body {
    background-color: #000;
    color: #ccc;
    font-size: 13px;
    margin: 0;
    padding: 0;
    font-family: "游ゴシック Medium", "Yu Gothic Medium", "游ゴシック体", "YuGothic", "ヒラギノ角ゴ ProN W3", "Hiragino Kaku Gothic ProN", "メイリオ", "Meiryo", "verdana", sans-serif;
}

body::before {
    content: "";
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    z-index: -1;
    width: 100%;
    height: 100vh;
    background-repeat: no-repeat;
    background-image: url(img/jakub-dziubak-gj7BLlSzIFs-unsplash.jpg);
    background-size: cover;
}

img {
    display: bock;
    width: 100%;
}

section {
    width: 275px;
    margin: 1rem auto 6rem auto;
}

p {
    font-size: 13px;
    font-weight: 400;
    height: auto;
    letter-spacing: 0.06em;
    line-height: 2;
}

ul {
    list-style: none;
    padding-left: 0;
}

a {
    text-decoration: none;
    color: inherit;
}

a:visited {
    color: inherit;
}

.btn {
    display: block;
    width: 100px;
    line-height: 1.8;
    margin: 2rem auto;
    background: #aaaaaa60;
    text-align: center;
}

#menu-footer {
    position: fixed;
    bottom: 0;
    background: #000;
    width: 100%;
    font-size: 18px;
    z-index: 99;
}

#menu-footer ul {
    display: flex;
    width: 100%;
}

#menu-footer ul li {
    width: 33%;
    text-align: center;
}

#menu-footer ul li a {
    color: #999;
}

#menu-side {
    display: none;
}

#page_top {
    height: 100vh;
    width: 100%;
    text-align: center;
}

#page_top p {
    margin: 100px auto 0 auto;
}

#page_top img {
    margin: 0 auto 100px auto;
    width: 275px;
}

#news ul {
    border-top: solid 1px #666;
}

#news ul li {
    line-height: 3;
    border-bottom: solid 1px #666;
}

#news ul li a {
    color: #aaa;
    text-decoration: none;
}

#news ul li span {
    margin-right: 15px;
    font-size: 12px;
    color: inherit;
}

.news-single h1 {
    font-weight: 500;
    margin: 60px auto;
}

.news-single p {
    line-height: 1.5;
    margin-bottom: 2rem;
}

footer {
    text-align: center;
    font-size: 12px;
    padding-top: 100px;
    padding-bottom: 80px;
    color: #999;
}


/* トップへ戻るボタン */

.page_top_btn {
    position: fixed;
    bottom: 70px;
    right: 10px;
    padding: 0.7em;
    color: #ffffff80;
    transition: 0.3s;
    font-size: 22px;
}

.page_top_btn:hover {
    color: #ffffff;
}


/* Responsive */

@media screen and (min-width:600px) {
    body::before {
        background-position: 50% 25%;
    }
    #menu-footer {
        display: none;
    }
    #menu-side {
        display: block;
        position: fixed;
        top: 40%;
        right: 10%;
        font-size: 18px;
        z-index: 99;
    }
    #menu-side ul {
        display: flex;
        flex-direction: column;
        list-style: none;
        padding-left: 0;
    }
    #menu-side ul li {
        margin-bottom: 20px;
    }
    #menu-side ul li a {
        color: #999;
        margin: 4px;
    }
    #page_top {
        height: 100vh;
    }
    #page_top p {
        margin: 320px auto 0 auto;
    }
    #page_top img {
        margin: 0 auto 200px auto;
    }
    .page_top_btn {
        padding: 0;
        right: 10%;
    }
    footer {
        padding-bottom: 30px;
    }
}