:root {
  --bg: #fafafa;
  --fg: #1d1d1f;
  --muted: #5f6368;
  --accent: #c4302b;
  --border: #e0e0e0;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161618;
    --fg: #ececec;
    --muted: #a0a0a8;
    --accent: #ff6b63;
    --border: #2e2e33;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 42rem; margin: 0 auto; padding: 3rem 1rem 4rem; }
h1 { font-size: 2rem; margin: 0 0 .25rem; }
h2 { font-size: 1.2rem; margin: 2rem 0 .5rem; }
.lead { color: var(--muted); font-size: 1.1rem; margin-top: 0; }
a { color: var(--accent); }
ul { padding-left: 1.25rem; }
footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: .9rem;
}
footer a { color: inherit; }