:root {
  color-scheme: light dark;
  --bg: #fbfbfe;
  --text: #1b1b1f;
  --muted: #5d5e67;
  --accent: #2f5be7;
  --card: #f1f1f9;
  --rule: #e2e2ec;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121318;
    --text: #e4e4ec;
    --muted: #a9aab5;
    --accent: #aec3ff;
    --card: #1c1d24;
    --rule: #2d2e37;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 42rem; margin: 0 auto; padding: 3rem 1rem 4rem; }
header { margin-bottom: 2.5rem; }
.brand { font-size: 1.1rem; font-weight: 600; color: var(--text); text-decoration: none; letter-spacing: 0.01em; }
h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 0.75rem; }
h2 { font-size: 1.15rem; margin: 2rem 0 0.5rem; }
p, li { color: var(--text); }
.lede { color: var(--muted); font-size: 1.1rem; margin-top: 0; }
.muted { color: var(--muted); }
a { color: var(--accent); }
.card { background: var(--card); border-radius: 16px; padding: 1.25rem 1.25rem 1rem; margin: 1.5rem 0; }
.card h2 { margin-top: 0; }
footer { margin-top: 3rem; padding-top: 1.25rem; border-top: 1px solid var(--rule); color: var(--muted); font-size: 0.95rem; }