:root {
  --bg: #fdfdfc;
  --fg: #1a1a18;
  --muted: #5c5c56;
  --rule: #e2e2dc;
  --link: #3a5a8c;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16161a;
    --fg: #e8e8e4;
    --muted: #9a9a92;
    --rule: #2e2e34;
    --link: #8fb0e0;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  padding: 3rem 1.25rem 5rem;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}
main { max-width: 42rem; margin: 0 auto; }
h1 { font-size: 1.6rem; line-height: 1.25; margin: 0 0 0.35em; letter-spacing: -0.01em; }
h2 { font-size: 1.05rem; margin: 2.2em 0 0.6em; letter-spacing: -0.005em; }
p, li { color: var(--fg); }
ul { padding-left: 1.2rem; }
li { margin: 0.4em 0; }
a { color: var(--link); }
.sub { color: var(--muted); font-size: 0.92rem; margin-top: 0; }
hr { border: 0; border-top: 1px solid var(--rule); margin: 2.5rem 0; }
footer { color: var(--muted); font-size: 0.88rem; }
code { font-size: 0.92em; }