:root {
  color-scheme: light dark;
  --fg: #1f2328;
  --muted: #59636e;
  --bg: #ffffff;
  --rule: #d1d9e0;
  --link: #0969da;
}
@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e6edf3;
    --muted: #9198a1;
    --bg: #0d1117;
    --rule: #3d444d;
    --link: #4493f8;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
main {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 20px 24px;
}
h1 { font-size: 2rem; line-height: 1.25; margin: 0 0 8px; }
h2 { font-size: 1.2rem; margin: 32px 0 8px; }
p, ul { margin: 0 0 12px; }
ul { padding-left: 1.4em; }
a { color: var(--link); }
.lead { font-size: 1.15rem; color: var(--muted); margin-bottom: 24px; }
.updated { color: var(--muted); font-size: 0.9rem; margin-bottom: 24px; }
footer {
  max-width: 720px;
  margin: 0 auto;
  padding: 16px 20px 48px;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.9rem;
}
footer nav a { margin-right: 16px; }