
/* ----- Global settings ----------------------------------------------- {{{ */

:root {
  /* --- Colors --- */

  --background-color: #fff;

  --color-text: #1b2733;
  --color-text-secondary: #637282;
  --color-link: #0070e0;
  --color-sidenote: #616970;

  --highlight-red: #ea9999;
  --highlight-yellow: #ffe599;
  --highlight-green: #b6d7a8;
  --highlight-blue: #a4c2f4;
  --highlight-purple: #b4a7d6;

  --color-inline-code: #1b2733;
  --color-inline-code-bg: #f3f3f8;

  --color-border: #dfdfd0;
  --color-border-heavy: #ccccd4;

  --color-table-heading: #f3f3fb;

  /* --- Text --- */

  --font-family-prose: system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,Ubuntu,Cantarell,"Open Sans","Helvetica Neue",sans-serif;
  --font-family-heading: system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,Ubuntu,Cantarell,"Open Sans","Helvetica Neue",sans-serif;
  --font-family-code: Menlo, monospace;
  --side-note-number-font-family: var(--font-family-prose);

  --line-height: 26px;
  --font-size: 17px;

  --inline-code-font-size: 15px;
  --code-block-font-size: 14px;
  --code-block-side-padding: 8px;
  --line-numbers-font-size: 12px;

  --tight-code-line-height: 18px;
  --tight-code-padding-top: 5px;

  --side-note-line-height: 20px;
  --side-note-font-size: 13px;
  --side-note-code-font-size: 13px;
  --side-note-baseline-offset: 4px;
  --side-note-sup-offset: -6px;
  --side-note-number-hang-left: -6px;
  --side-note-text-indent: -9px;

  --heading-font-weight: 500;

  --title-font-size: 42px;
  --title-code-font-size: 40px;
  --title-line-height: 48px;
  --title-margin-top: 36px;

  --h1-font-size: 32px;
  --h1-code-font-size: 29px;
  --h1-line-height: 36px;
  --h1-word-spacing: 1px;
  --h1-margin-top: 30px;
  --h1-margin-bottom: 12px;

  --h2-font-size: 22px;
  --h2-code-font-size: 20px;
  --h2-line-height: 28px;
  --h2-word-spacing: 0.5px;
  --h2-margin-top: 18px;
  --h2-margin-bottom: 6px;

  --ul-indent-size: 23px;
  --ol-indent-size: 19px;
  --ol-li-padding-left: 4px;

  --hr-margin-top: 18px;
  --hr-margin-bottom: calc(var(--line-height) - var(--hr-margin-top) - 1px);

  --extra-wide-scale-factor: 1.5;

  --figcaption-line-height: 21px;
  --figcaption-font-size: 14px;
  --figcaption-code-font-size: 13px;
  --figcaption-gap: 6px;
  --captioned-figure-gap: 10px;

  --table-line-height: 21px;
  --table-font-size: 14px;
  --table-code-font-size: 13px;

  --nav-toc-font-size: 12px;
  --nav-toc-code-font-size: 12px;
  --nav-toc-indent: 15px;
  --nav-toc-baseline-offset: 2px;

  /* --- Layout --- */

  --main-width: 745px;
  /* The name doesn't indicate it, but this variable actually specifies an
   * effective minimum width. (It didn't previously behave this way, but the
   * change to do so was made in a backwards-compatible way, so the variable
   * was not renamed.)
   **/
  --main-width-narrow: 550px;
  --side-note-max-width: 300px;

}

/* @media (prefers-color-scheme: dark) { */
/*   :root { */
/*     --background-color: #161313; */
/**/
/*     --color-text: #f7f5f2; */
/*     --color-text-secondary: #9d9b99; */
/*     --color-link: #2994ff; */
/*     --color-sidenote: #b4b2af; */
/**/
/*     --highlight-red: #660000; */
/*     --highlight-yellow: #7f6000; */
/*     --highlight-green: #274e13; */
/*     --highlight-blue: #1c4587; */
/*     --highlight-purple: #351c75; */
/**/
/*     --color-inline-code: #f7f5f2; */
/*     --color-inline-code-bg: #242121; */
/**/
/*     --color-border: #393635; */
/*     --color-border-heavy: #524f4d; */
/**/
/*     --color-table-heading: #242121; */
/*   } */
/* } */

