/* ── Variables ── */
:root {
  --primary: #4F46E5;
  --primary-dark: #3730A3;
  --primary-light: #EEF2FF;
  --primary-mid: #6366F1;
  --secondary: #7C3AED;
  --success: #10B981;
  --success-light: #D1FAE5;
  --warning: #F59E0B;
  --warning-light: #FEF3C7;
  --danger: #EF4444;
  --danger-light: #FEE2E2;
  --info: #3B82F6;
  --info-light: #DBEAFE;

  --bg: #F1F5F9;
  --card: #FFFFFF;
  --border: #E2E8F0;
  --border-light: #F1F5F9;

  --text: #1E293B;
  --text-muted: #64748B;
  --text-light: #94A3B8;
  --text-white: #FFFFFF;

  --shadow-xs: 0 1px 2px rgba(0, 0, 0, .06);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, .1), 0 1px 2px rgba(0, 0, 0, .06);
  --shadow: 0 4px 6px rgba(0, 0, 0, .07), 0 2px 4px rgba(0, 0, 0, .05);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, .1), 0 4px 10px rgba(0, 0, 0, .05);
  --shadow-xl: 0 20px 50px rgba(0, 0, 0, .15);

  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --nav-h: 64px;
  --surface: #FFFFFF;
  --text-secondary: #64748B;
}

[data-theme="dark"] {
  --surface: #253347;
  --text-secondary: #94A3B8;
}

/* ── Reset ── */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

button {
  cursor: pointer;
  font-family: inherit;
  border: none;
}

input,
select {
  font-family: inherit;
}

svg {
  display: block;
}

/* ── App shell ── */
.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ══════════════════════════════════════════ NAVBAR ══ */
.navbar {
  height: var(--nav-h);
  background: var(--card);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 200;
  box-shadow: var(--shadow-sm);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.brand-icon {
  font-size: 1.5rem;
}

.brand-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.3px;
}

.nav-tabs {
  display: flex;
  gap: 2px;
  flex: 1;
  overflow-x: auto;
  scrollbar-width: none;
}

.nav-tabs::-webkit-scrollbar {
  display: none;
}

.nav-tab {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s;
}

.nav-tab svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.nav-tab:hover {
  background: var(--primary-light);
  color: var(--primary);
}

.nav-tab.active {
  background: var(--primary);
  color: #fff;
}

.nav-end {
  flex-shrink: 0;
}

.streak-badge {
  display: flex;
  align-items: center;
  gap: 5px;
  background: linear-gradient(135deg, #FEF3C7, #FDE68A);
  border: 1px solid #F59E0B;
  color: #92400E;
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 700;
}

/* ══════════════════════════════════════════ MAIN ══ */
.main {
  flex: 1;
  width: 100%;
  padding: 28px clamp(20px, 4vw, 80px) 48px;
}

/* ── Tab panels ── */
.tab-panel {
  display: none;
}

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

/* ── Page header ── */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.page-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.5px;
}

.page-subtitle {
  font-size: 0.925rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ── Card ── */
.card {
  background: var(--card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.card-header {
  padding: 18px 20px 0;
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.card-body {
  padding: 16px 20px 20px;
}

/* ══════════════════════════════════════════ BUTTONS ══ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  transition: all 0.15s;
  border: 2px solid transparent;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.btn-primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
}

.btn-outline {
  background: var(--primary-light);
  color: var(--primary);
  border-color: var(--primary);
}

.btn-outline:hover {
  background: color-mix(in srgb, var(--primary) 18%, transparent);
}

.btn-success {
  background: var(--success);
  color: #fff;
  border-color: var(--success);
}

.btn-success:hover {
  background: #059669;
  border-color: #059669;
}

.btn-success.active {
  background: var(--warning);
  border-color: var(--warning);
}

.btn-warning {
  background: var(--warning);
  color: #fff;
  border-color: var(--warning);
}

.btn-warning:hover {
  background: #D97706;
  border-color: #D97706;
}

.btn-ghost {
  background: var(--surface);
  color: var(--text-muted);
  border-color: var(--border);
}

.btn-ghost:hover {
  background: var(--border-light);
  color: var(--text);
  border-color: var(--text-muted);
}

.btn-lg {
  padding: 13px 28px;
  font-size: 1rem;
  border-radius: var(--radius);
  margin-top: 24px;
}

/* ── Badge ── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--primary-light);
  color: var(--primary);
}

/* ── Misc ── */
.hidden {
  display: none !important;
}

.highlight {
  color: var(--primary);
  font-weight: 700;
}

/* ══════════════════════════════════════════ DASHBOARD ══ */

/* Dash top row */
.dash-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 20px;
}

.dash-greeting {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.3;
  margin-bottom: 2px;
}

/* Hero CTA card */
.hero-cta {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 22px 24px;
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  box-shadow: var(--shadow-lg);
  color: #fff;
}

.hero-cta:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.hero-cta.urgent {
  background: linear-gradient(135deg, #F59E0B, #EF4444);
}

.hero-cta.weak {
  background: linear-gradient(135deg, #3B82F6, #6366F1);
}

.hero-cta.ready {
  background: linear-gradient(135deg, #10B981, #059669);
}

.hero-cta-icon {
  font-size: 2.8rem;
  flex-shrink: 0;
  line-height: 1;
}

.hero-cta-body {
  flex: 1;
  min-width: 0;
}

.hero-cta-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: #fff;
}

.hero-cta-sub {
  font-size: 0.875rem;
  opacity: 0.88;
  color: #fff;
}

.hero-cta-btn {
  flex-shrink: 0;
  background: rgba(255, 255, 255, 0.95);
  color: var(--primary);
  border: none;
  border-radius: var(--radius);
  padding: 13px 22px;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
  transition: transform 0.12s, box-shadow 0.12s;
  box-shadow: 0 2px 8px rgba(0, 0, 0, .15);
}

.hero-cta-btn:hover {
  transform: scale(1.04);
  box-shadow: 0 4px 14px rgba(0, 0, 0, .2);
}

.hero-cta.urgent .hero-cta-btn {
  color: #D97706;
}

.hero-cta.weak .hero-cta-btn {
  color: #2563EB;
}

.hero-cta.ready .hero-cta-btn {
  color: #059669;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.stat-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  padding: 20px;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  box-shadow: var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}

.stat-icon.blue {
  background: var(--info-light);
}

.stat-icon.green {
  background: var(--success-light);
}

.stat-icon.purple {
  background: var(--primary-light);
}

.stat-icon.orange {
  background: var(--warning-light);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 4px;
}

.stat-value {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
}

.stat-sub {
  font-size: 0.75rem;
  color: var(--text-light);
  margin-top: 4px;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 16px;
}

/* Today goal */
.goal-wrap {}

.goal-label {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.goal-label span {
  font-weight: 700;
  color: var(--text);
}

.goal-track {
  height: 10px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 12px;
}

.goal-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 999px;
  transition: width 0.6s ease;
}

.goal-numbers {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Recent words */
.recent-card {
  margin-top: 16px;
}

.recent-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.recent-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 12px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.15s;
}

.recent-item:hover {
  background: var(--primary-light);
}

.recent-main {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.recent-word {
  font-weight: 700;
  color: var(--primary);
  font-size: 0.95rem;
}

.recent-phonetic {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.recent-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 3px;
}

.recent-meaning {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.recent-topic {
  font-size: 0.68rem;
  color: var(--text-muted);
  background: var(--border);
  border-radius: 999px;
  padding: 2px 8px;
  white-space: nowrap;
}

