:root {
  color-scheme: light dark;
  --fg: #1a1a1a;
  --muted: #666;
  --bg: #fafafa;
  --accent: #0b5fff;
}
@media (prefers-color-scheme: dark) {
  :root { --fg: #eaeaea; --muted: #a8a8a8; --bg: #161616; --accent: #6aa6ff; }
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.6;
}
main {
  max-width: 42rem;
  margin: 4rem auto;
  padding: 0 1.5rem;
}
header h1 { margin: 0 0 .25rem; font-size: 2rem; line-height: 1.2; }
header .subtitle { margin: 0; color: var(--muted); font-size: 1.1rem; }
nav { margin: 1.75rem 0 2.25rem; display: flex; gap: 1rem; flex-wrap: wrap; }
nav a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
nav a:hover, nav a[aria-current="page"] { border-bottom-color: var(--accent); }
article p { margin: 0 0 1rem; }
footer {
  margin-top: 4rem;
  padding-top: 1rem;
  border-top: 1px solid color-mix(in srgb, var(--muted) 30%, transparent);
  color: var(--muted);
  font-size: .85rem;
}