
   Modal / Overlay
   ============================================================ */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 20px;
  animation: fadeIn 0.2s ease;
}

.modal {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 24px;
  max-width: 360px;
  width: 100%;
  border: 1px solid var(--border);
  animation: slideUp 0.2s ease;
}

.modal h3 { margin-bottom: 12px; font-size: 1.1rem; }
.modal p { color: var(--text-muted); margin-bottom: 20px; font-size: 0.9rem; }

.modal-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

.modal-actions button {
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  border: none;
  font-weight: 600;
  cursor: pointer;
  font-size: 0.9rem;
}

.modal-actions .btn-cancel {
  background: var(--bg-secondary);
  color: var(--text-muted);
}

.modal-actions .btn-confirm {
  background: var(--accent);
  color: #fff;
}

/* ============================================================
   Toast / Notification
   ============================================================ */

.toast {
  position: fixed;
  bottom: calc(var(--nav-height) + 16px + var(--safe-bottom));
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-card);
  color: var(--text);
  padding: 12px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  font-size: 0.9rem;
  z-index: 200;
  animation: toastIn 0.3s ease, toastOut 0.3s ease 2.5s forwards;
  box-shadow: var(--shadow);
}

/* ============================================================
   Animations
   ============================================================ */

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@keyframes toastIn {
  from { transform: translateX(-50%) translateY(20px); opacity: 0; }
  to { transform: translateX(-50%) translateY(0); opacity: 1; }
}

@keyframes toastOut {
  from { transform: translateX(-50%) translateY(0); opacity: 1; }
  to { transform: translateX(-50%) translateY(20px); opacity: 0; }
}

.fade-in {
  animation: fadeIn 0.3s ease;
}

/* ============================================================
   Scrollbar (webkit)
   ============================================================ */

#content::-webkit-scrollbar { width: 4px; }
#content::-webkit-scrollbar-track { background: transparent; }
#content::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

/* ============================================================
   Empty state
   ============================================================ */

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  text-align: center;
  color: var(--text-muted);
}

.empty-state svg {
  width: 64px;
  height: 64px;
  margin-bottom: 16px;
  opacity: 0.3;
}

.empty-state p {
  font-size: 0.9rem;
}

/* ============================================================
   Import / Export
   ============================================================ */

.import-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition);
  margin-bottom: 16px;
}

.import-zone:hover { border-color: var(--accent); }

.import-zone p { color: var(--text-muted); font-size: 0.9rem; }

.hidden-input { display: none; }

/* ============================================================
   Responsive
   ============================================================ */

@media (min-width: 480px) {
  .levels-grid { grid-template-columns: repeat(4, 1fr); }
  .today-stats { grid-template-columns: repeat(3, 1fr); }
  .flashcard .card-word { font-size: 2.4rem; }
}

@media (min-width: 768px) {
  #app { max-width: 480px; margin: 0 auto; border-left: 1px solid var(--border); border-right: 1px solid var(--border); }
}