/* 屏幕小于1920px */
@media screen and (max-width: 1920px) {
    .qq-group{
        font: normal bold 30px/36px 仿宋 ;
        width: 15%;
        height: 9%;
        top: 30%;
        right: 33%;
    }

    .box_tip{
        margin: 10px 0;
        font-size: 24px !important;
    }

    .box_tit h3 {
        display: block;
    }

    .brief-introduction .wn-download{
        display: flex;
    }

    .brief-introduction .text-p{
        width: 100%;
    }

    .brief-introduction .red-finger{
        margin: 20px auto 20px auto;
        grid-template-columns: repeat(1, 100%);
        /* grid-template-columns: repeat(3, 33%); */
    }

    .brief-introduction .red-finger .down-img{
        display: block;
    }

    .header .header-common-padding{
        padding: 0px 50px;
    }

    .header .header-common-padding2{
        padding: 0px 25px;
    }

    .header .logo a{
        font-size: 22px;
    }
    
    .header .wn-link a{
        padding: 0 10px;
        font-size: 14px;
    }

    .header .wn-link2{
        margin: 10px 20px 0 0;
    }

    .header .wn-link2 a{
        padding: 0 5px;
        font-size: 14px;
    }

    .course_tab_css{
        display: none;
        width: 1024px;
        min-height: calc(100vh - 65px - 85px);
    }
    
}

@media screen and (max-width: 1024px) {
    .qq-group{
        font: normal bold 24px/28px 仿宋 ;
        width: 23%;
        height: 5%;
        top: 22%;
        right: 18%;
    }

    .box_tip{
        margin: 10px 0;
        font-size: 22px !important;
    }

    .box_tit h3 {
        display: block;
    }

    .brief-introduction .wn-download{
        display: flex;
    }

    .brief-introduction .text-p{
        width: 100%;
    }

    .brief-introduction .red-finger{
        margin: 20px auto 20px auto;
        grid-template-columns: repeat(3, 33%);
    }


    .brief-introduction .red-finger .down-img{
        display: block;
    }

    .header .header-common-padding{
        padding: 0px 50px;
    }

    .header .header-common-padding2{
        padding: 0px 20px;
    }

    .header .logo a{
        font-size: 22px;
    }
    
    .header .wn-link a{
        padding: 0 5px;
        font-size: 16px;
    }

    .header .wn-link2{
        margin: 10px 20px 0 0;
    }

    .header .wn-link2 a{
        padding: 0 5px;
        font-size: 14px;
    }

    .course_tab_css{
        display: none;
        width: 1024px;
        min-height: calc(100vh - 65px - 85px);
    }
}

@media screen and (max-width: 800px) {
    .qq-group{
        font: normal bold 24px/28px 仿宋 ;
        width: 25%;
        height: 7%;
        top: 28%;
        right: 13%;
    }

    .box_tip{
        margin: 5px 0;
        font-size: 18px !important;
    }

    .box_tit h3 {
        display: none;
    }

    .brief-introduction .wn-download{
        display: none;
    }

    .brief-introduction .text-p{
        width: 90vw;
    }

    .brief-introduction .red-finger{
        margin: 0px auto;
        grid-template-columns: repeat(1, 90vw);
    }

    .header .header-common-padding,.header .header-common-padding2{
        padding: 0px;
    }

    .header .logo a{
        font-size: 18px;
    }

    .header .logo a span{
        display: none;
    }
    
    .header .wn-link a{
        padding: 0 4px;
        font-size: 14px;
    }

    .header .wn-link2{
        margin: 5px 10px 0 0;
    }

    .header .wn-link2 a{
        padding: 0 5px;
        font-size: 12px;
    }

    .course_tab_css{
        display: none;
        width: 100%;
        height: 100%;
    }
}

@media screen and (max-width: 600px) {
    .qq-group{
        font: normal bold 18px/24px 仿宋 ;
        width: 180px;
        height: 55px;
        top: 22%;
        right: 5%;
    }

    .box_tip{
        margin: 0;
        font-size: 14px !important;
    }

    .box_tit h3 {
        display: none;
    }

    .brief-introduction .wn-download{
        display: none;
    }

    .brief-introduction .text-p{
        width: 90vw;
    }

    .brief-introduction .red-finger{
        margin: 0px auto;
        grid-template-columns: repeat(1, 90vw);
    }

    .header .header-common-padding,.header .header-common-padding2{
        padding: 0px;
    }

    .header .logo a{
        font-size: 18px;
        
    }
    .header .logo a span{
        display: none;
    }
    
    .header .wn-link a{
        padding: 0 2px;
        font-size: 14px;
    }

    .header .wn-link2{
        margin: 0px 5px 0 0;
    }

    .header .wn-link2 a{
        padding: 0 2px;
        font-size: 10px;
    }

    .course_tab_css{
        display: none;
        width: 100%;
        height: 100%;
    }
}

@media screen and (max-height: 800px) {
    .qq-group{
        font: normal bold 18px/24px 仿宋 ;
        width: 150px;
        height: 55px;
        top: 27%;
        right: 5%;
    }

