main {
    width: 100%;
    display: flex;
    flex-flow: column;
    justify-content: center;
    align-items: center;
}

.title-outer {
    width: 100%;
    height: 900px;
    background-image: url('/img/index/background.jpg');
    background-position: center;
    position: relative;
}

.title-text {
    font-size: 44px;
    position: absolute;
    top: 170px;
    left: 280px;
    font-weight: 600;
    color: white;
}
.title-sub-text {
    margin-top: 40px
}

.title-english {
    width: 800px;
    position: absolute;
    top: 370px;
    left: 280px;
    color: white;
    line-height: 50px;
}

.op-button {
    position: absolute;
    top: 570px;
    left: 280px;
}

.op-button button {
    width: 212px;
    height: 60px;
    font-size: 28px;
    font-weight: 700;
    color: white;
    background-color: #26A1FF;
    border: none;
    cursor: pointer;
}
.group {
    font-weight: 600;
}

.more {
    color: #B0B0B0;
}

.project-group {
    width: 1200px;
    padding-top: 60px;
    padding-bottom: 80px;
}
.project-group-more {
    display: flex;
    flex-flow: row;
    width: 100%;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

.project-group-info {
    display: flex;
    width: 1200px;
    height: 220px;
    flex-flow: row;
    justify-content: space-between;
}

.project-group-outer {
    display: flex;
    width: 388px;
    height: 220px;
    box-shadow: 0px 0px 30px -21px;
    background: linear-gradient(to bottom, #FFFFFF, #F7FAFF);
    flex-flow: row;
    align-items: center;
    justify-content: space-around;
}

.project-text {
    width: 210px;
    height: 146px;
}

.project-group-outer img {
    width: 86px;
    height: 120px;
}

.name {
    font-weight: 600;
}

.info {
    line-height: 30px;
}

.video-watch {
    width: 1200px;
    display: flex;
    flex-flow: column;
    padding-top: 60px;
    
}

.video-title {
    display: flex;
    flex-flow: row;
    justify-content: space-between;
    padding-bottom: 40px;
}

.video-item-outer {
    display: flex;
    flex-flow: row;
    align-items: center;
    width: 282px;
    height: 320px;
    border-radius: 20px;
}

.video-item {
    display: flex;
    flex-flow: column;
    align-items: center;
    width: 282px;
    height: 320px;
    box-shadow: 0px 0px 5px -2px;
    border-radius: 20px;
    margin-right: 20px;
}

.video-info {
    padding: 10px;
}

.video-text {
    margin-top: 10px;
    font-size: 14px;
}

.video-item-img {
    width: 282px;
    height: 197px;
    background-image: url(/img/index/jianjie.jpg);
    border-top-left-radius: 20px;
    border-top-right-radius: 20px;
}

.video-item-img1 {
    width: 282px;
    height: 197px;
    background-image: url(/img/index/yindao.jpg);
    border-top-left-radius: 20px;
    border-top-right-radius: 20px;
}

.video-click-button {
    width: 88px;
    height: 26px;
    background-color: #4571C9;
    display: flex;
    flex-flow: row;
    justify-content: center;
    align-items: center;
    font-size: 14px;
    border-radius: 4px;
    color: white;
    cursor: pointer;
}

.video-click-button-outer{
    width: 100%;
    display: flex;
    flex-flow: row;
    justify-content: flex-end;
}

.video-player {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #1a1a1a3d;
    display: flex;
    flex-flow: row;
    justify-content: center;
    align-items: center;
}

.close {
    position: absolute;
    top: 20px;
    right: 20px;
    cursor: pointer;
}

video {
    border-radius: 20px;
}