body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #0f172a;
    color: white;
}

header {
    background: #0055bb;
    padding: 20px;
    text-align: center;
}

.container {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    padding: 20px;
    justify-content: center;
}

.card {
    background: #1e293b;
    padding: 20px;
    border-radius: 12px;
    width: 250px;
    box-shadow: 0 0 10px rgba(0,0,0,0.4);
    transition: 0.3s;
}

.card:hover {
    transform: scale(1.05);
}

button {
    background: #0055bb;
    border: none;
    padding: 10px;
    color: white;
    border-radius: 6px;
    cursor: pointer;
    margin-top: 10px;
}

.resultado {
    margin-top: 10px;
    font-weight: bold;
}

footer {
    text-align: center;
    padding: 15px;
    background: #020617;
}