*{
	margin: 0;
	padding: 0;
}
html,body{
	height: 100%;
	width: 100%;
	overflow-x: hidden;
}
body {margin:0 auto;}  

/*=============第一页=============*/	
.header{
	margin:0 auto;
	width:100%;
	height:100%;
	background-color:#000;
	position:relative;
	}
.header canvas {
	width:100%;
	height:100%;
	display:inline-block;
	}
.header .canvaszz{  /*用来解决视频右键菜单，用于视频上面的遮罩层*/
	width:100%;
	background-image: url(/css/img/in_top_bj.jpg);
	height:100%;
	position:absolute;
	z-index:10;
		filter:alpha(opacity=40);  
      	-moz-opacity:0.4;  
      	-khtml-opacity: 0.4;  
      	opacity: 0.4;
	}

.audio{ 
/*设置音乐显示位置*/
	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(/css/img/top_logo.png);
	margin:0 auto;
	width:500px;
	height:500px;
	background-size: 100% 100%;
	position:absolute;
	z-index:30;
	top:20px;
	left: 50%;
	margin-left: -250px;
	}	
	.header .top_logo img{
		width: 100%;
		height:100%;
	}
.header .nav{
	width: 680px;
    height: auto;
    position: absolute;
    z-index: 30;
    top: 530px;
    left: 50%;
    margin-left: -340px;
	}
.header .nav a.gv { 
	text-decoration:none; 
	height: 43px; 
	display: block; 
	text-align:center;		/*水平居中*/
	line-height:43px;  /*上下居中*/
	cursor:pointer;
	float:left;/*左浮动*/
	margin:8px 2px 8px 2px;
	font:18px/43px 'microsoft yahei'; color:#ffffff;
	}
.header .nav a.gv span {
	 display: none;
	 	
}
.header .nav a.gv:hover { 
	background: url(/css/img/nav_gv.png) repeat 0px -43px;
	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;

	}
.span-gv a {
	border:1px solid #00b2ff;
	padding: 0px 20px;
}

@media (max-width: 600px) {
	.header .top_logo{
		top:16%;
	width:300px;
	height:300px;
	margin-left: -150px;
	}
	.header .nav{
		min-width: 360px;
		top: 60%;
		left: 50%;
		margin-left: -180px;
	}
	.header .nav a.gv {
		font-size: 12px;
		padding: 3px;
		height: 30px;
		line-height: 30px;
	}
	
}