/* Quick actions */
.quick-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.quick-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 14px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: all 0.15s;
}

.quick-btn:hover {
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.quick-icon {
  font-size: 1.5rem;
}

/* ══════════════════════════════════════════ VOCABULARY ══ */
.vocab-toolbar {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
  align-items: center;
}

.search-wrap {
  position: relative;
  flex: 1;
  min-width: 200px;
}

.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--text-light);
}

.search-input {
  width: 100%;
  padding: 10px 12px 10px 38px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--card);
  color: var(--text);
  font-size: 0.875rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.search-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

.filter-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.select-input {
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--card);
  color: var(--text);
  font-size: 0.875rem;
  cursor: pointer;
  transition: border-color 0.15s;
}

.select-input:focus {
  outline: none;
  border-color: var(--primary);
}

.word-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
}

.word-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px;
  cursor: pointer;
  transition: all 0.15s;
  box-shadow: var(--shadow-xs);
  position: relative;
}

.word-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}

.word-card.learned {
  border-left: 3px solid var(--success);
}

.wc-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 6px;
}

.wc-word {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  flex: 1;
  min-width: 0;
}

.wc-meta-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.wc-phonetic {
  font-size: 0.75rem;
  color: var(--text-light);
}

.wc-type-tag {
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 999px;
  font-weight: 600;
  background: var(--primary-light);
  color: var(--primary);
}

.wc-level-tag {
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 999px;
  font-weight: 600;
}

.wc-level-tag.beginner {
  background: var(--success-light);
  color: #065F46;
}

.wc-level-tag.intermediate {
  background: var(--warning-light);
  color: #92400E;
}

.wc-level-tag.advanced {
  background: var(--danger-light);
  color: #991B1B;
}

.wc-meaning {
  font-size: 0.9rem;
  color: var(--text);
  font-weight: 500;
  margin-bottom: 10px;
}

.wc-example {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-style: italic;
  border-top: 1px solid var(--border-light);
  padding-top: 10px;
  margin-top: 4px;
  display: none;
}

.wc-example.visible {
  display: block;
}

.wc-example-vi {
  font-style: normal;
  color: var(--text-light);
  margin-top: 4px;
  font-size: 0.78rem;
}

.wc-expand-hint {
  font-size: 0.68rem;
  color: var(--text-muted);
  margin-top: 8px;
  opacity: 0.6;
  user-select: none;
}

.word-card.expanded .wc-expand-hint {
  display: none;
}

.word-card.expanded {
  background: var(--primary-light);
  border-color: var(--primary);
}

.wc-learn-btn {
  width: 28px;
  height: 28px;
  font-size: 1rem;
  line-height: 1;
  padding: 0;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-muted);
  cursor: pointer;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
}

.wc-learn-btn:hover {
  background: var(--success-light);
  border-color: var(--success);
  color: #065F46;
}

.wc-learn-btn.active {
  background: var(--success);
  color: #fff;
  border-color: var(--success);
}

/* ══════════════════════════════════════════ TOPICS TAB ══ */
.topic-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 18px;
}

.topic-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform 0.18s, box-shadow 0.18s;
}

.topic-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.tc-header {
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  position: relative;
}

.tc-emoji {
  font-size: 2rem;
  flex-shrink: 0;
}

.tc-info {
  flex: 1;
  min-width: 0;
}

.tc-name {
  font-size: 1.05rem;
  font-weight: 800;
  color: #fff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tc-total {
  font-size: 0.72rem;
  color: rgba(255, 255, 255, 0.8);
  margin-top: 2px;
}

.tc-pct-wrap {
  flex-shrink: 0;
  text-align: right;
}

.tc-pct {
  font-size: 1.3rem;
  font-weight: 800;
  color: rgba(255, 255, 255, .9);
}

.tc-due-badge {
  font-size: 0.65rem;
  background: rgba(255, 255, 255, 0.25);
  color: #fff;
  border-radius: 999px;
  padding: 2px 7px;
  margin-top: 4px;
  display: inline-block;
  white-space: nowrap;
}

.tc-body {
  padding: 16px;
}

.tc-progress-track {
  height: 6px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 12px;
}

.tc-progress-fill {
  height: 100%;
  border-radius: 999px;
  transition: width 0.6s ease;
}

.tc-stats {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  flex-wrap: wrap;
  gap: 6px;
}

.tc-learned {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text);
}

.tc-levels {
  display: flex;
  gap: 5px;
  flex-wrap: wrap;
}

.tc-lv {
  font-size: 0.68rem;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 999px;
}

.tc-lv-beg {
  background: var(--success-light);
  color: #065F46;
}

.tc-lv-mid {
  background: var(--warning-light);
  color: #92400E;
}

.tc-lv-adv {
  background: var(--danger-light);
  color: #991B1B;
}

.tc-actions {
  display: flex;
  gap: 8px;
}

.tc-btn-study {
  flex: 1;
  padding: 9px 14px;
  border-radius: var(--radius-sm);
  border: none;
  background: var(--primary);
  color: #fff;
  font-size: 0.825rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s;
}

.tc-btn-study:hover {
  background: var(--primary-dark);
}

.tc-btn-view {
  padding: 9px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 0.825rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.tc-btn-view:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}

/* Word list sub-view */
.tw-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.tw-back-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  flex-shrink: 0;
}

.tw-back-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.tw-title-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
}

.tw-accent {
  width: 4px;
  height: 40px;
  border-radius: 999px;
  flex-shrink: 0;
}

.tw-emoji {
  font-size: 1.6rem;
  flex-shrink: 0;
}

/* Dark mode */
[data-theme="dark"] .topic-card {
  background: var(--card);
  border-color: var(--border);
}

[data-theme="dark"] .tc-lv-beg {
  background: #064E3B;
  color: #6EE7B7;
}

[data-theme="dark"] .tc-lv-mid {
  background: #451A03;
  color: #FCD34D;
}

[data-theme="dark"] .tc-lv-adv {
  background: #450A0A;
  color: #FCA5A5;
}

[data-theme="dark"] .tw-back-btn {
  background: var(--card);
  border-color: var(--border);
}

/* ══════════════════════════════════════════ FLASHCARDS ══ */

/* Flashcard overlay — hiển thị trên bất kỳ tab nào */
#fcSession:not(.hidden),
#fcDone:not(.hidden) {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: var(--bg);
  overflow-y: auto;
  padding: 28px max(24px, calc((100vw - 680px) / 2)) 32px;
}

/* Result/done screens: center vertically on desktop */
#fcDone:not(.hidden) {
  display: flex;
  align-items: center;
  justify-content: center;
}

@media (max-width: 640px) {

  #fcSession:not(.hidden),
  #fcDone:not(.hidden) {
    padding: 16px 12px calc(74px + env(safe-area-inset-bottom, 0px));
    display: block;
  }
}

/* ══ Learn Session Overlay ═══════════════════════════════ */
#learnSession:not(.hidden) {
  position: fixed; inset: 0; z-index: 300;
  background: var(--bg); overflow-y: auto;
  display: flex; justify-content: center;
}

.ls-wrap {
  width: 100%; max-width: 480px;
  padding: 16px 20px 60px;
  display: flex; flex-direction: column; gap: 20px;
}

.ls-header { display: flex; align-items: center; gap: 12px; }
.ls-close {
  background: none; border: none; font-size: 1.1rem;
  cursor: pointer; color: var(--text-secondary); padding: 4px 8px; flex-shrink: 0;
}
.ls-prog-track { flex: 1; height: 6px; background: var(--border); border-radius: 3px; overflow: hidden; }
.ls-prog-fill  { height: 6px; background: var(--primary); border-radius: 3px; transition: width 0.3s; width: 0%; }
.ls-counter    { font-size: 0.8rem; color: var(--text-secondary); flex-shrink: 0; white-space: nowrap; }

