/* Technical-manual overrides (generic theme, no project names).
 * Asciidoctor's built-in HTML5 stylesheet remains the foundation;
 * this file only adds sidebar, disclosure, active-state, spacing,
 * scrolling, and responsive rules. No frameworks. */

:root {
  --docs-sidebar-width: 20rem;
  --docs-border: #d7dae0;
  --docs-active-bg: #eef3fa;
  --docs-active-border: #1f4e79;
  --docs-controls-fg: #444;
}

/* Independent scrolling: sidebar and document move separately. */
#toc {
  bottom: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
}

#toc .sectlevel1 {
  padding-bottom: 2rem;
}

/* Collapse/expand controls (buttons are injected by nav.js). */
#toc-controls {
  display: flex;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--docs-border);
  position: sticky;
  top: 0;
  background: inherit;
  z-index: 1;
}

#toc-controls button {
  font-size: 0.72rem;
  color: var(--docs-controls-fg);
  background: transparent;
  border: 1px solid var(--docs-border);
  border-radius: 3px;
  padding: 0.15rem 0.5rem;
  cursor: pointer;
}

#toc-controls button:hover,
#toc-controls button:focus-visible {
  border-color: var(--docs-active-border);
  outline: 2px solid var(--docs-active-border);
  outline-offset: 1px;
}

/* Disclosure rows: arrow button + normal navigation link. */
#toc li {
  position: relative;
  list-style: none;
}

#toc li > .nav-row {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
}

#toc .nav-toggle {
  flex: 0 0 1.4em;
  border: 0;
  background: transparent;
  cursor: pointer;
  color: #555;
  font-size: 0.8em;
  line-height: 1.4;
  padding: 0;
}

#toc .nav-toggle:hover,
#toc .nav-toggle:focus-visible {
  color: #000;
  outline: 2px solid var(--docs-active-border);
  outline-offset: 1px;
}

#toc .nav-toggle .nav-arrow {
  display: inline-block;
  width: 1em;
  text-align: center;
}

/* Leaf entries have no toggle; keep text aligned. */
#toc .nav-spacer {
  flex: 0 0 1.4em;
}

/* Collapsed subtrees. Works with JS; without JS all levels stay open. */
#toc li.nav-collapsed > ul {
  display: none;
}

/* Subtle active-section indication. */
#toc a.toc-active {
  background: var(--docs-active-bg);
  border-left: 3px solid var(--docs-active-border);
  padding-left: calc(0.5em - 3px);
  font-weight: 600;
}

/* Denser but readable engineering tables and code. */
#content table.tableblock {
  font-size: 0.92em;
}

#content .literalblock pre,
#content .listingblock pre {
  font-size: 0.85em;
  line-height: 1.45;
  border: 1px solid var(--docs-border);
}

#content .imageblock {
  margin: 1.25em 0;
}

#content .imageblock img {
  max-width: 100%;
  height: auto;
  background: #fff;
  border: 1px solid var(--docs-border);
  padding: 0.5rem;
}

/* Narrow screens: sidebar stacks above content, nothing clips. */
@media screen and (max-width: 768px) {
  #toc {
    position: static !important;
    width: auto !important;
    max-height: 50vh;
    border-bottom: 2px solid var(--docs-border);
  }

  #content {
    margin-left: 0 !important;
  }

  #content table.tableblock,
  #content .literalblock pre,
  #content .listingblock pre {
    overflow-x: auto;
    display: block;
  }
}

@media print {
  #toc-controls,
  #toc .nav-toggle {
    display: none !important;
  }
}

/* Hero unit at the top of the manual: framed demo, caption, tagline,
 * call-to-action buttons, and meta line in one centered block.
 * Generic: no project names, no hardcoded URLs. */
#content .hero {
  text-align: center;
  margin: 1.5rem auto;
  max-width: 640px;
}

#content .hero img {
  max-width: 100%;
  height: auto;
  background: #fff;
  border: 1px solid var(--docs-border);
  padding: 0.5rem;
}

#content .hero .hero-caption {
  color: #555;
  font-style: italic;
  margin: 0.5rem 0 0;
}

#content .hero .hero-tagline {
  font-size: 1.15em;
  font-weight: 600;
  margin: 0.75rem 0 0;
}

#content .hero .cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  justify-content: center;
  margin: 1rem 0 0.5rem;
}

#content .hero .cta {
  display: inline-block;
  flex: 0 0 auto;
  white-space: nowrap;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none !important;
  padding: 0.55rem 1.25rem;
  border-radius: 4px;
  border: 2px solid var(--docs-active-border);
}

#content .hero .cta-primary {
  background: var(--docs-active-border);
  color: #fff !important;
}

#content .hero .cta-secondary {
  background: transparent;
  color: var(--docs-active-border) !important;
}

#content .hero .cta:hover,
#content .hero .cta:focus-visible {
  outline: 2px solid var(--docs-active-border);
  outline-offset: 2px;
}

#content .hero .hero-meta {
  color: #555;
  margin: 0.5rem 0 0;
}