*, *:after, *:before {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: rgba(0,0,0,0);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html {
  /* https://github.com/edwardtufte/tufte-css/issues/81#issuecomment-261953409 */
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family-prose);
  color: var(--color-text);
  font-size: var(--font-size);
  line-height: var(--line-height);
  -webkit-font-variant-ligatures: no-common-ligatures;
  font-variant-ligatures: no-common-ligatures;

  /* Safari-only right now (macOS, iOS) but looks so good. */
  hanging-punctuation: first;

  margin: 0;
  padding: 0;
  padding-top: var(--title-margin-top);
  width: 100%;

  background-color: var(--background-color);
}

@media print {
  body {
    background-color: initial;
  }
}

/* }}} */
/* ----- Utility classes -----------------------------------------------  {{{ */
.only-light-mode {
  display: inherit;
}
.only-dark-mode {
  display: none;
}

@media (prefers-color-scheme: dark) {
  .only-light-mode {
    display: none;
  }
  .only-dark-mode {
    display: inherit;
  }
}
/* }}} */
/* ----- Side notes and margin notes ----------------------------------- {{{ */
/* --- Side note text and numbering --- {{{ */

.sidenote,
.marginnote {
  color: var(--color-sidenote);

  font-size: var(--side-note-font-size);
  line-height: var(--side-note-line-height);
  vertical-align: baseline;

  /* Align first baseline to body. */
  margin-top: var(--side-note-baseline-offset);
}

.sidenote code,
.marginnote code {
  color: var(--color-sidenote);
}

main {
  counter-reset: sidenote-counter;
}

.sidenote-number {
  counter-increment: sidenote-counter;
}

.sidenote-number:after,
.sidenote:before {
  content: counter(sidenote-counter);
  position: relative;
}

nav#TOC label,
label.margin-toggle:not(.sidenote-number),
.sidenote-number:after,
.sidenote:before,
.footnote-ref sup,
sup {
  font-size: var(--side-note-font-size);
  font-weight: 700;
  font-family: var(--side-note-number-font-family);
  -webkit-font-feature-settings: "tnum" 1;
  font-feature-settings: "tnum" 1;

  /* Mimic 'vertical-align: super' (browser style for sup tag)
   * without causing a gap in our text's implicit grid. */
  vertical-align: baseline;
  position: relative;
  top: var(--side-note-sup-offset);
}

sup {
  font-weight: inherit;
}

/* Make the superscript hang. */
.sidenote:before { left: var(--side-note-number-hang-left); }
/* Get first first column of first row to line up with other rows. */
.sidenote { text-indent: var(--side-note-text-indent); }

/*}}} */
/* --- Side note input controls --- {{{ */

input.margin-toggle {
    display: none;
}
label.margin-toggle:not(.sidenote-number) {
    display: none;
}
label.sidenote-number {
    display: inline;
}

/* Unfortunately, variables aren't in scope here.
 * See calculations in Horizontal layouting.
 */
@media screen and (max-width: calc(26px + 550px + 26px + 169px + 26px - 1px)) {
  .margin-toggle:checked + .sidenote,
  .margin-toggle:checked + .marginnote {
    margin-top: var(--side-note-line-height);
    vertical-align: baseline;
  }

  label.margin-toggle {
    color: var(--color-link);
  }

  label.margin-toggle:not(.sidenote-number) {
    display: inline;
  }

  label {
    cursor: pointer;
  }
}

/* }}} */
/* }}} */
/* ----- Headings ------------------------------------------------------ {{{ */

h1, h2 {
  font-family: var(--font-family-heading);
  font-weight: var(--heading-font-weight);
}

h4, h5, h6 {
  font-weight: normal;
}

h1.title {
  margin-top: var(--line-height);
  margin-bottom: var(--line-height);
  font-size: var(--title-font-size);
  line-height: var(--title-line-height);
}

h1.title code {
  font-size: var(--title-code-font-size);
}

h1:not(.title) {
  font-size: var(--h1-font-size);
  line-height: var(--h1-line-height);
  word-spacing: var(--h1-word-spacing);

  margin-top: var(--h1-margin-top);
  margin-bottom: var(--h1-margin-bottom);
}

h1:not(.title) code {
  font-size: var(--h1-code-font-size);
}

h2 {
  font-size: var(--h2-font-size);
  line-height: var(--h2-line-height);
  word-spacing: var(--h2-word-spacing);

  margin-top: var(--h2-margin-top);
  margin-bottom: var(--h2-margin-bottom);
}

h2 code {
  font-size: var(--h2-code-font-size);
}

h3 {
  font-size: var(--font-size);
  line-height: var(--line-height);
  font-weight: bold;
}

h1:not(.title) + *, h1:not(.title) + p { margin-top: var(--h1-margin-bottom); }
h2 + *, h2 + p                         { margin-top: var(--h2-margin-bottom); }
h3 + *, h3 + p                         { margin-top: 0; }

