/*=============绗竴椤�=============*/
.header{
	margin:0 auto;
	width:100%;
	height:490px;
	background-color:#000;
	position:relative;
	}
.header canvas {
	width:100%;height:490px/*榛樿鍏ㄥ睆鏄剧ず 鍙嚜宸辫缃珮搴�640px*/;
	display:inline-block;vertical-align:baseline
	position:absolute;
	z-index:-1;
	}
.header .canvaszz{  /*鐢ㄦ潵瑙ｅ喅瑙嗛鍙抽敭鑿滃崟锛岀敤浜庤棰戜笂闈㈢殑閬僵灞�*/
	width:100%;
	background-image: url(../images/in_top_bj.jpg);
	height:490px;
	position:absolute;
	z-index:10;
		filter:alpha(opacity=40);  
      	-moz-opacity:0.4;  
      	-khtml-opacity: 0.4;  
      	opacity: 0.4;
	}

.audio{ 
/*璁剧疆闊充箰鏄剧ず浣嶇疆*/
	width:45px;
	position:fixed;top:65px;left:94%;
	z-index:100;
	filter:alpha(opacity=30);  
      -moz-opacity:0.3;  
      -khtml-opacity: 0.3;  
      opacity: 0.3;
	}
.header .top_logo{
	background-image: url(../images/Alpha_top_logo.png);
	margin:0 auto;
	width:750px;
	height:200px;
	position:absolute;
	z-index:30;
	top:30px;
	left: 54%;
	margin-left: -390px;
	}	
.header .top_logo .click{
	width:100%;
	height:100%;
	display:block;
}
.header .nav{
	width:940px;
	height:auto;
	position:absolute;
	z-index:30;
	top:270px;
	left: 50%;
	margin-left: -430px;
	}
.header .nav a.gv { 
	text-decoration:none; 
	background:url(../images/nav_gv2.png) repeat 0px 0px;
	width: 150px; 
	height: 40px; 
	display: block; 
	text-align:center;		/*姘村钩灞呬腑*/
	line-height:40px;  /*涓婁笅灞呬腑*/
	cursor:pointer;
	float:left;/*宸︽诞鍔�*/
	margin:8px 35px 8px 2px;
	font:20px/40px 'microsoft yahei'; color:#066197;
	}
.header .nav a.gv span {
	 display: none;
	 	
}
.header .nav a.gv:hover { 
	background: url(../images/nav_gv2.png) repeat 0px -40px; 
	color:#1d7eb8;
	-webkit-box-shadow: 0 0 6px #1d7eb8;
	transition-duration: 0.5s;
	}
	
.header	.topcn{
	width: 980px;
	top:200px;
	left: 50%;
	margin-left: -490px;
	position:absolute;
	z-index:20;

	}

@media (min-width: 100px) and (max-width:767px){
	.header{
		margin:0 auto;
		width:100%;
		height:173px;
		background-color:#000;
		position:relative;
	}
	.header canvas {
		width:100%;height:173px/*榛樿鍏ㄥ睆鏄剧ず 鍙嚜宸辫缃珮搴�640px*/;
		display:inline-block;vertical-align:baseline
		position:absolute;
		z-index:-1;
		}
	.header .canvaszz{  /*鐢ㄦ潵瑙ｅ喅瑙嗛鍙抽敭鑿滃崟锛岀敤浜庤棰戜笂闈㈢殑閬僵灞�*/
		width:100%;
		background-image: url(../images/in_top_bj.jpg);
		height:173px;
		position:absolute;
		z-index:10;
			filter:alpha(opacity=40);  
			-moz-opacity:0.4;  
			-khtml-opacity: 0.4;  
			opacity: 0.4;
		}

	.audio{ 
	/*璁剧疆闊充箰鏄剧ず浣嶇疆*/
		width:45px;
		position:fixed;top:65px;left:94%;
		z-index:100;
		filter:alpha(opacity=30);  
		  -moz-opacity:0.3;  
		  -khtml-opacity: 0.3;  
		  opacity: 0.3;
		}
	.header .top_logo{
		background: url(../images/Alpha_top_logo.png) no-repeat;
		background-size:450px 140px;
		margin:0 auto;
		width:750px;
		height:90px;
		position:absolute;
		z-index:30;
		top:0px;
		left: 87%;
		margin-left: -350px;
		}	
	.header .top_logo .click{
		width:100%;
		height:100%;
		display:block;
	}
	.header .nav{
		/**/
		width:100%;
		height:40px;
		position:absolute;
		z-index:30;
		top:90px;
		left: 100%;
		margin-left: -310px;
		}
	.header .nav a.gv { 
		text-decoration:none; 
		
		background:url(../images/nav_gv3.png) repeat 0px 0px;
		
		width: 50px; 
		height: 30px; 
		display: block; 
		text-align:center;		/*姘村钩灞呬腑*/
		line-height:30px;  /*涓婁笅灞呬腑*/
		cursor:pointer;
		float:left;/*宸︽诞鍔�*/
		margin:8px 2px 8px 2px;
		font:7px/30px 'microsoft yahei'; color:#066197;
		}
	.header .nav a.gv span {
		 display: none;
			
	}
	.header .nav a.gv:hover { 
		
		background: url(../images/nav_gv3.png) repeat 0px -30px; 
		
		color:#1d7eb8;
		-webkit-box-shadow: 0 0 6px #1d7eb8;
		transition-duration: 0.5s;
		}
		
	.header	.topcn{
		width: 980px;
		top:200px;
		left: 50%;
		margin-left: -490px;
		position:absolute;
		z-index:20;

		}
}