/**
 * Skeleton Loaders - Sprint 7
 * Mercana E-commerce Platform
 *
 * Componentes de loading animados para mejorar la percepción
 * de velocidad durante la carga de contenido.
 */

/* =========================================
   BASE SKELETON
   ========================================= */

.skeleton {
    background: linear-gradient(
        90deg,
        var(--color-gray-100) 0%,
        var(--color-gray-200) 50%,
        var(--color-gray-100) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite ease-in-out;
    border-radius: var(--radius-sm);
}

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

/* Skeleton variants */
.skeleton-text {
    height: 1rem;
    margin-bottom: 0.5rem;
}

.skeleton-text.skeleton-text-sm {
    height: 0.75rem;
}

.skeleton-text.skeleton-text-lg {
    height: 1.25rem;
}

.skeleton-text.skeleton-text-xl {
    height: 1.5rem;
}

/* Width variants */
.skeleton-w-full {
    width: 100%;
}

.skeleton-w-3\/4 {
    width: 75%;
}

.skeleton-w-1\/2 {
    width: 50%;
}

.skeleton-w-1\/3 {
    width: 33%;
}

.skeleton-w-1\/4 {
    width: 25%;
}

.skeleton-circle {
    border-radius: 50%;
}

.skeleton-rounded {
    border-radius: var(--radius-lg);
}

/* =========================================
   SKELETON PRODUCT CARD
   ========================================= */

.skeleton-product-card {
    background: var(--color-gray-50);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.skeleton-product-image {
    aspect-ratio: 4/5;
    background: linear-gradient(
        90deg,
        var(--color-gray-100) 0%,
        var(--color-gray-200) 50%,
        var(--color-gray-100) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite ease-in-out;
}

.skeleton-product-content {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.skeleton-product-category {
    height: 0.625rem;
    width: 40%;
    background: linear-gradient(
        90deg,
        var(--color-gray-100) 0%,
        var(--color-gray-200) 50%,
        var(--color-gray-100) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite ease-in-out;
    border-radius: var(--radius-sm);
}

.skeleton-product-title {
    height: 1.125rem;
    width: 80%;
    background: linear-gradient(
        90deg,
        var(--color-gray-100) 0%,
        var(--color-gray-200) 50%,
        var(--color-gray-100) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite ease-in-out;
    animation-delay: 0.1s;
    border-radius: var(--radius-sm);
}

.skeleton-product-description {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.skeleton-product-description .skeleton-text {
    height: 0.75rem;
}

.skeleton-product-description .skeleton-text:last-child {
    width: 60%;
}

.skeleton-product-price {
    height: 1.5rem;
    width: 35%;
    background: linear-gradient(
        90deg,
        var(--color-gray-100) 0%,
        var(--color-gray-200) 50%,
        var(--color-gray-100) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite ease-in-out;
    animation-delay: 0.2s;
    border-radius: var(--radius-sm);
    margin-top: 0.5rem;
}

.skeleton-product-button {
    height: 2.5rem;
    width: 100%;
    background: linear-gradient(
        90deg,
        var(--color-gray-100) 0%,
        var(--color-gray-200) 50%,
        var(--color-gray-100) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite ease-in-out;
    animation-delay: 0.3s;
    border-radius: var(--radius-md);
    margin-top: 0.5rem;
}

/* =========================================
   SKELETON STORE CARD
   ========================================= */

.skeleton-store-card {
    background: var(--color-gray-50);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    min-height: 280px;
}

.skeleton-store-logo {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(
        90deg,
        var(--color-gray-100) 0%,
        var(--color-gray-200) 50%,
        var(--color-gray-100) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite ease-in-out;
}

.skeleton-store-name {
    height: 1.25rem;
    width: 60%;
    background: linear-gradient(
        90deg,
        var(--color-gray-100) 0%,
        var(--color-gray-200) 50%,
        var(--color-gray-100) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite ease-in-out;
    animation-delay: 0.1s;
    border-radius: var(--radius-sm);
}

.skeleton-store-description {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
    width: 100%;
    align-items: center;
}

.skeleton-store-description .skeleton-text {
    height: 0.75rem;
    width: 90%;
}

.skeleton-store-description .skeleton-text:last-child {
    width: 70%;
}

.skeleton-store-button {
    height: 2.25rem;
    width: 50%;
    background: linear-gradient(
        90deg,
        var(--color-gray-100) 0%,
        var(--color-gray-200) 50%,
        var(--color-gray-100) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite ease-in-out;
    animation-delay: 0.2s;
    border-radius: var(--radius-full);
    margin-top: auto;
}

/* =========================================
   SKELETON GRID LAYOUTS
   ========================================= */

.skeleton-grid {
    display: grid;
    gap: 1.5rem;
}

.skeleton-grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.skeleton-grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.skeleton-grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 991.98px) {
    .skeleton-grid-4,
    .skeleton-grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 575.98px) {
    .skeleton-grid-4,
    .skeleton-grid-3,
    .skeleton-grid-2 {
        grid-template-columns: 1fr;
    }
}

/* =========================================
   SKELETON SEARCH RESULTS
   ========================================= */

.skeleton-search-result {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem;
    background: var(--color-gray-50);
    border-radius: var(--radius-md);
}