/* }}} */
/* ----- Prose --------------------------------------------------------- {{{ */

p, main > ul, main > ol, div.sourceCode, main > pre, img, table {
  margin-top: var(--line-height);
  margin-bottom: var(--line-height)
}

ul:not(.task-list) {
  margin-left: var(--ul-indent-size);
}
ol {
  margin-left: var(--ol-indent-size);
}

ul.task-list {
  list-style: none;
  margin-left: var(--ul-indent-size);
}

ul.task-list > li {
  position: relative;
}

ul.task-list > li > input[type="checkbox"] {
  position: absolute;
  left: calc(-1 * var(--ul-indent-size));
  height: var(--line-height);
}

ol > li {
  padding-left: var(--ol-li-padding-left);
}

ol                         { list-style-type: decimal; }
ol ol                      { list-style-type: lower-alpha; }
ol ol ol                   { list-style-type: lower-roman; }
ol ol ol ol                { list-style-type: decimal; }
ol ol ol ol ol             { list-style-type: lower-alpha; }
ol ol ol ol ol ol          { list-style-type: lower-roman; }
ol ol ol ol ol ol ol       { list-style-type: decimal; }
ol ol ol ol ol ol ol ol    { list-style-type: lower-alpha; }
ol ol ol ol ol ol ol ol ol { list-style-type: lower-roman; }

ul                         { list-style-type: disc; }
ul ul                      { list-style-type: circle; }
ul ul ul                   { list-style-type: square; }
ul ul ul ul                { list-style-type: disc; }
ul ul ul ul ul             { list-style-type: circle; }
ul ul ul ul ul ul          { list-style-type: square; }
ul ul ul ul ul ul ul       { list-style-type: disc; }
ul ul ul ul ul ul ul ul    { list-style-type: circle; }
ul ul ul ul ul ul ul ul ul { list-style-type: square; }

blockquote {
  border-left: 1px solid var(--color-text-secondary);
  padding-left: 1.5rem;

  font-style: italic;
}

blockquote > p {
  margin-top: 0;
}

blockquote em, blockquote i, blockquote .sidenote-wrapper {
  font-style: normal;
}

hr {
  margin-top: var(--hr-margin-top);
  margin-bottom: var(--hr-margin-bottom);
  border-style: solid;
  color: var(--color-border-heavy);
  border-width: 1px 0 0;
}

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

a:hover {
  text-decoration: underline;
}

span.mark, mark {
  /* Reset browser styles */
  color: inherit;

  padding: 2px 0 1px;
}
span.mark.red,    mark.red    { background-color: var(--highlight-red);    }
span.mark.yellow, mark.yellow { background-color: var(--highlight-yellow); }
span.mark.green,  mark.green  { background-color: var(--highlight-green);  }
span.mark.blue,   mark.blue   { background-color: var(--highlight-blue);   }
span.mark.purple, mark.purple { background-color: var(--highlight-purple); }

.subtitle {
  margin-top: 0;
}
.author, .date {
  margin-top: 0;
  margin-bottom: 0;
}
.signoff {
  margin-top: calc(4 * var(--line-height));
  margin-bottom: calc(4 * var(--line-height));
}

/* Pandoc utility classes */
span.smallcaps{ font-variant: small-caps; }
span.underline{ text-decoration: underline; }

.katex-display {
  background: var(--background-color);
  transform: translateZ(0px);
}

@media print {
  .katex-display {
    background-color: initial;
  }
}

/* }}} */
/* ----- Code ---------------------------------------------------------- {{{ */

/* Pandoc code blocks with a language look like div.sourceCode > pre.sourceCode
 * Otherwise, it's just a pre (without .sourceCode)
 *
 * The 'code' element is tricky because it's used for inline code and code in a
 * pre.
 */

code {
  font-family: var(--font-family-code);

  word-spacing: normal;

  /* Only for inline code */
  color: var(--color-inline-code);
  background-color: var(--color-inline-code-bg);
  font-size: var(--inline-code-font-size);
  margin: 0;
  padding: 2px 0 1px;
  border: 1px solid var(--color-border);
  border-radius: 1px;
}

