/* 基础样式 */
       body {
           margin: 0;
           padding: 0;
           color: #333;
           font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
           height: 100vh;
		   max-width: 640px;
		   margin: 0 auto !important;
		   background: #f5f5f5;
       }
       a{
		     text-decoration: none;
		   color: #333;
	   }
	   
	   /* 导航栏容器 */
        .nav-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 44px;
            background-color: #000;
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 0 15px;
            z-index: 1000;
        }
        
        /* 返回箭头按钮 */
        .back-button {
            position: absolute;
            left: 15px;
            width: 24px;
            height: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
        }
        
        /* 使用CSS绘制箭头图标 */
        .back-button::before {
            content: "";
            display: block;
            width: 10px;
            height: 10px;
            border-left: 2px solid #fff;
            border-bottom: 2px solid #fff;
            transform: rotate(45deg);
            margin-right: 3px;
        }
        
        /* 标题样式 */
        .nav-title {
            font-size: 17px;
            font-weight: 500;
            text-align: center;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            max-width: 70%;
        }
        .heights{
            height: 50px;
        }