/* 模态弹窗样式 */
        .modal {
            display: none; 
            position: fixed;
            z-index: 1000;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            overflow: auto; 
            background-color: rgba(0,0,0,0.5); 
            align-items: center;
            justify-content: center;
        }
        .modal-content {
            background-color: #fff;
            padding: 20px;
            border-radius: 5px;
            position: relative;
            max-width: 400px;
            width: 90%;
            box-shadow: 0 2px 8px rgba(0,0,0,0.2);
            text-align: center;
            display: flex;
            flex-direction: column;
            align-items: center; 
            justify-content: center; 
            min-height: 200px; 
        }
        .modal-content img {
            width: 100%;
            max-width: 300px;
            margin-top: 20px; 
        }
        .close {
            position: absolute;
            top: 10px;
            right: 15px;
            color: #aaa;
            font-size: 28px;
            font-weight: bold;
            cursor: pointer;
        }
        .close:hover,
        .close:focus {
            color: black;
            text-decoration: none;
        }