.dv_menu_con{min-height:500px;}
.breadcrumb{min-height:290px;text-align:center;}
.breadcrumb .position_center{max-height:100px;}
.breadcrumb h2{font-weight:400;line-height:60px;}
.oblique_line{padding:0 8px;}
.ul_list{overflow:hidden;padding:2%;background:#f5f5f5;}
.ul_list li{position:relative;float:left;padding:0 10px 0 25px;width:25%;}
.ul_list li span{position:absolute;left:10px;}
.ul_list li a,.or_block_nav a{font-size:16px;}
.or_block_nav a,.or_block_nav span,.ul_list li a,.ul_list li span{display:inline-block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;line-height:50px;max-width:100%;}
.ul_list a:hover,.ul_list li:hover{color:#147fde;}
.or_block_nav{display:inline-block;width:100%;}
.or_block_nav li{position:relative;float:left;margin-right:1%;margin-bottom:1%;padding-left:60px;width:24%;background:#f6f6f6;}
.or_block_nav a{width:100%;}
.or_block_nav span{position:absolute;top:0;bottom:0;left:0;width:50px;background:#5e9cf3;color:#fff;text-align:center;}
.or_block_nav li:hover{background:#fff;-webkit-box-shadow:1px 1px 10px rgb(20 127 222 / 50%);-moz-box-shadow:1px 1px 10px rgba(20,127,222,.5);box-shadow:1px 1px 10px rgb(20 127 222 / 50%);}
.or_block_nav li:hover span{background:#147fde;}
/*material science */
.menu_material_science{overflow:hidden;padding-top:2%;}   
.menu_material_science .F36{border-bottom:1px solid #aaa;margin-bottom:1%;padding-bottom:2%;}   
.menu_material_science .ul_list,.menu_material_science .menuul{float:left;width:24%;padding:0;background:#fff;}
.menu_material_science .ul_list li,.menu_material_science .menuul li{position:relative;width:100%;background:#f5f5f5;margin-bottom:10px;}
.menu_material_science .ul_list li{padding:10px 10px 10px 30px;}
.menu_material_science .ul_list li a{max-width:100%;}
.menu_material_science .ul_list li span{position:absolute;left:15px;top:10px;}
.menu_material_science .menu_desc{float:right;width:74%;}   
.menu_material_science p{padding-top:10px;line-height:32px;font-size:16px;}
.flex_img{margin:2% 0;-webkit-display:flex;display:flex;-webkit-justify-content:space-between;justify-content:space-between;-webkit-flex-wrap:wrap;flex-wrap:wrap;}
.flex_img span{display:inline-block;width:32.5%;margin:0.42% 0;}

@media only screen and (max-width:1440px){
 	.ul_list li,.or_block_nav li{width:32.3%;}
 	.breadcrumb{min-height:270px;background:url(/static/img/breadcrumb/breadcrumb_bg.jpg) no-repeat center;background-size:cover;}
	.breadcrumb img{display:none;}
	/*material science */
	.menu_material_science .ul_list,.menu_material_science .menuul{width:28%;}
	.menu_material_science .menu_desc{width:70%;}
}
@media only screen and (max-width:1025px){
	.ul_list li,.or_block_nav li{width:49%;}
	.breadcrumb{min-height:240px;}
}
@media only screen and (max-width:768px){
	.breadcrumb{min-height:210px;}
	/*material science */
	.menu_material_science .ul_list,.menu_material_science .menuul,.menu_material_science .menu_desc{width:100%;}
	.menu_material_science .ul_list,.menu_material_science .menuul{margin:4% 0;}
	.menu_material_science .ul_list li{padding:5px 5px 5px 30px;}
	.menu_material_science .ul_list li span{top:5px;}
}
@media only screen and (max-width:568px){
	.ul_list li,.or_block_nav li{width:100%;}
	.breadcrumb{min-height:180px;}
	/*material science */
	.menu_material_science{padding-top:4%;}
	.menu_material_science p{line-height:26px;font-size:14px;}
	.menu_material_science .ul_list li{padding:0 5px 0 25px;}
	.menu_material_science .ul_list li span{left:10px;top:0;}
}