/*
 * Forge — AI-native design system
 * ================================
 * Canonical CSS for all blueprint handbook pages.
 *
 * This file is the SINGLE SOURCE OF TRUTH for handbook styling.
 * Built on Bootstrap 5.3 dark mode.
 * Typography: Proxima Nova Black (display), Open Sans (body / labels), Courier New (code).
 *
 * Sections
 * --------
 *  1. Design tokens (CSS custom properties)
 *  2. Base (html, body, backgrounds, selection)
 *  3. Typography (display, mono, labels, gradients)
 *  4. Glassmorphic panels (glass, glass-amber, glass-solid)
 *  5. Sidebar (data-rail navigation)
 *  6. In-page TOC (right rail)
 *  7. Cards (chapter cards, area cards)
 *  8. Bento grid
 *  9. Tables
 * 10. Callouts / alerts
 * 11. Badges
 * 12. Buttons
 * 13. Code blocks & trees
 * 14. Diagram wrapper (Mermaid)
 * 15. Dividers
 * 16. Idle pulse animations
 * 17. Hover breathing (expanding outline)
 * 18. Flow diagram (pure CSS)
 * 19. Stat counters
 * 20. Scrollbar
 * 21. Expandable diagram overlay (modal)
 * 22. Interactive node ↔ detail highlight
 */

@import "forge-light-theme.css";

/* =================================================================
   1. DESIGN TOKENS
   ================================================================= */
:root {
  color-scheme: dark;
  --forge-bg:          #0A0E17;
  --forge-surface:     #111827;
  --forge-surface-2:   #1a2235;
  --forge-border:      rgba(6,182,212,0.12);
  --forge-border-hover:rgba(6,182,212,0.35);
  --forge-amber:       #F59E0B;
  --forge-amber-dim:   rgba(245,158,11,0.15);
  --forge-cyan:        #06B6D4;
  --forge-cyan-dim:    rgba(6,182,212,0.10);
  --forge-orange:      #F97316;
  --forge-emerald:     #10B981;
  --forge-text:        #F1F5F9;
  --forge-text-2:      #94A3B8;
  --forge-text-3:      #708090;
  --forge-text-4:      #4E5D6E;
  --forge-glow-amber:  0 0 20px rgba(245,158,11,0.15), 0 0 3px rgba(245,158,11,0.1);
  --forge-glow-cyan:   0 0 20px rgba(6,182,212,0.15), 0 0 3px rgba(6,182,212,0.1);

  --bs-body-bg:        var(--forge-bg);
  --bs-body-color:     var(--forge-text);
  /* Proxima Nova: add Adobe Fonts kit or @font-face; "Black" may be a separate family name. */
  --bs-body-font-family: "Open Sans", system-ui, -apple-system, sans-serif;
  --bs-body-font-size: 0.9375rem;
  --bs-border-color:   var(--forge-border);

  --font-display: "Proxima Nova Black", "Proxima Nova", "proxima-nova", "Open Sans", system-ui, sans-serif;
  --font-mono:    "Courier New", Courier, monospace;
  --font-label:   "Open Sans", system-ui, sans-serif;
}

/* =================================================================
   2. BASE
   ================================================================= */
html { scroll-behavior: smooth; scroll-padding-top: 4rem; }
body {
  font-family: var(--bs-body-font-family);
  background: var(--forge-bg);
  color: var(--forge-text);
  min-height: 100vh;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image: radial-gradient(circle, rgba(6,182,212,0.08) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}
.forge-aurora {
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 140%;
  height: 600px;
  background: conic-gradient(
    from 180deg at 50% 50%,
    rgba(6,182,212,0.08) 0deg,
    rgba(245,158,11,0.06) 120deg,
    rgba(249,115,22,0.04) 240deg,
    rgba(6,182,212,0.08) 360deg
  );
  filter: blur(80px);
  pointer-events: none;
  z-index: -1;
}
::selection {
  background: rgba(6,182,212,0.3);
  color: #fff;
}
section[id], h2[id], h3[id] { scroll-margin-top: 4rem; }
.doc-content img { max-width: 100%; height: auto; }

/* =================================================================
   3. TYPOGRAPHY
   ================================================================= */
.font-display {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.03em;
}
code, kbd, pre, samp, .doc-mono {
  font-family: var(--font-mono) !important;
  font-size: 0.85em;
}
.font-label {
  font-family: var(--font-label);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.section-label {
  font-family: var(--font-label);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}
a { color: var(--forge-cyan); }
a:hover { color: var(--forge-amber); }
strong { color: var(--forge-text); }

.text-amber  { color: var(--forge-amber) !important; }
.text-cyan   { color: var(--forge-cyan) !important; }
.text-dim    { color: var(--forge-text-2) !important; }
.text-dim-2  { color: var(--forge-text-3) !important; }
.text-muted-4 { color: var(--forge-text-4) !important; }

.forge-support {
  color: var(--forge-text-3);
  font-size: 0.8125rem;
  line-height: 1.5;
}
h1, h2, h3, h4, h5, h6 { color: var(--forge-text); }

.forge-gradient-text {
  background: linear-gradient(135deg, var(--forge-amber) 0%, var(--forge-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Skip link */
.skip-link {
  position: absolute; left: -9999px; z-index: 1080;
  padding: .4rem .85rem; background: var(--forge-amber);
  color: #000; border-radius: 8px; font-weight: 700; text-decoration: none;
}
.skip-link:focus { left: 1rem; top: 1rem; outline: 2px solid var(--forge-amber); outline-offset: 2px; }

/* =================================================================
   4. GLASSMORPHIC PANELS
   ================================================================= */
.glass {
  background: rgba(17,24,39,0.6);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--forge-border);
  border-radius: 12px;
}
.glass:hover {
  border-color: var(--forge-border-hover);
  box-shadow: var(--forge-glow-cyan);
}
.glass-amber {
  background: rgba(17,24,39,0.6);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(245,158,11,0.15);
  border-radius: 12px;
}
.glass-amber:hover {
  border-color: rgba(245,158,11,0.4);
  box-shadow: var(--forge-glow-amber);
}
.glass-solid {
  background: var(--forge-surface);
  border: 1px solid var(--forge-border);
  border-radius: 12px;
}

