/* ============================================================
   TICKEDOFF COMPONENTS (v3)
   ============================================================
   Loaded after tokens.css. Every component references semantic
   tokens — never raw palette values, never hex codes.
   ============================================================ */

/* ============================================================
   RESET & BASE
   ============================================================ */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  background: var(--color-bg);
}

body {
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  color: var(--color-text);
  background: var(--color-bg) !important;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  background: none;
  border: none;
  color: inherit;
}

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover { color: var(--color-link-hover); }

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

em { font-style: italic; }

/* ============================================================
   LAYOUT SHELL
   ============================================================ */

.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-rows: var(--header-height) 1fr;
  grid-template-areas:
    "header header"
    "sidebar main";
  min-height: 100vh;
  background: var(--color-bg);
}

/* ============================================================
   COMPONENT: HEADER
   ============================================================ */

.site-header {
  grid-area: header;
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: 0 var(--space-5);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: var(--z-header);
}

.hamburger {
  display: none;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  flex-shrink: 0;
}
.hamburger:hover { background: var(--color-surface-raised); color: var(--color-text); }

.search-wrap {
  flex: 1;
  max-width: 540px;
  position: relative;
}

.search-input {
  width: 100%;
  height: 38px;
  padding: 0 var(--space-4) 0 var(--space-7);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: var(--fs-base); /* ≥16px prevents iOS Safari auto-zoom on focus */
  transition: border-color var(--transition-fast), background var(--transition-fast);
}
.search-input::placeholder { color: var(--color-text-muted); }
.search-input:focus {
  outline: none;
  border-color: var(--color-secondary-dim);
  background: var(--color-surface-raised);
}

.search-icon {
  position: absolute;
  left: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  pointer-events: none;
  display: flex;
}

/* ============================================================
   COMPONENT: LOGO
   ============================================================ */

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: var(--fw-semibold);
  font-size: var(--fs-md);
  color: var(--color-text-strong);
  letter-spacing: -0.01em;
  flex-shrink: 0;
  text-decoration: none;
  /* On desktop, fix logo width so search bar left edge aligns with article
     content. Content starts at: sidebar(280) + content-frame-pad(32) = 312px
     from viewport. Search starts at: header-pad(24) + logo-width + gap(16).
     So logo-width = 312 - 24 - 16 = 272px. */
  width: 272px;
}
.logo:hover { color: var(--color-text-strong); }
.logo-mark {
  width: 24px;
  height: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary-dim);
}
.logo-text { display: flex; align-items: baseline; }
.logo-text-accent { color: var(--color-primary-dim); }
.logo-text-tld { color: var(--color-text-muted); font-weight: var(--fw-regular); }

.logo-sm { font-size: var(--fs-sm); }
.logo-sm .logo-mark { width: 18px; height: 18px; }
.logo-sm .logo-mark svg { width: 16px; height: 16px; }

/* ============================================================
   COMPONENT: SIDEBAR / TREE
   ============================================================ */

.sidebar {
  grid-area: sidebar;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  overflow-y: auto;
  padding: var(--space-4) 0 var(--space-6);
  position: sticky;
  top: var(--header-height);
  height: calc(100vh - var(--header-height));
}

.sidebar-section-label {
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-faint);
  padding: var(--space-2) var(--space-5);
  margin-top: var(--space-4);
}
.sidebar-section-label:first-child { margin-top: 0; }

.tree { list-style: none; }
.tree-children { list-style: none; }

.tree-node {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  cursor: pointer;
  user-select: none;
  border-left: 2px solid transparent;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.tree-node:hover {
  background: var(--color-surface-raised);
  color: var(--color-text);
}
.tree-node-active {
  color: var(--color-text-strong);
  background: var(--color-primary-tint);
  border-left-color: var(--color-primary-dim);
  font-weight: var(--fw-medium);
}

.tree-chevron {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  color: var(--color-text-faint);
  transition: transform var(--transition-fast);
}
.tree-node-open > .tree-chevron { transform: rotate(90deg); }
.tree-node-leaf .tree-chevron { visibility: hidden; }

