@media screen and (max-width: 730px){
    header{
        height: 85px;
    }
    div.main_visual>img{
        width: 100%;
        height: 760px;
    }
    #ham-menu{
        opacity: 0;
        position: fixed;
    }
    label .buns{
        position: fixed;
        top: 1.2em;
        right: 1em;
        z-index:3;
        height: 2em;
        width: 2em;
    }
    label .buns::before,
    label .buns::after,
    label .buns .patty {
        position: absolute;
        left: 0;
        width: 100%;
        height: 4px;
        border-radius: 5px;
        background: #fff;
        content: "";
        transition:all .3s;
    }
    label .buns::before{
        top: 0;
        transform-origin: top left;
    }
    label .buns .patty{
        top: 45%;
    }
    label .buns::after{
        bottom: 0;
        transform-origin: bottom left;
    }
    header nav ul{
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        z-index: 2;
        height: 100%;
        display: flex;
        flex-flow: column nowrap;
    }
    .bd-no{
        display: none;
    }
    header nav ul::before{
        position: absolute;
        top: 0;
        bottom: 0;
        left: 0;
        z-index: -1;
        width: 27em;
        background: rgba(42, 124, 83,.9);
        transform: skewX(-20deg) translateX(-200%);
        transform-origin: bottom left;
        transition:  transform.3s;
        content: "";
    }
    header nav ul li{
        margin: 1em 1em ;
        padding: 0.2em 1em;
        transform: translateX(-150%);
        transition: all .3s, transfrom .5s;
        transition-timing-function: cubic-bezier(0.19, 1, 0.22, 1);
    }
    header nav ul li:nth-of-type(1){
        margin-top: 5em;
    }
    /* header nav ul li:nth-of-type(1)::before{
        content: "";
        background-image: url(img/mashiro.png);
    } */
    /* header nav ul li a{color: #000;} */
    #ham-menu:checked + label .buns::before,
    #ham-menu:checked + label .buns::after{
        width: 130%;
    }
    #ham-menu:checked + label .buns .patty{
        transform: scale(0);
    }
    #ham-menu:checked + label .buns::before {
        transform: rotate(45deg);
    }
    #ham-menu:checked + label .buns::after {
        transform: rotate(-45deg);
    }
    #ham-menu:checked ~ nav ul::before {
        transform: skewX(-20deg) translateX(-50%);
    }
    #ham-menu:checked ~ nav ul li{
        transform: translateX(0);
    }
    #ham-menu:checked ~ .light-dark{
        background: #000;
        opacity: .5;
        position: fixed;
        left: 0;
        top: 0;
        height: 100%;
        width: 100%;
    }


    /* main_visual start */
    div.title{
        width: 85%;
        height: 200px;
        bottom: 5%;
    }
    div.title p{
        font-size: 15px;
    }
    div.title span.t_text1{
        font-size:48px
    }
    div.title span.t_text2{
        font-size: 30px;
    }
    /* main_visual end */


  /* button start */
    div.content{
        position: relative;
        height: 900px;
        width: 100%;
        background:#000000d9 ;
        padding-top: 10em;
        flex-direction: column;
        color: #fff;
    }
    button.start_btn_circle{
        position: fixed;
        right: 15px;
        bottom: 15px;
        width: 100px;
        height: 100px;
        border-radius: 50%;
        text-align: center;
        font-size: 10px;
        background: linear-gradient(-45deg, rgba(246, 255, 0, .95), rgba(255, 0, 161, .95));
        z-index: 100;
        transition: .2s;
    }
    button.start_btn_circle:hover{
        width: 90px;
        height: 90px;
    }
    div.start_guide{
        width: 80%;
        height: 280px;
        font-size:19px;
        line-height: 30px;
    }
    div.btn{
        width:100%;
        height: 450px;
        display: flex;
        justify-content: center;
    }
    button.start_btn{
        position: absolute;
        top:0;
        background: #fff;
        width: 80%;
        height: 150px;
        border-radius: 15px;
        display: flex;
        flex-direction: row;
        justify-content: space-around;
        align-items: center;
        font-size: 20px;
        color: #000;
        box-shadow: 0px 8px 15px rgba(0, 0, 0, 0.3);
        border-bottom:solid 5px #111;
        transition: .3s;
    }
    button.start_btn img{
        width: 65px;
        height: 70px;
    }

    button.stamp_btn,
    button.map_btn{
        position: absolute;
        bottom: 0;
        width: 47%;
        height: 150px;
        border-radius: 15px;
        font-size: 20px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    button.stamp_btn{
        left: 10px;
    }

    button.map_btn{
        right: 10px;
    }
    /* button end */


    /* content2 start */
    section.content2{
        width: 100%;
        height: 700px;
        padding-top: 100px;
        display: flex;
        flex-direction: column-reverse;
        align-items: center;
        justify-content: space-evenly;
        color: #fff;
        /* background: aqua; */
    }
    section.content2 img{
        width: 280px;
        height: 360px;
    }
    /* content2 end */

    /* content3 start */
    section.content3{
        width: 100%;
        height: 500px;
        padding-top: 100px;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: space-evenly;
        color: #fff;
    }
    section.content3 img{
        width: 300px;
        height: 300px;
    }
    /* content end */

}