/* =================================================================
   5. SIDEBAR — AI data-rail navigation
   ================================================================= */
.forge-sidebar {
  background: var(--forge-bg);
  border-right: 1px solid var(--forge-border);
  position: relative;
}
.forge-sidebar::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 3px,
    rgba(6,182,212,0.018) 3px,
    rgba(6,182,212,0.018) 4px
  );
  pointer-events: none;
}
.forge-sidebar .forge-brand {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.05rem;
  letter-spacing: -0.03em;
}
.forge-sidebar .forge-brand .brand-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--forge-amber), rgba(245,158,11,0.6));
  color: var(--forge-bg);
  font-size: 14px;
  font-weight: 900;
  margin-right: 8px;
}
.forge-sidebar .nav-section-label {
  font-family: var(--font-label);
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--forge-text-3);
  padding-left: 1.35rem;
  margin-bottom: 0.15rem;
}
.forge-sidebar .nav-rail {
  position: relative;
  padding-left: 0;
}
.forge-sidebar .nav-rail:not(:has(.doc-sidebar-link))::before {
  content: "";
  position: absolute;
  left: calc(0.6rem + 1px);
  top: 0.5rem;
  bottom: 0.5rem;
  width: 1px;
  background: linear-gradient(
    180deg,
    transparent 0%,
    var(--forge-border) 6%,
    var(--forge-border) 94%,
    transparent 100%
  );
}
.forge-sidebar .nav-link {
  position: relative;
  font-family: var(--bs-body-font-family);
  font-size: 0.8rem;
  color: var(--forge-text-2);
  padding: 0.4rem 0.5rem 0.4rem 1.55rem;
  border-radius: 0;
  border-left: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
  text-decoration: none;
  letter-spacing: 0.01em;
  margin-bottom: 0;
}
.forge-sidebar .nav-link::before {
  content: "";
  position: absolute;
  left: 0.38rem;
  top: 50%;
  transform: translateY(-50%);
  width: 5px;
  height: 5px;
  border-radius: 50%;
  border: 1px solid var(--forge-border);
  background: transparent;
  transition: all 0.2s;
  z-index: 1;
}
.forge-sidebar .nav-link:hover {
  color: var(--forge-text);
  border-left-color: rgba(6,182,212,0.25);
  background: rgba(6,182,212,0.04);
}
.forge-sidebar .nav-link:hover::before {
  border-color: var(--forge-cyan);
  background: rgba(6,182,212,0.4);
  box-shadow: 0 0 6px rgba(6,182,212,0.3);
}
.forge-sidebar .nav-link.active {
  color: var(--forge-cyan);
  border-left-color: var(--forge-cyan);
  background: rgba(6,182,212,0.06);
  font-weight: 500;
}
.forge-sidebar .nav-link.active::before {
  border-color: var(--forge-cyan);
  background: var(--forge-cyan);
  box-shadow: 0 0 8px rgba(6,182,212,0.5);
}
.forge-sidebar .nav-group-toggle {
  position: relative;
  font-family: var(--font-label);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--forge-text-2);
  padding: 0.55rem 0.5rem 0.55rem 1.55rem;
  margin-top: 0.5rem;
  border-left: 2px solid rgba(245,158,11,0.2);
  transition: color 0.2s, border-color 0.2s;
  text-decoration: none;
  border-radius: 0;
}
.forge-sidebar .nav-group-toggle::before {
  content: "";
  position: absolute;
  left: 0.38rem;
  top: 50%;
  transform: translateY(-50%);
  width: 5px;
  height: 5px;
  border-radius: 2px;
  border: 1px solid rgba(245,158,11,0.4);
  background: rgba(245,158,11,0.2);
  z-index: 1;
}
.forge-sidebar .nav-group-toggle:hover {
  color: var(--forge-text);
  border-left-color: rgba(245,158,11,0.4);
}
.forge-sidebar .nav-group-toggle:hover::before {
  border-color: var(--forge-amber);
  background: rgba(245,158,11,0.3);
  box-shadow: 0 0 6px rgba(245,158,11,0.25);
}
.forge-sidebar .nav-group-toggle svg {
  transition: transform 0.2s ease;
  margin-right: 0.35rem;
}
.forge-sidebar .nav-group-toggle:not(.collapsed) svg { transform: rotate(90deg); }

.forge-sidebar .nav-sub-group {
  position: relative;
  margin-left: 1.55rem;
  padding-left: 0;
}
.forge-sidebar .nav-sub-group::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0.4rem;
  width: 1px;
  background: rgba(245,158,11,0.18);
}
.forge-sidebar .nav-sub-link {
  position: relative;
  font-family: var(--bs-body-font-family);
  font-size: 0.74rem;
  color: var(--forge-text-3);
  padding: 0.32rem 0.5rem 0.32rem 1.3rem;
  border-radius: 0;
  border-left: none;
  transition: color 0.2s, background 0.2s;
  text-decoration: none;
  margin-left: 0;
}
.forge-sidebar .nav-sub-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 0.65rem;
  height: 1px;
  background: rgba(245,158,11,0.18);
  transition: background 0.2s;
}
.forge-sidebar .nav-sub-link::after {
  content: "";
  position: absolute;
  left: 0.6rem;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: rgba(245,158,11,0.25);
  transition: all 0.2s;
}
.forge-sidebar .nav-sub-link:hover {
  color: var(--forge-text);
  background: rgba(245,158,11,0.06);
}
.forge-sidebar .nav-sub-link:hover::before {
  background: rgba(245,158,11,0.45);
}
.forge-sidebar .nav-sub-link:hover::after {
  background: rgba(245,158,11,0.6);
  box-shadow: 0 0 5px rgba(245,158,11,0.3);
}
.forge-sidebar .nav-sub-link.active {
  color: var(--forge-amber);
  background: rgba(245,158,11,0.08);
  font-weight: 500;
}
.forge-sidebar .nav-sub-link.active::before {
  background: var(--forge-amber);
}
.forge-sidebar .nav-sub-link.active::after {
  background: var(--forge-amber);
  box-shadow: 0 0 8px rgba(245,158,11,0.5);
}