    .box_tip{
        margin: 0;
        font-size: 14px !important;
    }

    .box_tit h3 {
        display: none;
    }

    .brief-introduction .wn-download{
        display: none;
    }
}

body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,form,fieldset,input,textarea,p,blockquote,th,tr,td,section,a,input,span{
    margin:0;
    padding:0;
}

html {
  height: 100%;
}

body{
  min-height: 100%;
  display: flex;
  flex-direction: column;
}

/* 页面整体布局最大宽度 */
.common-max-width{
    max-width: 1024px;
}

#content{
    margin: auto;
    flex: 1;
}

a{
    text-decoration:none
}

.header{
    background-color: #000;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
}

.header .logo a{
    display: flex;
    /* font-size: 22px; */
    align-items: center;
    color: white;
}
.header .logo img{
    margin: 0 10px;
    height: 40px;
}

.header .logo .course-img{
    margin: 0 5px;
    height: 40px;
}

.header .wn-link{
    margin: 10px 20px 0 0;
}

.header .wn-link a,.header .wn-link2 a{
    /* padding: 0 10px; */
    /* font-size: 15px; */
    font-family: Arial, Helvetica, sans-serif;
    align-items: center;
    color: white;
}

.carousel {
    position: relative;
    overflow: hidden;
}
 
.carousel-slide {
    display: none;
    position: absolute;
    width: 100%;
    transition: opacity 1s ease;
}
 
.carousel-slide img {
    width: 100%;
}

.body-img{
    width: 100vw;
}

.brief-introduction{
    grid-template-columns: 100%;
    margin: 0 15px;
    font-size: 14px;
    color: grey;
    display: grid;
    align-items: center;
}

.brief-introduction .text-p{
    display: grid;
    align-items: center;
    grid-template-rows: repeat(3, 60px);
    font-size: 16px;
}
.brief-introduction .text-p p{
    text-align: center;
}

.brief-introduction .text-p a{
    text-align: center;
    padding-top: 10px;
    font-size: 24px;
    font-family: Arial, Helvetica, sans-serif;
    align-items: center;
    color: rgb(90, 90, 211);
}

.brief-introduction .wn-download{
    width: 220px;
    justify-content: center;
    margin: 0 auto;
}

.brief-introduction .red-finger{
    width: 100%;
    display: grid;
    text-align: center;
    justify-items: center;
    font-size: 16px;
}

.brief-introduction .red-finger .down-img{
    width: 220px;
    margin: 0 auto;
}

.download ul{
    margin-top: 10px;
    display: grid;
    align-items: center;
    grid-template-rows: repeat(1, 80px);
    list-style:none;
}

/* .download ul .li-1{
    justify-self: center;
} */

.download ul .li-2{
    line-height: 45px;
    font-size: 14px;
}

.download ul .li-2 a{
    display: flex;
    align-items: center;
    color: #1E90FF;
}

.button-down{
    padding: 0px 0px 0px 38px;
    border-width: 2px; /* 边框宽度 */
    border-color: #1E90FF;
    border-radius: 10px; /* 边框半径 */
    background: #1E90FF; /* 背景颜色 */
    cursor: pointer; /* 鼠标移入按钮范围时出现手势 */
    outline: none; /* 不显示轮廓线 */
    font-family: Microsoft YaHei; /* 设置字体 */
    color: white; /* 字体颜色 */
    display: flex;
    align-items: center;
    justify-self: center;
}

.button-down img{
    margin-right: 5px;
    height: 20px;
    width: 20px;
}

.button-1{
    margin: 0 10px 0 10px;
    width: 200px;
    height: 50px;
    font-size: 15px; /* 字体大小 */
}

.button-2{
    margin: 10px 10px 10px 10px;
    width: 200px;
    height: 50px;
    font-size: 15px; /* 字体大小 */
}

.button-2 img{
    margin-right: 10px;
}

.img-2{
    margin: 0 20px 0 30px;
    height: 23px;
}

.qq-group{
    position: absolute;
    text-align: center;
    padding-top: 10px;
    color: white;
    background-image: linear-gradient( #82A2FF,#7949F5);
    border-radius: 10px;
}

/* tab页默认隐藏 */
.tab_css {
    width: 100%;
    height: 100%;
    display: block;
}

#tab2_content,.course_tab_content,#tab3_content{
    font-size: 18px;
    font-family: 'STKaiti';
    font-weight: bolder;
    background-color: #e5e5ff;
    margin: auto;
}

.tab2_div,.course_tab_div{
    padding: 20px 0;
    display: grid;
}

.tab3_div{
    padding: 10px 0;
    display: grid;
}

#tab2_content .body-img{
    align-self: center;
    justify-self: center;
}

.bottom{
    margin: auto;
    padding: 10px 0;
    width: 100vw;
    height: 65px;
    background-color: #000;
    text-align: center;
    font-size: 16px;
    line-height: 30px;
    color: #ffff;
    display: grid;
    align-content: center;
    justify-content: center;
}

.bottom a, .bottom span {
    font-family: Arial, Helvetica, sans-serif;
    align-items: center;
    color: white;
}

.margin-top-sm{
    margin-top: 20px;
}