.sidenote code,
.marginnote code {
  font-size: var(--side-note-code-font-size);
}

pre code {
  /* Reset some changes meant to be inline-only */
  color: inherit;
  background-color: inherit;
  font-size: var(--code-block-font-size);
  line-height: var(--line-height);
  margin: initial;
  padding: initial;
  border: initial;
  border-radius: initial;
}

pre > code {
  position: relative; /* For line highlights */
  display: inline-block;
  min-width: 100%;
  z-index: 1;

  white-space: pre-wrap;

  padding: 0 var(--code-block-side-padding);
}

code.sourceCode::selection {
  /* Prevent bug where far right edge of text box shows as selected. */
  background: transparent;
}

.wide > pre, .wide > div.sourceCode {
  /* Put this in front of the table of contents */
  transform: translateZ(0px);
}

.wide pre > code {
  white-space: pre;
}

pre.numberSource code {
  counter-reset: source-line 0;
}

pre > code.sourceCode > span {
  line-height: var(--line-height);

  display: inline-block;
  min-width: 100%;
}

div.sourceCode {
  /* Need to make room for line numbers (even if they're not going to be used).
   * Width doesn't matter, just needs to be big enough to hold the largest line
   * number. */
  --line-numbers-width: calc(4 * var(--line-numbers-font-size));
  --line-numbers-negative-width: calc(-1 * var(--line-numbers-width));
  margin-left: var(--line-numbers-negative-width);
}
div.sourceCode > pre {
  margin-left: var(--line-numbers-width);
}
pre.numberSource > code.sourceCode > span {
  counter-increment: source-line;
  padding-left: var(--line-numbers-width);
  text-indent: var(--line-numbers-negative-width);
  position: relative;
  left: var(--line-numbers-negative-width);
}
pre.numberSource > code.sourceCode > span > a:first-child::before {
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;

  content: counter(source-line);
  font-size: var(--line-numbers-font-size);
  text-decoration: none;

  position: relative;
  text-align: right;
  display: inline-block;

  padding: 0 calc(2 * var(--code-block-side-padding));
  width: var(--line-numbers-width);
}
pre > code.sourceCode > span > a:first-child::before:hover {
  text-decoration: underline;
}

/* Utility class for code blocks that contain things like box drawing characters, where it's nice for things to touch. */
.tight-code pre,
pre.tight-code {
  padding-top: var(--tight-code-padding-top);
}

pre.tight-code code,
.tight-code pre code,
.tight-code pre > code.sourceCode > span,
pre.tight-code > code.sourceCode > span {
  line-height: var(--tight-code-line-height);
}

/* --- Code line highlights --- {{{ */
/* I used some code I contributed to owickstrom's pandoc-emphasize-code[1] as
 * inspiration for these changes.
 *
 * The novel part is using :nth-of-type(...) selectors and CSS classes, instead
 * of needing a pandoc filter. This means that we can stick with pandoc's
 * default syntax highlighter, and not need to requirer JavaScript for syntax
 * highlighting. It has the obvious limitation that it places a fixed limit on
 * lines that can be highlighted, but these additional CSS styles are easy
 * enough to write, so anyone who needs more lines can write their own
 * stylesheet and include it to add more after the fact.
 *
 * [1] https://github.com/owickstrom/pandoc-emphasize-code/pull/3
 */

pre > code.sourceCode > span::after {
  position: absolute;
  background-color: var(--color-code-highlight-bg);
  z-index: -1;
  left: calc(var(--line-numbers-width) - var(--code-block-side-padding));
  right: calc(var(--line-numbers-negative-width) - var(--code-block-side-padding));
  top: 0;
  height: 100%;
}