.ls-dots { display: flex; gap: 8px; justify-content: center; }
.ls-dot {
  width: 36px; height: 36px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.95rem; background: var(--surface); border: 1.5px solid var(--border);
  transition: background 0.2s, border-color 0.2s;
}
.ls-dot-active { background: var(--primary);  border-color: var(--primary); }
.ls-dot-done   { background: #10B981; border-color: #10B981; }

.ls-phase      { display: flex; flex-direction: column; gap: 14px; }
.ls-phase.hidden { display: none; }
.ls-phase-label { font-size: 0.8rem; color: var(--text-secondary); text-align: center; }

/* Phase 1 */
.ls-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 16px; padding: 22px 20px;
  display: flex; flex-direction: column; gap: 8px;
}
.ls-word        { font-size: 2rem; font-weight: 800; }
.ls-phonetic    { font-size: 0.9rem; color: var(--text-secondary); }
.ls-type-tag    { font-size: 0.72rem; background: var(--primary); color: #fff; padding: 2px 8px; border-radius: 10px; align-self: flex-start; }
.ls-meaning     { font-size: 1.2rem; font-weight: 600; color: var(--primary); margin-top: 4px; }
.ls-example     { font-size: 0.9rem; font-style: italic; line-height: 1.6; }
.ls-example-vi  { font-size: 0.8rem; color: var(--text-secondary); }
.ls-hl          { font-weight: 700; color: var(--primary); font-style: normal; }
.ls-speak-btn   { background: none; border: 1px solid var(--border); border-radius: 8px; padding: 6px 14px; cursor: pointer; color: var(--text-secondary); font-size: 0.8rem; align-self: flex-start; }

/* Phase 2 */
.ls-recall-prompt { font-size: 1.5rem; font-weight: 700; text-align: center; padding: 8px 0; }
.ls-recall-opts   { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.ls-recall-opt {
  background: var(--surface); border: 1.5px solid var(--border);
  border-radius: 12px; padding: 14px 10px;
  cursor: pointer; font-size: 0.88rem; text-align: center;
  transition: border-color 0.15s, background 0.15s;
}
.ls-recall-opt:hover  { border-color: var(--primary); }
.ls-recall-opt.correct { border-color: #10B981; background: rgba(16,185,129,0.1); color: #10B981; font-weight: 600; }
.ls-recall-opt.wrong   { border-color: #EF4444; background: rgba(239,68,68,0.1);  color: #EF4444; }

/* Phase 3 & 4 */
.ls-type-q { font-size: 1.3rem; font-weight: 600; text-align: center; padding: 8px 0; }
.ls-input {
  width: 100%; padding: 14px 16px; border: 1.5px solid var(--border);
  border-radius: 12px; font-size: 1.1rem; background: var(--surface); color: var(--text);
  box-sizing: border-box; text-align: center; transition: border-color 0.15s;
}
.ls-input:focus   { outline: none; border-color: var(--primary); }
.ls-input.correct { border-color: #10B981; background: rgba(16,185,129,0.08); }
.ls-input.wrong   { border-color: #EF4444; background: rgba(239,68,68,0.08); }

.ls-type-feedback     { font-size: 0.9rem; text-align: center; padding: 6px; }
.ls-type-feedback.ok  { color: #10B981; }
.ls-type-feedback.err { color: #EF4444; }

.ls-fill-hint     { font-size: 0.85rem; color: var(--text-secondary); text-align: center; }
.ls-fill-sentence { font-size: 1rem; line-height: 1.8; font-style: italic; text-align: center; padding: 8px; }
.ls-blank {
  display: inline-block; min-width: 72px;
  border-bottom: 2px solid var(--primary); color: var(--primary);
  font-weight: 700; font-style: normal;
}

/* Done */
.ls-done-icon  { font-size: 3.5rem; text-align: center; }
.ls-done-title { font-size: 1.5rem; font-weight: 700; text-align: center; }
.ls-done-sub   { font-size: 0.9rem; color: var(--text-secondary); text-align: center; }

.ls-cta { margin-top: 8px; }

@media (max-width: 640px) {
  .ls-wrap { padding: 12px 14px calc(74px + env(safe-area-inset-bottom, 0px)); }
}

.setup-card {
  max-width: 640px;
  margin: 0 auto;
  padding: 28px;
}

.setup-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.topic-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.topic-btn {
  padding: 7px 16px;
  border-radius: 999px;
  border: 2px solid var(--border);
  background: var(--card);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: all 0.15s;
}

.topic-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.topic-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.setup-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 8px;
}

.setup-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
}

.radio-group {
  display: flex;
  gap: 16px;
}

.radio-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  cursor: pointer;
  color: var(--text);
}

.setup-grid3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 8px;
}

/* Flashcard session */
.fc-header {
  margin-bottom: 16px;
}

.fc-progress-track {
  height: 6px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 10px;
}

.fc-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 999px;
  transition: width 0.4s ease;
}

.fc-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.fc-counter {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
}

/* The card flip */
.flashcard {
  perspective: 1200px;
  max-width: 560px;
  margin: 0 auto 24px;
  cursor: pointer;
  user-select: none;
}

.flashcard-inner {
  position: relative;
  width: 100%;
  padding-top: 55%;
  transform-style: preserve-3d;
  transition: transform 0.55s cubic-bezier(0.4, 0, 0.2, 1);
}

.flashcard-inner.flipped {
  transform: rotateY(180deg);
}

.flashcard-front,
.flashcard-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 32px;
  box-shadow: var(--shadow-lg);
}

.flashcard-front {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #fff;
}

.flashcard-back {
  background: var(--card);
  border: 1px solid var(--border);
  transform: rotateY(180deg);
  color: var(--text);
}

.fc-type-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 12px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.fc-word {
  font-size: 2.6rem;
  font-weight: 700;
  margin-bottom: 10px;
  text-align: center;
  letter-spacing: -0.5px;
  overflow-wrap: break-word;
  word-break: break-word;
  hyphens: auto;
}

.fc-phonetic {
  font-size: 1rem;
  opacity: 0.85;
  margin-bottom: 12px;
}

.fc-hint {
  font-size: 0.8rem;
  opacity: 0.6;
  margin-top: 8px;
}

/* Nút nghe phát âm trên thẻ */
.fc-speak-btn {
  background: rgba(255, 255, 255, 0.2);
  border: none;
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 1rem;
  cursor: pointer;
  color: #fff;
  transition: background 0.15s, transform 0.1s;
  margin-bottom: 8px;
}

.fc-speak-btn:hover {
  background: rgba(255, 255, 255, 0.35);
  transform: scale(1.08);
}

.fc-speak-back {
  background: rgba(0, 0, 0, 0.07);
  color: var(--text-muted);
  margin-top: 10px;
  margin-bottom: 0;
}

.fc-speak-back:hover {
  background: rgba(0, 0, 0, 0.13);
}

.fc-meaning {
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
  text-align: center;
}

.fc-divider {
  width: 40px;
  height: 2px;
  background: var(--border);
  border-radius: 999px;
  margin: 12px auto;
}

.fc-example {
  font-size: 0.9rem;
  color: var(--text);
  text-align: center;
  font-style: italic;
  margin-bottom: 6px;
}

