.clearfix:after,
.clearfix li:after {
    display: block;
    clear: both;
    visibility: hidden;
    height: 0;
    overflow: hidden;
    content: ".";
}
.clearfix,
.clearfix li {
    zoom: 1;
}
ul,li{
    list-style: none;
    margin: 0;
}
a{
    text-decoration: none;
}
/*border-box样式*/
.bb{
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}
body,html{
    font:14px/1.5 "微软雅黑","Microsoft YaHei",Helvetica,"Helvetica Neue",Tahoma,Arial,sans-serif;overflow-x: hidden;box-sizing: border-box;width: 100%;
    min-width: 1200px;
    height: -webkit-fill-available;
    height: available;
    min-height: 100%;
    background: url("/show/img/back.jpg") no-repeat;
    background-size: cover;
}

a:focus{
    outline: none;
}
.flex { //
display: box;
    display: -webkit-box;
    /* iOS 6-, Safari 3.1-6 */
    display: -webkit-flex;
    /* Chrome */
    display: -moz-box;
    /* Firefox 19 */
    display: -ms-flexbox;
    display: flex;
}
.fl {
    float: left !important;
}
.fr {
    float: right !important;
}
/*h1,h2,h3,h4,h5{ letter-spacing: 2px;}*/
.main_color{color: #FF8F0B!important;}
/*个人中心头像所在按钮样式改变*/
.link-a{position: absolute;top: 0;left: 0;width: 100%;height: 100%;z-index: 2}
.container{
    width: 1200px;
    min-width: 1200px;
    margin: 0 auto;
    border-radius: 4px;
    position: relative;
}
.head{
    height: 50px;
}

.reg-logo img{
    max-width: 117px;
}

.h-login{
    height: 50px;
    display: flex;
    align-items: center;
    position: relative;
}
.h-login a{
    font-size: 16px;
    color: #606060;
    font-weight: bold;
}
.h-login a:hover{
    color: #FF8F0B;
}
.notice-sum{
    width: 19px;
}

.main{
    width: 100%;
    height: calc( 100vh - 120px );
    position: relative;
    overflow: hidden;
    /* background: url("/show/img/logo-big.png") no-repeat center; */
    background-size: cover;
}
@media screen and (max-width: 769px){
    .main{
        height: inherit;
    }
}
.main>.backimg{
    position: absolute;
    top: 16%;
    left: 0;
    max-width: 100%;
    vertical-align: middle;
    /*z-index: -1;*/
    transition: 0.8s;
    transform-style: preserve-3d;
}
.main .plat-item{
    position: absolute;
    width: 100px;
    height: 100px;
    background-repeat: no-repeat;
    background-size: contain;
    z-index: 1;
}
.main .plat-item>img{
    display: none;
    position: absolute;
    top: -103px;
    left: -103px;
    transform: scale(0.3);
    animation: rotate 3s linear infinite;
    -webkit-animation: rotate 3s linear infinite;
    z-index: 99;
}
.main .plat-item:hover{
    transform: scale(1.2);
    transition: 0.5s;
}

@keyframes rotate {
    0%{
        transform: rotate(0deg) scale(0.7);
    }
    100%{
        transform: rotate(360deg) scale(0.7);
    }
}
@keyframes rotate3d {
    0%{
        transform: rotate3d(1,1,0,0deg);
    }
    100%{
        transform: rotate3d(1,0,0,360deg);
    }
}
.main .plat-item:hover>img{
    /*transform: scale(0.1);*/
    display: block;
}
.main .plat-item:nth-of-type(1){
    top: 24.5%;
    left: 20%;
    background-image: url("/show/img/scratch-round.png");
}


.main .plat-item:nth-of-type(2){
    top: 46.6%;
    left:15%;
    background-image: url("/show/img/codebear-round.png");
}


.main .plat-item:nth-of-type(3){
    top: 66.8%;
    left: 20%;
    background-image: url("/show/img/blockly-round.png");
}

.main .plat-item:nth-of-type(4){
    top: 24.5%;
    left: 71%;
    background-image: url("/show/img/python-round.png");
}

.main .plat-item:nth-of-type(5){
    top: 46.6%;
    left: 76%;
    background-image: url("/show/img/webair-round.png");
}

.main .plat-item:nth-of-type(6){
    top: 66.8%;
    left: 71%;
    background-image: url("/show/img/codeair-round.png");
}