:root {
  color-scheme: dark;
  --bg: #09090b;
  --surface: #141418;
  --text: #f4f4f6;
  --muted: #a1a1aa;
  --accent: #f97316;
  --border: #27272a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 20px 80px;
}

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

h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 1.25rem; margin: 40px 0 8px; }
h3 { font-size: 1.05rem; margin: 24px 0 4px; }

.brand {
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.18em;
  font-size: 0.8rem;
  text-transform: uppercase;
}

.muted { color: var(--muted); }

nav.lang {
  display: flex;
  gap: 12px;
  margin: 16px 0 32px;
}

nav.lang a {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 14px;
  text-decoration: none;
}

section.doc {
  border-top: 1px solid var(--border);
  padding-top: 8px;
  margin-top: 40px;
}

ul { padding-left: 20px; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px 20px;
  margin: 12px 0;
}

footer {
  margin-top: 64px;
  color: var(--muted);
  font-size: 0.85rem;
}