/* Brand tokens track site/src/styles/global.css; keep them in step. */
:root {
  --x2c-paper: #f4f1ec;
  --x2c-dark: #171717;
  --x2c-red: #da291c;
  --x2c-red-text: #c82217;
  --x2c-coral: #ff715a;
  --x2c-code: #101011;
  --x2c-muted-dark: #514c47;
  --x2c-muted-light: #a8a29b;
  --serif-font: "Instrument Serif", Georgia, "Times New Roman", serif;
  --sans-font: Archivo, Helvetica, Arial, sans-serif;
  --mono-font: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace;
  --code-font-size: 0.86em;
  --menu-bar-height: 68px;
  --content-max-width: 720px;
  --page-padding: 24px;
}

/* Light: the landing page palette. */
.light {
  --bg: var(--x2c-paper);
  --fg: var(--x2c-dark);
  --hairline: rgba(23, 23, 23, 0.16);
  --sidebar-bg: #ece8e1;
  --sidebar-fg: #3a3632;
  --sidebar-non-existant: #8f8983;
  --sidebar-active: var(--x2c-red-text);
  --sidebar-spacer: rgba(23, 23, 23, 0.14);
  --scrollbar: #a8a29b;
  --icons: var(--x2c-muted-dark);
  --icons-hover: var(--x2c-dark);
  --links: var(--x2c-red-text);
  --inline-code-color: #9e1f16;
  --inline-code-bg: rgba(218, 41, 28, 0.07);
  --inline-code-border: rgba(218, 41, 28, 0.24);
  --theme-popup-bg: #fff;
  --theme-popup-border: var(--hairline);
  --theme-hover: var(--x2c-paper);
  --quote-bg: #ece8e1;
  --quote-border: var(--x2c-red);
  --table-border-color: rgba(23, 23, 23, 0.14);
  --table-header-bg: #fff;
  --table-alternate-bg: transparent;
  --table-bg: #faf8f5;
  --searchbar-border-color: var(--x2c-dark);
  --searchbar-bg: #fff;
  --searchbar-fg: var(--x2c-dark);
  --searchbar-shadow-color: transparent;
  --searchresults-header-fg: var(--x2c-muted-dark);
  --searchresults-border-color: var(--hairline);
  --searchresults-li-bg: #fff;
  --search-mark-bg: #f5b1a5;
  --header-bg: rgba(244, 241, 236, 0.92);
  --nav-muted: #6b655f;
  --color-scheme: light;
  --copy-button-filter: invert(30%) sepia(8%) saturate(400%) brightness(95%);
  --copy-button-filter-hover: invert(80%);
}

/* Dark: the landing page's terminal window, extended to the whole page. */
.ayu {
  --bg: var(--x2c-dark);
  --fg: var(--x2c-paper);
  --hairline: rgba(244, 241, 236, 0.18);
  --sidebar-bg: #1d1d1e;
  --sidebar-fg: #d6d1cb;
  --sidebar-non-existant: #77726d;
  --sidebar-active: var(--x2c-coral);
  --sidebar-spacer: rgba(244, 241, 236, 0.14);
  --scrollbar: #55524f;
  --icons: var(--x2c-muted-light);
  --icons-hover: var(--x2c-paper);
  --links: var(--x2c-coral);
  --inline-code-color: var(--x2c-coral);
  --inline-code-bg: rgba(255, 113, 90, 0.1);
  --inline-code-border: rgba(255, 113, 90, 0.34);
  --theme-popup-bg: #222223;
  --theme-popup-border: var(--hairline);
  --theme-hover: #2e2e30;
  --quote-bg: #222223;
  --quote-border: var(--x2c-red);
  --table-border-color: rgba(244, 241, 236, 0.16);
  --table-header-bg: #222223;
  --table-alternate-bg: transparent;
  --table-bg: #1c1c1d;
  --searchbar-border-color: var(--x2c-paper);
  --searchbar-bg: #222223;
  --searchbar-fg: var(--x2c-paper);
  --searchbar-shadow-color: transparent;
  --searchresults-header-fg: var(--x2c-muted-light);
  --searchresults-border-color: var(--hairline);
  --searchresults-li-bg: #222223;
  --search-mark-bg: #7a2114;
  --header-bg: rgba(23, 23, 23, 0.92);
  --nav-muted: var(--x2c-muted-light);
  --color-scheme: dark;
}

