@media screen and (max-width:1024px) {
    /* ov_content */
    .ov_tit{
        font-size: 1.1rem;
    }
    .ov_detail{
        font-size: 1rem;
    }
    .ov_detail span{
        font-size: 0.95rem;
    }
    .main_btn{
        width: 50%;
    }
    .main_btn button{
       width: 120px;
       height: 60px;
    }
    .main_btn button p{
        font-size: 1rem;
    }
    .greetings_text p{
        font-size: 1.1rem;
        font-weight: 500;
    }
    .sp_pic{
        width: 100px;
        height: 100px;
        margin-top: 10%;
    }
}
@media screen and (max-width:900px) {
    .main_btn{
        width: 80%;
    }
    .main_btn button{
        width: 100px;
     }
     .greetings_text p{
        font-size: 1rem;
        font-weight: 500;
    }
}
@media screen and (max-width:768px){
    .main_tit p{
        font-size: 1.2rem;
    }
    /* banner */
    #banner{
        margin-top: 80px;
        padding-top: 0;
    }
    .banner img{
        content: url(../img/banner_mo.png);
    }
    /* main_btn */
    .main_btn{
        width: 80%;
    }
    .main_btn button p{
        font-size: 0.8rem;
    }
    .main_btn button{
        width: 90px;

    }
    /* ov_content */
    .ov_content{
        display: block;
    }
    .ov_poster{
        width: 100%;
    }
    .ov_text{
        width: 100%;
        margin-left: 0;
    }
    .ov_tit{
        font-size: 1rem;
        width: 100px;
        padding-left: 0;
    }
    .ov_detail{
        font-size: 0.9rem;
    }
    .ov_detail span{
        font-size: 0.85rem;
    }
    .ov_detail a{
        font-size: 0.9rem;
    }
    .ov_text img{
        display: none;
    }
    /* speakers */
    #speakers{
        width: 90%;
    }
    .swiper-button-prev i,
    .swiper-button-next i{
        display: none;
    }
    .sp_pic{
        width: 100px;
        height: 100px;
    }
    .sp_detail .name{
        font-size: 16px;
        font-weight: 700;
    }
    .sp_detail .business{
        font-size: 14px;
    }
    .sp_detail:nth-child(-n+1){
        margin-top: 50%;
    }
    #replay .video_wrap iframe{
        width: 80%;
        height: 350px;
    }
    #live .video_wrap div{
        width: 80%;
        height: 250px;
    }
    #live .video_wrap div i{
        line-height: 250px;
    }
    .greetings_text p{
        font-size: 0.9rem;
        font-weight: 500;
    }
    .hoste_logo{
        width: 60%;
    }
    section{
        padding-top: 10%;
    }
}
@media screen and (max-width:425px) {
    /* main_btn */
    .main_btn button p{
        font-size: 0.8rem;
    }
    .main_btn button{
        width: 90px;
        height: 50px;
    }
     /* ov_content */
     .ov_tit{
        font-size: 0.8rem;
        width: 100px;
        padding-left: 0;
    }
    .ov_detail{
        font-size: 0.8rem;
    }
    .ov_detail span{
        font-size: 0.75rem;
    }
    .ov_detail a{
        font-size: 0.8rem;
    }
    .sp_pic{
        width: 80px;
        height: 80px;
    }
    .sp_wrap{
        height: 180px;
    }
    .swiper{
        height: 220px;
    }
    .sp_detail .name{
        font-size: 14px
    }
    .sp_detail .business{
        font-size: 12px;
    }
    #replay .video_wrap iframe{
        height: 200px;
    }
    .greetings_text p{
        font-size: 0.8rem;
    }
}