.tree-number {
  font-variant-numeric: tabular-nums;
  color: var(--color-text-faint);
  font-size: var(--fs-xs);
  margin-right: var(--space-1);
  min-width: 3em;
  flex-shrink: 0;
}

.tree-label { flex: 1; }

.tree-children .tree-node { padding-left: calc(var(--space-5) + var(--space-3)); }
.tree-children .tree-children .tree-node { padding-left: calc(var(--space-5) + var(--space-5)); }

.tree-children { display: none; }
.tree-node-open + .tree-children { display: block; }

/* ============================================================
   COMPONENT: MAIN
   ============================================================ */

.main {
  grid-area: main;
  background: var(--color-bg);
}

.content-frame {
  max-width: var(--content-max);
  padding: var(--space-4) var(--space-6) 0;
}

/* ============================================================
   COMPONENT: BREADCRUMB
   ============================================================ */

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--color-text-muted); border-bottom: none; }
.breadcrumb a:hover { color: var(--color-text); }
.breadcrumb-sep { color: var(--color-text-faint); }
.breadcrumb-current { color: var(--color-text); }
.breadcrumb-home { display: inline-flex; align-items: center; }
.breadcrumb-home svg { display: block; }

/* ============================================================
   COMPONENT: PROSE
   ============================================================ */

.prose h1 {
  font-size: var(--fs-2xl);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-tight);
  color: var(--color-text-strong);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-3);
}
.prose h1 .article-title-main {
  display: block;
}
.prose h1 .article-title-sub {
  display: block;
  font-size: var(--fs-lg);
  font-weight: var(--fw-normal);
  color: var(--color-text-muted);
  letter-spacing: 0;
  margin-top: var(--space-2);
}

/* Push anchor-targeted headings below the sticky header */
.prose h2, .prose h3, .prose h4 {
  scroll-margin-top: calc(var(--header-height) + var(--space-4));
}

/* Article table of contents — compact nav box above body content */
.article-toc {
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  margin-bottom: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.article-toc .toc-link {
  color: var(--color-link);
  font-size: var(--fs-sm);
  text-decoration: none;
  border-bottom: none;
  line-height: var(--lh-tight);
  transition: color var(--transition-fast);
}
.article-toc .toc-link:hover {
  color: var(--color-link-hover);
}

.prose .lede {
  font-size: var(--fs-md);
  color: var(--color-text-muted);
  line-height: var(--lh-normal);
  margin-bottom: var(--space-6);
}

.prose h2 {
  font-size: var(--fs-xl);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-snug);
  color: var(--color-text-strong);
  letter-spacing: -0.01em;
  margin: var(--space-7) 0 var(--space-3);
}

.prose h3 {
  font-size: var(--fs-lg);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-snug);
  color: var(--color-text-strong);
  margin: var(--space-6) 0 var(--space-2);
}

.prose p {
  margin-bottom: var(--space-4);
  line-height: var(--lh-loose);
}

.prose ul, .prose ol {
  margin: var(--space-3) 0 var(--space-4) var(--space-5);
  line-height: var(--lh-loose);
}
.prose li { margin-bottom: var(--space-2); }

.prose a:not(.citation):not(.btn):not(.gloss-link):not(.toc-link) {
  color: var(--color-link);
  /* Fallback for iOS Safari < 16.2 (no color-mix support) */
  border-bottom: 1px solid var(--color-link);
  border-bottom: 1px solid color-mix(in srgb, var(--color-link) 45%, transparent);
  transition: color var(--transition-fast), border-color var(--transition-fast);
}
.prose a:not(.citation):not(.btn):not(.gloss-link):not(.toc-link):hover {
  color: var(--color-link-hover);
  border-bottom-color: var(--color-link-hover);
}

/* Source links: ↗ icon signals "external, opens in new tab" without relying on color. */
.prose a.source-link::after {
  content: " ↗";
  font-size: 0.75em;
  vertical-align: super;
  opacity: 0.6;
}

