/* ============================================
   CAROUSEL COMPONENT
   ============================================
   
   Système de carrousel moderne pour affichage progressif
   de contenus avec navigation tactile et clavier.
   
   Utilisé pour :
   - Suites de chapitres sur la page de lecture
   - Peut être étendu pour d'autres types de contenus
   
   @version 1.0.0
   @since 2026-01-26
   ============================================ */

/* ============================================
   1. CONTENEUR PRINCIPAL
   ============================================ */
.carousel {
    position: relative;
    width: 100%;
    max-width: 100%;
    margin: var(--spacing-xl) 0 var(--spacing-sm) 0;
    padding: var(--spacing-md) 0;
    overflow: visible;
    outline: none;
}

/* ============================================
   2. VIEWPORT & TRACK
   ============================================ */
.carousel__viewport {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-lg);
    margin: 0 calc(var(--spacing-xl) + 24px);
    touch-action: pan-y pinch-zoom;
}

.carousel__track {
    display: flex;
    gap: var(--spacing-md);
    transition: transform var(--transition-slow) cubic-bezier(0.4, 0, 0.2, 1);
    will-change: transform;
}

/* ============================================
   ITEMS DU CARROUSEL - APPROCHE GÉNÉRIQUE
   ============================================
   Tous les enfants directs du track sont des items.
   Fonctionne avec n'importe quel type de contenu.
   ============================================ */
.carousel__track > * {
    flex: 0 0 100%;
    width: 100%;
    min-width: 100%;
    max-width: 100%;
    opacity: 0.4;
    transform: scale(0.95);
    transition: 
        opacity var(--transition-base),
        transform var(--transition-base);
}

.carousel__track > *[data-carousel-active="true"] {
    opacity: 1;
    transform: scale(1);
}

.carousel__track--grabbing {
    cursor: grabbing;
    transition: none;
}

/* ============================================
   3. SLIDES
   ============================================ */
.carousel__slide {
    flex: 0 0 100%;
    min-width: 100%;
    max-width: 100%;
    opacity: 0.4;
    transform: scale(0.95);
    transition: 
        opacity var(--transition-base),
        transform var(--transition-base);
}

.carousel__slide--active {
    opacity: 1;
    transform: scale(1);
}

.carousel__slide-inner {
    position: relative;
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    height: 100%;
    transition: box-shadow var(--transition-base);
}

.carousel__slide-inner:hover {
    box-shadow: var(--shadow-xl);
}

/* Variantes de slides — bordures colorées selon la hiérarchie */
.carousel__slide--selected .carousel__slide-inner {
    border: 2px solid var(--color-success);
}

.carousel__slide--in-branch .carousel__slide-inner {
    border: 2px solid var(--color-accent-2, #B794F4);
}

.carousel__slide--author-continuation .carousel__slide-inner {
    border: 2px solid var(--color-accent-1, #96D9D7);
}

.carousel__slide--my-sequel .carousel__slide-inner {
    border: 2px solid var(--color-info, #4299e1);
}

.carousel__slide--featured .carousel__slide-inner {
    border: 2px solid var(--color-warning);
}

/* ============================================
   4. BADGES DE VARIANTE
   ============================================ */
.carousel__badge {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    z-index: 10;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    backdrop-filter: blur(8px);
}

.carousel__badge--my-sequel {
    background: rgba(54, 89, 87, 0.9);
    color: var(--color-white);
}

.carousel__badge--author {
    background: rgba(89, 73, 54, 0.9);
    color: var(--color-white);
}

.carousel__badge--selected {
    background: rgba(56, 142, 60, 0.9);
    color: var(--color-white);
}

.carousel__badge--in-branch {
    background: rgba(123, 97, 176, 0.9);
    color: var(--color-white);
}

.carousel__badge--featured {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: var(--color-white);
}

/* ============================================
   5. IMAGE DU SLIDE
   ============================================ */
.carousel__slide-image {
    position: relative;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: var(--color-gray-100);
}

.carousel__slide-image-link {
    display: block;
    width: 100%;
    height: 100%;
}

.carousel__slide-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.carousel__slide-inner:hover .carousel__slide-img {
    transform: scale(1.05);
}

.carousel__slide-img--placeholder {
    object-fit: contain;
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, var(--color-gray-100), var(--color-gray-200));
}

.carousel__ending-badge {
    position: absolute;
    bottom: var(--spacing-sm);
    right: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(0, 0, 0, 0.7);
    color: var(--color-white);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-base);
    backdrop-filter: blur(4px);
}

/* ============================================
   6. CONTENU DU SLIDE
   ============================================ */
.carousel__slide-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    flex: 1;
}