pre.hl-1  > code.sourceCode > span:nth-of-type(1)::after  { content: ""; }
pre.hl-2  > code.sourceCode > span:nth-of-type(2)::after  { content: ""; }
pre.hl-3  > code.sourceCode > span:nth-of-type(3)::after  { content: ""; }
pre.hl-4  > code.sourceCode > span:nth-of-type(4)::after  { content: ""; }
pre.hl-5  > code.sourceCode > span:nth-of-type(5)::after  { content: ""; }
pre.hl-6  > code.sourceCode > span:nth-of-type(6)::after  { content: ""; }
pre.hl-7  > code.sourceCode > span:nth-of-type(7)::after  { content: ""; }
pre.hl-8  > code.sourceCode > span:nth-of-type(8)::after  { content: ""; }
pre.hl-9  > code.sourceCode > span:nth-of-type(9)::after  { content: ""; }
pre.hl-10 > code.sourceCode > span:nth-of-type(10)::after { content: ""; }
pre.hl-11 > code.sourceCode > span:nth-of-type(11)::after { content: ""; }
pre.hl-12 > code.sourceCode > span:nth-of-type(12)::after { content: ""; }
pre.hl-13 > code.sourceCode > span:nth-of-type(13)::after { content: ""; }
pre.hl-14 > code.sourceCode > span:nth-of-type(14)::after { content: ""; }
pre.hl-15 > code.sourceCode > span:nth-of-type(15)::after { content: ""; }
pre.hl-16 > code.sourceCode > span:nth-of-type(16)::after { content: ""; }
pre.hl-17 > code.sourceCode > span:nth-of-type(17)::after { content: ""; }
pre.hl-18 > code.sourceCode > span:nth-of-type(18)::after { content: ""; }
pre.hl-19 > code.sourceCode > span:nth-of-type(19)::after { content: ""; }
pre.hl-20 > code.sourceCode > span:nth-of-type(20)::after { content: ""; }
pre.hl-21 > code.sourceCode > span:nth-of-type(21)::after { content: ""; }
pre.hl-22 > code.sourceCode > span:nth-of-type(22)::after { content: ""; }
pre.hl-23 > code.sourceCode > span:nth-of-type(23)::after { content: ""; }
pre.hl-24 > code.sourceCode > span:nth-of-type(24)::after { content: ""; }
pre.hl-25 > code.sourceCode > span:nth-of-type(25)::after { content: ""; }
pre.hl-26 > code.sourceCode > span:nth-of-type(26)::after { content: ""; }
pre.hl-27 > code.sourceCode > span:nth-of-type(27)::after { content: ""; }
pre.hl-28 > code.sourceCode > span:nth-of-type(28)::after { content: ""; }
pre.hl-29 > code.sourceCode > span:nth-of-type(29)::after { content: ""; }
pre.hl-30 > code.sourceCode > span:nth-of-type(30)::after { content: ""; }
pre.hl-31 > code.sourceCode > span:nth-of-type(31)::after { content: ""; }
pre.hl-32 > code.sourceCode > span:nth-of-type(32)::after { content: ""; }
pre.hl-33 > code.sourceCode > span:nth-of-type(33)::after { content: ""; }
pre.hl-34 > code.sourceCode > span:nth-of-type(34)::after { content: ""; }
pre.hl-35 > code.sourceCode > span:nth-of-type(35)::after { content: ""; }
pre.hl-36 > code.sourceCode > span:nth-of-type(36)::after { content: ""; }
pre.hl-37 > code.sourceCode > span:nth-of-type(37)::after { content: ""; }
pre.hl-38 > code.sourceCode > span:nth-of-type(38)::after { content: ""; }
pre.hl-39 > code.sourceCode > span:nth-of-type(39)::after { content: ""; }
pre.hl-40 > code.sourceCode > span:nth-of-type(40)::after { content: ""; }

/* }}} */

/* }}} */
/* ----- Images and figures -------------------------------------------- {{{ */

/* There's only a figure if there's a caption. Tighten things up. */
figure {
  margin-bottom: var(--captioned-figure-gap);
}

figure + p {
  margin-top: var(--captioned-figure-gap);
}

figure > img, figure > pre, figure > div.sourceCode {
  margin-bottom: var(--figcaption-gap);
}

img {
  width: 100%;
  display: block;
}

.wide img {
  /* Put this in front of the table of contents */
  transform: translateZ(0px);
}

figcaption {
  font-size: var(--figcaption-font-size);
  line-height: var(--figcaption-line-height);
  font-style: italic;
  text-align: center;
  color: var(--color-text-secondary);
}

.left-align-caption figcaption {
  text-align: left;
}

figcaption code {
  font-size: var(--figcaption-code-font-size);
}

/* }}} */
/* ----- Tables -------------------------------------------------------- {{{ */

table {
  -webkit-font-feature-settings: "tnum" 1;
  font-feature-settings: "tnum" 1;

  font-size: var(--table-font-size);
  line-height: var(--table-line-height);

  border-spacing: 0;
  border-collapse: collapse;
  border: 1px solid var(--color-border-heavy);

  width: 100%;

