@import url('https://fonts.googleapis.com/css2?family=Atkinson+Hyperlegible:ital,wght@0,400;0,700;1,400;1,700&display=swap');

:root {
    --sans-serif-font: sans-serif;
    --serif-font: serif;

    --base-font-size: 16px;
    --code-font-size: 1rem;
    --font-scale: 100;
    --spacing-factor: 100;
    --font-family: var(--sans-serif-font);

    --readable-width: 50rem;
    font-size: calc(calc(var(--font-scale) / 100) * var(--base-font-size));

    --text-colour: #000000;
    --link-colour: #0000ee;
    --bg-colour: #ffffff;
    --bg-colour-off: #eeeeee;
    --bg-colour-accent-1: #dcf0dd;
    --bg-colour-accent-2: #F6F6FF;
    --bg-colour-accent-3: #eeffd3;
    --bg-colour-accent-4: #ffeeee;

    --active-link-brightness: 0.6;

    --filter-sepia: 0%;
    --filter-hue-rotate: 0turn;

    --image-filter: none;

    --border: 1px solid var(--text-colour);
}

@media screen {
    html {
        filter: sepia(var(--filter-sepia)) hue-rotate(var(--filter-hue-rotate));
    }
}

body[data-colour-scheme="auto"], body[data-colour-scheme="light"] {
    --text-colour: #000000;
    --link-colour: #0000ee;
    --bg-colour: #ffffff;
    --bg-colour-off: #eeeeee;
    --bg-colour-accent-1: #dcf0dd;
    --bg-colour-accent-2: #F6F6FF;
    --bg-colour-accent-3: #eeffd3;
    --bg-colour-accent-4: #ffeeee;
}

@media (prefers-color-scheme: dark) {
    body[data-colour-scheme="auto"] {
        --text-colour: #ffffff;
        --link-colour: #ccccff;
        --bg-colour: #000000;
        --bg-colour-off: #222222;
        --bg-colour-accent-1: #1e441f;
        --bg-colour-accent-2: #00005d;
        --bg-colour-accent-3: #436d00;
        --bg-colour-accent-4: #550000;

        --active-link-brightness: 1.2;
    }
    body:not([data-colour-scheme="light"])[data-invert-images="true"] #item-content {
        --image-filter: invert(100%) hue-rotate(0.5turn);
    }
}
body[data-colour-scheme="dark"] {
    --text-colour: #ffffff;
    --link-colour: hsl(240, 100%, 81.7%);
    --bg-colour: #000000;
    --bg-colour-off: #222222;
    --bg-colour-accent-1: #1e441f;
    --bg-colour-accent-2: #00005d;
    --bg-colour-accent-3: #436d00;
    --bg-colour-accent-4: #550000;

    --active-link-brightness: 1.2;
}
body[data-colour-scheme="dark"][data-invert-images="true"] {
    --image-filter: invert(100%) hue-rotate(0.5turn);
}

* {
    box-sizing: border-box;
}

body {
    color: var(--text-colour);
    --spacing: calc(1rem * var(--spacing-factor) / 100);
    --line-height: calc(1.25 * var(--spacing-factor) / 100);
    font-family: var(--font-family);
}

body > .skip-to-content-link:not(:focus) {
    left: 50%;
    position: absolute;
    transform: translateY(-1000%);
}

body > #display-options {
    --spacing: 2em;
    font-family: sans-serif;
    font-size: clamp(16px, 3vw, 24px);
    color: black;
    --link-colour: #0000ee;
    background: white;
    padding: var(--spacing);
    border-bottom: 0.2em solid black;
    margin-bottom: var(--spacing);
    max-height: 70vh;
    overflow-y: auto;
}
body > #display-options .inputs {
    display: flex;
    flex-wrap: wrap;
    grid-gap: var(--spacing);
    margin-top: var(--spacing);
}
body > #display-options:not(.show) {
    display: none;
}
body > #display-options label {
    width: 8em;
    text-align: right;
}
body > #display-options .input-group {
    display: flex;
    grid-gap: calc(0.5 * var(--spacing));
    align-items: center;
    flex-wrap: wrap;
}
body > #display-options :is(input, select, textarea) {
    font-size: 1em;
}
body > #display-options output {
    width: 3em;
}

