/* Protección visual complementaria. La autorización real se realiza en PHP. */
.protected-media {
    -webkit-user-drag: none;
    user-drag: none;
    -webkit-touch-callout: none;
    user-select: none;
}
img[data-protected-src] {
    opacity: 0;
    transition: opacity .22s ease;
}
img[data-protected-src].is-loaded,
img.protected-media.is-loaded {
    opacity: 1;
}
.protected-media-error {
    opacity: .18 !important;
}