.menu-btn{
    display: none;
}
@media screen and (max-width:1100px){
    .header__title{
        height: 60px;
        padding: 0;
        width: 100%;
        position: absolute;
        background: #fff;
        z-index: 300;
        border-bottom: solid 2px var(--sub-yellow);
    }
    .header__title__left{
        display: initial;
        width: 80%;
    }
    .header__title__left h1 img{
      margin: 0;
    }
    #header__nav div{
        width: 100%;
        height: auto;
        font-size: 18px;
    }
    #header__nav ul{
        display: initial;
    }
    #header__nav ul li{
        margin: 0;
        padding: 20px;
        border-bottom: solid 1px var(--sub-yellow);
    }

    .header__title__right{
        display: none;
    }
    .menu-btn {
        display: block;
        height: 50px;
        width: 60px;
        right: 0px;
        position: absolute;
        height: 60px;
    }
    .header .menu-btn-line {
        display: block;
        position: absolute;
        right: 11px;
        width: 40px;
        height: 3px;
        background-color: var(--main-green);
        -webkit-transition: 1s;
        transition: 0.5s;
        border-radius: 4px;
      }
      
      .header .menu-btn #line1 {
        top: 11px;
      }
      
      .header .menu-btn #line2 {
        top: 26px;
      }
      
      .header .menu-btn #line3 {
        top: 41px;
      }
      #header__nav{
        position: absolute;
        width: 100%;
        top: -100vh;
        transition: 0.5s;
        z-index: 100;
      }
      /* JS追加class */
      .menu-btn .line_1{ 
        -webkit-transform: translateY(20px) rotate(-45deg);
        transform: translateY(20px) rotate(-45deg);
      }
      .menu-btn .line_2{
        width: 0;
      }
      .menu-btn .line_3{
        -webkit-transform: translateY(-9px) rotate(45deg);
        transform: translateY(-9px) rotate(45deg);
      }
       #header__nav.header__nav-in{
           top: 60px;
       }
}