*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}



body{
    min-width: 1200px; 
    color: #333;
    font-family: 
    "????",
    "????",sans-serif;
}
.all{
    max-width: 1920px;
    margin: 0 auto;
}

ul,ol{list-style-type:none;} 
a{text-decoration:none;}
img {
    border: none;
    vertical-align: middle;
}
.clearfix:after {
    content: ".";
    display: block;
    height: 0;
    font-size: 0;
    clear: both;
    visibility: hidden;
    }
    .clearfix {
    zoom: 1;
    }
.inline{
    display: inline;
}
.inline-block{
    display: inline-block;
}
.fl{
    float: left
}

.fr{
    float: right
}
.wth1200{
    width: 1200px;
    margin: 0 auto;
}

.nav_wrap{
    width: 100%;
    height: 60px;
    overflow: hidden;
    background-color: #444444;
    color: #ffffff;
    box-shadow: 1px 2px 8px 0px rgba(36, 45, 57, 0.19);
}
.nav{
    width: 1200px;
    height: 60px;
    line-height: 60px;
    margin: 0px auto;
    /* overflow: hidden; */
    box-sizing: border-box;
}
.nav .head_logo{
    float: left;
    margin-right: 30px;
}
.nav .head_logo img{
    height: 30px;
    margin-bottom: 2px;
}
.head_nav{
    float: left;
}
.head_nav a{
    display: inline-block;
    margin: 0 15px;
    /*color: #666666;*/
    color: #ffffff;
}
.head_nav a:hover{
    color: #4197ea;
}
.nav .login_wrap{
    float: right;
}

.demo{
    min-width: 1200px;
}
.banner_top{
    width: 100%;
    height:auto ;

}
.warp{
    width: 1200px;
    min-width:1200px ;
    margin: auto;
    /* padding-bottom: 1000px; */
    overflow: hidden;
}
.title{
    width: 465px;
    height: 62px;
    margin: auto;
    font-size: 28px;
    font-family: Microsoft YaHei;
    font-weight: 400;
    color: #333333;
    line-height: 17px;
    margin-top: 90px;
    margin-bottom: 67px;
    position: relative;
}
.title_bg{
    background: url('../images/bg.png')no-repeat center;
}
.bottom_border{
    position: absolute;
    width: 30px;
    height: 3px;
    background: #82191D;
    bottom: 0;
    left: 50%;
    margin-left: -15px;
}
.topic{
   overflow: hidden;
}
.topic_item{
    width: 49%;
    height: 100%;
    border-bottom: 11px solid #E5E8EB;
    margin-bottom: 34px;
    float: left;
    /* clear:both; */
}
.topic_left{
    margin-right: 2%;
}
.topic_bg{
    width: 100%;
    height: 204px;
    background: url('../images/course_bg1/bg1.png')no-repeat center;
    position: relative;
}
.topic_bg2{
    background: url('../images/course_bg1/bg2.png')no-repeat center;
}
.topic_bg3{
    background: url('../images/course_bg1/bg3.png')no-repeat center;
}
.topic_bg4{
    background: url('../images/course_bg1/bg4.png')no-repeat center;
}
.topic_cloud{
    width: 100%;
    height: 100%;
    position: absolute;
    background: rgba(0, 0, 0, 0.5);
    left: 0;
    top: 0;
}
.topic_subject{
    width: 100%;
    height: 64px;
    background:rgba(130, 25, 29, 0.85);
    position: absolute;
    bottom: 0;
    left: 0;
    text-align: center;
    line-height: 64px;
    font-size: 20px;
    font-family: Microsoft YaHei;
    font-weight: bold;
    color: #FFFFFF;
}
.topic_content{
    padding: 40px 25px 25px 25px;
}
.content_title{
    font-size: 18px;
    font-family: Microsoft YaHei;
    font-weight: bold;
    color: #82191D;
    line-height: 28px;
}
.content_warp{
    font-size: 14px;
    font-family: Microsoft YaHei;
    font-weight: 400;
    color: #333333;
    line-height: 22px;
    margin-top: 28px;
}
.content_time{
    font-size: 14px;
    font-family: Microsoft YaHei;
    font-weight: 400;
    color: #B6864A;
    line-height: 21px;
    margin-top: 36px;
}
.title2{
    margin-top: 79px;
}
.courseList{
    display: flex;
/*    justify-content: space-between;*/
    flex-wrap: wrap;
}
.courseItem{
    margin-bottom: 43px;
    width: 20%;
}
.courseItem img{
    width:205px;
    height: 134px;
}
/*.courseList:after{
    content: "";
    height: 0;
    width:38%;
}
#course-3:after{
    content: "";
    height: 0;
    width:59%;
}
#course-6:after{
    content: "";
    height: 0;
    width:17%;
}*/
.banner1{
    width: 100%;
    height: 333px;
    background: url('../images/banner1.png')no-repeat center;
    margin-top: 35px;
}
.banner2{
    width: 100%;
    height: 778px;
    background: url('../images/banner2.png')no-repeat center;
}
.message{
    width: 211px;
    font-size: 14px;
    font-weight: 400;
    color: #333333;
    margin: auto;
    margin-bottom: 67px;
}
.subtitle{
    width: 439px;
    height: 34px;
    margin: auto;
    background: url('../images/title_bg.png')no-repeat center;
    text-align: center;
    line-height: 34px;
    font-size: 14px;
    font-family: Microsoft YaHei;
    font-weight: 400;
    color: #82191d;
    margin-bottom: 45px;
    background-size: 100%;
    height: 100%;
}