/* 优化版三图轮播样式 - 针对低性能服务器优化 */

.optimized-carousel-wrapper {
    position: relative;
    width: 100%;
    max-width: 1500px;
    margin: 40px auto;
    overflow: hidden;
    padding: 0 60px;
    box-sizing: border-box;
}

/* 轮播轨道 */
.optimized-carousel-track {
    display: flex;
    justify-content: space-between;
    gap: 20px;
}

.optimized-slide {
    flex: 0 0 calc(33.333% - 14px);
    position: relative;
    transition: none;
}

.optimized-image {
    width: 100%;
    height: auto;
    aspect-ratio: 1280 / 1707;
    object-fit: cover;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: all 0.3s ease;
    max-height: 600px;
    display: none; /* 默认隐藏，等待加载完成 */
}

.optimized-image:hover {
    transform: scale(1.02);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

/* 图片占位符 */
.image-placeholder {
    width: 100%;
    height: 500px;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.image-placeholder.load-error {
    background: linear-gradient(135deg, #ffebee 0%, #ffcdd2 100%);
}

.error-icon {
    font-size: 48px;
    margin-bottom: 10px;
}

.error-text {
    font-size: 16px;
    color: #666;
}

/* 导航按钮 */
.optimized-button {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 250px;
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: bold;
    transition: all 0.3s ease;
    z-index: 10;
    border-radius: 4px;
}

.optimized-button:hover {
    background-color: rgba(0, 0, 0, 0.9);
    transform: translateY(-50%) scale(1.05);
}

.optimized-button.prev {
    left: 0;
}

.optimized-button.next {
    right: 0;
}

/* 错误界面 */
.carousel-error {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 50px 20px;
    text-align: center;
    color: #666;
}

.error-title {
    font-size: 24px;
    font-weight: bold;
    margin: 20px 0 10px 0;
}

.error-message {
    font-size: 16px;
    margin-bottom: 20px;
    max-width: 400px;
}

.retry-button {
    padding: 12px 24px;
    background-color: #333;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s ease;
}

.retry-button:hover {
    background-color: #555;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .optimized-carousel-wrapper {
        padding: 0 40px;
        margin: 30px auto;
    }
    
    .optimized-image {
        height: 350px; /* 平板端按照规范调整为350px */
        max-height: 350px;
    }
    
    .image-placeholder {
        height: 350px;
    }
    
    .optimized-button {
        width: 40px;
        height: 175px; /* 按钮高度为图片的一半 */
        font-size: 20px;
    }
    
    .optimized-button.prev {
        left: 25px;
    }
    
    .optimized-button.next {
        right: 25px;
    }
}

@media (max-width: 480px) {
    .optimized-carousel-wrapper {
        padding: 0 20px; /* 减少边距以便更好地利用屏幕空间 */
        margin: 20px auto;
    }
    
    .optimized-slide {
        flex: 0 0 calc(33.333% - 6px); /* 减少间距 */
    }
    
    .optimized-image {
        height: 250px; /* 手机端按照规范调整为250px */
        max-height: 250px;
    }
    
    .image-placeholder {
        height: 250px;
    }
    
    .optimized-button {
        width: 35px;
        height: 125px; /* 按钮高度为图片的一半 */
        font-size: 18px;
    }
    
    .optimized-button.prev {
        left: 10px; /* 减少与边缘的距离 */
    }
    
    .optimized-button.next {
        right: 10px; /* 减少与边缘的距离 */
    }
    
    /* 在极小屏幕上，考虑单列显示 */
    @media (max-width: 375px) {
        .optimized-carousel-track {
            flex-direction: column;
            gap: 15px;
        }
        
        .optimized-slide {
            flex: 0 0 100%;
        }
        
        .optimized-button {
            display: none; /* 在单列模式下隐藏按钮 */
        }
    }
}

/* 触摸设备优化 */
@media (hover: none) and (pointer: coarse) {
    .optimized-image:hover {
        transform: none;
    }
    
    .optimized-button {
        width: 45px;
        height: 200px;
    }
    
    .optimized-button:active {
        background-color: rgba(0, 0, 0, 0.9);
        transform: translateY(-50%) scale(0.95);
    }
}

/* 无障碍访问 */
@media (prefers-reduced-motion: reduce) {
    .optimized-slide,
    .optimized-image,
    .optimized-button {
        transition: none;
        animation: none;
    }
    
    .optimized-image:hover {
        transform: none;
    }
}

/* 高对比度模式 */
@media (prefers-contrast: more) {
    .optimized-button {
        border: 2px solid white;
        background-color: rgba(0, 0, 0, 0.9);
    }
}