* {
    margin: 0;
    padding: 0;
}

body {
    overflow-x: hidden;
    min-width: 1200px;
    font-family: PingFang SC, '微软雅黑', Heiti SC, Helvetica, "Microsoft YaHei", Verdana, Tahoma, Arial, "Hiragino Sans GB", "Hiragino Sans GB W3", "黑体", SimSun, sans-serif;
    background-color: #f3f3f3;
}

.top {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 60px;
    border-bottom: 1px solid #dddddd;
    background-color: #fff;
    z-index: 5;
}

.nav {
    position: relative;
    margin: 0 auto;
    width: 1200px;
    height: 60px;
    background-color: #ffffff;
    text-align: center;
}

.logo {
    position: absolute;
    left: 0;
    width: 180px;
    height: 60px;
    background-image: url(../images/indexImage/logo.png);
    background-repeat: no-repeat;
    background-size: cover;
}

.nav>ul {
    height: 60px;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    margin: 0 auto;
    background-color: #ffffff;
}

.nav>ul>li {
    margin-top: 20px;
    padding-bottom: 8px;
    float: left;
    height: 32px;
    list-style: none;
}

.nav>ul>li>a {
    display: inline-block;
    margin: 0 8px;
    padding: 0 7px;
    font-size: 16px;
    font-family: "微软雅黑";
    text-decoration: none;
    line-height: 30px;
    color: black;
}

.nav>ul>li>a:hover {
    color: #0076c0;
}

.product-down {
    position: fixed;
    display: none;
    top: 61px;
    width: 100%;
    height: 430px;
    background-color: rgba(242, 243, 245, .98);
    /* border-top: 1px solid #dddddd; */
    border-bottom: 4px solid #00a0e8;
    z-index: 3;
}

.product-down>ul {
    margin: 0 auto;
    width: 1200px;
    height: 340px;
}

.product-down>ul>li {
    float: left;
    height: 340px;
    list-style: none;
}

.product-down>ul>li:nth-child(1) {
    width: 220px;
}

.product-down>ul>li:nth-child(2) {
    width: 210px;
}

.product-down>ul>li:nth-child(3) {
    width: 200px;
}

.product-down>ul>li:nth-child(4) {
    width: 150px;
}

.product-down>ul>li:nth-child(5) {
    width: 170px;
}

.product-down>ul>li:nth-child(6) {
    width: 150px;
}

.product-down>ul>li:nth-child(7) {
    width: 100px;
}

.product-down h4 {
    margin-top: 22px;
    font-size: 18px;
    font-weight: 700;
    font-family: "黑体";
}

.product-down ol {
    margin-top: 18px;
}

.product-down ol>li {
    padding-bottom: 10px;
    list-style: none;
    border-left: 1px solid #cccccc;
}

.product-down ol>li:last-child {
    padding-bottom: 0;
}

.product-down ol>li>a {
    display: inline-block;
    padding-left: 16px;
    height: 18px;
    font-size: 16px;
    font-family: "微软雅黑";
    text-decoration: none;
    color: #19a8ea;
}

.product-down ol>li>a:hover {
    text-decoration: underline;
}

@media screen and (max-width: 980px) {
    .product-down ol>li>a {
        font-size: 14px;
    }
}

.toTop {
    position: fixed;
    top: 500px;
    right: 50px;
    width: 40px;
    height: 49px;
    background: url(../images/indexImage/top.png) no-repeat;
    display: none;
    cursor: pointer;
}