main{
    width: 100%;
    /* height: 10000px; */
    user-select: none;
    /* background-color: rgb(206, 206, 206); */
}
main > section{
    width: 100%;
    height: 500px;
    margin-bottom: 80px;
    background-color: bisque;
}
main > ul{
    width: 1200px;
    /* height: 2650px; */
    margin: auto;
    /* background-color: rgb(255, 237, 215); */
}
main > ul > li{
    width: 1200px;
    /* height: 3290px; */
    margin-top: 50px;
    /* background-color: cadetblue; */
}
/* main > ul > li > ul{
    display: flex;/*弹性盒模型*
    justify-content: space-between;/* 主轴两侧对齐 *
} */
/* main > ul > li > ul > li > section{
    width: 1145px;
    /* height: 300px; *
    /* background-color: chocolate; *
} */
main > ul > li > ul > li > section{
    position: relative;/*相对定位*/
    border-top: 3px solid rgb(112, 112, 112);/*实心边框*/
}
main > ul > li > ul > li > section > section:nth-child(1){
    position: absolute;/* 绝对定位 */
    top: -30px;
    left: 0;
    right: 0;
    width: 50px;
    height: 50px;
    border: 3px solid rgb(112, 112, 112);/*实心边框*/
    margin: auto;
    background-color: chocolate;
    font-size:26px;/*字体大小*/
    color: rgb(0, 247, 255);
    font-weight:bold;/*字体粗细*/
    line-height:50px;/*文字垂直居中*/
    text-align: center; /*文字水平居中*/
    border-radius: 50px;/*圆角大小*/
}
main > ul > li > ul > li > section > i.iconfont{
    position: absolute;/* 绝对定位 */
    top: -14px;
    font-size:23px;/*字体大小*/
    color: rgb(112, 112, 112);
}
.line-right{
    border-right: 3px solid rgb(112, 112, 112);/*实心边框*/
}
.line-left{
    border-left: 3px solid rgb(112, 112, 112);/*实心边框*/
}
main > ul > li:nth-child(1) > ul > li:first-of-type > section > i{
    left: -13px;
    top: 487px;
}
main > ul > li:nth-child(2) > ul > li:first-of-type> section > i{
    left: 1187px;
    top: 673px;
}
main > ul > li:nth-child(3) > ul > li:first-of-type > section > i{
    left: -13px;
    top: 392px;
}
main > ul > li:nth-child(4) > ul > li:first-of-type > section > i{
    left: 1187px;
    top: 3739px;
}
main > ul > li:nth-child(5) > ul > li:first-of-type > section > i{
    left: -13px;
    top: 219px;
}
main > ul > li:nth-child(6) > ul > li:first-of-type > section > i{
    left: 1187px;
    top: 671px;
}
main > ul > li:nth-child(7) > ul > li:first-of-type > section > i{
    left: -13px;
    top: 826px;
}
main > ul > li:nth-child(8) > ul > li:first-of-type > section > i{
    left: 1187px;
    top: 2226px;
}
main > ul > li:nth-child(9) > ul > li:first-of-type > section > i{
    left: -13px;
    top: 825px;
}
main > ul > li:nth-child(10) > ul > li:first-of-type > section > i{
    left: 1187px;
    top: 314px;
}
main > ul > li:nth-child(11) > ul > li:first-of-type > section > i{
    left: -13px;
    top: 527px;
}
.Knowledge-introduction:hover > section > section:nth-child(1) > p{
    background-color: rgb(255, 238, 0);
    color: rgb(212, 0, 255);
    border-radius: 50px;/*圆角大小*/
}
.Knowledge-introduction > section > p:first-of-type{
    margin: 33px 0 15px 0;
    font-size:26px;/*字体大小*/
    color: rgb(153, 0, 255);
    font-weight:bold;/*字体粗细*/
    text-align: center; /*文字水平居中*/
}
.Knowledge-introduction > section > section:nth-of-type(2){
    width: 1000px;
    /* height: 171px; */
    margin-left: 154px;
    padding: 15px;
    border: 8px solid rgb(31, 31, 31);/*实心边框*/
    background-color: rgb(0, 141, 24);
}
.Knowledge-introduction > section > section:nth-of-type(2) > p:nth-of-type(1){
    margin-top: 0px;
}
.Knowledge-introduction > section > section:nth-of-type(2) > p{
    margin-top: 10px;
    font-size:14.5px;/*字体大小*/
    color: rgb(244, 228, 255);
}
.content{
    text-indent: 30px; /* 文本缩进 */ 
}
main > ul > li:nth-child(2) > ul > li:first-of-type > section > section:nth-child(3){
    margin-left: 0px;
}
main > ul > li:nth-child(4) > ul > li:first-of-type > section > section:nth-child(3){
    margin-left: 0px;
}
main > ul > li:nth-child(6) > ul > li:first-of-type > section > section:nth-child(3){
    margin-left: 0px;
}
main > ul > li:nth-child(8) > ul > li:first-of-type > section > section:nth-child(3){
    margin-left: 0px;
}
main > ul > li:nth-child(10) > ul > li:first-of-type > section > section:nth-child(3){
    margin-left: 0px;
}
main > ul > li > ul > li:nth-child(2){
    width: 1200px;
    height: 400px;
    background-color: rgb(255, 255, 255);
}
.image-content{
    position: relative;/*相对定位*/
    top: 3px;
    margin-top: 40px;
}
.image-content:hover{
    position: relative;/*相对定位*/
    top: 0;
    box-shadow: 0px 20px 20px 0px rgb(155, 155, 155);/*阴影*/
}