.carousel__slide-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin: 0;
    line-height: var(--line-height-tight);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.carousel__slide-title a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.carousel__slide-title a:hover {
    color: var(--color-primary);
}

.carousel__slide-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: var(--line-height-normal);
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Badge "Proposé par" dans le carousel */
.carousel__proposed-by {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-gray-100);
    border-radius: var(--radius-md);
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    width: fit-content;
    margin-top: var(--spacing-xs);
}

.carousel__proposed-by i {
    color: var(--color-primary);
}

.carousel__proposed-by-link {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: color 0.2s ease;
}

.carousel__proposed-by-link:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

/* ============================================
   7. MÉTADONNÉES (Auteur, Temps de lecture)
   ============================================ */
.carousel__slide-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    margin-top: auto;
    padding-top: var(--spacing-sm);
}

.carousel__slide-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Compat : ancien sélecteur + avatar unifié dans le carousel */
.carousel__slide-author-avatar,
.carousel__slide-author .entity-cell__avatar {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-full);
    object-fit: cover;
    border: 2px solid var(--color-gray-200);
}

.carousel__slide-author-name {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
}

.carousel__slide-readtime {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.carousel__slide-readtime i {
    font-size: 0.65rem;
}

/* ============================================
   8. STATISTIQUES
   ============================================ */
.carousel__slide-stats {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-divider);
}

.carousel__slide-stat {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

.carousel__slide-stat i {
    font-size: 0.7rem;
    color: var(--color-text-muted);
}

.carousel__slide-stat--chosen {
    color: var(--color-success);
}

.carousel__slide-stat--chosen i {
    color: var(--color-success);
}

/* ============================================
   9. ACTIONS
   ============================================ */
.carousel__slide-actions {
    display: flex;
    gap: var(--spacing-sm);
    padding-top: var(--spacing-md);
}

.carousel__slide-actions .btn {
    flex: 1;
    justify-content: center;
}

.carousel__slide-actions .btn--primary {
    background: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    transition: 
        background var(--transition-fast),
        transform var(--transition-fast);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    text-decoration: none;
}

.carousel__slide-actions .btn--primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
}

/* ============================================
   10. NAVIGATION
   ============================================ */
.carousel__nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: 
        background var(--transition-fast),
        border-color var(--transition-fast),
        box-shadow var(--transition-fast),
        transform var(--transition-fast),
        opacity var(--transition-fast);
}

.carousel__nav:hover:not(:disabled) {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
    box-shadow: var(--shadow-lg);
    transform: translateY(-50%) scale(1.05);
}

.carousel__nav:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.carousel__nav--prev {
    left: 0;
}

.carousel__nav--next {
    right: 0;
}

/* ============================================
   11. INDICATEURS (Dots)
   ============================================ */
.carousel__indicators {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-lg);
    padding: var(--spacing-sm) 0;
}

.carousel__indicator {
    width: 8px;
    height: 8px;
    background: var(--color-gray-300);
    border: none;
    border-radius: var(--radius-full);
    padding: 0;
    cursor: pointer;
    transition: 
        width var(--transition-fast),
        background var(--transition-fast),
        transform var(--transition-fast);
}

.carousel__indicator:hover {
    background: var(--color-gray-500);
    transform: scale(1.2);
}

.carousel__indicator--active {
    width: 24px;
    background: var(--color-primary);
}

/* ============================================
   12. ÉTAT VIDE
   ============================================ */
.carousel__empty-state {
    padding: var(--spacing-2xl);
    text-align: center;
}

.carousel__empty-state .empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.carousel__empty-state .empty-state__icon {
    font-size: 3rem;
    color: var(--color-gray-400);
}

.carousel__empty-state .empty-state__title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin: 0;
}

.carousel__empty-state .empty-state__text {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin: 0;
    max-width: 400px;
}

/* ============================================
   13. ÉTATS DE CHARGEMENT (Skeletons)
   ============================================ */
.carousel__slide--skeleton {
    opacity: 1;
}

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

.carousel__skeleton-image {
    aspect-ratio: 16 / 9;
    background: linear-gradient(90deg, 
        var(--color-gray-200) 0%, 
        var(--color-gray-100) 50%, 
        var(--color-gray-200) 100%);
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s ease-in-out infinite;
}

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

.carousel__skeleton-title {
    height: 24px;
    width: 80%;
}

.carousel__skeleton-text {
    height: 16px;
    width: 100%;
}

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

.carousel__skeleton-meta {
    height: 28px;
    width: 120px;
}

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

@keyframes skeleton-pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

/* ============================================
   14. RESPONSIVE DESIGN
   ============================================ */

/* Tablettes */
@media (max-width: 1024px) {
    .carousel__viewport {
        margin: 0 calc(var(--spacing-lg) + 20px);
    }
    
