:root {
  --bg: #ffffff;
  --text: #1a1a1a;
  --muted: #666666;
  --link: #0b57d0;
  --rule: #e5e5e5;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --text: #eaeaea;
    --muted: #9a9a9a;
    --link: #8ab4f8;
    --rule: #2a2a2a;
  }
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
main {
  max-width: 640px;
  margin: 0 auto;
  padding: 64px 16px;
}
h1 { font-size: 2rem; margin: 0; }
h2 { font-size: 1.15rem; margin-top: 2.5rem; }
h3 { font-size: 1rem; margin-bottom: 0.25rem; }
.tagline { color: var(--muted); margin-top: 0.25rem; }
a { color: var(--link); }
footer {
  margin-top: 4rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 0.9rem;
}