@media (min-width: 767px) {
    .aibox {
        position: relative;
    }

    .aiback{
        width:100%;
    }

    .aicontent{
        position:absolute;
        top:0;
        left:0;
        width:100%;
        height:100%;
    }

    .aicultivate-title {
        width: 1100px;
        margin: 0 auto;
        margin-top: 110px;
        display: flex;
        justify-content: flex-end;
    }

        .aicultivate-title label {
            font-family: PingFang SC, PingFang SC;
            font-size: 50px;
            color: #00265E;
            line-height: 60px;
            margin:0 30px;
            text-align:right;
        }

    .aicultivate-content {
        width: 850px;
        margin: 0 auto;
        display: flex;
        flex-direction: column;
        margin-top: 50px;
        transform: translateX(16.5%);
    }

        .aicultivate-content li {
            width: calc(100% - 10px);
            border-left: 10px solid #1767DD;
            margin-bottom: 30px;
            background:white;
        }

            .aicultivate-content li p {
                display: block;
                font-family: PingFang SC, PingFang SC;
                font-size: 20px;
                color: #00265D;
                line-height: 36px;
                padding:33px 0;
                padding-left:38px;
                padding-right:26px;
            }

            .ai-title {
                margin-top: 110px;
            }

            .ai-title label {
                display:block;
                font-family: PingFang SC, PingFang SC;
                font-size: 50px;
                color: #00265E;
                line-height: 60px;
                text-align:center;
            }

    .aicourse-imgs {
        display: flex;
        align-items: center;
        justify-content:space-around;
        width: 1200px;
        margin: 0 auto;
        margin-top: 90px;
    }

    .aicourse-imgs li{
        position:relative;
        width:28%;
    }

    .aicourse-item {
        width: 100%;
    }

    .aicourse-add{
        width:38px;
        height:38px;
        position:absolute;
        right:-10px;
        bottom:10%;
    }

    .aicourse-imgs li:last-child .aicourse-add{
        display:none;
    }

    .aicourse-txt {
        display: flex;
        align-items: center;
        justify-content: space-around;
        width: 1200px;
        margin: 0 auto;
        margin-top: 80px;
    }

        .aicourse-txt li {
            width: 28%;
            min-height: 130px;
            background: white;
            border: 1px solid #5BB0FF;
            border-radius: 5px;
            padding: 17px 10px;
            display:flex;
            align-items:center;
        }

            .aicourse-txt li p {
                font-family: PingFang SC, PingFang SC;
                font-size: 16px;
                color: #00265D;
                line-height: 26px;
                display: block;
            }
    .join{
        padding-bottom:20%;
    }
    .joinbox {
        position: absolute;
        top: 50%;
        left: 21%;
        width: 58%;
        background: rgba(255,255,255,0.9);
        border-radius: 15px;
        border: 1px solid #5BB0FF;
        padding:61px 0;
    }

        .joinbox label {
            display:block;
            font-family: PingFang SC, PingFang SC;
            font-size: 30px;
            color: #00265E;
            line-height: 30px;
            text-align: center;
            margin-bottom:70px;
        }

    .joinitem {
        display: flex;
        margin: auto;
        align-items: center;
        justify-content: center;
        margin-bottom: 51px;
    }

        .joinitem p {
            display:block;
            width:15%;
            font-family: PingFang SC, PingFang SC;
            font-size: 30px;
            color: #333333;
            line-height: 30px;
            text-align:right;
        }

        .joinitem input {
            width:30%;
            font-family: PingFang SC, PingFang SC;
            font-size: 30px;
            color: #333333;
            line-height: 30px;
            background: #FFFFFF;
            border-radius: 6px;
            border: 1px solid #5BB0FF;
            padding:0 10px;
        }

    .joinbox button {
        width:30%;
        display: block;
        line-height: 32px;
        margin: 0 auto;
        font-family: PingFang SC, PingFang SC;
        font-size: 28px;
        color: #FFFFFF;
        background: linear-gradient( 90deg, #2071E0 0%, #7AD3FD 100%);
        border-radius: 9px;
        border: none;
        padding:10px 0;
    }
}