:root { --accent: #0b8185; }
body {
  margin: 0 auto;
  max-width: 42rem;
  padding: 1.5rem 1rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: #222;
  background: #fff;
}

h1, h2, h3 { line-height: 1.25; }

h1 {
  font-size: 2rem;
  margin: 0 0 0.5rem;
}

h1 span { color: var(--accent); }

h2 {
  font-size: 1.5rem;
  margin: 1.75rem 0 0.5rem;
}

h3 {
  font-size: 1.125rem;
  margin: 1rem 0 0.25rem;
}

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

a:hover, a:focus { text-decoration: underline; }

ul {
  padding-left: 1.25rem;
  margin: 0;
}

li { margin-bottom: 0.5rem; }

footer {
  margin-top: 3rem;
  font-size: 0.875rem;
  color: #666;
  text-align: center;
}