/* 基础重置 */
        * {
            margin: 0;
            padding: 0;
            border: 0;
            box-sizing: border-box;
            vertical-align: baseline;
        }
        
        /* 背景层 (z-index: -1) - 设置为最低层 */
        html, body {
            width: 100%;
            min-height: 100vh;
            background-color: rgba(0,0,0,0.09) ; /* 完全透明背景 */
            font-family: 'Arial', 'Microsoft YaHei', sans-serif;
            line-height: 1.5;
            z-index: -1; /* 关键修改：设为负值，确保在最底层 */
        }
        
        /* 页面容器层 (z-index: 1) - 高于背景层 */
        .page-container {
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 10px;
            width: 100%<body>;
            z-index: 1; /* 高于背景层 */
            position: relative;
            background-color: rgba(0,0,0,0.03); /* 极轻微的背景色 */
            margin: 0;
        }
        
        /* 内容盒子层 (z-index: 2) */
        .content-box {
            width: 100%;
            max-width: 1000px;
            background: rgba(0, 0, 0, 0.25);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            border-radius: 16px;
            padding: 30px;
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
            border: 1px solid rgba(0, 0, 0, 0.3);
            margin: 0 auto;
            position: relative;
            overflow: visible;
            z-index: 2;
        }
        
        /* 标题层 (z-index: 3) */
        .main-title {
            font-size: 2.2rem;
            color: #333;
            text-align: center;
            margin-bottom: 20px;
            text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.1);
            font-weight: 600;
            line-height: 1.2;
            position: relative;
            z-index: 3;
        }
        
        /* 副标题层 (z-index: 4) */
        .sub-title {
            font-size: 1.1rem;
            color: rgba(51, 51, 51, 0.9);
            text-align: center;
            margin-bottom: 30px;
            padding: 0 10px;
            position: relative;
            z-index: 4;
        }
        
        /* 图片容器层 (z-index: 5) */
        .image-container {
            display: block;
            width: 100%;
            max-width: 600px;
            margin: 0 auto;
            position: relative;
            z-index: 5;
        }
        
        /* 图片层 (z-index: 6) */
        .feature-image {
            width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
            border: 12px solid transparent;
            background: 
                linear-gradient(white, white) padding-box,
                linear-gradient(135deg, #f5f5f5, #e0e0e0, #f5f5f5) border-box;
            position: relative;
            transition: all 0.3s ease;
            z-index: 6;
        }
        
        /* 图片悬停效果层 (z-index: 7) */
        .feature-image:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
            z-index: 7;
        }
        
        /* 响应式设计（保持不变） */
        @media (max-width: 768px) {
            .content-box {
                padding: 25px;
                max-width: 90%;
            }
            .main-title {
                font-size: 1.8rem;
            }
            .sub-title {
                font-size: 1rem;
            }
            .feature-image {
                border-width: 8px;
            }
        }
        @media (max-width: 480px) {
            .content-box {
                padding: 20px;
            }
            .main-title {
                font-size: 1.5rem;
                margin-bottom: 15px;
            }
            .sub-title {
                font-size: 0.9rem;
                margin-bottom: 20px;
            }
            .feature-image {
                border-width: 6px;
            }
        }