body {
  margin: 0;
  font-family: system-ui, sans-serif;
  line-height: 1.6;
  color: #222;
  background: #fff;
}

header {
  background: #f5f5f5;
  border-bottom: 1px solid #ddd;
  padding: 1rem 0;
}

header h1 {
  margin: 0;
  font-size: 1.5rem;
}

nav {
  margin-top: .5rem;
}

nav a {
  margin-right: 1rem;
  text-decoration: none;
  color: #333;
}

nav a:hover {
  text-decoration: underline;
}

.container {
  width: min(100% - 2rem, 800px);
  margin: 0 auto;
}

.section {
  padding: 2rem 0;
}

footer {
  background: #f5f5f5;
  border-top: 1px solid #ddd;
  text-align: center;
  padding: 1rem 0;
  font-size: .9rem;
  color: #555;
}