:root {
  --bg: #f7f7f5;
  --text: #1d1f21;
  --muted: #5b6066;
  --rule: #dcdcd7;
  --link: #1a5c8c;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17191b;
    --text: #e6e6e3;
    --muted: #a3a8ad;
    --rule: #33373a;
    --link: #7ab6e0;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 42rem; margin: 0 auto; padding: 3rem 1rem 4rem; }
header { border-bottom: 1px solid var(--rule); margin-bottom: 2rem; padding-bottom: 1rem; }
header p { margin: 0; color: var(--muted); font-size: 0.95rem; }
h1 { font-size: 1.9rem; line-height: 1.25; margin: 0.25rem 0 0.5rem; }
h2 { font-size: 1.2rem; margin: 2.2rem 0 0.4rem; }
ul { padding-left: 1.3rem; }
li { margin: 0.25rem 0; }
a { color: var(--link); }
footer { border-top: 1px solid var(--rule); margin-top: 3rem; padding-top: 1rem; color: var(--muted); font-size: 0.9rem; }
footer a { margin-right: 1rem; }