:root {
  --bg: #fbfaf8;
  --text: #1d1d1b;
  --muted: #5d5b57;
  --rule: #e2dfd9;
  --link: #1f5fbf;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161615;
    --text: #ecebe8;
    --muted: #a8a59f;
    --rule: #34332f;
    --link: #8db6f5;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
main { max-width: 680px; margin: 0 auto; padding: 48px 16px 64px; }
h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 4px; }
h2 { font-size: 1.15rem; margin: 32px 0 8px; }
.sub { color: var(--muted); margin: 0 0 24px; }
a { color: var(--link); }
ul { padding-left: 1.2em; }
li { margin: 4px 0; }
code { font-size: 0.9em; }
footer { border-top: 1px solid var(--rule); margin-top: 40px; padding-top: 16px; color: var(--muted); font-size: 0.9rem; }