:root[lang="en-GB"] {
  font-family: "Museo", "Helvetica Neue", "Helvetica", Arial, sans-serif;
  font-size: 18px;
}

:root[lang="ja-JP"] {
  font-family: "ヒラギノ角ゴ Pro W3", "Hiragino Kaku Gothic Pro", "Osaka", "メイリオ", "Meiryo", "ＭＳ Ｐゴシック", "MS PGothic", "Helvetica Neue",
    "Helvetica", Arial, sans-serif;
  font-size: 15.6px;
}

:root[lang="zh-CN"] {
  font-family: "华文细黑", "STXihei", "PingFang TC", "微软雅黑体", "Microsoft YaHei New", "微软雅黑", "Microsoft Yahei", "宋体", "SimSun",
    "Helvetica Neue", "Helvetica", Arial, sans-serif;
  font-size: 16.7px;
}

:root {
  background: #eee;
  background-image: url(images/paper.png);
  padding: 0;
  margin: 0;

  --note-block-color: rgb(255, 255, 246);
  --code-block-color: rgba(0, 0, 0, 0.03);
  --heading-color: #cfe6ff;
  --heading-text: #333;

  --line-numbers: 2.2em;
  --side-padding: 2em;
  --line-height: 16px;
}

body {
  margin: 0 auto;
  width: auto;
  background: #fff;
  box-shadow: 0 0 24px 16px white;
  color: black;

  --body-padding: 0.5em;
  padding: var(--body-padding);
}

@media screen and (min-width: 576px) {
  body {
    width: 540px;
  }
}
@media screen and (min-width: 768px) {
  body {
    --body-padding: 1em;
    width: 720px;
    padding: 1em;
  }
}
@media screen and (min-width: 992px) {
  body {
    width: 960px;
  }
}
@media screen and (min-width: 1200px) {
  body {
    width: 1140px;
  }
}

a,
a:visited {
  color: rgb(0, 0, 238);
}

/* --------------------- */

h1 {
  background: var(--heading-color);
  color: var(--heading-text);
  padding: 0.2em 0.5em;
}

body header h1:first-child {
  margin-top: 0;
}

h1 div.nav {
  float: right;
  font-size: 0.6em;
  padding-top: 0.4em;
}

h1 div.nav a + a {
  margin-left: 1em;
}

header h2 + div {
  text-align: center;
}

ul.lang-switcher {
  display: inline;
  text-indent: 0;
  padding: 0;
  margin: 0;
}

ul.lang-switcher li {
  display: inline;
  text-indent: 0;
  padding: 0 0.2em;
  margin: 0;
}
ul.lang-switcher + p {
  font-size: 85%;
  margin: 0;
}

@media screen and (min-width: 992px) {
  ul.lang-switcher + p {
    display: inline;
    margin-left: 0.25em;
    font-size: 75%;
  }
}

/* --------------------- */

label[for="changelogtoggle"] {
  display: inline-block;
  cursor: pointer;
  color: #2929b3;
  margin-left: 2em;
}

header nav h4 {
  text-indent: 1em;
}

header nav ol {
  margin: 0;
}

main {
  min-height: 75vh;
}

#changelogtoggle {
  display: none;
}

#changelogtoggle:not(:checked) ~ * {
  display: none;
}

/* --------------------- */

#chapters {
  counter-reset: section;
}

#chapters section h1:before {
  counter-increment: section;
  content: "§" counter(section);
  margin-right: 1em;
}

@media screen and (min-width: 768px) {
  #chapters section h1 {
    position: sticky;
    top: 0;
    z-index: 2;
    border-bottom: 1px solid black;
  }
}

#chapters section > h1 > a {
  text-decoration: none;
  color: inherit;
}

/* --------------------- */

div.print {
  display: none;
}

div.howtocode {
  position: relative;
  border: 1px solid black;
  background: #fcfcfd;
  margin: 1em;
  padding: 1em 1em 0 1em;
}

div.howtocode h3 {
  box-sizing: border-box;
  position: relative;
  width: calc(100% + 2em - 4px);
  left: calc(-1em + 2px);
  background: var(--heading-color);
  color: var(--heading-text);
  padding: 0.2em;
  margin: 0 auto;
  margin-top: -1em;
  border: 1px solid black;
  border-bottom: none;
}

div.note {
  position: relative;
  border: 1px solid black;
  background: var(--note-block-color);
  margin: 1em;
  margin-top: 2em;
  padding: 1em 1em 0 1em;
}

div.note:before {
  display: inline-block;
  content: "Note";
  border: 1px solid black;
  border-radius: 0.5em;
  background: orange;
  padding: 0.2em 0.5em;
  position: absolute;
  top: -0.5em;
  left: -1em;
}

