@media (min-width:1200px){
/*隐藏_mb_html*/	
.mb_box{display:none;}

/*页脚置底*/
html,body{height:100%;margin:0;padding:0;}
#container{min-height:100%;height: auto !important;height:100%;}
.push{clear:both;}


/*nav_bg*/
.nav_bg{width:100%;position:absolute;top:0;left:0;z-index:12;border-bottom:solid 1px rgba(255,255,255,0.2);background:rgba(0,0,0,0.2);}
/*.nav_bg:after{content:'';width:100%;height:222px;background-image:url('../image/banner/pc_nav_bg.png');background-repeat:repeat-x;background-position:center center;
position:absolute;top:0;left:0;z-index:-1;}*/
.nav_box{width:1300px;margin:0 auto;display:flex;align-items:center;padding:0 20px;}
.nav_box>li:nth-child(1){width:15%;}
.nav_box>li:nth-child(1) img{width:60%;}
.nav_box>li:nth-child(2){width:85%;border-left:solid 1px rgba(255,255,255,0.2);/*border-right:solid 1px rgba(255,255,255,0.2);*/box-sizing:Border-box;}
/*.nav_box>li:nth-child(3){width:6.5%;border-right:solid 1px rgba(255,255,255,0.2);height:80px;}
.nav_box>li:nth-child(4){width:6.5%;display:flex;align-items:center;justify-content:center;}*/

.nav{display:flex;align-items:center;}
.nav>dd{width:16.66%;box-sizing:border-box;height:80px;position:relative;transform-style:preserve-3d;cursor:pointer;}
.nav>dd>a,.nav>dd>p{width:100%;text-align:center;font-size:1.4rem;color:#fff;height:80px;line-height:25px;position:absolute;transition: 0.5s;}

.nav_normal{left:0;top:0;display:flex;align-items:center;justify-content:center;}
.nav_trans{left:0;top:50%;transform:perspective(10px) rotateX(-1deg);background:rgba(255,255,255,0.2);opacity:0;display:flex;align-items:center;justify-content:center;}

.nav>dd:hover .nav_normal{width:100%;position:absolute;top:-80px;left:0;}
.nav>dd:hover .nav_trans{width:100%;position:absolute;top:0;left:0;transform:perspective(0) rotateX(0);opacity:10;}

.search_btn{width:28px;height:28px;background-image:url('../image/nav_search.png');background-repeat:no-repeat;background-size:28px 28px;background-position:center center;cursor:pointer;transition:0.5s;}
.search_btn:hover{width:35px;height:35px;background-size:35px 35px;}

.nav_box>li:nth-child(4){height:80px;cursor:pointer;}
.nav_box>li:nth-child(4) a{width:30px;height:30px;background-image:url('../image/nav_wechat.png');background-repeat:no-repeat;background-size:28px 28px;background-position:center center;transition:0.5s;}
.nav_box>li:nth-child(4):hover a{width:35px;height:35px;background-size:35px 35px;}

.nav_son{background:rgba(255,255,255,0.9);width:100%;position:absolute;top:100%;left:0;box-shadow:0 1px 5px #999;display:none;}
.nav_son a{text-align:center;line-height:45px;color:#000;font-size:1.4rem;border-bottom:solid 1px rgba(0,0,0,0.4);}
.nav_son a:last-child{border-bottom:none;}

.nav>dd:hover .nav_son{display:block;}
.nav_son a:hover{color:#a82125;}

/*nav_bg_fixed*/
.nav_bg_fixed{background:#fff;position:fixed;top:-80px;left:0;z-index:11;box-shadow:0 0 5px #ccc;border-bottom:none;transition:0.5s;opacity:0;}
.nav_bg_fixed:after{content:'';background:none !important;width:100%;height:0;}
.nav_bg_fixed .nav_box>li:nth-child(4) a{background-image:url('../image/nav_wechat_black.png');}
.nav_bg_fixed .search_btn{background-image:url('../image/nav_search_black.png');}
.nav_bg_fixed .nav>dd>a,.nav_bg_fixed .nav>dd>p{color:#000;}
.nav_bg_fixed .nav_box>li:nth-child(2){border-left:solid 1px #f0efef;/*border-right:solid 1px #f0efef;*/}
.nav_bg_fixed .nav_box>li:nth-child(3){border-right:solid 1px #f0efef;}
.nav_bg_fixed .nav_trans{background:rgba(0,0,0,0.03);}
.nav_bg_fixed .nav_son a:hover{color:#a82125;}

/*overlay_wechat*/
.overlay_wechat{width:1300px;margin:0 auto;position:fixed;top:80px;left:50%;margin-left:-650px;height:80px;display:none;z-index:11;}
.overlay_wechat img{position:absolute;right:0;top:0;width:86px;}

