:root {
  color-scheme: light;
  --page: #f9f9f7;
  --surface: #fcfcfb;
  --ink: #0b0b0b;
  --ink-2: #52514e;
  --muted: #898781;
  --grid: #e1e0d9;
  --axis: #c3c2b7;
  --ring: rgba(11, 11, 11, 0.10);
  --accent: #2a78d6;
  --accent-soft: #cde2fb;
  --context: #c3c2b7;
  --wash: rgba(42, 120, 214, 0.08);
  --font: system-ui, -apple-system, "Segoe UI", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:where(:not([data-theme="light"])) {
    color-scheme: dark;
    --page: #0d0d0d;
    --surface: #1a1a19;
    --ink: #ffffff;
    --ink-2: #c3c2b7;
    --muted: #898781;
    --grid: #2c2c2a;
    --axis: #383835;
    --ring: rgba(255, 255, 255, 0.10);
    --accent: #3987e5;
    --accent-soft: #184f95;
    --context: #4a4a46;
    --wash: rgba(57, 135, 229, 0.14);
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #0d0d0d;
  --surface: #1a1a19;
  --ink: #ffffff;
  --ink-2: #c3c2b7;
  --muted: #898781;
  --grid: #2c2c2a;
  --axis: #383835;
  --ring: rgba(255, 255, 255, 0.10);
  --accent: #3987e5;
  --accent-soft: #184f95;
  --context: #4a4a46;
  --wash: rgba(57, 135, 229, 0.14);
}

/* CJK font stacks: the browser picks glyph shapes by language, so name the right fonts for each. */
:root:lang(zh) {
  --font: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Noto Sans SC", sans-serif;
}
:root:lang(ja) {
  --font: system-ui, -apple-system, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", Meiryo, "Noto Sans CJK JP", "Noto Sans JP", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font: 15px/1.5 var(--font);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 24px; }

.page-header { padding: 40px 0 20px; }
h1 { font-size: 30px; line-height: 1.2; margin: 0 0 8px; letter-spacing: -0.01em; }
.lede { margin: 0 0 16px; color: var(--ink-2); max-width: 70ch; }
.jump { display: flex; flex-wrap: wrap; gap: 4px 18px; font-size: 14px; }
.jump a { color: var(--ink-2); }
.jump .repo { margin-left: auto; }
.lang-select { height: 28px; font-size: 13px; padding: 0 6px; margin-top: -4px; color: var(--ink-2); }

.filters {
  position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--page) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--grid);
}
.filter-row { display: flex; flex-wrap: wrap; align-items: flex-end; gap: 12px; padding-top: 12px; padding-bottom: 12px; }
.field { display: flex; flex-direction: column; gap: 4px; font-size: 12px; color: var(--muted); min-width: 150px; }
.field.grow { flex: 1 1 240px; }
select, input[type="search"], button {
  font: inherit; font-size: 14px; color: var(--ink);
  background: var(--surface); border: 1px solid var(--axis); border-radius: 8px;
  height: 36px; padding: 0 10px;
}
select:focus-visible, input:focus-visible, button:focus-visible, .topic-row:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 1px;
}
button { cursor: pointer; }
button:hover { background: var(--wash); }
.reset { color: var(--ink-2); }

main { display: flex; flex-direction: column; gap: 20px; padding-top: 20px; padding-bottom: 32px; }
.tiles { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.tile, .card {
  background: var(--surface); border-radius: 12px; box-shadow: 0 0 0 1px var(--ring);
}
.tile { padding: 14px 18px; display: flex; flex-direction: column; gap: 2px; }
.tile-label { font-size: 13px; color: var(--ink-2); }
.tile-value { font-size: 28px; font-weight: 600; line-height: 1.2; }
.card { padding: 20px 22px; min-width: 0; }
.card-head { margin-bottom: 12px; }
h2 { font-size: 17px; margin: 0 0 4px; }
.note { margin: 0; font-size: 13px; color: var(--ink-2); max-width: 80ch; }
.stack { display: flex; flex-direction: column; gap: 20px; }
.chart { width: 100%; }
.chart-legend { margin: 0 0 2px 40px; font-size: 11px; color: var(--muted); }
svg { display: block; overflow: visible; }
svg text { font-family: var(--font); }
.axis text { fill: var(--muted); font-size: 11px; font-variant-numeric: tabular-nums; }
.axis .domain { stroke: var(--axis); }
.axis .tick line { stroke: var(--grid); }

.map-frame { position: relative; width: 100%; aspect-ratio: 16 / 10; max-height: 720px; min-height: 360px; }
.map-frame canvas { position: absolute; inset: 0; width: 100%; height: 100%; cursor: crosshair; }
.map-frame svg { position: absolute; inset: 0; pointer-events: none; }
.cluster-label {
  font-size: 12px; font-weight: 600; fill: var(--ink-2);
  paint-order: stroke; stroke: var(--surface); stroke-width: 4px; stroke-linejoin: round;
}

