:root {
  --ink: #1b2430;
  --muted: #5b6573;
  --line: #e4e8ee;
  --bg: #f7f8fa;
  --card: #ffffff;
  --accent: #1f4e79;
  --accent-soft: #e8f0f7;
  --gold: #c9a227;
  --max: 1080px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: "Source Sans 3", "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.55;
}

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

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

header.hero {
  background: var(--card);
  border-bottom: 1px solid var(--line);
  padding: 48px 0 36px;
  text-align: center;
}

.logo {
  margin: 0 0 8px;
  text-align: center;
}
.logo h1 {
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 52px;
  letter-spacing: 0.04em;
  margin: 0;
  color: var(--accent);
}

.subtitle {
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 22px;
  font-weight: 500;
  margin: 0 0 18px;
}

.authors { margin: 0 0 6px; }
.authors a { color: var(--ink); }
.affil, .venue { color: var(--muted); font-size: 15px; margin: 2px 0; }
.venue { margin-top: 8px; font-weight: 600; color: var(--accent); }

.links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 22px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--card);
  color: var(--ink);
  font-weight: 600;
  font-size: 14px;
}
.btn:hover { background: var(--accent-soft); text-decoration: none; border-color: #c5d4e4; }

nav.toc {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(247, 248, 250, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
nav.toc .wrap {
  display: flex;
  justify-content: center;
  gap: 18px;
  overflow-x: auto;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
}
nav.toc a { color: var(--muted); white-space: nowrap; }
nav.toc a:hover { color: var(--accent); }

section { padding: 40px 0 8px; scroll-margin-top: 52px; }
h2 {
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 28px;
  margin: 0 0 14px;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
  padding-bottom: 4px;
}
p.lead { margin: 0 0 12px; }

.figure {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px;
  margin: 18px 0 8px;
}
.figure img { width: 100%; height: auto; display: block; }
.caption {
  font-size: 14px;
  color: var(--muted);
  text-align: center;
  margin: 8px 0 0;
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin: 18px 0 8px;
}
.stat {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 12px;
  text-align: center;
}
.stat b { display: block; font-size: 24px; color: var(--accent); }
.stat span { font-size: 13px; color: var(--muted); }

.families {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 16px 0 8px;
}
.family {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 16px;
}
.family h3 { margin: 0 0 6px; font-size: 16px; }
.family p { margin: 0; font-size: 14px; color: var(--muted); }
.tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  background: var(--accent-soft);
  color: var(--accent);
  padding: 2px 7px;
  border-radius: 999px;
  margin-bottom: 8px;
}

.tabs { display: flex; gap: 6px; margin: 12px 0; }
.tab {
  border: 1px solid var(--line);
  background: var(--card);
  padding: 8px 14px;
  border-radius: 8px;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  font-size: 14px;
}
.tab.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.table-wrap {
  overflow-x: auto;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
}
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 9px 10px; text-align: left; border-bottom: 1px solid var(--line); white-space: nowrap; }
th { background: #eef3f8; font-size: 12px; letter-spacing: 0.03em; text-transform: uppercase; color: var(--muted); }
td.num, th.num { text-align: right; }
tr.best td { font-weight: 700; }
.note { font-size: 13px; color: var(--muted); margin-top: 10px; }

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

pre {
  background: #1b2430;
  color: #e8eef5;
  padding: 16px 18px;
  border-radius: 10px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.45;
}
.copy {
  margin-top: 8px;
  font-size: 13px;
  border: 1px solid var(--line);
  background: var(--card);
  padding: 6px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-family: inherit;
}

footer {
  margin-top: 48px;
  padding: 28px 0 40px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

@media (max-width: 800px) {
  .logo h1 { font-size: 36px; }
  .subtitle { font-size: 18px; }
  .stats, .families, .grid-2 { grid-template-columns: 1fr; }
}