body {
  font-family: system-ui, sans-serif;
  margin: 0;
  line-height: 1.6;
}
header, main, footer {
  max-width: 960px;
  margin: auto;
  padding: 1rem;
}
nav a {
  margin-right: 1rem;
  text-decoration: none;
  color: #003366;
}
h1, h2 {
  color: #002244;
}
.notice {
  padding: 1rem;
  background: #f2f2f2;
  border-left: 4px solid #999;
}
footer {
  font-size: 0.85rem;
  color: #555;
}