body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: #f8f9fa;
  margin: 0;
  padding: 0;
  color: #222;
}
header {
  background: #243763;
  color: #fff;
  padding: 2rem 1rem 1rem 1rem;
  text-align: center;
}
nav {
  margin-top: 1rem;
  margin-bottom: 2rem;
  text-align: center;
}
nav a {
  margin: 0 1rem;
  color: #243763;
  text-decoration: none;
  font-weight: bold;
}
nav a:hover {
  text-decoration: underline;
}
main {
  max-width: 800px;
  margin: 2rem auto;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 0 10px #ccc;
  padding: 2rem;
}
h1, h2 {
  color: #243763;
}
ul {
  line-height: 1.7;
}
footer {
  text-align: center;
  padding: 2rem 0;
  color: #888;
  margin-top: 2rem;
}