body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f4f6f8;
    color: #333;
}
header {
    background-color: #0066cc;
    color: white;
    padding: 1rem;
    text-align: center;
}
main {
    max-width: 900px;
    margin: 2rem auto;
    padding: 0 1rem;
}
.cards {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 2rem;
}
.card {
    background: white;
    border-radius: 8px;
    padding: 1.5rem 2rem;
    flex: 1 1 180px;
    max-width: 220px;
    text-align: center;
    text-decoration: none;
    color: #0066cc;
    font-weight: bold;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: background-color 0.3s ease, color 0.3s ease;
}
.card:hover {
    background-color: #0066cc;
    color: white;
}
ul {
    list-style: none;
    padding: 0;
}
li.success {
    color: green;
}
li.error {
    color: red;
}
li.info {
    color: #007bff;
}
h1 {
    margin-top: 0;
}