:root {
  color-scheme: light dark;
  --text: #1f2328;
  --muted: #59636e;
  --bg: #ffffff;
  --link: #0b57d0;
  --rule: #d8dee4;
}
@media (prefers-color-scheme: dark) {
  :root {
    --text: #e6edf3;
    --muted: #9198a1;
    --bg: #0d1117;
    --link: #7aa7ff;
    --rule: #30363d;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
main { max-width: 680px; margin: 0 auto; padding: 48px 20px 64px; }
h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 1.15rem; margin: 32px 0 8px; }
p, ul { margin: 0 0 14px; }
li { margin-bottom: 6px; }
a { color: var(--link); }
code { font-size: 0.85em; word-break: break-all; }
.lead { font-size: 1.15rem; color: var(--muted); }
.meta { color: var(--muted); font-size: 0.95rem; }
nav, footer { margin-top: 40px; padding-top: 16px; border-top: 1px solid var(--rule); color: var(--muted); }