/* 懒加载相关样式 */
.lazy-loading {
    opacity: 0.3;
    transition: opacity 0.3s ease;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading-shimmer 1.5s infinite;
}

.lazy-loaded {
    opacity: 1;
    animation: fadeIn 0.5s ease;
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 图片懒加载占位符 */
img.lazy-loading {
    min-height: 100px;
    background: #f5f5f5;
    border-radius: 4px;
}

/* 背景图片懒加载 */
.bgo.lazy-loading {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%) !important;
}

/* 图标懒加载 */
i.lazy-loading {
    display: inline-block;
    width: 1em;
    height: 1em;
    background: #ddd;
    border-radius: 2px;
}

/* 暗色主题适配 */
[data-theme="dark"] .lazy-loading {
    background: linear-gradient(90deg, #2a2a2a 25%, #3a3a3a 50%, #2a2a2a 75%);
    background-size: 200% 100%;
}

[data-theme="dark"] img.lazy-loading {
    background: #2a2a2a;
}

[data-theme="dark"] i.lazy-loading {
    background: #3a3a3a;
}

/* 性能优化：减少重绘 */
.lazy-loading * {
    visibility: hidden;
}

.lazy-loaded * {
    visibility: visible;
}

/* 打印样式优化 */
@media print {
    .lazy-loading,
    .lazy-loaded {
        opacity: 1 !important;
        animation: none !important;
        background: none !important;
    }
}