.header_nav .first {
    position: static;
    display: inline-block;
}
.header_nav .first:hover > a:after {
    left: 0;
    right: 0;
}
.header_nav .second {
    display: none;
    position: absolute;
    top: 90px;
    left: 0;
    width: 100%;
    padding: 0 90px 0 85px;
    z-index: 2;
    background-color: #fff;
    line-height: 3;
    border-top: 1px solid #fd6401;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
    font-size: 16px;
}
.header_nav .second ul {
    margin: 30px 0;
    text-align: center;
}
.header_nav .second li {
    display: inline-block;
    float: none;
    margin-bottom: 10px;
}
.header_nav .second li .img {
    width: 160px;
    height: 90px;
    border: 1px solid #e8e8e8;
    overflow: hidden;
    text-align: center;
    line-height: 90px;
    background-position: center;
    background-size: cover;
    padding: 2px;
}
.header_nav .second li p {
    margin-top: 10px;
    line-height: 1.5;
}
.header_nav .second li:hover p{
    font-weight: normal;
}
.main_about .content .num span {
    vertical-align: bottom;
    color: #fd6401;
    font-size: 40px;
    line-height: 2.5;
}
.footer_map .map_list:hover .ma {
    display: block;
}
.header .search .search-bt {
    position: absolute;
    height: 100%;
    width: 0;
    right: 100%;
    color: #fff;
    background-color: #fd6401;
    font-size: 16px;
    -webkit-transition: all 0.6s;
    -moz-transition: all 0.6s;
    -ms-transition: all 0.6s;
    -o-transition: all 0.6s;
    transition: all 0.6s;
}
.header .search .search-bt input {
    position: static;
    height: 50%;
    width: 100%;
    right: auto;
    -webkit-transition: none;
    -moz-transition: none;
    -ms-transition: none;
    -o-transition: none;
    transition: none;
    background: rgba(255,255,255,0.7);
    -webkit-border-radius: 22px;
    -moz-border-radius: 22px;
    border-radius: 22px;
}
.video .contain {
    position: relative;
}
.video .v-search {
    position: absolute;
    right: 0;
    top: 0;
}
.video .v-search input {
    width: 220px;
    height: 40px;
    padding: 0 35px 0 14px;
    background-color: #f9fbfd;
    border: solid 1px #e9e9e9;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}
.video .v-search button {
    position: absolute;
    width: 35px;
    height: 100%;
    right: 0;
    top: 0;
    cursor: pointer;
}
.product_detail .product_nav .txt {
    display: none;
}
.product_detail .product_nav .txt.active {
    display: block;
}
.case .case-nav {
    margin-bottom: 60px;
    flex-wrap: wrap;
    justify-content: flex-start;
}
.case .case-nav a {
    /*float: left;*/
    width: 12.2%;
    height: 50px;
    margin-right: 2.2%;
    margin-bottom: 20px;
    text-align: center;
    line-height: 50px;
    border-radius: 4px;
    border: solid 1px #e9e9e9;
    font-size: 18px;
    color: #666;
}
.case .case-nav a:last-child {
    margin-right: 0;
}
.case .case-nav a:hover,
.case .case-nav a.active{
    color: #d91f17;
    border-color: #d91f17;
}
.plan .plan_item:nth-child(2n) {
    background-color: #fff;
}
.footer_map .map_list {
    margin: 0 20px;
}
.footer_map .map_list .erweima {
    width: 100px;
    height: 100px;
}
.footer_map .map_list p {
    margin-top: 15px;
    font-size: 14px;
}
.video .v-video {
    justify-content: flex-start;
}
.video .v-video .items {
    width: 31%;
    margin-right: 3.5%;
}
.video .v-video .items:nth-child(3n) {
    margin-right: 0;
}
.video .v-video .info {
    padding: 30px 20px;
    font-size: 20px;
    line-height: 1.75;
}
.header_nav .first:nth-child(3) .second .img{
    background-size: 90% 85%;
    background-repeat: no-repeat;
}
@media screen and (max-width: 1000px){
    .header_nav .second {
        padding: 0;
