body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  margin: 0;
  background: #fff;
  color: #111;
  line-height: 1.7;
  padding: 24px;
}
h1,
h2,
h3,
h4 {
  color: #0b3c42;
}
a {
  color: #0a66c2;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
ul {
  padding-left: 20px;
}
main {
  max-width: 900px;
  margin: auto;
}
footer {
  margin-top: 40px;
  border-top: 1px solid #ddd;
  padding-top: 16px;
  text-align: center;
  color: #666;
  font-size: 0.95rem;
}