/* Optimización de carga de imágenes */
img {
    transition: opacity 0.3s ease-in-out;
}

img.lazy {
    opacity: 0;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

img.loaded {
    opacity: 1;
    animation: none;
}

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

/* Placeholder para imágenes while loading */
.img-placeholder {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
    border-radius: 4px;
}

/* Optimización para dispositivos móviles */
@media (max-width: 768px) {
    img {
        image-rendering: auto;
        image-rendering: crisp-edges;
        image-rendering: -webkit-optimize-contrast;
    }
}

/* Preload crítico */
.critical-image {
    opacity: 1 !important;
}

/* Mejora visual durante la carga */
.img-fluid {
    height: auto;
    max-width: 100%;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.img-fluid:hover {
    transform: scale(1.02);
}

/* Loading spinner para imágenes grandes */
.image-container {
    position: relative;
}

.image-container::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid #f3f3f3;
    border-top: 2px solid #333;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    opacity: 0;
    transition: opacity 0.3s;
}

.image-container.loading::before {
    opacity: 1;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}