.header{
    background-color: rgba(24,40,66,0.1);
    /*background-color: #1b2b3b;*/
    position: fixed;
    width: 100%;
    z-index: 3;
    /*position: sticky;*/
}
.header__wrap{
    width: 100%;
    height: 7vh;
}
.header__logo{
    background: url("#")left center no-repeat;
    width: 160px;
    height: 40px;
    background-size: 40px 40px;
    position: absolute;
    font-size: 20px;
    font-weight: bolder;
    color: #fff;
    text-indent: 50px;
    /*text-indent文字缩进距离为logo图片加文字大小*/
    line-height: 40px;
    top: 50%;
    margin-top: -20px;
    left: 20px;
}

.header__nav{
    position: absolute;
    height: 40px;
    right: 30px;
    top: 50%;
    margin-top: -20px;
}
.header__nav__item{
    color: #fff;
    display: block;
    position: relative;
    padding-left: 40px;
    height: 40px;
    font-size: 16px;
    line-height: 40px;
    float: left;
    font-weight: bolder;
}
.header__nav__select__item{
    color: #f01400;
    display: block;
    position: relative;
    padding-left: 40px;
    height: 40px;
    font-size: 16px;
    line-height: 40px;
    float: left;
    font-weight: bolder;
}

.header__nav__item:hover{
    color: #f01400;
}

.header__nav__item--study-now{
    background: #f00;
    text-align: center;
    width: 94px;
    border-radius: 3px;
    padding: 0;
    margin-left: 40px;
}
.header__nav__item--study-now:hover{
    box-shadow:0px 0px 10px #f06;
    transition: all .5s;
    color: white;
}

.header_nav_tip{
    width: 75px;
    height: 2px;
    position: absolute;
    background-color: #f00;
    bottom: 0;
    left: 0;
    transition: all .5s;
    margin-left: 30px;
}

/*container*/
.container{
    width: 1200px;
    height: 960px;
}

/*screen-1*/

.screen-1{
    height: 100vh;
    margin: 0 auto;
    position: relative;

}
.screen-1__practice-courses{
    background: #feda89;
    height: 100%;
    /*background-size: cover;*/
}
.screen-1__heading{
    position: absolute;
    width: 336px;
    font-size: 42px;
    top: 240px;
    left: 50%;
    margin-left: -168px;

}
.screen-1__heading-descrip{
    position: absolute;
    z-index: 1;
    width: 336px;
    left: 50%;
    margin-left: -168px;
    text-align: center;
    top: 318px;
}

/*screen-2*/
.screen-2{
    height: 100vh;
    margin: 0 auto;
    position: relative;
}
.screen-2__practice-courses{
    background:#e5d8d8;
    height: 100%;
    /*background-size: cover;*/
}
.screen-2__heading{
    font-size: 40px;
    line-height: 40px;
    margin-left: 0;
    padding: 0;
    text-align: center;
    margin-top: 90px;
}
.screen-2__sub-heading-tip{
    height: 3px;
    width: 54px;
    background: #f00;
    margin: 32px auto;
}
.screen-2__sub-heading{
    margin: 22px auto;
    padding: 0;
    text-align: center;
}
.screen-2__banner{
    position: relative;
}
.screen-2__banner_i_1{

    width: 750px;
    height: 360px;
    position: absolute;
    left: 50%;
    margin-left: -375px;
    margin-top: 110px;
}
.screen-2__banner_i_2{

    width: 275px;
    height: 380px;
    position: absolute;
    left: 50%;
    margin-left: -137px;
    z-index: 2;
    margin-top: 90px;
}
.screen-2__banner_i_3{

    width: 266px;
    height: 204px;
    position: absolute;
    right: 370px;
    top: 166px;
    z-index: 1;
}

/*screen-3*/
.screen-3{
    height: 100vh;
    /*background-color: #2b333b;*/
    position: relative;
}
.screen-3__practice-courses{
    background: #b3aeae;
    height: 100%;
    /*background-size: cover;*/
}
.screen-3__icon{

    height: 632px;
    width: 570px;
    position: relative;
    margin-left: 120px;
    z-index: 2;
    background-size: cover;
    float: left;
}
.screen-3__content{
    width: 630px;
    height: 640px;
    float: left;
}
.screen-3__content__heading{
    float: left;
    font-size: 36px;
    margin-left: 200px;
    width: 396px;
    margin-top: 230px;
    color: #fff;
}
.screen-3__content__tip{
    height: 2px;
    width: 50px;
    margin-left: 200px;
    background-color: #f01400;
    position: absolute;
    top: 294px;
}
.screen-3__content__subheading{
    color: white;
    position: absolute;
    top: 324px;
    margin-left: 200px;
    font-size: 14px;
    width: 512px;
}
.screen-3__content__items{
    position: absolute;
    margin-top: 456px;
    margin-left: 200px;
    height: 72px;
    width: 512px;
    line-height: 72px;

