:root {
  --bg: #ffffff;
  --fg: #1c2033;
  --muted: #5b6078;
  --line: #e2e4ee;
  --accent: #4f46e5;
  --callout: #f3f4fb;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1437;
    --fg: #e8eaf6;
    --muted: #a3a8c9;
    --line: #2a3060;
    --accent: #a5b4fc;
    --callout: #171d48;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
h1 { font-size: 2rem; line-height: 1.2; margin: 24px 0 4px; }
h2 { font-size: 1.25rem; margin: 40px 0 8px; padding-top: 16px; border-top: 1px solid var(--line); }
h3 { font-size: 1rem; margin: 24px 0 4px; }
a { color: var(--accent); }
ul { padding-left: 1.25rem; }
li { margin: 4px 0; }
.meta, .back { color: var(--muted); font-size: 0.9rem; }
.summary { background: var(--callout); border-radius: 12px; padding: 16px; }
table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
th, td { text-align: left; padding: 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
mark { background: #fde047; color: #1c2033; padding: 0 3px; border-radius: 3px; }