/**
 * Modern Skeleton Loading System
 * Clean skeleton placeholders for image loading
 */

/* Base skeleton styles with GPU acceleration */
.skeleton {
    background: linear-gradient(90deg, #ffffff 25%, #f8fafc 50%, #ffffff 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border: 1px solid #f1f5f9;
    border-radius: 8px;
    position: relative;
    overflow: hidden;
    will-change: background-position;
    transform: translateZ(0);
    backface-visibility: hidden;
    contain: layout style paint;
}

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

    100% {
        background-position: -200% 0;
    }
}

/* Optimized shimmer animation with GPU acceleration */
@keyframes skeleton-shimmer-optimized {
    0% {
        transform: translate3d(-100%, 0, 0);
    }
    100% {
        transform: translate3d(100%, 0, 0);
    }
}

/* Image skeleton with GPU optimization */
.skeleton-image {
    width: 100%;
    height: 200px;
    background: #ffffff;
    border: 1px solid #f1f5f9;
    border-radius: 8px;
    position: relative;
    overflow: hidden;
    will-change: transform;
    transform: translateZ(0);
    backface-visibility: hidden;
    contain: layout style paint;
}

.skeleton-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg,
            transparent,
            rgba(241, 245, 249, 0.8),
            transparent);
    animation: skeleton-shimmer-optimized 1.5s infinite;
    will-change: transform;
    transform: translate3d(-100%, 0, 0);
    backface-visibility: hidden;
}

@keyframes skeleton-shimmer {
    0% {
        left: -100%;
    }

    100% {
        left: 100%;
    }
}

/* Product card skeleton with containment */
.skeleton-product-card {
    padding: 16px;
    border: 1px solid #f1f5f9;
    border-radius: 12px;
    background: #ffffff;
    contain: layout style;
    isolation: isolate;
}

.skeleton-product-image {
    width: 100%;
    aspect-ratio: 1;
    background: #ffffff;
    border: 1px solid #f1f5f9;
    border-radius: 8px;
    margin-bottom: 12px;
    position: relative;
    overflow: hidden;
    will-change: transform;
    transform: translateZ(0);
    backface-visibility: hidden;
    contain: layout style paint;
}

.skeleton-product-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg,
            transparent,
            rgba(241, 245, 249, 0.8),
            transparent);
    animation: skeleton-shimmer-optimized 1.5s infinite;
    will-change: transform;
    transform: translate3d(-100%, 0, 0);
    backface-visibility: hidden;
}

/* Text skeleton lines with GPU optimization */
.skeleton-text {
    height: 16px;
    background: #ffffff;
    border: 1px solid #f1f5f9;
    border-radius: 4px;
    margin-bottom: 8px;
    position: relative;
    overflow: hidden;
    will-change: transform;
    transform: translateZ(0);
    backface-visibility: hidden;
    contain: layout style paint;
}

.skeleton-text::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg,
            transparent,
            rgba(241, 245, 249, 0.8),
            transparent);
    animation: skeleton-shimmer-optimized 1.5s infinite;
    will-change: transform;
    transform: translate3d(-100%, 0, 0);
    backface-visibility: hidden;
}

.skeleton-text.short {
    width: 60%;
}

.skeleton-text.medium {
    width: 80%;
}

.skeleton-text.long {
    width: 100%;
}

/* Title skeleton with GPU optimization */
.skeleton-title {
    height: 20px;
    background: #ffffff;
    border: 1px solid #f1f5f9;
    border-radius: 4px;
    margin-bottom: 12px;
    width: 75%;
    position: relative;
    overflow: hidden;
    will-change: transform;
    transform: translateZ(0);
    backface-visibility: hidden;
    contain: layout style paint;
}

.skeleton-title::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg,
            transparent,
            rgba(241, 245, 249, 0.8),
            transparent);
    animation: skeleton-shimmer-optimized 1.5s infinite;
    will-change: transform;
    transform: translate3d(-100%, 0, 0);
    backface-visibility: hidden;
}

/* Price skeleton with GPU optimization */
.skeleton-price {
    height: 18px;
    background: #ffffff;
    border: 1px solid #f1f5f9;
    border-radius: 4px;
    width: 40%;
    position: relative;
    overflow: hidden;
    will-change: transform;
    transform: translateZ(0);
    backface-visibility: hidden;
    contain: layout style paint;
}