.fc-example-vi {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: center;
}

.fc-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* Bottom bar (Kết thúc + keyboard hint) */
.fc-bottom-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 16px;
  flex-wrap: wrap;
  gap: 8px;
}

.fc-key-hint {
  font-size: 0.72rem;
  color: var(--text-light);
  font-style: italic;
}

@media (max-width: 640px) {
  .fc-key-hint {
    display: none;
  }
}

/* Done screen — stats + again list */
.fc-done-stats {
  margin: 12px 0;
}

.fc-done-stat-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.fc-done-stat {
  font-size: 0.9rem;
  padding: 4px 12px;
  border-radius: 999px;
  font-weight: 600;
}

.fc-done-stat.ok {
  background: var(--success-light);
  color: #065F46;
}

.fc-done-stat.again {
  background: var(--danger-light);
  color: #991B1B;
}

.fc-done-stat.score {
  background: var(--primary-light);
  color: var(--primary);
  font-size: 1.1rem;
}

.fc-again-section {
  margin: 16px 0;
  text-align: left;
}

.fc-again-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.fc-again-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 200px;
  overflow-y: auto;
}

.fc-again-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 12px;
  background: var(--danger-light);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
}

.fc-ai-word {
  font-weight: 700;
  color: #991B1B;
}

.fc-ai-meaning {
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* ══════════════════════════════════════════ QUIZ ══ */
.quiz-header {
  margin-bottom: 16px;
}

.quiz-progress-track {
  height: 8px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 10px;
}

.quiz-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 999px;
  transition: width 0.35s ease;
}

.quiz-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.quiz-counter {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
}

.quiz-score-badge {
  font-size: 0.875rem;
  font-weight: 700;
  padding: 3px 12px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 999px;
}

.quiz-card {
  max-width: 640px;
  margin: 0 auto;
  padding: 28px;
}

.quiz-prompt {
  font-size: 1.3rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: 28px;
  color: var(--text);
  line-height: 1.4;
  overflow-wrap: break-word;
  word-break: break-word;
}

.quiz-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.quiz-opt {
  padding: 14px 18px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
  cursor: pointer;
  transition: all 0.15s;
  text-align: left;
}

.quiz-opt:hover:not(:disabled) {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary);
}

.quiz-opt.correct {
  border-color: var(--success);
  background: var(--success-light);
  color: #065F46;
}

.quiz-opt.wrong {
  border-color: var(--danger);
  background: var(--danger-light);
  color: #991B1B;
}

.quiz-opt:disabled {
  cursor: default;
}

/* ══════════════════════════════════════════ RESULTS ══ */
.result-wrap {
  display: flex;
  justify-content: center;
}

.result-card {
  max-width: 480px;
  width: 100%;
  padding: 40px 36px;
  text-align: center;
}

.result-emoji {
  font-size: 3.5rem;
  margin-bottom: 16px;
}

.result-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.result-sub {
  color: var(--text-muted);
  margin-bottom: 20px;
}

.result-score-big {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  margin: 16px 0;
}

.result-bar-track {
  height: 12px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 24px;
}

.result-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 999px;
  transition: width 0.8s ease;
}

.result-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

.wrong-section {
  margin: 16px 0;
  text-align: left;
}

.wrong-title {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 8px;
  text-align: center;
}

.wrong-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: var(--danger-light);
  border-radius: var(--radius-sm);
  margin-bottom: 6px;
  font-size: 0.825rem;
}

.wrong-word {
  font-weight: 700;
  color: #991B1B;
}

.wrong-meaning {
  color: var(--text-muted);
}

/* ══════════════════════════════════════════ PROGRESS ══ */
.activity-chart {
  padding: 8px 0;
}

.chart-bars {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  height: 120px;
}

.chart-bar-wrap {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  height: 100%;
  justify-content: flex-end;
}

.chart-bar {
  width: 100%;
  min-height: 4px;
  background: linear-gradient(180deg, var(--primary), var(--primary-mid));
  border-radius: 4px 4px 0 0;
  transition: height 0.6s ease;
}

.chart-bar.today {
  background: linear-gradient(180deg, var(--secondary), var(--primary));
}

.chart-bar.empty {
  background: var(--border);
}

.chart-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 500;
}

.chart-val {
  font-size: 0.72rem;
  color: var(--text-light);
}

.progress-bottom {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 16px;
}

/* Topic progress */
.topic-row {
  margin-bottom: 14px;
}

.topic-row:last-child {
  margin-bottom: 0;
}

.topic-row-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.topic-name {
  font-size: 0.875rem;
  font-weight: 600;
}

.topic-pct {
  font-size: 0.825rem;
  color: var(--text-muted);
  font-weight: 600;
}

.topic-track {
  height: 8px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
}

.topic-fill {
  height: 100%;
  border-radius: 999px;
  transition: width 0.7s ease;
}

/* Badges */
.badges-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.badge-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 16px 10px;
  border-radius: var(--radius);
  border: 2px solid var(--border);
  text-align: center;
  transition: all 0.15s;
}

.badge-item.earned {
  border-color: var(--warning);
  background: var(--warning-light);
}

.badge-item.locked {
  opacity: 0.4;
  filter: grayscale(1);
}

.badge-icon {
  font-size: 1.8rem;
}

.badge-name {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text);
}

.badge-desc {
  font-size: 0.65rem;
  color: var(--text-muted);
}

/* ══════════════════════════════════════════ DARK MODE ══ */
[data-theme="dark"] {
  --bg: #0F172A;
  --card: #1E293B;
  --border: #334155;
  --border-light: #293548;

  --text: #F1F5F9;
  --text-muted: #94A3B8;
  --text-light: #64748B;

  --primary-light: #1E1B4B;
  --success-light: #064E3B;
  --warning-light: #451A03;
  --danger-light: #450A0A;
  --info-light: #0C1A3A;

  --shadow-xs: 0 1px 2px rgba(0, 0, 0, .4);
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, .5);
  --shadow: 0 4px 12px rgba(0, 0, 0, .4);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, .5);
}

[data-theme="dark"] .wc-level-tag.beginner {
  background: #064E3B;
  color: #6EE7B7;
}

[data-theme="dark"] .wc-level-tag.intermediate {
  background: #451A03;
  color: #FCD34D;
}

[data-theme="dark"] .wc-level-tag.advanced {
  background: #450A0A;
  color: #FCA5A5;
}

[data-theme="dark"] .wc-learn-btn {
  background: var(--card);
  border-color: var(--border);
}

[data-theme="dark"] .wc-learn-btn:hover {
  background: #064E3B;
  border-color: var(--success);
  color: #6EE7B7;
}

[data-theme="dark"] .word-card.expanded {
  background: #1E1B4B;
  border-color: var(--primary);
}

[data-theme="dark"] .quiz-opt.correct {
  color: #6EE7B7;
}

[data-theme="dark"] .quiz-opt.wrong {
  color: #FCA5A5;
}

[data-theme="dark"] .wrong-item {
  background: #450A0A;
}

[data-theme="dark"] .wrong-word {
  color: #FCA5A5;
}

[data-theme="dark"] .wrong-meaning {
  color: var(--text-muted);
}

[data-theme="dark"] .streak-badge {
  background: linear-gradient(135deg, #451A03, #78350F);
  border-color: #92400E;
  color: #FCD34D;
}

[data-theme="dark"] .badge-item.earned {
  background: #451A03;
}

[data-theme="dark"] .flashcard-back {
  background: #253348;
  border-color: #334155;
}

