:root {
  --ink: #1b1f23;
  --muted: #57606a;
  --line: #d8dee4;
  --bg: #ffffff;
  --accent: #2f6feb;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.55;
}

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  border-bottom: 1px solid var(--line);
  padding: 18px 0;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-weight: 700;
  letter-spacing: -0.01em;
}

.site-header nav a {
  margin-left: 20px;
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
}

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

main.wrap {
  padding-top: 48px;
  padding-bottom: 64px;
}

.hero h1 {
  font-size: 32px;
  line-height: 1.25;
  margin: 0 0 16px;
}

.lead {
  color: var(--muted);
  font-size: 17px;
  max-width: 620px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin: 48px 0;
}

.card {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 20px;
}

.card h2 {
  font-size: 16px;
  margin: 0 0 8px;
}

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

.cta {
  border-top: 1px solid var(--line);
  padding-top: 32px;
}

.cta h2 {
  font-size: 18px;
}

.doc h1 {
  font-size: 26px;
  margin-bottom: 20px;
}

.doc h2 {
  font-size: 18px;
  margin-top: 36px;
}

.doc code {
  background: #f2f4f7;
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 13px;
}

.doc pre {
  background: #f6f8fa;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 16px;
  overflow-x: auto;
  font-size: 13px;
}

.doc pre code {
  background: none;
  padding: 0;
}

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

.site-footer {
  border-top: 1px solid var(--line);
  padding: 24px 0;
  color: var(--muted);
  font-size: 13px;
}