.banner {
	width: 100%;
}

.banner img {
	display: block;
	width: 100%;
}

.main {
	background-color: #f5f5f5;
	padding-top: 100px;
	padding-bottom: 20px;
}

.main ul.case_list li {
	margin-bottom: 80px;
}

.main ul.case_list li:after {
	display: table;
	content: "";
	clear: both;
}

.main ul.case_list li .pic {
	float: left;
}

.main ul.case_list li .pic img {
	display: block;
}

.main ul.case_list li .txt {
	float: right;
	width: 660px;
	height: 500px;
	box-sizing: border-box;
	margin-top: 50px;
	margin-left: -60px;
	background-color: #FFFFFF;
	border-right: 4px solid #202b62;
	padding: 0 80px;
	background-repeat: no-repeat;
	background-position: top 80px right 80px;
}

.main ul.case_list li .txt h5 {
	font-size: 40px;
	font-weight: bold;
	color: #000000;
	line-height: 100px;
	background-image: url(../images/product_title_bg.jpg);
	background-repeat: no-repeat;
	background-position: left bottom;
	margin-top: 90px;
}

.main ul.case_list li .txt p {
	font-family: 'pingfang';
	font-size: 14px;
	color: #333333;
	line-height: 30px;
	padding-top: 22px;
}

.main ul.case_list li.even .pic {
	float: right;
}

.main ul.case_list li.even .txt {
	float: left;
	margin-left: 0px;
	margin-right: -60px;
	border-left: 4px solid #202b62;
	border-right: 0px;
}

.main ul.case_list li:nth-of-type(1) .txt {
	background-image: url(../images/case_i1.png);
}

.main ul.case_list li:nth-of-type(2) .txt {
	background-image: url(../images/case_i2.png);
}

.main ul.case_list li:nth-of-type(3) .txt {
	background-image: url(../images/case_i3.png);
}

.main ul.case_list li:nth-of-type(4) .txt {
	background-image: url(../images/case_i4.png);
}

@media screen and (max-width: 550px ) {
	
	.banner {
		overflow: hidden;
	}
	
	.banner img {
		width: 140%;
		margin-left: -20%;
	}
	
	.main {
		padding-top: 20px;
		padding-bottom: 60px;
	}
	
	.main ul.case_list li {
		margin-bottom: 20px;
	}
	
	.main ul.case_list li .pic img {
		width: 100%;
	}	
	
	.main ul.case_list li .txt {
		width: 100%;
		margin-left: 0px;
		padding: 0 10px;
		background-position: top 20px right 20px;
		height: auto;
		padding-bottom: 20px;
		margin-top: 10px;
	}
	
	.main ul.case_list li .txt h5 {
		margin-top: 0px;
		font-size: 22px;
		line-height: 46px;
		padding-top: 30px;
	}
	
	
	
}