    /*呼吸灯效果*/
    /* IE10、Firefox and Opera，IE9以及更早的版本不支持 */
    animation-name: breath;                         /* 动画名称 */
    animation-duration: 3s;                         /* 动画时长3秒 */
    animation-timing-function: linear;         /* 动画速度曲线：以低速开始和结束 */
    animation-iteration-count: 3;            /* 播放次数：无限 */

    /* Safari and Chrome */
    -webkit-animation-name: breath;                 /* 动画名称 */
    -webkit-animation-duration: 2s;                 /* 动画时长3秒 */
    -webkit-animation-timing-function: linear; /* 动画速度曲线：以低速开始和结束 */
    -webkit-animation-iteration-count: 2;    /* 播放次数：无限 */
}
@keyframes breath {
    from { opacity: 0.1; }                          /* 动画开始时的不透明度 */
    50%  { opacity:   0.5; }                          /* 动画50% 时的不透明度 */
    to   { opacity: 1; }                          /* 动画结束时的不透明度 */
}

@-webkit-keyframes breath {
    from { opacity: 0.1; }                          /* 动画开始时的不透明度 */
    50%  { opacity:   0.5; }                          /* 动画50% 时的不透明度 */
    to   { opacity: 1; }                          /* 动画结束时的不透明度 */
}
.screen-3__content__items-1{
    color: #2294ff;
    border-radius: 50%;
    border: 4px solid #1f5975 ;
    height: 74px;
    width: 74px;
    display: inline-block;
    text-align: center;
    margin-right: 14px;
}
.screen-3__content__items-2{
    color: #7888fd;
    border-radius: 50%;
    border: 4px solid #7888fd ;
    height: 74px;
    width: 74px;
    display: inline-block;
    text-align: center;
    margin-right: 14px;
}
.screen-3__content__items-3{
    color: #ff6060;
    border-radius: 50%;
    border: 4px solid #6b4146 ;
    height: 74px;
    width: 74px;
    display: inline-block;
    text-align: center;
    margin-right: 14px;
}
.screen-3__content__items-4{
    color: #25c7e5;
    border-radius: 50%;
    border: 4px solid #29535f ;
    height: 74px;
    width: 74px;
    display: inline-block;
    text-align: center;
    margin-right: 14px;
}
.screen-3__content__items-5{
    color: #90bd4b;
    border-radius: 50%;
    border: 4px solid #3e4e40 ;
    height: 74px;
    width: 74px;
    display: inline-block;
    text-align: center;
    margin-right: 14px;
}

/*screen-4*/
.screen-4{
    /*background-color: #f5f3f7;*/
    height: 100vh;
    position: relative;
}
.screen-4__practice-courses{
    background: #68c39f;
    height: 100%;
    /*background-size: cover;*/
}
.screen-4__heading{
    font-size: 42px;
    text-align: center;
    padding-top: 89px;
}
.screen-4__tips{
    height: 2px;
    width: 50px;
    margin: 0 auto;
    background-color: #f01400;
    margin-top: 33px;
}
.screen-4__subheading{
    width: 1200px;
    font-size: 18px;
    margin-top: 30px;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

.screen-4__items{
    margin: 80px auto;
    width: 1200px;
    height: 300px;
}

.screen-4__items-wrap1,
.screen-4__items-wrap2,
.screen-4__items-wrap3,
.screen-4__items-wrap4{
    width: 300px;
    height: 400px;
    float: left;
    text-align: center;
}

.screen-4__items-1-icon{

     height: 72px;
     margin-bottom: 24px;
}

.screen-4__items-2-icon{

    height: 72px;
    margin-bottom: 24px;
}

.screen-4__items-3-icon{

    height: 72px;
    margin-bottom: 24px;
}

.screen-4__items-4-icon{

    height: 72px;
    margin-bottom: 24px;
}




/*screen-5*/
.screen-5{
    width:100%;
    height: 640px;

    background-size: cover;
    position: relative;
}
.screen-5_icon{
    width: 200px;
    height: 200px;
    top: 98px;
    position: absolute;
    left: 50%;
    margin-left: -100px;
}
.screen-5_heading{
    position: absolute;
    font-size: 40px;
    color: white;
    top:358px;
    left: 50%;
    margin-left: -300px;
}
.screen-5_tip{
    height: 2px;
    width: 50px;
    left: 50%;
    margin-left: -25px;
    background-color: #fff;
    position: absolute;
    top: 460px;
}
.screen-5_subheading{
    font-size: 16px;
    color: #fff;
    position: absolute;
    top: 480px;
    left: 50%;
    margin-left: -344px;
}

