@charset "utf-8";
.lt_bn {position:relative; height: 100vh}
.lt_bn li::before{width: 100%; height: 100%; background-color: rgba(0,0,0,0.4); top: 0; left: 0; content: ''; position: absolute; z-index: 3;}
.lt_bn .bx-wrapper{max-width: 100% !important;}
.lt_bn li{position:relative;text-align:center;}
.lt_bn li img{width:100%;height:100vh;object-fit: cover;vertical-align:top; background-color: #fff; max-width: 100%; border: 1px solid #eee; }
.lt_bn .bn_txt{position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%); width: 1400px; max-width: 70%; z-index: 10;}
.lt_bn .txt_wr{max-width:1280px;margin:0 auto;padding:0 3%}

.lt_bn li .bn_tit{display:block;}
.lt_bn li .bn_detail{
    font-size: 30px;
    text-align: center;
    position: relative;
    margin-bottom: 60px;
    display: block;
    color: #fff;
    font-weight: bold;
}
.lt_bn li .bn_detail:after {
    position: absolute;
    width: 30px;
    height: 4px;
    background: #111;
    content: '';
    left: 50%;
    transform: translateX(-50%);
    bottom: -30px;
}
.lt_bn li .bn_view {background:#DF0012;color:#fff;border:2px solid #fff;padding:0 25px;line-height:45px;border-radius:30px;
;transition: 0.3s all ease-in-out;
-webkit-transition: 0.3s all ease-in-out;
-moz-transition: 0.3s all ease-in-out;
-o-transition: 0.3s all ease-in-out;
-ms-transition: 0.3s all ease-in-out
}
.lt_bn li .bn_view:hover{background:#DF0012;color:#fff}

.arrow{position: relative; display: inline-block;vertical-align: middle;transform: rotate(45deg);box-sizing: border-box;width: 11px;height: 11px; border-width: 2px 2px 0 0; border-style: solid;margin-left: 25px;}
.arrow:before {right: 0; top: -1px; position: absolute; height: 2px; box-shadow: inset 0 0 0 32px; width: 18px;
-webkit-transform: rotate(-45deg);transform: rotate(-45deg);
-webkit-transform-origin: right top;}
.arrow:after,.arrow:before {content: "";box-sizing: border-box;}
.lt_bn .bx-prev{position:absolute;z-index: 10;top:50%;left:0;width:50px;height:50px;margin-top:-25px; opacity: 0.7; text-indent:-999px;overflow:hidden;background:url(prev.png) no-repeat 50% 50% #333}
.lt_bn .bx-next{position:absolute;z-index: 10;top:50%;right:0;width:50px;height:50px;margin-top:-25px; opacity: 0.7;text-indent:-999px;overflow:hidden;background:url(next.png) no-repeat 50% 50%  #333}
.lt_bn .bx-prev:hover,.lt_bn .bx-next:hover{opacity:1}
.lt_bn .bn_link {display:block;position:absolute;bottom:10px;left:10px;z-index: 10;;background:#ff0000;color:#fff;border-radius:50px;width:40px;padding:0;line-height:40px;text-align:center;opacity:0}
.lt_bn:hover .bn_link{opacity:1} 

@media (max-width:1279px){    
    .lt_bn li .bn_detail{font-size: 20px;}

 }

@media (max-width: 969px){

 }
 
@media (max-width: 639px){

}