:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #666666;
  --border: #dddddd;
  --accent: #cc3333;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #1a1a1a; --fg: #eeeeee; --muted: #aaaaaa; --border: #444444; }
}
* { box-sizing: border-box; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  margin: 0;
  padding: 1.5rem;
}
h1 { font-size: 1.25rem; margin: 0 0 0.25rem; }
p.sub { color: var(--muted); margin: 0 0 1.5rem; font-size: 0.9rem; }
.controls { display: flex; flex-wrap: wrap; gap: 1.5rem; margin-bottom: 1rem; }
.controls label { display: block; font-size: 0.85rem; color: var(--muted); margin-bottom: 0.25rem; }
select { font-size: 0.95rem; padding: 0.25rem; }
.legs { display: flex; flex-wrap: wrap; gap: 0.5rem; max-width: 40rem; }
.legs label { display: inline-flex; align-items: center; gap: 0.35rem; font-size: 0.85rem; color: var(--fg); }
.legs-toolbar { display: flex; gap: 0.4rem; margin: 0.25rem 0 0.4rem; }
.legs-toolbar button {
  font-size: 0.75rem;
  padding: 0.1rem 0.5rem;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
}
.legs-toolbar button:hover { border-color: var(--accent); }
.chart-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: 6px; padding: 0.5rem; }
canvas { display: block; }
.legend { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 0.75rem; font-size: 0.8rem; }
.legend-item { display: flex; align-items: center; gap: 0.35rem; }
.swatch { width: 0.75rem; height: 0.75rem; border-radius: 2px; display: inline-block; }
.note { color: var(--muted); font-size: 0.8rem; margin-top: 1rem; }
.empty { color: var(--muted); padding: 2rem 0; text-align: center; }
.crosslink { margin-top: 2rem; padding-top: 1rem; border-top: 1px solid var(--border); font-size: 0.85rem; }