:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #5a6172;
  --accent: #2c5282;
  --border: #e2e8f0;
  --card: #f7fafc;
  --max: 760px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

header.site {
  border-bottom: 1px solid var(--border);
  padding: 18px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

header.site .brand {
  font-weight: 700;
  font-size: 18px;
  color: var(--fg);
  text-decoration: none;
  letter-spacing: 0.2px;
}

header.site nav a {
  margin-left: 18px;
  color: var(--muted);
  text-decoration: none;
  font-size: 15px;
}

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

main {
  max-width: var(--max);
  margin: 40px auto;
  padding: 0 24px;
}

h1 {
  font-size: 30px;
  margin: 0 0 12px;
  line-height: 1.25;
}

h2 {
  font-size: 22px;
  margin: 32px 0 10px;
  line-height: 1.3;
}

h3 {
  font-size: 18px;
  margin: 24px 0 8px;
}

p { margin: 12px 0; }

ul { padding-left: 22px; margin: 12px 0; }

li { margin: 6px 0; }

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

.lead {
  color: var(--muted);
  font-size: 18px;
  margin-bottom: 24px;
}

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

.card dl { margin: 0; display: grid; grid-template-columns: 200px 1fr; gap: 8px 16px; }
.card dt { font-weight: 600; color: var(--muted); }
.card dd { margin: 0; }

footer.site {
  border-top: 1px solid var(--border);
  padding: 24px;
  margin-top: 60px;
  font-size: 14px;
  color: var(--muted);
  text-align: center;
}

footer.site a { color: var(--muted); margin: 0 8px; }

.lang {
  font-size: 13px;
  color: var(--muted);
}
.lang a { color: var(--accent); text-decoration: none; }

@media (max-width: 540px) {
  .card dl { grid-template-columns: 1fr; gap: 4px; }
  .card dt { margin-top: 8px; }
  h1 { font-size: 26px; }
  header.site nav a { margin-left: 12px; }
}