:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --surface: #ffffff;
  --surface-strong: #f0f4f8;
  --text: #17202a;
  --muted: #657080;
  --line: #dce3ea;
  --accent: #00a1c7;
  --accent-strong: #007ea0;
  --danger: #c2415b;
  --warning: #c27a12;
  --success: #2f8f68;
  --shadow: 0 18px 45px rgba(31, 45, 61, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.45;
}

button,
input,
select {
  font: inherit;
}

.app-shell {
  min-height: 100vh;
  padding: 24px;
}

.topbar {
  align-items: center;
  display: flex;
  gap: 24px;
  justify-content: space-between;
  margin: 0 auto 24px;
  max-width: 1440px;
}

.eyebrow {
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  margin: 0 0 4px;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  font-size: clamp(2rem, 4vw, 3.8rem);
  line-height: 1;
  margin-bottom: 0;
}

h2 {
  font-size: 1rem;
  margin-bottom: 0;
}

.sync-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  min-width: min(420px, 100%);
  padding: 16px;
}

label {
  color: var(--muted);
  display: block;
  font-size: 0.82rem;
  font-weight: 750;
  margin-bottom: 8px;
}

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

.sync-status {
  color: var(--muted);
  font-size: 0.82rem;
  margin: 10px 0 0;
}

.sync-status.error {
  color: var(--danger);
}

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

input,
select {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--text);
  min-height: 42px;
  padding: 0 12px;
  width: 100%;
}

button {
  background: var(--accent);
  border: 0;
  border-radius: 6px;
  color: #fff;
  font-weight: 800;
  min-height: 42px;
  padding: 0 16px;
}

button:disabled,
input:disabled {
  cursor: not-allowed;
  opacity: 0.62;
}

main {
  margin: 0 auto;
  max-width: 1440px;
}

.dashboard {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  margin-bottom: 16px;
}

.metric-card,
.srs-band,
.filters,
.kanji-panel,
.detail-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.metric-card {
  min-height: 130px;
  padding: 20px;
}

.metric-card[data-top-filter],
.srs-item[data-srs-card] {
  cursor: pointer;
}

.metric-card.active,
.srs-item.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(0, 161, 199, 0.18), var(--shadow);
}

.metric-card[data-top-filter]:focus-visible,
.srs-item[data-srs-card]:focus-visible {
  outline: 3px solid rgba(0, 161, 199, 0.32);
  outline-offset: 3px;
}

.level-card {
  background: #10263a;
  color: #fff;
}

.metric-label {
  color: var(--muted);
  display: block;
  font-size: 0.82rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.level-card .metric-label,
.level-card small {
  color: #b7d3df;
}

.metric-card strong {
  display: block;
  font-size: 2.6rem;
  line-height: 1;
  margin-bottom: 10px;
}

.metric-card small {
  color: var(--muted);
}

.srs-band {
  margin-bottom: 16px;
  padding: 18px;
}

.section-heading {
  align-items: center;
  display: flex;
  gap: 12px;
  justify-content: space-between;
  margin-bottom: 16px;
}

.section-heading span {
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 750;
}

.heading-actions {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

.segmented-control {
  background: var(--surface-strong);
  border: 1px solid var(--line);
  border-radius: 8px;
  display: inline-flex;
  gap: 2px;
  padding: 3px;
}

.segment-button {
  background: transparent;
  border-radius: 6px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 850;
  min-height: 30px;
  padding: 0 10px;
}

.segment-button.active {
  background: #10263a;
  color: #fff;
}

.srs-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.srs-item {
  background: var(--surface-strong);
  border-radius: 8px;
  padding: 14px;
}

.srs-item.Lesson {
  background: #eef8fb;
}

.srs-item.Apprentice {
  background: #ffe8ed;
}

.srs-item.Guru {
  background: #fff4d9;
}

.srs-item.Master {
  background: #e5f4ff;
}

.srs-item.Enlightened {
  background: #e8f7ef;
}

.srs-item.Burned {
  background: #eceff3;
}

.srs-item strong {
  display: block;
  font-size: 1.55rem;
}

.srs-item span {
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 750;
}

.srs-item small {
  color: var(--muted);
  display: block;
  font-size: 0.74rem;
  font-weight: 750;
  margin-top: 4px;
}

.srs-bar {
  background: #d8e3ea;
  border-radius: 999px;
  height: 7px;
  margin-top: 12px;
  overflow: hidden;
}