/* ============================================================
   COMPONENT: CITATION
   ============================================================
   Inline prose link using human publication name, not filename.
   ============================================================ */

.citation {
  color: var(--color-link);
  /* Fallback for iOS Safari < 16.2 (no color-mix support) */
  border-bottom: 1px solid var(--color-link);
  border-bottom: 1px solid color-mix(in srgb, var(--color-link) 50%, transparent);
  transition: color var(--transition-fast), border-color var(--transition-fast);
}
.citation:hover {
  color: var(--color-link-hover);
  border-bottom-color: var(--color-link-hover);
}
.citation::after {
  content: " ↗";
  font-size: 0.8em;
  opacity: 0.6;
  margin-left: 0.1em;
}

/* ============================================================
   COMPONENT: BLOCKQUOTE (long verbatim citations in article prose)
   ============================================================
   Emitted by the compiler for quotes too long for inline reading.
   Markdown `> ...` → <blockquote><p>...</p></blockquote>.
   ============================================================ */

.prose blockquote {
  border-left: 3px solid var(--color-primary-dim);
  margin: var(--space-5) 0;
  padding: var(--space-2) var(--space-5);
  color: var(--color-text-muted);
}
.prose blockquote p {
  margin: 0;
  line-height: var(--lh-loose);
}
.prose blockquote a:not(.citation):not(.btn) {
  color: var(--color-text-muted);
  border-bottom-color: var(--color-border-strong);
}
.prose blockquote a:not(.citation):not(.btn):hover {
  color: var(--color-link-hover);
  border-bottom-color: var(--color-link-hover);
}

/* ============================================================
   COMPONENT: PULL QUOTE (the one serif moment)
   ============================================================ */

.pullquote {
  border-left: 3px solid var(--color-primary-dim);
  padding: var(--space-4) var(--space-5);
  margin: var(--space-5) 0;
  background: var(--color-primary-tint);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}
.pullquote p {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: var(--fs-md);
  color: var(--color-text);
  margin: 0;
  line-height: var(--lh-normal);
}
.pullquote cite {
  display: block;
  margin-top: var(--space-3);
  font-family: var(--font-sans);
  font-style: normal;
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}

/* ============================================================
   COMPONENT: BUTTONS
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0 var(--space-4);
  height: 36px;
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
  text-decoration: none;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-primary-text);
}
.btn-primary:hover { background: var(--color-primary-hover); color: var(--color-primary-text); }

.btn-secondary {
  background: var(--color-secondary);
  color: var(--color-secondary-text);
}
.btn-secondary:hover { background: var(--color-secondary-hover); color: var(--color-secondary-text); }

.btn-muted {
  background: var(--color-muted-bg);
  border-color: var(--color-muted-border);
  color: var(--color-text);
}
.btn-muted:hover {
  background: var(--color-muted-bg-hover);
  color: var(--color-text);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-muted);
}
.btn-ghost:hover { background: var(--color-surface-raised); color: var(--color-text); }

.btn-info {
  background: var(--color-info);
  color: var(--color-info-text);
}
.btn-info:hover { background: var(--color-info-hover); color: var(--color-info-text); }

.btn-warning {
  background: var(--color-warning);
  color: var(--color-warning-text);
}
.btn-warning:hover { background: var(--color-warning-hover); color: var(--color-warning-text); }

.btn-danger {
  background: var(--color-danger);
  color: var(--color-danger-text);
}
.btn-danger:hover { background: var(--color-danger-hover); color: var(--color-danger-text); }

.btn-sm { height: 28px; padding: 0 var(--space-3); font-size: var(--fs-xs); }
.btn-lg { height: 44px; padding: 0 var(--space-5); font-size: var(--fs-base); }

/* ============================================================
   COMPONENT: SECTION INDEX (parent-topic landing)
   ============================================================ */

.section-index-header { margin-bottom: var(--space-6); }
.section-index-eyebrow {
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary-dim);
  margin-bottom: var(--space-2);
}
.section-index-header h1 {
  font-size: var(--fs-2xl);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-tight);
  color: var(--color-text-strong);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-3);
}
.section-index-lede {
  font-size: var(--fs-md);
  color: var(--color-text-muted);
  line-height: var(--lh-normal);
  max-width: 62ch;
}

