:root {
  color-scheme: light dark;
  --bg: #f6f7fb;
  --fg: #141822;
  --muted: #5c6475;
  --border: #cfd6e6;
  --card: #ffffff;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-fg: #ffffff;
  --accent-soft: rgba(37, 99, 235, 0.12);
  --warn-bg: #fff4e0;
  --warn-border: #e3a008;
  --radius: 10px;
  font-family:
    system-ui,
    -apple-system,
    'Segoe UI',
    Roboto,
    Ubuntu,
    Cantarell,
    'Noto Sans',
    sans-serif;
  line-height: 1.55;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f121a;
    --fg: #e8eaf2;
    --muted: #9aa3b8;
    --border: #2b3244;
    --card: #171c28;
    --accent: #6b8cff;
    --accent-hover: #8ca8ff;
    --accent-fg: #0b1020;
    --accent-soft: rgba(107, 140, 255, 0.18);
    --warn-bg: #2b2210;
    --warn-border: #c9981a;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
}

.top {
  padding: 1rem 1.25rem 0.5rem;
  max-width: 52rem;
  margin: 0 auto;
}

.title {
  margin: 0 0 0.25rem;
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  font-weight: 650;
}

.counts {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.dashboard {
  max-width: 52rem;
  margin: 0 auto;
  padding: 0.5rem 1.25rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.dashboard-intro {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 4px);
  padding: 1rem 1.1rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.dashboard-title {
  margin: 0 0 0.35rem;
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
  font-weight: 650;
}

.dashboard-lede {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.dashboard-total {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
}

.progress-summary {
  margin: -0.25rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.dashboard-cluster {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.cluster-heading {
  margin: 0;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.cluster-hint {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
  max-width: 42rem;
}

.hint-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 650;
  padding: 0.12rem 0.4rem;
  border-radius: 999px;
  border: 1px solid var(--warn-border);
  background: var(--warn-bg);
  color: var(--fg);
  vertical-align: middle;
  margin-right: 0.2rem;
}

.pill-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.pill-grid--dense .pill {
  font-size: 0.78rem;
}

.pill {
  font: inherit;
  cursor: pointer;
  border-radius: 999px;
  border: 1px solid var(--border);
  padding: 0.45rem 0.75rem;
  background: var(--card);
  color: var(--fg);
  max-width: 100%;
  text-align: left;
  line-height: 1.25;
  transition:
    border-color 0.12s ease,
    background 0.12s ease,
    box-shadow 0.12s ease;
}

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

.pill:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.pill--track {
  font-weight: 600;
  padding: 0.55rem 0.95rem;
}

.pill--active {
  border-color: var(--accent);
  background: var(--accent-soft);
  box-shadow: 0 0 0 1px var(--accent);
}

.subject-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
}

.track-section-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 0.85rem;
}

.track-section {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.track-section-heading {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 700;
}

.track-section--active .track-section-heading {
  color: var(--accent);
}

.subject-table {
  width: 100%;
  min-width: 18rem;
  border-collapse: separate;
  border-spacing: 0 0.35rem;
  font-size: 0.86rem;
}

.subject-table th,
.subject-table td {
  padding: 0.45rem 0.55rem;
  text-align: right;
  white-space: nowrap;
}

.subject-table th:first-child,
.subject-table td:first-child {
  text-align: left;
}

.subject-table th:first-child {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.subject-checkbox {
  width: 1rem;
  height: 1rem;
  margin: 0;
  accent-color: var(--accent);
  flex: 0 0 auto;
  pointer-events: none;
}

.subject-table thead th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--card);
  color: var(--muted);
  font-size: 0.74rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.subject-row {
  cursor: pointer;
  background: var(--card);
  outline: 1px solid var(--border);
  border-radius: var(--radius);
  transition:
    background 0.12s ease,
    box-shadow 0.12s ease,
    outline-color 0.12s ease;
}

.subject-row th,
.subject-row td {
  padding-top: 0.65rem;
  padding-bottom: 0.65rem;
}

.subject-row th:first-child {
  border-top-left-radius: var(--radius);
  border-bottom-left-radius: var(--radius);
}

.subject-row td:last-child {
  border-top-right-radius: var(--radius);
  border-bottom-right-radius: var(--radius);
}

.subject-row:hover,
.subject-row:focus-visible {
  background: var(--accent-soft);
  outline-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}

.subject-row--active {
  background: var(--accent-soft);
  box-shadow: inset 3px 0 0 var(--accent);
}

