/* Skeleton Loading Screens for Better Perceived Performance */

/* Skeleton base styles */
.skeleton {
    background: linear-gradient(
        90deg,
        var(--bg-elevated) 0%,
        var(--bg-card) 50%,
        var(--bg-elevated) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: 0.5rem;
    position: relative;
    overflow: hidden;
}

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

.skeleton::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.1) 50%,
        transparent 100%
    );
    animation: skeleton-shimmer 2s ease-in-out infinite;
}

@keyframes skeleton-shimmer {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(100%);
    }
}

/* Product Card Skeleton */
.skeleton-product-card {
    background: var(--bg-card);
    border-radius: 1rem;
    border: 1px solid var(--border-subtle);
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.skeleton-product-image {
    width: 100%;
    height: 200px;
    border-radius: 0.75rem;
}

.skeleton-product-title {
    width: 80%;
    height: 1.5rem;
    border-radius: 0.25rem;
}

.skeleton-product-price {
    width: 40%;
    height: 1.25rem;
    border-radius: 0.25rem;
}

.skeleton-product-button {
    width: 100%;
    height: 3rem;
    border-radius: 2rem;
    margin-top: 0.5rem;
}

/* Products Grid Skeleton */
.skeleton-products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    padding: 2rem 0;
}

/* Hero Skeleton */
.skeleton-hero {
    min-height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 2rem;
    padding: 4rem 2rem;
}

.skeleton-hero-title {
    width: min(600px, 80%);
    height: 4rem;
    border-radius: 0.5rem;
}

.skeleton-hero-subtitle {
    width: min(400px, 60%);
    height: 1.5rem;
    border-radius: 0.25rem;
}

.skeleton-hero-button {
    width: 200px;
    height: 3.5rem;
    border-radius: 2rem;
    margin-top: 1rem;
}

/* Cart Item Skeleton */
.skeleton-cart-item {
    display: flex;
    gap: 1.5rem;
    padding: 1.5rem;
    background: var(--bg-card);
    border-radius: 1rem;
    border: 1px solid var(--border-subtle);
    margin-bottom: 1rem;
}

.skeleton-cart-image {
    width: 100px;
    height: 100px;
    border-radius: 0.5rem;
    flex-shrink: 0;
}

.skeleton-cart-details {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.skeleton-cart-name {
    width: 70%;
    height: 1.25rem;
    border-radius: 0.25rem;
}

.skeleton-cart-quantity {
    width: 120px;
    height: 2.5rem;
    border-radius: 0.5rem;
}

.skeleton-cart-price {
    width: 100px;
    height: 1.5rem;
    border-radius: 0.25rem;
}

/* Text Skeletons */
.skeleton-text {
    height: 1rem;
    border-radius: 0.25rem;
    margin-bottom: 0.5rem;
}

.skeleton-text-short {
    width: 40%;
}

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

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

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

/* Avatar/Circle Skeleton */
.skeleton-circle {
    border-radius: 50%;
}

.skeleton-avatar {
    width: 48px;
    height: 48px;
}

/* 3D Viewer Skeleton */
.skeleton-viewer {
    width: 100%;
    height: 600px;
    border-radius: 1.5rem;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.skeleton-viewer-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    opacity: 0.3;
}

/* Image Gallery Skeleton */
.skeleton-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
    padding: 2rem 0;
}

.skeleton-gallery-item {
    width: 100%;
    aspect-ratio: 1;
    border-radius: 1rem;
}

/* Navbar Skeleton (for initial load) */
.skeleton-navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 80px;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-subtle);
    z-index: 1000;
    display: flex;
    align-items: center;
    padding: 0 2rem;
    gap: 2rem;
}

.skeleton-logo {
    width: 120px;
    height: 40px;
    border-radius: 0.5rem;
}

.skeleton-nav-links {
    display: flex;
    gap: 1rem;
    flex: 1;
    justify-content: flex-end;
}

.skeleton-nav-link {
    width: 80px;
    height: 2rem;
    border-radius: 0.5rem;
}

/* Table Skeleton */
.skeleton-table-row {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    border-bottom: 1px solid var(--border-subtle);
}

.skeleton-table-cell {
    height: 1.5rem;
    border-radius: 0.25rem;
}

/* Loading State Container */
.loading-state {
    opacity: 0.6;
    pointer-events: none;
    user-select: none;
}

/* Content Loaded - Fade In */
.content-loaded {
    animation: fade-in 0.3s ease-in;
}

@keyframes fade-in {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Hide skeleton when content is loaded */
.skeleton-hidden {
    display: none;
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    .skeleton,
    .skeleton::after {
        animation: none;
    }

    .skeleton {
        background: var(--bg-elevated);
    }
}

/* Mobile optimizations */
@media (max-width: 768px) {
    .skeleton-products-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .skeleton-hero-title {
        height: 3rem;
    }

    .skeleton-viewer {
        height: 400px;
    }

    .skeleton-gallery {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 1rem;
    }
}

/* Pulse variant (alternative animation) */
.skeleton-pulse {
    animation: skeleton-pulse 1.5s ease-in-out infinite;
}

@keyframes skeleton-pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}