body {
    font-family: 'Ubuntu', sans-serif;
    font-size: 19px;
}

h1,
h2,
h3,
h4 { margin: 1rem 0; }

.header-link {
    position: absolute;
    margin-left: .2em;
    opacity: 0;
}

h1:hover .header-link,
h2:hover .header-link,
h3:hover .header-link,
h4:hover .header-link {
    opacity: 100;
}

.sidebar h1 .header-link,
.sidebar h2 .header-link,
.sidebar h3 .header-link,
.sidebar h4 .header-link {
    display: none;
}

a { color: #212529; }

a:hover { color: #707275; }

blockquote {
    border-left: 4px solid #212529;
    margin: 1rem 0;
    padding: 0.2rem 1rem;
    color: #212529;
}

blockquote p { margin: 0; }

/* Details and summary */

details, summary {
    display: block;
    margin: 1rem 0;
    transition: 200ms linear;
}

summary {
    cursor: pointer;
    transition: .3s;
}

/* Hide defaul marker */
details > summary { list-style: none; }
details summary::-webkit-details-marker { display: none; }

details[open] summary ~ * {
  animation: open 0.3s ease-in-out;
}

@keyframes open {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

details summary:before {
    content: '+';
    font-family: 'Ubuntu Mono';
    font-size: 20px;
    display: inline-flex;
    padding: 0 0.3rem;
}

details[open] summary:before {
    content: '-';
    font-family: 'Ubuntu Mono';
    font-size: 20px;
    display: inline-flex;
    padding: 0 0.3rem;
}

/* Code styling */

code,
pre {
    font-family: 'Ubuntu Mono', monospace;
    font-size: 19px;
    color: #d0d0d0;
}

pre code { background: unset; padding: unset; }

pre {
    background: #1c1d21;
    border-radius: 6px;
    padding: 1rem;
}

code {
    color: #1c1d21;
    background: #ffeff0;
    padding: 4px;
    border-radius: 6px;
}

.raw-pre {
    color: unset;
    background: unset;
}

/* Large headings */
.large-h { font-size: 42px; }
.title-h { font-size: 72px; line-height: 1.1; }

/* Blank spaces */
.blank-1 { display: block; height: 1rem; }
.blank-2 { display: block; height: 2rem; }
.blank-5 { display: block; height: 5rem; }

/* Sign in form */

.form-signin {
    position: absolute;
    left: 50%;
    top: 45%;
    transform: translate(-50%,-50%);
    min-width: 360px;
}

#inputPassword { margin-bottom: 8px; }

/* Sign out button */

.signout-btn {
    z-index: 1001;
    position: fixed;
    top: 16px;
    right: 1rem;
    height: 46px;
    width: 46px;
    text-align: center;
    border-radius: 3px;
    cursor: pointer;
}

.signout-btn i {
   font-size: 30px;
   line-height: 46px;
}

.signout-btn a { color: #212529; }

/* 404 page */

.page_not_found {
    position: absolute;
    left: 50%;
    top: 45%;
    transform: translate(-50%,-50%);
    text-align: center;
}

/* Header bar */

.header {
    display: block;
    position: fixed;
    height: 5rem;
    background: unset;
}

/* Sidebar */

.sidebar-toggle-btn {
    z-index: 1001;
    position: fixed;
    top: 1rem;
    left: 316px;
    height: 46px;
    width: 46px;
    text-align: center;
    border-radius: 3px;
    cursor: pointer;
    transition: left 0.4s ease;
}

.sidebar-toggle-btn.click { left: 1rem; }

.sidebar-toggle-btn i {
    font-size: 26px;
    line-height: 46px;
}

.sidebar {
    z-index: 1000;
    position: fixed;
    width: 300px;
    height: 100%;
    left: 0px;
    padding: 1rem;
    overflow: auto;
    transition: left 0.4s ease;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    background: #ffffff;
}

.sidebar.hide { left: -300px; }

/* Side menu */

.sidebar a {
    display: block;
    width: auto;
    padding: 2px 0;
    text-decoration: none;
    transition: 0.2s linear;
    color: #212529;
}

.sidebar a:hover { text-decoration: underline; }

.sidebar ul,
.sidebar ol,
.sidebar li {
    list-style-type: none;
    list-style-position: inside;
    position: relative;
    padding: 3px 0 3px 10px;
    margin: 0;
    color: #6c757d;
}

.mark {
    display: inline;
    left: -10px;
    bottom: 1px;
    width: 100%;
    padding: 4px;
    border-radius: 6px;
    position: absolute;
    color: #ffffff;
    background: unset;
}

.mark:hover { color: #212529; }
.mark::before { content: '•'; }

/* Content container toggle */

.content {
    margin-left: 300px;
    transition: margin-left 0.5s;
}

.content.wide { margin-left: 0px; }

/* Back to top button */

.to-top-btn {
    z-index: 1001;
    display: none;
    position: fixed;
    height: 100%;
    width: 3rem;
    top: 5rem;
    left: 315px;
    cursor: pointer;
    text-align: center;
    transition: left 0.4s ease;
}

.to-top-btn i {
    font-size: 26px;
    line-height: 46px;
}

.to-top-btn.wide { left: 15px; }
.to-top-btn.show { display: block; }

/* Content block */

article {
    display: block;
    margin: auto;
    padding: 1rem;
    max-width: 840px;
}

article.wide { max-width: 980px; }

/* Responsivity */

@media (max-width: 1200px) {
    .header { background: #ffffff; }
    .sidebar { left: -300px; }
    .sidebar-toggle-btn { left: 1rem; }
    .content { margin-left: 0px; }
    .sidebar.hide { left: 0px; }
    .sidebar-toggle-btn.click { left: 316px; }
    .to-top-btn.show { display: none; }
    article.wide { max-width: 840px; }
}