@keyframes spin {
                0% { transform: rotate(0deg); }
                100% { transform: rotate(360deg); }
              }

              #form-message {
                opacity: 0;
                transition: opacity 0.4s ease;
              }

              #form-message.show {
                opacity: 1;
              }

              #form-spinner span {
                display: inline-block;
                width: 20px;
                height: 20px;
                border: 3px solid #ccc;
                border-top: 3px solid #000;
                border-radius: 50%;
                animation: spin 0.8s linear infinite;
              }