body {
    background-color: #f5f5f5;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    color: #333;
}

.container {
    max-width: 700px;
    margin: 5rem auto;
    background-color: #ffffff;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    text-align: center;
}

h1, h2, h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

.cards {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-top: 1rem;
}

.card {
    background-color: #ffffff;
    border-radius: 12px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
    padding: 1.5rem;
    text-align: center;
}

.success {
    color: green;
    font-weight: bold;
}

.error {
    color: red;
    font-weight: bold;
}

footer {
    margin-top: 2rem;
    font-size: 0.9rem;
    color: #999;
}