/**
 * Lazy Loading Styles
 * Visual feedback for image loading states
 */

/* Base lazy image styles */
img[data-lazy-src] {
    background: #f0f0f0;
    min-height: 50px;
    transition: opacity 0.3s ease-in-out;
}

/* Loading state */
img.lazy-loading {
    opacity: 0.6;
    background: linear-gradient(
        90deg,
        #f0f0f0 0%,
        #e0e0e0 50%,
        #f0f0f0 100%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

/* Loaded state */
img.lazy-loaded {
    opacity: 1;
    background: transparent;
}

/* Error state */
img.lazy-error {
    opacity: 0.5;
    background: #ffebee;
    border: 1px solid #ffcdd2;
}

/* Shimmer animation for loading */
@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

/* Skeleton loader for attribute options */
.option-image-skeleton {
    display: inline-block;
    width: 150px;
    height: 150px;
    background: linear-gradient(
        90deg,
        #f0f0f0 0%,
        #e0e0e0 50%,
        #f0f0f0 100%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 4px;
}

/* Color swatch lazy loading */
.color-swatch[data-lazy-src] {
    background: linear-gradient(
        90deg,
        #f0f0f0 0%,
        #e0e0e0 50%,
        #f0f0f0 100%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    img.lazy-loading,
    .option-image-skeleton,
    .color-swatch[data-lazy-src] {
        animation: none;
    }
    
    img[data-lazy-src] {
        transition: none;
    }
}

/* Loading spinner alternative (optional) */
.lazy-loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid rgba(0, 0, 0, 0.1);
    border-top-color: rgba(0, 0, 0, 0.4);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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