/**
 * 图片懒加载样式
 * 提供加载状态的视觉反馈
 */

/* 懒加载图片基础样式 */
.lazy-image {
    transition: opacity 0.3s ease, filter 0.3s ease;
}

/* 加载中状态 - 优化的shimmer效果 */
.lazy-image.lazy-loading {
    opacity: 0.7;
    position: relative;
    background: var(--bg-glass);
    overflow: hidden;
}

.lazy-image.lazy-loading::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    animation: shimmer 1.5s ease-in-out infinite;
}

/* 深色模式下的加载状态 */
.theme-dark .lazy-image.lazy-loading::before {
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
}

/* 加载完成状态 */
.lazy-image.lazy-loaded {
    opacity: 1;
    filter: none;
}

/* 加载失败状态 */
.lazy-image.lazy-error {
    opacity: 0.5;
    filter: grayscale(100%);
    background: var(--bg-glass);
    border: 2px dashed var(--border-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100px;
    position: relative;
}

.lazy-image.lazy-error::after {
    content: '🖼️';
    font-size: 2rem;
    color: var(--text-muted);
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}


/* 图片容器样式优化 */
.lazy-image-container {
    position: relative;
    overflow: hidden;
    background: var(--bg-glass);
    border-radius: 8px;
}

.lazy-image-container .lazy-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 网站图标懒加载样式 */
.website-icon.lazy-image {
    width: 20px;
    height: 20px;
    border-radius: 4px;
    background: var(--bg-glass);
}

.website-icon.lazy-loading {
    position: relative;
    overflow: hidden;
}

.website-icon.lazy-loading::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    animation: shimmer 1s ease-in-out infinite;
}

/* 卡片图片懒加载样式 */
.link-card .lazy-image {
    border-radius: 8px;
    background: var(--bg-glass);
}

.link-card .lazy-loading {
    min-height: 200px;
    position: relative;
    overflow: hidden;
    background: var(--bg-glass);
}

.link-card .lazy-loading::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    animation: shimmer 1.5s ease-in-out infinite;
}

/* 响应式图片懒加载 */
@media (max-width: 768px) {
    .lazy-image.lazy-loading {
        animation-duration: 1s; /* 移动端加快动画速度 */
    }
    
    .link-card .lazy-loading {
        min-height: 150px;
    }
}

/* 减少动画对性能的影响 */
@media (prefers-reduced-motion: reduce) {
    .lazy-image,
    .lazy-image.lazy-loading,
    .lazy-image.lazy-loaded {
        transition: none;
        animation: none;
    }
    
    .lazy-image.lazy-loading {
        background: var(--bg-glass);
    }
}

/* 打印样式 */
@media print {
    .lazy-image.lazy-loading {
        opacity: 1;
        filter: none;
        background: none;
        animation: none;
    }
}