:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #6b7280;
  --link: #2563eb;
  --border: #e5e7eb;
  --surface: #f9fafb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --fg: #e2e8f0;
    --muted: #94a3b8;
    --link: #60a5fa;
    --border: #334155;
    --surface: #1e293b;
  }
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  padding: 2rem 1rem;
}
main {
  max-width: 40rem;
  margin: 0 auto;
}
h1 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}
.subtitle {
  color: var(--muted);
  font-size: 0.875rem;
  margin-bottom: 2rem;
}
h2 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
}
p {
  margin-bottom: 1rem;
}
ul {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}
li {
  margin-bottom: 0.25rem;
}
a {
  color: var(--link);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 1rem 1.25rem;
  margin-top: 1rem;
}
.d {
  display: none;
}
code {
  font-size: 0.875rem;
}
footer {
  margin-top: 3rem;
  color: var(--muted);
  font-size: 0.75rem;
}