.nav_child .nav_item {
    position: absolute;
    top: 100%;
    width: 1200px;
    background: rgb(255, 255, 255, 0.8);
    opacity: 0;
    visibility: hidden;
}

.nav_child .nav_item .nav_item_img{
    height: 250px;
}

/* 单位概况 */
.nav_child .nav_item .nav_item_img_201{
    background:url(../img/gaikuang-imgs.png) left bottom no-repeat;
    background-size: contain;
}

/* 部门介绍 */
.nav_child .nav_item .nav_item_img_274{
    background:url(../img/bumen-imgs.png) left bottom no-repeat;
    background-size: contain;
}

/* 技术开发 */
.nav_child .nav_item .nav_item_img_203{
    background:url(../img/jishu-imgs.png) left bottom no-repeat;
    background-size: contain;
}

/* 企业发展 */
.nav_child .nav_item .nav_item_img_204{
    background:url(../img/qiye-imgs.png) left bottom no-repeat;
    background-size: contain;
}

/* 研究生教育 */
.nav_child .nav_item .nav_item_img_205{
    background:url(../img/yanjiusheng-imgs.png) left bottom no-repeat;
    background-size: contain;
}

/* 教育培训 */
.nav_child .nav_item .nav_item_img_206{
    background:url(../img/jiaoyu-imgs.png) left bottom no-repeat;
    background-size: contain;
}

/* 公共技术服务 */
.nav_child .nav_item .nav_item_img_336{
    background:url(../img/bumen-imgs.png) left bottom no-repeat;
    background-size: contain;
}

/* 人才招聘 */
.nav_child .nav_item .nav_item_img_208{
    background:url(../img/rencai-imgs.png) left bottom no-repeat;
    background-size: contain;
}

/* 党建园地 */
.nav_child .nav_item .nav_item_img_209{
    background:url(../img/dangjian-imgs.png) left bottom no-repeat;
    background-size: contain;
}

/* 公共服务 */
.nav_child .nav_item .nav_item_img_207{
    background:url(../img/gonggongfuwu-imgs.png) left bottom no-repeat;
    background-size: contain;
}

.nav_child .nav_item.s {
    visibility: visible;
    opacity: 1;
    transition: opacity 0.2s ease-out 0s;
}

.nav_child .nav_item .l {
    display: -ms-flexbox;
    width: 45%;
    float: left;
    overflow: hidden;
}

.nav_child .nav_item .l .pic {
    width: 142px;
    display: inline-block;
}

.nav_child .nav_item .l .pic img {
    width: 100%;
    height: auto;
}

.nav_child .nav_item .l .txt {
    font-size: 16px;
    color: #2270ba;
    /*padding-left: 30px;*/
    line-height: 2.2;
    float: right;
    width: 57%;
   
}

.nav_child .nav_item .r {
    width: 45%;
    font-size: 0;
    float: right;
    padding: 20px;
}

.nav_child .nav_item .r a {
    width: 50%;
    font-size: 18px;
    margin-top: 10px;
    display: inline-block;
    color: #666;
}

.nav_child .nav_item .r a:hover {
    color: #2270ba;
}

.nav_hidden_background {
    position: absolute;
    top: 100%;
    width: 1200px;
    height: 250px;
    background: url(../img/lucency_bg.png) no-repeat;
    opacity: 0;
    visibility: hidden;
    z-index: -1;
}

.nav_hidden_background.show {
    visibility: visible;
    opacity: 1;
    transition: opacity 0.2s ease-out 0s;
}

.header2 {
    position: relative;
    left: 0;
    right: 0;
    z-index: 99;
    opacity: 0;
    transform: translateY(-100%);
    transition: all 0.5s ease-out 0s;
}

.body_b.showdiv .header2 {
    transition: all 0.7s ease-in-out 0.5s;
    transform: none;
    opacity: 1;
    background: #1c7cdf;
}

.header2.showdiv {
    opacity: 1;
    transform: none;
}

.header2 .d2 {
    transition: all 0.3s ease-out 0s;
    height: 61px;
    width: 1200px;
    display: block;
    margin:  0 auto;
}

.header2 .block {
    position: relative;
    height: 100%;
}

.header2 .nav_main {
    text-align: center;
    font-size: 18px;
    float: right;
    line-height: 61px;
}

.header2 .nav_main a {
    padding: 0 13.66px;
    display: inline-block;
    position: relative;
    color: #fff;
    height: 60px;
    /*line-height: 60px;*/
}
.header2 .nav_main a:hover{
    background: #2270ba;
}

.nav_main_select{
    background: #2270ba;
    height: 60px;
    padding: 0 20px;
    display: inline-block;
    line-height: 60px;
    font-size: 18px;
    color: #fff;
}
.nav_main_select:hover{
    color: #fff;
}

.header2 .nav_main a:after {
    content: "";
    margin-top: 5px;
    display: block;
    width: 100%;
    transition: all 0.2s ease-out 0s;
    transform: scaleX(0);
}

.header2 .nav_main a:before {
    content: "";
    height: 25px;
    transition: all 0.2s ease-out 0s;
    transform: scaleY(0);
    position: absolute;
    left: 50%;
    top: 100%;
    transform-origin: center top;
}

.header2 .nav_main a.hover:before {
    transform: none;
}

.header2 .nav_main a.hover:after {
    transform: none;
}

.header2 .nav_main a.now:after {
    transform: none;
}