/**
 * 图片懒加载样式
 * 配合 LazyLoader 使用
 */

/* 懒加载图片基础样式 */
.lazy-img,
[data-src],
[data-lazy-src] {
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}

/* 加载中状态 */
.lazy-loading {
    position: relative;
    background: linear-gradient(90deg,
            var(--color-bg-secondary, #f0f0f0) 25%,
            var(--color-bg-tertiary, #e0e0e0) 50%,
            var(--color-bg-secondary, #f0f0f0) 75%);
    background-size: 200% 100%;
    animation: lazy-shimmer 1.5s infinite;
}

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

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

/* 加载完成状态 */
.lazy-loaded {
    opacity: 1;
}

/* 加载失败状态 */
.lazy-error {
    opacity: 0.5;
    filter: grayscale(100%);
}

/* 图片容器占位 - 保持宽高比 */
.lazy-img-container {
    position: relative;
    overflow: hidden;
    background-color: var(--color-bg-secondary, #f0f0f0);
}

/* 16:9 宽高比占位 */
.lazy-img-container--16-9 {
    padding-bottom: 56.25%;
}

/* 4:3 宽高比占位 */
.lazy-img-container--4-3 {
    padding-bottom: 75%;
}

/* 1:1 正方形占位 */
.lazy-img-container--square {
    padding-bottom: 100%;
}

/* 容器内图片样式 */
.lazy-img-container img,
.lazy-img-container .lazy-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 加载中覆盖层（可选） */
.lazy-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-bg-secondary, rgba(0, 0, 0, 0.1));
    opacity: 1;
    transition: opacity 0.3s ease;
}

.lazy-loaded+.lazy-overlay,
.lazy-loaded~.lazy-overlay {
    opacity: 0;
    pointer-events: none;
}

/* 加载中旋转图标 */
.lazy-spinner {
    width: 24px;
    height: 24px;
    border: 2px solid var(--color-border, #ddd);
    border-top-color: var(--color-primary, #0078d4);
    border-radius: 50%;
    animation: lazy-spin 0.8s linear infinite;
}

@keyframes lazy-spin {
    to {
        transform: rotate(360deg);
    }
}

/* 渐入动画 */
.lazy-fade-in {
    animation: lazy-fade-in 0.3s ease-out forwards;
}

@keyframes lazy-fade-in {
    from {
        opacity: 0;
        transform: scale(0.95);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}