.common-subtitle {
    width: 800px;
    margin: auto;
}

.sec:nth-child(2n + 1) {
    background: #F9FAFF;
}

.sec1 .sec-content {
    text-align: center;
}

.sec1 .sec-content img {
    max-width: 100%;
}

.sec2 .sec-content {
    margin-top: 30px;
}

.sec2 .item {
    width: 386px;
    height: 200px;
    float: left;
    background: linear-gradient(180deg, #F4F5F8 0%, #FFFFFF 100%);
    box-shadow: 0px 4px 6px 0px #EFF3F9;
    border-radius: 12px;
    margin-right: 21px;
    position: relative;
    cursor: pointer;
    padding: 0 33px;
    box-sizing: border-box;
}

.sec2 .item:nth-child(3n) {
    margin-right: 0;
}

.sec2 .item .img-box {
    width: 164px;
    height: 90px;
    position: absolute;
    left: 50%;
    top: 0;
    transform: translate(-50%, -50%);
}

.sec2 .item .title {
    margin-top: 74px;
    font-size: 20px;
    font-weight: 600;
    color: #000;
    line-height: 28px;
    text-align: center;
}

.sec2 .item .desc {
    font-size: 16px;
    color: #666;
    margin-top: 16px;
    text-align: center;
    line-height: 22px;
    text-overflow: -o-ellipsis-lastline;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
}

.sec3 .item {
    width: 386px;
    height: 200px;
    margin-right: 21px;
    background: linear-gradient(180deg, #F4F5F8 0%, #FFFFFF 100%);
    box-shadow: 0px 4px 6px 0px #EFF3F9;
    border-radius: 12px;
    margin-top: 21px;
    float: left;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0 30px;
    cursor: pointer;
    box-sizing: border-box;
}

.sec3 .item:nth-child(-n+3) {
    margin-top: 0;
}

.sec3 .item:nth-child(3n) {
    margin-right: 0;
}

.sec3 .item .img-box {
    width: 98px;
    margin-right: 17px;
    flex-shrink: 0;
}

.sec3 .item .title {
    font-size: 20px;
    color: #000;
    line-height: 28px;
    font-weight: 600;
}

.sec3 .item .desc {
    font-size: 16px;
    color: #666;
    line-height: 22px;
    margin-top: 16px;
}

.sec4 .item {
    margin-right: 21px;
    margin-top: 21px;
    position: relative;
    float: left;
}

.sec4 .item:nth-child(-n+3) {
    margin-top: 0;
}

.sec4 .item:nth-child(3n) {
    margin-right: 0;
}

.sec4 .item .img-box {
    width: 386px;
    height: 200px;
}

.sec4 .item .title {
    font-size: 24px;
    color: #000;
    font-weight: 600;
    line-height: 33px;
    margin-top: 20px;
    text-align: center;
}