.pc{
    display: none;
}
.sp{
    display: block;
}
header{
    padding: 10px 18px;
}
header nav{
    max-height: 0;
    overflow: hidden;
    transition: 0.2s ease;
}
header .sp-btn.active+nav{
    max-height: 100vh;
}
header .sp-btn{
    text-align: right;
}
header .sp-btn img{
    margin-left: auto;
    cursor: pointer;
}
header ul{
    flex-flow: column;
    text-align: center;
    padding: 60px 0;
    gap: 24px 64px;
}
main{
    padding-top: 50px;
}

#mv img {
    min-height: 278px;
}
#detail dl{
    width: 288px;
    display: block;
    margin: auto;
}
#detail dt{
    margin-bottom: 16px;
    font-size: 16px;
    border-width: 2px;
}
#detail dd{
    font-size: 14px;
    margin-bottom: 24px;
}
#detail dd:nth-last-child(1){
    margin-bottom: 0;
}
#detail dd p{
    margin-bottom: 14px;
}

.sec-frame{
    border-left: none;
    border-right: none;
    border-radius: 0;
    padding: 70px 20px 40px 20px;
}
.sec-tl{
    font-size: 24px;
    margin-top: -106px;
}
#content dl{
    grid-template-columns: 1fr;
    text-align: center;
}
#content dt{
    width: 145px;
    margin: auto;
}
#content dd:nth-last-child(1){
    text-align: left;
    display: inline-block;
    margin: auto;
}

#play.sec-frame{
    padding: 70px 20px 40px 20px;
}
.play__list{
    grid-template-columns: 1fr;
    gap: 84px 0;
    width: 320px;
    max-width: 100%;
    margin: auto;
}
.play__item:after{
    top: auto;
    bottom: -80px;
    left: 0;
    right: 0;
    margin: auto;
    rotate: 90deg;
}

#notes.sec-frame{
    padding: 70px 20px 40px 20px;
}
.presents__grid{
    display: flex;
    flex-flow: column;
    justify-content: center;
    align-items: center;
}
.present__item{
    max-width: 345px;
}