.section-index-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.topic-card {
  display: block;
  padding: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  transition: border-color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}
.topic-card:hover {
  border-color: var(--color-primary-dim);
  background: var(--color-surface-raised);
  color: var(--color-text);
  transform: translateY(-1px);
}
.topic-card-number {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--color-text-faint);
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
}
.topic-card-title {
  font-size: var(--fs-md);
  font-weight: var(--fw-semibold);
  color: var(--color-text-strong);
  margin-bottom: var(--space-2);
  line-height: var(--lh-snug);
}
.topic-card-summary {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  line-height: var(--lh-normal);
}

/* Disabled / coming-soon variant. Render as <div>, not <a>. */
.topic-card-disabled {
  opacity: 0.5;
  cursor: default;
  pointer-events: none;
}
.topic-card-disabled:hover {
  border-color: var(--color-border);
  background: var(--color-surface);
  transform: none;
}

/* ============================================================
   COMPONENT: CHAT BAR
   ============================================================
   Lives inside the article column, sticky to viewport bottom.
   Same max-width and left-align as the article itself.
   ============================================================ */

.chat-bar {
  position: sticky;
  bottom: 0;
  padding: var(--space-4) 0;
  background: var(--color-bg);
  box-shadow: 0 -8px 16px -8px rgba(0, 0, 0, 0.35);
  margin-top: var(--space-6);
  z-index: 10;
  isolation: isolate;
}

.chat-input-wrap {
  display: flex;
  align-items: flex-end;
  gap: var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-3) var(--space-3) var(--space-4);
  transition: border-color var(--transition-fast);
}
.chat-input-wrap:focus-within { border-color: var(--color-primary-dim); }

.chat-input {
  flex: 1;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: var(--fs-base);
  font-family: inherit;
  resize: none;
  line-height: var(--lh-normal);
  padding: var(--space-1) 0;
}
.chat-input:focus { outline: none; }
.chat-input::placeholder { color: var(--color-text-muted); }

/* ============================================================
   COMPONENT: CHAT CONVERSATION (active state)
   ============================================================
   When the user submits a question, .chat-history appears
   above .chat-input-wrap and grows as messages accumulate.
   All messages left-aligned. Distinguished by background.
   ============================================================ */

.chat-history {
  list-style: none;
  margin: 0 0 var(--space-3);
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  max-height: 40vh;
  overflow-y: auto;
}
.chat-history:empty { display: none; }

/* Minimize/expand toggle — hidden until first turn lands. When the chat-bar
   is in .is-minimized, the chat-history collapses out of the document flow
   so the input bar drops back to viewport bottom; the toggle stays visible
   so the user can re-expand. */
.chat-history-toggle {
  display: block;
  width: 100%;
  margin: 0 0 var(--space-3);
  padding: var(--space-2) var(--space-3);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
  font-family: inherit;
  cursor: pointer;
  text-align: center;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.chat-history-toggle:hover {
  background: var(--color-surface-raised);
  color: var(--color-text);
}
.chat-history-toggle[hidden] { display: none; }

.chat-bar.is-minimized .chat-history { display: none; }

.chat-message {
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  /* Left-aligned, full available width — no iMessage asymmetry */
}

.chat-message-user {
  background: var(--color-surface-raised);
}

.chat-message-assistant {
  background: var(--color-surface);
}

.chat-message-label {
  font-size: var(--fs-xs);
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-2);
}

.chat-message-body {
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  color: var(--color-text);
}
/* Assistant message bodies wrap their content in .prose, which inherits
   the full prose typography (h2, h3, p, ul, ol, citations, pullquotes).
   h1 is forbidden inside chat messages — see SKILL §6.12.3. */
.chat-message-body .prose p:last-child { margin-bottom: 0; }

