/*共通*/
body{
    overflow-x: hidden; /* 横スクロールの禁止 */
    background-size: 100vw 100vh;
    width:100%;max-width:100%;
    text-align:center; /*ページ全体を中央揃えにする*/
    background-color: rgb(58 200 213 / 30%);
    position: relative;
    margin: 0;
    font-family: 'Hiragino Mincho ProN','ヒラギノ明朝 ProN','Hiragino Mincho Pro','ヒラギノ明朝 Pro',serif;
    font-size: 25px;
}
.item-none{
    display: none;
}
.top_box{
    background-image: url(sea_pic/beach_trash.webp);
    background-size: cover;
    background-position: center top;
    background-attachment: fixed;
    width: 100%;
    height: 100vh;
    display: flex;
    justify-content: space-between;
    align-items: center;
    overflow-y: hidden;
    text-align: left;
}
.flex_box{
    width: 99%;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: left;
}
.box{
    text-align: left;
    flex: 1;
}
.foot_list ul{
    list-style: none;
    padding: 0;
}
.one{
    margin-left: 1rem;
}
.two{
    margin-left: 2rem;
}
.content_box{
    width: 60%;
    margin: 20px auto;
    text-align: left;
}
.pic_main{
    width: 30%;
}
.pic_main_margin{
    width: 35%;
    margin: 20px 30px;
}
.pic_step{
    width: 60%;
    margin: 20px 0;
}
.pic_effect_animal{
    width: 40%;
}
.big_title{
    width: 75%;
    margin: 5px auto 30px auto;
    font-size: 35px;
}
.main_dis{
    width: 100%;
    height: 100vh;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: rgb(58 200 213 / 30%);
    overflow-y: hidden;
    text-align: left;
}
.title{
    width: 100%;
    font-weight: bold;
    font-size: 24px;
    padding: 1rem 15px;
    border-left: 30px solid rgb(0, 191, 255);
    background-color: rgb(111, 229, 255);
}
.mini_title{
    width: auto;
    font-size: 22px;
    font-weight: bold;
    margin: 20px 0px;
    border-bottom: dashed 2px black;
}
.text{
    width: 60%;
    margin: 30px 5px;
}
.text_margin{
    width: 50%;
    margin: 20px auto;
}
.country{
    padding: 5px 10px;
    background-color: rgba(255, 255, 6,0.5);
}
.back_effect{
    width: 100%;
    height: 100vh;
    background-image: url(sea_pic/sea_effect.webp);
    background-size: cover;
    background-position: center top;
    background-attachment: fixed;
    position: relative;
    z-index: 4;
}
.back_plastic{
    width: 100%;
    height: 100vh;
    background-image: url(sea_pic/plastic_2.webp);
    background-size: cover;
    background-position: center top;
    background-attachment: fixed;
    position: relative;
    z-index: 4;
}
.back_convenience{
    width: 100%;
    height: 100vh;
    background-image: url(sea_pic/convinient.webp);
    background-size: cover;
    background-position: center top;
    background-attachment: fixed;
    position: relative;
    z-index: 4;
}
.back_plastic_2{
    width: 100%;
    height: 100vh;
    background-image: url(sea_pic/plastic.webp);
    background-size: cover;
    background-position: center top;
    background-attachment: fixed;
    position: relative;
    z-index: 4;
}
.back_img{
    width: 100%;
    height: 100vh;
    background-image: url(sea_pic/micro_plastic.webp);
    background-size: cover;
    background-position: center top;
    background-attachment: fixed;
    position: relative;
    z-index: 4;
}
.back_text{
    width: 90%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    font-size: 77px;
    color: rgb(0 0 0 / 80%);
    background-color: rgba(255,255,255,0.9);
    z-index: 10;
    clip-path: polygon(95% 0,100% 50%, 95% 100%, 5% 100%, 0 50%, 5% 0);
}

.references{
    width: auto;
    cursor: pointer;
    color: blue;
    border-bottom: 1px blue solid;
}
  .references:hover{
    color: purple;
    border-bottom: 1px purple solid;
}
.mark{
    background: linear-gradient(transparent 40%, #00bbffb7 80%);
}


@media screen and (max-width: 1300px){
    /*パソコン（小）*/
    body{
        font-size: 20px;
    }
    .back_text{
        font-size: 55px;
    }
    .big_title{
        width: 60%;
        font-size: 22px;
    }
}
@media screen and (max-width: 600px){
    /*スマホ*/
    body{
        font-size: 15px;
    }
    .sumaho{
        font-size: 18px;
        position: absolute;
        top:50%;
        left:50%;
        transform:translate(-50%,-50%);
    }
}