@charset "utf-8";

ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

ul:after ，.anli_banner .items li::after, .foot form li::after, .case_list li a::after {
    content: '';
    display: block;
    clear: both;
}

a {
    color: #202425;
    text-decoration: none !important;
}

a:hover {
    color: #202425;
}

p {
    margin: 0;
}

body {
    /* height: 9999px; */
    font-family: "Helvetica Neue", Helvetica, Arial, "Microsoft YaHei", sans-serif;
}
.txt_2{
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
    overflow: hidden;
}
.brief {
    /* 摘要 */
    font-size: 16px;
    line-height: 24px;
    color: rgba(32, 36, 37, 0.50);
}
.color-99 {
    color: #999;
}
.color-66 {
    color: #666;
}
.fw400{
    font-weight: 600;
}
.fw300{
    font-weight: 300;
}

.f12 {
    font-size: 12px;
}

.f14 {
    font-size: 14px;
}

.f18 {
    font-size: 18px;
}

.f20 {
    font-size: 20px;
}

.f26 {
    font-size: 26px;
}

.f30 {
    font-size: 30px;
}

.f40 {
    font-size: 40px;
}

.f50 {
    font-size: 50px;
}
.f70{
    font-size: 70px;
}
.f60 {
    font-size: 60px;
}

.f80 {
    font-size: 80px;
}
.f85{
    font-size: 85px;
}

.f100 {
    font-size: 100px;
}

.lh1 {
    line-height: 1;
}

.lh20 {
    line-height: 20px;
}

.lh40 {
    line-height: 40px;
}

.lh60 {
    line-height: 60px;
}

.lh80 {
    line-height: 80px;
}

.lh100 {
    line-height: 100px;
}

.mt10 {
    margin-top: 10px;
}

.mt20 {
    margin-top: 20px;
}

.mt30 {
    margin-top: 30px;
}

.mt50 {
    margin-top: 50px;
}

.mt100 {
    margin-top: 100px;
}

.swiper-pagination-bullet {
    width: 30px;
    height: 10px;
    margin: 0 7.5px;
    border-radius: 0px;
}

.swiper-active-switch {
    background: #fff;
    opacity: 1;
}

/* 头部 */

.head {
    position: absolute;
    top: 20px;
    width: 100%;
    z-index: 999;
}

.head li a {
    color: #fff;
}

.head .u1>li {
    float: right;
    position: relative;
}

.head .u1>li:hover .u2 {
    display: block;
}

.head .u1>li .on::after {
    content: '';
    display: block;
    position: absolute;
    bottom: 0;
    left: calc(50% - 25px);
    width: 20px;
    height: 2px;
    background: #fff;
}

.head .u1>li>a {
    padding-right: 25px;
    display: block;
    font-size: 16px;
    line-height: 40px;
}

.head .u2 {
    background: rgba(32, 36, 37, 0.50);
    border: 1px solid #FFFFFF;
    box-sizing: border-box;
    position: absolute;
    width: 240px;
    top: 100%;
    left: 0;
    z-index: 1;
    display: none;
}

.head .u2 li {
    line-height: 50px;
    text-align: left;
    padding: 0 10px;
}

.head .u2 li a {
    display: block;
    font-size: 14px;
    color: #fff;
    border-top: 1px solid rgba(255, 255, 255, 0.50);
}

.head .u2 li:hover {
    background-color: rgba(255, 255, 255, 0.10);
}

.btntop {
    position: fixed;
    top: 60%;
    right: 0;
    width: 50px;
    height: 50px;
    background: url(../img/totop.png)no-repeat center/cover;
    cursor: pointer;
}

.head .u1>li>span{
    color: #fff;
    display: none;
    font-family: '宋体';
    font-weight: bold;
}
.head .u2.on{
    height: 100%;
}
.index_nav.on{
    left: 0;
}
.m_block{
    display: none;
    position: relative;
    z-index: 999;
}
.m_nav{
    transition: .5s;
    background: url(../img/m_on.png)no-repeat center;
}
.m_nav.on{
    background: url(../img/m_off.png)no-repeat center;
}
@media(max-width:768px){
    .m_block{display: block;}
    .mt30,.mt20{margin-top: 10px;}
    .f20{font-size: 14px;}
    .f30{font-size: 16px;}
    .f40{font-size: 20px;}
    .f50{font-size: 25px;}
    .f60{font-size: 30px;}
    .f80{font-size: 40px;}
    .f100{font-size: 40px;}
    .lh40 {line-height: 1.5;}
    .lh60{line-height: 30px;}
    .lh80{line-height: 40px;}
    .lh100{line-height: 50px;}
    .index_nav{position: fixed;top: 0;left: -100%;background-color: rgba(0,0,0,.9);width: 100%;height: 100%;padding-top: 20px;transition: .5s;overflow: auto;}
    .head .u1{display: flex;flex-direction: column-reverse;overflow: auto;}
    .head .u1>li{width: 70%;text-align: left;margin: 0 auto;}
    .head .u2{display: block;position: static;background: none;border: none;width: 100%;height: auto;overflow: hidden;}
    .head .u2 li{text-align: center;line-height: 35px;}
    .head .u1>li>a{display: inline-block;}
    .head .u1>li>span{display: inline-block;}
    .pl-5, .px-5{padding: 0 !important;}
    .brief{font-size: 14px;}
    .mt50{margin-top: 10px;}
    .mt100{margin-top: 20px;}
    .head .px-5>.row{margin-right: 0px; margin-left: 0px;}
    .head .u1>li .on::after{display: none;}
}