:root {
  --bg: #f4efe6;
  --ink: #1c1914;
  --muted: #6a6258;
  --paper: #fffaf3;
  --line: #d9d0c2;
  --arts: #9b3d2f;
  --arts-soft: #c56a55;
  --sci: #1f5f73;
  --sci-soft: #3d8aa3;
  --gold: #c4a35a;
  --shadow: 0 18px 40px rgba(40, 28, 16, 0.08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, "Songti SC", serif;
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(196, 163, 90, 0.18), transparent 50%),
    radial-gradient(900px 400px at 100% 0%, rgba(31, 95, 115, 0.12), transparent 45%),
    var(--bg);
  line-height: 1.55;
}

.hero {
  max-width: 1120px;
  margin: 0 auto;
  padding: 56px 28px 24px;
}
.kicker {
  letter-spacing: 0.22em;
  text-transform: uppercase;
  font-size: 12px;
  color: var(--arts);
  margin: 0 0 10px;
  font-family: "Helvetica Neue", Arial, sans-serif;
}
h1 {
  font-size: clamp(28px, 4vw, 46px);
  font-weight: 600;
  margin: 0 0 16px;
  letter-spacing: 0.02em;
}
.lead {
  max-width: 46em;
  color: var(--muted);
  font-size: 17px;
  margin: 0 0 28px;
}
.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.toc a {
  color: var(--ink);
  text-decoration: none;
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 8px 12px;
  font-size: 13px;
  font-family: "Helvetica Neue", Arial, sans-serif;
}
.toc a:hover { border-color: var(--ink); }

.panel {
  max-width: 1120px;
  margin: 0 auto;
  padding: 28px 28px 12px;
}
.section-head h2 {
  font-size: 24px;
  margin: 0 0 8px;
}
.section-head p {
  color: var(--muted);
  margin: 0 0 20px;
  max-width: 58em;
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.card {
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  padding: 14px 14px 8px;
}
.card.wide { padding-bottom: 10px; }
.card header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 4px 8px 0;
}
.card h3 { margin: 0; font-size: 18px; }

.tag {
  font-family: "Helvetica Neue", Arial, sans-serif;
  font-size: 11px;
  letter-spacing: 0.08em;
  padding: 3px 8px;
  border: 1px solid currentColor;
}
.tag-arts { color: var(--arts); }
.tag-sci { color: var(--sci); }

.graph {
  width: 100%;
  height: 420px;
  display: block;
  user-select: none;
  overflow: visible;
}
.graph.tall { height: 460px; min-height: 360px; }
.caption {
  font-size: 12px;
  color: var(--muted);
  min-height: 1.6em;
  margin: 6px 8px 8px;
  font-family: "Helvetica Neue", Arial, sans-serif;
}

.note-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-top: 18px;
}
.note-grid h4 { margin: 0 0 8px; }
.note-grid ul { margin: 0; padding-left: 1.1em; color: var(--muted); }
.note-grid li { margin-bottom: 6px; }

.sub-controls, .plot-controls {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 14px;
  flex-wrap: wrap;
  font-family: "Helvetica Neue", Arial, sans-serif;
  font-size: 13px;
}
select {
  font: inherit;
  padding: 6px 10px;
  border: 1px solid var(--line);
  background: var(--paper);
}
.toggle { display: flex; gap: 8px; align-items: center; color: var(--muted); }
.insight {
  margin-top: 12px;
  padding: 14px 16px;
  background: rgba(255,250,243,0.7);
  border-left: 3px solid var(--gold);
  color: var(--muted);
}

.tabs { display: flex; flex-wrap: wrap; gap: 8px; flex: 1; }
.tabs button {
  font: inherit;
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 7px 11px;
  cursor: pointer;
  color: var(--ink);
}
.tabs button.active {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.plot-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(240px, 0.8fr);
  gap: 18px;
}
.plot-card { padding: 8px; }
#quad { width: 100%; height: 520px; display: block; overflow: visible; }