/* --------------------- */

img.LaTeX.SVG {
  margin: 0;
  background: white;
  padding: 1em 1em 0.25em 0;
  border-radius: 0.3em;
}

/* The next two rules are a wonky fix for paragraph vs. image margins */

p + img.LaTeX.SVG {
  margin-top: -0.9em;
}

img.LaTeX.SVG + p {
  margin-top: 0.5em;
}

div.note img.LaTeX.SVG {
  background: var(--note-block-color);
}

pre img.LaTeX.SVG {
  background: var(--code-block-color);
}

@media screen and (min-width: 768px) {
  img.LaTeX.SVG {
    margin-left: 1em;
  }
}

/* --------------------- */

graphics-element {
  background: #e8e8e8;
}

table.slider-wrapper {
  font-size: 75%;
  background: white;
  border: 1px solid black;
  border-collapse: collapse;
  margin-top: 0.5em;
}

.slider-wrapper tr td {
  width: 100%;
}

.slider-wrapper tr td:first-child {
  width: 3em;
  white-space: nowrap;
}

.slider-wrapper tr td:last-child {
  width: 3em;
  white-space: nowrap;
  padding-left: 1em;
}

.slider-wrapper .slider-label {
  font-family: Arial;
  padding: 0 0.5em;
}

.slider-wrapper .slider-value {
  padding: 0 0.25em;
  text-align-last: center;
}

.slider-wrapper .slider {
  width: 100%;
  vertical-align: text-top;
}

.grid {
  display: flex;
  flex-wrap: wrap;
}

/* --------------------- */

hr {
  width: calc(100% + 2 * var(--body-padding));
  position: relative;
  left: calc(-1 * var(--body-padding));
  border: none;
  border-top: 1px solid black;
  margin: 1em 0 2em 0;
}

div.scl img[usemap] {
  cursor: pointer;
}

div.dev,
div.scl,
div.github {
  z-index: 10;
}

div.dev {
  background: rgb(43, 49, 95);
  color: rgb(81, 181, 255);
  position: fixed;
  transform: rotate(-45deg);
  width: 22em;
  text-align: center;
  top: 4em;
  left: -6em;
  font-variant: small-caps;
  font-weight: bolder;
  font-family: Helvetica;
  box-shadow: 0px 5px 7px 2px rgba(0, 0, 0, 0.3);
  opacity: 0.2;
}

div.scl {
  display: none;
}

/* --------------------- */

@media screen and (min-width: 768px) {
  div.scl {
    display: block;
    position: fixed;
    top: 0.25em;
    left: 0.25em;
  }
}

div.github {
  --scale: 0;
  position: fixed;
  top: 0;
  right: 0;
  height: 0;
  overflow: visible;
  transform-origin: top right;
  transform: scale(var(--scale));
}
@media screen and (min-width: 992px) {
  div.github {
    --scale: 0.4;
  }
}
@media screen and (min-width: 1200px) {
  div.github {
    --scale: 0.5;
  }
}
@media screen and (min-width: 1470px) {
  div.github {
    --scale: 0.75;
  }
}
@media screen and (min-width: 1600px) {
  div.github {
    --scale: 0.9;
  }
}

div.github img area {
  cursor: pointer;
}

/* --------------------- */

h5.post-date {
  text-align: right;
}

/* --------------------- */

li code,
p code {
  display: inline-block;
  border: 1px solid #ddd;
  border-radius: 5px;
  padding: 0 5px;
  background: #eee;
  font-weight: bold;
  vertical-align: 1px;
}

pre {
  display: inline-block;
  margin-left: 0;
  background-color: var(--code-block-color);
  padding: 0.5em;
  border: 1px dotted gray;
}

@media screen and (min-width: 768px) {
  pre {
    margin-left: 1em;
  }
}

code {
  font-family: Courier;
}

table.code {
  border-collapse: collapse;
  margin: 0;
  margin-left: var(--side-padding);
  width: calc(100% - 3 * var(--side-padding));
  border: 0.5em solid #f0f0f0;
  border-width: 0.5em 0;
}

table.code td {
  background: #f0f0f0;
  border: none;
  padding: 0;
  cursor: default;
}

table.code td,
table.code td textarea {
  font-family: Courier;
  font-size: 16px;
  white-space: pre;
}

table.code td textarea {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
  resize: none;
  cursor: text;
  color: inherit;
  padding-left: 1em;
  background: transparent;
  overflow: hidden;
}

table.code tr td[rowspan] {
  position: relative;
}

table.code tr td:first-child {
  width: 1.5em;
  padding-right: 0.25em;
  text-align: right;
  user-select: none;
  color: #999;
  cursor: default;
  border-right: 1px solid red;
}

/* --------------------- */

a.rss-link {
  position: relative;
  z-index: 10;
  float: right;
}

/* --------------------- */