/* -----------------------------------------------------------------
   5b. SIDEBAR — doc-sidebar-* classes (generated pages)
   ----------------------------------------------------------------- */

/* --- Top-level leaf links ---------------------------------------- */
.forge-sidebar .doc-sidebar-link {
  display: block;
  position: relative;
  font-family: var(--bs-body-font-family);
  font-size: 0.78rem;
  color: var(--forge-text-2);
  padding: 0.4rem 0.6rem 0.4rem 0.75rem;
  border-left: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
  text-decoration: none;
  letter-spacing: 0.01em;
}
.forge-sidebar .doc-sidebar-link:hover {
  color: var(--forge-text);
  border-left-color: rgba(6,182,212,0.3);
  background: rgba(6,182,212,0.04);
}
.forge-sidebar .doc-sidebar-link.active {
  color: var(--forge-cyan);
  border-left-color: var(--forge-cyan);
  background: rgba(6,182,212,0.06);
  font-weight: 500;
}

/* --- Collapsible group wrapper ----------------------------------- */
.forge-sidebar .doc-sidebar-group {
  position: relative;
  margin-top: 0.65rem;
  margin-bottom: 0.2rem;
}
.forge-sidebar .doc-sidebar-nested {
  position: relative;
  margin-top: 0.25rem;
}

/* --- Group header row (chevron + label) -------------------------- */
.forge-sidebar .doc-sidebar-row {
  display: flex;
  align-items: center;
  gap: 0;
  padding: 0.35rem 0.4rem;
  border-radius: 6px;
  background: rgba(245,158,11,0.04);
  border-left: 2px solid rgba(245,158,11,0.25);
}
.forge-sidebar .doc-sidebar-row:hover {
  background: rgba(245,158,11,0.07);
}
.forge-sidebar .doc-sidebar-nested .doc-sidebar-row {
  background: rgba(6,182,212,0.03);
  border-left-color: rgba(6,182,212,0.2);
  margin-left: 0.2rem;
}
.forge-sidebar .doc-sidebar-nested .doc-sidebar-row:hover {
  background: rgba(6,182,212,0.06);
}

.forge-sidebar .doc-sidebar-toggle {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.3rem;
  padding: 0.2rem 0;
  background: none;
  border: none;
  color: var(--forge-amber);
  cursor: pointer;
  transition: color 0.2s;
}
.forge-sidebar .doc-sidebar-nested .doc-sidebar-toggle {
  color: var(--forge-text-3);
}
.forge-sidebar .doc-sidebar-toggle:hover {
  color: var(--forge-text);
}
.forge-sidebar .doc-sidebar-chevron {
  transition: transform 0.2s ease;
}
.forge-sidebar .doc-sidebar-toggle:not(.collapsed) .doc-sidebar-chevron {
  transform: rotate(90deg);
}

/* Full-width group header: chevron + label share one hit target (like clicking the arrow) */
.forge-sidebar .doc-sidebar-toggle--full {
  flex: 1 1 auto;
  width: 100%;
  min-width: 0;
  justify-content: flex-start;
  gap: 0.35rem;
  padding: 0.15rem 0.25rem 0.15rem 0.35rem;
  border-radius: 4px;
  text-align: left;
}
.forge-sidebar .doc-sidebar-toggle--full .doc-sidebar-chevron {
  flex-shrink: 0;
}
.forge-sidebar .doc-sidebar-toggle--full .doc-sidebar-heading--label {
  cursor: pointer;
  flex: 1 1 auto;
  padding: 0.1rem 0;
}

.forge-sidebar .doc-sidebar-heading {
  display: block;
  flex: 1 1 auto;
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--forge-text);
  padding: 0.2rem 0.3rem;
  text-decoration: none;
  transition: color 0.2s;
  cursor: pointer;
}
.forge-sidebar .doc-sidebar-heading:hover {
  color: var(--forge-amber);
}
.forge-sidebar .doc-sidebar-heading.active {
  color: var(--forge-amber);
}
.forge-sidebar .doc-sidebar-heading--label {
  cursor: default;
}

/* --- Children container (indented panel) ------------------------- */
.forge-sidebar .doc-sidebar-children {
  position: relative;
  margin-left: 0.6rem;
  padding: 0.25rem 0 0.25rem 0;
  border-left: 2px solid rgba(245,158,11,0.15);
}
.forge-sidebar .doc-sidebar-nested .doc-sidebar-children {
  border-left-color: rgba(6,182,212,0.12);
  margin-left: 0.8rem;
}

/* --- Sub-level links --------------------------------------------- */
.forge-sidebar .doc-sidebar-sublink {
  display: block;
  position: relative;
  font-family: var(--bs-body-font-family);
  font-size: 0.72rem;
  color: var(--forge-text-3);
  padding: 0.3rem 0.5rem 0.3rem 1rem;
  text-decoration: none;
  transition: color 0.2s, background 0.2s, border-color 0.2s;
  border-left: 2px solid transparent;
  margin-left: -2px;
}
.forge-sidebar .doc-sidebar-sublink:hover {
  color: var(--forge-text);
  background: rgba(245,158,11,0.05);
  border-left-color: rgba(245,158,11,0.4);
}
.forge-sidebar .doc-sidebar-sublink.active {
  color: var(--forge-amber);
  border-left-color: var(--forge-amber);
  background: rgba(245,158,11,0.07);
  font-weight: 500;
}

/* Nested sub-links use cyan accent instead of amber */
.forge-sidebar .doc-sidebar-nested .doc-sidebar-sublink:hover {
  background: rgba(6,182,212,0.04);
  border-left-color: rgba(6,182,212,0.4);
}
.forge-sidebar .doc-sidebar-nested .doc-sidebar-sublink.active {
  color: var(--forge-cyan);
  border-left-color: var(--forge-cyan);
  background: rgba(6,182,212,0.06);
}

