:root {
  color-scheme: light;
  --bg: #f9fafb;
  --ink: #111827;
  --muted: #4b5563;
  --accent: #4054b2;
  --border: #314080;
  --surface: #f9fafb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.58;
}

header,
nav,
main,
footer {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

header {
  padding-top: 48px;
  padding-bottom: 24px;
}

.brand {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: 0;
}

header p,
footer,
p,
li {
  color: var(--muted);
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding-bottom: 24px;
}

nav a {
  border: 1px solid rgba(49, 64, 128, 0.34);
  color: var(--accent);
  text-decoration: none;
  padding: 8px 12px;
  border-radius: 6px;
  background: var(--surface);
}

nav a.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #f9fafb;
}

main {
  background: var(--surface);
  border: 1px solid rgba(49, 64, 128, 0.24);
  border-radius: 8px;
  padding-top: 24px;
  padding-bottom: 32px;
}

h1,
h2,
h3 {
  line-height: 1.2;
}

h1 {
  font-size: 30px;
}

h2 {
  margin-top: 32px;
  font-size: 22px;
  border-top: 1px solid rgba(49, 64, 128, 0.2);
  padding-top: 24px;
}

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

code {
  background: rgba(64, 84, 178, 0.08);
  color: var(--ink);
  border-radius: 4px;
  padding: 1px 4px;
}

pre {
  overflow-x: auto;
  border: 1px solid rgba(49, 64, 128, 0.18);
  background: #f3f4f6;
  border-radius: 6px;
  padding: 14px;
}

footer {
  padding-top: 20px;
  padding-bottom: 48px;
  font-size: 14px;
}