/* Code blocks are the dark terminal window in both themes. */
.shiki.x2c-code,
.shiki.x2c-code span {
  color: var(--shiki-dark);
  background-color: var(--shiki-dark-bg);
  font-style: var(--shiki-dark-font-style, normal);
  font-weight: var(--shiki-dark-font-weight, normal);
  text-decoration: var(--shiki-dark-text-decoration, none);
}

.content pre,
.content pre > .playground-editor,
.content pre > .hljs {
  background: var(--x2c-code);
  color: var(--x2c-paper);
}

/* The bundled light highlight.js palette is unreadable on the dark window,
   so the light theme borrows the site's shiki colours for hljs tokens. */
.light .hljs-keyword,
.light .hljs-selector-tag,
.light .hljs-built_in,
.light .hljs-type,
.light .hljs-literal {
  color: #f0ada1;
}

.light .hljs-string,
.light .hljs-attr,
.light .hljs-symbol {
  color: #9edfb8;
}

.light .hljs-number {
  color: #a9c9f5;
}

.light .hljs-comment,
.light .hljs-meta {
  color: #8b857f;
}

.light .hljs-title,
.light .hljs-section,
.light .hljs-name,
.light .hljs-variable,
.light .hljs-params {
  color: var(--x2c-paper);
}

/* Type */
body {
  font-family: var(--sans-font);
  -webkit-font-smoothing: antialiased;
}

.content main {
  line-height: 1.6;
  font-size: 17px;
}

.content p,
.content ol,
.content ul {
  line-height: 1.6;
}

.content h1 {
  margin-block: 0.4em 0.6em;
  font: 400 clamp(36px, 4.2vw, 46px)/1.05 var(--serif-font);
  letter-spacing: -0.02em;
}

.content h2,
.content h3,
.content h4 {
  font-family: var(--sans-font);
  letter-spacing: -0.02em;
}

.content h2 {
  margin-block-start: 2.6em;
  padding-block-start: 1em;
  border-block-start: 1px solid var(--hairline);
  font-size: 25px;
  font-weight: 600;
}

.content h3 {
  font-size: 19px;
  font-weight: 600;
}

.content h4 {
  font-size: 17px;
  font-weight: 600;
}

.content a {
  text-decoration: underline;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

.content a:hover {
  color: var(--fg);
}

.content .header:link,
.content .header:visited {
  text-decoration: none;
}

/* Inline code as the site's red chips */
.content :not(pre) > code {
  padding: 0.06em 0.28em;
  border: 1px solid var(--inline-code-border);
  border-radius: 0;
  background: var(--inline-code-bg);
  color: var(--inline-code-color);
  font-size: 0.86em;
  font-weight: 500;
  letter-spacing: -0.015em;
}

.content a > code {
  color: inherit;
}

.content h1 code,
.content h2 code,
.content h3 code {
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  font-size: 0.92em;
  font-weight: 500;
  letter-spacing: -0.03em;
}

.content pre {
  padding: 18px 20px;
  border-radius: 0;
  line-height: 1.5;
}

.content pre > code {
  font-size: var(--code-font-size);
}

/* Tables in the feature-table style */
table {
  width: 100%;
  border: 1px solid var(--table-border-color);
  border-top: 3px solid var(--x2c-red);
  border-collapse: collapse;
  background: var(--table-bg);
  font-size: 0.92em;
}

table thead {
  background: var(--table-header-bg);
}

table thead th {
  padding: 10px 14px;
  border: 0;
  border-bottom: 1px solid var(--table-border-color);
  color: var(--nav-muted);
  font: 500 11px/1.2 var(--mono-font);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-align: left;
}

table td {
  padding: 10px 14px;
  border: 0;
  border-bottom: 1px solid var(--table-border-color);
  vertical-align: top;
}

table tbody tr:last-child td {
  border-bottom: 0;
}

blockquote {
  margin: 1.4em 0;
  padding: 0.6em 1.2em;
  border-radius: 0;
  border: 0;
  border-inline-start: 3px solid var(--quote-border);
  background: var(--quote-bg);
}

hr {
  border: 0;
  border-top: 1px solid var(--hairline);
}

/* Header: the landing page header, spanning sidebar and page. */
.x2c-header {
  position: fixed;
  z-index: 200;
  inset-inline: 0;
  top: 0;
  height: var(--menu-bar-height);
  border-top: 4px solid var(--x2c-red);
  border-bottom: 1px solid var(--hairline);
  background: var(--header-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-sizing: border-box;
}

