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

@media (prefers-color-scheme: dark) {
  :root {
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --background: #000000;
    --link: #2997ff;
    --rule: #424245;
  }
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font: 17px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 48px 16px 64px;
}

h1 {
  font-size: 34px;
  line-height: 1.2;
  margin: 0 0 8px;
}

h2 {
  font-size: 21px;
  margin: 32px 0 8px;
}

p, ul {
  margin: 0 0 16px;
}

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

.muted {
  color: var(--muted);
}

footer {
  margin-top: 48px;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 15px;
}