:root{--main-text:#313131;--main-bg:#fff;--link-color:#00f;--nav-border-color:#001f3f}@media (prefers-color-scheme:dark){:root{--main-text:#e4e4e4;--main-bg:#444;--link-color:#e39777;--nav-border-color:gray}}body{color:var(--main-text);background-color:var(--main-bg);margin:1em;font:14px/1.6 Hiragino Kaku Gothic Pro,Osaka,メイリオ,ＭＳ Ｐゴシック,MS PGothic,Verdana,Arial,sans-serif}img{border-style:none;outline:none}a,a:visited{color:var(--link-color);transition:all .5s}a:hover{color:orange;text-decoration:none;transition:all .5s}header{display:block}nav{border-top:1px solid;border-bottom:1px solid;border-color:var(--nav-border-color);margin-bottom:5px;overflow:hidden}footer small{font-size:.8rem}footer small .copyright{vertical-align:-.1em;font-size:1.2rem}