html {
  --black-opacity: #0000001a;
  --blockquote-background: #f9f9f9;
  --body-background: #eff0f1;
  --body-text: #555559;
  --code-text: #d63384;
  --hr: #606c71;
  --link-text-hover: #0a58ca;
  --link-text: #3082d4;
  --navbar: #BC0A4D;
  --navbar-text: #ffffff;
  --page-separator: #c9c9c9;
  --pre-background: #e0e1e2;
  --pre-border: #dce6f0;
  --table: #606c71;
  --webkit-placeholder: #919090;
}

/* The dark-mode colors must be set after the light-mode colors */

@media (prefers-color-scheme: dark) {
  html {
    --blockquote-background: #282525;
    --body-background: #525252;
    --body-text: #dadadd;
    --code-text: #cd60c0;
    --hr: #cfd4d6;
    --link-text-hover: #2d7aee;
    --link-text: #58acff;
    --page-separator: #a5a5a5;
    --pre-background: #363839;
    --pre-border: #1c2024;
    --table: #cfd4d6;
  }
}

#anchor a {
  position: absolute;
  top: -3rem;
}

#anchor {
  position: relative;
}

.btn {
  font-size: 20px;
}

.form-control:-ms-input-placeholder {
  color: var(--webkit-placeholder);
  opacity:1
}

.form-control::-moz-placeholder {
  color: var(--webkit-placeholder);
  opacity:1
}

.form-control::-ms-input-placeholder {
  color: var(--webkit-placeholder);
  opacity:1
}

.form-control::placeholder {
  color: var(--webkit-placeholder);
  opacity: 1;
}

.four-0-four {
  height: 50%;
  padding-bottom: 2rem;
  padding-top: 2rem;
}

.image {
  max-width: 100%;
  padding-bottom: .625rem;
}

.invisible {
  display: none;
}

.page-body {
  padding-top: 1rem;
}

.page-header {
  border-bottom: solid .125rem var(--page-separator);
  margin-bottom: 10px;
  padding-bottom: 10px;
}

.subtitle {
  font-size: 22px;
  font-style: italic;
}

.table {
  --bs-table-bg: transparent;
  --bs-table-color: var(--table);
}

.table-div {
  padding-bottom: 1rem;
}

::-webkit-input-placeholder {
  color: var(--webkit-placeholder);
  opacity:1
}

a {
  color: var(--link-text);
  text-decoration: none;
}

a:hover:not(.btn, .dropdown-item, .photoswipe) {
  color: var(--link-text-hover);
  text-decoration: underline;
}

body {
  align-items: stretch;
  color: var(--body-text);
  display: flex;
  flex-direction: column;
  font-family: "Palatino", "Mulish", "system-ui";
  font-size: 20px;
  height: 100%;
  line-height: 1.5;
}

body, html {
  background-color: var(--body-background);
  min-height: 100vh;
  min-width: 20rem;
  position: relative;
  width: 100%;
}

code {
  color: var(--code-text);
}

footer {
  border-top: solid .125rem var(--page-separator);
  bottom: 0;
  font-size: 12px;
  left: 0;
  margin-top: 1rem;
  padding-bottom: .5rem;
  padding-top: .5rem;
  text-align: center;
  width: 100%;
}

footer, header, main {
  flex-shrink: 0;
}

h2 {
  font-size: 32px;
}

h3 {
  font-size: 28px;
}

h4 {
  font-size: 24px;
  font-weight: bold;
}

hr {
  border-top: .15rem solid var(--hr);
  margin-bottom: 2rem;
  margin-left: 5%;
  margin-top: 2rem;
  width: 90%;
}

main {
  flex-grow: 1;
  font-size: 20px;
  margin-top: 1.5rem;
}

pre {
  -webkit-overflow-scrolling: touch;
  background-color: var(--pre-background);
  border-radius: .3rem;
  border: solid .0625rem var(--pre-border);
  font-family: "Roboto Mono", monospace;
  font-size: 16px;
  margin-bottom: 1rem;
  margin-top: 0;
  overflow: auto;
  padding: .8rem;
  width: 100%;

  > code {
    background: transparent;
    border: 0;
    font-size: 16px;
    margin: 0;
    padding: 0;
    word-break: normal;
    word-wrap: normal;
  }
}

blockquote {
  background: var(--blockquote-background);
  margin-bottom: 0.625rem;
  margin-left: 0.625rem;
  margin-right: 0.625rem;
  margin-top: 0rem;
  padding: 0.5rem 0.625rem;
  quotes: "\201C""\201D""\2018""\2019";

  p {
    margin-bottom: 0.125rem;
    margin-top: 0.125rem;
  }
}

nav.navbar {
  background: var(--navbar);

  .navbar-brand {
    font-weight: 700;
  }

  .navbar-nav > .nav-item > .nav-link {
    color: var(--navbar-text);
    font-size: 1.1rem;
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .navbar-nav > .nav-item.active > .nav-link {
    text-decoration: underline;
  }