/* Sidebar scroll container */
.forge-sidebar .nav-scroll {
  max-height: calc(100vh - 7rem);
  overflow-y: auto;
}

/* =================================================================
   6. IN-PAGE TOC (right rail)
   ================================================================= */
.forge-toc {
  font-size: 0.8rem;
  position: sticky;
  top: 5rem;
  max-height: calc(100vh - 6rem);
  overflow-y: auto;
}
.forge-toc .toc-title {
  font-family: var(--font-label);
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--forge-text-3);
}
.forge-toc .nav-link {
  color: var(--forge-text-3);
  padding: 0.25rem 0 0.25rem 0.75rem;
  border-left: 2px solid transparent;
  font-size: 0.8rem;
  transition: all 0.15s;
}
.forge-toc .nav-link:hover {
  color: var(--forge-text-2);
  border-left-color: var(--forge-border-hover);
}
.forge-toc .nav-link.active {
  color: var(--forge-cyan);
  border-left-color: var(--forge-cyan);
  font-weight: 600;
}

/* =================================================================
   7. CARDS
   ================================================================= */
.forge-card {
  background: var(--forge-surface);
  border: 1px solid var(--forge-border);
  border-radius: 12px;
  padding: 1.25rem;
  transition: all 0.2s ease;
  text-decoration: none;
  color: var(--forge-text);
  display: block;
}
.forge-card:hover { color: var(--forge-text); }
.forge-card .card-label {
  font-family: var(--font-label);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--forge-cyan);
}
.forge-card.card-amber:hover {
  border-color: rgba(245,158,11,0.4);
  box-shadow: var(--forge-glow-amber);
}
.forge-card.card-amber .card-label { color: var(--forge-amber); }

/* Primary title inside catalogue / link cards (above description) */
.forge-card h3,
.forge-card h4,
.forge-card h5 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.12rem, 2.2vw, 1.4rem);
  letter-spacing: -0.025em;
  line-height: 1.2;
  color: var(--forge-text);
}

/* =================================================================
   8. BENTO GRID
   ================================================================= */
.bento-grid { display: grid; gap: 1rem; }
.bento-2 { grid-template-columns: repeat(2, 1fr); }
.bento-3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 767px) {
  .bento-2, .bento-3 { grid-template-columns: 1fr; }
}

/* =================================================================
   9. TABLES
   ================================================================= */
.forge-table-wrap {
  border: 1px solid var(--forge-border);
  border-radius: 12px;
  overflow: hidden;
}
.forge-table-wrap table {
  margin-bottom: 0;
  --bs-table-bg: transparent;
  --bs-table-color: var(--forge-text-2);
  --bs-table-striped-bg: rgba(6,182,212,0.03);
}
.forge-table-wrap thead {
  background: var(--forge-surface);
  border-bottom: 1px solid var(--forge-border);
}
.forge-table-wrap thead th {
  color: var(--forge-text-3);
  font-family: var(--font-label);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
  padding: 0.6rem 0.75rem;
  border: none;
}
.forge-table-wrap tbody td {
  padding: 0.5rem 0.75rem;
  border-color: var(--forge-border);
  font-size: 0.875rem;
}
.forge-table-wrap tbody tr:hover {
  background: var(--forge-cyan-dim) !important;
}

/* =================================================================
   10. CALLOUTS / ALERTS
   ================================================================= */
.forge-callout {
  border-radius: 12px;
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
  outline: 1px solid transparent;
  outline-offset: 0px;
  transition: border-color 0.25s, outline-color 0.25s;
}
.forge-callout:hover {
  outline-style: solid;
  outline-width: 1px;
  animation: breathe-cyan 2.5s ease-in-out infinite;
}
.forge-callout-cyan {
  background: var(--forge-cyan-dim);
  border: 1px solid rgba(6,182,212,0.2);
}
.forge-callout-amber {
  background: var(--forge-amber-dim);
  border: 1px solid rgba(245,158,11,0.2);
}
.forge-callout-emerald {
  background: rgba(16,185,129,0.08);
  border: 1px solid rgba(16,185,129,0.2);
}
.forge-callout-red {
  background: rgba(239,68,68,0.08);
  border: 1px solid rgba(239,68,68,0.2);
}
.forge-callout-surface {
  background: var(--forge-surface);
  border: 1px solid var(--forge-border);
}
.forge-callout .callout-label {
  font-family: var(--font-label);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.35rem;
}

/* In-flow panel that stays visible while scrolling (e.g. showcase toolbars).
   Aligns below .site-header when --site-header-h is set (showcase_page). */
.ks-sticky-panel {
  position: sticky;
  z-index: 25;
  top: calc(var(--site-header-h, 4rem) + 0.35rem);
  margin-bottom: 1rem;
  padding: 1rem 1.25rem;
  border-radius: 14px;
  border: 1px solid color-mix(in srgb, var(--forge-border) 140%, var(--forge-surface-2));
  background: color-mix(in srgb, var(--forge-surface-2) 82%, var(--forge-bg));
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.045),
    0 10px 36px rgba(0, 0, 0, 0.38);
}
html[data-bs-theme="light"] .ks-sticky-panel {
  background: color-mix(in srgb, var(--forge-surface) 90%, #fff);
  border-color: color-mix(in srgb, var(--forge-border) 80%, #cbd5e1);
  box-shadow: 0 8px 28px rgba(15, 23, 42, 0.08);
}

/* =================================================================
   11. BADGES
   ================================================================= */
.forge-badge {
  font-family: var(--font-label);
  font-size: 0.6rem;
  letter-spacing: 0.06em;
  padding: 0.25rem 0.5rem;
  border-radius: 6px;
  font-weight: 600;
}
.badge-cyan {
  background: var(--forge-cyan-dim);
  color: var(--forge-cyan);
  border: 1px solid rgba(6,182,212,0.2);
}
.badge-amber {
  background: var(--forge-amber-dim);
  color: var(--forge-amber);
  border: 1px solid rgba(245,158,11,0.2);
}
.badge-emerald {
  background: rgba(16,185,129,0.1);
  color: var(--forge-emerald);
  border: 1px solid rgba(16,185,129,0.2);
}
.badge-red {
  background: rgba(239,68,68,0.1);
  color: #EF4444;
  border: 1px solid rgba(239,68,68,0.2);
}
.badge-dim {
  background: rgba(100,116,139,0.15);
  color: var(--forge-text-3);
  border: 1px solid rgba(100,116,139,0.15);
}

