:root {
  --puredarwin-blue: #0d6efd;
  --puredarwin-header: #000;
  --puredarwin-canvas: #f6f6f6;
  --puredarwin-border: #e3e3e3;
  --sidebar-width: min(var(--sidebar-target-width), 80vw);
  --content-max-width: 900px;
}

.light,
.rust,
.coal,
.navy,
.ayu {
  --bg: var(--puredarwin-canvas);
  --fg: #2f2f2f;
  --sidebar-bg: #fff;
  --sidebar-fg: #4a4a4a;
  --sidebar-non-existant: #aaa;
  --links: var(--puredarwin-blue);
  --sidebar-active: var(--puredarwin-blue);
  --sidebar-spacer: #eee;
  --sidebar-header-border-color: transparent;
  --icons: #fff;
  --icons-hover: #ccc;
  --table-border-color: #ddd;
  --table-header-bg: #eee;
  --table-alternate-bg: #fafafa;
  --color-scheme: light;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
}

html,
body,
.page,
.page-wrapper {
  background: var(--puredarwin-canvas);
}

body::before {
  content: "";
  position: fixed;
  z-index: 100;
  top: 0;
  right: 0;
  left: 0;
  height: 51px;
  background: var(--puredarwin-header);
}

.page-wrapper {
  min-height: 100vh;
}

/* Recreate the old fixed black navigation bar. */
.menu-bar,
.menu-bar-hover-placeholder {
  height: 51px;
}

#mdbook-menu-bar {
  position: fixed !important;
  z-index: 102;
  top: 0;
  right: 0;
  left: 0;
  box-sizing: border-box;
  width: 100vw;
  margin: 0;
  padding: 0 24px;
  background-color: var(--puredarwin-header);
  border-bottom: 1px solid rgba(255, 255, 255, 0.25);
}

#mdbook-menu-bar:hover,
#mdbook-menu-bar.sticky,
html.sidebar-visible #mdbook-menu-bar {
  position: fixed !important;
  top: 0 !important;
}

#mdbook-menu-bar .left-buttons {
  position: absolute;
  left: 12px;
}

#mdbook-menu-bar .right-buttons {
  position: absolute;
  right: 12px;
}

#mdbook-menu-bar .fa-svg,
#mdbook-menu-bar .icon-button {
  padding-right: 5px;
  padding-left: 5px;
}

[dir="rtl"] #mdbook-menu-bar .left-buttons {
  right: 12px;
  left: auto;
}

[dir="rtl"] #mdbook-menu-bar .right-buttons {
  right: auto;
  left: 12px;
}

.menu-bar .left-buttons,
.menu-bar .right-buttons {
  align-items: center;
  height: 50px;
}

.menu-bar .icon-button,
.menu-bar .icon-button:hover,
.menu-bar .icon-button:focus {
  color: #fff;
}

/* The branded theme is deliberately fixed, like the former Docsify site. */
#mdbook-theme-toggle,
#mdbook-theme-list {
  display: none;
}

.menu-title {
  position: absolute;
  top: 7px;
  left: 50%;
  width: 172px;
  height: 36px;
  margin: 0;
  overflow: hidden;
  color: transparent;
  background: url("../img/homepage/logo-mark-text-fff.svg") center / contain
    no-repeat;
  font-size: 0;
  transform: translateX(-50%);
}

a.menu-title {
  cursor: pointer;
  text-decoration: none;
}

a.menu-title:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
}

.sidebar {
  top: 51px;
  background: #fff;
  border-right: 1px solid var(--puredarwin-border);
}

.sidebar-scrollbox {
  padding: 28px 18px 28px 28px;
}

.sidebar .chapter li a {
  border-radius: 4px;
  color: #4a4a4a;
  line-height: 1.5;
}

.sidebar .chapter li a:hover {
  color: var(--puredarwin-blue);
  text-decoration: none;
}

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

.sidebar .chapter li a.active::before {
  color: var(--puredarwin-blue);
}

/* Keep article heading outlines, but suppress the orphaned rule mdBook emits
   when a page has no eligible subsections. */
.sidebar .on-this-page:not(:has(a)) {
  display: none;
}

.sidebar .on-this-page > ol {
  padding-inline-start: 0;
}

/* mdBook inserts empty list levels when a document starts at h3 or deeper. */
.sidebar .on-this-page > ol > ol {
  padding-inline-start: 0;
}

.sidebar .on-this-page {
  margin-inline-start: 4px;
}

/* Keep the Docsify-style sidebar fixed-width and remove mdBook's chapter
   paging controls. Navigation remains available through the sidebar. */
.nav-wide-wrapper,
.nav-wrapper {
  display: none;
}

#mdbook-sidebar-resize-handle .sidebar-resize-indicator {
  opacity: 0;
}

.page-wrapper {
  background: var(--puredarwin-canvas);
}

.content {
  box-sizing: border-box;
  margin-top: 32px;
  margin-bottom: 48px;
  padding: 42px 54px 64px;
  background: #fff;
  border: 1px solid var(--puredarwin-border);
  border-radius: 8px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.05);
}

.content main {
  color: #2f2f2f;
  line-height: 1.65;
}

.content h1,
.content h2,
.content h3,
.content h4 {
  color: #1b1b1b;
  font-weight: 600;
}

.content a.header {
  color: inherit;
}

.content h1 {
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--puredarwin-border);
}

.content a {
  color: var(--puredarwin-blue);
}

.content code {
  border-radius: 4px;
}

.content blockquote {
  border-left-color: var(--puredarwin-blue);
}

@media (max-width: 1080px) {
  .content {
    margin: 24px 20px 40px;
    padding: 34px 38px 50px;
  }
}

@media (max-width: 700px) {
  .menu-bar {
    padding: 0 8px;
  }

  #mdbook-menu-bar .left-buttons {
    left: 4px;
  }

  #mdbook-menu-bar .right-buttons {
    right: 4px;
  }

  .menu-title {
    width: 145px;
  }

  .content {
    margin: 0;
    padding: 28px 22px 44px;
    border: 0;
    border-radius: 0;
    box-shadow: none;
  }
}

@media print {
  body::before {
    display: none;
  }
}

/* Keep alternate mdBook color schemes readable inside the white Docsify card. */
.coal .content main,
.navy .content main,
.ayu .content main,
.rust .content main {
  color: #2f2f2f;
}