.fb-form {
    max-width: 400px;
    background: #f7f7f7;
    padding: 15px;
    border-radius: 6px;
    box-shadow: 0 0 8px rgba(0,0,0,0.1);
    font-family: Arial, sans-serif;
}

.fb-form input[type="text"],
.fb-form input[type="email"],
.fb-form input[type="number"],
.fb-form textarea {
    width: 100%;
    padding: 8px;
    margin-top: 4px;
    margin-bottom: 12px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
}

.fb-form input[type="submit"] {
    background-color: #0073aa;
    color: white;
    border: none;
    padding: 10px 18px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
}

.fb-form input[type="submit"]:hover {
    background-color: #005177;
}

.fb-error {
    color: #b00;
    font-weight: bold;
    margin-bottom: 12px;
}

.fb-factura {
    max-width: 600px;
    background: #fff;
    border: 1px solid #ddd;
    padding: 20px;
    margin: 20px auto;
    font-family: Arial, sans-serif;
    border-radius: 6px;
}

.fb-factura h2 {
    margin-top: 0;
    margin-bottom: 15px;
}

.fb-print-btn {
    background-color: #0073aa;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
}

.fb-print-btn:hover {
    background-color: #005177;
}