/* Performance CSS Utilities */

/* Optimisation des transformations avec GPU */
.gpu-accelerated {
    transform: translateZ(0);
    will-change: transform;
}

/* Optimisation des animations */
.smooth-animation {
    transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
}

/* Prévention du layout shift */
.aspect-ratio-16-9 {
    aspect-ratio: 16 / 9;
}

.aspect-ratio-1-1 {
    aspect-ratio: 1 / 1;
}

.aspect-ratio-4-3 {
    aspect-ratio: 4 / 3;
}

/* Conteneur pour images lazy */
.lazy-image-container {
    position: relative;
    overflow: hidden;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
}

.lazy-image-container::before {
    content: '';
    display: block;
    padding-top: 56.25%; /* 16:9 ratio par défaut */
}

.lazy-image-container img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Optimisation du scroll */
.scroll-smooth {
    scroll-behavior: smooth;
}

.scroll-optimized {
    -webkit-overflow-scrolling: touch;
    overflow-y: auto;
}

/* Optimisation des fonts */
.font-display-swap {
    font-display: swap;
}

/* Préchargement visuel */
.skeleton-loading {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
}

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

/* Réduction de la complexité visuelle pour les animations */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Optimisation du rendu des backgrounds */
.background-optimized {
    background-attachment: scroll;
    will-change: auto;
}

/* Conteneur pour images critiques */
.critical-image {
    content-visibility: auto;
    contain: layout style paint;
}

/* Optimisation des ombres */
.shadow-optimized {
    filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.1));
}

/* Hide elements before they're loaded */
.defer-load {
    opacity: 0;
    transition: opacity 0.3s ease-in;
}

.defer-load.loaded {
    opacity: 1;
}

/* Prévention du flicker */
.prevent-flicker {
    backface-visibility: hidden;
    perspective: 1000px;
}

/* Optimisation des images de fond */
.bg-image-optimized {
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

/* Conteneur pour contenu au-dessus du fold */
.above-fold {
    contain: layout style;
}

/* Optimisation des grilles */
.grid-optimized {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    contain: layout;
}

/* Responsive images */
.responsive-img {
    width: 100%;
    height: auto;
    display: block;
}

/* Lazy loaded background images */
.lazy-bg {
    background-image: none !important;
    background-color: #f0f0f0;
}

.lazy-bg.loaded {
    background-color: transparent;
}