.legend-box {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 16px 18px;
  box-shadow: var(--shadow);
}
.legend-box h3 { margin: 0 0 4px; font-size: 18px; }
.muted { color: var(--muted); margin: 0 0 14px; font-size: 13px; }
.legend-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  margin-bottom: 6px;
  font-family: "Helvetica Neue", Arial, sans-serif;
}
.dot {
  width: 10px; height: 10px; border-radius: 50%; display: inline-block;
}
.dot.arts { background: var(--arts); }
.dot.sci { background: var(--sci); }
.hull-swatch {
  width: 16px; height: 10px; display: inline-block;
  border: 1.5px dashed currentColor; background: currentColor;
  opacity: 0.35;
}
.hull-swatch.arts { color: var(--arts); }
.hull-swatch.sci { color: var(--sci); }

.callout {
  margin: 14px 0;
  padding: 10px 12px;
  background: #f3ece0;
  font-size: 14px;
}
.hover-card {
  font-size: 13px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding-top: 12px;
}
.hover-card strong { color: var(--ink); display: block; margin-bottom: 4px; font-size: 15px; }
.hover-card.empty { font-style: italic; }

.metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-top: 16px;
}
.metric {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 12px 14px;
}
.metric b {
  display: block;
  font-size: 22px;
  font-family: "Helvetica Neue", Arial, sans-serif;
}
.metric span { font-size: 12px; color: var(--muted); }

.findings {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
}
.findings article {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 16px 18px;
  box-shadow: var(--shadow);
}
.findings h3 { margin: 0 0 8px; font-size: 16px; }
.findings p { margin: 0; color: var(--muted); font-size: 14px; }

.formula-box {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 12px 16px;
  margin: 0 0 16px;
  font-size: 13px;
  color: var(--muted);
  font-family: "Helvetica Neue", Arial, sans-serif;
}
.formula-box p { margin: 4px 0; }
.bar-list { padding: 8px 12px 14px; }
.bar-row {
  display: grid;
  grid-template-columns: 88px 1fr 40px;
  gap: 8px;
  align-items: center;
  font-size: 12px;
  font-family: "Helvetica Neue", Arial, sans-serif;
  margin: 6px 0;
}
.bar-row span:last-child { text-align: right; color: var(--muted); }
.bar-track { height: 8px; background: #efe6d6; }
.bar-fill { height: 8px; }
.table-wrap { overflow-x: auto; }
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
  font-family: "Helvetica Neue", Arial, sans-serif;
}
.data-table th, .data-table td {
  border-bottom: 1px solid var(--line);
  padding: 7px 8px;
  text-align: left;
  white-space: nowrap;
}
.data-table th { color: var(--muted); font-weight: 600; }
.data-table.compact td, .data-table.compact th { padding: 5px 6px; font-size: 11px; }
.data-table tr.arts-row td:first-child { color: var(--arts); }
.data-table tr.sci-row td:first-child { color: var(--sci); }
.score-panel {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 10px 14px 16px;
  margin-bottom: 16px;
}
.score-panel summary {
  cursor: pointer;
  font-family: "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  padding: 6px 0 10px;
}
.hover-card .ind-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px 12px;
  margin-top: 8px;
  font-size: 11px;
  font-family: "Helvetica Neue", Arial, sans-serif;
}

.footnote {
  margin-top: 22px;
  font-size: 12px;
  color: var(--muted);
  font-family: "Helvetica Neue", Arial, sans-serif;
}
footer {
  max-width: 1120px;
  margin: 28px auto 40px;
  padding: 0 28px;
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 12px;
  font-family: "Helvetica Neue", Arial, sans-serif;
}

.node-label { font-size: 11px; fill: var(--ink); pointer-events: none; }
.edge { fill: none; }
.quad-label { font-size: 11px; fill: #8a8174; font-family: "Helvetica Neue", Arial, sans-serif; }
.axis-title { font-size: 12px; fill: var(--ink); font-family: "Helvetica Neue", Arial, sans-serif; }

@media (max-width: 900px) {
  .split, .note-grid, .plot-layout, .findings, .metrics {
    grid-template-columns: 1fr;
  }
}