:root {
  --bg: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --rule: #d2d2d7;
  --link: #0066cc;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111113;
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --rule: #3a3a3c;
    --link: #4da3ff;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
main {
  max-width: 680px;
  margin: 0 auto;
  padding: 48px 16px 64px;
}
header { margin-bottom: 32px; }
.brand {
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
}
h1 { font-size: 34px; line-height: 1.15; margin: 8px 0 4px; }
h2 { font-size: 19px; margin: 28px 0 4px; }
p { margin: 0 0 12px; }
.meta { color: var(--muted); margin-bottom: 24px; }
a { color: var(--link); }
footer {
  margin-top: 48px;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 15px;
}
footer a { margin-right: 16px; }