:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #6b6b6b;
  --accent: #0066cc;
  --max-width: 42rem;
  --line-height: 1.6;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1a1a;
    --fg: #e8e8e8;
    --muted: #a0a0a0;
    --accent: #4d9fff;
  }
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: var(--line-height);
  color: var(--fg);
  background: var(--bg);
  padding: 2rem 1rem;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  margin-bottom: 1rem;
  font-weight: 600;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
}

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

h3 {
  font-size: 1.5rem;
  margin-top: 1.5rem;
}

p {
  margin-bottom: 1rem;
}

ul, ol {
  margin-bottom: 1rem;
  padding-left: 2rem;
}

li {
  margin-bottom: 0.5rem;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

footer {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--muted);
  color: var(--muted);
  font-size: 0.875rem;
}

@media print {
  body {
    background: white;
    color: black;
    padding: 0;
  }
  
  a {
    color: black;
    text-decoration: underline;
  }
  
  footer {
    border-top-color: #999;
  }
}