:root {
    --max-width: 900px;
    --min-height: 600px;
    --header-div-padding-top: 30px;
    --header-div-padding-bottom: 5px;
    --header-nav-padding-top: 5px;
    --header-nav-padding-right: 20px;
    --header-nav-padding-bottom: 10px;
    --header-nav-padding-left: 20px;
    --header-nav-ul-li-padding-top: 0px;
    --header-nav-ul-li-padding-right: 20px;
    --header-nav-ul-li-padding-bottom: 0px;
    --header-nav-ul-li-padding-left: 20px;
    --container-padding-top: 10px;
    --container-padding-right: 20px;
    --container-padding-bottom: 40px;
    --container-padding-left: 20px;
    --main-padding-top: 10px;
    --main-padding-right: 20px;
    --main-padding-bottom: 10px;
    --main-padding-left: 20px;
    --main-article-padding-top: 10px;
    --main-article-padding-right: 0px;
    --main-article-padding-bottom: 10px;
    --main-article-padding-left: 0px;
    --footer-padding-top: 20px;
    --footer-padding-bottom: 40px;
    /* --body-background-color: #f5f5f5; */
    /* --body-background-color: #f8fbff; */
    --body-background-color: #ffffff;
    /* --header-background-color: #383e45; */
    --header-background-color: #ffffff;
    --nav-background-color: #f5f5f5;
    --main-article-background-color: white;
    --footer-background-color: #ffffff;
    /* --footer-background-color: #383e45; */
}

* {
    /* border: 1px solid #ccc; */
    margin: 0;
    padding: 0;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, Verdana, Arial, sans-serif;
    color: #444;
}
 
body {
    background-color: var(--body-background-color);
}

header {
    background-color: var(--header-background-color);
    /* box-shadow: 0 3px 6px rgba(0, 0, 0, 0.1); これを付け足し */
    border-bottom: 1px solid #bbb;
}

header div {
    padding-top: var(--header-div-padding-top);
    padding-bottom: var(--header-div-padding-bottom);
    text-align: center;
    font-weight: bold;
    /* color: #444; */
    font-size:35px;
    line-height:35px;
    /* letter-spacing:-1px; */
    /* text-shadow:5px 5px 10px #888; */
    /* text-shadow:1px 1px 3px #fff,3px 3px 6px #888; */
}

header div a {
    color: #444;
}
header div a:hover {
    color: #444;
  }
header nav {
    max-width: var(--max-width);
    margin-left: auto;
    margin-right: auto;
    padding-top: var(--header-nav-padding-top);
    padding-right: var(--header-nav-padding-right);
    padding-bottom: var(--header-nav-padding-bottom);
    padding-left: var(--header-nav-padding-left);
}

header nav ul {
    list-style-type: none;
    display: flex;
    justify-content:flex-end;

}

header nav ul li {
    padding-top: var(--header-nav-ul-li-padding-top);
    padding-right: var(--header-nav-ul-li-padding-right);
    padding-bottom: var(--header-nav-ul-li-padding-bottom);
    padding-left: var(--header-nav-ul-li-padding-left);
}

header nav ul li a {
    /* color: #24292e; */
    /* color: #f8fbff */
    /* color: #444; */
}

header nav ul li a:hover {
    opacity: 0.7;
}

header > nav > ul a {
    display: block;
    text-decoration: none;
    font-weight: bold;
    padding: 0.375em 1.125em;
  }
header > nav > ul a:hover {
    background: #eee;
    border-radius: 0.5em;
    color: darkcyan;
  }
  header > nav > ul a:focus {
    background: #eee;
    border-radius: 0.5em;
    border: 0.125em solid darkcyan;
    padding: 0.25em 1em;
    outline: none;
  }

#breadcrumb {
    line-height: 20px;
    max-width: var(--max-width);
    margin-left: auto;
    margin-right: auto;
    
    padding-top: 20px;
    padding-right: 20px;
    padding-bottom: 0px;
    padding-left: 20px;
}

#breadcrumb ul {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    margin: 0;
    padding: 0;
}
    
#breadcrumb li:not(:last-child)::after {
    display: inline-block;
    margin: 0 .25rem;
    content: ">";
}

#breadcrumb a {
    color: #444;
}

#container {
    max-width: var(--max-width);
    min-height: var(--min-height);
    margin-left: auto;
    margin-right: auto;
    padding-top: var(--container-padding-top);
    padding-right: var(--container-padding-right);
    padding-bottom: var(--container-padding-bottom);
    padding-left: var(--container-padding-left);
    display: flex;
    justify-content: space-between;
}

#container main {
    width: 80%;
    background-color: var(--main-article-background-color);
    padding-top: var(--main-padding-top);
    padding-right: var(--main-padding-right);
    padding-bottom: var(--main-padding-bottom);
    padding-left: var(--main-padding-left);
    border-top-left-radius: 10px;
    border-top-right-radius: 10px;
    border-bottom-right-radius: 10px;
    border-bottom-left-radius: 10px;

}

#container main article {

    padding-top: var(--main-article-padding-top);
    padding-right: var(--main-article-padding-right);
    padding-bottom: var(--main-article-padding-bottom);
    padding-left: var(--main-article-padding-left);
}

