@media(max-width:1199px){
    .nav li{float:left;padding: 0 11px;}
.header-box{padding:0 10px;}
       .nav-box > ul { display: flex; justify-content: space-between;}
}
@media(max-width:840px){
.sousuo{width:100px;}
.lanmu h1{-webkit-line-clamp: 1;}

}
@media(max-width:640px){
    .sousuo{width:70px;}
}
.min-height { min-height: calc(100vh - 600px);}
@media(min-width:640px){
.search{border-radius: 30px;background: rgba(4,83,164,.4);width:260px;float:right;height:40px;margin-top:33px;}
.sousuo{margin-top:0;border:none;background:none;height:40px; width: 200px !important;}
.button{ width: auto; height: auto; margin-top:0;border:none;background:none;margin-top:7px;margin-right:15px;}
input::-webkit-input-placeholder { /* chrome, opera, safari */
  color: #fff;}
 
input:-moz-placeholder { /* firefox 18- */
  color: #fff;
  opacity: 1;}
 
input::-moz-placeholder { /* firefox 19+ */
  color: #fff;
  opacity: 1;}
 
input:-ms-input-placeholder { /* internet explorer 10-11 */
  color: #fff;}
}
@media screen and (max-width: 640px) {
.wrapper { height: 170px;}
.img_group img { height: 170px; object-fit: cover;}
}
@media screen and (max-width: 480px) {
.wrapper { height: 170px;}
.img_group img { height: 170px; object-fit: cover;}
}
.header { position:relative; z-index: 2;}
.lanmu .xwtp{position: relative;overflow:hidden;}
.lanmu .xwtp .zuopintu{padding-top: 71%;
    height: 0;
    background-repeat: no-repeat;
    background-position: 50% 50%;
    background-color: transparent;
    background-size: cover;}
.jiaoshi-lanmu .pic{ padding-top: 75%;
    height: 0;
    background-repeat: no-repeat;
    background-position: 50% 50%;
    background-color: transparent;
    background-size: cover;
width:75%;
margin:0 auto;}
/*公共样式*/