.x2c-header-inner {
  display: flex;
  flex-wrap: wrap;
  height: 100%;
  padding-inline: 18px 28px;
  align-items: center;
  align-content: center;
  gap: 14px;
}

.x2c-header-text {
  display: flex;
  flex: 1;
  min-width: 0;
  align-items: baseline;
  gap: 14px;
}

.x2c-header-tools {
  display: flex;
  align-self: center;
  align-items: center;
  gap: 6px;
}

.x2c-header-tools-right {
  margin-left: 18px;
  position: relative;
}

.x2c-header .icon-button {
  display: inline-flex;
  width: 32px;
  height: 32px;
  margin: 0;
  padding: 0;
  border: 0;
  background: none;
  color: var(--icons);
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.x2c-header .icon-button:hover {
  color: var(--icons-hover);
}

.x2c-header .icon-button .fa-svg {
  width: 17px;
  height: 17px;
  line-height: 1;
}

.x2c-header .x2c-brand {
  position: relative;
  display: inline-block;
  padding-left: 33px;
  color: var(--fg);
  text-decoration: none;
}

.x2c-brand svg {
  position: absolute;
  top: 50%;
  left: 0;
  display: block;
  transform: translateY(-50%);
}

.x2c-wordmark {
  display: inline-block;
  font: 700 0.82em/1 var(--mono-font);
  font-style: normal;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.x2c-brand .x2c-wordmark {
  font-size: 19px;
}

.x2c-section {
  margin-right: auto;
  margin-left: -2px;
  text-align: left;
  cursor: pointer;
  color: var(--nav-muted);
  font: 500 12.5px/1 var(--mono-font);
  letter-spacing: 0.01em;
  text-transform: lowercase;
  white-space: nowrap;
}

.x2c-nav,
.x2c-nav-page,
.x2c-nav-site {
  display: flex;
  align-items: center;
  font: 500 12.5px/1 var(--mono-font);
  letter-spacing: 0.01em;
}

.x2c-nav-page,
.x2c-nav-site {
  gap: clamp(14px, 2.4vw, 30px);
}

.x2c-nav a {
  color: var(--fg);
  text-decoration: none;
}

.x2c-nav-site {
  margin-left: clamp(16px, 2.6vw, 32px);
  padding-left: clamp(16px, 2.6vw, 32px);
  border-left: 1px solid var(--hairline);
}

.x2c-nav-site > a {
  color: var(--nav-muted);
}

.x2c-nav-page > a {
  color: var(--x2c-red);
}

.x2c-nav a:hover {
  color: var(--links);
}

.theme-popup {
  left: auto;
  right: 0;
  top: 44px;
  border-radius: 0;
  font: 500 12px/1 var(--mono-font);
}

.theme-popup .theme {
  padding: 10px 16px;
  font: inherit;
}

@media only screen and (max-width: 1100px) {
  :root {
    --menu-bar-height: 90px;
  }

  .x2c-header-inner {
    flex-wrap: wrap;
    align-content: center;
    gap: 8px 11px;
    padding-inline: 20px;
  }

  .x2c-header-text {
    display: contents;
  }

  .x2c-header-tools-right {
    margin-left: auto;
  }

  .x2c-nav {
    order: 5;
    width: 100%;
    justify-content: space-between;
  }
}

@media only screen and (max-width: 700px) {
  .x2c-nav,
  .x2c-nav-page,
  .x2c-nav-site {
    font-size: 11.5px;
  }

  .x2c-nav-page,
  .x2c-nav-site {
    gap: 14px;
  }

  .x2c-nav-site {
    margin-left: 16px;
    padding-left: 16px;
  }

  .x2c-section {
    display: none;
  }
}

@media only screen and (max-width: 480px) {
  .x2c-nav,
  .x2c-nav-page,
  .x2c-nav-site {
    font-size: 10.5px;
  }