  /* Solid background to occlude table of contents */
  background-color: var(--background-color);
}

thead, tbody {
  vertical-align: top;
}

td > *:first-child {
  margin-top: 0;
}
td > *:last-child {
  margin-bottom: 0;
}


@media print {
  table {
    background-color: initial;
  }
}

table code {
  font-size: var(--table-code-font-size);
}

table pre code {
  font-size: inherit;
}

.wide table {
  /* Put this in front of the table of contents */
  transform: translateZ(0px);
}

table td, table th {
  border: 1px solid var(--color-border-heavy);
  padding: 5px 8px;
  min-width: 100px;
}
table th {
  background-color: var(--color-table-heading);
}

table > caption {
  caption-side: bottom;
  margin-top: var(--figcaption-gap);
  margin-bottom: calc(var(--captioned-figure-gap) - var(--line-height));
  font-size: var(--figcaption-font-size);
  line-height: var(--figcaption-line-height);
  font-style: italic;
  text-align: center;
  color: var(--color-text-secondary);
}

.left-align-caption table > caption {
  text-align: left;
}

table > caption code {
  font-size: var(--figcaption-code-font-size);
}

/* --- Notes are just single cell tables --- */

.note table {
  font-size: inherit;
  line-height: inherit;
}
.note table, .note td {
  border: none;
}

.note.red    td { background: var(--highlight-red); }
.note.yellow td { background: var(--highlight-yellow); }
.note.green  td { background: var(--highlight-green); }
.note.blue   td { background: var(--highlight-blue); }
.note.purple td { background: var(--highlight-purple); }

/* }}} */
/* ----- Table of contents --------------------------------------------- {{{ */

.date.before-toc {
  padding-bottom: var(--line-height);
}

nav#TOC {
  margin-bottom: var(--line-height);
  border-left: 1px solid var(--color-text-secondary);
  padding-left: 1.5rem;
}

nav#TOC input {
  display: none;
}

nav#TOC label {
  color: var(--color-link);
  cursor: pointer;
}

nav#TOC > ul {
  display: none;
}

nav#TOC > input:checked + ul {
  display: block;
}

@media print {
  nav#TOC > input + ul {
    display: block;
  }
}

/* Unfortunately, variables aren't in scope here.
 * 745px = --main-width
 * 52px = 2 * --line-height
 * 206px = side note min width
 */
@media screen and (min-width: calc(745px + 2 * (52px + 206px + 52px) - 1px)) {
  header {
    margin-bottom: var(--line-height);
  }

  .date.before-toc {
    padding-bottom: initial;
  }

  nav#TOC {
    /* Unset some styles for small screen width */
    margin-bottom: initial;
    border-left: initial;
    padding-left: initial;

    position: sticky;
    margin-top: calc(var(--nav-toc-baseline-offset));
    float: left;
    top: var(--line-height);

    font-size: var(--nav-toc-font-size);
    color: var(--color-text-secondary);

    margin-left: var(--line-height);

    max-width: calc((100vw - var(--main-width)) / 2 - 2 * var(--line-height));
    max-height: calc(100vh - 2 * var(--line-height));
    overflow-y: auto;
  }

  nav#TOC label {
    display: none;
  }

  nav#TOC ul {
    display: block;
    list-style: none;
    margin-left: var(--nav-toc-indent);
  }
  nav#TOC > ul {
    margin-left: 0;
  }

  nav#TOC li {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  nav#TOC code {
    font-size: var(--nav-toc-code-font-size);
  }

  nav#TOC code,
  nav#TOC a,
  nav#TOD a:link,
  nav#TOD a:visited {
    color: var(--color-text-secondary);
  }

  nav#TOC a:hover,
  nav#TOC a:hover code {
    text-decoration: none;
    color: var(--color-link);
  }
}

/* }}} */
/* ----- Horizontal layouting (main, side notes, extra-wide) ----------- {{{ */

.sidenote,
.marginnote {
  float: right;
  clear: right;
  position: relative;

  width: var(--computed-width);
  max-width: var(--side-note-max-width);
  margin-right: calc(-1 * min(var(--computed-width), var(--side-note-max-width)) - var(--margin-left));
}

