/* Transitions et animations globales */
:root {
    --transition-speed: 0.3s;
    --transition-timing: cubic-bezier(0.4, 0, 0.2, 1);
}

/* Optimisations générales pour le défilement */
html {
    scroll-behavior: smooth;
}

body {
    overscroll-behavior-y: none;
    -webkit-overflow-scrolling: touch;
}

/* Utiliser transform et opacity qui sont mieux optimisées par le GPU */
.animated-element {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition-speed) var(--transition-timing),
                transform var(--transition-speed) var(--transition-timing);
    will-change: opacity, transform;
}

.animated-element.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Éviter d'animer des propriétés coûteuses comme width, height, top, left */
.card:hover,
.feature-box:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

/* Désactiver les animations pour les personnes qui préfèrent moins de mouvement */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .animated-element {
        opacity: 1;
        transform: none;
    }
}

/* Optimisations spécifiques pour mobile */
@media (max-width: 768px) {
    /* Réduire les animations sur mobile pour économiser des ressources */
    .card,
    .feature-box {
        transition: transform 0.2s var(--transition-timing);
    }
    
    /* Optimiser les images pour le défilement */
    img {
        content-visibility: auto;
    }
}

/* Transitions du header */
.main-header {
    transition: transform var(--transition-speed) var(--transition-timing),
                background-color var(--transition-speed) var(--transition-timing),
                box-shadow var(--transition-speed) var(--transition-timing);
}

.main-header.sticky {
    transform: translateY(0);
}

.main-header.header-hidden {
    transform: translateY(-100%);
}

/* Transitions du menu mobile */
.mobile-menu-toggle {
    transition: transform var(--transition-speed) var(--transition-timing);
}

.menu-open .mobile-menu-toggle {
    transform: rotate(180deg);
}

.main-nav {
    transition: opacity var(--transition-speed) var(--transition-timing),
                transform var(--transition-speed) var(--transition-timing),
                visibility var(--transition-speed) var(--transition-timing);
}

/* Animations des éléments au scroll */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition-speed) var(--transition-timing),
                transform var(--transition-speed) var(--transition-timing);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Transitions des images */
img {
    transition: opacity var(--transition-speed) var(--transition-timing);
}

img[data-src] {
    opacity: 0;
}

img.loaded {
    opacity: 1;
}

/* Transitions des boutons et liens */
.button,
.nav-link {
    transition: color var(--transition-speed) var(--transition-timing),
                background-color var(--transition-speed) var(--transition-timing),
                transform var(--transition-speed) var(--transition-timing);
}

.button:hover,
.nav-link:hover {
    transform: translateY(-2px);
}

/* Transitions des cartes et conteneurs */
.card,
.feature-box {
    transition: transform var(--transition-speed) var(--transition-timing),
                box-shadow var(--transition-speed) var(--transition-timing);
}

.card:hover,
.feature-box:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

/* Optimisations pour mobile */
@media (max-width: 768px) {
    .feature-box,
    .card,
    .service-card {
        transform: none !important;
        transition: none !important;
    }
    
    .fade-in {
        animation: none !important;
        opacity: 1;
        transform: none;
    }
    
    /* Optimisation du défilement sur mobile */
    body {
        -webkit-overflow-scrolling: touch;
        overscroll-behavior-y: none;
    }
    
    /* Désactivation des animations complexes sur mobile */
    .timeline-item,
    .brands-slider,
    .section-header {
        animation: none !important;
        opacity: 1;
        transform: none;
    }
}