:root {
  --bg: #fafbfc;
  --surface: #ffffff;
  --text: #111827;
  --muted: #4b5563;
  --muted-light: #6b7280;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --border: #e5e7eb;
  --summary-bg: #eff6ff;
  --summary-border: #3b82f6;
  --maxw: 48rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
}

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

a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

.topnav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  padding: 1rem 1.25rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  max-width: 100%;
}

.topnav .brand {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
}

.topnav .brand:hover {
  text-decoration: none;
  color: var(--accent);
}

.topnav nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.25rem;
  font-size: 0.9375rem;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2rem 1.25rem 3.5rem;
}

header.site {
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

header.site h1 {
  margin: 0 0 0.5rem;
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

header.site .meta {
  margin: 0;
  font-size: 0.95rem;
  color: var(--muted-light);
}

nav.links {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  font-size: 0.95rem;
}

.doc-lead {
  font-size: 1.05rem;
  color: var(--muted);
  margin: 0 0 1.5rem;
}

.summary {
  margin: 1.5rem 0 2rem;
  padding: 1.1rem 1.25rem;
  background: var(--summary-bg);
  border-left: 4px solid var(--summary-border);
  border-radius: 0 0.375rem 0.375rem 0;
  font-size: 0.98rem;
  color: var(--muted);
}

.summary strong {
  color: var(--text);
}

main section {
  margin-bottom: 2rem;
}

main h2 {
  margin: 2.25rem 0 0.75rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.3;
}

main h2:first-of-type {
  margin-top: 0;
}

main h3 {
  margin: 1.5rem 0 0.5rem;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
}

main p,
main li {
  color: var(--muted);
  margin: 0.6rem 0;
}

main ul {
  padding-left: 1.35rem;
}

main li {
  margin: 0.35rem 0;
}

main strong {
  color: var(--text);
  font-weight: 600;
}

footer.site {
  margin-top: 3rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
  color: var(--muted-light);
}

footer.site p {
  margin: 0.4rem 0;
}

footer.site nav.links {
  margin-top: 0.75rem;
}