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

    .aiback {
        width: 100%;
    }

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

    .aicultivate-title {
        width: 1200px;
        margin: auto;
    }

        .aicultivate-title label {
            display: block;
            font-size: 50px;
            color: #00265E;
            line-height: 60px;
            text-align: center;
            margin-top: 65px;
        }

    .aicultivate-content {
        width: 1200px;
        margin: auto;
        margin-top: 50px;
    }

        .aicultivate-content li {
            margin-bottom: 55px;
        }

            .aicultivate-content li label {
                display: block;
                font-family: PingFang SC, PingFang SC;
                font-weight: bold;
                font-size: 24px;
                color: #00265D;
                line-height: 36px;
            }

            .aicultivate-content li p {
                display: block;
                font-family: PingFang SC, PingFang SC;
                font-size: 20px;
                color: #00265D;
                line-height: 36px;
            }

    .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-between;
        flex-wrap: wrap;
        width: 1200px;
        margin: 0 auto;
        margin-top: 90px;
    }

        .aicourse-imgs li {
            position: relative;
            width: calc(30% - 20px);
            padding: 10px;
            background: #FFFFFF;
            box-shadow: 0px 0px 14px 0px rgba(55,140,231,0.2);
            border-radius: 10px;
            margin-bottom: 30px;
        }

            .aicourse-imgs li label {
                display: flex;
                align-items: center;
                justify-content: center;
                background: linear-gradient(148deg, #0F62FB, #69B0FD);
                border-radius: 6px;
                text-align: center;
                margin-top: 25px;
                font-weight: bold;
                font-size: 24px;
                color: #FFFFFF;
                height: 150px;
                line-height: 34px;
            }

    .aicourse-item {
        height: 90px;
        display: block;
        margin: auto;
        margin-top: 40px;
    }


    .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: 40%;
            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, #7AD3FD);
        border-radius: 9px;
        border: none;
        padding: 10px 0;
    }

    .channel-content {
        width: 1200px;
        margin: 0 auto;
        margin-top: 35px;
        font-family: PingFang SC, PingFang SC;
    }

    .left-title label {
        text-align: left;
    }

    .courseclist {
        width: 1200px;
        margin: auto;
    }

    .coursec-title {
        background: linear-gradient( 90deg, #0871D3, #1F8EDD);
        border-radius: 8px;
        display: inline-flex;
        align-items: center;
        padding: 21px 74px 21px 35px;
        margin-top:50px;
    }
    .coursec-title  label{
        font-weight: bold;
        font-size: 26px;
        color: #FFFFFF;
        line-height: 30px;
    }
        .coursec-title p {
            display:flex;
            align-items:baseline;
            font-weight: bold;
            font-size: 40px;
            color: #FFFF00;
            line-height: 30px;
            margin-left:20px;
        }

            .coursec-title p span {
                font-size: 26px;
                font-weight: 500;
            }

    .coursec-about {
        display: block;
        width: 100%;
        border: none;
        background: none;
        font-family: PingFang SC, PingFang SC;
        font-weight: 400;
        font-size: 20px;
        color: #00265D;
        line-height: 36px;
        margin-top: 20px;
    }

    .coursec-content{
        margin-top:50px;
    }
}