#container aside {
    width: 18%;
    background-color: var(--main-article-background-color);
    padding-top: var(--main-article-padding-top);
    padding-right: var(--main-article-padding-right);
    padding-bottom: var(--main-article-padding-bottom);
    padding-left: var(--main-article-padding-left);
    border-top-left-radius: 10px;
    border-top-right-radius: 10px;
    border-bottom-right-radius: 10px;
    border-bottom-left-radius: 10px;
}

footer {
    background-color: var(--footer-background-color);
    margin-left: auto;
    margin-right: auto;
    text-align: center;
    padding-top: var(--footer-padding-top);
    padding-bottom: var(--footer-padding-bottom);
    font-size: 0.875rem;
    /* color: #f8fbff */
    border-top: 1px solid #bbb;
}

hr {
    margin: 3.75rem 0;
    padding: 0;
    border: 1px dashed #ddd;
  }

a {
    text-decoration: none;
}
/* リンクテキストのスタイル */
a {
    background-color: transparent;
    color: darkcyan;
  }
  a:hover {
    color: mediumturquoise;
  }

/* 見出し */
h1 {
    font-size: 2rem;
    margin: 1em 0 0.5em;
    line-height: 1.4;
    color: #444;
  }
  @media (min-width: 20em) {
    h1 {
      font-size: calc(2rem + 0.625 * (100vw - 20em) / 55);
    }
  }
  @media (min-width: 75em) {
    h1 {
      font-size: 2.625rem;
    }
  }
  
  h2 {
    font-size: 1.764705882rem;
    margin: 1.3125em 0 0.65625em;
    line-height: 1.5;
    color: #444;
  }
  @media (min-width: 20em) {
    h2 {
      font-size: calc(1.764705882rem + 0.235294118 * (100vw - 20em) / 55);
    }
  }
  @media (min-width: 75em) {
    h2 {
      font-size: 2rem;
    }
  }
  h1 + h2 {
    margin: 0.65625em 0;
  }
  
  h3 {
    font-size: 1.433823529rem;
    margin: 1.615384616em 0 0.807692308em;
    line-height: 1.6;
    color: #444;
  }
  @media (min-width: 20em) {
    h3 {
      font-size: calc(1.433823529rem + 0.191176471 * (100vw - 20em) / 55);
    }
  }
  @media (min-width: 75em) {
    h3 {
      font-size: 1.625rem;
    }
  }
  h2 + h3 {
    margin: 0.807692308em 0;
  }
  
  h4 {
    font-size: 0.992647059rem;
    margin: 2.333333334em 0 1.166666667em;
    line-height: 2;
    color: #444;
  }
  @media (min-width: 20em) {
    h4 {
      font-size: calc(0.992647059rem + 0.132352941 * (100vw - 20em) / 55);
    }
  }
  @media (min-width: 75em) {
    h4 {
      font-size: 1.125rem;
    }
  }
  h3 + h4 {
    margin: 1.166666667em 0;
  }
  
  /* 本文 */
  p {
    font-size: 0.9375rem;
    margin: 1em 0;
    line-height: 2.1;
  }
  @media (min-width: 20em) {
    p {
      font-size: calc(0.9375rem + 0.125 * (100vw - 20em) / 55);
    }
  }
  @media (min-width: 75em) {
    p {
      font-size: 1.0625rem;
    }
  }
  
  /* コンテンツ内のナビゲーションリンク一覧 */
main nav ul {
    list-style: none;
    margin-left: 0;
    padding-left: 0.625em;
  }
  main nav ul li {
    position: relative;
    padding-left: 1.125rem;
  }
  main nav ul li::before {
    position: absolute;
    top: 0.5rem;
    left: 0;
    content: "";
    display: inline-block;
    width: 0;
    height: 0;
    border-top: 6px solid transparent;
    border-bottom: 6px solid transparent;
    border-left: 10px solid darkcyan;
  }

/* 段落と一覧（ulとol） */
/* ul, ol {
    font-size: 0.9375rem;
    margin: 1.6em 0;
    line-height: 1.7;
  } */
main ul, ol {
    font-size: 0.9375rem;
    margin: 1.6em 0;
    line-height: 1.7;
  }
/* 追加 */
main ul, ol {
  margin: 1.6em 2em;
}

  @media (min-width: 20em) {
    ul, ol {
      font-size: calc(0.9375rem + 0.125 * (100vw - 20em) / 55);
    }
  }
  @media (min-width: 75em) {
    ul, ol {
      font-size: 1.0625rem;
    }
  }
  ul ul, ul ol, ol ul, ol ol {
    margin: 1em 0 1.4em;
  }
  ul ul, ol ul {
    padding: 0 0 0 1.4em;
  }
  ul ol, ol ol {
    padding: 0 0 0 1.6em;
  }
  
  ul {
    padding: 0 0 0 2.1em;
  }
  ul li {
    padding: 0 0 0 0.2em;
  }
  
  li {
    margin: 0 0 0.8em;
  }
  

  main nav ul a {
    text-decoration: none;
  }
  
@media screen and (max-width: 767px) {
    #container main {
        width: 100%;
    }
    aside {
        display:none ;
    }
}