  .x2c-nav-page,
  .x2c-nav-site {
    gap: 10px;
  }

  .x2c-nav-site {
    margin-left: 10px;
    padding-left: 10px;
  }
}

/* Layout under the fixed header */
.sidebar {
  top: var(--menu-bar-height);
  border-right: 1px solid var(--hairline);
}

.page {
  margin-block-start: 0;
  padding-block-start: var(--menu-bar-height);
}

#mdbook-menu-bar-hover-placeholder {
  display: none;
}

#mdbook-search-wrapper {
  margin-top: 8px;
}

.searchbar {
  border-radius: 0;
  font-family: var(--mono-font);
}

/* Sidebar */
.sidebar {
  font-family: var(--sans-font);
  font-size: 14px;
}

.sidebar .sidebar-scrollbox {
  padding: 18px 18px 40px;
}

.chapter li.chapter-item {
  margin-block-start: 0.35em;
  line-height: 1.4;
}

.chapter li.part-title {
  margin-block: 1.6em 0.5em;
  color: var(--nav-muted);
  font: 500 11px/1.2 var(--mono-font);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.chapter li > .chapter-link-wrapper > a:has(> strong),
.chapter li > a:has(> strong) {
  display: grid;
  grid-template-columns: var(--chapter-number-width, 3ch) minmax(0, 1fr);
  column-gap: 8px;
  align-items: baseline;
}

.chapter li > .chapter-link-wrapper > a > strong,
.chapter li > a > strong {
  margin-right: 0;
  text-align: left;
  color: var(--nav-muted);
  font: 500 11.5px/1 var(--mono-font);
  font-variant-numeric: tabular-nums;
}

.chapter li a.active {
  color: var(--sidebar-active);
  font-weight: 600;
}

.chapter li:not(.expanded) > .on-this-page {
  display: none;
}

.chapter .chapter-fold-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  flex: 0 0 28px;
  width: 28px;
  min-width: 28px;
  padding: 4px 0;
  border: 0;
  background: none;
  color: var(--sidebar-fg);
  opacity: 1;
}

.chapter .chapter-fold-toggle div {
  width: 7px;
  height: 7px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  font-size: 0;
  transform: rotate(-45deg);
  transition: transform 120ms ease;
}

.chapter li.expanded > span > .chapter-fold-toggle div {
  transform: rotate(45deg);
}

@media (prefers-reduced-motion: reduce) {
  .chapter .chapter-fold-toggle div {
    transition: none;
  }
}

.chapter a.current-header {
  font-weight: 500;
}

.on-this-page {
  margin-inline-start: 0;
  border-inline-start: 1px solid var(--hairline);
  padding-inline-start: 13px;
}

.on-this-page > ol {
  font-size: 13px;
}

.chapter-item:has(> .chapter-link-wrapper > a > strong) > .on-this-page {
  margin-inline-start: calc(var(--chapter-number-width, 3ch) + 8px);
}

.section {
  padding-inline-start: 14px;
  line-height: 1.5;
}

.chapter .section:has(> li > .chapter-link-wrapper > a > strong),
.chapter .section:has(> li > a > strong) {
  padding-inline-start: 0;
}

.section li {
  margin-block-start: 0.3em;
}

.sidebar-resize-handle {
  background: none;
}

/* Footer pager */
.x2c-pager {
  display: grid;
  max-width: var(--content-max-width);
  margin: 4em auto 2em;
  border-top: 1px solid var(--hairline);
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  padding-top: 20px;
}

.x2c-pager a {
  display: flex;
  flex-direction: column;
  gap: 6px;
  color: var(--fg);
  text-decoration: none;
}

.x2c-pager-next {
  text-align: right;
}

.x2c-pager-label {
  color: var(--nav-muted);
  font: 500 11px/1 var(--mono-font);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.x2c-pager-prev .x2c-pager-label::before {
  content: "\2190\00a0";
}

.x2c-pager-next .x2c-pager-label::after {
  content: "\00a0\2192";
}

.x2c-pager-title {
  font: 400 21px/1.2 var(--serif-font);
  letter-spacing: -0.01em;
}

.x2c-pager a:hover .x2c-pager-title {
  color: var(--links);
}

::selection {
  background: var(--x2c-red-text);
  color: var(--x2c-paper);
}

:focus-visible {
  outline: 2px solid var(--x2c-red);
  outline-offset: 3px;
}