:root {
  color-scheme: light dark;
  --bg: #f7f8fb;
  --text: #172033;
  --muted: #5c667a;
  --card: #ffffff;
  --border: #d9deea;
  --accent: #2563eb;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1420;
    --text: #eef3ff;
    --muted: #aab4c8;
    --card: #171d2b;
    --border: #30384c;
    --accent: #74a3ff;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

.shell {
  width: min(960px, calc(100% - 32px));
  margin: 0 auto;
  padding: 40px 0 56px;
}

header {
  padding: 28px 0 22px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 14px;
}

h1 {
  margin: 0;
  font-size: clamp(34px, 7vw, 64px);
  line-height: 1.05;
  letter-spacing: 0;
}

h2 {
  margin: 36px 0 12px;
  font-size: 28px;
}

h3 {
  margin: 24px 0 8px;
  font-size: 20px;
}

p,
li {
  color: var(--muted);
}

.nav,
.lang {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 24px 0;
}

.nav a,
.lang a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
  text-decoration: none;
  font-weight: 600;
}

.card {
  margin: 18px 0;
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

.doc {
  scroll-margin-top: 24px;
}

.updated {
  color: var(--muted);
  font-size: 14px;
}

footer {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
}