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

/*=============第一页=============*/	
.header{display: block;
	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;
	}


.header .top_logo{
	background-image: url(img/top_logo.png);
	margin:0 auto;
	width:750px;
	height:200px;
	position:absolute;
	z-index:30;
	top:10px;
	left: 50%;
	margin-left: -390px;
	}	

.header .nav{
	width:804px;
	height:auto;
	position:absolute;
	z-index:30;
	top:420px;
	left: 50%;
	margin-left: -400px;
	}
.header .nav a.gv { 
	text-decoration:none; 
	background:url(img/nav_gv.png) repeat 0px 0px; 
	width: 130px; 
	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:#066197;
	}
.header .nav a.gv span {
	 display: none;
	 	
}
.header .nav a.gv:hover { 
	background: url(img/nav_gv.png) repeat 0px -43px; 
	color:#1d7eb8;
	-webkit-box-shadow: 0 0 6px #1d7eb8;
	transition-duration: 0.5s;
	}
	
.header	.topcn{
	width: 1202px;left: 45%;
	margin-left: -490px;
	position:absolute;
	z-index:20;

	}


body {
    background:#eee;
    margin:0;
    padding:0;
}
#nav{
	width: 700px;
	margin: 20px auto;
	height: 45px;
	background: cornflowerblue;
	border-radius: 50px;
	padding-top: 11px;
	box-shadow: 0 4px 4px 2px #000;
}
#nav li{
	float: left;
	list-style: none;
	text-align: center;
	height: 50px;
	width:80px;
	padding:8px 10px ;

}
#nav a {
    font-weight:bold;
    color:#f4f4f4;
    text-decoration:none;
    display:block;
    border-radius:10px; /*some css3*/
    -moz-border-radius:10px;
    -webkit-border-radius:10px;
    text-shadow:0 1px 1px #000;
}
#nav li:hover > a {
    background:#f4f4f4 repeat-x 0 -20px;
    color:#000;
    border-top:1px solid #f8f8f8;
    box-shadow:0 2px 2px rgba(0,0,0, .7); /*some css3*/
    -moz-box-shadow:0 2px 2px rgba(0,0,0, .7);
    -webkit-box-shadow:0 2px 2px rgba(0,0,0, .7);
    text-shadow:0 2px 2px rgba(255,255,255, 0.7);
}
#nav ul li:hover a, #nav li:hover li a {
    background:none;
    border:none;
    color:#000;
}
#nav ul li a:hover {
    background:#335599 repeat-x 0 -100px;
    color:#fff;
    border-radius:10px; /*some css3*/
    -moz-border-radius:10px;
    -webkit-border-radius:10px;
    text-shadow:0 2px 2px rgba(0,0,0, 0.7);
}
#nav ul li:first-child > a {
    -moz-border-radius-topleft:10px; /*some css3*/
    -moz-border-radius-topright:10px;
    -webkit-border-top-left-radius:10px;
    -webkit-border-top-right-radius:10px;
}
#nav ul li:last-child > a {
    -moz-border-radius-bottomleft:10px; /*some css3*/
    -moz-border-radius-bottomright:10px;
    -webkit-border-bottom-left-radius:10px;
    -webkit-border-bottom-right-radius:10px;
}
#nav li:hover > ul {
    opacity:1;
    visibility:visible;
}
#nav ul {
    opacity:0;
    visibility:hidden;
    padding:0;
    width:120px;
    position:absolute;
    background:#aabbcc repeat-x 0 0;
    border:1px solid #7788aa;

    border-radius:10px; /*some css3*/
    -moz-border-radius:10px;
    -webkit-border-radius:10px;
    box-shadow:0 2px 2px rgba(0,0,0, .5);
    -moz-box-shadow:0 2px 2px rgba(0,0,0, .5);
    -webkit-box-shadow:0 2px 2px rgba(0,0,0, .5);

    -moz-transition:opacity .25s linear, visibility .1s linear .1s;
    -webkit-transition:opacity .25s linear, visibility .1s linear .1s;
    -o-transition:opacity .25s linear, visibility .1s linear .1s;
    transition:opacity .25s linear, visibility .1s linear .1s;
}
#nav ul li {
    float:none;
    margin:0;
}
#nav ul a {
    font-weight:normal;
    text-shadow:0 2px 2px rgba(255,255,255, 0.7);
}
#nav ul ul {
    left:0px;
    top:0px;
}
#bottom{
	width: 1202px;
	height: 100%px;
	text-align: center;
}
.nav .head .nav ul{width:1202px; height:41px;}
.nav ul li,.head .nav ul li a{width:120px; height:41px; float:left;}
.nav ul li .nav-1{background:#0d5d93;}
.nav ul li a{display:block; color:#FFF; background:#276fal; text-align:center; line-height:41px; font-weight:600;}
.nav ul li a:hover{background:#0d5d93;}


</style>