/* State badges — sit above message body, top-right of message */
.state-badge {
  display: inline-block;
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-3);
  letter-spacing: 0.02em;
}
.state-badge.state-1 {
  background: var(--color-primary-tint);
  color: var(--color-primary-dim);
}
.state-badge.state-2 {
  background: var(--color-secondary-tint);
  color: var(--color-secondary-dim);
}
.state-badge.state-3 {
  background: var(--color-muted-bg);
  color: var(--color-text-muted);
}

/* Gap button — uses .btn .btn-secondary .btn-sm vocabulary.
   .gap-button class is a JS hook only (no styling), preserved from v0
   so the existing chatbot JS continues to wire its click handler. */
.chat-message .btn.gap-button {
  margin-top: var(--space-3);
}

/* Loading state — pulsing dots while waiting for the API */
.chat-loading {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4);
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
}
.chat-loading::before {
  content: "•••";
  font-size: var(--fs-md);
  letter-spacing: 0.15em;
  animation: chat-loading-pulse 1.4s ease-in-out infinite;
}
@keyframes chat-loading-pulse {
  0%, 80%, 100% { opacity: 0.3; }
  40% { opacity: 1; }
}

/* Error state — uses warning border accent, not full warning bg */
.chat-error {
  padding: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-warning);
  border-radius: var(--radius-md);
}
.chat-error .chat-message-body {
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

/* ============================================================
   COMPONENT: SECTION DIVIDER
   ============================================================ */

.section-divider {
  margin: var(--space-9) 0 var(--space-7);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}
.section-divider-label {
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-faint);
  margin-bottom: var(--space-2);
}

/* ============================================================
   COMPONENT: FOOTER
   ============================================================ */

.site-footer {
  margin-top: var(--space-9);
  padding: var(--space-7) 0 var(--space-7);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
}
.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}
.footer-nav {
  display: flex;
  gap: var(--space-5);
  flex-wrap: wrap;
}
.footer-nav a {
  color: var(--color-text-muted);
  border-bottom: none;
}
.footer-nav a:hover { color: var(--color-text); }

.footer-disclaimer {
  font-size: var(--fs-sm);
  color: var(--color-text-faint);
  line-height: var(--lh-normal);
  max-width: 72ch;
  padding: var(--space-4);
  background: var(--color-surface);
  border-left: 2px solid var(--color-warning);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-bottom: var(--space-5);
}
.footer-disclaimer strong {
  color: var(--color-text);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  font-size: var(--fs-xs);
  color: var(--color-text-faint);
  flex-wrap: wrap;
}

/* ============================================================
   PAGEFIND UI OVERRIDES
   ============================================================
   Pagefind UI renders in shadow DOM but respects these custom
   properties. Minimum viable dark-mode fix — full restyling
   deferred to post-sprint backlog B3.
   ============================================================ */

#search {
  --pagefind-ui-text: var(--color-text);
  --pagefind-ui-background: var(--color-surface);
  --pagefind-ui-border: var(--color-border);
  --pagefind-ui-primary: var(--color-primary);
  --pagefind-ui-border-radius: var(--radius-md);
  --pagefind-ui-font: var(--font-sans);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 900px) {
  :root { --sidebar-width: 0px; }

  .app-shell {
    grid-template-columns: 1fr;
    grid-template-areas:
      "header"
      "main";
  }

  .sidebar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    bottom: 0;
    width: 280px;
    transform: translateX(-100%);
    transition: transform var(--transition-base);
    z-index: var(--z-sidebar-mobile);
    height: auto;
  }
  .sidebar-open { transform: translateX(0); }

  .hamburger { display: inline-flex; }

  .logo { width: auto; }

  .content-frame { padding: var(--space-5) var(--space-4) 0; }

  .prose h1, .section-index-header h1 { font-size: var(--fs-xl); }

  body { font-size: 1.0625rem; }
}

@media (max-width: 600px) {
  .logo-text { display: none; }
  .site-header { gap: var(--space-3); padding: 0 var(--space-4); }
}

