:root {
  --bg: #fbfaf7;
  --fg: #16181d;
  --muted: #5b616e;
  --accent: #1f4fd8;
  --rule: #e4e1d8;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --fg: #eceef2;
    --muted: #9aa1ae;
    --accent: #7ea2ff;
    --rule: #262a33;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif;
}

main {
  max-width: 40rem;
  margin: 0 auto;
  padding: 3rem 1rem 4rem;
}

h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 0.5rem; }
h2 { font-size: 1.15rem; margin: 2rem 0 0.5rem; }
p, li { margin: 0 0 0.75rem; }
a { color: var(--accent); }
.muted { color: var(--muted); }

footer {
  max-width: 40rem;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.9rem;
}

footer a { margin-right: 1rem; }