/* ============================================================
   ChartAnno project page — minimal academic style
   Palette from the paper: chartblue #2466A0 (accents/links),
   annogreen #238C6E (secondary accent).
   ============================================================ */

:root {
  --ink: #1f2937;
  --ink-soft: #4b5563;
  --ink-mute: #6b7280;
  --line: #e5e7eb;
  --line-soft: #f0f2f5;
  --bg: #ffffff;
  --bg-soft: #f7f9fb;
  --blue: #2466a0;
  --blue-deep: #1b4c78;
  --green: #238c6e;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.page {
  width: min(1200px, calc(100% - 40px));
  margin: 0 auto;
  padding: 64px 0 48px;
}

img { max-width: 100%; display: block; }

a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--blue-deep); text-decoration: underline; }

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

/* ---------------- Title block ---------------- */
.title-block { text-align: center; }

.paper-title {
  margin: 0;
  font-size: clamp(32px, 5vw, 44px);
  font-weight: 750;
  letter-spacing: -0.02em;
  line-height: 1.22;
  color: #111827;
}

.authors {
  margin: 28px 0 0;
  font-size: 17px;
  line-height: 2.05;
  color: var(--ink-soft);
}
.authors .author-row {
  display: block;
  text-align: center;
}
.authors .author-row > span { margin: 0 0.55em; white-space: nowrap; }
.authors sup { font-size: 11.5px; color: var(--ink-mute); }
.authors sup.eq { color: var(--green); font-weight: 700; }

.affiliations {
  margin: 12px 0 0;
  font-size: 16.5px;
  color: var(--ink-mute);
}
.affiliations sup { font-size: 11.5px; }
.affiliations.note { margin-top: 5px; font-size: 15px; }

.link-row {
  margin-top: 26px;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
}
.pill {
  display: inline-block;
  padding: 8px 22px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink-soft);
  letter-spacing: 0.02em;
  transition: none;
}
.pill:hover {
  color: var(--blue);
  border-color: var(--blue);
  text-decoration: none;
}
.pill.ghost {
  color: #b3bcc6;
  border-color: var(--line-soft);
  cursor: default;
}
.fig figcaption b { color: var(--ink-soft); }

/* ---------------- Figures ---------------- */
.fig {
  margin: 52px 0 0;
  text-align: center;
}
.fig img {
  width: 100%;
  border: 1px solid var(--line-soft);
  border-radius: 6px;
  margin: 0 auto;
}
.fig figcaption {
  margin-top: 14px;
  font-size: 15.5px;
  line-height: 1.65;
  color: var(--ink-mute);
  text-align: center;
}
.fig figcaption em { font-style: italic; }

/* ---------------- Sections ---------------- */
.sec { margin-top: 64px; }

.sec h2 {
  margin: 0 0 20px;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--blue);
  text-align: center;
}

.sec p { margin: 0 0 14px; font-size: 18px; color: var(--ink-soft); }
.sec p:last-child { margin-bottom: 0; }
.sec p b { color: var(--ink); }
.sec .sec-note { font-size: 16px; color: var(--ink-mute); }

/* ---------------- Tabs ---------------- */
.tabs {
  display: flex;
  gap: 6px;
  margin: 20px 0 18px;
  border-bottom: 1px solid var(--line);
}
.tab {
  appearance: none;
  border: none;
  background: transparent;
  font: inherit;
  font-size: 16.5px;
  font-weight: 600;
  color: var(--ink-mute);
  padding: 10px 18px;
  cursor: pointer;
  border-bottom: 2.5px solid transparent;
  margin-bottom: -1px;
}
.tab:hover { color: var(--ink); }
.tab.active {
  color: var(--blue);
  border-bottom-color: var(--blue);
}

/* Model-group filter buttons, right-aligned inside the tab row */
.filters {
  margin-left: auto;
  display: inline-flex;
  gap: 6px;
  align-self: center;
  padding-bottom: 9px;
}
.fbtn {
  appearance: none;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  font: inherit;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink-mute);
  padding: 4px 14px;
  cursor: pointer;
}
.fbtn:hover { color: var(--blue); border-color: var(--blue); }
.fbtn.active {
  color: #fff;
  background: var(--blue);
  border-color: var(--blue);
}

/* ---------------- Leaderboard table ---------------- */
.board-scroll { overflow-x: auto; }

.board {
  width: 100%;
  min-width: 900px;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
  font-size: 15px;
}

