:root {
  --fg: #1a1a1a;
  --muted: #666;
  --accent: #0077c5;
  --bg: #ffffff;
  --border: #e5e5e5;
  --code-bg: #f6f8fa;
}

* { box-sizing: border-box; }

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.6;
  margin: 0;
  padding: 0;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}

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

header .brand {
  max-width: 720px;
  margin: 0 auto;
  font-weight: 600;
  font-size: 1rem;
  color: var(--fg);
  text-decoration: none;
}

footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 4rem;
}

footer a { color: var(--muted); }

h1 {
  font-size: 1.75rem;
  margin: 0 0 0.5rem;
  letter-spacing: -0.01em;
}

h2 {
  font-size: 1.15rem;
  margin: 2rem 0 0.5rem;
}

p { margin: 0.75rem 0; }

p.lead {
  color: var(--muted);
  font-size: 1.05rem;
  margin-bottom: 2rem;
}

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

code, pre {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.9em;
  background: var(--code-bg);
  border-radius: 4px;
}

code { padding: 0.1em 0.35em; }

pre {
  padding: 1rem;
  overflow-x: auto;
  border: 1px solid var(--border);
}

pre code { background: transparent; padding: 0; }

ul { padding-left: 1.5rem; }
li { margin: 0.25rem 0; }

.muted { color: var(--muted); }
.small { font-size: 0.85rem; }

.notice {
  background: var(--code-bg);
  border-left: 3px solid var(--accent);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  border-radius: 0 4px 4px 0;
}