body > #display-options .buttons {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

body:not([data-colour-scheme="custom"]) > #display-options #custom-colour-scheme-options {
    display: none;
}

body {
    background: var(--bg-colour);
    margin: 0;
}

body > :is(main, header, footer) {
    padding: 0 1rem;
}

body > #icon-defs {
    display: none;
}

ul, ol {
    margin-top: var(--spacing);
    margin-bottom: var(--spacing);
}
li ~ li {
    margin-top: var(--spacing);
}

img, svg {
    max-width: 100%;
    filter: var(--image-filter);
}

p {
    margin: 0 0 var(--spacing) 0;
}

h1, h2, h3, h4, h5, h6 {
    margin: calc(3 * var(--spacing)) 0 var(--spacing) 0;
}

button {
    font-size: 1em;
    padding: calc(0.5 * var(--spacing));
}

h1 {
    font-size: 2em;
}

h2 {
    font-size: 1.5em;
}

h3 {
    font-size: 1.3em;
}

h4 {
    font-size: 1.2em;
}
h5 {
    font-size: 1.1em;
}

h6 {
    font-size: 1.05em;
}


hr {
    border: 1px solid var(--text-colour);
    margin: calc(2 * var(--spacing));
}

details {
    background: var(--bg-colour-off);
    padding: var(--spacing);
    border: var(--border);
}

blockquote {
    margin: var(--spacing) 0;
    padding: var(--spacing);
    position: relative;
}

blockquote > p:last-child {
    margin-bottom: 0;
}

:is(p,li,table) code {
    background-color: var(--bg-colour-off);
    color: var(--text-colour);
}

pre {
    font-size: var(--code-font-size);
    overflow: auto hidden;
    padding: var(--spacing);
    border: 1px solid var(--text-colour);
    margin: var(--spacing) 0;
}

.highlight + .output-block {
  border-top: none;
  margin-top: calc(-1 * var(--spacing));
  margin-left: var(--spacing);
  margin-right: var(--spacing);
}

iframe {
    max-width: 100%;
}

.thumbnail {
    margin: var(--spacing) 0;
    box-shadow: 0 0 0.1em 0.1em black;
    max-width: 100%;
}

a {
    color: var(--link-colour);
}
a:active {
    filter: brightness(var(--active-link-brightness));
}


a.undecorated {
    text-decoration: none;
}

svg.icon {
    height: 2em;
}


button.icon-button {
  padding: 0;
  margin: var(--spacing);
  line-height: 1em;
}

body > header {
    margin-bottom: calc(3 * var(--spacing));
    display: grid;
    grid-template: "breadcrumbs display-options" / 1fr auto;
    grid-gap: var(--spacing);
    align-items: center;
    margin-top: var(--spacing);
}

body > header > nav {
    background: linear-gradient(to left, var(--bg-colour), var(--bg-colour-accent-2));
    padding: 0 var(--spacing);
}

body > header > nav #item-pager {
    display: flex;
    gap: var(--spacing) calc(2 * var(--spacing));
    flex-wrap: wrap;
}
body > header > nav #item-pager > a {
    display: inline-block;
}

@media (max-width: 50em) {
    body > header {
        grid-template:
        "breadcrumbs"
        "display-options"
        /
        1fr;
        justify-items: center;
    }
    body > header > nav {
        justify-self: normal;
        background: var(--bg-colour-accent-2);
    }
}

body > header button[aria-controls="display-options"] {
    grid-area: display-options;
}

body > header :is(.author, .year) {
    font-size: 1.3em;
}
body > header .author {
    font-style: italic;
}

body > main {
    display: grid;
    grid-template-columns: [content-start full-start] 1fr [content-end sidebar-start] fit-content(30%) [sidebar-end full-end];
    grid-template-areas: "content sidebar";
    grid-gap: var(--spacing);
    width: 100%;
    line-height: var(--line-height);
}
body > main > #sidebar {
    grid-area: sidebar;
    max-height: 100vh;
    overflow-y: auto;
    position: sticky;
    top: 0;
    background: var(--bg-colour-accent-2);
    padding: var(--spacing);
}