    .carousel__nav {
        width: 40px;
        height: 40px;
        font-size: var(--font-size-sm);
    }
    
    .carousel__slide-content {
        padding: var(--spacing-md);
    }
    
    .carousel__slide-title {
        font-size: var(--font-size-base);
    }
}

/* Mobile */
@media (max-width: 768px) {
    .carousel {
        margin: var(--spacing-lg) 0;
        padding: var(--spacing-sm) 0;
    }
    
    .carousel__viewport {
        margin: 0 var(--spacing-sm);
    }
    
    /* Navigation sur mobile — flèches overlay réduites */
    .carousel__nav {
        width: 32px;
        height: 32px;
        font-size: var(--font-size-xs);
        /* Garder position absolute pour éviter le stacking vertical */
    }

    .carousel__nav:hover:not(:disabled) {
        transform: translateY(-50%) scale(1.05);
    }

    .carousel__viewport {
        margin: 0 calc(var(--spacing-xs) + 32px);
    }

    .carousel__nav--prev {
        left: var(--spacing-xs);
    }

    .carousel__nav--next {
        right: var(--spacing-xs);
    }
    
    /* Variante : navigation cachée au profit des indicateurs */
    .carousel--mobile-nav-bottom {
        display: flex;
        flex-direction: column;
    }
    
    .carousel--mobile-nav-bottom .carousel__viewport {
        order: 1;
        margin: 0;
    }
    
    .carousel--mobile-nav-bottom .carousel__nav {
        display: none;
    }
    
    .carousel--mobile-nav-bottom .carousel__indicators {
        order: 2;
    }
    
    .carousel__slide-content {
        padding: var(--spacing-md);
    }
    
    .carousel__slide-title {
        font-size: var(--font-size-base);
        -webkit-line-clamp: 1;
    }
    
    .carousel__slide-description {
        font-size: var(--font-size-xs);
        -webkit-line-clamp: 2;
    }
    
    .carousel__slide-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
    
    .carousel__slide-stats {
        flex-wrap: wrap;
    }
    
    .carousel__slide-actions .btn--primary {
        padding: var(--spacing-sm);
        font-size: var(--font-size-xs);
    }
    
    .carousel__indicator {
        width: 6px;
        height: 6px;
    }
    
    .carousel__indicator--active {
        width: 18px;
    }
}

/* Très petit écran */
@media (max-width: 480px) {
    .carousel__slide-image {
        aspect-ratio: 4 / 3;
    }
    
    .carousel__badge {
        font-size: 0.65rem;
        padding: 2px var(--spacing-xs);
    }
    
    .carousel__slide-author-avatar {
        width: 24px;
        height: 24px;
    }
    
    .carousel__empty-state {
        padding: var(--spacing-lg);
    }
    
    .carousel__empty-state .empty-state__icon {
        font-size: 2rem;
    }
}

/* ============================================
   15. MOTION PREFERENCES
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    .carousel__track {
        transition: none;
    }
    
    .carousel__slide {
        transition: opacity var(--transition-fast);
        transform: none;
    }
    
    .carousel__slide--active {
        transform: none;
    }
    
    .carousel__slide-img,
    .carousel__nav,
    .carousel__indicator {
        transition: none;
    }
    
    .carousel__skeleton-image,
    .carousel__skeleton-title,
    .carousel__skeleton-text,
    .carousel__skeleton-meta {
        animation: none;
    }
    
    .carousel__slide--skeleton .carousel__slide-inner {
        animation: none;
    }
}

/* ============================================
   16. MODE SOMBRE (si supporté)
   ============================================ */
@media (prefers-color-scheme: dark) {
    .carousel__slide-inner {
        background: var(--color-gray-800);
    }
    
    .carousel__slide-title {
        color: var(--color-gray-100);
    }
    
    .carousel__slide-description {
        color: var(--color-gray-400);
    }
    
    .carousel__nav {
        background: var(--color-gray-800);
        border-color: var(--color-gray-700);
        color: var(--color-gray-100);
    }
    
    .carousel__nav:hover:not(:disabled) {
        background: var(--color-primary);
        border-color: var(--color-primary);
    }
    
    .carousel__indicator {
        background: var(--color-gray-600);
    }
    
    .carousel__indicator:hover {
        background: var(--color-gray-500);
    }
    
    .carousel__slide-stats {
        border-color: var(--color-gray-700);
    }
}

/* ============================================
   17. UTILITIES
   ============================================ */
.carousel.u-hidden,
.carousel__empty-state.u-hidden {
    display: none;
}

.carousel--loading .carousel__nav,
.carousel--loading .carousel__indicators {
    pointer-events: none;
    opacity: 0.5;
}