/* The book, dressed as the rest of krate.tech.
 *
 * mdBook's own themes stay installed; this file re-points the variables of
 * the default (navy) theme at the site's palette -- see docs/landing/site.css,
 * the 2026 shell -- and restyles the chrome the variables do not reach. The
 * book is served at /docs/ on krate.tech, so /fonts/ resolves to the fonts
 * the landing page already ships; a local `mdbook serve` falls back to Inter
 * or the system stack, which is fine for writing.
 */

@font-face {
  font-family: "Geist";
  src: url("/fonts/geist-400.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Geist";
  src: url("/fonts/geist-500.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

/* ------------------------------------------------- the palette, one theme */

html.navy, html.light {
  --bg: #0a0a0a;
  --fg: rgba(255, 255, 255, 0.86);

  --sidebar-bg: #0a0a0a;
  --sidebar-fg: rgba(255, 255, 255, 0.55);
  --sidebar-non-existant: rgba(255, 255, 255, 0.2);
  --sidebar-active: #ffffff;
  --sidebar-spacer: #1f2228;

  --scrollbar: #2e323a;

  --icons: rgba(255, 255, 255, 0.4);
  --icons-hover: #ffffff;

  --links: #a9c2ff;

  --inline-code-color: #e6e6e6;

  --theme-popup-bg: #0f1012;
  --theme-popup-border: #1f2228;
  --theme-hover: rgba(255, 255, 255, 0.06);

  --quote-bg: #0f1012;
  --quote-border: #1f2228;

  --table-border-color: #1f2228;
  --table-header-bg: #0f1012;
  --table-alternate-bg: rgba(255, 255, 255, 0.02);

  --searchbar-border-color: #1f2228;
  --searchbar-bg: #0f1012;
  --searchbar-fg: #ffffff;
  --searchbar-shadow-color: transparent;
  --searchresults-header-fg: rgba(255, 255, 255, 0.55);
  --searchresults-border-color: #1f2228;
  --searchresults-li-bg: #0f1012;
  --search-mark-bg: rgba(98, 145, 255, 0.35);

  --color-scheme: dark;
}

/* --------------------------------------------------------------- typeface */

html.navy body, html.light body,
html.navy .sidebar, html.light .sidebar {
  font-family: "Geist", Inter, ui-sans-serif, system-ui, -apple-system,
    "Segoe UI", sans-serif;
}

html.navy h1, html.navy h2, html.navy h3, html.navy h4 {
  font-weight: 500;
  letter-spacing: -0.02em;
  color: #ffffff;
}

html.navy .content h1 { font-size: 2.1rem; }
html.navy .content h2, html.light .content h2 {
  font-size: 1.4rem;
  margin-top: 2.4em;
  padding-bottom: 0.35em;
  border-bottom: 1px solid #1f2228;
}

html.navy .content { line-height: 1.65; }
html.navy .content p { color: rgba(255, 255, 255, 0.7); }
html.navy .content li { color: rgba(255, 255, 255, 0.7); }

/* ----------------------------------------------------------------- chrome */

/* The top bar: sticky, translucent, hairline -- the same header the rest of
   the site wears. */
html.navy #menu-bar, html.light #menu-bar {
  background: rgba(10, 10, 10, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid #1f2228;
}
html.navy #menu-bar .menu-title, html.light #menu-bar .menu-title {
  font-weight: 500;
  letter-spacing: 0.01em;
  color: #ffffff;
}

/* One brand, one look: the theme picker would undo this file. A stored
   "light" preference from before the toggle was hidden gets the same skin --
   that is what the html.light selectors across this file are for. */
html.navy #theme-toggle, html.light #theme-toggle { display: none; }

/* The sidebar reads like the site's panels: quiet until active. */
html.navy .sidebar, html.light .sidebar {
  font-size: 0.9em;
}
html.navy .chapter li.chapter-item { margin-top: 0.5em; }
html.navy .chapter li a, html.light .chapter li a {
  padding: 2px 0;
  transition: color 0.15s;
}
html.navy .chapter li a:hover, html.light .chapter li a:hover {
  color: #ffffff;
  text-decoration: none;
}
html.navy .chapter li a.active { color: #ffffff; font-weight: 500; }

/* Code: the terminal component's look. */
html.navy pre, html.light pre,
html.navy .content pre > code, html.light .content pre > code {
  background: #0c0d0f !important;
  border-radius: 12px;
}
html.navy .content pre, html.light .content pre {
  border: 1px solid #1f2228;
  padding: 14px 16px;
  font-size: 0.86em;
  line-height: 1.7;
}
html.navy :not(pre) > code, html.light :not(pre) > code {
  background: #0f1012;
  border: 1px solid #1f2228;
  border-radius: 5px;
  padding: 0.1em 0.4em;
  font-size: 0.86em;
}

/* Links in body copy: soft blue, underline on hover only. */
html.navy .content a { color: #a9c2ff; text-decoration: none; }
html.navy .content a:hover { text-decoration: underline; }

/* Search box as a pill. */
html.navy #searchbar, html.light #searchbar {
  border-radius: 999px;
  padding: 8px 16px;
}

/* -------------------------------------------- the "On this page" rail
   Built by krate-theme.js from the page's own h2/h3 on screens wide enough
   to carry a third column, exactly where a reader's eye expects it from
   every modern docs site. Fixed rather than sticky because it is appended
   to <body>, outside mdBook's scroll wrapper. */

.krate-rail {
  position: fixed;
  top: 100px;
  right: 24px;
  width: 210px;
  max-height: calc(100vh - 140px);
  overflow-y: auto;
  font-size: 13px;
  line-height: 1.5;
}
.krate-rail-title {
  color: rgba(255, 255, 255, 0.86);
  font-weight: 500;
  margin-bottom: 10px;
}
.krate-rail-link {
  display: block;
  color: rgba(255, 255, 255, 0.45);
  padding: 3px 0;
  text-decoration: none;
  transition: color 0.15s;
}
.krate-rail-link:hover { color: #ffffff; text-decoration: none; }
.krate-rail-link.active { color: #ffffff; }
.krate-rail-link.sub { padding-left: 14px; }

/* Leave the rail its column. mdBook centres .content with auto margins, so
   only the very wide screens that show the rail need to give ground. */
@media (min-width: 1400px) {
  html.navy .content, html.light .content { margin-right: 270px; }
}

/* ------------------------------------------------- code block header bar
   krate-theme.js labels each fence with its language and moves mdBook's
   copy button into the label bar, so a block reads as a titled card. */

.krate-code-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #0f1012;
  border: 1px solid #1f2228;
  border-bottom: 0;
  border-radius: 12px 12px 0 0;
  padding: 7px 14px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.45);
  font-family: "Geist", Inter, ui-sans-serif, system-ui, sans-serif;
}
.krate-code-head button {
  position: static !important;
  visibility: visible !important;
  background: none;
  border: 0;
  color: rgba(255, 255, 255, 0.4);
  cursor: pointer;
}
.krate-code-head button:hover { color: #ffffff; }
html.navy .content pre.has-head, html.light .content pre.has-head {
  border-radius: 0 0 12px 12px;
  margin-top: 0;
}

/* Print keeps its own rules; nothing here should reach paper. */
@media print {
  html.navy #menu-bar { position: static; background: none; }
  .krate-rail { display: none; }
}