* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: Arial, sans-serif;
    background: #f2f4f7;
    color: #222;
}

header {
    background: #0a3161;
    color: white;
    text-align: center;
    padding: 50px 20px;
}

header h1 {
    margin-bottom: 10px;
    font-size: 36px;
}

main {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 60vh;
}

.card {
    background: white;
    padding: 35px;
    width: 90%;
    max-width: 500px;
    text-align: center;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.card h2 {
    margin-bottom: 15px;
}

.card p {
    margin-bottom: 20px;
}

button {
    background: #0a3161;
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
}

button:hover {
    opacity: 0.85;
}

#message {
    margin-top: 20px;
    font-weight: bold;
}

footer {
    text-align: center;
    padding: 20px;
    color: #666;
}