body > main > #sidebar > h1 {
    font-size: 1.3em;
}

body > main > #sidebar .jump-to-item-content {
    display: none;
}

@media (max-width: 55em), print {
    body > main {
        grid-template-columns: [full-start sidebar-start content-start] 1fr [sidebar-end content-end full-end];
        grid-template-areas: "sidebar" "content";
    }
    body > main > #sidebar {
        position: initial;
        background: var(--bg-colour-accent-2);
        margin-bottom: var(--spacing);
        display: grid;
        justify-content: center;
        max-height: none;
    }

    body > main > #sidebar .jump-to-item-content {
        display: inline;
    }
}

@media print {
    body > header {
        margin-bottom: var(--spacing);
    }
    body > main > #sidebar {
        display: none;
    }
}

body.structure > main {
    grid-template:
    "content"
    "structure"
    /
    1fr
    ;
}
body.structure > main > .chirun-structure {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(20em,30em));
    grid-gap: calc(4 * var(--spacing));
    list-style: none;
    padding: 0;
    justify-content: center;
    grid-area: structure;
}
body.structure > main > .chirun-structure > li ~ li {
    margin-top: 0; 
}

body.structure > main > .chirun-structure .item.has-content {
    border: calc(0.2 * var(--spacing)) solid var(--bg-colour-off);
}

body.structure > main > .chirun-structure .item > header {
    background: var(--bg-colour-off);
    padding: 0 var(--spacing);
}

body.structure > main > .chirun-structure .item > header > h2 {
    font-size: 1.5em;
    margin: 0;
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
}
body.structure > main > .chirun-structure .item > header .alternative-formats .icon {
   height: 2rem;
}

body.structure > main > .chirun-structure .contents {
    list-style: none;
    padding-left: var(--spacing);
    padding-right: var(--spacing);
}

body.structure > main > .chirun-structure .contents > li {
    display: flex;
    justify-content: space-between;
    border-bottom: 1px dotted var(--text-colour);
    align-items: center;
    gap: var(--spacing);
}

body.structure > main > .chirun-structure .alternative-formats {
    display: inline-flex;
    grid-gap: var(--spacing);
    list-style: none;
    margin-top: 0;
    margin-bottom: 0;
    flex-shrink: 0;
    padding: 0;
}

body.structure > main > .chirun-structure .alternative-formats li ~ li {
    margin: 0;
}

body > footer {
    display: grid;
    grid-template-columns: [nav-start] auto [nav-end text-start] 1fr [text-end];
    grid-gap: 0 var(--spacing);
    margin-top: calc(5 * var(--spacing));
    font-size: 1rem;
}

@media (max-width: 40rem) {
    body > footer {
        grid-template-columns: [nav-start text-start] 1fr [nav-end text-end];
    }
}

body > footer > hr {
    grid-column: nav / text;
    max-width: 100%;
    margin-left: 0;
    margin-right: 0;
}

body > footer > p {
    grid-column: text;
}

.breadcrumb {
    display: flex;
    grid-gap: var(--spacing);
    list-style: none;
    padding: 0;
    flex-wrap: wrap;
}
.breadcrumb-item {
    margin-top: 0;
}

.breadcrumb-item ~ .breadcrumb-item::before {
    content: '/';
    margin-right: var(--spacing);
}

article.item-content {
    max-width: var(--readable-width);
    justify-self: center;
    overflow-x: auto;
    width: 100%;
}

article.item-content :is(h1, h2, h3, h4, h5, h6) {
    text-decoration: underline;
    text-decoration-thickness: 0.2em;
    text-underline-offset: 0.3em;
    line-height: calc(1.5 * var(--line-height));
}

article.item-content section {
    margin: calc(3 * var(--spacing)) 0;
}


body > main > #sidebar :is(ol,ul) {
    list-style: none;
    padding-left: 0;
}
body > main > #sidebar ol ol {
    padding-left: var(--spacing);
    list-style: disc;
}
body > main > #sidebar > .alternative-formats {
    margin-bottom: calc(2 * var(--spacing));
    margin-top: 0;
}

