body {
    font-family: Arial, Helvetica, sans-serif;
    background: #f2f2f2;
    margin: 0;
    padding: 0;
}

header {
    background: #2176c1;
    padding: 1rem;
    color: white;
}

nav {
    background: #005b9f;
    padding: 0.5rem;
}

nav a {
    color: white;
    margin-right: 1rem;
    text-decoration: none;
    font-weight: bold;
}

main {
    padding: 2rem;
    background: white;
    max-width: 900px;
    margin: auto;
}

footer {
    background: #ddd;
    padding: 1rem;
    text-align: center;
    font-size: 0.8rem;
}