@media screen and (max-width:600px) {
    /* 顶部导航栏 */
    .header {
        z-index: 1000;
        position: fixed;
        top: 0px;
        left: 0px;
        width: 1504px;
        height: 80px;
        background-color: rgb(255, 255, 255);
    }
    /* 导航栏图片 */
    .header .tupian {
        float: left;
    }
    .header .tupian img {
        margin-left: -50px;
    }
    /* 导航条 */
    .header .search {
        float: left;
        width: 22%;
        height: 80px;
    }
    /* 导航栏搜索框 */
    .search input {
        outline: none;
        float: left;
        margin-left: 10px;
        margin-top: 20px;
        /*文本框里的文字首行缩减15像素*/
        padding-left: 15px;
        width: 200px;
        height: 35px;
        color: #c2bfbf;
        border: 2px solid red;
        border-collapse: collapse;
        background-color: #fff;
    }
    .search a {
        margin-top: 20px;
        width: 50px;
        height: 39px;
        background-color: red;
        display: inline-block;
    }
    /* 伪元素制作搜索图标 */
    .search a::after {
        line-height: 40px;
        margin-left: 10px;
        color: #fff;
        font-family: 'icomoon';
        font-size: 24px;
        content: '\e986';
    }

    .background {
        width: 1504px;
        height: 600px;
        background-image: url(../images/img/platform1.jpg);
        background-repeat: no-repeat;
    }
    
    
    /* 标题导航 */
    .biaoti {
        width: 1504px;
        height: 100px;
    }
    .biaoti a:first-child {
        margin-left: 5%;
        line-height: 100px;
        color: black;
        font-family: '黑体';
        font-weight: 700;
        font-size: 24px;
    }
    .biaoti a:first-child::before {
        font-size: 20px;
        font-family: 'icomoon';
        content: '\e90f';
        color: #000;
        vertical-align: top;
        margin-right: 10px;
    }
    .biaoti a:last-child {
        line-height: 100px;
        color: rgb(223, 20, 20);
        font-family: '黑体';
        font-weight: 700;
        font-size: 24px;
    }
    .biaoti a:last-child::before {
        font-size: 26px;
        font-family: 'icomoon';
        content: '\e901';
        color: black;
        vertical-align: top;
        margin-right: 7px;
    }
    
    /* 介绍 */
    .introduce {
        width: 1504px;
        height: 550px;
    }
    .introduce .top1 {
        width: 100%;
        height: 50px;
    }
    .introduce .top1 h3 {
        text-align: center;
        line-height: 50px;
        color: black;
    }
    .introduce .jieshao {
        width: 100%;
        height: 500px;
        background-color: rgb(236, 236, 236);
    }
    .introduce .jieshao .zuo {
        float: left;
        width: 50%;
        height: 100%;
    }
    .introduce .jieshao .zuo img {
        margin-top: 40px;
        margin-left: 20%;
    }
    .introduce .jieshao .you {
        float: left;
        width: 50%;
        height: 100%;
    }
    .introduce .jieshao .you p {
        display: inline-block;
        margin-top: 4%;
        width: 60%;
        text-indent: 2em;
        font-family: '幼圆';
        font-size: 18px;
    }
    .introduce .jieshao .you p:nth-of-type(2) {
        font-weight: 700;
        text-indent: 0em;
    }
    .introduce .jieshao .you p:nth-of-type(3) {
        text-indent: 0em;
    }
    .introduce .jieshao .you p:nth-of-type(4) {
        font-weight: 700;
        text-indent: 0em;
        width: 65%;
    }
    
    /* 手册 */
    .manual {
        width: 1504px;
        height: 720px;
    }
    .manual .top2 {
        width: 100%;
        height: 80px;
        text-align: center;
    }
    .manual .top2 h3 {
        line-height: 80px;
    }
    .manual .fengmian {
        width: 100%;
        height: 640px;
    }
    .manual .fengmian .zuo {
        float: left;
        width: 53%;
        height: 100%;
    }
    .manual .fengmian img {
        width: 700px;
        margin-left: 30px;
    }
    .manual .fengmian .you {
        float: left;
        width: 47%;
        height: 100%;
    }
    .manual .fengmian .you p:first-child {
        display: inline-block;
        margin-top: 12%;
        width: 90%;
        font-family: '幼圆';
        font-size: 18px;
        font-weight: 700;
    }
    .manual .fengmian .you p:nth-of-type(2) {
        margin-top: 3%;
        text-indent: 0em;
        font-family: '幼圆';
    }
    .manual .fengmian .you p:nth-of-type(3) {
        text-align: center;
        font-family: '幼圆';
        font-size: 18px;
        font-weight: 700;
        margin-top: 5%;
    }
    .manual .fengmian .you table {
        text-align: center;
        width: 300px;
        margin-left: 33%;
        margin-top: 10px;
    }
    .manual .fengmian .you p:nth-of-type(4) {
        text-align: center;
        font-family: '幼圆';
        font-size: 18px;
        margin-top: 2%;
    }
    .manual .fengmian .you a {
        margin-left: 30.5%;
    }
    .manual .fengmian .you a:hover {
        color: red;
        text-decoration: underline;
    }

    /* 底部 */
    .footer {
        margin-top: 15px;
        float: left;
        width: 1504px;
        height: 250px;
        background-color: rgb(30, 30, 30);
    }
    .footer .center {
        margin: 0 auto;
        width: 60%;
        height: 250px;
    }
    .footer .center ul {
        float: left;
        width: 500px;
    }
    .footer .center ul li {
        margin-left: 20px;
        line-height: 40px;
        color: #fff;
    }
    /* 只选择第一个li */
    .footer .center ul li:first-child {
        font-weight: 700;
        font-size: 19px;
        color: #fff;
    }
    .footer .center ul li span {
        margin-right: 10px;
        font-size: 16px;
        font-family: 'icomoon';
    }
    .footer .center img {
        float: right;
        margin-right: 30px;
        margin-top: 20px;
        width: 100px;
        height: 100px;
    }
    .xian {
        float: left;
        width: 900px;
        height: 1.5px;
        background-color: #fff;
    }
    .footer p {
        float: left;
        margin-top: 30px;
        margin-left: 150px;
        color: #fff;
    }
}