  .navbar-toggler[aria-expanded="false"] > .nav-icon-x {
    display: none;
  }

  .navbar-toggler[aria-expanded="true"] > .nav-icon-menu {
    display: none;
  }

  > .container-fluid > .navbar-toggler {
    border-color: var(--navbar-text);
    color: var(--navbar-text);
  }

  dropdown-item, a:hover {
    text-decoration: underline;
  }
}

/* https://jwarby.github.io/jekyll-pygments-themes/languages/ruby.html
https://github.com/rouge-ruby/rouge/wiki/List-of-supported-languages-and-lexers */
.highlight .hll { background-color: #ffffcc }
.highlight .c { color: #aaaaaa; font-style: italic } /* Comment */
.highlight .err { color: #F00000; background-color: #F0A0A0 } /* Error */
.highlight .k { color: #0000aa } /* Keyword */
.highlight .cm { color: #aaaaaa; font-style: italic } /* Comment.Multiline */
.highlight .cp { color: #4c8317 } /* Comment.Preproc */
.highlight .c1 { color: #aaaaaa; font-style: italic } /* Comment.Single */
.highlight .cs { color: #0000aa; font-style: italic } /* Comment.Special */
.highlight .gd { color: #aa0000 } /* Generic.Deleted */
.highlight .ge { font-style: italic } /* Generic.Emph */
.highlight .gr { color: #aa0000 } /* Generic.Error */
.highlight .gh { color: #000080; font-weight: bold } /* Generic.Heading */
.highlight .gi { color: #00aa00 } /* Generic.Inserted */
.highlight .go { color: #888888 } /* Generic.Output */
.highlight .gp { color: #555555 } /* Generic.Prompt */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #800080; font-weight: bold } /* Generic.Subheading */
.highlight .gt { color: #aa0000 } /* Generic.Traceback */
.highlight .kc { color: #0000aa } /* Keyword.Constant */
.highlight .kd { color: #0000aa } /* Keyword.Declaration */
.highlight .kn { color: #0000aa } /* Keyword.Namespace */
.highlight .kp { color: #0000aa } /* Keyword.Pseudo */
.highlight .kr { color: #0000aa } /* Keyword.Reserved */
.highlight .kt { color: #00aaaa } /* Keyword.Type */
.highlight .m { color: #009999 } /* Literal.Number */
.highlight .s { color: #aa5500 } /* Literal.String */
.highlight .na { color: #1e90ff } /* Name.Attribute */
.highlight .nb { color: #00aaaa } /* Name.Builtin */
.highlight .nc { color: #00aa00; text-decoration: underline } /* Name.Class */
.highlight .no { color: #aa0000 } /* Name.Constant */
.highlight .nd { color: #888888 } /* Name.Decorator */
.highlight .ni { color: #800000; font-weight: bold } /* Name.Entity */
.highlight .nf { color: #00aa00 } /* Name.Function */
.highlight .nn { color: #00aaaa; text-decoration: underline } /* Name.Namespace */
.highlight .nt { color: #1e90ff; font-weight: bold } /* Name.Tag */
.highlight .nv { color: #aa0000 } /* Name.Variable */
.highlight .ow { color: #0000aa } /* Operator.Word */
.highlight .w { color: #bbbbbb } /* Text.Whitespace */
.highlight .mf { color: #009999 } /* Literal.Number.Float */
.highlight .mh { color: #009999 } /* Literal.Number.Hex */
.highlight .mi { color: #009999 } /* Literal.Number.Integer */
.highlight .mo { color: #009999 } /* Literal.Number.Oct */
.highlight .sb { color: #aa5500 } /* Literal.String.Backtick */
.highlight .sc { color: #aa5500 } /* Literal.String.Char */
.highlight .sd { color: #aa5500 } /* Literal.String.Doc */
.highlight .s2 { color: #aa5500 } /* Literal.String.Double */
.highlight .se { color: #aa5500 } /* Literal.String.Escape */
.highlight .sh { color: #aa5500 } /* Literal.String.Heredoc */
.highlight .si { color: #aa5500 } /* Literal.String.Interpol */
.highlight .sx { color: #aa5500 } /* Literal.String.Other */
.highlight .sr { color: #009999 } /* Literal.String.Regex */
.highlight .s1 { color: #aa5500 } /* Literal.String.Single */
.highlight .ss { color: #0000aa } /* Literal.String.Symbol */
.highlight .bp { color: #00aaaa } /* Name.Builtin.Pseudo */
.highlight .vc { color: #aa0000 } /* Name.Variable.Class */
.highlight .vg { color: #aa0000 } /* Name.Variable.Global */
.highlight .vi { color: #aa0000 } /* Name.Variable.Instance */
.highlight .il { color: #009999 } /* Literal.Number.Integer.Long */