body {margin:0 auto;overflow:hidden;}  

/*=============第一页=============*/	
.header{
	margin:0 auto;
	width:100%;
	height:640px;
	background-color:#000;
	position:relative;
	}
.header canvas {
	width:100%;height:auto/*默认全屏显示 可自己设置高度640px*/;
	display:inline-block;vertical-align:baseline
	position:absolute;
	z-index:-1;
	}
.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(img/in_top_bj.jpg);
	height:640px;
	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(../images/taisu_logo1.png);
	width: 750px;
	height: 200px;
	position: absolute;
	z-index: 30;
	top: 10px;
	left: 50%;
	margin-left: -390px;
	margin-right: auto;
	margin-bottom: 0;
	}	

.header .nav{
	width: 400px;
	height: auto;
	position: absolute;
	z-index: 30;
	top: 550px;
	left: 50%;
	margin-left: -202px;
	}
.header .nav a.gv {
	text-decoration: none;
	background: url(img/nav_gv.png) repeat 0px 0px;
	width: 196px;
	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;
	color: #0ff;
	font-family: "microsoft yahei";
	font-size: 26px;
	font-weight: normal;
	}
.header .nav a.gv span {
	 display: none;
	 	
}
.header .nav a.gv:hover {
	background: url(img/nav_gv.png) repeat 0px -43px;
	color: #0ff;
	-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;

	}
#demo .canvaszz .home_1 {
	display: block;
	float: left;
	font-family: "微软雅黑";
}
#demo .canvaszz .home_1 .part2 {
	display: block;
	float: left;
	margin-left: 70px;
	margin-top: 60px;
	color: #FFF;
	font-size: 18px;
	font-weight: normal;
}

#demo .canvaszz .home_1 .part1 {
	display: block;
	float: left;
	height: 100px;
	width: auto;
	margin-left: 300px;
	margin-top: 30px;
}
#demo .canvaszz .home_1 .part2 a {
	color: #00ffff;
	text-decoration: none;
}
#demo .topcn span {
	font-size: 40px;
	font-family: "微软雅黑";
	font-weight: bold;
	letter-spacing: 0.5em;
	line-height: 110%;
}
#demo .topcn p {
	font-family: "微软雅黑";
	font-size: 40px;
}
#demo .topcn b {
	font-family: "微软雅黑";
	font-size: 14px;
	letter-spacing: 0.05em;
}