/**
 * Mgwalk Blog Extension - Lazy Loading CSS
 *
 * @category  Mgwalk
 * @package   Mgwalk_Blog
 * @author    Mgwalk
 * @copyright Copyright (c) 2025 Mgwalk
 * @license   http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

/* Base lazy-load image styles */
.lazy-load {
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
    background-color: #f5f5f5;
    min-height: 200px;
}

/* Loading state */
.lazy-load.lazy-loading {
    opacity: 0.6;
    animation: pulse 1.5s ease-in-out infinite;
}

/* Loaded state */
.lazy-load.lazy-loaded {
    opacity: 1;
    min-height: auto;
}

/* Error state */
.lazy-load.lazy-error {
    opacity: 1;
    background-color: #fee;
    border: 1px solid #fcc;
}

/* Pulse animation for loading */
@keyframes pulse {
    0%, 100% {
        opacity: 0.6;
    }
    50% {
        opacity: 0.8;
    }
}

/* Blur-up effect (low-quality placeholder) */
.lazy-load.blur-up {
    filter: blur(10px);
    transition: filter 0.3s ease-in-out, opacity 0.3s ease-in-out;
}

.lazy-load.blur-up.lazy-loaded {
    filter: blur(0);
}

/* Skeleton loader */
.lazy-load.skeleton {
    background: linear-gradient(
        90deg,
        #f0f0f0 0%,
        #f8f8f8 50%,
        #f0f0f0 100%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
}

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

/* Fade-in animation */
.lazy-load.fade-in {
    animation: fadeIn 0.5s ease-in-out;
}

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

/* Container with aspect ratio placeholder */
.lazy-load-container {
    position: relative;
    overflow: hidden;
    background-color: #f5f5f5;
}

.lazy-load-container::before {
    content: "";
    display: block;
    padding-top: 56.25%; /* 16:9 aspect ratio */
}

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

/* Aspect ratio variations */
.lazy-load-container.aspect-square::before {
    padding-top: 100%; /* 1:1 */
}

.lazy-load-container.aspect-4-3::before {
    padding-top: 75%; /* 4:3 */
}

.lazy-load-container.aspect-3-2::before {
    padding-top: 66.67%; /* 3:2 */
}

.lazy-load-container.aspect-16-9::before {
    padding-top: 56.25%; /* 16:9 */
}

/* Spinner loading indicator */
.lazy-load-container.spinner::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 40px;
    height: 40px;
    margin: -20px 0 0 -20px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #555;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    opacity: 0.5;
    pointer-events: none;
}

.lazy-load-container.spinner .lazy-loaded ~ ::after {
    display: none;
}

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

/* Blog post featured images */
.blog-post-featured-image {
    margin-bottom: 20px;
}

.blog-post-featured-image .lazy-load {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 4px;
}

/* Blog post list images */
.blog-post-list-item .post-image {
    margin-bottom: 15px;
}

.blog-post-list-item .post-image .lazy-load {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 4px;
}

/* Thumbnail images */
.blog-thumbnail .lazy-load {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 4px;
}

/* Author avatar */
.blog-author-avatar .lazy-load {
    border-radius: 50%;
    width: 100px;
    height: 100px;
    object-fit: cover;
}

/* Widget images */
.blog-widget .widget-post-image .lazy-load {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 4px;
}

/* Responsive image adjustments */
@media (max-width: 768px) {
    .lazy-load-container::before {
        padding-top: 75%; /* Adjust aspect ratio for mobile */
    }

    .blog-author-avatar .lazy-load {
        width: 80px;
        height: 80px;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    .lazy-load {
        background-color: #2a2a2a;
    }

    .lazy-load-container {
        background-color: #2a2a2a;
    }

    .lazy-load.skeleton {
        background: linear-gradient(
            90deg,
            #2a2a2a 0%,
            #3a3a3a 50%,
            #2a2a2a 100%
        );
        background-size: 200% 100%;
    }

    .lazy-load-container.spinner::after {
        border-color: #444;
        border-top-color: #aaa;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .lazy-load,
    .lazy-load.blur-up,
    .lazy-load.fade-in {
        animation: none;
        transition: none;
    }

    .lazy-load.skeleton {
        animation: none;
        background: #f0f0f0;
    }

    .lazy-load-container.spinner::after {
        animation: none;
    }
}

/* Print styles */
@media print {
    .lazy-load {
        opacity: 1 !important;
        filter: none !important;
        animation: none !important;
    }

    .lazy-load-container.spinner::after {
        display: none !important;
    }
}