:root {
  --bg: #fbfaf7;
  --fg: #1f2328;
  --muted: #5b6168;
  --accent: #3b5bdb;
  --card: #ffffff;
  --border: #e4e2dc;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171a;
    --fg: #e8e6e3;
    --muted: #a3a8ae;
    --accent: #8ea4ff;
    --card: #1d2024;
    --border: #2e3237;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--fg);
  font:
    17px/1.6 system-ui,
    -apple-system,
    'Segoe UI',
    sans-serif;
}

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

.site-header,
.site-footer,
main {
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 16px;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  color: var(--fg);
  text-decoration: none;
}

nav {
  display: flex;
  gap: 20px;
}

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

nav a[aria-current='page'] {
  color: var(--fg);
  font-weight: 600;
}

main {
  flex: 1;
}

.hero {
  padding-block: 64px 40px;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  line-height: 1.15;
  margin: 0 0 16px;
}

.lead {
  max-width: 640px;
  color: var(--muted);
  font-size: 1.15rem;
}

.button {
  display: inline-block;
  margin-top: 12px;
  padding: 10px 20px;
  border-radius: 8px;
  background: var(--accent);
  color: var(--bg);
  font-weight: 600;
  text-decoration: none;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  padding-bottom: 64px;
}

.cards article {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card);
}

.cards h2 {
  margin-top: 0;
  font-size: 1.15rem;
}

.prose {
  max-width: 720px;
  padding-block: 40px 64px;
}

.not-found h1 {
  font-size: 4rem;
  margin-bottom: 0;
}

.site-footer {
  padding-block: 24px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}