:root {
  color-scheme: light dark;
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #1a1d21;
  --muted: #5c6570;
  --accent: #2563eb;
  --border: #e2e6eb;
  --max: 42rem;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1114;
    --surface: #171a1f;
    --text: #eef1f5;
    --muted: #9aa3ad;
    --accent: #60a5fa;
    --border: #2a3038;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.25rem;
}

header .wrap,
main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

header a.brand {
  color: var(--text);
  font-weight: 700;
  font-size: 1.125rem;
  text-decoration: none;
}

nav {
  margin-top: 0.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  font-size: 0.9375rem;
}

nav a {
  color: var(--accent);
  text-decoration: none;
}

nav a[aria-current="page"] {
  color: var(--text);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

main {
  padding-top: 2rem;
  padding-bottom: 3rem;
}

h1 {
  font-size: 1.75rem;
  line-height: 1.25;
  margin: 0 0 0.5rem;
}

.updated {
  color: var(--muted);
  font-size: 0.875rem;
  margin: 0 0 2rem;
}

h2 {
  font-size: 1.125rem;
  margin: 2rem 0 0.75rem;
}

p,
ul {
  margin: 0 0 1rem;
}

ul {
  padding-left: 1.25rem;
}

a {
  color: var(--accent);
}

footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 2.5rem;
  color: var(--muted);
  font-size: 0.875rem;
  border-top: 1px solid var(--border);
}

.card-grid {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1.25rem 1.5rem;
}

.card h2 {
  margin-top: 0;
  font-size: 1.125rem;
}

.card p {
  color: var(--muted);
  margin-bottom: 1rem;
}

.card a.button {
  display: inline-block;
  color: var(--surface);
  background: var(--accent);
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9375rem;
}

.intro {
  color: var(--muted);
  font-size: 1.0625rem;
}