:root {
  --bg: #f6f6f8;
  --text: #1c1c1e;
  --muted: #6b6b72;
  --link: #c8323c;
  --rule: #e2e2e6;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #111113; --text: #f2f2f5; --muted: #9a9aa2; --link: #ff6b73; --rule: #2a2a2e; }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}
main { max-width: 720px; margin: 0 auto; padding: 40px 20px 80px; }
h1 { font-size: 36px; line-height: 1.15; letter-spacing: -0.02em; margin: 8px 0 4px; }
h2 { font-size: 21px; margin: 36px 0 8px; padding-top: 20px; border-top: 1px solid var(--rule); }
h3 { font-size: 17px; margin: 22px 0 4px; }
p, li { color: var(--text); }
ul { padding-left: 22px; }
li { margin: 6px 0; }
a { color: var(--link); }
.meta, .crumbs { color: var(--muted); font-size: 14px; }
.crumbs a { color: var(--muted); }
.lead { font-size: 19px; }