/* Custom CSS */
 .form-container {
     max-width: 720px;
     margin: 50px auto;
     padding: 20px;
     background-color: #f8f9fa;
     border-radius: 10px;
     box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
 }

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

 .pure-radio input[type="radio"] {
     margin-right: 10px;
 }

 @media (max-width: 600px) {
     .pure-u-1-4 {
         width: 100%;
         margin-bottom: 10px;
     }
 }

 .invoice {
     max-width: 600px;
     margin: 20px auto;
     padding: 20px;
     background-color: #f8f9fa;
     border-radius: 10px;
     box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
     font-family: Arial, sans-serif;
 }

 .invoice h2 {
     text-align: center;
     margin-bottom: 20px;
 }

 .invoice-details p {
     margin: 10px 0;
     font-size: 16px;
 }

 .invoice-details .subtotal,
 .invoice-details .invoice-total {
     margin-top: 20px;
     padding-top: 10px;
     border-top: 2px solid #ddd;
     font-size: 18px;
 }

 .invoice-details .invoice-total {
     font-weight: bold;
     font-size: 20px;
     color: #007bff;
 }