/*product公共部分*/
.product_common{
	width: 100%;
	overflow: hidden;
	background:#fff url(../img/images/about_bg.jpg) no-repeat top center;
	background-size: 100%;
	padding: 60px 0 40px;
	position: relative;
	z-index: 11;
}
.product_common h1{
	font-size: 36px;
	color: #000;
}
/*product独立部分*/
.product_index{
	width: 100%;
	overflow: hidden;
	padding: 35px 0;
}
.product_index li{
	height: auto;
	position: relative;
	cursor: pointer;
}
.border-top{
	width: 0;
	height:3px;
	position: absolute;
	top:0;
	left: 0;
	background-color: #181878;
	transition: all 1s;
}
.border-bottom{
	width: 0;
	height:3px;
	position: absolute;
	bottom:0px;
	right:0px;
	background-color:#181878;
	transition: all 1s;
}
.border-right{
	width: 3px;
	height: 0;
	position: absolute;
	bottom:0px;
	right: 0px;
	background-color: #181878;
	transition: all 1s;
}
.border-left{
	width: 3px;
	height: 0;
	position: absolute;
	top:0px;
	left: -0px;
	background-color: #181878;
	transition: all 1s;
}
.product_index li a.product{
	display: block;
	width: 100%;
	height: 100%;
	overflow: hidden;
	position: relative;
	left: 0px;
	top: 0px;
	z-index: 10;
	padding-bottom: 25px;
	border: 1px solid #dcdddd;
	text-align: center;
}
.product_img{
	width: 100%;
	overflow: hidden;
	margin: 20px 0;
}
.product_img img:last-of-type{
	display: none;
}
.product_index li a.product:hover{
	z-index: 20;
	color: #181878;
}
.product_index li:hover .border-top,.product_index li:hover .border-bottom{
	width: 100%;
}
.product_index li:hover .border-left,.product_index li:hover .border-right{
	height: 100%;
}
.product_index li a.product:hover img:first-of-type{
	display: none;
}
.product_index li a.product:hover img:last-of-type{
	display: block;
	margin: 0 auto;
}
@media only screen and (max-width:767px ) {
	.product_common{
		padding: 30px 0 20px;
	}
	.product_common h1{
		font-size: 24px;
	}
	.product_img img{
		width: 100%;
	}
	.product_index{
		width: 100%;
		overflow: hidden;
		padding: 20px 0;
	}
	.product_index li a.product{
		padding-bottom: 15px;
	}
}
@media only screen and (min-width:768px ) {
	.product_common{
		padding: 40px 0 25px;
	}
	.product_common h1{
		font-size: 36px;
	}
}
@media only screen and (min-width:992px ) {
	.product_common{
		padding: 60px 0 40px;
	}
	.product_common h1{
		font-size: 36px;
	}
}