/* Responsive Images */
.responsive-picture {
    display: block;
    width: 100%;
}

.responsive-image {
    max-width: 100%;
    height: auto;
    display: block;
}

.responsive-video {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Lazy loading placeholder */
img[loading="lazy"] {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading-shimmer 1.5s infinite;
}

@keyframes loading-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}