:root {
  --bg: #ffffff;
  --text: #1a1d21;
  --muted: #5c6670;
  --link: #0b63ce;
  --rule: #e3e7eb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0f14;
    --text: #e8ecf0;
    --muted: #9aa5b1;
    --link: #6cb2ff;
    --rule: #26303a;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 42rem; margin: 0 auto; padding: 2rem 1rem 4rem; }
h1 { font-size: 1.9rem; line-height: 1.2; margin: 0.5rem 0; }
h2 { font-size: 1.15rem; margin: 2rem 0 0.5rem; padding-top: 1rem; border-top: 1px solid var(--rule); }
a { color: var(--link); }
.meta, .back { color: var(--muted); font-size: 0.9rem; }
.back a { text-decoration: none; }
ul { padding-left: 1.25rem; }
li { margin: 0.25rem 0; }