body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  max-width: 900px;
  margin: 40px auto;
  line-height: 1.8;
  color: #222;
}

h1, h2, h3 {
  line-height: 1.4;
}

a {
  color: #0055aa;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

footer {
  margin-top: 60px;
  padding-top: 20px;
  border-top: 1px solid #ccc;
  font-size: 0.9em;
  text-align: center;
}