/* 图片基础样式 */
img.site-icon,
img.ranking-icon,
img.mobile-ranking-icon,
.article-thumb img,
img.partner-banner-img,
.content-banner-card img,
.hot-article-thumb img,
.mobile-hot-article-thumb img {
    display: block;
    background: #f5f5f5;
}

/* 未加载状态 - 骨架屏闪动动画 */
img.site-icon:not(.loaded),
img.ranking-icon:not(.loaded),
img.mobile-ranking-icon:not(.loaded),
.article-thumb img:not(.loaded),
img.partner-banner-img:not(.loaded),
.content-banner-card img:not(.loaded),
.hot-article-thumb img:not(.loaded),
.mobile-hot-article-thumb img:not(.loaded) {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s ease-in-out infinite;
    opacity: 0.5;
}

/* 加载完成状态 - 淡入显示 */
img.site-icon.loaded,
img.ranking-icon.loaded,
img.mobile-ranking-icon.loaded,
.article-thumb img.loaded,
img.partner-banner-img.loaded,
.content-banner-card img.loaded,
.hot-article-thumb img.loaded,
.mobile-hot-article-thumb img.loaded {
    animation: fadeIn 0.3s ease-in;
    opacity: 1;
}

/* 骨架屏闪动动画 */
@keyframes shimmer {
    0% {
        background-position: 200% 0;
    }

    100% {
        background-position: -200% 0;
    }
}

/* 淡入动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* 文章缩略图容器 */
.article-thumb,
.hot-article-thumb,
.mobile-hot-article-thumb {
    position: relative;
    overflow: hidden;
    background: #f5f5f5;
    border-radius: 8px;
}

.article-thumb img,
.hot-article-thumb img,
.mobile-hot-article-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 站点图标样式 */
img.site-icon {
    border-radius: 8px;
    width: 48px;
    height: 48px;
    object-fit: cover;
}

/* 排行榜图标特殊尺寸 */
img.ranking-icon {
    border-radius: 8px;
    width: 40px;
    height: 40px;
    object-fit: cover;
}

img.mobile-ranking-icon {
    border-radius: 8px;
    width: 36px;
    height: 36px;
    object-fit: cover;
}

/* 性能优化 - 使用GPU加速 */
img.site-icon:not(.loaded),
img.ranking-icon:not(.loaded),
img.mobile-ranking-icon:not(.loaded),
.article-thumb img:not(.loaded),
img.partner-banner-img:not(.loaded),
.content-banner-card img:not(.loaded),
.hot-article-thumb img:not(.loaded),
.mobile-hot-article-thumb img:not(.loaded) {
    will-change: filter, transform, opacity;
}

/* 加载完成后移除will-change */
img.site-icon.loaded,
img.ranking-icon.loaded,
img.mobile-ranking-icon.loaded,
.article-thumb img.loaded,
img.partner-banner-img.loaded,
.content-banner-card img.loaded,
.hot-article-thumb img.loaded,
.mobile-hot-article-thumb img.loaded {
    will-change: auto;
}

/* 尊重用户偏好 - 禁用动画 */
@media (prefers-reduced-motion: reduce) {

    img.site-icon,
    img.ranking-icon,
    img.mobile-ranking-icon,
    .article-thumb img,
    img.partner-banner-img,
    .content-banner-card img,
    .hot-article-thumb img,
    .mobile-hot-article-thumb img {
        transition: none !important;
        filter: none !important;
        transform: none !important;
    }

    img.site-icon:not(.loaded),
    img.ranking-icon:not(.loaded),
    img.mobile-ranking-icon:not(.loaded),
    .article-thumb img:not(.loaded),
    img.partner-banner-img:not(.loaded),
    .content-banner-card img:not(.loaded),
    .hot-article-thumb img:not(.loaded),
    .mobile-hot-article-thumb img:not(.loaded) {
        opacity: 0.8;
    }
}

/* 移动端优化 - 减少模糊程度 */
@media (max-width: 768px) {

    img.site-icon:not(.loaded),
    img.ranking-icon:not(.loaded),
    img.mobile-ranking-icon:not(.loaded),
    .article-thumb img:not(.loaded),
    img.partner-banner-img:not(.loaded),
    .content-banner-card img:not(.loaded),
    .hot-article-thumb img:not(.loaded),
    .mobile-hot-article-thumb img:not(.loaded) {
        filter: blur(4px) grayscale(80%);
    }
}