/* Loader Spinner */
.loader {
    width: 20px;
    height: 20px;
    border: 2.5px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    display: inline-block;
}

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

/* Global button disabled state */
.btn-download:disabled {
    cursor: not-allowed !important;
    opacity: 0.75;
    transform: none !important;
    box-shadow: none !important;
}

/* Helper class to hide elements */
.hidden {
    display: none !important;
}