body {
    background-color: #f8f9fa;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.navbar-brand {
    font-weight: bold;
}

.jumbotron {
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.card {
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

.card-header {
    background-color: #f8f9fa;
    border-bottom: 1px solid #dee2e6;
    font-weight: bold;
}

.btn {
    border-radius: 5px;
}

.table {
    background-color: #fff;
}

#vista-previa {
    background-color: #fff;
    border: 1px solid #dee2e6;
    border-radius: 5px;
    padding: 20px;
}

#carta-content {
    background-color: #fff;
    border: 1px solid #dee2e6;
    border-radius: 5px;
    padding: 20px;
}

#qrcode {
    display: inline-block;
    padding: 10px;
    background-color: #fff;
    border: 1px solid #ddd;
    border-radius: 5px;
    margin-top: 10px;
}

footer {
    margin-top: 50px;
}

.alert {
    border-radius: 5px;
}

.form-control {
    border-radius: 5px;
}

.form-group label {
    font-weight: 500;
}

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .card {
        margin-bottom: 15px;
    }
}