/* Anki Review UI Styles */
:root {
  --anki-bg: var(--bg, var(--bg-main, #f5f7fb));
  --anki-surface: var(--card-bg, var(--bg-card, #ffffff));
  --anki-surface-soft: var(--panel-bg, #f8fafc);
  --anki-surface-strong: var(--track-bg, #f3f4f6);
  --anki-text: var(--text-main, #111827);
  --anki-muted: var(--text-sub, var(--text-muted, #6b7280));
  --anki-border: var(--border, var(--border-color, #e5e7eb));
  --anki-primary: var(--primary, #2563eb);
  --anki-primary-weak: var(--primary-soft, #dbeafe);
  --anki-success: var(--success, #16a34a);
  --anki-warn: var(--warning, #f59e0b);
  --anki-danger: var(--danger, #ef4444);
  --anki-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 24px 18px 120px;
  background: var(--bg-grad, radial-gradient(1200px 600px at 30% -20%, #eef4ff 0%, var(--anki-bg) 55%));
  color: var(--anki-text);
}

h1 {
  margin: 0 0 8px;
  font-size: 1.5rem;
}

.subtitle {
  margin: 0 0 16px;
  color: var(--anki-muted);
}

.top-actions {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
}

.ghost-btn,
.btn,
.start-btn,
.grade-btn {
  border: 1px solid var(--anki-border);
  background: var(--anki-surface);
  color: var(--anki-text);
  border-radius: 10px;
  padding: 9px 12px;
  cursor: pointer;
  transition: background-color .15s ease, border-color .15s ease, transform .15s ease;
}

.ghost-btn:hover,
.btn:hover,
.start-btn:hover,
.grade-btn:hover {
  filter: brightness(1.06);
}

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

.start-btn {
  font-weight: 700;
}

.card {
  background: var(--anki-surface);
  border: 1px solid var(--anki-border);
  border-radius: 14px;
  padding: 14px;
  box-shadow: var(--anki-shadow);
}

.row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.badge {
  border: 1px solid var(--anki-border);
  border-radius: 999px;
  padding: 3px 10px;
  font-size: 12px;
  background: var(--anki-surface);
}

.status {
  font-size: 13px;
  color: var(--anki-muted);
}

.status.ok {
  color: var(--anki-success);
}

.status.bad {
  color: var(--anki-danger);
}

.muted,
.tiny {
  color: var(--anki-muted);
}

.tiny {
  font-size: 12px;
}

.tabs {
  display: flex;
  gap: 8px;
  margin: 14px 0;
}

.tab {
  border: 1px solid var(--anki-border);
  background: var(--anki-surface);
  border-radius: 10px;
  padding: 8px 12px;
  cursor: pointer;
}

.tab.active {
  border-color: var(--anki-primary);
  background: var(--anki-primary-weak);
  color: var(--anki-text);
}

.anki-home-top,
.anki-home-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.anki-home-title {
  font-weight: 700;
}

.anki-home-panel {
  margin: 10px 0;
  border: 1px solid var(--anki-border);
  border-radius: 12px;
  overflow: hidden;
  background: var(--anki-surface);
}

.anki-table {
  width: 100%;
  border-collapse: collapse;
}

.anki-table th,
.anki-table td {
  border-bottom: 1px solid var(--anki-border);
  padding: 10px;
  text-align: left;
  font-size: 14px;
}

.anki-table th {
  background: var(--anki-surface-soft);
  color: var(--anki-text);
}

.anki-table .num,
.anki-num {
  text-align: center;
}

.deck-row {
  cursor: pointer;
}

.deck-row:hover {
  background: var(--anki-surface-soft);
}

.deck-row.active {
  background: var(--anki-primary-weak);
}

.anki-deck-name {
  font-weight: 600;
}

.anki-home-hint {
  color: var(--anki-muted);
  font-size: 13px;
}

.home-study-time-box {
  margin: 8px 0 12px;
  border: 1px solid var(--anki-border);
  border-radius: 12px;
  padding: 10px 12px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--anki-primary) 10%, var(--anki-surface)), var(--anki-surface));
  display: flex;
  align-items: center;
  gap: 10px;
}

