/**
 * 图片懒加载样式
 * 包含加载状态、错误状态、动画效果
 */

/* ========== 基础样式 ========== */

/* 懒加载图片容器 */
.lazy-image {
    position: relative;
    background-color: #f5f5f5;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

/* 加载中状态 */
.lazy-image.lazy-loading {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 2s infinite;
}

/* 加载完成状态 */
.lazy-image.lazy-loaded {
    background: transparent;
}

/* 加载失败状态 */
.lazy-image.lazy-error {
    background-color: #fafafa;
    border: 1px dashed #ddd;
}

/* ========== 动画效果 ========== */

/* 闪烁动画（加载中） */
@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

/* 淡入动画 */
.lazy-image.fade-in {
    opacity: 0;
    transition: opacity 0.3s ease-in;
}

.lazy-image.fade-in.lazy-loaded {
    opacity: 1;
}

/* 缩放动画 */
.lazy-image.zoom-in {
    transform: scale(0.95);
    transition: transform 0.3s ease-out, opacity 0.3s ease-in;
    opacity: 0;
}

.lazy-image.zoom-in.lazy-loaded {
    transform: scale(1);
    opacity: 1;
}

/* 模糊到清晰 */
.lazy-image.blur-in {
    filter: blur(10px);
    transition: filter 0.3s ease-out;
}

.lazy-image.blur-in.lazy-loaded {
    filter: blur(0);
}

/* ========== 占位符样式 ========== */

/* 占位符图片 */
.lazy-image img[src*="placeholder"] {
    opacity: 0.6;
    filter: grayscale(100%);
}

/* 错误图片样式 */
.lazy-image.lazy-error img {
    opacity: 0.5;
    filter: grayscale(100%);
}

/* ========== 加载指示器 ========== */

/* 加载中旋转图标 */
.lazy-image.lazy-loading::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 40px;
    height: 40px;
    margin: -20px 0 0 -20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #D4AF37;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    z-index: 1;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 错误图标 */
.lazy-image.lazy-error::after {
    content: '⚠️';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 32px;
    opacity: 0.5;
    z-index: 1;
}

/* ========== 响应式优化 ========== */

/* 确保图片不超出容器 */
.lazy-image img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* 保持宽高比 */
.lazy-image.aspect-ratio-16-9 {
    aspect-ratio: 16 / 9;
}

.lazy-image.aspect-ratio-4-3 {
    aspect-ratio: 4 / 3;
}

.lazy-image.aspect-ratio-1-1 {
    aspect-ratio: 1 / 1;
}

/* ========== 产品图片特定样式 ========== */

/* 产品列表图片 */
.product-item-img .lazy-image {
    border-radius: 8px;
    overflow: hidden;
}

/* 产品详情大图 */
.product-image-wrapper .lazy-image {
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* 缩略图 */
.thumbnail-item.lazy-image {
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.thumbnail-item.lazy-image:hover {
    transform: scale(1.05);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

/* ========== 性能优化 ========== */

/* 使用 GPU 加速 */
.lazy-image {
    will-change: opacity, transform;
    transform: translateZ(0);
    backface-visibility: hidden;
}

/* 禁用图片拖拽 */
.lazy-image img {
    -webkit-user-drag: none;
    -khtml-user-drag: none;
    -moz-user-drag: none;
    -o-user-drag: none;
    user-drag: none;
}

/* ========== 移动端优化 ========== */

@media (max-width: 768px) {
    /* 减小加载指示器大小 */
    .lazy-image.lazy-loading::before {
        width: 30px;
        height: 30px;
        margin: -15px 0 0 -15px;
        border-width: 2px;
    }

    /* 减小错误图标大小 */
    .lazy-image.lazy-error::after {
        font-size: 24px;
    }
}

/* ========== 打印样式 ========== */

@media print {
    /* 打印时显示所有图片 */
    .lazy-image.lazy-loading::before,
    .lazy-image.lazy-error::after {
        display: none;
    }

    .lazy-image {
        background: none !important;
        animation: none !important;
    }
}

/* ========== 无障碍优化 ========== */

/* 屏幕阅读器提示 */
.lazy-image[aria-busy="true"]::before {
    content: attr(aria-label);
    position: absolute;
    left: -9999px;
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
    .lazy-image.lazy-error {
        border: 2px solid #000;
    }
}

/* 减少动画（用户偏好） */
@media (prefers-reduced-motion: reduce) {
    .lazy-image,
    .lazy-image * {
        animation: none !important;
        transition: none !important;
    }
}

/* ========== 深色模式支持 ========== */

@media (prefers-color-scheme: dark) {
    .lazy-image {
        background-color: #2a2a2a;
    }

    .lazy-image.lazy-loading {
        background: linear-gradient(90deg, #2a2a2a 25%, #3a3a3a 50%, #2a2a2a 75%);
        background-size: 200% 100%;
    }

    .lazy-image.lazy-error {
        background-color: #1a1a1a;
        border-color: #444;
    }

    .lazy-image.lazy-loading::before {
        border-color: #444;
        border-top-color: #D4AF37;
    }
}

/* ========== 特殊效果 ========== */

/* 珠宝产品专用 - 金色边框 */
.lazy-image.jewelry-product {
    border: 2px solid transparent;
    background-clip: padding-box;
    position: relative;
}

.lazy-image.jewelry-product::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(135deg, #D4AF37, #B8860B);
    border-radius: inherit;
    z-index: -1;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lazy-image.jewelry-product.lazy-loaded::before {
    opacity: 1;
}

/* 悬停效果 */
.lazy-image.hover-zoom {
    overflow: hidden;
}

.lazy-image.hover-zoom img {
    transition: transform 0.3s ease;
}

.lazy-image.hover-zoom:hover img {
    transform: scale(1.1);
}

/* ========== 工具类 ========== */

/* 圆形图片 */
.lazy-image.rounded-full {
    border-radius: 50%;
    overflow: hidden;
}

/* 圆角图片 */
.lazy-image.rounded {
    border-radius: 8px;
    overflow: hidden;
}

/* 阴影效果 */
.lazy-image.shadow {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.lazy-image.shadow-lg {
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
}

/* 边框 */
.lazy-image.bordered {
    border: 1px solid #e0e0e0;
}

/* 全宽图片 */
.lazy-image.full-width {
    width: 100%;
}

/* 固定高度 */
.lazy-image.fixed-height {
    height: 300px;
    object-fit: cover;
}