:root {
  color-scheme: light dark;
  --fg: #1a1a1a;
  --muted: #555;
  --bg: #fafafa;
  --card: #fff;
  --border: #e4e4e7;
  --accent: #2563eb;
  --code-bg: #f4f4f5;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #f4f4f5;
    --muted: #a1a1aa;
    --bg: #0a0a0a;
    --card: #18181b;
    --border: #27272a;
    --accent: #60a5fa;
    --code-bg: #1f1f23;
  }
}

* { box-sizing: border-box; }

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

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

header {
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
  padding-bottom: 1rem;
}

header h1 {
  margin: 0 0 0.25rem;
  font-size: 1.75rem;
}

header p {
  margin: 0;
  color: var(--muted);
}

nav a {
  color: var(--accent);
  text-decoration: none;
  margin-right: 1rem;
}

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

h2 {
  font-size: 1.25rem;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
}

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

code {
  background: var(--code-bg);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  font-size: 0.9em;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
  font-size: 0.875em;
  line-height: 1.5;
}

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

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
}

.card h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
}

.muted { color: var(--muted); font-size: 0.9rem; }

ol li, ul li { margin-bottom: 0.35rem; }