html {
    /* 让滚动条丝滑的滚动 */
    scroll-behavior: smooth;
}

/* 版心设置 */
.wrapper {
    margin: 0 auto;
    width: 1520px;
}

/* 头部区域导航栏 */
.header {
    /* 固定定位新用法 sticky*/
    /* -webkit 兼容浏览器 */
    /* position:-webkit-sticky; */
    /* position:sticky; */
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    /* 固定定位的盒子，宽度高度靠内容撑开，希望宽度100%，高度根据内容撑开 */
    /* width: 100%; */
    background: rgba(255, 255, 255, 0.2);
    border-bottom: #dfdfdf 1px solid;
    z-index: 100;
    transition: all 0.5s;

}

.header .wrapper {
    display: flex;
    height: 70px;
    align-items: center;
    justify-content: space-between;
}

/* logo图片 */
.logo a {
    display: block;
    width: 140px;
    height: 40px;
    background-image: url(../images/logo.png);
    font-size: 0;
}

/* 导航 */
.header .nav ul {
    display: flex;
    width: 456px;
    height: 68px;
    flex-wrap: nowrap;
    justify-content: space-between;
    align-items: center;
}

.header .nav ul .li-dis .a-dis {
    font-size: 16px;
    color: #222;
}

/* active 类选择器，表示默认选中的a */
.header .nav ul .li-dis .active,
.header .nav ul .li-dis .a-dis:hover {
    color: #165DFF;
    border-bottom: 3px solid #165DFF;
    padding-bottom: 22px;
}

/* 下拉菜单 */
.header .pull-down {
    position: absolute;
    top: 80px;
    left: 50%;
    width: 864px;
    height: 300px;
    background: #FFFFFF;
    border-radius: 5px;
    box-shadow: 0px 10px 25px 0px rgba(141, 141, 141, 0.20);
    transition: all 0.5s;
    height: 0;
    overflow: hidden;

}

.header .nav .li-dis:hover .pull-down {
    height: 290px;
}

.header .nav .li-dis .pull-down h5 {
    margin-top: 34px;
    margin-left: 34px;
    margin-bottom: 20px;
    font-size: 16px;
    color: #737373;
    font-weight: 400;
    line-height: 14px;
}

.header .nav .li-dis .pull-down .line {
    margin-left: 34px;
    margin-bottom: 30px;
    width: 800px;
    height: 1px;
    background: #DCDFE5;
}

.header .nav .li-dis .pull-down .ul-box {
    margin: 30px auto;
    /* margin-left: 34px; */
    width: 800px;
}

.header .nav .li-dis .pull-down .ul-box ol {
    display: flex;
    height: 186px;
    flex-wrap: wrap;
    justify-content: space-between;
}

.header .nav .li-dis .pull-down .ul-box ol .drop a {
    display: flex;
    align-items: center;
    width: 370px;
}

.header .nav .li-dis .pull-down .ul-box ol .drop a img {
    width: 60px;
    vertical-align: middle;
}

.header .nav .li-dis .pull-down .ul-box ol .drop .li-box {
    margin-left: 15px;
}

.header .nav .li-dis .pull-down .ul-box ol .drop .li-box h3 {
    font-weight: 700;
    font-size: 16px;
    color: #000000;
    line-height: 16px;
}

.header .nav .li-dis .pull-down .ul-box ol .drop .li-box p {
    margin-top: 8px;
    font-size: 14px;
    color: #666666;
}

.header .nav .li-dis .pull-down .ul-box ol .drop a:hover .li-box h3,
.header .nav .li-dis .pull-down .ul-box ol .drop a:hover .li-box p {
    color: #165DFF;

}

/* 底部版权 */
.footer {
    height: 470px;
    background: #111111;

}

.footer .footer-nav {
    display: flex;
}

.footer .footer-nav .left img {
    margin-top: 93px;
    margin-left: 36px;
}

.footer .footer-nav .right {
    margin-left: 304px;
    margin-top: 93px;
    display: flex;
    color: #fff;
}

.footer .footer-nav .right dl {
    margin-left: 158px;
    margin-bottom: 75px;

}

.footer .footer-nav .right dt {
    font-weight: bold;
    font-size: 18px;
}

.footer .footer-nav .right dl a,
.footer .footer-nav .right dl dd {
    display: block;
    margin-top: 20px;
    font-size: 16px;
    color: #828B98;
}

.footer .footer-nav .right dl a:hover {
    color: #c8cdd4;
}

.footer .line {
    margin: 0 auto;
    width: 1520px;
    border: 1px solid #393C40;
}

.footer p a {
    display: block;
    margin-top: 40px;
    font-size: 16px;
    color: #828B98;
    text-align: center;
    line-height: 16px;
}

.footer p a:hover {
    color: #626c7a;
}

/* 回到顶部TOP */
.top {
    position: fixed;
    right: 3%;
    top: 80%;
    width: 56px;
    height: 56px;
    background-color: #fff;
    border-radius: 50%;
    box-shadow: 0px 0px 10px 0px rgba(0, 0, 0, 0.2);
    opacity: 0;
    transition: all .5s;
}

.top a {
    margin: 15px auto;
    display: block;
    font-size: 12px;
    color: #000;
    text-align: center;
    line-height: 20px;
}

.top a:hover {
    color: #165DFF;
}

.top a i {
    margin: 0 auto;
    display: block;
    width: 14px;
    height: 9px;
    background-image: url(../images/top.png);
}