:root {
  color-scheme: light dark;
  --background: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --accent: #0a66c2;
  --rule: #d2d2d7;
}
@media (prefers-color-scheme: dark) {
  :root {
    --background: #000000;
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --accent: #4da3ff;
    --rule: #38383a;
  }
}
body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
nav { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 24px; }
a { color: var(--accent); }
h1 { font-size: 28px; line-height: 1.2; margin: 0 0 4px; }
h2 { font-size: 18px; margin: 28px 0 8px; }
section + section { border-top: 1px solid var(--rule); margin-top: 48px; padding-top: 32px; }
.effective { color: var(--muted); margin: 0 0 16px; }
code { font-size: 14px; overflow-wrap: anywhere; }