/*
 * Monochrome theme matching rqtk.dev: black background, white text, monospace headings.
 * Registered as an extra theme ("rqtk") on top of mdBook's built-in ones.
 */

.rqtk {
  --bg: #000;
  --fg: #e6e6e6;

  --sidebar-bg: #0a0a0a;
  --sidebar-fg: #bdbdbd;
  --sidebar-non-existant: #555;
  --sidebar-active: #fff;
  --sidebar-spacer: #1e1e1e;

  --scrollbar: #333;

  --icons: #8a8a8a;
  --icons-hover: #fff;

  --links: #fff;

  --inline-code-color: #fff;

  --theme-popup-bg: #0a0a0a;
  --theme-popup-border: #333;
  --theme-hover: #1a1a1a;

  --quote-bg: #0d0d0d;
  --quote-border: #333;

  --warning-border: #8a8a8a;

  --table-border-color: #262626;
  --table-header-bg: #111;
  --table-alternate-bg: #070707;

  --searchbar-border-color: #333;
  --searchbar-bg: #0a0a0a;
  --searchbar-fg: #fff;
  --searchbar-shadow-color: #000;
  --searchresults-header-fg: #8a8a8a;
  --searchresults-border-color: #262626;
  --searchresults-li-bg: #0a0a0a;
  --search-mark-bg: #444;

  --color-scheme: dark;

  --copy-button-filter: invert(80%);
  --copy-button-filter-hover: invert(100%);

  --footnote-highlight: #444;
  --overlay-bg: rgba(0, 0, 0, 0.6);
  --blockquote-note-color: #8a8a8a;
  --blockquote-tip-color: #8a8a8a;
  --blockquote-important-color: #fff;
  --blockquote-warning-color: #fff;
  --blockquote-caution-color: #fff;
  --sidebar-header-border-color: #262626;
}

:root {
  --mono-font: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --code-font-size: 0.875em;
}

.rqtk h1,
.rqtk h2,
.rqtk h3,
.rqtk h4,
.rqtk .menu-title {
  font-family: var(--mono-font);
  font-weight: 600;
  letter-spacing: -0.01em;
}

/* Sidebar hierarchy: parts are small grey labels, pages are links under them, and the
   current page's own headings are smaller still. */
.rqtk .chapter li.part-title {
  font-family: var(--mono-font);
  font-size: 0.72em;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #6f6f6f;
  margin: 1.8em 0 0.5em;
}

.rqtk .chapter li.chapter-item a {
  font-family: var(--mono-font);
  font-weight: 400;
}

.rqtk .chapter li.chapter-item a.active {
  color: #fff;
  font-weight: 600;
}

.rqtk .on-this-page a {
  font-size: 0.9em;
  color: #8a8a8a;
}

.rqtk .on-this-page a.current-header {
  color: #fff;
}

.rqtk .content a {
  text-decoration: underline;
  text-decoration-color: #555;
  text-underline-offset: 0.2em;
}

.rqtk .content a:hover {
  text-decoration-color: #fff;
  text-shadow: 0 0 4px rgba(255, 255, 255, 0.5);
}

.rqtk pre,
.rqtk code {
  background: #0d0d0d;
}

.rqtk pre {
  border: 1px solid #1e1e1e;
}

/* Syntax colours: grey scale, with a single bright tone for emphasis. */
.rqtk .hljs { color: #e6e6e6; background: #0d0d0d; }
.rqtk .hljs-comment, .rqtk .hljs-quote { color: #6f6f6f; font-style: italic; }
.rqtk .hljs-keyword, .rqtk .hljs-selector-tag, .rqtk .hljs-built_in,
.rqtk .hljs-name, .rqtk .hljs-section, .rqtk .hljs-title { color: #fff; font-weight: 600; }
.rqtk .hljs-string, .rqtk .hljs-attr, .rqtk .hljs-attribute,
.rqtk .hljs-literal, .rqtk .hljs-number, .rqtk .hljs-meta { color: #b3b3b3; }