.topic-row {
  display: grid; grid-template-columns: minmax(120px, 260px) 1fr 52px var(--spark-w, 84px); align-items: center; gap: 10px;
  width: 100%; padding: 5px 6px; border: 0; border-radius: 6px; background: none; height: auto;
  text-align: left; font-size: 13px; color: var(--ink);
}
.topic-row:hover { background: var(--wash); }
.topic-row.active { background: var(--wash); font-weight: 600; }
.topic-row .bar-track { height: 10px; }
.topic-row .bar { height: 10px; border-radius: 0 4px 4px 0; background: var(--accent); min-width: 2px; }
.topic-row .count { text-align: right; font-variant-numeric: tabular-nums; color: var(--ink-2); }
.topic-head { display: grid; grid-template-columns: minmax(120px, 260px) 1fr 52px var(--spark-w, 84px); gap: 10px; padding: 0 6px 4px; font-size: 11px; color: var(--muted); }
.topic-head span:nth-child(3) { text-align: right; }
.pair-row { display: grid; grid-template-columns: 1.6fr 1fr 44px; align-items: center; gap: 10px; padding: 6px 0; font-size: 13px; border-bottom: 1px solid var(--grid); }
.pair-row .bar { display: block; height: 10px; border-radius: 0 4px 4px 0; background: var(--accent); min-width: 2px; }
.pair-row .count { text-align: right; font-variant-numeric: tabular-nums; color: var(--ink-2); }

.node-label { font-size: 11px; fill: var(--ink); paint-order: stroke; stroke: var(--surface); stroke-width: 3px; stroke-linejoin: round; pointer-events: none; }
.net-link { stroke: var(--axis); stroke-linecap: round; }
.net-node { fill: var(--accent); stroke: var(--surface); stroke-width: 2px; cursor: pointer; }
.dim { opacity: 0.15; }

.table-twin { margin-top: 12px; font-size: 13px; color: var(--ink-2); }
.table-twin summary { cursor: pointer; }
.table-twin table { margin-top: 8px; }
table { border-collapse: collapse; width: 100%; font-size: 13px; }
th { text-align: left; font-weight: 600; color: var(--ink-2); border-bottom: 1px solid var(--axis); padding: 6px 8px; }
td { border-bottom: 1px solid var(--grid); padding: 7px 8px; vertical-align: top; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
.table-scroll { overflow-x: auto; }
.papers .c-date { width: 96px; white-space: nowrap; font-variant-numeric: tabular-nums; }
.papers .c-code { width: 56px; }
.papers td:first-child { white-space: nowrap; color: var(--ink-2); font-variant-numeric: tabular-nums; }
.papers .title { color: var(--ink); font-weight: 500; }
.papers .topics { display: block; margin-top: 2px; font-size: 12px; color: var(--muted); }
.papers .c-authors { width: 32%; }
.papers td.authors { color: var(--ink-2); }
.more { margin-top: 12px; }

.head-row { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-start; gap: 12px; }
.seg { display: inline-flex; border: 1px solid var(--axis); border-radius: 8px; overflow: hidden; flex-shrink: 0; }
.seg button { border: 0; border-radius: 0; height: 32px; font-size: 13px; color: var(--ink-2); background: var(--surface); }
.seg button + button { border-left: 1px solid var(--axis); }
.seg button[aria-pressed="true"] { background: var(--wash); color: var(--ink); font-weight: 600; }
.rank .c-rank { width: 40px; color: var(--muted); }
.rank .c-bar { width: 22%; min-width: 120px; white-space: nowrap; }
.rank-bar { display: inline-block; height: 10px; border-radius: 0 4px 4px 0; background: var(--accent); vertical-align: middle; max-width: calc(100% - 44px); min-width: 2px; }
.rank-count { display: inline-block; margin-left: 8px; font-variant-numeric: tabular-nums; vertical-align: middle; }
.rank .c-recent { width: 88px; }
.rank .c-latest { width: 96px; white-space: nowrap; color: var(--ink-2); font-variant-numeric: tabular-nums; }
.rank td.c-topics, .rank td.c-co { color: var(--ink-2); }
.link { border: 0; background: none; height: auto; padding: 0; color: var(--ink); font-weight: 500; text-align: left; cursor: pointer; }
.link:hover { background: none; color: var(--accent); text-decoration: underline; }

.tooltip {
  position: fixed; z-index: 10; pointer-events: none; max-width: 340px;
  background: var(--surface); color: var(--ink); border-radius: 8px;
  box-shadow: 0 0 0 1px var(--ring), 0 6px 20px rgba(0, 0, 0, 0.14);
  padding: 8px 10px; font-size: 13px; line-height: 1.4;
}
.tooltip strong { display: block; font-size: 14px; }
.tooltip .sub { color: var(--ink-2); }
.tooltip .key { display: inline-block; width: 12px; height: 2px; background: var(--accent); vertical-align: middle; margin-right: 6px; }

.footer { color: var(--muted); font-size: 12px; padding-bottom: 40px; }
.empty { color: var(--muted); font-size: 13px; padding: 24px 0; text-align: center; }

@media (max-width: 860px) {
  .tiles { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .wrap { padding: 0 16px; }
  h1 { font-size: 24px; }
  .card { padding: 16px; }
  .field { min-width: calc(50% - 6px); flex: 1 1 calc(50% - 6px); }
  .jump .repo { margin-left: 0; }
  .papers .c-authors, .papers td.authors { display: none; }
  .rank .c-latest, .rank .c-topics, .rank .c-co { display: none; }
  .rank .c-bar { min-width: 90px; }
  .seg { width: 100%; }
  .seg button { flex: 1; }
  .topic-row, .topic-head { grid-template-columns: minmax(96px, 1fr) 1.4fr 44px; }
  .topic-row .spark, .topic-head span:nth-child(4) { display: none; }
  .map-frame { aspect-ratio: 1 / 1; }
}