.skeleton-price::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg,
            transparent,
            rgba(241, 245, 249, 0.8),
            transparent);
    animation: skeleton-shimmer-optimized 1.5s infinite;
    will-change: transform;
    transform: translate3d(-100%, 0, 0);
    backface-visibility: hidden;
}

/* Gallery skeleton with containment */
.skeleton-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    padding: 20px;
    contain: layout style;
    isolation: isolate;
}

/* Hero image skeleton with GPU optimization */
.skeleton-hero {
    width: 100%;
    height: 400px;
    background: #ffffff;
    border: 1px solid #f1f5f9;
    border-radius: 12px;
    position: relative;
    overflow: hidden;
    will-change: transform;
    transform: translateZ(0);
    backface-visibility: hidden;
    contain: layout style paint;
}

.skeleton-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg,
            transparent,
            rgba(241, 245, 249, 0.8),
            transparent);
    animation: skeleton-shimmer-optimized 1.8s infinite;
    will-change: transform;
    transform: translate3d(-100%, 0, 0);
    backface-visibility: hidden;
}

/* Avatar skeleton with GPU optimization */
.skeleton-avatar {
    width: 40px;
    height: 40px;
    background: #ffffff;
    border: 1px solid #f1f5f9;
    border-radius: 50%;
    position: relative;
    overflow: hidden;
    will-change: transform;
    transform: translateZ(0);
    backface-visibility: hidden;
    contain: layout style paint;
}

.skeleton-avatar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg,
            transparent,
            rgba(241, 245, 249, 0.8),
            transparent);
    animation: skeleton-shimmer-optimized 1.2s infinite;
    will-change: transform;
    transform: translate3d(-100%, 0, 0);
    backface-visibility: hidden;
}

/* Loading state for actual images with GPU optimization */
.image-loading {
    position: relative;
    background: #ffffff;
    border: 1px solid #f1f5f9;
    border-radius: 8px;
    overflow: hidden;
    will-change: transform;
    transform: translateZ(0);
    backface-visibility: hidden;
    contain: layout style paint;
}

/* Progressive loading state */
.progressive-loading {
    position: relative;
    background: transparent;
    border: none;
    overflow: hidden;
}

.progressive-loading img {
    transition: filter 0.5s ease, transform 0.5s ease;
}

/* Progressive loading blur effect */
.progressive-loading img[style*="blur"] {
    filter: blur(5px);
    transform: scale(1.05);
    will-change: filter, transform;
}

/* High-quality image loaded state */
.progressive-loading img:not([style*="blur"]) {
    filter: none;
    transform: scale(1);
}

.image-loading::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg,
            transparent,
            rgba(241, 245, 249, 0.8),
            transparent);
    animation: skeleton-shimmer-optimized 1.5s infinite;
    will-change: transform;
    transform: translate3d(-100%, 0, 0);
    backface-visibility: hidden;
    z-index: 1;
}

.image-loading img {
    opacity: 0;
    transition: opacity 0.3s ease;
}

.image-loaded::before {
    display: none;
}

.image-loaded img {
    opacity: 1;
}

/* Error state */
.image-error {
    background: #fee2e2;
    border: 1px solid #fecaca;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100px;
    color: #dc2626;
}

.image-error-message {
    font-size: 14px;
    text-align: center;
    padding: 20px;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {

    .skeleton,
    .skeleton-image,
    .skeleton-product-image,
    .skeleton-text,
    .skeleton-title,
    .skeleton-price,
    .skeleton-hero,
    .skeleton-avatar,
    .image-loading {
        background: #D3D3D3;
    }

    .skeleton::before,
    .skeleton-image::before,
    .skeleton-product-image::before,
    .skeleton-text::before,
    .skeleton-title::before,
    .skeleton-price::before,
    .skeleton-hero::before,
    .skeleton-avatar::before,
    .image-loading::before {
        background: linear-gradient(90deg,
                transparent,
                rgba(255, 255, 255, 0.3),
                transparent);
    }

    .skeleton-product-card {
        background: #FFFFFF;
        border-color: #FFFFFF;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {

    .skeleton,
    .skeleton::before,
    .skeleton-image::before,
    .skeleton-product-image::before,
    .skeleton-text::before,
    .skeleton-title::before,
    .skeleton-price::before,
    .skeleton-hero::before,
    .skeleton-avatar::before,
    .image-loading::before {
        animation: none;
    }
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .skeleton-gallery {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: 15px;
        padding: 15px;
    }

    .skeleton-hero {
        height: 250px;
    }

    .skeleton-product-image {
        aspect-ratio: 1.2;
    }
}