/* --- Side notes and table of contents always visible --- {{{ */

/* Unfortunately, variables aren't in scope here.
 * 745px = --main-width
 * 52px = 2 * --line-height
 * 206px = side note min width
 */
@media screen and (min-width: calc(745px + 2 * (52px + 206px + 52px))) {
  header,
  main,
  footer {
    max-width: var(--main-width);
  }

  header,
  main,
  footer {
    margin-left: auto;
    margin-right: auto;
  }

  .sidenote,
  .marginnote {
    --margin-left: calc(2 * var(--line-height));
    --margin-right: var(--margin-left);
    --computed-width: calc((100vw - 100%) / 2 - var(--margin-right) - var(--margin-left));
  }

  .wide {
    width: 100%;
    overflow-x: auto;
  }

  .wide.extra-wide {
    margin-left: calc((1 - var(--extra-wide-scale-factor)) / 2 * 100%);
    width: calc(var(--extra-wide-scale-factor) * 100%);
  }

  .wide.full-width {
    margin-left: calc(var(--line-height) - ((100vw - var(--main-width)) / 2));
    width: calc(100vw - 2 * var(--line-height));
  }

  .wide.extra-wide figcaption,
  .wide.extra-wide table > caption {
    margin-left: calc(((var(--extra-wide-scale-factor) - 1) / 2) * var(--main-width));
    max-width: var(--main-width);
    margin-right: calc(100% - var(--main-width) - (((var(--extra-wide-scale-factor) - 1) / 2) * var(--main-width)));
  }

  .wide.full-width figcaption,
  .wide.full-width table > caption {
    margin-left: calc((100vw - var(--main-width)) / 2 - var(--line-height));
    max-width: var(--main-width);
    margin-right: calc(100% - var(--main-width) - ((100vw - var(--main-width)) / 2 - var(--line-height)));
  }
}

/* }}} */
/* --- Side notes visibile, table of contents collapsed, double-wide margins --- {{{ */

/* Unfortunately, variables aren't in scope here.
 * 745px = --main-width
 * 52px = 2 * --line-height
 * 206px = side note min width
 */
@media screen and (min-width: calc(52px + 745px + 52px + 206px + 52px)) and (max-width: calc(745px + 2 * (52px + 206px + 52px) - 1px)) {
  header,
  nav#TOC,
  main,
  footer {
    margin-left: calc(2 * var(--line-height));
    max-width: var(--main-width);
    margin-right: auto;
  }

  .sidenote,
  .marginnote {
    --margin-left: calc(2 * var(--line-height));
    --margin-right: var(--margin-left);
    --computed-width: calc(100vw - var(--main-width) - calc(2 * var(--line-height)) - var(--margin-right) - var(--margin-left));
  }

  .wide {
    width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
  }

  .wide.extra-wide {
    margin-left: calc(-1 * var(--line-height));
    width: calc(100vw - 2 * var(--line-height));
    max-width: calc(var(--extra-wide-scale-factor) * var(--main-width));
  }

  .wide.full-width {
    margin-left: calc(-1 * var(--line-height));
    width: calc(100vw - 2 * var(--line-height));
    max-width: calc(100vw - 2 * var(--line-height));
  }

  .wide.extra-wide .katex-display,
  .wide.full-width .katex-display {
    padding-left: var(--line-height);
    padding-right: var(--line-height);
  }

  .wide.extra-wide .katex-display,
  .wide.extra-wide .katex-display > .katex,
  .wide.full-width .katex-display,
  .wide.full-width .katex-display > .katex {
    text-align: left;
  }

  .wide.extra-wide figcaption,
  .wide.extra-wide table > caption,
  .wide.full-width figcaption,
  .wide.full-width table > caption {
    text-align: left;
    margin-left: var(--line-height);
    max-width: var(--main-width);
  }
}

/* }}} */
/* --- Side notes visibile, table of contents collapsed --- {{{ */

/* Unfortunately, variables aren't in scope here.
 * 550px = --main-width-narrow
 * 26px = --line-height
 * 169px = side note min width narrow
 */
@media screen and (min-width: calc(26px + 550px + 26px + 169px + 26px)) and (max-width: calc(52px + 745px + 52px + 206px + 52px - 1px)) {
  header,
  nav#TOC,
  main,
  footer {
    margin-left: var(--line-height);
    max-width: calc(max(var(--main-width-narrow), 100vw - (3 * var(--line-height)) - var(--side-note-max-width)));
    margin-right: auto;
  }

  .sidenote,
  .marginnote {
    --margin-left: var(--line-height);
    --margin-right: var(--line-height);
    --computed-width: calc(100vw - var(--main-width-narrow) - var(--line-height) - var(--margin-right) - var(--margin-left));
  }