/* Rating buttons (FSRS) */
.rating-btns {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.rating-btn {
  flex: 1;
  max-width: 130px;
  min-width: 80px;
  padding: 10px 8px;
  border-radius: var(--radius);
  border: 2px solid transparent;
  font-size: 0.8rem;
  font-weight: 700;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  transition: all 0.15s;
  cursor: pointer;
}

.rating-btn:active {
  transform: translateY(1px);
}

.rb-label {
  font-size: 0.85rem;
}

.rb-interval {
  font-size: 0.7rem;
  opacity: 0.75;
  font-weight: 500;
}

.rating-btn.again {
  background: #FEE2E2;
  border-color: #EF4444;
  color: #991B1B;
}

.rating-btn.hard {
  background: #FEF3C7;
  border-color: #F59E0B;
  color: #92400E;
}

.rating-btn.good {
  background: #DBEAFE;
  border-color: #3B82F6;
  color: #1E40AF;
}

.rating-btn.easy {
  background: #D1FAE5;
  border-color: #10B981;
  color: #065F46;
}

.rating-btn.again:hover {
  background: #EF4444;
  color: #fff;
}

.rating-btn.hard:hover {
  background: #F59E0B;
  color: #fff;
}

.rating-btn.good:hover {
  background: #3B82F6;
  color: #fff;
}

.rating-btn.easy:hover {
  background: #10B981;
  color: #fff;
}

/* Nút Ổn được highlight là lựa chọn mặc định khi ôn lại */
.rating-btn.rating-default {
  background: #3B82F6;
  border-color: #2563EB;
  color: #fff;
  flex: 1.5;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
}

.rating-btn.rating-default:hover {
  background: #2563EB;
}

/* Nút Dễ thu nhỏ, ít nổi bật */
.rating-btn.rating-subtle {
  flex: 0.7;
  opacity: 0.6;
  font-size: 0.75rem;
}

.rating-btn.rating-subtle:hover {
  opacity: 1;
}

[data-theme="dark"] .rating-btn.again {
  background: #450A0A;
  border-color: #EF4444;
  color: #FCA5A5;
}

[data-theme="dark"] .rating-btn.hard {
  background: #451A03;
  border-color: #F59E0B;
  color: #FCD34D;
}

[data-theme="dark"] .rating-btn.good {
  background: #1E3A5F;
  border-color: #3B82F6;
  color: #93C5FD;
}

[data-theme="dark"] .rating-btn.easy {
  background: #064E3B;
  border-color: #10B981;
  color: #6EE7B7;
}

[data-theme="dark"] .rating-btn.rating-default {
  background: #2563EB;
  border-color: #1D4ED8;
  color: #fff;
}

/* Theme toggle button */
.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--border-light);
  border: 1px solid var(--border);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.2s;
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
  pointer-events: none;
}

.theme-toggle:hover {
  background: var(--primary-light);
  color: var(--primary);
  border-color: var(--primary);
}

.nav-end {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 10px;
}

/* ══════════════════════════════════════════ PRACTICE ══ */

/* Stat card: clickable + red variant */
.stat-card.clickable {
  cursor: pointer;
}

.stat-card.clickable:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.stat-icon.red {
  background: var(--danger-light);
}

/* Mode selection grid */
.mode-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 12px;
  margin-bottom: 20px;
}

.mode-card {
  background: var(--card);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px 14px;
  cursor: pointer;
  transition: all 0.18s;
  display: flex;
  flex-direction: column;
  gap: 10px;
  position: relative;
  box-shadow: var(--shadow-xs);
}

.mode-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.mode-card.selected {
  border-color: var(--primary);
  background: var(--primary-light);
  box-shadow: var(--shadow);
}

.mode-icon-bg {
  width: 44px;
  height: 44px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}

.mode-info {
  flex: 1;
}

.mode-name {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 2px;
}

.mode-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.mode-tag {
  display: inline-flex;
  align-items: center;
  font-size: 0.68rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 999px;
  width: fit-content;
}

.srs-tag {
  background: #EDE9FE;
  color: #5B21B6;
}

.recall-tag {
  background: #D1FAE5;
  color: #065F46;
}

.speed-tag {
  background: #FEE2E2;
  color: #991B1B;
}

.weak-tag {
  background: #FEF3C7;
  color: #92400E;
}

/* Practice setup: count buttons */
.count-row {
  margin-bottom: 16px;
}

.count-btns {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.count-btn {
  padding: 7px 18px;
  border-radius: 999px;
  border: 2px solid var(--border);
  background: var(--card);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-muted);
  transition: all 0.15s;
}

.count-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.count-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* Practice setup: qtype pills */
.qtype-pills {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.qtype-pill {
  padding: 6px 14px;
  border-radius: 999px;
  border: 2px solid var(--border);
  background: var(--card);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: all 0.15s;
}

.qtype-pill:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.qtype-pill.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* Speed timer */
.speed-timer {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 14px;
  border-radius: 999px;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.9rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  transition: all 0.3s;
}

.speed-timer.urgent {
  background: var(--danger-light);
  color: var(--danger);
  animation: pulse-timer 0.8s ease-in-out infinite;
}

@keyframes pulse-timer {

  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.08);
  }
}

/* Listen button */
.listen-btn-wrap {
  display: flex;
  justify-content: center;
  margin-bottom: 8px;
}

.listen-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: 999px;
  border: 2px solid var(--warning);
  background: var(--warning-light);
  color: #92400E;
  font-size: 0.9rem;
  font-weight: 700;
  transition: all 0.15s;
}

.listen-btn:hover {
  background: var(--warning);
  color: #fff;
}

/* ── Typing mode ── */
.typing-card {
  max-width: 640px;
  margin: 0 auto;
  padding: 20px 22px;
}

.typing-meaning-box {
  background: rgba(79, 70, 229, 0.06);
  border-radius: 12px;
  padding: 16px 18px 14px;
  margin-bottom: 16px;
  text-align: center;
}

.typing-label {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.3px;
  margin-bottom: 6px;
}

.typing-prompt {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--primary);
  text-align: center;
  margin-bottom: 10px;
  line-height: 1.35;
}

.typing-input-wrap {
  display: flex;
  gap: 10px;
}

.typing-input {
  flex: 1;
  padding: 12px 16px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  color: var(--text);
  background: var(--bg);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.typing-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, .12);
  background: var(--card);
}

.typing-feedback {
  margin-top: 14px;
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 600;
  text-align: center;
}

.typing-feedback.fb-correct {
  background: var(--success-light);
  color: #065F46;
  border: 1px solid var(--success);
}

.typing-feedback.fb-typo {
  background: #FEF3C7;
  color: #92400E;
  border-radius: 8px;
  padding: 12px 16px;
  font-size: 0.9rem;
  margin-top: 14px;
}

.typing-feedback.fb-wrong {
  background: var(--danger-light);
  color: #991B1B;
  border: 1px solid var(--danger);
}
.fb-requeue {
  margin-top: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  color: #D97706;
  opacity: 0.9;
}

/* ══════════════════════════════════════════ PRACTICE OVERLAYS ══ */

/* Practice session overlays — position: fixed over any active tab */
#practiceSetupCard:not(.hidden),
#practiceQuestion:not(.hidden),
#practiceResult:not(.hidden),
#typingSession:not(.hidden),
#typingResult:not(.hidden) {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: var(--bg);
  overflow-y: auto;
  padding: 28px max(24px, calc((100vw - 680px) / 2)) 32px;
  max-width: none;
  margin: 0;
  border-radius: 0;
}

/* Result screens: center vertically on desktop */
#practiceResult:not(.hidden),
#typingResult:not(.hidden) {
  display: flex;
  align-items: center;
  justify-content: center;
}

