:root {
  --bg: #ffffff;
  --fg: #0f172a;
  --muted: #64748b;
  --accent: #2563eb;
  --border: #e2e8f0;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --fg: #f8fafc;
    --muted: #94a3b8;
    --accent: #60a5fa;
    --border: #334155;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 16px 64px;
}

header {
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
  padding-bottom: 16px;
}

.brand {
  display: inline-block;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--accent);
  text-decoration: none;
  margin-bottom: 8px;
}

h1, h2, h3 { line-height: 1.3; }
h1 { font-size: 1.75rem; margin: 0; }
h2 { font-size: 1.4rem; margin-top: 2em; }
h3 { font-size: 1.15rem; }

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

code {
  background: color-mix(in srgb, var(--fg) 8%, transparent);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.95em;
}

blockquote {
  border-left: 3px solid var(--accent);
  margin: 1em 0;
  padding: 0.5em 1em;
  color: var(--muted);
}

footer {
  margin-top: 64px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9em;
}

table {
  border-collapse: collapse;
  width: 100%;
  margin: 1em 0;
}
th, td {
  border: 1px solid var(--border);
  padding: 8px;
  text-align: left;
}
th { background: color-mix(in srgb, var(--fg) 5%, transparent); }