html{
	min-width: 1900px;
}

.header{
	width: 100%;
	height: 500px;
	background-image: url(../images/about_bj.jpg);
	background-repeat: no-repeat;
	background-size: cover;
}
.nav_ul li a {
    font-size: 16px;
    color: #fff;
}
.lianxi_span{
	color: #fff;
}
.lianxi_num{
	color: #fff;
}
.nav{
	border-bottom: 1px solid rgba(255,255,255,0.2);
}

.lianxi{
	border-left-color: rgba(255,255,255,0.2);
}

.header_con{
	width: 1200px;
	margin:0px auto;
}
.header_item1{
	padding-top: 115px;
}
.header_span2 .span1{
	font-size: 50px;
	color: #ffffff;
}
.header_span2 .span2{
	font-size: 30px;
	color: #ffffff;
	margin-top: 10px;
	margin-left: 20px;
}
.header_span2 .span3{
	width: 100px;
	height: 1px;
	background-color: #fff;
	margin-left: 20px;
	margin-top: 30px;
}
.header_span2{
	margin-top: 35px;
}
.header_span4{
	margin-top: 35px;
	max-width: 550px;
	font-size: 14.19px;
	color: #ffffff;
	line-height: 1.8;
}
.header_item2{
	margin-top: 275px;
}
.header_span5{
	font-size: 14.19px;
	color: #ffffff;
}

.main_title{
	padding-top: 100px;
	padding-bottom: 75px;
}
.title_span1{
	font-size: 50px;
	color: #333333;
}
.title_span2{
	font-size: 16px;
	color: #333333;
}
.item_title{
	font-size: 26px;
	color: #333333;
}
.item_p{
	font-size: 18px;
	color: #666666;
	line-height: 2;
	max-width: 650px;
	margin-top: 35px;
}
.main_item1{
	height: 500px;
	padding-bottom: 70px;
}
.main_item2{
	height: 605px;
}
.main_item3{
	height: 414px;
}
.item_box{
	position: relative;
}
.main_liucheng{
	position: absolute;
	left: 270px;
	top: 300px;
}

.main1_right{
	position: relative;
}
.mainx-item img{
	max-width: 100%;
}
.main1_right .img1{
	position: absolute;
	right: -180px;
	top: -138px;
}
.main1_right .img2{
	position: absolute;
	right: 0;
	top: -55px;
	z-index: 1;
}
.main1_right .img3{
	position: absolute;
	right: 0;
	top: 345px;
}

.main_item2 .main1_right{
	margin-top: 135px;
}

.main_item3 .main1_left{
	margin-top: 80px;
}
.left_box{
	position: relative;
	z-index: 1;
}
.main3_right{
	position: relative;
}
.main3_right .img1{
	position: absolute;
	right: 0;
	top: -85px;
	z-index: 1;
}
.main3_right .img2{
	position: absolute;
	right: 133px;
	top:334px;
}
.main{
	padding-bottom: 120px;
}