/* 基础样式 */
        .image-nav {
            max-width: 1200px;
            margin: 2rem auto;
            padding: 1rem;
        }

        /* 导航容器 */
        .nav-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 1.5rem;
            padding: 1rem;
        }

        /* 单个导航项 */
        .nav-item {
            position: relative;
            border-radius: 12px;
            overflow: hidden;
            transition: transform 0.3s ease;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }

        /* 悬停效果 */
        .nav-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 15px rgba(0, 0, 0, 0.2);
        }

        /* 图片容器 */
        .nav-image {
            position: relative;
            height: 220px;
            overflow: hidden;
        }

        /* 图片样式 */
        .nav-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }

        .nav-item:hover .nav-image img {
            transform: scale(1.05);
        }

        /* 文字内容 */
        .nav-content {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            padding: 1.5rem;
            background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
            color: white;
            z-index: 1;
        }

        /* 标题样式 */
        .nav-title {
            font-size: 1.4rem;
            margin-bottom: 0.5rem;
            font-weight: 600;
            opacity: 0.95;
        }

        /* 描述文字 */
        .nav-description {
            font-size: 0.95rem;
            opacity: 0.9;
            line-height: 1.5;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }

        /* 悬停显示描述 */
        .nav-item:hover .nav-description {
            max-height: 100px;
        }

        /* 链接覆盖层 */
        .nav-link {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 2;
            text-indent: -9999px;
        }

        /* 响应式设计 */
        @media (max-width: 768px) {
            .nav-grid {
                gap: 1rem;
            }
            
            .nav-image {
                height: 180px;
            }
            
            .nav-title {
                font-size: 1.2rem;
            }
            
            .nav-content {
                padding: 1rem;
            }
        }

        /* 装饰元素 */
        .nav-item::after {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.3);
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .nav-item:hover::after {
            opacity: 1;
        }