:root {
  --bg: #fbfaf7;
  --fg: #1d1d1f;
  --muted: #6b6b70;
  --link: #1a5fb4;
  --rule: #e4e2dc;
  --code: #f0eee8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161618;
    --fg: #e8e6e1;
    --muted: #9a9aa0;
    --link: #78aeed;
    --rule: #2e2e32;
    --code: #232327;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0 auto;
  max-width: 44rem;
  padding: 2.5rem 16px 3rem;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
h1 { font-size: 2rem; line-height: 1.2; margin: 0.2em 0 0.4em; }
h2 { font-size: 1.25rem; margin: 2em 0 0.5em; }
h3 { font-size: 1rem; margin: 1.4em 0 0.3em; }
a { color: var(--link); }
code { background: var(--code); padding: 0.1em 0.35em; border-radius: 4px; font-size: 0.88em; word-break: break-all; }
.lead { font-size: 1.15rem; }
.muted, nav, footer { color: var(--muted); }
header { border-bottom: 1px solid var(--rule); padding-bottom: 1rem; }
footer { border-top: 1px solid var(--rule); margin-top: 3rem; padding-top: 1rem; font-size: 0.9rem; }
li { margin: 0.3em 0; }