@media (max-width: 640px) {

  #practiceSetupCard:not(.hidden),
  #practiceQuestion:not(.hidden),
  #practiceResult:not(.hidden),
  #typingSession:not(.hidden),
  #typingResult:not(.hidden) {
    padding: 16px 12px calc(74px + env(safe-area-inset-bottom, 0px));
    display: block;
  }
}

.overlay-close-btn {
  position: sticky;
  top: 0;
  float: right;
  background: transparent;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  color: var(--text-secondary);
  padding: 10px 12px;
  min-width: 44px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  line-height: 1;
}

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

/* ══════════════════════════════════════════ REVIEW TAB ══ */

/* CTA chính */
.rv-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: linear-gradient(135deg, var(--primary), #7C3AED);
  color: #fff;
  border-radius: 14px;
  padding: 12px 16px;
  cursor: pointer;
  margin-bottom: 10px;
  transition: filter 0.15s;
}
.rv-cta:hover { filter: brightness(1.07); }
.rv-cta.done { background: linear-gradient(135deg, #059669, #10B981); }
.rv-cta-left  { display: flex; align-items: center; gap: 10px; min-width: 0; }
.rv-cta-icon  { font-size: 1.3rem; flex-shrink: 0; }
.rv-cta-title { font-size: 0.92rem; font-weight: 700; }
.rv-cta-sub   { font-size: 0.7rem; opacity: 0.85; margin-top: 1px; }
.rv-cta-btn {
  flex-shrink: 0;
  background: rgba(255,255,255,0.22);
  border: 1px solid rgba(255,255,255,0.4);
  color: #fff;
  border-radius: 8px;
  padding: 6px 13px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s;
}
.rv-cta-btn:hover { background: rgba(255,255,255,0.35); }

/* Từ yếu + Từ khó */
.rv-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 10px;
}
.rv-card {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
  cursor: pointer;
  transition: all 0.15s;
}
.rv-card:hover        { transform: translateY(-1px); box-shadow: 0 4px 12px var(--shadow); }
.rv-weak:hover        { border-color: #F59E0B; }
.rv-hard:hover        { border-color: #EF4444; }
.rv-card-icon         { font-size: 1.2rem; flex-shrink: 0; }
.rv-card-text         { font-size: 0.83rem; font-weight: 600; color: var(--text); }
.rv-card.rv-disabled  { opacity: 0.4; cursor: default; pointer-events: none; }

/* Luyện thêm */
.rv-extra { margin-bottom: 10px; }
.rv-section-label {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  margin-bottom: 8px;
}
.rv-modes {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}
.rv-mode-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 4px;
  font-size: 0.78rem;
  cursor: pointer;
  color: var(--text);
  line-height: 1.5;
  text-align: center;
  transition: all 0.15s;
}
.rv-mode-btn:hover {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary);
}

/* Lịch ôn collapsible */
.rv-schedule {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}
.rv-schedule-hd {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  cursor: pointer;
  font-size: 0.875rem;
  color: var(--text-secondary);
  user-select: none;
  transition: background 0.15s;
}
.rv-schedule-hd:hover { background: var(--hover); }
.rv-sched-arrow {
  font-size: 0.72rem;
  transition: transform 0.2s;
}
.rv-sched-arrow.open  { transform: rotate(180deg); }
.rv-schedule-body:not(.hidden) { padding: 0 12px 12px; }

/* Review schedule */
.schedule-row {
  display: flex;
  gap: 8px;
  justify-content: space-between;
}

.schedule-day {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 10px 6px;
  border-radius: var(--radius);
  background: var(--bg);
  text-align: center;
}

.schedule-day.today {
  background: var(--primary-light);
}

.sched-label {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.sched-count {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text);
}

.sched-count.has-words {
  color: var(--primary);
}

.sched-sub {
  font-size: 0.65rem;
  color: var(--text-light);
}

/* ══════════════════════════════════════════ DARK MODE (new) ══ */
[data-theme="dark"] .btn-outline {
  background: rgba(99, 102, 241, 0.15);
}

[data-theme="dark"] .btn-outline:hover {
  background: rgba(99, 102, 241, 0.28);
}

[data-theme="dark"] .btn-ghost {
  background: var(--card);
  border-color: var(--border);
}

[data-theme="dark"] .btn-ghost:hover {
  background: var(--surface);
  border-color: var(--text-muted);
}

[data-theme="dark"] .hero-cta-btn {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  box-shadow: none;
}

[data-theme="dark"] .hero-cta-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

[data-theme="dark"] .fc-done-stat.ok {
  background: #064E3B;
  color: #6EE7B7;
}

[data-theme="dark"] .fc-done-stat.again {
  background: #450A0A;
  color: #FCA5A5;
}

[data-theme="dark"] .fc-done-stat.score {
  background: #1E1B4B;
  color: #C4B5FD;
}

[data-theme="dark"] .fc-again-item {
  background: #450A0A;
}

[data-theme="dark"] .fc-ai-word {
  color: #FCA5A5;
}

[data-theme="dark"] .fc-speak-back {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
}

[data-theme="dark"] .fc-speak-back:hover {
  background: rgba(255, 255, 255, 0.15);
}

[data-theme="dark"] .mode-card {
  background: var(--card);
  border-color: var(--border);
}

[data-theme="dark"] .mode-card.selected {
  background: #1E1B4B;
  border-color: var(--primary);
}

[data-theme="dark"] .srs-tag {
  background: #2E1065;
  color: #C4B5FD;
}

[data-theme="dark"] .recall-tag {
  background: #064E3B;
  color: #6EE7B7;
}

[data-theme="dark"] .speed-tag {
  background: #450A0A;
  color: #FCA5A5;
}

[data-theme="dark"] .weak-tag {
  background: #451A03;
  color: #FCD34D;
}

[data-theme="dark"] .count-btn {
  background: var(--card);
  border-color: var(--border);
  color: var(--text-muted);
}

[data-theme="dark"] .count-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

[data-theme="dark"] .qtype-pill {
  background: var(--card);
  border-color: var(--border);
  color: var(--text-muted);
}

[data-theme="dark"] .qtype-pill.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

[data-theme="dark"] .typing-input {
  background: var(--card);
  border-color: var(--border);
  color: var(--text);
}

[data-theme="dark"] .typing-input:focus {
  background: #253348;
}

[data-theme="dark"] .typing-feedback.fb-correct {
  background: #064E3B;
  color: #6EE7B7;
}

[data-theme="dark"] .typing-feedback.fb-wrong {
  background: #450A0A;
  color: #FCA5A5;
}

[data-theme="dark"] .typing-feedback.fb-typo {
  background: #451A03;
  color: #FDE68A;
}

[data-theme="dark"] .fb-requeue { color: #FCD34D; }

/* Typing extras */
.typing-context-row {
  display: flex; align-items: center; justify-content: center; gap: 6px;
}
.typing-phonetic-hint {
  font-size: 0.82rem; color: var(--text-secondary); font-style: italic;
}
.typing-speak-btn {
  background: none; border: none; cursor: pointer;
  font-size: 0.95rem; color: var(--text-secondary); padding: 2px 4px; flex-shrink: 0; line-height: 1;
}
.typing-speak-btn:hover { color: var(--primary); }

.typing-input.input-correct { border-color: #10B981; background: rgba(16,185,129,0.08); }
.typing-input.input-wrong   { border-color: #EF4444; background: rgba(239,68,68,0.08); }

