:root {
  color-scheme: light dark;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --link: #0066cc;
  --background: #ffffff;
  --rule: #d2d2d7;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --link: #4da3ff;
    --background: #000000;
    --rule: #424245;
  }
}

body {
  margin: 0 auto;
  max-width: 42rem;
  padding: 2.5rem 1.25rem 3rem;
  background: var(--background);
  color: var(--text);
  font: 1.0625rem/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}

h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 0.5rem; }
h2 { font-size: 1.25rem; margin: 2rem 0 0.5rem; }
h3 { font-size: 1.0625rem; margin: 1.5rem 0 0.25rem; }
p, ul { margin: 0 0 1rem; }
a { color: var(--link); }
.muted { color: var(--muted); }

footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.9375rem;
}

footer p { margin: 0.5rem 0 0; }