/* Override layer for the Asciidoctor default stylesheet.
   Keep this file small: layout of the collapsible sidebar, disclosure
   controls, active-section state, scroll independence, and minor readable
   adjustments. Everything else comes from Asciidoctor's built-in CSS. */

/* --- Sidebar scroll independence -------------------------------------
   Asciidoctor's toc:left layout already fixes #toc; reaffirm it so the
   sidebar and the document scroll independently of each other. */
#toc.toc2 {
  overflow-y: auto;
  overflow-x: hidden;
}

/* --- Collapse/expand controls ---------------------------------------- */
.toc-controls {
  display: flex;
  gap: 0.5em;
  padding: 0.4em 0 0.6em;
  font-size: 0.8em;
}
.toc-controls button {
  background: none;
  border: 1px solid #d0d0d0;
  border-radius: 3px;
  color: #555;
  cursor: pointer;
  font: inherit;
  padding: 0.15em 0.6em;
}
.toc-controls button:hover {
  background: #f0f0f0;
  color: #111;
}

/* --- Hierarchical collapsible entries ---------------------------------
   Without JS every nested list renders expanded (graceful degradation).
   With JS (.js-nav), collapsed items hide their child list. */
#toc ul {
  list-style: none;
}
#toc .toc-entry {
  display: flex;
  align-items: baseline;
}
#toc a {
  overflow-wrap: anywhere;
}
.js-nav #toc li.collapsed > ul {
  display: none;
}

/* Disclosure arrow: separate control so the title link keeps navigating. */
.toc-toggle {
  background: none;
  border: 0;
  color: #777;
  cursor: pointer;
  flex: 0 0 auto;
  font-size: 0.75em;
  line-height: 1.5;
  padding: 0 0.45em 0 0;
  width: 1.6em;
  text-align: center;
}
.toc-toggle:hover {
  color: #111;
}
.toc-toggle:focus-visible,
.toc-controls button:focus-visible,
#toc a:focus-visible {
  outline: 2px solid #1a73e8;
  outline-offset: 1px;
}

/* --- Active section --------------------------------------------------- */
/* Transparent default border so activating a link never shifts layout. */
#toc ul a {
  border-left: 3px solid transparent;
  padding-left: 0.4em;
}
#toc a.toc-active {
  color: #111;
  font-weight: bold;
  border-left-color: #1a73e8;
}

/* --- Readability adjustments ------------------------------------------ */
#content {
  max-width: 62em;
}
#content .imageblock img {
  max-width: 100%;
  height: auto;
}
/* Dense engineering tables and code blocks scroll instead of overflowing. */
.tableblock table,
.listingblock .content pre {
  max-width: 100%;
}
.tableblock {
  overflow-x: auto;
}
.listingblock .content pre {
  overflow-x: auto;
}

/* --- Narrow screens ----------------------------------------------------
   Desktop is primary. On small viewports the sidebar becomes a normal
   in-flow block above the content so nothing overlaps or clips. */
@media screen and (max-width: 767px) {
  #toc.toc2 {
    position: static !important;
    width: auto !important;
    max-height: 60vh;
    border-bottom: 1px solid #ddd;
    margin-bottom: 1.25em;
  }
}