/* Spinner inside button */
.spu-spinner {
    border: 3px solid rgba(255,255,255,0.3);
    border-top: 3px solid #00e1ff;
    border-radius: 50%;
    width: 18px;
    height: 18px;
    animation: spin 0.8s linear infinite;
    margin-left: 10px;
    display: none;
}

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

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}