.subject-row--active th {
  color: var(--accent);
}

.dashboard-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.active-chips {
  max-width: 52rem;
  margin: 0 auto;
  padding: 0 1.25rem 0.75rem;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 0.5rem;
}

.active-chips-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--muted);
  padding-top: 0.35rem;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  flex: 1;
  min-width: 0;
}

.chip {
  font: inherit;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  padding: 0.28rem 0.55rem 0.28rem 0.75rem;
  background: var(--card);
  color: var(--fg);
  max-width: 100%;
}

.chip-label {
  overflow-wrap: anywhere;
  font-size: 0.82rem;
}

.chip-remove {
  font-size: 1.05rem;
  line-height: 1;
  font-weight: 700;
  color: var(--muted);
}

.chip:hover {
  border-color: var(--muted);
}

.chip:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.controls {
  max-width: 52rem;
  margin: 0 auto;
  padding: 0.25rem 1.25rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.controls-heading {
  margin: 0.25rem 0 0;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 0;
}

.label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
}

input[type='search'],
select,
.btn {
  font: inherit;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 0.45rem 0.65rem;
  background: var(--card);
  color: var(--fg);
  width: 100%;
  max-width: 100%;
}

input[type='search']:focus,
select:focus,
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.filters {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr));
  gap: 0.65rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.btn {
  cursor: pointer;
  width: auto;
  border-color: var(--border);
  background: var(--card);
}

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

.btn-secondary {
  font-size: 0.9rem;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-fg);
  border-color: transparent;
  font-weight: 600;
}

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

.btn-wide {
  min-width: min(100%, 14rem);
}

.btn-study {
  flex: 1 1 8rem;
  min-width: 0;
}

.main {
  max-width: 52rem;
  margin: 0 auto;
  padding: 0 1.25rem 2rem;
}

.empty {
  padding: 1.25rem;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  color: var(--muted);
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  align-items: flex-start;
}

.empty-message {
  margin: 0;
}

.card-panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 4px);
  padding: 1rem 1.1rem 1.15rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.card-panel--quick-fixed {
  border-color: var(--warn-border);
  box-shadow: 0 0 0 1px var(--warn-border);
}

.card-position {
  margin: 0 0 0.65rem;
  font-size: 0.92rem;
  font-weight: 650;
  color: var(--muted);
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.65rem;
}

.badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.45rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--muted);
}

.badge--quick-fixed {
  background: var(--warn-bg);
  border-color: var(--warn-border);
  color: var(--fg);
}

.html-block {
  font-size: clamp(0.95rem, 2.4vw, 1.05rem);
  overflow-wrap: anywhere;
}

.html-block :is(p, ul, ol) {
  margin: 0.5rem 0;
}

.answer-panel {
  margin-top: 1rem;
  padding: 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--card) 92%, var(--accent-soft));
}

.answer-heading {
  margin: 0 0 0.5rem;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.choice-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 0.45rem;
}

.choice-btn {
  font: inherit;
  cursor: pointer;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 0.55rem 0.4rem;
  background: var(--card);
  color: var(--fg);
  font-weight: 700;
}

.choice-btn:hover,
.choice-btn:focus-visible {
  border-color: var(--accent);
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.choice-btn--selected {
  border-color: var(--accent);
  background: var(--accent-soft);
  box-shadow: 0 0 0 1px var(--accent);
}

.answer-status {
  margin: 0.55rem 0 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.answer-status--correct {
  color: #047857;
  font-weight: 650;
}

.answer-status--wrong {
  color: #b91c1c;
  font-weight: 650;
}

.answer-status--not_sure,
.answer-status--ungraded {
  color: var(--muted);
  font-weight: 650;
}

.study-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 1rem 0 0.85rem;
}

.study-reveal {
  flex: 1 1 10rem;
  display: flex;
  justify-content: center;
  min-width: 0;
}

.study-reveal .btn-study {
  flex: 1 1 auto;
}

.keyboard-hint {
  margin: 0 0 0.85rem;
  font-size: 0.78rem;
  color: var(--muted);
}

.keyboard-hint-label {
  font-weight: 600;
  color: var(--muted);
}

.meta {
  margin-top: 1rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
  color: var(--muted);
}

.meta strong {
  color: var(--fg);
}

.tags-list {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.82rem;
  word-break: break-all;
}

@media (max-width: 520px) {
  .choice-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.hidden {
  display: none !important;
}

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