@charset "utf-8";
/* CSS Document */
body {
    background: #1A1A1A;
}

#container {
    width: 100%;
    height: 100%;
    display: flex;
    position: relative;
    min-height: 100vh;
}

#container a {
    position: relative;
    transition: all 0.3s ease;
    color: #9ce;
}

#contents {
    width: 100%;
    padding-left: 80px;
}

nav {
    width: 80px;
    height: 100vh;
    left: 0;
    flex: 1 0 auto;
    background-color: #1A1A1A;
    transition: all 0.3s ease;
    position: fixed;
    z-index: 999;
}

nav a:first-child {
    display: block;
    background: url(images/nav_top.png) no-repeat center /contain;
    width: 60px;
    height: 60px;
    position: fixed;
    top: 10px;
    left: 10px;
}

#side_contents {
    position: fixed;
    width: calc(100% - 80px);
    height: 100vh;
    top: 0;
    bottom: 0;
    font-weight: bold;
    left: calc(-100% + 80px);
    z-index: 998;
    color: #FFF;
    background: rgba(26,26,26,0.9);
    opacity: 0;
    padding: 0 30px;
    transition: all 1s ease;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

#side_contents ul {
    list-style: none;
    padding-left: 0;
    width: 50%;
}

#side_contents li {
    margin: 0;
}

#side_contents li a {
    color: currentColor;
    padding: 15px;
    display: block;
    text-decoration: none;
    text-align: center;
}

#side_contents ul:first-child a:hover {
    color: #ff8dbb;
    opacity: 1;
}

#tab-1:checked + #side_contents {
    left: 80px;
    opacity: 1;
}

input#tab-1 {
    display: none;
}

#slide-starter {
    position: absolute;
    top: 0; bottom: 0; left: 0; right: 0;
    margin: auto;
    width: 49px; height: 39px;
    cursor: pointer;
    transition: all 0.3s ease;
}

#slide-starter b {
    position: absolute;
    font-size: 1.3rem;
    color: #FFF;
    top: -15px;
    width: 100%;
    text-align: center;
    left: 0;
    right: 0;
}

#slide-starter span {
    background: #fff;
    display: block;
    width: 35px;
    height: 5px;
    margin: 9px auto;
    transition-duration: 1s;
}

#tab-1:checked ~ nav span:nth-of-type(1) {
  -webkit-transform: translateY(9px) rotate(-45deg);
  transform: translateY(9px) rotate(-45deg);
    transition-duration: 1s;
}
#tab-1:checked ~ nav span:nth-of-type(2) {
  -webkit-transform: translateY(-5px) rotate(45deg);
  transform: translateY(-5px) rotate(45deg);
    transition-duration: 1s;
}

#topicPath {
    display: none;
}

#breadcrumb {
    color: #FFF;
    margin: 0 0 20px;
}

#breadcrumb a {
    color: currentColor;
    text-decoration: none;
}

#breadcrumb li {
    display: inline;
}

#breadcrumb li:not(:first-child)::before {
    content:' > '
}

footer {
    width: 100%;
    padding: 0 20px;
    text-align: center;
    font-weight: normal;
    left: 0;
    right: 0;
    bottom: 0;
    position: absolute;
    font-size: 1.1rem;
}

#return_top {
    position: absolute;
    bottom: 5px;
    width: calc(100% - 80px);
    right: 0;
    text-align: center;
}

#return_top a {
    color: #FFF;
    padding: 10px;
    display: inline-block;
}