.md-typeset .highlight,
.md-typeset .highlight pre,
.md-typeset .highlight code {
  background-color: #000;
  color: #fff;
}

/* --- Section heading hierarchy -------------------------------------------
 *
 * Goals:
 *   - Every heading level is noticeably larger than its body text.
 *   - Higher-level headings are progressively larger than lower ones.
 *   - H1 is prominent but not oversized.
 *   - Lower-level headings (H4-H6) are bold/italic so they still read as
 *     headings even though their absolute size is smaller.
 *
 * Base body text in .md-typeset is 0.8 rem (~12.8 px).
 * The scale below keeps every heading clearly above that baseline while
 * maintaining a visible step between adjacent levels.
 * ----------------------------------------------------------------------- */

.md-typeset h1 {
  font-size: 2em;          /* ~25.6 px */
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin: 0 0 0.75em;
  color: var(--md-default-fg-color);
}

.md-typeset h2 {
  font-size: 1.7em;        /* ~21.8 px */
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.3;
  margin: 1.4em 0 0.6em;
  border-bottom: 1px solid var(--md-default-fg-color--lightest);
  padding-bottom: 0.3em;
}

.md-typeset h3 {
  font-size: 1.4em;        /* ~17.9 px */
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.35;
  margin: 1.4em 0 0.6em;
  border-bottom: 1px solid var(--md-default-fg-color--lightest);
  padding-bottom: 0.3em;
}

.md-typeset h4 {
  font-size: 1.2em;        /* ~15.4 px */
  font-weight: 700;
  line-height: 1.4;
  margin: 1.2em 0 0.5em;
  border-bottom: 1px solid var(--md-default-fg-color--lightest);
  padding-bottom: 0.3em;
}

.md-typeset h5 {
  font-size: 1.15em;       /* ~14.7 px */
  font-weight: 700;
  font-style: italic;
  text-transform: none;
  line-height: 1.4;
  margin: 1.2em 0 0.4em;
  border-bottom: 1px solid var(--md-default-fg-color--lightest);
  padding-bottom: 0.3em;
}

.md-typeset h6 {
  font-size: 1.1em;        /* ~14.1 px */
  font-weight: 700;
  font-style: italic;
  text-transform: none;
  letter-spacing: 0.01em;
  line-height: 1.4;
  margin: 1.1em 0 0.4em;
  border-bottom: 1px solid var(--md-default-fg-color--lightest);
  padding-bottom: 0.3em;
  color: var(--md-default-fg-color);
}

/* --- Compact table cells --------------------------------------------------
 *
 * MkDocs Material's default table padding is generous.  Tighten it so
 * wide tables (e.g. the automation-profile matrix) render without
 * forcing column headers to word-wrap.
 * ----------------------------------------------------------------------- */

/* First column never wraps — sized to its content. */
.md-typeset table:not([class]) th:first-child,
.md-typeset table:not([class]) td:first-child {
  white-space: nowrap;
}

.md-typeset table:not([class]) th {
  min-width: 0;
}

/* --- Primary nav section collapse fix -----------------------------------------
 *
 * Material's native checkbox-based toggle for nav sections (Reference,
 * Development, Architecture Decisions, etc.) must fully hide children
 * when unchecked.  Without this, the <nav> container retains residual
 * height from padding/grid-rows even when the checkbox is unchecked,
 * causing visible whitespace below collapsed section headings.
 * ----------------------------------------------------------------------- */

/* Fully hide children of unchecked primary nav sections */
.md-sidebar--primary .md-nav__item--nested > .md-nav__toggle:not(:checked) ~ .md-nav {
  display: none;
}

/* --- Leaf-page nav items: section-like behaviour ----------------------------
 *
 * toc-collapse.js converts ALL leaf-page nav items in the primary sidebar
 * into section-like DOM structures so every page gets an expand/collapse
 * chevron.  This applies to both top-level single-page items (Specification,
 * Work Remaining, FAQ) and children within sections (Action CLI, Session
 * Model, ADR-001, etc.).
 *
 *   INACTIVE pages are converted into a checkbox + label + nested-nav
 *   structure identical to Material's sections.  The page's TOC is
 *   lazy-loaded into the nested nav on first expand.
 *
 *   ACTIVE pages (the page you're currently viewing) are converted into
 *   an always-expanded, non-collapsible section.  The __toc checkbox and
 *   label are hidden, the <a> is replaced with a non-navigating <label>
 *   matching native section heading structure, and the TOC
 *   (md-nav--secondary) is forced visible.
 * ----------------------------------------------------------------------- */

/* -- Active page item: always-expanded section appearance -----------------
 *
 * toc-collapse.js converts the active page item (at any level in the nav
 * tree) into a non-collapsible section.  The __toc checkbox and label are
 * hidden, the <a> is replaced with a <label> that matches native section
 * heading structure, and the TOC (md-nav--secondary) is forced visible.
 *
 * The marker class .md-nav__item--section-page is added by JS.
 * ----------------------------------------------------------------------- */

/* Force the TOC always visible (JS also sets inline style as fallback) */
.md-nav__item--section-page > .md-nav--secondary {
  display: block !important;
}