/* ============================================================
   COMPONENT: ACKNOWLEDGMENT GATE
   ============================================================
   Used by the article gate modal and the in-chat chatbot
   acknowledgment. Minimal chrome — reuses .btn and prose-style
   typography from the global system.
   ============================================================ */

.ack-modal {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  background: rgba(0, 0, 0, 0.7);
}
.ack-modal[hidden] { display: none; }

.ack-panel {
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
  max-width: 560px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
}

.ack-panel-body > * + * { margin-top: var(--space-4); }
.ack-panel-body > :first-child { margin-top: 0; }
.ack-panel-body > :last-child { margin-bottom: 0; }
.ack-panel-body.prose p { margin-bottom: 0; }
.ack-panel-body.prose h2 { margin-top: 0; }

.ack-checkbox-row {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  cursor: pointer;
}
.ack-checkbox-row input[type="checkbox"] {
  margin-top: 0.2rem;
  width: 1rem;
  height: 1rem;
  accent-color: var(--color-primary);
  flex-shrink: 0;
}

.ack-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.ack-footer-line {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
}

.ack-notice {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  margin-top: var(--space-2);
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  text-align: center;
}

.ack-chat-pinned {
  padding: var(--space-4);
  margin-bottom: var(--space-3);
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
}
.ack-chat-pinned.is-collapsed { padding: var(--space-3); }
.ack-chat-pinned.is-collapsed .ack-chat-pinned-body,
.ack-chat-pinned.is-collapsed .ack-checkbox-row,
.ack-chat-pinned.is-collapsed .ack-actions { display: none; }
.ack-chat-pinned-body > * + * { margin-top: var(--space-3); }

.ack-error {
  color: var(--color-warning);
  font-size: var(--fs-sm);
}

/* ============================================================
   COMPONENT: AUDIO PLAYER
   Spec: ops/20260414_-_AudioEng_TickedOff_AudioPlayer_Spec_v6_2.md §10
   ============================================================ */

.audio-player {
  margin: var(--space-5) 0 var(--space-6);
  padding: var(--space-4);
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.audio-player[hidden] { display: none; }

.audio-player__waveform {
  width: 100%;
  height: 56px;
  margin-bottom: var(--space-3);
}

.audio-player__controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
}

.audio-player__btn {
  min-height: 44px;
  min-width: 44px;
}

.audio-player__btn--play { min-width: 72px; }
.audio-player__btn--speed { min-width: 56px; }

.audio-player__time {
  margin-left: auto;
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}

@media (max-width: 540px) {
  .audio-player__controls { gap: var(--space-1); }
  .audio-player__time { margin-left: 0; width: 100%; text-align: right; }
}

/* ============================================================
   COMPONENT: PAGEFIND SEARCH UI OVERRIDES
   ============================================================
   Pagefind's default UI reserves thumbnail space and uses
   browser-default <mark> (yellow). Override for the TickedOff
   design system: no thumb column, ember-copper highlight.
   ============================================================ */

.pagefind-ui__result-thumb { display: none !important; }
.pagefind-ui__result { gap: 0 !important; }

.pagefind-ui mark,
.pagefind-ui__result-excerpt mark,
.pagefind-ui__result-title mark {
  background: color-mix(in srgb, var(--color-warning) 40%, transparent) !important;
  color: var(--color-text) !important;
  padding: 0 2px;
  border-radius: 2px;
}

/* Glossary page */
.glossary { margin-top: var(--space-6); }
.glossary .glossary-term {
  font-weight: 600;
  font-size: 1.1rem;
  margin-top: var(--space-5);
  scroll-margin-top: 80px;
}
.glossary .glossary-term:target { color: var(--color-accent); }
.glossary .glossary-aliases {
  font-weight: 400;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-left: var(--space-2);
}
.glossary .glossary-def {
  margin-left: 0;
  margin-top: var(--space-2);
}
.glossary .glossary-def p { margin-bottom: var(--space-2); }
.glossary .glossary-backlinks {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}
.glossary .glossary-backlinks-label {
  font-weight: 600;
  margin-right: var(--space-1);
}
.glossary .glossary-backlink-pending {
  color: var(--color-text-faint);
  font-style: italic;
}

