.knowledge-bj{
    /* background-image: url(../img/bj.png); */
    /* background-size: 100% 100%; */
    background: #F8FCFC;
    /* position: relative; */
}
.knowledge-tab{
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 40px 0 10px 0;
    position: relative;
    top: -73px;
    /* left: 525px; */
}
.knowledge-tab-item{
    position: relative;
    padding: 5px 18px;
    background: transparent;
    border-radius: 20px; 
    cursor: pointer;
    /* color: #fff; */
}
.active{
    background: #448B5B;
    color: #fff;
}

.knowledge-gird{
    width: 1200px;
    /*margin: 15px auto;*/
    display: grid;
    grid-template-columns: repeat(4, 280px);
    grid-row-gap: 30px;
    grid-column-gap: 14px;
    margin: 20px auto 0 auto;
}
.knowledge-item{
    position: relative;
    height: 300px;
    padding: 40px 20px;
    border-radius: 10px;
    background-color: #fff;
    box-sizing: border-box;
}
.knowledge-item-title{
    height: 48px;
    padding-bottom: 30px;
}
.arrow-active{
    display: block;
    width: 24px;
    height: 24px;
    opacity: 0;
}
.knowledge-item:hover .knowledge-item-img{
    height: 200px;
    top: -90px;
    /*background-image: url(https://f7.baidu.com/it/u=1348407579,3077100053&fm=222&app=106&size=f360,240&n=0&f=JPEG?sec=1670518800&t=16a534cbd748071ad50123d737a6a9f5);*/
   
    box-shadow: 0 0px 5px 0px rgba(0,0,0,.3);
}
.knowledge-item:hover .knowledge-item-img-text{
    color: #fff;
    background: rgba(0,0,0,.4);
    width: 100%;
}
/* .knowledge-item:hover .arrow-active{
    opacity: 1;
    transition: opacity 1s;
} */
/* .knowledge-item:hover .arrow-right{
    display: none;
} */
.knowledge-item-img{
    overflow: hidden;
    display: flex;
    align-items:flex-end;
    position: absolute;
    border-radius: 10px 10px 0 0;
    /* top: -90px; */
    top: 0;
    left: 0;
    right: 0;
    height: 110px;
     transition: all .3s;
}
.knowledge-item-img img {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
}
.knowledge-item-img-text{
    position: absolute;
    bottom: 0;
    left: 0;
    padding: 10px 20px;
    font-size: 18px;
    font-weight: 600;
    color: #FFFFFF; 
    width: 100%;
    background: rgba(0,0,0,.3);
    box-sizing: border-box;
}
.avatar{
    width: 16px;
    height: 16px;
    border-radius: 50%;
}