.main-section .bg-wrap video{
    position: fixed;
    width: 100%;
    height: 100%;
    z-index: -1;
    object-fit: cover;
    opacity: 0;
    transition: opacity 1s;
}
.main-section.active .bg-wrap video{opacity: 1;}

.main-section .textbox{
    position: absolute;
    top: 50%;
    left: 50%;
    width: 90%;
    text-align: center;
    transform: translate(-50%, -50%);
    color: #fff;
}

.main-section .textbox .tit{
    font-size: 60px;
    line-height: 1.3;
    letter-spacing: -0.06em;
}
.main-section .textbox .sub{
    font-size: 22px;
    line-height: 1.6;
    letter-spacing: -0.05em;
    margin-top: 50px;
    text-align: center;
}


.box{
    width: 900px;
    height: 500px;
    border-radius: 35%;
    transition: border-radius 1s;
}
.box.act{
    border-radius: 0%;
}


@media screen and (max-width:1024px){
    .main-section .textbox .tit{
        font-size: 60px;
    }
    .main-section .textbox .sub{
        font-size: 22px;
    }
}
@media screen and (max-width:850px){
    .main-section .textbox .tit{
        font-size: 50px;
    }
    .main-section .textbox .sub{
        font-size: 20px;
        margin-top: 40px;
    }
}
@media screen and (max-width:600px){
    .main-section .textbox{
        width: 80%;
        text-align: left;
    }
    .main-section .textbox .tit{
        display: block;
        font-size: 40px;
    }
    .main-section .textbox .sub{
        text-align: left;
        font-size: 18px;
        margin-top: 30px;
    }
}
@media screen and (max-width:450px){
    .main-section .textbox .tit{
        font-size: 35px;
    }
    .main-section .textbox .sub{
        font-size: 17px;
        margin-top: 20px;
    }
}