:root {
  --fg: #222;
  --muted: #666;
  --accent: #0066cc;
  --bg: #fdfdfd;
  --line: #e5e5e5;
}

* { box-sizing: border-box; }

body {
  font-family: system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
  max-width: 720px;
  margin: 0 auto;
  padding: 40px 20px;
}

header nav {
  display: flex;
  gap: 18px;
  padding-bottom: 14px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--line);
}

header nav a {
  text-decoration: none;
  color: var(--accent);
  font-weight: 600;
}

header nav a:hover { text-decoration: underline; }

main h1 { line-height: 1.2; margin-top: 0; }
main h2 { margin-top: 1.8em; }

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

code {
  background: #f4f4f5;
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 0.9em;
}

pre {
  background: #f4f4f5;
  padding: 14px 16px;
  border-radius: 6px;
  overflow-x: auto;
}

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

blockquote {
  margin: 1.2em 0;
  padding: 2px 16px;
  border-left: 3px solid var(--accent);
  color: var(--muted);
}

hr { border: none; border-top: 1px solid var(--line); margin: 2em 0; }

footer {
  margin-top: 48px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9em;
}