:root {
  --bg: #ffffff;
  --text: #1c1c1e;
  --muted: #6b6b70;
  --accent: #2f6fed;
  --line: #e4e4e8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1c1e;
    --text: #f2f2f5;
    --muted: #a0a0a8;
    --accent: #7aa7ff;
    --line: #38383c;
  }
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font:
    16px/1.6 -apple-system,
    BlinkMacSystemFont,
    'Segoe UI',
    Roboto,
    sans-serif;
}
main {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 16px 64px;
}
h1 {
  font-size: 1.8rem;
  margin: 0.5em 0 0.2em;
}
h2 {
  font-size: 1.2rem;
  margin: 1.8em 0 0.4em;
}
a {
  color: var(--accent);
}
.muted {
  color: var(--muted);
  font-size: 0.9rem;
}
nav {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}
section + section {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}