/**
 * Music Library - Skeleton Loading Screens
 * 
 * Ce fichier contient les styles pour les états de chargement
 * avec skeleton screens pour une meilleure UX.
 * 
 * @module assets/css/components/skeleton
 * @version 1.0.0
 */

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

.skeleton {
    background: linear-gradient(
        90deg,
        var(--music-bg-secondary) 0%,
        var(--music-bg-hover) 50%,
        var(--music-bg-secondary) 100%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s ease-in-out infinite;
    border-radius: var(--music-radius);
    position: relative;
    overflow: hidden;
}

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

/* ============================================
   SKELETON SHAPES
   ============================================ */

.skeleton-text {
    height: 1em;
    margin-bottom: 0.5em;
    border-radius: 4px;
}

.skeleton-text:last-child {
    margin-bottom: 0;
    width: 80%;
}

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

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

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

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

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

.skeleton-square {
    aspect-ratio: 1;
}

/* ============================================
   SKELETON TRACK CARD
   ============================================ */

.skeleton-track-card {
    background: var(--music-bg-card);
    border: 1px solid var(--music-border);
    border-radius: var(--music-radius);
    padding: var(--music-spacing-md);
    display: flex;
    align-items: center;
    gap: var(--music-spacing-md);
}

.skeleton-track-cover {
    width: 56px;
    height: 56px;
    flex-shrink: 0;
}

.skeleton-track-info {
    flex: 1;
    min-width: 0;
}

.skeleton-track-title {
    height: 1.125rem;
    width: 70%;
    margin-bottom: 8px;
}

.skeleton-track-artist {
    height: 0.875rem;
    width: 50%;
}

.skeleton-track-actions {
    display: flex;
    gap: var(--music-spacing-sm);
}

.skeleton-track-action {
    width: 36px;
    height: 36px;
    border-radius: 50%;
}

/* ============================================
   SKELETON TRACK LIST
   ============================================ */

.skeleton-tracks-list {
    display: flex;
    flex-direction: column;
    gap: var(--music-spacing-sm);
}

/* ============================================
   SKELETON TRACK GRID
   ============================================ */

.skeleton-tracks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--music-spacing-md);
}

.skeleton-track-grid-card {
    background: var(--music-bg-card);
    border: 1px solid var(--music-border);
    border-radius: var(--music-radius);
    padding: var(--music-spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.skeleton-track-grid-cover {
    width: 100%;
    aspect-ratio: 1;
    margin-bottom: var(--music-spacing-md);
}

.skeleton-track-grid-title {
    height: 1rem;
    width: 80%;
    margin-bottom: 8px;
}

.skeleton-track-grid-artist {
    height: 0.875rem;
    width: 60%;
}

/* ============================================
   SKELETON ARTIST CARD
   ============================================ */

.skeleton-artist-card {
    background: var(--music-bg-card);
    border: 1px solid var(--music-border);
    border-radius: var(--music-radius);
    padding: var(--music-spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.skeleton-artist-avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    margin-bottom: var(--music-spacing-md);
}

.skeleton-artist-name {
    height: 1.25rem;
    width: 70%;
    margin-bottom: 8px;
}

.skeleton-artist-stats {
    height: 0.875rem;
    width: 50%;
}

/* ============================================
   SKELETON ALBUM CARD
   ============================================ */

.skeleton-album-card {
    background: var(--music-bg-card);
    border: 1px solid var(--music-border);
    border-radius: var(--music-radius);
    padding: var(--music-spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.skeleton-album-cover {
    width: 120px;
    height: 120px;
    border-radius: var(--music-radius);
    margin-bottom: var(--music-spacing-md);
}

.skeleton-album-name {
    height: 1.25rem;
    width: 80%;
    margin-bottom: 8px;
}

.skeleton-album-artist {
    height: 0.875rem;
    width: 60%;
}

/* ============================================
   SKELETON PLAYLIST CARD
   ============================================ */

.skeleton-playlist-card {
    background: var(--music-bg-card);
    border: 1px solid var(--music-border);
    border-radius: var(--music-radius);
    padding: var(--music-spacing-lg);
}

.skeleton-playlist-header {
    display: flex;
    gap: var(--music-spacing-md);
    margin-bottom: var(--music-spacing-lg);
}