.home-study-time-label {
  font-size: 12px;
  color: var(--anki-muted);
  font-weight: 700;
}

.home-study-time-value {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--anki-text);
}

.home-study-time-hint {
  margin-left: auto;
  font-size: 11px;
  color: var(--anki-muted);
}

.study-top {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}

.study-stats {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

.study-card {
  margin-top: 8px;
}

.hr {
  border-top: 1px dashed var(--anki-border);
  margin: 10px 0;
}

.big-front,
.back {
  min-height: 120px;
  border: 1px solid var(--anki-border);
  border-radius: 12px;
  padding: 14px;
  background: var(--anki-surface);
}

.back {
  margin-top: 10px;
  display: none;
}

.rate {
  font-size: 12px;
  color: var(--anki-muted);
}

.stats-hero {
  display: grid;
  gap: 10px;
  grid-template-columns: 1fr 1fr;
  margin-top: 10px;
}

.stats-sync-card {
  border: 1px solid var(--anki-border);
  border-radius: 12px;
  padding: 12px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--anki-primary) 10%, var(--anki-surface)), var(--anki-surface));
}

.stats-section-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.stats-section-title {
  font-size: 1.02rem;
  font-weight: 800;
  margin-bottom: 4px;
}

.stats-chip-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.streak-box,
.today-box {
  border: 1px solid var(--anki-border);
  border-radius: 12px;
  padding: 10px;
  background: var(--anki-surface);
}

.streak-box {
  display: flex;
  align-items: center;
  gap: 10px;
}

.streak-num {
  font-size: 1.3rem;
  font-weight: 800;
}

.today-stat {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.today-num {
  font-size: 1.25rem;
  font-weight: 800;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.stats-grid-strong {
  margin-top: 10px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.stat-item {
  border: 1px solid var(--anki-border);
  border-radius: 12px;
  padding: 10px;
  background: var(--anki-surface);
  text-align: center;
}

.stat-icon {
  width: 34px;
  height: 34px;
  margin: 0 auto 8px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  font-size: 16px;
  background: var(--anki-surface-soft);
}

.stat-icon.new { background: color-mix(in srgb, #60a5fa 18%, var(--anki-surface)); }
.stat-icon.review { background: color-mix(in srgb, #38bdf8 18%, var(--anki-surface)); }
.stat-icon.learn { background: color-mix(in srgb, #f59e0b 18%, var(--anki-surface)); }
.stat-icon.hard { background: color-mix(in srgb, #ef4444 16%, var(--anki-surface)); }
.stat-icon.easy { background: color-mix(in srgb, #14b8a6 18%, var(--anki-surface)); }
.stat-icon.mastered { background: color-mix(in srgb, #8b5cf6 18%, var(--anki-surface)); }
.stat-icon.total { background: color-mix(in srgb, #6366f1 18%, var(--anki-surface)); }

.stat-value {
  font-size: 1.2rem;
  font-weight: 700;
}

.stats-summary {
  margin-top: 10px;
  color: var(--anki-muted);
  font-size: 13px;
}

.card-distribution {
  border: 1px solid var(--anki-border);
  border-radius: 12px;
  padding: 10px;
  background: var(--anki-surface);
}

.dist-bar {
  height: 16px;
  display: flex;
  border-radius: 999px;
  overflow: hidden;
  background: var(--anki-surface-strong);
}

.dist-segment.new { background: #60a5fa; }
.dist-segment.learn { background: #f59e0b; }
.dist-segment.young { background: #22c55e; }
.dist-segment.mature { background: #a78bfa; }

.dist-legend {
  margin-top: 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
}

.legend-item {
  font-size: 12px;
  color: var(--anki-muted);
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  margin-right: 4px;
}

.dot.new { background: #60a5fa; }
.dot.learn { background: #f59e0b; }
.dot.young { background: #22c55e; }
.dot.mature { background: #a78bfa; }

