:root {
  --bg: #0f1420;
  --card: #171e2e;
  --text: #e8ecf5;
  --muted: #9aa6bf;
  --accent: #5b8cff;
  --line: #262f45;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5f7fb;
    --card: #ffffff;
    --text: #172033;
    --muted: #5a6680;
    --accent: #2f5fe0;
    --line: #dfe4ef;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 20px;
}

header.top {
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

header.top .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.brand {
  font-weight: 700;
  font-size: 19px;
  letter-spacing: 0.2px;
  color: var(--text);
  text-decoration: none;
}

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

nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 15px;
}

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

.hero { padding: 72px 0 56px; }

.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(30px, 6vw, 46px);
  line-height: 1.15;
}

.hero p {
  margin: 0;
  max-width: 620px;
  color: var(--muted);
  font-size: 19px;
}

section { padding: 40px 0; }

section h2 {
  margin: 0 0 20px;
  font-size: 26px;
}

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

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px;
}

.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 16px; }

.empty {
  border-style: dashed;
  text-align: center;
  color: var(--muted);
}

dl.details {
  margin: 0;
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 10px 24px;
}

dl.details dt { color: var(--muted); }
dl.details dd { margin: 0; overflow-wrap: anywhere; }

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

footer {
  margin-top: 40px;
  padding: 28px 0 40px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

footer .wrap {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

footer a { color: var(--muted); }

.doc h1 { font-size: 34px; margin: 48px 0 8px; }
.doc h2 { font-size: 22px; margin: 32px 0 10px; }
.doc p, .doc li { color: var(--text); }
.doc .updated { color: var(--muted); margin-bottom: 28px; }

@media (max-width: 560px) {
  body { font-size: 16px; }
  .hero { padding: 48px 0 32px; }
  dl.details { grid-template-columns: 1fr; gap: 2px 0; }
  dl.details dd { margin-bottom: 12px; }
}