/* =================================================================
   12. BUTTONS
   ================================================================= */
.btn-forge {
  background: linear-gradient(135deg, var(--forge-amber), var(--forge-orange));
  color: #000;
  font-weight: 700;
  border: none;
  border-radius: 8px;
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
  transition: all 0.2s;
}
.btn-forge:hover {
  box-shadow: var(--forge-glow-amber);
  transform: translateY(-1px);
  color: #000;
}
.btn-forge-outline {
  background: transparent;
  color: var(--forge-amber);
  font-weight: 600;
  border: 1px solid rgba(245,158,11,0.3);
  border-radius: 8px;
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
  transition: all 0.2s;
}
.btn-forge-outline:hover {
  border-color: var(--forge-amber);
  background: var(--forge-amber-dim);
  color: var(--forge-amber);
}
.btn-cyan-outline {
  background: transparent;
  color: var(--forge-cyan);
  font-weight: 600;
  border: 1px solid rgba(6,182,212,0.3);
  border-radius: 8px;
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
  transition: all 0.2s;
}
.btn-cyan-outline:hover {
  border-color: var(--forge-cyan);
  background: var(--forge-cyan-dim);
  color: var(--forge-cyan);
}

/* =================================================================
   12b. TOP CHROME — landing bar, theme menu, showcase header
   ================================================================= */
.landing-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: var(--forge-bg);
  border-bottom: 1px solid var(--forge-border);
  padding: 0.65rem 1.25rem;
}
.landing-header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-start;
  gap: 0.5rem 1.75rem;
  max-width: min(118rem, calc(100vw - 1.5rem));
  margin-left: auto;
  margin-right: auto;
}

/* Lockup: matches product_page sidebar / mobile (.fs-brand in forgesdlc-theme when both load). */
.fs-brand {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--forge-text) !important;
  font-size: 1.05rem;
}
.fs-brand span.fs-accent {
  color: var(--forge-amber);
}
.landing-header .fs-brand:focus-visible {
  outline: 2px solid var(--forge-cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

.landing-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.15rem;
}
.landing-nav a {
  font-family: var(--bs-body-font-family);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--forge-text-2);
  text-decoration: none;
  padding: 0.45rem 0.85rem;
  border-radius: 6px;
  border: 1px solid transparent;
  transition:
    color 0.18s ease,
    background 0.18s ease,
    border-color 0.18s ease,
    box-shadow 0.18s ease;
}
.landing-nav a:hover {
  color: var(--forge-text);
  background: rgba(6, 182, 212, 0.1);
  border-color: rgba(6, 182, 212, 0.35);
  box-shadow: 0 0 0 1px rgba(6, 182, 212, 0.12), var(--forge-glow-cyan);
}
.landing-nav a:focus-visible {
  outline: 2px solid var(--forge-cyan);
  outline-offset: 2px;
}
.landing-nav a.active {
  color: var(--forge-cyan);
  font-weight: 800;
  background: rgba(6, 182, 212, 0.12);
  border-color: rgba(6, 182, 212, 0.45);
  box-shadow: 0 0 12px rgba(6, 182, 212, 0.12);
}

.landing-hero {
  text-align: center;
  padding: 4rem 1.5rem 3rem;
  max-width: 56rem;
  margin: 0 auto;
}

.site-header .site-header-content {
  align-items: flex-start;
  text-align: left;
}
.site-header .breadcrumb {
  --bs-breadcrumb-divider-color: var(--forge-text-4);
  margin-bottom: 0.35rem;
}
.site-header .breadcrumb-item a {
  font-weight: 700;
  color: var(--forge-text-2);
  text-decoration: none;
  transition: color 0.15s ease;
}
.site-header .breadcrumb-item a:hover {
  color: var(--forge-cyan);
}

/* --- Appearance / theme control (glass capsule + menu) ---------------- */
@keyframes forge-theme-aurora {
  0%,
  100% {
    transform: translate(-20%, -30%) rotate(0deg) scale(1);
    opacity: 0.45;
  }
  50% {
    transform: translate(10%, 15%) rotate(180deg) scale(1.12);
    opacity: 0.75;
  }
}

.forge-theme-dropdown .forge-theme-trigger {
  position: relative;
  display: block;
  border: none;
  padding: 0;
  background: transparent;
  border-radius: 9999px;
  color: inherit;
  text-align: left;
  box-shadow: 0 3px 18px rgba(0, 0, 0, 0.32), 0 0 0 1px rgba(6, 182, 212, 0.12);
  transition: box-shadow 0.35s ease, transform 0.35s cubic-bezier(0.34, 1.4, 0.64, 1);
}

.forge-theme-dropdown .forge-theme-trigger::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(
    135deg,
    rgba(245, 158, 11, 0.75),
    rgba(6, 182, 212, 0.55),
    rgba(249, 115, 22, 0.45),
    rgba(245, 158, 11, 0.65)
  );
  background-size: 200% 200%;
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
  animation: forge-theme-border-shift 8s ease infinite;
}

@keyframes forge-theme-border-shift {
  0%,
  100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

.forge-theme-dropdown .forge-theme-trigger__aurora {
  position: absolute;
  inset: -32%;
  border-radius: 50%;
  background: conic-gradient(
    from 200deg,
    rgba(6, 182, 212, 0.25),
    rgba(245, 158, 11, 0.2),
    rgba(249, 115, 22, 0.12),
    rgba(6, 182, 212, 0.22)
  );
  filter: blur(28px);
  opacity: 0.5;
  pointer-events: none;
  z-index: 0;
  animation: forge-theme-aurora 14s ease-in-out infinite;
}

