/**
 * Lazy Loading CSS Styles
 * Provides smooth loading transitions and placeholder styles
 */

/* Lazy loading states */
.lazy-loading {
    opacity: 0.6;
    transition: opacity 0.3s ease-in-out;
    background-color: #f8f9fa;
    background-image: linear-gradient(45deg, #f8f9fa 25%, transparent 25%), 
                      linear-gradient(-45deg, #f8f9fa 25%, transparent 25%), 
                      linear-gradient(45deg, transparent 75%, #f8f9fa 75%), 
                      linear-gradient(-45deg, transparent 75%, #f8f9fa 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    animation: lazy-loading-shimmer 1.5s ease-in-out infinite;
}

.lazy-loaded {
    opacity: 1;
    transition: opacity 0.3s ease-in-out;
}

.lazy-error {
    opacity: 0.8;
    background-color: #f8d7da;
    border: 1px solid #f5c6cb;
}

/* Background lazy loading states */
.bg-lazy-loading {
    background-color: #f8f9fa;
    background-image: linear-gradient(45deg, #f8f9fa 25%, transparent 25%), 
                      linear-gradient(-45deg, #f8f9fa 25%, transparent 25%), 
                      linear-gradient(45deg, transparent 75%, #f8f9fa 75%), 
                      linear-gradient(-45deg, transparent 75%, #f8f9fa 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    animation: lazy-loading-shimmer 1.5s ease-in-out infinite;
}

.bg-lazy-loaded {
    transition: background-image 0.3s ease-in-out;
}

/* Shimmer animation */
@keyframes lazy-loading-shimmer {
    0% {
        background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    }
    100% {
        background-position: 20px 20px, 20px 30px, 30px 10px, 10px 20px;
    }
}

/* Image placeholder styles */
.image-placeholder {
    background-color: #f8f9fa;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #6c757d;
    font-size: 14px;
    min-height: 200px;
    border: 2px dashed #dee2e6;
    border-radius: 8px;
}

.image-placeholder::before {
    content: "📷";
    font-size: 24px;
    margin-right: 8px;
}

/* Responsive image styles */
.responsive-image {
    max-width: 100%;
    height: auto;
    display: block;
}

.responsive-image img {
    width: 100%;
    height: auto;
    display: block;
}

/* Picture element styles */
picture {
    display: block;
    width: 100%;
}

picture img {
    width: 100%;
    height: auto;
    display: block;
}

/* Card image lazy loading */
.card-img-top.lazy-loading {
    min-height: 200px;
    background-color: #f8f9fa;
}

.card-img-top.lazy-loaded {
    min-height: auto;
}

/* Gallery lazy loading */
.gallery-item.lazy-loading {
    min-height: 300px;
    background-color: #f8f9fa;
}

.gallery-item.lazy-loaded {
    min-height: auto;
}

/* Profile image lazy loading */
.profile-image.lazy-loading {
    border-radius: 50%;
    background-color: #f8f9fa;
}

.profile-image.lazy-loaded {
    border-radius: 50%;
}

/* Thumbnail lazy loading */
.thumbnail.lazy-loading {
    background-color: #f8f9fa;
    border: 1px solid #dee2e6;
}

.thumbnail.lazy-loaded {
    border: 1px solid #dee2e6;
}

/* Hero section lazy loading */
.hero-image.lazy-loading {
    min-height: 400px;
    background-color: #f8f9fa;
}

.hero-image.lazy-loaded {
    min-height: auto;
}

/* Loading spinner for images */
.image-loading-spinner {
    position: relative;
}

.image-loading-spinner::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid #f3f3f3;
    border-top: 2px solid #007bff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Fade in animation for loaded images */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.lazy-loaded {
    animation: fadeIn 0.5s ease-in-out;
}

/* Blur to clear effect */
.lazy-loading {
    filter: blur(5px);
    transform: scale(1.05);
}

.lazy-loaded {
    filter: blur(0);
    transform: scale(1);
    transition: filter 0.3s ease-in-out, transform 0.3s ease-in-out;
}

/* Mobile optimizations */
@media (max-width: 768px) {
    .lazy-loading {
        background-size: 15px 15px;
    }
    
    .image-placeholder {
        min-height: 150px;
        font-size: 12px;
    }
    
    .card-img-top.lazy-loading {
        min-height: 150px;
    }
    
    .gallery-item.lazy-loading {
        min-height: 200px;
    }
}

/* High DPI displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .lazy-loading {
        background-size: 10px 10px;
    }
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
    .lazy-loading,
    .lazy-loaded,
    .bg-lazy-loading,
    .bg-lazy-loaded {
        animation: none;
        transition: none;
    }
    
    .lazy-loading {
        filter: none;
        transform: none;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    .lazy-loading,
    .bg-lazy-loading {
        background-color: #343a40;
        background-image: linear-gradient(45deg, #343a40 25%, transparent 25%), 
                          linear-gradient(-45deg, #343a40 25%, transparent 25%), 
                          linear-gradient(45deg, transparent 75%, #343a40 75%), 
                          linear-gradient(-45deg, transparent 75%, #343a40 75%);
    }
    
    .image-placeholder {
        background-color: #343a40;
        color: #adb5bd;
        border-color: #495057;
    }
    
    .lazy-error {
        background-color: #721c24;
        border-color: #f5c6cb;
    }
}