/* Rotate the chevron to point downward (expanded state), matching the
 * native rotation rule for checked section toggles. */
.md-nav__item--section-page > .md-nav__link > .md-nav__icon::after {
  transform: rotate(90deg);
}

/* -- Lazy-loaded TOC placeholder -- */

.md-nav__toc-placeholder {
  padding: .4rem .8rem;
  font-size: .64rem;
  opacity: .6;
}

/* --- Collapsible TOC in integrated sidebar --- */

/* Container for the link row: link text + toggle chevron side by side.
 * Scoped to .md-nav--secondary (active page TOC) and .md-nav--page-toc
 * (lazy-loaded TOC in converted single-page nav items) so it does not
 * affect primary nav section headings which use Material's native
 * <label> + checkbox. */
.md-nav--secondary .md-nav__item--nested > .md-nav__link,
.md-nav--page-toc .md-nav__item--nested > .md-nav__link {
  display: flex;
  align-items: center;
}

/* Chevron toggle button injected by JS into TOC sub-items.
 * Styled to match Material's native .md-nav__icon chevron exactly so
 * all expand/collapse indicators look the same across the sidebar. */
.toc-toggle {
  flex-shrink: 0;
  width: .9rem;
  height: .9rem;
  margin-left: auto;
  cursor: pointer;
  border: none;
  background: none;
  border-radius: 100%;
  transition: background-color .25s;
}

.toc-toggle:hover {
  background-color: var(--md-accent-fg-color--transparent);
}

/* Use the same SVG mask-image chevron as Material's .md-nav__icon::after */
.toc-toggle::after {
  content: "";
  display: inline-block;
  width: 100%;
  height: 100%;
  background-color: currentcolor;
  border-radius: 100%;
  -webkit-mask-image: var(--md-nav-icon--next);
  mask-image: var(--md-nav-icon--next);
  -webkit-mask-position: center;
  mask-position: center;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-size: contain;
  mask-size: contain;
  vertical-align: -.1rem;
  transition: transform .25s;
  /* Default: expanded (pointing down) */
  transform: rotate(90deg);
}

/* Rotate arrow to point right when collapsed */
.toc-collapsed > .md-nav__link > .toc-toggle::after {
  transform: rotate(0deg);
}

/* Hide nested nav list when collapsed (TOC items only) */
.md-nav--secondary .md-nav__item--nested.toc-collapsed > .md-nav,
.md-nav--page-toc .md-nav__item--nested.toc-collapsed > .md-nav {
  display: none;
}

/* Show nested nav when expanded (TOC items only) */
.md-nav--secondary .md-nav__item--nested > .md-nav,
.md-nav--page-toc .md-nav__item--nested > .md-nav {
  display: block;
}

/* --- Diagram lightbox (fullscreen on click) --------------------------------
 *
 * Kroki diagrams (<img alt="Kroki">) get a pointer cursor to hint they are
 * clickable.  Clicking one opens a fullscreen overlay with the diagram
 * scaled to fill the viewport.  An X button or the Escape key closes it.
 * ----------------------------------------------------------------------- */

/* Make diagram images look clickable */
img[alt="Kroki"] {
  cursor: zoom-in;
  transition: opacity 0.15s ease;
}

img[alt="Kroki"]:hover {
  opacity: 0.85;
}

/* Fullscreen overlay */
.diagram-lightbox {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.88);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
  padding: 2rem;
}

.diagram-lightbox.active {
  opacity: 1;
  visibility: visible;
}

/* The enlarged diagram image */
.diagram-lightbox img {
  max-width: 95vw;
  max-height: 92vh;
  object-fit: contain;
  border-radius: 4px;
  /* Invert for dark backgrounds so SVG lines stay visible */
  filter: drop-shadow(0 2px 20px rgba(0, 0, 0, 0.5));
  background: #fff;
  padding: 1rem;
}

/* Close button */
.diagram-lightbox-close {
  position: absolute;
  top: 1rem;
  right: 1.5rem;
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 50%;
  color: #fff;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.15s ease;
  z-index: 10000;
}

.diagram-lightbox-close:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: scale(1.1);
}

.diagram-lightbox-close:active {
  transform: scale(0.95);
}

/* ── ADR Admonition ──────────────────────────────────────────────── */

:root {
  --md-admonition-icon--adr: url('data:image/svg+xml;charset=utf-8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M14 2H6c-1.1 0-2 .9-2 2v16c0 1.1.9 2 2 2h12c1.1 0 2-.9 2-2V8l-6-6zm-1 7V3.5L18.5 9H13zM6 20V4h5v7h7v9H6z"/><path d="M8 14h8v2H8zm0-3h8v2H8z"/></svg>');
}

.md-typeset .admonition.adr,
.md-typeset details.adr {
  border-color: #7c4dff;
}

.md-typeset .adr > .admonition-title,
.md-typeset .adr > summary {
  background-color: rgba(124, 77, 255, 0.1);
}

.md-typeset .adr > .admonition-title::before,
.md-typeset .adr > summary::before {
  background-color: #7c4dff;
  -webkit-mask-image: var(--md-admonition-icon--adr);
  mask-image: var(--md-admonition-icon--adr);
}