body {
    font-family: Arial, sans-serif;
    background-color: #f4f6f8;
    color: #1f2937;
    margin: 0;
    padding: 0;
}

main {
    max-width: 900px;
    margin: 60px auto;
    background: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
}

h1 {
    color: #1e3a5f;
}

nav {
    margin: 20px 0 30px 0;
}

nav a {
    color: #1e3a5f;
    text-decoration: none;
    margin-right: 16px;
    font-weight: bold;
}

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