body {
    font-family: Arial, sans-serif;
    margin: 0; padding: 0;
    background: #f9f9f9;
    color: #333;
}

header {
    background: #0073e6;
    padding: 15px 20px;
}

.main-nav a {
    color: white;
    text-decoration: none;
    margin-right: 20px;
    font-weight: bold;
}

.main-nav a.active,
.main-nav a:hover {
    text-decoration: underline;
}

main {
    max-width: 1100px;
    margin: 20px auto;
    background: white;
    padding: 20px 30px;
    border-radius: 6px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

footer {
    text-align: center;
    padding: 15px;
    font-size: 14px;
    color: #666;
    background: #eee;
}