:root {
  color-scheme: light dark;
  --bg: #f3f4f6;
  --ink: #101318;
  --muted: #535a65;
  --line: rgba(16, 19, 24, 0.12);
  --card: #fff;
  --accent: #607419;
  --max: 42rem;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0c0f;
    --ink: #f2f4f7;
    --muted: #a3a8b1;
    --line: rgba(255, 255, 255, 0.14);
    --card: #15171c;
    --accent: #c8f135;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
header, main, footer { max-width: var(--max); margin: 0 auto; padding: 0 20px; }
header { padding-top: 28px; }
nav { display: flex; flex-wrap: wrap; gap: 12px 18px; margin: 18px 0 8px; }
a { color: var(--accent); }
h1 { font-size: 2rem; line-height: 1.2; letter-spacing: -0.03em; margin: 0 0 8px; }
h2 { font-size: 1.15rem; margin: 1.6rem 0 0.4rem; }
p, li { color: var(--ink); }
.muted, footer, .note { color: var(--muted); }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px 18px;
  margin: 16px 0;
}
footer { padding: 28px 20px 48px; font-size: 0.9rem; }
ul { padding-left: 1.2rem; }
code { font-size: 0.95em; }