.skeleton-search-image {
    width: 50px;
    height: 50px;
    flex-shrink: 0;
    background: linear-gradient(
        90deg,
        var(--color-gray-100) 0%,
        var(--color-gray-200) 50%,
        var(--color-gray-100) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite ease-in-out;
    border-radius: var(--radius-sm);
}

.skeleton-search-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.skeleton-search-title {
    height: 1rem;
    width: 70%;
    background: linear-gradient(
        90deg,
        var(--color-gray-100) 0%,
        var(--color-gray-200) 50%,
        var(--color-gray-100) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite ease-in-out;
    border-radius: var(--radius-sm);
}

.skeleton-search-meta {
    height: 0.75rem;
    width: 40%;
    background: linear-gradient(
        90deg,
        var(--color-gray-100) 0%,
        var(--color-gray-200) 50%,
        var(--color-gray-100) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite ease-in-out;
    animation-delay: 0.1s;
    border-radius: var(--radius-sm);
}

/* =========================================
   SKELETON HERO/BANNER
   ========================================= */

.skeleton-hero {
    height: 300px;
    background: linear-gradient(
        90deg,
        var(--color-gray-100) 0%,
        var(--color-gray-200) 50%,
        var(--color-gray-100) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite ease-in-out;
    border-radius: var(--radius-lg);
}

.skeleton-hero-sm {
    height: 180px;
}

.skeleton-hero-lg {
    height: 400px;
}

/* =========================================
   SKELETON IMAGE LAZY LOADING
   ========================================= */

.skeleton-image-wrapper {
    position: relative;
    overflow: hidden;
}

.skeleton-image-wrapper .skeleton-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        90deg,
        var(--color-gray-100) 0%,
        var(--color-gray-200) 50%,
        var(--color-gray-100) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite ease-in-out;
    z-index: 1;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.skeleton-image-wrapper.loaded .skeleton-overlay {
    opacity: 0;
    visibility: hidden;
}

/* =========================================
   SKELETON INLINE (PARA TEXTOS)
   ========================================= */

.skeleton-inline {
    display: inline-block;
    vertical-align: middle;
    height: 1em;
    min-width: 4em;
    background: linear-gradient(
        90deg,
        var(--color-gray-100) 0%,
        var(--color-gray-200) 50%,
        var(--color-gray-100) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite ease-in-out;
    border-radius: var(--radius-sm);
}

/* =========================================
   SKELETON CART ITEM
   ========================================= */

.skeleton-cart-item {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background: var(--color-gray-50);
    border-radius: var(--radius-md);
}

.skeleton-cart-image {
    width: 80px;
    height: 80px;
    flex-shrink: 0;
    background: linear-gradient(
        90deg,
        var(--color-gray-100) 0%,
        var(--color-gray-200) 50%,
        var(--color-gray-100) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite ease-in-out;
    border-radius: var(--radius-sm);
}

.skeleton-cart-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 0.5rem;
}

.skeleton-cart-title {
    height: 1rem;
    width: 60%;
    background: linear-gradient(
        90deg,
        var(--color-gray-100) 0%,
        var(--color-gray-200) 50%,
        var(--color-gray-100) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite ease-in-out;
    border-radius: var(--radius-sm);
}

.skeleton-cart-meta {
    height: 0.75rem;
    width: 40%;
    background: linear-gradient(
        90deg,
        var(--color-gray-100) 0%,
        var(--color-gray-200) 50%,
        var(--color-gray-100) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite ease-in-out;
    animation-delay: 0.1s;
    border-radius: var(--radius-sm);
}

.skeleton-cart-price {
    height: 1.25rem;
    width: 25%;
    background: linear-gradient(
        90deg,
        var(--color-gray-100) 0%,
        var(--color-gray-200) 50%,
        var(--color-gray-100) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite ease-in-out;
    animation-delay: 0.2s;
    border-radius: var(--radius-sm);
    margin-left: auto;
    align-self: center;
}

/* =========================================
   FADE IN TRANSITION (AFTER SKELETON)
   ========================================= */

.skeleton-content-loaded {
    animation: skeleton-fade-in 0.4s ease-out;
}

@keyframes skeleton-fade-in {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* =========================================
   PULSE VARIANT (ALTERNATIVA A SHIMMER)
   ========================================= */

.skeleton-pulse {
    background: var(--color-gray-200);
    animation: skeleton-pulse-anim 1.5s infinite ease-in-out;
}

@keyframes skeleton-pulse-anim {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.4;
    }
}

/* =========================================
   ACCESIBILIDAD
   ========================================= */

@media (prefers-reduced-motion: reduce) {
    .skeleton,
    .skeleton-product-image,
    .skeleton-product-category,
    .skeleton-product-title,
    .skeleton-product-price,
    .skeleton-product-button,
    .skeleton-store-logo,
    .skeleton-store-name,
    .skeleton-store-button,
    .skeleton-search-image,
    .skeleton-search-title,
    .skeleton-search-meta,
    .skeleton-hero,
    .skeleton-image-wrapper .skeleton-overlay,
    .skeleton-inline,
    .skeleton-cart-image,
    .skeleton-cart-title,
    .skeleton-cart-meta,
    .skeleton-cart-price,
    .skeleton-pulse {
        animation: none;
        background: var(--color-gray-200);
    }
}