.container .nav.active{
    background-color: rgba(6, 6, 36, 1);
}

.xiniu_course{
    width: 100%;
    background: rgba(6, 6, 36, 1);
    padding-top: 124px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.course_tit > img{
    height: 42px;
}

.course_tit{
    position: relative;
}

.course_tit::before{
    content: '';
    width: 80px;
    height: 5px;
    background-image: linear-gradient(to right, rgba(255,255,255,0) , rgba(255,255,255,.6));
    position: absolute;
    top: 28px;
    left: -96px;
}

.course_tit::after{
    content: '';
    width: 80px;
    height: 5px;
    background-image: linear-gradient(to right, rgba(255,255,255,6) , rgba(255,255,255,0));
    position: absolute;
    top: 28px;
    right: -96px;
}

.course_tips{
    font-size: 20px;
    font-weight: 500;
    color: #AF8E4F;
    line-height: 28px;
    margin-top: 12px;
    text-align: center;
    width: 1000px;
}

.course_tips.active{
    color: rgba(238, 88, 69, 1);
    font-size: 16px;
}

.course_video_content{
    width: 584px;
    background: #fff;
    border-radius: 16px;
    padding: 12px;
    box-sizing: border-box;
    margin-top: 40px;
    text-align: center;
}

.course_video_content video{
    width: 560px;
    height: 316px;
    border-radius: 16px;
}

.course_group_step{
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 100px 0;
}

.course_video_content > img{
    height: 42px;
    margin: 32px 0 16px 0;
}

.step_item{
    margin-top: 72px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.step_item > p{
    font-size: 22px;
    color: #fff;
    font-weight: 300;
}

.step_item > p span{
    color: rgba(238, 88, 69, 1);
    font-weight: 700;
    padding: 0 4px;
}

.step_item > p span.active{
    font-size: 32px;
    font-style: italic;
}

.step_item_qrcode_content{
    margin-top: 40px;
    width: 248px;
    height: 248px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 16px 16px 16px 16px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.step_item_qrcode_content > img{
    width: 158px;
    height: 158px;
    border-radius: 16px;
    margin-top: 24px;
}

.step_content_btn{
    width: 176px;
    height: 40px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 200px;
    display:flex;
    align-items: center;
    justify-content: center;
    margin: 16px 0;
}


.step_content_btn span{
    color: #FFFFFF;
    margin-right: 4px;
}

.step_content_btn p{
    font-size: 14px;
    font-weight: 500;
    color: #FFFFFF;
    line-height: 22px;
}

.course_pic{
    margin-top: 24px;
    width: 440px;
}

.course_pic1{
    margin-top: 24px;
    width: 220px;
}

.course_items .course_tit{
    margin-bottom: 40px;
    display: inline-block;
}

.course_tit_text1{
    color: #fff;
    font-size: 48px;
    line-height: 56px;
    font-weight: bold;
}

.course_tit_text2{
    color:rgba(6, 6, 36, 1);
    font-size: 40px;
    line-height: 56px;
    font-weight: bold;
    margin-top: 10px;
}

.step_item_pic1{
    display: flex;
    justify-content: center;
    border-radius: 16px;
    margin-top: 40px;
}

.step_item_pic1 img:first-child{
    width: 220px;
    border-radius: 16px 0 0 16px;
}

.step_item_pic1 img:last-child{
    width: 220px;
    border-radius:0 16px 16px 0;
}

.step_item_pic1.active img{
    width: 440px;
    border-radius: 16px;
}

.step_item_pic2{
    width: 300px;
    border-radius: 16px;
    margin-top: 40px;
}

.step_item_pic1.pc img{
    width: 800px;
}

.step_item_pic2.pc{
    width: 800px;
}