.dist-total {
  margin-top: 8px;
  font-size: 13px;
}

.card-focus-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 10px;
}

.card-focus-card {
  border: 1px solid var(--anki-border);
  border-radius: 14px;
  padding: 12px;
  background: var(--anki-surface);
}

.card-focus-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 8px;
}

.card-focus-title {
  font-weight: 800;
  margin-bottom: 4px;
}

.card-focus-desc {
  color: var(--anki-muted);
  font-size: 12px;
  line-height: 1.45;
}

.card-focus-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  min-height: 38px;
}

.card-focus-pill {
  border: 1px solid var(--anki-border);
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 12px;
  line-height: 1.3;
  background: var(--anki-surface-soft);
}

.card-focus-pill.deck {
  background: color-mix(in srgb, var(--anki-primary) 10%, var(--anki-surface));
}

.card-focus-empty {
  color: var(--anki-muted);
  font-size: 13px;
}

.card-focus-toggle {
  margin-top: 10px;
  padding: 7px 10px;
}

.cal-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.heatmap {
  display: grid;
  grid-template-columns: repeat(53, 1fr);
  gap: 2px;
  border: 1px solid var(--anki-border);
  border-radius: 10px;
  padding: 8px;
  background: var(--anki-surface);
}

.cell {
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 3px;
  background: var(--anki-surface-soft);
}

.cell.l1 { background: #bbf7d0; }
.cell.l2 { background: #86efac; }
.cell.l3 { background: #4ade80; }
.cell.l4 { background: #16a34a; }

.heatmap-legend {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-top: 6px;
  color: var(--anki-muted);
  font-size: 12px;
}

#focusStudyOverlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(2px);
  display: none;
  align-items: stretch;
  justify-content: center;
  padding: 10px;
}

#focusStudyOverlay.active {
  display: flex;
}

.focus-wrap {
  width: min(1080px, 100%);
  height: 100%;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.focus-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

.focus-title {
  display: flex;
  align-items: center;
  gap: 6px;
  color: #fff;
  font-weight: 700;
}

.focus-right {
  display: flex;
  align-items: center;
  gap: 6px;
}

.focus-right .badge {
  background: var(--anki-surface);
}

.focus-card {
  flex: 1 1 auto;
  min-height: 0;
  border: 1px solid var(--anki-border);
  border-radius: 16px;
  background: var(--anki-surface);
  padding: 14px;
  overflow: auto;
}

.focus-front,
.focus-back {
  border: 1px solid var(--anki-border);
  border-radius: 12px;
  padding: 16px;
  min-height: 140px;
  background: var(--anki-surface);
}

.focus-back {
  margin-top: 10px;
  display: none;
}

.focus-hint {
  margin-top: 8px;
  color: var(--anki-muted);
  font-size: 13px;
}

.focus-done {
  margin-top: 10px;
  border: 1px solid #bbf7d0;
  background: #ecfdf5;
  color: #166534;
  border-radius: 10px;
  padding: 10px;
}

.focus-bottom {
  position: sticky;
  bottom: 0;
  z-index: 2;
  border: 1px solid var(--anki-border);
  border-radius: 14px;
  background: rgba(15, 23, 42, 0.9);
  color: #e5e7eb;
  margin-top: auto;
}

.focus-bottom .inner {
  padding: 10px;
}

.focus-counts {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 1.15rem;
  font-weight: 700;
}

.focus-counts .num {
  min-width: 52px;
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 12px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.06);
  transition: transform .16s ease, box-shadow .16s ease, opacity .16s ease, background-color .16s ease;
}

.focus-counts .num.new { color: #93c5fd; }
.focus-counts .num.learn { color: #fcd34d; }
.focus-counts .num.rev { color: #86efac; }
.focus-counts .plus {
  color: #94a3b8;
  font-weight: 700;
  opacity: .9;
}

.focus-counts.active-new .num,
.focus-counts.active-learn .num,
.focus-counts.active-rev .num {
  opacity: .5;
}