/*search_box*/
.search_box{width:100%;height:100%;background:rgba(0,0,0,0.8);position:fixed;top:0;left:0;z-index:12;box-sizing:border-box;border:solid 1px rgba(0,0,0,0.8);transition:0.5s;display:none;}
.search_close_btn{width:50px;height:50px;position:absolute;right:20px;top:20px;cursor:pointer;transition:0.3s;
background-image:url('../image/close.png');background-repeat:no-repeat;background-size:50px 50px;background-position:center center;}
.search_box input{width:50%;height:100px;position:absolute;left:50%;margin-left:-25%;top:50%;margin-top:-40px;
font-size:6rem;background:None;border:none;border-radius:0;border-bottom:solid 1px #bd252a;line-height:100px;color:#fff;}
.search_box input::-webkit-input-placeholder{color:#ccc;}
.search_close_btn:hover{background-image:url('../image/close_hover.png') !important;}

/*news_nav*/
.news_nav_bg{background:#bd252a;padding-top:120px;padding-bottom:200px;margin-bottom:-185px;}
.news_nav{width:1300px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:0 20px;}
.news_nav>li:nth-child(1) h1{font-size:3.2rem;color:#fff;font-weight:Normal;margin-bottom:5px;}


/*case_box*/
.case_box{width:1300px;margin:0 auto;margin-top:20px;display:Flex;align-items:flex-start;flex-wrap:wrap;}
/*.case_box>li{width:32%;margin-right:2%;margin-bottom:2%;box-sizing:border-box;background:#fff;box-shadow:0 0 5px #999;cursor:pointer;}
.case_box>li:nth-child(3n+3){margin-right:0;}*/

.case_box>li{width:calc(33.33% - 40px);margin:20px;box-sizing:border-box;background:#fff;box-shadow:0 0 5px #999;cursor:pointer;}

.case_box>li{position:relative;}
.case_photo{width:100%;height:200px;overflow:hidden;background-size:100%;background-position:center top;background-repeat:no-repeat;transition:1s;}
.case_photo img{width:100%;transition:3s;}
.case_text{padding:20px;box-sizing:Border-box;}
.case_text h1{font-size:1.8rem;color:#323232;font-weight:normal;margin-bottom:5px;overflow:hidden;text-overflow:ellipsis; white-space:nowrap;transition:0.3s;}
.case_line{display:none;}
.case_text h2{font-size:1.2rem;color:#6b6b6b;font-weight:normal;overflow:hidden;text-overflow:ellipsis; white-space:nowrap;margin-top:5px;margin-bottom:5px;}
.case_text h3{font-size:1.2rem;color:#848484;font-weight:normal;/*overflow:hidden;text-overflow:ellipsis; white-space:nowrap;height:60px;*/line-height:20px;}
.case_text dl{display:flex;flex-direction:row-reverse;}
.case_text dl dd{display:flex;align-items:center;font-size:1.2rem;color:#8b8b8b;line-height:30px;padding:0 15px;border:solid 1px #cfcfcf;transition:0.3s;position:relative;z-index:1;}
.case_ps{width:0;height:30px;position:absolute;left:0;top:0;transition:0.3s;z-index:-1;}

.case_box a:hover .case_photo{background-size:110%;}
.case_box a:hover h1{color:#bd252a;}
.case_box a:hover dl dd{border:solid 1px #bd252a;color:#fff;}
.case_box a:hover .case_ps{width:100%;background:#bd252a;}

/*mb_overlay*/
.mb_overlay{width:100%;height:100%;margin:0 auto;position:fixed;top:0;left:0;background:rgba(0,0,0,0.7);display:none;align-items:center;justify-content:center;z-index:50;}
.mb_overlay ul{background:#fff;padding:20px;border-radius:10px;position:relative;}
.mb_overlay_close{width:40px;height:40px;position:absolute;right:-20px;top:-20px;cursor:pointer;}
.mb_overlay_code{width:120px;}
.mb_overlay ul p{text-align:center;color:#000;margin-top:6px;font-size:1.6rem;}

/*video_overlay*/
.video_overlay{width:100%;height:100%;margin:0 auto;position:fixed;top:0;left:0;background:rgba(0,0,0,0.7);z-index:500;
display:none;align-items:Center;justify-content:center;}
.video_overlay ul{width:70%;height:auto;position:relative;}
.video_overlay_close{width:50px;height:50px;position:absolute;right:-60px;top:-10px;cursor:pointer;}
.video_overlay ul li{width:100%;height:100%;background:#000;padding:10px;border-radius:5px;box-shadow:0 0 5px #333;}
.video_overlay ul li video{width:100%;height:auto;max-height:90vh;}





}