.forge-theme-dropdown .forge-theme-trigger__inner {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.28rem 0.48rem 0.28rem 0.4rem;
  border-radius: inherit;
  background: rgba(17, 24, 39, 0.55);
  backdrop-filter: blur(16px) saturate(1.35);
  -webkit-backdrop-filter: blur(16px) saturate(1.35);
}

.forge-theme-dropdown .forge-theme-trigger:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 26px rgba(0, 0, 0, 0.38), 0 0 0 1px rgba(6, 182, 212, 0.28),
    var(--forge-glow-cyan);
}

.forge-theme-dropdown .forge-theme-trigger:focus-visible {
  outline: 2px solid var(--forge-cyan);
  outline-offset: 3px;
}

.forge-theme-dropdown .forge-theme-trigger.dropdown-toggle::after {
  display: none;
}

.forge-theme-dropdown .forge-theme-trigger__icons {
  position: relative;
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  color: var(--forge-amber);
  filter: drop-shadow(0 0 7px rgba(245, 158, 11, 0.32));
}

.forge-theme-dropdown .forge-theme-ico {
  position: absolute;
  inset: 0;
  transition: opacity 0.4s ease, transform 0.45s cubic-bezier(0.34, 1.45, 0.64, 1);
}

.forge-theme-dropdown[data-forge-pref="light"] .forge-theme-ico--dark,
.forge-theme-dropdown[data-forge-pref="light"] .forge-theme-ico--auto,
.forge-theme-dropdown[data-forge-pref="dark"] .forge-theme-ico--light,
.forge-theme-dropdown[data-forge-pref="dark"] .forge-theme-ico--auto,
.forge-theme-dropdown[data-forge-pref="auto"] .forge-theme-ico--light,
.forge-theme-dropdown[data-forge-pref="auto"] .forge-theme-ico--dark {
  opacity: 0;
  transform: scale(0.5) rotate(-12deg);
  pointer-events: none;
}

.forge-theme-dropdown[data-forge-pref="light"] .forge-theme-ico--light,
.forge-theme-dropdown[data-forge-pref="dark"] .forge-theme-ico--dark,
.forge-theme-dropdown[data-forge-pref="auto"] .forge-theme-ico--auto {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

.forge-theme-dropdown .forge-theme-trigger__copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.1rem;
  min-width: 0;
  padding-right: 0.1rem;
}

.forge-theme-dropdown .forge-theme-eyebrow {
  font-family: var(--font-label);
  font-size: 0.5rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--forge-text-4);
  line-height: 1.35;
}

.forge-theme-dropdown .forge-theme-current {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.8125rem;
  letter-spacing: -0.025em;
  line-height: 1.2;
  background: linear-gradient(120deg, var(--forge-amber) 0%, var(--forge-cyan) 55%, var(--forge-amber) 100%);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: forge-theme-shimmer 6s ease-in-out infinite;
}

@keyframes forge-theme-shimmer {
  0%,
  100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

.forge-theme-dropdown .forge-theme-chevron {
  flex-shrink: 0;
  margin-left: 0.1rem;
  color: var(--forge-text-3);
  opacity: 0.85;
  transition: transform 0.3s ease, color 0.2s ease;
}

.forge-theme-dropdown .forge-theme-trigger[aria-expanded="true"] .forge-theme-chevron {
  transform: rotate(180deg);
  color: var(--forge-cyan);
}

.forge-theme-dropdown .forge-theme-menu {
  --bs-dropdown-min-width: 11.75rem;
  margin-top: 0.35rem !important;
  padding: 0.3rem;
  border-radius: 12px;
  border: 1px solid var(--forge-border);
  background: rgba(17, 24, 39, 0.92) !important;
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(6, 182, 212, 0.08),
    0 0 40px rgba(6, 182, 212, 0.06);
}

.forge-theme-dropdown .forge-theme-option {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-weight: 600;
  font-size: 0.8125rem;
  border-radius: 8px;
  padding: 0.38rem 0.5rem;
  color: var(--forge-text-2);
  transition: background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.forge-theme-dropdown .forge-theme-option .forge-theme-opt-ico {
  flex-shrink: 0;
  color: var(--forge-text-3);
  transition: color 0.2s ease;
}

.forge-theme-dropdown .forge-theme-option .forge-theme-tick {
  margin-left: auto;
  flex-shrink: 0;
  opacity: 0;
  transform: scale(0.6);
  color: var(--forge-cyan);
  transition: opacity 0.25s ease, transform 0.3s cubic-bezier(0.34, 1.45, 0.64, 1);
}

.forge-theme-dropdown .forge-theme-option.active .forge-theme-tick {
  opacity: 1;
  transform: scale(1);
}

.forge-theme-dropdown .forge-theme-option.active {
  background: rgba(6, 182, 212, 0.1);
  color: var(--forge-text);
  box-shadow: inset 0 0 0 1px rgba(6, 182, 212, 0.2);
}

.forge-theme-dropdown .forge-theme-option.active .forge-theme-opt-ico {
  color: var(--forge-amber);
}

.forge-theme-dropdown .forge-theme-option:hover,
.forge-theme-dropdown .forge-theme-option:focus {
  background: var(--forge-cyan-dim);
  color: var(--forge-cyan);
}

.forge-theme-dropdown .forge-theme-option:hover .forge-theme-opt-ico,
.forge-theme-dropdown .forge-theme-option:focus .forge-theme-opt-ico {
  color: var(--forge-cyan);
}

@media (max-width: 575.98px) {
  .forge-theme-dropdown .forge-theme-eyebrow {
    display: none;
  }
  .forge-theme-dropdown .forge-theme-trigger__inner {
    padding: 0.26rem 0.42rem;
    gap: 0.38rem;
  }
  .forge-theme-dropdown .forge-theme-current {
    font-size: 0.78rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .forge-theme-dropdown .forge-theme-trigger::before,
  .forge-theme-dropdown .forge-theme-trigger__aurora,
  .forge-theme-dropdown .forge-theme-current {
    animation: none;
  }
  .forge-theme-dropdown .forge-theme-trigger,
  .forge-theme-dropdown .forge-theme-ico,
  .forge-theme-dropdown .forge-theme-option .forge-theme-tick {
    transition-duration: 0.01ms;
  }
}

