.head_b{background-color: #333436;  position: fixed;    width: 100%;    height: 45px; z-index: 10;}
.head_top{margin:0 auto; overflow:hidden; height:45px; line-height:45px; color:#999999; font-size:13px;}
.head_top a{color:#999999}
.head_top ol{ float:left; width:400px}
.head_top ul{ float:right; width:566px;}

.head_top ul a {margin:0 5px; background: url(../images/head_top_ioc1.png) no-repeat left 12px ; width:auto; height:45px; display:inline-block ; padding-left:25px; }
.head_top ol li{ float:left; width:60px;}
.head_top ol li a{ margin-right:10px;}
.head_top ul li{ float:left; margin-left:10px;}
.head_top ul li:nth-of-type(1) a{background: url(../images/head_top_ioc1.png) no-repeat left 12px ;}
.head_top ul li:nth-of-type(2) a{background: url(../images/head_top_ioc2.png) no-repeat left 12px ;}
/*.head_top ul li:nth-of-type(3) a{background: url(../images/head_top_ioc3.png) no-repeat left 12px ;}*/
.head_top ul li:nth-of-type(3) a{background: url(../images/head_top_ioc4.png) no-repeat left 12px ;}
.head_top ul li b{ color:#ffa317; font-size:20px;}
.head_nav{    padding-top: 45px;background-color: #fff;}
.head_nav .logo{ width:190px; float:left; margin:10px 0 0 0px;}
.head_nav .logo img{transition: all 0.5s ease 0s;}
.head_nav .logo:hover img { transform: scale(0.9); }

.head_nav dl{ margin:20px 0; float:left;border-right: 1px solid #e5e5e5;padding: 0 10px 0 20px;}
.head_nav dl dt{ line-height:35px; height:50px;}
.head_nav dl dt img{margin-right: 7px;position: relative;}
.head_nav dl dt a{font-size: 16px; font-weight: 700;}
.head_nav dl dd a{float: left;margin-right: 15px; margin-bottom: 15px;}
.head_nav dl dd{ float:left;}
.head_nav dl:nth-of-type(1) {width: 142px;}
.head_nav dl:nth-of-type(2) {width: 170px;}
.head_nav dl:nth-of-type(3) {width: 170px;}
.head_nav dl:nth-of-type(4) {width: 170px;}
.head_nav dl:nth-of-type(5) {width: 175px;border-right:0;}
.head_nav .nav_dl_1 dt{}