/* sphinx-book-theme (via pydata-sphinx-theme) ships <hr> at 25% opacity
   with color:inherit, which resolves to a barely-visible light grey line.
   Force full opacity and the theme's own body-text color variable (which
   already flips correctly between light/dark mode) instead of fighting
   the opacity value. Scoped to article content so sidebar/modal/other
   theme-chrome rules, which use the same bootstrap `hr` selector for
   different purposes, are left alone. */
.bd-article hr {
  opacity: 1;
  border-top-width: 2px;
  border-top-color: var(--pst-color-text-base);
}

/* Top navbar holds only a search button (Ctrl+K) and mobile sidebar-toggle
   buttons; search is already duplicated in the primary sidebar itself (a
   standard pydata-sphinx-theme feature), so nothing is lost on desktop.
   Zeroing the header-height variable, rather than only hiding .bd-header,
   also closes the gap it would otherwise leave above the primary sidebar
   and secondary ("Contents") sidebar, both of which position themselves
   relative to it. Known tradeoff: on narrow/mobile widths this also removes
   the only visible way to open/close the primary sidebar. See AUDIT.md. */
:root {
  --pst-header-height: 0px !important;
}
.bd-header {
  display: none !important;
}

/* The in-article header (GitHub/download/fullscreen/dark-mode buttons) has
   its own copy of the primary-sidebar toggle, meant to matter only at narrow
   widths where the sidebar collapses. With the top navbar gone it was left
   showing at every width and doing nothing there, since this book's primary
   sidebar isn't collapsible in the first place -- our own resizer (custom.js)
   is the only sidebar control now. Hidden outright rather than fixed, since
   there's nothing for it to toggle. See AUDIT.md. */
.sidebar-toggle.primary-toggle {
  display: none !important;
}

/* Draggable divider for the primary sidebar, sitewide (custom.js creates and
   positions this element; the CSS here is static and page-independent). */
#pst-sidebar-resizer {
  position: fixed;
  top: 0;
  bottom: 0;
  width: 6px;
  z-index: 2001;
  cursor: col-resize;
  background: transparent;
}
#pst-sidebar-resizer:hover,
#pst-sidebar-resizer.dragging {
  background: rgba(128, 128, 128, 0.4);
}

/* The theme only hides the primary (left nav) sidebar on print by adding a
   `.noprint` class via JavaScript on page load (sphinx-book-theme.js); its own
   print stylesheet never targets `.bd-sidebar-primary` directly. If that JS
   doesn't run before print -- blocked script, print-preview snapshot taken
   before it settles -- nothing hides the sidebar and it prints. This rule is
   a plain-CSS fallback, independent of that JS, confirmed by curling the
   built site: the server-rendered HTML never carries `noprint` on its own. */
@media print {
  .bd-sidebar-primary {
    display: none !important;
  }
}

/* chap01-chap08 and jupyter_intro each embed a live JupyterLite pane --
   #chapNN-jupyterlite-pane / #jupyter-intro-jupyterlite-pane, injected
   directly in the chapter source (see tools/build_jupyterlite_content.py's
   CELL_PATCHES for the exact markup every one of those chapters ships). Its
   own inline <style> block sets `display: block` unconditionally, and its
   script docks it with `position: fixed; z-index: 2000` beside the sidebar --
   neither is scoped to screen-only, and it's not one of the theme's chrome
   regions (.bd-sidebar-primary etc.) that sphinx-book-theme.js's noprint
   mechanism covers. Left alone, printing one of these chapters prints a
   full-height fixed box on top of the article text. `!important` is required
   here since the pane's own rule has none and an id selector otherwise beats
   this attribute selector on specificity. */
@media print {
  [id$="-jupyterlite-pane"] {
    display: none !important;
  }
}