.focus-counts.active-new .num.new,
.focus-counts.active-learn .num.learn,
.focus-counts.active-rev .num.rev {
  opacity: 1;
  transform: translateY(-1px) scale(1.04);
  border-color: rgba(255, 255, 255, 0.75);
  background: rgba(255, 255, 255, 0.18);
  box-shadow: 0 8px 20px rgba(2, 6, 23, 0.35);
}

.focus-counts.active-new + .focus-labels span:nth-child(1),
.focus-counts.active-learn + .focus-labels span:nth-child(2),
.focus-counts.active-rev + .focus-labels span:nth-child(3) {
  color: #ffffff;
  font-weight: 700;
}

.focus-counts.pulse {
  animation: countPulse .25s ease;
}

@keyframes countPulse {
  from { transform: scale(0.98); }
  to { transform: scale(1); }
}

.focus-labels {
  margin-top: 6px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  text-align: center;
  font-size: 12px;
  color: #cbd5e1;
}

.focus-grade {
  margin-top: 10px;
  display: none;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 6px;
}

.focus-bottom.show-grades .focus-grade {
  display: grid;
}

.grade-btn {
  width: 100%;
  font-weight: 800;
  min-height: 54px;
  border-width: 1px;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.18), 0 10px 24px rgba(15, 23, 42, 0.18);
}

.grade-btn small {
  display: block;
  margin-top: 3px;
}

.grade-again { border-color: #fb7185; background: linear-gradient(180deg, #ef4444 0%, #b91c1c 100%); }
.grade-hard { border-color: #fbbf24; background: linear-gradient(180deg, #fbbf24 0%, #d97706 100%); }
.grade-good { border-color: #60a5fa; background: linear-gradient(180deg, #3b82f6 0%, #1d4ed8 100%); }
.grade-easy { border-color: #34d399; background: linear-gradient(180deg, #10b981 0%, #047857 100%); }
.grade-again,
.grade-hard,
.grade-good,
.grade-easy {
  transform: translateY(0);
}
.grade-again,
.grade-good,
.grade-easy {
  color: #f8fafc;
  text-shadow: 0 1px 2px rgba(15, 23, 42, 0.28);
}
.grade-hard {
  color: #1f2937;
}
.grade-again small,
.grade-good small,
.grade-easy small {
  color: rgba(248, 250, 252, 0.82);
}
.grade-hard small {
  color: rgba(31, 41, 55, 0.78);
}

.bottom-chips {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 100;
  background: var(--anki-surface);
  border-top: 1px solid var(--anki-border);
  backdrop-filter: blur(6px);
  padding: 8px 10px;
}

.bottom-chips .wrap {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.counts-wrap {
  margin-bottom: 6px;
}

.chip {
  border: 1px solid var(--anki-border);
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 12px;
  background: var(--anki-surface);
}

.chip.active {
  border-color: var(--anki-primary);
  background: var(--anki-primary-weak);
}

#bottomGradeWrap {
  display: none;
}

.bottom-chips.show-grades #bottomGradeWrap {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 6px;
}

@media (max-width: 820px) {
  body {
    padding: 14px 12px 124px;
  }
  .study-top {
    flex-direction: column;
  }
  .stats-grid {
    grid-template-columns: 1fr;
  }
  .stats-grid-strong {
    grid-template-columns: 1fr 1fr;
  }
  .stats-hero {
    grid-template-columns: 1fr;
  }
  .stats-section-head {
    flex-direction: column;
  }
  .card-focus-grid {
    grid-template-columns: 1fr;
  }
  .home-study-time-box {
    flex-wrap: wrap;
    row-gap: 6px;
  }
  .home-study-time-hint {
    margin-left: 0;
    width: 100%;
  }
  .heatmap {
    grid-template-columns: repeat(27, 1fr);
  }
  .bottom-chips.show-grades #bottomGradeWrap {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .stats-grid-strong {
    grid-template-columns: 1fr;
  }
}