body > main > #sidebar li ~ li {
    margin-top: var(--spacing);
}

body > main > #sidebar .table-of-contents a {
    display: block;
    border-right: medium solid transparent;
    padding-right: 0.25em;
}

body > main > #sidebar .table-of-contents a.visible {
    border-right-color: var(--text-color);
    background-color: var(--bg-colour-accent-3);
}

body > main > #sidebar .table-of-contents a:not(:hover,:active,:focus) {
    text-decoration: none;
}

body > main > #sidebar .table-of-contents li {
    list-style: none;
}

body > main > #sidebar .table-of-contents a[aria-expanded="true"] .toc-marker::before {
    content: '▼';
}
body > main > #sidebar .table-of-contents a[aria-expanded="false"] .toc-marker::before {
    content: '▶';
}

body > main > #sidebar .table-of-contents .toc-header [role="treeitem"][aria-expanded="false"] + [role="group"] {
    visibility: hidden;
    height: 0;
    overflow: hidden;
    margin: 0;
    padding-bottom: 0;
    padding-top: 0;
}

thead {
    border-bottom: solid var(--text-colour) 1px;
}

table {
    border-top: solid var(--text-colour) 2px;
    border-bottom: solid var(--text-colour) 2px;
}

.exercise, .exercise.primary {
    background-color: var(--bg-colour-accent-1);
}
.interlude, .exercise.secondary {
    background-color: var(--bg-colour-accent-2);
}
.exercise.tertiary {
    background-color: var(--bg-colour-accent-3);
}
.exercise.muted {
    background-color: var(--bg-colour-accent-4);
}

.tcolorbox {
    margin: var(--spacing);
    padding: var(--spacing);
    background-color: var(--bg-colour-off);
    border: 2px solid var(--text-colour);
}
.tcolorbox > header {
    font-weight: bold;
    margin-bottom: var(--spacing);
}

blockquote {
    background-color: var(--bg-colour-off);
    border-left: 0.75em solid var(--text-colour);
}

.beamer-columns {
    display: flex;
    grid-gap: var(--spacing);
}

.tikzpicture {
    width: 100%;
    display: inline;
}

.fbox {
    border: var(--border);
    display: inline-block;
    padding: calc(0.5 * var(--spacing));
}

.minipage {
    display: inline-block;
}

.centered {
    display:block;
    text-align: center;
}

/* Try to match LaTeX table styles */
.tabular {
    display: inline-block;
    width: initial;
    border-top: initial;
    border-bottom: initial;
    line-height: initial;
}

.tabular p {
    margin: 0;
}

table {
    width: 100%;
    max-width: 100%;
    margin: var(--spacing) 0;
    line-height: 2em;
    border-collapse: collapse;
    overflow: auto hidden;
}

td {
    padding: calc(0.5 * var(--spacing)) var(--spacing);
}

.hidden {
    display:none;
}

tr, img {
    page-break-inside: avoid;
}

.vimeo-aspect-ratio iframe {
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0; top: 0;
}

.vimeo-aspect-ratio {
    position: relative;
    width: 100%;
    height: 0;
    padding-bottom: 56.25%;
}

.recap-aspect-ratio iframe {
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0; top: 0;
}

.recap-aspect-ratio {
    position: relative;
    width: 100%;
    height: 0;
    padding-bottom: 56.25%;
}

.youtube-aspect-ratio iframe {
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0; top: 0;
}

.youtube-aspect-ratio {
    position: relative;
    width: 100%;
    height: 0;
    padding-bottom: 56.25%;
}

.oembed > iframe {
    margin: 0 auto;
    display: block;
}

qr-code {
    display: inline-block;
}

.exercise {
    padding: var(--spacing);
    margin: calc(2 * var(--spacing)) 0;
    border: var(--border);
    overflow: auto hidden;
}

details > .collapse-content > .exercise {
    border: none;
    padding: 0;
}

.interlude {
    padding: var(--spacing);
    margin-bottom: calc(2 * var(--spacing));
    border: var(--border);
}

