:root {
  color-scheme: light dark;
  --fg: #1b1b1b;
  --bg: #fdfdfb;
  --muted: #5f5f5f;
  --accent: #2f6f4f;
  --border: #ddd;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.5;
}

.site-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
}

.site-title {
  font-weight: 700;
  font-size: 1.1rem;
  color: inherit;
  text-decoration: none;
}

main {
  max-width: 42rem;
  margin: 0 auto;
  padding: 1.5rem;
}

.intro {
  margin-bottom: 2.5rem;
}

.section {
  margin-bottom: 3rem;
}

.section h1 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}

.section h2 {
  font-size: 1.15rem;
  margin-top: 1.75rem;
  margin-bottom: 0.5rem;
}

.section h3 {
  font-size: 1rem;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

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

ul {
  padding-left: 1.25rem;
}

li {
  margin-bottom: 0.35rem;
}

.site-footer {
  max-width: 42rem;
  margin: 0 auto;
  padding: 1.5rem;
  color: var(--muted);
  font-size: 0.85rem;
}

@media print {
  .site-header, .site-footer {
    display: none;
  }
}