.srs-bar i {
  background: var(--accent);
  display: block;
  height: 100%;
}

.srs-item.Lesson .srs-bar i {
  background: var(--accent-strong);
}

.srs-item.Apprentice .srs-bar i {
  background: var(--danger);
}

.srs-item.Guru .srs-bar i {
  background: var(--warning);
}

.srs-item.Master .srs-bar i {
  background: #1769a3;
}

.srs-item.Enlightened .srs-bar i {
  background: var(--success);
}

.srs-item.Burned .srs-bar i {
  background: #4b5563;
}

.workspace {
  align-items: start;
  display: grid;
  gap: 16px;
  grid-template-columns: 220px minmax(620px, 1fr) 340px;
}

.filters,
.kanji-panel,
.detail-panel {
  padding: 18px;
}

.filters {
  position: sticky;
  top: 16px;
}

.detail-panel {
  max-height: calc(100vh - 32px);
  overflow: auto;
  position: sticky;
  top: 16px;
}

.filters input,
.filters select {
  margin-bottom: 16px;
}

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

.search-row input {
  margin-bottom: 0;
}

.mode-button {
  background: #10263a;
  min-width: 48px;
  padding: 0 12px;
}

.mode-button[aria-pressed="true"] {
  background: var(--accent);
}

.input-hint {
  color: var(--muted);
  font-size: 0.78rem;
  margin: 8px 0 16px;
}

.filter-group {
  border-bottom: 1px solid var(--line);
  border-top: 1px solid var(--line);
  margin-bottom: 16px;
  padding: 12px 0;
}

.filter-group-title {
  color: var(--muted);
  display: block;
  font-size: 0.76rem;
  font-weight: 850;
  margin-bottom: 8px;
  text-transform: uppercase;
}

.check-row {
  align-items: center;
  color: var(--text);
  display: flex;
  gap: 8px;
  font-size: 0.86rem;
  font-weight: 750;
  margin-bottom: 0;
}

.check-row input {
  min-height: auto;
  width: auto;
}

mark {
  background: #fff4a8;
  border-radius: 3px;
  color: inherit;
  padding: 0 2px;
}

.focus-box {
  background: #eef8fb;
  border: 1px solid #c8e7ef;
  border-radius: 8px;
  padding: 14px;
}

.focus-box span {
  color: var(--accent-strong);
  display: block;
  font-size: 0.78rem;
  font-weight: 800;
  margin-bottom: 6px;
  text-transform: uppercase;
}

.focus-box strong {
  display: block;
  font-size: 0.95rem;
}

.kanji-cell {
  align-items: center;
  display: flex;
  gap: 10px;
}

.kanji-glyph {
  background: #111827;
  border-radius: 8px;
  color: #fff;
  display: grid;
  font-size: clamp(0.9rem, 1.2em, 1.55rem);
  height: 48px;
  line-height: 1;
  min-width: 48px;
  overflow: hidden;
  padding: 0 6px;
  place-items: center;
  width: fit-content;
  max-width: 96px;
  word-break: keep-all;
}

.kanji-glyph.large {
  font-size: clamp(1.15rem, 1.7em, 2rem);
  height: 64px;
  min-width: 64px;
  padding: 0 8px;
  max-width: 132px;
  width: 64px;
}

.detail-hero .kanji-glyph {
  font-size: clamp(1.2rem, 1.8em, 2.8rem);
  min-width: 86px;
  max-width: 170px;
  padding: 0 10px;
  width: fit-content;
}

.subtle {
  color: var(--muted);
  display: block;
  font-size: 0.78rem;
}

.pill {
  background: var(--surface-strong);
  border-radius: 999px;
  display: inline-flex;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 5px 10px;
  white-space: nowrap;
}

.pill.Apprentice {
  background: #ffe8ed;
  color: var(--danger);
}

.pill.Guru {
  background: #fff4d9;
  color: var(--warning);
}

.pill.Master {
  background: #e5f4ff;
  color: #1769a3;
}

.pill.Enlightened {
  background: #e8f7ef;
  color: var(--success);
}

.pill.Burned {
  background: #eceff3;
  color: #4b5563;
}

.pill.Lesson {
  background: #eef8fb;
  color: var(--accent-strong);
}

.accuracy {
  font-weight: 850;
}

.accuracy.low {
  color: var(--danger);
}

.detail-hero {
  align-items: center;
  display: flex;
  gap: 16px;
  margin-bottom: 18px;
}

