:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #5c5c5c;
  --rule: #e4e4e7;
  --link: #1d4ed8;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101014;
    --fg: #ececf1;
    --muted: #a1a1aa;
    --rule: #2a2a31;
    --link: #7aa2f7;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 3rem 1.25rem 5rem;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

main { max-width: 41rem; margin: 0 auto; }

h1 { font-size: 1.75rem; line-height: 1.25; margin: 0 0 1.5rem; }
h2 { font-size: 1.2rem; margin: 2.5rem 0 0.75rem; }
h3 { font-size: 1rem; margin: 1.75rem 0 0.5rem; color: var(--muted); }

p, li { margin: 0 0 1rem; }
ul { padding-left: 1.25rem; }

a { color: var(--link); }

nav {
  margin: 0 0 2.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--rule);
  font-size: 0.9rem;
  color: var(--muted);
}

footer {
  margin-top: 4rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  font-size: 0.85rem;
  color: var(--muted);
}