/*others*/
.screen-others{
    background-color: #fff;
    height: 200px;
    overflow: hidden;
}
.screen-others_btn{
    display: block;
    border: 1px solid #707070;
    width: 238px;
    height: 56px;
    margin-top: 70px;
    margin-left: auto;
    margin-right: auto;
    line-height: 56px;
    text-align: center;
    border-radius: 3px;
    color: black;
}
.screen-others_btn:hover{
    box-shadow:0px 0px 10px rgba(0,0,0,0.5);
    /*给即刻学习体验按钮添加环绕四周阴影,形如'0px 0px 10px',如果0px有值则为按钮有下侧有效果*/
    transition: all .5s;
    /*按钮过渡渐变动画*/
    color: #717171;
}

/*footer*/
.footer{
    background-color: #000;
    height: 108px;
    position: relative;

}
.footer_link{
    position: absolute;
    top: 30px;
    margin-left: 50%;
    left: -348px;
    color: #8fc0c4;
}
.footer_link a{
    color: white;
    margin-right:36px;
    font-size: 12px;
}
.footer_link a:hover{
    color: #f01400;
}
.footer p{
    color: white;
    position: absolute;
    top: 60px;
    font-size: 14px;
    color: #787d82;
    left: 50%;
    margin-left: -244px;
}

/*outline*/
.outline{
    width: 90px;
    height: 130px;
    bottom: 120px;
    box-shadow: 0px 4px 12px 0px rgba(7, 17, 27, 0.1);
    /*outline阴影*/
    border-radius: 3px;
    position: fixed;
    right: 0;
    background-color: white;
}
.outline__nav{
    text-align: center;
    display: block;
    height: 30px;
    line-height: 30px;
    font-size: 15px;
    color: black;

}
.outline__nav:hover{
    color: #f01400;
}

.bmsQrcode {
    width: 285px;
    height: 285px;
    position: relative;
    left: 58vw;
    top: 35vh;
}
/*.bmsQrcode {*/
/*    width: 285px;*/
/*    height: 285px;*/
/*    position: relative;*/
/*    left: 58vw;*/
/*    top: 45vh;*/
/*}*/
.obdQrcode {
    width: 285px;
    height: 285px;
    position: relative;
    left: 58vw;
    top:  35vh;
}
/*.obdQrcode {*/
/*    width: 285px;*/
/*    height: 285px;*/
/*    position: relative;*/
/*    left: 58vw;*/
/*    top:  45vh;*/
/*}*/
.recorderQrcode {
    width: 285px;
    height: 285px;
    position: relative;
    left: 58vw;
    top:  35vh;
}
/*.recorderQrcode {*/
/*    width: 285px;*/
/*    height: 285px;*/
/*    position: relative;*/
/*    left: 58vw;*/
/*    top:  45vh;*/
/*}*/
.iphone{
    width: 280px;
    height: 562px;
    background: url("../img/iphone.png") left bottom no-repeat;
    position: absolute;
    float: left;
    top:20vh;
    left: 30vw;
    background-size:100%;

}
/*.iphone{*/
/*    width: 400px;*/
/*    height: 800px;*/
/*    background: url("../img/iphone.png") left bottom no-repeat;*/
/*    position: absolute;*/
/*    float: left;*/
/*    top:12vh;*/
/*    left: 26vw;*/
/*}*/

.common{
    font-size: large;
    font-weight: bold;
    margin-left: 62vw;
    margin-top: 5vh;
}
.common a:hover
{
    /*background-color: 	#48D1CC;*/
    color: 	#48D1CC;
}
.introduce{
    position: absolute;
    top: 25vh;
    left: 57.2vw;
    font-family:'Microsoft JhengHei';
    font-size: x-large;
    color:#FFFFFF
}
/*.introduce{*/
/*    position: absolute;*/
/*    top: 35vh;*/
/*    left: 57.2vw;*/
/*    font-family:'Microsoft JhengHei';*/
/*    font-size: x-large;*/
/*    color:#FFFFFF*/
/*}*/
.ewm{
    font-family: 微软雅黑;
    font-size:large;
    color:#000000;
    font-weight: bold;
    margin-left: 64vw;
    margin-top:37vh;
    position: relative;
}
#primary {
    z-index: 2000;
    position: fixed;
    top: 50%;
    right: 16px;
    margin-top: -40px;
}
ul {
    list-style: none;
}
#primary li {
    position: relative;
    height: 26px;
    width: 26px;
}
#primary a.active {
    background: url(../img/nav-o.png) no-repeat;
}
#primary a {
    display: block;
    width: 20px;
    height: 20px;
    text-indent: -9999px;
    background: url(../img/nav-c.png) no-repeat;
}

.about{
    position: absolute;
    width: auto;
    height: auto;
    left:35vw;
    top:60vh;
    font-size: 20px;
    font-weight: bolder;
    color: #fff;
}
#bottom{
    position: relative;
    width: auto;
    height: 50px;
    background-color:#708090;
    top:95vh;
}