:root {
  --bg: #f7f7f5;
  --fg: #1f1f1d;
  --muted: #5f5f5a;
  --accent: #2f5d8a;
  --line: #deded8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1b1b1a;
    --fg: #e8e8e4;
    --muted: #a3a39c;
    --accent: #8db8e0;
    --line: #383836;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif;
}
main { max-width: 42rem; margin: 0 auto; padding: 3rem 1rem 4rem; }
h1 { font-size: 1.8rem; line-height: 1.25; margin: 0 0 .5rem; }
h2 { font-size: 1.2rem; margin: 2.2rem 0 .5rem; }
p, li { color: var(--fg); }
.lead { color: var(--muted); font-size: 1.1rem; margin-top: 0; }
a { color: var(--accent); }
nav { display: flex; gap: 1.2rem; margin-bottom: 2.5rem; font-size: .95rem; }
hr { border: 0; border-top: 1px solid var(--line); margin: 3rem 0 2rem; }
footer { color: var(--muted); font-size: .9rem; }
code { font-size: .92em; }