/* 自定義優化 */
        body {
            font-family: "Microsoft JhengHei", "PingFang TC", sans-serif;
            background-color: #f8f9fa !important; /* 更柔和的底色 */
            margin: 0; /* 確保沒有預設外邊距導致間隙 */
            padding: 0;
        }
        /* 導覽列與側邊欄銜接優化 */
        .w3-teal, .w3-bar {
            margin-top: 0 !important;
            background-color: #1abc9c !important; /* 翡翠綠 */
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
            position: relative;
            z-index: 10; /* 確保陰影蓋在內容上 */
        }


        /* 導覽列優化 */
        .w3-teal {
            background-color: #1abc9c !important; /* 翡翠綠 */
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }

        /* 內容容器美化 */
        .w3-container {
            padding: 24px !important;
        }

        #main_contain {
            background: white;
            padding: 30px;
            border-radius: 8px;
            box-shadow: 0 4px 15px rgba(0,0,0,0.05);
            margin-top: 20px;
        }