  .wide {
    width: var(--main-width);
    overflow-x: auto;
    overflow-y: hidden;
  }

  .wide .katex-display,
  .wide .katex-display > .katex {
    text-align: left;
  }

  .wide figcaption,
  .wide table > caption {
    text-align: left;
    max-width: var(--main-width-narrow);
  }

  .wide.extra-wide,
  .wide.full-width {
    width: calc(100vw - 2 * var(--line-height));
  }
}

/* }}} */
/* --- Side notes and table of contents collapsed --- {{{ */

/* Unfortunately, variables aren't in scope here.
 * See calculations above.
 */
@media screen and (max-width: calc(26px + 550px + 26px + 169px + 26px - 1px)) {
  header,
  nav#TOC,
  main,
  footer {
    margin-left: var(--line-height);
    margin-right: var(--line-height);
  }

  .sidenote,
  .marginnote {
    display: none;
  }

  .margin-toggle:checked + .sidenote,
  .margin-toggle:checked + .marginnote {
    display: block;
    float: left;
    clear: both;
    width: 100%;
    max-width: 100%;
  }

  .wide {
    width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
  }

  .wide .katex-display,
  .wide .katex-display > .katex {
    text-align: left;
  }

  .wide figcaption,
  .wide table > caption {
    text-align: left;
    max-width: calc(100vw - 2 * var(--line-height));
  }
}

/* }}} */
/* --- Paged media (print styles) --- {{{ */
@page {
  size: letter;
  margin: 0.5in;
  /* To make room for line numbers in left margin. */
  margin-left: 0.25in;
}

@media print {
  :root {
    --line-height: 18px;
    --font-size: 12px;

    --inline-code-font-size: 11px;
    --code-block-font-size: 10px;
    --code-block-side-padding: 6px;
    --line-numbers-font-size: 8.5px;

    --tight-code-line-height: 12.5px;
    --tight-code-padding-top: 2px;

    --side-note-line-height: 14px;
    --side-note-font-size: 9px;
    --side-note-code-font-size: 9px;
    --side-note-baseline-offset: 3px;
    --side-note-sup-offset: -4px;
    --side-note-number-hang-left: -4px;
    --side-note-text-indent: -6.5px;

    --title-font-size: 30px;
    --title-code-font-size: 29px;
    --title-line-height: 37px;
    --title-margin-top: 71px;

    --h1-font-size: 22px;
    --h1-code-font-size: 20px;
    --h1-line-height: 28px;
    --h1-word-spacing: 0.5px;
    --h1-margin-top: 18px;
    --h1-margin-bottom: 6px;

    --h2-font-size: 16.5px;
    --h2-code-font-size: 15px;
    --h2-line-height: 22px;
    --h2-word-spacing: 0px;
    --h2-margin-top: 14px;
    --h2-margin-bottom: 4.5px;

    --ul-indent-size: 18px;
    --ol-indent-size: 14px;

    --hr-margin-top: 14px;

    --figcaption-line-height: 16px;
    --figcaption-font-size: 10px;
    --figcaption-code-font-size: 9.5px;
    --figcaption-gap: 4.5px;
    --captioned-figure-gap: 7.5px;

    --table-line-height: 16px;
    --table-font-size: 10px;
    --table-code-font-size: 9.5px;

    --nav-toc-font-size: 8.5px;
    --nav-toc-code-font-size: 8.5px;
  }

  body {
    padding-top: 0;
    /* To make room for line numbers in left margin. */
    padding-left: 0.25in;
  }

  header,
  nav#TOC,
  main,
  footer {
    width: 5.25in;
    margin-right: auto;
  }

  .sidenote,
  .marginnote {
    width: 2in;
    margin-right: -2.25in;
  }

  .wide {
    width: 7.5in;
    overflow-x: hidden;
    overflow-y: hidden;
  }

  .wide .katex-display,
  .wide .katex-display > .katex {
    text-align: left;
  }

  .wide figcaption,
  .wide table > caption {
    text-align: left;
    width: 5.25in;
  }

  .wide pre > code {
    white-space: pre-wrap;
  }
}

h1, h2, h3 {
  page-break-after: avoid;
}

table, figure, pre, img {
  page-break-inside: avoid;
}
/* }}} */
/* }}} */

/* vim:fdm=marker
 */
