@media screen and (max-width: 360px) {
}
@media screen and (max-width: 480px) {
}
@media screen and (max-width: 540px) {
}
@media screen and (max-width: 640px) {
}
@media screen and (max-width: 750px) {
    .ai_devp-img {
        height: 11rem;
        border-bottom: 1px solid #3f3f3f;
    }

    .ai_devp-txt {
        font-size: 2rem;
        padding-left: 2rem;
        line-height: 11rem;
    }

    .ai_devp-wrapper {
        -webkit-box-orient: vertical;
        -webkit-box-direction: normal;
            -ms-flex-direction: column;
                flex-direction: column;
        padding: 0rem 0 3rem;
    }

    .ai_nav-box {
        width: 100%;
    }

    .ai_devp-conent {
        margin-left: 0;
        margin-top: 3rem;
    }

    .ai_devp-list {
        padding: 0 1.7rem;
    }
    .ai_devp-list {
        margin-top: 2.5rem;
    }
    .ai_devp-title {
        font-size: 1.1rem;
    }

    .ai_devp-item {
        font-size: 0.54rem;
    }

    .ai_devp-down {
        width: 2.6rem;
    }

    .devp-down {
        width: 0.77rem;
        height: 0.77rem;
    }

    .ai_nav-item.active {
        border-left: none;
    }

    .ai_nav-title {
        position: relative;
        /* height: 2rem; */
        line-height: 3;
        border-bottom: 1px solid #3f3f3f;
        /* border-top: 1px solid #3F3F3F; */
        padding-top: 0;
        padding-left: 2rem;
        font-size: 1rem;
    }

    .ai_nav-item {
        margin-top: 0;
        border-bottom: 1px solid #3f3f3f;
        /* height: 2rem; */
        line-height: 3;
        padding-top: 0;
        padding-left: 2rem;
        font-size: 1rem;
    }

    .ai_nav-list {
        padding-bottom: 0;
    }

    .ai_nav-title-narrow {
        display: inline-block;
        position: absolute;
        right: 2rem;
        top: 50%;
        background: url(../imgs/product_devp_open.png) no-repeat;
        background-size: 100% 100%;
        width: 0.7rem;
        height: 0.7rem;
        -webkit-transform: translateY(-50%);
                transform: translateY(-50%);
    }

    .ai_nav-title-narrow.active {
        background: url(../imgs/product_devp_close.png) no-repeat;
        background-size: 88% 88%;
    }

    .moblie_none {
        display: none;
    }
    .ai_devp-version {
        margin-right: 0.6rem;
    }
    .ai_devp-time {
        margin-right: 0.6rem;
    }
}