/* Glossary inline link — softer than a regular prose link so it reads
   as annotation rather than navigation. CSS-only tooltip uses the
   data-definition attribute; a proper tooltip component (with collision
   detection and polish) is a future Design task. */
.prose a.gloss-link {
  position: relative;
  color: var(--color-link);
  border-bottom: 2px dashed var(--color-link);
  text-decoration: none;
  cursor: help;
}
.prose a.gloss-link:hover {
  color: var(--color-link-hover);
  border-bottom-color: var(--color-link-hover);
}

/* Deep-link target flash — when the glossary page links to /articles/<slug>/#gloss-anchor-<id>,
   the first-mention gloss-link briefly glows so the reader can locate the term they clicked
   on. Matches the pagefind mark background for consistency. */
.prose a.gloss-link[id^="gloss-anchor-"] {
  scroll-margin-top: 80px;
  transition: background-color 1.5s ease-out;
  background-color: transparent;
  border-radius: 2px;
  padding: 0 2px;
  margin: 0 -2px;
}
.prose a.gloss-link[id^="gloss-anchor-"]:target {
  background-color: color-mix(in srgb, var(--color-warning) 40%, transparent);
  transition: background-color 0s;
  animation: gloss-target-fade 2.5s ease-out forwards;
}
@keyframes gloss-target-fade {
  0%   { background-color: color-mix(in srgb, var(--color-warning) 40%, transparent); }
  60%  { background-color: color-mix(in srgb, var(--color-warning) 40%, transparent); }
  100% { background-color: transparent; }
}

/* Tooltip: hover-capable devices only. Touch devices (where :hover
   fires on first tap and blocks navigation) get clean tap-through. */
@media (hover: hover) {
  .prose a.gloss-link:hover::after,
  .prose a.gloss-link:focus-visible::after {
    content: attr(data-definition);
    position: absolute;
    bottom: calc(100% + 6px);
    left: 0;
    background: var(--color-surface-raised);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    padding: 8px 12px;
    border-radius: 4px;
    font-size: 0.875rem;
    line-height: 1.4;
    font-weight: 400;
    max-width: 300px;
    width: max-content;
    white-space: normal;
    z-index: 10;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    pointer-events: none;
  }
}

/* ───── Placeholder articles (unpublished slugs reachable via inline link) ───── */
.placeholder-article .placeholder-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.25em 0.7em;
  border-radius: 999px;
  background: var(--color-surface-2, #f4f1ec);
  color: var(--color-text-muted, #6b6557);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  margin-bottom: 1.25rem;
}
.placeholder-article .placeholder-badge svg {
  flex-shrink: 0;
}
.placeholder-article .placeholder-lede {
  font-size: 1.125rem;
  line-height: 1.55;
  color: var(--color-text, #2a2620);
  margin-top: 0.5rem;
  margin-bottom: 1.25rem;
}
.placeholder-article .placeholder-status {
  color: var(--color-text-muted, #6b6557);
  font-style: italic;
  margin-bottom: 2rem;
  padding: 0.75rem 1rem;
  border-left: 3px solid var(--color-border, #d8d2c5);
  background: var(--color-surface-1, #faf8f3);
}
.placeholder-article .placeholder-faq-list {
  list-style: disc;
  padding-left: 1.5em;
  margin-bottom: 2rem;
}
.placeholder-article .placeholder-faq-list li {
  margin-bottom: 0.4em;
  line-height: 1.5;
}
.placeholder-article .placeholder-related-list {
  list-style: none;
  padding-left: 0;
  margin-bottom: 1.5rem;
}
.placeholder-article .placeholder-related-list li {
  margin-bottom: 0.85em;
  line-height: 1.55;
}
.placeholder-article .placeholder-related-rationale {
  color: var(--color-text-muted, #6b6557);
  font-size: 0.9375rem;
}
.placeholder-article .placeholder-parent {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border, #d8d2c5);
  color: var(--color-text-muted, #6b6557);
  font-size: 0.9375rem;
}