.typing-hint-row {
  display: flex; align-items: center; gap: 10px; margin-top: 10px;
}
.typing-hint-btn {
  background: none; border: 1px dashed var(--border); border-radius: 8px;
  padding: 5px 12px; font-size: 0.78rem; cursor: pointer; color: var(--text-secondary);
  transition: border-color 0.15s, color 0.15s; flex-shrink: 0;
}
.typing-hint-btn:hover:not(:disabled) { border-color: #F59E0B; color: #F59E0B; }
.typing-hint-btn:disabled { opacity: 0.4; cursor: default; }
.typing-hint-text {
  font-family: monospace; font-size: 1.05rem; letter-spacing: 4px;
  color: var(--primary); font-weight: 600;
}

.fb-phonetic { font-size: 0.8rem; margin-left: 8px; opacity: 0.8; }
.fb-example  { font-size: 0.82rem; font-style: italic; margin-top: 6px; opacity: 0.9; }

/* Quick start strip */
.typing-qs { margin-bottom: 4px; }
.typing-qs-strip {
  display: flex; align-items: center; gap: 12px;
  background: linear-gradient(135deg, var(--primary), #7C3AED);
  color: #fff; border-radius: 12px; padding: 12px 14px;
  cursor: pointer; transition: filter 0.15s;
}
.typing-qs-strip:hover { filter: brightness(1.07); }
.typing-qs-icon  { font-size: 1.3rem; flex-shrink: 0; }
.typing-qs-info  { flex: 1; min-width: 0; }
.typing-qs-label { font-size: 0.85rem; font-weight: 700; }
.typing-qs-sub   { font-size: 0.72rem; opacity: 0.85; margin-top: 1px; }
.typing-qs-btn {
  flex-shrink: 0; background: rgba(255,255,255,0.22);
  border: 1px solid rgba(255,255,255,0.4); color: #fff;
  border-radius: 8px; padding: 6px 12px; font-size: 0.8rem;
  font-weight: 600; cursor: pointer; white-space: nowrap;
}
.typing-qs-divider {
  text-align: center; font-size: 0.72rem; color: var(--text-muted);
  margin: 8px 0 4px;
}

[data-theme="dark"] .listen-btn {
  background: #451A03;
  border-color: var(--warning);
  color: #FCD34D;
}

[data-theme="dark"] .listen-btn:hover {
  background: var(--warning);
  color: #fff;
}


[data-theme="dark"] .speed-timer {
  background: #1E1B4B;
  color: #A5B4FC;
}

[data-theme="dark"] .speed-timer.urgent {
  background: #450A0A;
  color: #FCA5A5;
}

/* ══════════════════════════════════════════ SETTINGS ══ */
.settings-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}

.settings-section.full-width {
  grid-column: 1 / -1;
}

.settings-section-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 10px;
}

.settings-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
  overflow: hidden;
}

.st-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  flex-wrap: wrap;
}

.st-row-info {
  flex: 1;
  min-width: 160px;
}

.st-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 2px;
}

.st-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.st-control {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  flex-shrink: 0;
}

.st-divider {
  height: 1px;
  background: var(--border-light);
  margin: 0 20px;
}

/* Theme / goal / count / rate buttons */
.st-theme-btn,
.st-goal-btn,
.st-count-btn,
.st-rate-btn {
  padding: 6px 14px;
  border-radius: 999px;
  border: 2px solid var(--border);
  background: var(--card);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: all 0.15s;
  white-space: nowrap;
}

.st-theme-btn:hover,
.st-goal-btn:hover,
.st-count-btn:hover,
.st-rate-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.st-theme-btn.active,
.st-goal-btn.active,
.st-count-btn.active,
.st-rate-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* Toggle switch */
.st-toggle {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 26px;
  cursor: pointer;
}

.st-toggle input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.st-toggle-track {
  position: absolute;
  inset: 0;
  background: var(--border);
  border-radius: 999px;
  transition: background 0.2s;
}

.st-toggle input:checked~.st-toggle-track {
  background: var(--primary);
}

.st-toggle-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 20px;
  height: 20px;
  background: #fff;
  border-radius: 50%;
  transition: transform 0.2s;
  box-shadow: var(--shadow-xs);
}

.st-toggle input:checked~.st-toggle-track .st-toggle-thumb {
  transform: translateX(22px);
}

/* Data stats */
.st-data-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border-light);
}

.st-data-stat {
  padding: 16px;
  background: var(--card);
  text-align: center;
}

.st-data-val {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 3px;
}

.st-data-lbl {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Action buttons row */
.st-action-row {
  display: flex;
  gap: 10px;
  padding: 16px 20px;
  flex-wrap: wrap;
}

.st-btn-danger-outline {
  background: transparent;
  color: var(--danger);
  border: 2px solid var(--danger);
}

.st-btn-danger-outline:hover {
  background: var(--danger-light);
}

.st-btn-danger {
  background: var(--danger);
  color: #fff;
  border: 2px solid var(--danger);
}

.st-btn-danger:hover {
  background: #DC2626;
  border-color: #DC2626;
}

/* About card */
.st-about {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 32px 24px;
  text-align: center;
  gap: 8px;
}

.st-about-icon {
  font-size: 2.5rem;
}

.st-about-name {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text);
}

.st-about-ver {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.st-about-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  max-width: 420px;
  line-height: 1.6;
}

.st-about-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 8px;
}

.st-about-tags span {
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 600;
}

/* Dark mode */
[data-theme="dark"] .settings-card {
  background: var(--card);
}

[data-theme="dark"] .st-theme-btn,
[data-theme="dark"] .st-goal-btn,
[data-theme="dark"] .st-count-btn,
[data-theme="dark"] .st-rate-btn {
  background: var(--card);
  border-color: var(--border);
  color: var(--text-muted);
}

[data-theme="dark"] .st-data-stat {
  background: var(--card);
}

[data-theme="dark"] .st-btn-danger-outline {
  background: transparent;
}

[data-theme="dark"] .st-btn-danger-outline:hover {
  background: #450A0A;
}

/* ══════════════════════════════════════════ RESPONSIVE ══ */

/* ── Medium tablet 641–900px: icon-only nav to prevent overflow ── */
@media (min-width: 641px) and (max-width: 900px) {
  .nav-tab span {
    display: none;
  }

  .nav-tab {
    padding: 8px 14px;
    gap: 0;
  }

  .nav-tab svg {
    width: 20px;
    height: 20px;
  }
}


/* ── Tablet nhỏ: ≤900px ── */
@media (max-width: 900px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .dashboard-grid {
    grid-template-columns: 1fr;
  }

  .progress-bottom {
    grid-template-columns: 1fr;
  }

  .mode-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .settings-layout {
    grid-template-columns: 1fr;
  }

  .st-data-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .st-row {
    flex-wrap: wrap;
    gap: 12px;
  }

  .st-control {
    flex-wrap: wrap;
  }
}

/* ── Mobile lớn: ≤640px ── */
@media (max-width: 640px) {

  /* Layout — thêm padding-bottom để tránh bị che bởi bottom nav */
  .main {
    padding: 16px 12px calc(74px + env(safe-area-inset-bottom, 0px));
  }

  .page-title {
    font-size: 1.35rem;
  }

  .page-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .page-header .btn {
    width: 100%;
    justify-content: center;
  }

  /* Navbar → bottom navigation bar */
  .navbar {
    position: fixed;
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    height: calc(58px + env(safe-area-inset-bottom, 0px));
    padding: 0 4px env(safe-area-inset-bottom, 0px);
    gap: 0;
    border-bottom: none;
    border-top: 1px solid var(--border);
  }