.skeleton-playlist-cover {
    width: 80px;
    height: 80px;
    flex-shrink: 0;
}

.skeleton-playlist-info {
    flex: 1;
}

.skeleton-playlist-name {
    height: 1.5rem;
    width: 60%;
    margin-bottom: 8px;
}

.skeleton-playlist-description {
    height: 0.875rem;
    width: 80%;
    margin-bottom: 8px;
}

.skeleton-playlist-stats {
    height: 0.75rem;
    width: 40%;
}

.skeleton-playlist-tracks {
    display: flex;
    flex-direction: column;
    gap: var(--music-spacing-sm);
}

/* ============================================
   SKELETON SIDEBAR
   ============================================ */

.skeleton-sidebar-section {
    margin-bottom: var(--music-spacing-xl);
}

.skeleton-sidebar-title {
    height: 1.25rem;
    width: 60%;
    margin-bottom: var(--music-spacing-md);
}

.skeleton-sidebar-item {
    height: 40px;
    margin-bottom: var(--music-spacing-sm);
    border-radius: var(--music-radius);
}

/* ============================================
   SKELETON PLAYER
   ============================================ */

.skeleton-player {
    background: var(--music-bg-secondary);
    border-top: 1px solid var(--music-border);
    padding: var(--music-spacing-md);
    display: flex;
    align-items: center;
    gap: var(--music-spacing-lg);
}

.skeleton-player-cover {
    width: 56px;
    height: 56px;
    flex-shrink: 0;
}

.skeleton-player-info {
    flex: 1;
    min-width: 0;
}

.skeleton-player-title {
    height: 1rem;
    width: 60%;
    margin-bottom: 6px;
}

.skeleton-player-artist {
    height: 0.875rem;
    width: 40%;
}

.skeleton-player-controls {
    display: flex;
    gap: var(--music-spacing-sm);
}

.skeleton-player-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

/* ============================================
   SKELETON HEADER
   ============================================ */

.skeleton-header {
    display: flex;
    gap: var(--music-spacing-md);
    margin-bottom: var(--music-spacing-lg);
}

.skeleton-search {
    flex: 1;
    height: 40px;
}

.skeleton-button {
    width: 100px;
    height: 40px;
}

/* ============================================
   SKELETON ALPHABET NAV
   ============================================ */

.skeleton-alphabet-nav {
    display: flex;
    gap: var(--music-spacing-xs);
    flex-wrap: wrap;
    margin-bottom: var(--music-spacing-lg);
    padding: var(--music-spacing-md);
    background: var(--music-bg-secondary);
    border-radius: var(--music-radius);
}

.skeleton-alphabet-btn {
    width: 32px;
    height: 32px;
}

/* ============================================
   SKELETON LOADING CONTAINER
   ============================================ */

.skeleton-loading-container {
    padding: var(--music-spacing-xl);
}

.skeleton-loading-header {
    margin-bottom: var(--music-spacing-xl);
}

.skeleton-loading-content {
    display: flex;
    flex-direction: column;
    gap: var(--music-spacing-lg);
}

/* ============================================
   SKELETON STATES
   ============================================ */

.skeleton-fade-in {
    animation: fadeIn 0.3s ease-in-out;
}

.skeleton-pulse {
    animation: pulse 1.5s ease-in-out infinite;
}

/* ============================================
   SKELETON UTILITIES
   ============================================ */

.skeleton-container {
    width: 100%;
}

.skeleton-row {
    display: flex;
    gap: var(--music-spacing-md);
    margin-bottom: var(--music-spacing-md);
}

.skeleton-col {
    flex: 1;
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
    .skeleton-track-card {
        padding: var(--music-spacing-sm);
    }
    
    .skeleton-track-cover {
        width: 48px;
        height: 48px;
    }
    
    .skeleton-tracks-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: var(--music-spacing-sm);
    }
    
    .skeleton-artist-avatar,
    .skeleton-album-cover {
        width: 100px;
        height: 100px;
    }
}

@media (max-width: 480px) {
    .skeleton-tracks-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }
    
    .skeleton-player {
        flex-wrap: wrap;
    }
    
    .skeleton-player-controls {
        width: 100%;
        justify-content: center;
    }
}