:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #111111;
  --muted: #555555;
  --accent: #0066cc;
  --rule: #e5e5e5;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0c0c;
    --fg: #eaeaea;
    --muted: #9a9a9a;
    --accent: #4ea1ff;
    --rule: #222222;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  padding: 0 1.25rem 4rem;
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", system-ui, sans-serif;
  color: var(--fg);
  background: var(--bg);
}
header, main, footer { max-width: 720px; margin: 0 auto; }
header { padding: 3rem 0 1.5rem; border-bottom: 1px solid var(--rule); }
h1 { font-size: 2rem; margin: 0 0 .25rem; letter-spacing: -.01em; }
h2 { font-size: 1.2rem; margin: 2rem 0 .5rem; }
h3 { font-size: 1rem; margin: 1.5rem 0 .25rem; }
.tagline { color: var(--muted); margin: 0; }
main { padding-top: 1.5rem; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
ul { padding-left: 1.25rem; }
li { margin: .25rem 0; }
.links { margin-top: 2rem; display: flex; gap: 1.25rem; flex-wrap: wrap; }
footer { margin-top: 3rem; padding-top: 1rem; border-top: 1px solid var(--rule); color: var(--muted); font-size: .85rem; }