/* =================================================================
   13. CODE BLOCKS & TREES
   ================================================================= */
.forge-code {
  background: var(--forge-surface);
  border: 1px solid var(--forge-border);
  border-radius: 12px;
  padding: 1rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--forge-text-2);
  overflow-x: auto;
}
.forge-code .comment { color: var(--forge-text-3); }
.forge-code .highlight { color: var(--forge-cyan); }
.forge-code .keyword { color: var(--forge-amber); }

kbd {
  background: var(--forge-surface-2);
  border: 1px solid var(--forge-border);
  border-radius: 4px;
  padding: 0.1rem 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.8em;
  color: var(--forge-text-2);
}
code {
  color: var(--forge-cyan);
  background: var(--forge-cyan-dim);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
}

/* =================================================================
   14. DIAGRAM WRAPPER (Mermaid)
   ================================================================= */
.forge-diagram {
  background: var(--forge-surface);
  border: 1px solid var(--forge-border);
  border-radius: 12px;
  padding: 1.5rem;
}
.forge-diagram .mermaid svg { background: transparent !important; }
.forge-diagram .node rect,
.forge-diagram .node polygon {
  fill: var(--forge-surface-2) !important;
  stroke: rgba(6,182,212,0.35) !important;
  stroke-width: 1.5px !important;
  rx: 6 !important;
  ry: 6 !important;
}
.forge-diagram .node .label,
.forge-diagram .nodeLabel {
  color: var(--forge-text) !important;
  fill: var(--forge-text) !important;
  font-family: var(--bs-body-font-family) !important;
}
.forge-diagram .cluster rect {
  fill: rgba(6,182,212,0.04) !important;
  stroke: rgba(6,182,212,0.15) !important;
  stroke-width: 1px !important;
  rx: 10 !important;
  ry: 10 !important;
}
.forge-diagram .cluster span,
.forge-diagram .cluster .nodeLabel {
  color: var(--forge-text-3) !important;
  fill: var(--forge-text-3) !important;
  font-family: var(--font-label) !important;
  font-weight: 700 !important;
  font-size: 0.7rem !important;
  letter-spacing: 0.05em !important;
  text-transform: uppercase !important;
}
.forge-diagram .edgePath path.path {
  stroke: rgba(6,182,212,0.35) !important;
  stroke-width: 1.5px !important;
}
.forge-diagram .edgePath marker path {
  fill: rgba(6,182,212,0.5) !important;
  stroke: rgba(6,182,212,0.5) !important;
}
.forge-diagram .edgeLabel,
.forge-diagram .edgeLabel rect {
  background-color: var(--forge-surface) !important;
  fill: var(--forge-surface) !important;
}
.forge-diagram .edgeLabel span,
.forge-diagram .edgeLabel .edgeLabel {
  color: var(--forge-amber) !important;
  fill: var(--forge-amber) !important;
  font-family: var(--font-label) !important;
  font-weight: 700 !important;
  font-size: 0.65rem !important;
  letter-spacing: 0.03em !important;
}

/* =================================================================
   15. DIVIDERS
   ================================================================= */
.forge-divider {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--forge-border-hover), transparent);
  margin: 3rem 0;
}

/* =================================================================
   16. IDLE PULSE (always-on ambient glow)
   ================================================================= */
@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 4px rgba(6,182,212,0.2); }
  50%      { box-shadow: 0 0 12px rgba(6,182,212,0.4); }
}
.pulse { animation: pulse-glow 3s ease-in-out infinite; }

@keyframes pulse-amber {
  0%, 100% { box-shadow: 0 0 4px rgba(245,158,11,0.2); }
  50%      { box-shadow: 0 0 12px rgba(245,158,11,0.35); }
}
.pulse-amber { animation: pulse-amber 3s ease-in-out infinite; }

/* =================================================================
   17. HOVER BREATHING — expanding outline pulse
   ================================================================= */
@keyframes breathe-amber {
  0%   { outline-offset: 0px;  outline-color: rgba(245,158,11,0.35); box-shadow: 0 0 4px rgba(245,158,11,0.08); }
  50%  { outline-offset: 5px;  outline-color: rgba(245,158,11,0.12); box-shadow: 0 0 16px rgba(245,158,11,0.15); }
  100% { outline-offset: 0px;  outline-color: rgba(245,158,11,0.35); box-shadow: 0 0 4px rgba(245,158,11,0.08); }
}
@keyframes breathe-cyan {
  0%   { outline-offset: 0px;  outline-color: rgba(6,182,212,0.30); box-shadow: 0 0 4px rgba(6,182,212,0.08); }
  50%  { outline-offset: 5px;  outline-color: rgba(6,182,212,0.10); box-shadow: 0 0 16px rgba(6,182,212,0.15); }
  100% { outline-offset: 0px;  outline-color: rgba(6,182,212,0.30); box-shadow: 0 0 4px rgba(6,182,212,0.08); }
}

.breathe-link {
  position: relative;
  outline: 1px solid transparent;
  outline-offset: 0px;
  transition: border-color 0.25s, transform 0.25s, outline-color 0.25s;
}
.breathe-link::before {
  content: "\2192";
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  font-size: 0.85rem;
  color: var(--forge-amber);
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity 0.25s, transform 0.25s;
  pointer-events: none;
  z-index: 1;
}
.breathe-link:hover {
  border-color: rgba(245,158,11,0.35);
  outline-style: solid;
  outline-width: 1px;
  animation: breathe-amber 2.2s ease-in-out infinite;
  transform: translateY(-2px);
}
.breathe-link:hover::before {
  opacity: 1;
  transform: translateX(0);
}

.breathe-static {
  outline: 1px solid transparent;
  outline-offset: 0px;
  transition: border-color 0.25s, outline-color 0.25s;
}
.breathe-static:hover {
  border-color: rgba(6,182,212,0.3);
  outline-style: solid;
  outline-width: 1px;
  animation: breathe-cyan 2.5s ease-in-out infinite;
}