.detail-hero .kanji-glyph {
  height: 86px;
}

.detail-hero h2 {
  font-size: 1.5rem;
}

.detail-link {
  color: var(--accent-strong);
  display: inline-block;
  font-size: 0.84rem;
  font-weight: 800;
  margin-top: 10px;
  text-decoration: none;
}

.detail-meta {
  display: grid;
  gap: 10px;
  grid-template-columns: 1fr 1fr;
  margin-bottom: 20px;
}

.meta-item {
  background: var(--surface-strong);
  border-radius: 8px;
  padding: 12px;
}

.meta-item span {
  color: var(--muted);
  display: block;
  font-size: 0.76rem;
  font-weight: 800;
  margin-bottom: 4px;
  text-transform: uppercase;
}

.relation-group {
  border-top: 1px solid var(--line);
  padding: 16px 0;
}

.relation-group:last-child {
  padding-bottom: 0;
}

.relation-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.relation-chip {
  align-items: center;
  background: var(--surface-strong);
  border: 0;
  border-radius: 8px;
  color: var(--text);
  cursor: pointer;
  display: inline-flex;
  gap: 8px;
  min-height: 38px;
  padding: 8px 10px;
}

.relation-chip b {
  font-size: 1.2rem;
}

.vocabulary-list {
  display: grid;
  gap: 8px;
}

.vocabulary-row {
  align-items: center;
  background: var(--surface-strong);
  border: 0;
  border-radius: 8px;
  color: var(--text);
  cursor: pointer;
  display: grid;
  gap: 8px;
  grid-template-columns: minmax(64px, auto) 1fr;
  min-height: 48px;
  padding: 10px;
  text-align: left;
}

.vocabulary-row b {
  font-size: 1.25rem;
}

.vocabulary-row span {
  display: block;
}

.vocabulary-row .subtle {
  margin-top: 2px;
}

.empty-state {
  color: var(--muted);
  margin-bottom: 0;
}

.card-list {
  display: grid;
  gap: 12px;
}

.review-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}

.review-card.selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(0, 161, 199, 0.12);
}

.review-card-main {
  align-items: center;
  background: #fff;
  color: var(--text);
  cursor: pointer;
  display: grid;
  gap: 12px;
  grid-template-columns: auto minmax(0, 1fr) auto auto;
  min-height: 86px;
  padding: 14px;
  text-align: left;
  width: 100%;
}

.review-card-title strong {
  display: block;
  font-size: 1.05rem;
  margin-bottom: 4px;
}

.reading-grid {
  border-top: 1px solid var(--line);
  display: grid;
  gap: 1px;
  grid-template-columns: 1fr 1fr;
}

.reading-box {
  background: var(--surface-strong);
  padding: 12px 14px;
}

.reading-box span,
.card-subheading span {
  color: var(--muted);
  display: block;
  font-size: 0.74rem;
  font-weight: 850;
  margin-bottom: 4px;
  text-transform: uppercase;
}

.reading-box strong {
  font-size: 1rem;
}

.card-vocabulary {
  border-top: 1px solid var(--line);
  padding: 12px 14px 14px;
}

.card-subheading {
  align-items: center;
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
}

.card-subheading small {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 850;
}

.vocabulary-mini-list {
  display: grid;
  gap: 6px;
}

.vocabulary-mini-row {
  align-items: center;
  background: var(--surface-strong);
  border: 0;
  border-radius: 6px;
  color: var(--text);
  cursor: pointer;
  display: grid;
  gap: 10px;
  grid-template-columns: minmax(52px, auto) minmax(0, 1fr) minmax(72px, auto) auto;
  min-height: 38px;
  padding: 8px 10px;
  text-align: left;
}

.vocabulary-mini-row b {
  font-size: 1.05rem;
}

.vocabulary-mini-row strong {
  font-size: 0.9rem;
}

@media (max-width: 1180px) {
  .topbar,
  .workspace {
    grid-template-columns: 1fr;
  }

  .topbar {
    align-items: stretch;
    flex-direction: column;
  }

  .dashboard,
  .srs-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .filters {
    position: static;
  }
}

@media (max-width: 720px) {
  .app-shell {
    padding: 14px;
  }

  .dashboard,
  .srs-grid,
  .detail-meta {
    grid-template-columns: 1fr;
  }

  .token-row {
    flex-direction: column;
  }

  h1 {
    font-size: 2.2rem;
  }
}