        top: 0;
        border-top: none;
    }
    .header_nav .second li .img {
        display: none;
    }
    .header_nav .second ul {
        margin: 1rem 0;
    }
    .header_nav .second li {
        float: none;
        margin-bottom: 1rem;
    }
    .header_nav .second li p {
        margin-top: 0;
    }
    .header_nav .second li a {
        display: block;
    }
    .video .v-search {
        width: 40%;
        right: 4%;
    }
    .video .v-search input {
        width: 100%;
        height: 35px;
        vertical-align: top;
    }
    .video .v-search form {
        height: 35px;
        vertical-align: top;
    }
    .case .case-nav a {
        width: 30%;
        height: 2.2rem;
        margin-right: 2.24%;
        line-height: 2.2rem;
        font-size: 1rem;
        margin-bottom: 1rem;
    }
    .case .case-nav a:nth-child(3n) {
        margin-right: 0;
    }
    .header_nav .first {
        position: relative;
    }
    .header_nav .second {
        position: relative;
        background-color: #f9fbfd;
    }
    .main_about .content .num span {
        font-size: 1.2rem;
    }
    .footer_map {
        display: flex;
        justify-content: space-around;
    }
    .footer_map .map_list {
        margin: 0;
        text-align: center;
    }
    .footer_map .map_list .erweima {
        display: inline-block;
        width: 80%;
        max-width: 160px;
        height: auto;
    }
    .video .v-video .items {
        width: 48%;
        margin-right: 4%;
    }
    .video .v-video .items:nth-child(3n) {
        margin-right: 4%;
    }
    .video .v-video .items:nth-child(2n) {
        margin-right: 0;
    }
    .video .v-video .info {
        padding: 1.5rem;
        font-size: 1rem;
    }
}

.case .case_item .img .ig,
.news .content .news_item .img_box .ig {
    padding-top: 75%;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    transition: transform 0.6s;
    -webkit-transition: transform 0.6s;
    -moz-transition: transform 0.6s;
    -ms-transition: transform 0.6s;
    -o-transition: transform 0.6s;
}
.case .case_item:hover .img .ig,
.news .content .news_item:hover .img_box .ig  {
    transform: scale(1.1);
    -webkit-transform: scale(1.1);
    -moz-transform: scale(1.1);
    -ms-transform: scale(1.1);
    -o-transform: scale(1.1);
}
.news .content .news_item .img_box .ig {
    padding-top: 70%;
}
@media screen and (min-width:1000px) {
    .case .case_item .msg{
        overflow: hidden;
        text-overflow: ellipsis;
        display: -webkit-box;
        -webkit-line-clamp: 6;
        -webkit-box-orient: vertical;
        max-height: 168px;
    }
}

.cd-top {
    display: inline-block;
    height: 40px;
    width: 40px;
    position: fixed;
    bottom: 40px;
    right: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
    /* image replacement properties */
    overflow: hidden;
    text-indent: 100%;
    white-space: nowrap;
    background: rgba(210, 12, 12, 0.8) url(../images/cd-top-arrow.svg) no-repeat center 50%;
    visibility: hidden;
    opacity: 0;
    -webkit-transition: all 0.3s;
    -moz-transition: all 0.3s;
    transition: all 0.3s;
}
.cd-top.cd-is-visible {
    /* the button becomes visible */
    visibility: visible;
    opacity: 1;
}
.cd-top.cd-fade-out {
    /* 如果用户继续向下滚动,这个按钮的透明度会变得更低 */
    opacity: 1;
    background-color: #fd6401;
}
.no-touch .cd-top:hover {
    background-color: #fd6401;
    opacity: 1;
}
@media only screen and (min-width: 768px) {
    .cd-top {
        right: 20px;
        bottom: 20px;
    }
}
@media only screen and (min-width: 1024px) {
    .cd-top {
        height: 60px;
        width: 60px;
        right: 30px;
        bottom: 30px;
    }
}