body {
  font-family: system-ui, sans-serif;
  background: #fefefe;
  color: #111;
  margin: 0;
  padding: 0;
  line-height: 1.6;
}
header, main, footer {
  max-width: 600px;
  margin: auto;
  padding: 1rem;
}
h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}
nav a {
  margin-right: 1rem;
}
footer {
  font-size: 0.875rem;
  color: #666;
  text-align: center;
  margin-top: 2rem;
}
a {
  color: #333;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}