.board thead th {
  padding: 9px 12px;
  font-weight: 700;
  color: var(--ink-soft);
  white-space: nowrap;
  border-bottom: 1.5px solid #d4d9e0;
}

/* Sortable headers: click desc -> asc -> default */
.board thead th.sortable { cursor: pointer; user-select: none; }
.board thead th.sortable:hover { color: var(--blue); }
.board thead th.sortable::after {
  content: "⇅";
  font-size: 10px;
  color: #c3cad3;
  margin-left: 4px;
}
.board thead th.sortable[data-dir="desc"]::after {
  content: "↓";
  color: var(--blue);
}
.board thead th.sortable[data-dir="asc"]::after {
  content: "↑";
  color: var(--blue);
}
.board thead th.sortable[data-dir] { color: var(--blue); }
.board .head-group th {
  padding-top: 4px;
  padding-bottom: 4px;
  font-size: 14.5px;
  letter-spacing: 0.02em;
}
.board .head-metrics th {
  font-size: 13.5px;
  font-weight: 650;
  color: var(--ink-mute);
}
.board .th-model { text-align: left; }
.board thead .grp { text-align: center; }
.board .grp-a { border-left: 1px solid var(--line); background: rgba(36, 102, 160, 0.045); }
.board .grp-b { border-left: 1px solid var(--line); background: rgba(31, 167, 201, 0.05); }
.board .grp-c { border-left: 1px solid var(--line); background: rgba(35, 140, 110, 0.05); }

.board tbody td {
  padding: 9px 12px;
  text-align: right;
  color: var(--ink-soft);
  white-space: nowrap;
  border-bottom: 1px solid var(--line-soft);
}
.board tbody td.td-model {
  text-align: left;
  font-weight: 600;
  color: var(--ink);
  font-size: 15px;
}
.board tbody td.grp-a,
.board tbody td.grp-b,
.board tbody td.grp-c { border-left: 1px solid var(--line); }

.board tbody td.best {
  font-weight: 750;
  color: #111827;
}

.foot-note {
  margin-top: 14px;
  font-size: 15px;
  color: var(--ink-mute);
}

/* Mini heatmap legend: 6 steps matching the cell shading */
.heat-legend {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-left: 14px;
  vertical-align: middle;
  font-size: 12.5px;
  color: var(--ink-mute);
}
.heat-legend i {
  width: 16px;
  height: 11px;
  border-radius: 2px;
  display: inline-block;
}
.heat-legend i:nth-of-type(1) { background: rgba(35, 140, 110, 0.05); }
.heat-legend i:nth-of-type(2) { background: rgba(35, 140, 110, 0.11); }
.heat-legend i:nth-of-type(3) { background: rgba(35, 140, 110, 0.17); }
.heat-legend i:nth-of-type(4) { background: rgba(35, 140, 110, 0.23); }
.heat-legend i:nth-of-type(5) { background: rgba(35, 140, 110, 0.28); }
.heat-legend i:nth-of-type(6) { background: rgba(35, 140, 110, 0.32); }
.foot-note .fn,
.head-metrics .fn { color: var(--blue); font-weight: 700; }

/* ---------------- Citation ---------------- */
.bibtex {
  position: relative;
  background: var(--bg-soft);
  border: 1px solid var(--line-soft);
  border-radius: 8px;
}
.bibtex pre { margin: 0; padding: 20px 22px; overflow-x: auto; }
.bibtex code {
  font-family: var(--font-mono);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink-soft);
}
.copy-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  appearance: none;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 6px;
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-mute);
  padding: 5px 14px;
  cursor: pointer;
}
.copy-btn:hover { color: var(--blue); border-color: var(--blue); }

/* ---------------- Footer ---------------- */
.foot {
  margin-top: 80px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  text-align: center;
}
.foot p { margin: 0; font-size: 15px; color: var(--ink-mute); }
.foot .credits { margin-top: 6px; font-size: 13.5px; color: #9aa3af; }
.foot .brand { display: flex; flex-direction: column; align-items: center; gap: 10px; margin: 0 0 14px; }
.foot .brand img { height: 52px; width: auto; }
.foot .brand img + img { height: 20px; }

/* ---------------- Responsive ---------------- */
@media (max-width: 640px) {
  .page { width: calc(100% - 28px); padding-top: 44px; }
  .sec { margin-top: 52px; }
  .authors { font-size: 14.5px; }
}