  .brand {
    display: none;
  }

  .nav-end {
    display: none;
  }

  .nav-tabs {
    justify-content: space-around;
    overflow: visible;
  }

  .nav-tab {
    flex: 1;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    padding: 5px 2px;
    font-size: 0.62rem;
    border-radius: var(--radius-sm);
    min-height: 48px;
  }

  .nav-tab svg {
    width: 20px;
    height: 20px;
  }

  .nav-tab span {
    display: block;
    font-size: 0.62rem;
  }

  /* Dashboard */
  .hero-cta {
    flex-direction: column;
    align-items: flex-start;
    padding: 18px 16px;
    gap: 12px;
  }

  .hero-cta-icon {
    font-size: 2.2rem;
  }

  .hero-cta-title {
    font-size: 1.05rem;
  }

  .hero-cta-btn {
    width: 100%;
    text-align: center;
    padding: 14px;
    font-size: 1rem;
  }

  .dashboard-grid {
    grid-template-columns: 1fr;
  }

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

  .stat-value {
    font-size: 1.5rem;
  }

  /* Flashcard */
  .fc-word {
    font-size: 1.9rem;
  }

  .fc-meaning {
    font-size: 1.4rem;
  }

  .setup-grid3 {
    grid-template-columns: 1fr;
  }

  .setup-row {
    grid-template-columns: 1fr;
  }

  .rating-btns {
    gap: 6px;
  }

  .rating-btn {
    padding: 8px 6px;
    font-size: 0.75rem;
  }

  /* MCQ */
  .quiz-card {
    padding: 18px 14px;
  }

  .quiz-options {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .quiz-prompt {
    font-size: 1.1rem;
    margin-bottom: 18px;
  }

  /* Result */
  .result-card {
    padding: 28px 20px;
  }

  .result-score-big {
    font-size: 2.6rem;
  }

  .result-actions {
    flex-direction: column;
  }

  .result-actions .btn {
    width: 100%;
    justify-content: center;
  }

  /* Practice mode grid */
  .mode-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }

  .mode-card {
    padding: 12px 10px;
  }

  .mode-icon-bg {
    width: 36px;
    height: 36px;
    font-size: 1.1rem;
  }

  .mode-name {
    font-size: 0.8rem;
  }

  .mode-desc {
    font-size: 0.7rem;
  }

  /* Setup card */
  .setup-card {
    padding: 24px 16px;
  }

  .setup-card .btn-lg {
    width: 100%;
    justify-content: center;
    margin-top: 24px;
  }

  .topic-selector {
    gap: 8px 6px;
  }

  .count-btns {
    gap: 8px;
  }

  .count-btn {
    padding: 6px 14px;
  }

  .qtype-pills {
    gap: 6px;
  }

  .qtype-pill {
    padding: 5px 10px;
    font-size: 0.75rem;
  }

  /* Typing */
  .typing-card {
    padding: 18px 12px;
  }

  .typing-prompt {
    font-size: 1.2rem;
  }

  .typing-input-wrap {
    flex-direction: column;
  }

  .typing-input-wrap .btn {
    width: 100%;
  }

  /* Review */
  .rv-modes {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .rv-pair {
    gap: 8px;
  }

  .rv-card {
    padding: 12px 8px;
    flex-direction: column;
    justify-content: center;
    text-align: center;
    gap: 6px;
  }

  .rv-card-icon {
    font-size: 1.4rem;
  }

  .rv-cta {
    padding: 16px 14px;
  }

  .schedule-row {
    gap: 5px;
  }

  .schedule-day {
    padding: 8px 3px;
  }

  .sched-count {
    font-size: 0.95rem;
  }

  /* Progress */
  .badges-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Topics & Words */
  .topic-cards-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .word-grid {
    grid-template-columns: 1fr;
  }

  .tw-header {
    display: grid;
    grid-template-columns: auto 1fr auto;
    grid-template-rows: auto auto;
    align-items: center;
    gap: 8px 12px;
    flex-wrap: unset;
  }

  .tw-back-btn {
    grid-column: 1;
    grid-row: 1;
  }

  .tw-study-btn {
    grid-column: 3;
    grid-row: 1;
  }

  .tw-title-wrap {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  /* Settings */
  .st-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .st-control {
    flex-wrap: wrap;
    gap: 6px;
  }

  .st-data-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .st-action-row {
    flex-direction: column;
    padding: 14px;
    gap: 8px;
  }

  .st-action-row .btn {
    width: 100%;
    justify-content: center;
  }

  .st-about {
    padding: 24px 16px;
  }


  /* Touch targets */
  .btn {
    min-height: 44px;
  }

  .wc-learn-btn {
    width: 36px;
    height: 36px;
    font-size: 1.1rem;
  }

  .tc-btn-study,
  .tc-btn-view {
    min-height: 44px;
  }

  .topic-btn {
    min-height: 38px;
    padding: 6px 12px;
    font-size: 0.8rem;
  }

  .count-btn {
    min-height: 40px;
  }

  .qtype-pill {
    min-height: 40px;
  }
}

/* ── Mobile nhỏ: ≤480px ── */
@media (max-width: 480px) {

  /* Bottom nav — giảm font label cho vừa 5 tab */
  .nav-tab span {
    font-size: 0.58rem;
  }

  .nav-tab svg {
    width: 19px;
    height: 19px;
  }

  /* Mode grid 1 cột */
  .mode-grid {
    grid-template-columns: 1fr;
  }

  .mode-card {
    flex-direction: row;
    align-items: center;
    gap: 12px;
  }

  .mode-info {
    flex: 1;
  }

  /* Stats 2 cột */
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stat-icon {
    width: 38px;
    height: 38px;
    font-size: 1.1rem;
  }

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

  /* Quiz full-width options */
  .quiz-options {
    grid-template-columns: 1fr;
  }

  /* Settings buttons wrap */
  .st-theme-btn,
  .st-goal-btn,
  .st-count-btn,
  .st-rate-btn {
    padding: 5px 10px;
    font-size: 0.75rem;
  }

  /* Flashcard — smaller word, tighter card padding */
  .fc-word {
    font-size: 1.75rem;
  }

  .flashcard-front,
  .flashcard-back {
    padding: 20px 14px;
  }

  .fc-meaning {
    font-size: 1.4rem;
  }

  /* Rating buttons — allow smaller min-width to avoid wrapping at 375px */
  .rating-btn {
    min-width: 60px;
  }

  /* Schedule row — tighter at small screens */
  .schedule-row {
    gap: 3px;
  }

  .sched-label {
    font-size: 0.58rem;
  }

  .sched-count {
    font-size: 0.9rem;
  }

  /* Activity chart bars */
  .chart-bars {
    gap: 5px;
  }

}

/* ── Very small phones: ≤375px ── */
@media (max-width: 375px) {

  /* Tighter main padding */
  .main {
    padding-left: 10px;
    padding-right: 10px;
  }

  /* Typography scale-down */
  .page-title {
    font-size: 1.2rem;
  }

  .fc-word {
    font-size: 1.5rem;
  }

  .fc-meaning {
    font-size: 1.25rem;
  }


  /* Schedule — very compact */
  .sched-label {
    font-size: 0.52rem;
  }

  .sched-count {
    font-size: 0.8rem;
  }

  .sched-sub {
    display: none;
  }

  .schedule-day {
    padding: 6px 2px;
    gap: 2px;
  }


  /* Stat cards tighter */
  .stat-card {
    padding: 14px;
    gap: 10px;
  }

  .stat-value {
    font-size: 1.3rem;
  }
}