/* 懒加载样式 */
.lazy-load {
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
    background-color: #f0f0f0;
}

.lazy-load.lazy-loading {
    opacity: 0.5;
}

.lazy-load.lazy-loaded {
    opacity: 1;
}

.lazy-load.lazy-error {
    opacity: 0.6;
}

/* 加载占位符动画 */
.lazy-load:not(.lazy-loaded):not(.lazy-error) {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: lazy-loading 1.5s infinite;
}

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

/* 响应式图片 */
.lazy-load {
    max-width: 100%;
    height: auto;
}

/* 特定尺寸的占位符 */
.lazy-load.small-placeholder {
    min-height: 80px;
}

.lazy-load.medium-placeholder {
    min-height: 200px;
}

.lazy-load.large-placeholder {
    min-height: 300px;
}