.thin-table {
    text-align: center;
}

.thin-table table {
    max-width: var(--readable-width);
    margin-left: var(--spacing);
}

figure {
    text-align: center;
    margin: var(--spacing) 0;
}
figcaption {
    padding: 0 calc(2 * var(--spacing));
}

figure + em, .reveal figure + em {
    display: inherit;
    text-align: center;
    font-size: 0.8em;
    margin-top: calc(-1 * var(--spacing));
}

.caption_title {
    font-weight: bold;
}
.caption_ref {
    font-weight: bold;
}

.wrapfig {
    max-width: 35%;
}

.ttfamily {
    font-family: monospace;
}

.itemize > li.default-marker {
    list-style-type: none;
}

:is(.bibliography, .itemize, .enumerate) > li > p:first-of-type,
:is(.bibliography, .itemize, .enumerate) > li > .list-item-content > p:first-of-type {
    display: inline;
}

:is(.enumerate,.itemize).custom-terms {
    display: grid;
    list-style: none;
    padding: 0 0 0 var(--spacing);
    grid-template-columns: fit-content(50%) 1fr;
    align-content: start;
    grid-gap: var(--spacing) 0.5em;
}
:is(.enumerate,.itemize).custom-terms > li {
    display: grid;
    grid-template-columns: auto 1fr;
    grid-template-columns: subgrid;
    grid-column: 1/3;
    margin: 0;
    grid-gap: inherit;
}
:is(.enumerate,.itemize).custom-terms .list-item-marker {
    text-align: right;
    align-self: baseline;
}
:is(.enumerate,.itemize).custom-terms .list-item-content {
    align-self: baseline;
}
.itemize.custom-terms .list-item-marker.default-marker::before {
    content: '🞄';
}

@counter-style parenthesized-lower-alpha {
  system: extends lower-alpha;
  prefix: '(';
  suffix: ') ';
}

.enumerate .enumerate {
    list-style: lower-alpha;
    list-style: parenthesized-lower-alpha;
}

.enumerate .enumerate .enumerate {
    list-style: lower-roman;
}

.enumerate .enumerate .enumerate .enumerate {
    list-style: upper-alpha;
}

.bibliography .bibcite {
    display: inline-block;
    margin-right: 0.5em;
}

.item-content :is(.thmcaption, .thmlabel) {
    font-weight: bold;
}

.item-content :is(.proof_caption) {
    font-style: italic;
    font-weight: normal;
}

.subfigure {
    display: inline-block;
}

.revtex-affiliation {
    font-style: italic; 
}

.hspace {
    display: inline-block;
}
.vspace {
    display: block;
}

.vspace.bigskip {
    height: 2em;
}

.vspace.medskip {
    height: 1em;
}

.vspace.smallskip {
    height: 0.5em;
}

footer#footnotes {
    margin-top: calc(4 * var(--spacing));
}

footer#footnotes > ol > li::marker {
    font-size: 0.9em;
}

a.footnote {
    text-decoration: none;
}
a.footnote sup {
    text-decoration: underline;
}


.framed {
    padding: var(--spacing);
    margin: calc(2 * var(--spacing)) 0;
}

.framed-box {
    border: 1px solid var(--text-colour);  
}

.framed-shaded {
    background: var(--bg-colour-accent-1);
}

.framed-leftbar {
    border-left: 0.25em solid var(--text-colour);
    padding: 0 0 0 var(--spacing);
}

.parbox {
    display: inline-block;
}

mjx-container {
    max-width: 100%;
    min-width: auto !important;
    overflow: auto hidden;
    padding: 0.5em 0;
    white-space: pre;
}

u.uuline {
    text-decoration: double underline;
}
u.uwave {
    text-decoration: wavy underline;
}
del.xout {
    opacity: 0.5;
}
u.dashuline {
    text-decoration: dashed underline;
}
u.dotuline {
    text-decoration: dotted underline;
}

.subparagraph {
    text-indent: 2em;
}