:root {
  color-scheme: light dark;
  --bg: hsl(0 0% 98%);
  --fg: hsl(215 20% 20%);
  --muted: hsl(215 20% 32%);
  --border: hsl(0 0% 87.4%);
  --card: hsl(0 0% 100%);
  --link: hsl(213.5 100% 40.2%);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: hsl(0 0% 0%);
    --fg: hsl(0 0% 92.9%);
    --muted: hsl(240 6% 74%);
    --border: hsl(0 0% 18%);
    --card: hsl(0 0% 6%);
    --link: hsl(212.4 100% 74.9%);
  }
}
*, *::before, *::after { box-sizing: border-box; }
body {
  margin: 0;
  font: 14px/1.6 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
}
header {
  max-width: 720px;
  margin: 0 auto;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  font-weight: 600;
  color: var(--fg);
  text-decoration: none;
  letter-spacing: -0.02em;
}
main {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 24px 64px;
}
h1 {
  font-size: 24px;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
}
h2 {
  font-size: 16px;
  letter-spacing: -0.01em;
  margin: 28px 0 8px;
}
p, dl, ul {
  margin: 0 0 14px;
  color: var(--muted);
}
dt {
  font-weight: 600;
  color: var(--fg);
  margin-top: 8px;
}
dd {
  margin: 2px 0 0;
}
a {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 3px;
}
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
  padding: 1px 4px;
  border-radius: 3px;
  border: 1px solid var(--border);
}
footer {
  max-width: 720px;
  margin: 0 auto;
  padding: 20px 24px 40px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--muted);
}