:root {
  --color-bg: #fafafa;
  --color-fg: #1a1a1a;
  --color-muted: #555;
  --color-accent: #045C21;
  --color-border: #e0e0e0;
  --max-width: 720px;
}

* { box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-fg);
  line-height: 1.6;
  margin: 0;
  padding: 2rem 1rem;
}

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

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

header h1 {
  margin: 0;
  font-size: 1.6rem;
  color: var(--color-accent);
}

header nav {
  margin-top: 0.75rem;
  font-size: 0.9rem;
}

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

header nav a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

h2 {
  margin-top: 2.5rem;
  font-size: 1.2rem;
  color: var(--color-accent);
}

h3 {
  margin-top: 1.5rem;
  font-size: 1rem;
}

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

ul {
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.4rem;
}

footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.85rem;
  color: var(--color-muted);
}

code {
  background: #efefef;
  padding: 0.1rem 0.3rem;
  border-radius: 3px;
  font-size: 0.9em;
}