/* Lazy Loading Styles */

/* Placeholder styling for images before they load */
img[data-src] {
    background: #f0f0f0;
    background-image: linear-gradient(
        90deg,
        #f0f0f0 0%,
        #f8f8f8 20%,
        #f0f0f0 40%,
        #f0f0f0 100%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    min-height: 100px;
    display: block;
}

/* Shimmer effect for loading state */
@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

/* Smooth fade-in effect when image loads */
img.lazy-loaded {
    animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Aspect ratio preservation for images */
.lazy-img-container {
    position: relative;
    overflow: hidden;
    background: #f0f0f0;
}

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

/* Common aspect ratios */
.aspect-16-9 {
    padding-bottom: 56.25%;
}

.aspect-4-3 {
    padding-bottom: 75%;
}

.aspect-1-1 {
    padding-bottom: 100%;
}

.aspect-3-2 {
    padding-bottom: 66.67%;
}

/* Background image lazy loading */
[data-bg] {
    background-color: #f0f0f0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    transition: opacity 0.3s ease-in-out;
}

[data-bg].lazy-loaded {
    animation: fadeIn 0.3s ease-in-out;
}

/* Loading spinner for larger images */
.lazy-loading-spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    display: none;
}

.lazy-img-container.loading .lazy-loading-spinner {
    display: block;
}

.lazy-loading-spinner::after {
    content: '';
    display: block;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 3px solid #f3f3f3;
    border-top-color: #198754;
    animation: spin 1s linear infinite;
}

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

/* Blur-up technique for better perceived performance */
.lazy-blur {
    filter: blur(5px);
    transform: scale(1.02);
    transition: filter 0.3s, transform 0.3s;
}

.lazy-blur.lazy-loaded {
    filter: blur(0);
    transform: scale(1);
}

/* Responsive image placeholder heights */
@media (max-width: 768px) {
    img[data-src] {
        min-height: 80px;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    img[data-src],
    [data-bg],
    .lazy-img-container {
        background-color: #2d3748;
    }
    
    img[data-src] {
        background-image: linear-gradient(
            90deg,
            #2d3748 0%,
            #3d4758 20%,
            #2d3748 40%,
            #2d3748 100%
        );
    }
}