/* =================================================================
   18. FLOW DIAGRAM (pure CSS)
   ================================================================= */
.forge-flow {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex-wrap: wrap;
  justify-content: center;
}
.forge-flow-node {
  background: var(--forge-surface);
  border: 1px solid var(--forge-border);
  border-radius: 8px;
  padding: 0.4rem 0.75rem;
  font-family: var(--font-label);
  font-size: 0.65rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--forge-text-2);
  transition: all 0.2s;
  white-space: nowrap;
}
.forge-flow-node:hover {
  border-color: var(--forge-cyan);
  color: var(--forge-cyan);
  box-shadow: var(--forge-glow-cyan);
}
.forge-flow-node.node-active {
  border-color: var(--forge-amber);
  color: var(--forge-amber);
  background: var(--forge-amber-dim);
}
.forge-flow-arrow {
  color: var(--forge-text-3);
  font-size: 0.75rem;
}

/* =================================================================
   19. STAT COUNTERS
   ================================================================= */
.forge-stat { text-align: center; }
.forge-stat .stat-value {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 2.5rem;
  letter-spacing: -0.04em;
  line-height: 1;
}
.forge-stat .stat-label {
  font-family: var(--font-label);
  font-size: 0.55rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--forge-text-4);
  margin-top: 0.5rem;
}

/* =================================================================
   20. SCROLLBAR
   ================================================================= */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--forge-bg); }
::-webkit-scrollbar-thumb { background: rgba(6,182,212,0.2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(6,182,212,0.4); }

/* =================================================================
   21. EXPANDABLE DIAGRAM OVERLAY (modal)
   ================================================================= */
.forge-diagram-trigger {
  cursor: pointer;
  position: relative;
  outline: 1px solid transparent;
  outline-offset: 0px;
}
.forge-diagram-trigger::after {
  content: "Click to expand";
  position: absolute;
  bottom: 0.75rem;
  right: 0.75rem;
  font-family: var(--font-label);
  font-size: 0.55rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--forge-text-4);
  background: var(--forge-surface);
  border: 1px solid var(--forge-border);
  border-radius: 6px;
  padding: 0.2rem 0.5rem;
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
}
.forge-diagram-trigger:hover::after { opacity: 1; }
.forge-diagram-trigger:hover {
  border-color: rgba(6,182,212,0.3);
  outline-style: solid;
  outline-width: 1px;
  animation: breathe-cyan 2.5s ease-in-out infinite;
}

.diagram-modal-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(5,7,12,0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  /* Equal inset on all sides; used for dialog max dimensions */
  --diagram-modal-gutter: clamp(1rem, 3vmin, 2rem);
  padding: var(--diagram-modal-gutter);
  overflow-y: auto;
  overflow-x: hidden;
  box-sizing: border-box;
}
.diagram-modal-backdrop.active {
  display: flex;
  align-items: center;
  justify-content: center;
}
.diagram-modal {
  background: var(--forge-surface);
  border: 1px solid var(--forge-border);
  border-radius: 16px;
  width: min(1400px, calc(100vw - 2 * var(--diagram-modal-gutter)));
  max-width: min(1400px, calc(100vw - 2 * var(--diagram-modal-gutter)));
  max-height: calc(100vh - 2 * var(--diagram-modal-gutter));
  margin: 0;
  flex-shrink: 0;
  overflow: hidden;
  box-shadow: 0 0 60px rgba(6,182,212,0.08), 0 0 2px rgba(6,182,212,0.15);
  display: flex;
  flex-direction: column;
}
.diagram-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.5rem;
  border-bottom: 1px solid var(--forge-border);
}
.diagram-modal-header h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.1rem;
  margin: 0;
}
.diagram-modal-close {
  background: none;
  border: 1px solid var(--forge-border);
  border-radius: 8px;
  color: var(--forge-text-3);
  cursor: pointer;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: all 0.15s;
}
.diagram-modal-close:hover {
  color: var(--forge-text);
  border-color: var(--forge-border-hover);
  background: var(--forge-surface-2);
}
.diagram-modal-body {
  display: grid;
  grid-template-columns: 1fr min(320px, 34vw);
  min-height: 0;
  flex: 1 1 auto;
  overflow: hidden;
  align-items: stretch;
}
@media (max-width: 767px) {
  .diagram-modal-body { grid-template-columns: 1fr; }
}
.diagram-modal-canvas {
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: auto;
  max-height: min(62vh, 560px);
  min-height: 0;
}
.diagram-modal-canvas > svg,
.diagram-modal-canvas > img {
  margin-left: auto;
  margin-right: auto;
  display: block;
}
.diagram-modal-static-hint {
  flex-shrink: 0;
  width: 100%;
  font-size: 0.75rem;
  color: var(--forge-text-2);
  background: rgba(245,158,11,0.08);
  border: 1px solid rgba(245,158,11,0.28);
  border-radius: 10px;
  padding: 0.65rem 0.85rem;
  margin-bottom: 0.75rem;
  line-height: 1.45;
}
.diagram-modal-static-hint code {
  font-size: 0.68rem;
  word-break: break-word;
}
.diagram-modal-canvas svg {
  width: 100% !important;
  max-width: 100%;
  height: auto;
  max-height: min(52vh, 480px);
  pointer-events: auto;
}
/* Ensure glyph hit targets (some UAs skip unpainted text for pointer events). */
.diagram-modal-canvas .svg-node-zone text,
.diagram-modal-canvas .svg-node-zone tspan {
  pointer-events: auto;
}
/* Scale up text inside expanded diagram */
.diagram-modal-canvas .node .label,
.diagram-modal-canvas .nodeLabel {
  font-size: 1rem !important;
  font-weight: 600 !important;
}
.diagram-modal-canvas .cluster span,
.diagram-modal-canvas .cluster .nodeLabel {
  font-size: 0.85rem !important;
  font-weight: 600 !important;
  letter-spacing: 0.08em !important;
}
.diagram-modal-canvas .edgeLabel span,
.diagram-modal-canvas .edgeLabel .edgeLabel {
  font-size: 0.8rem !important;
  font-weight: 500 !important;
}
.diagram-modal-detail {
  border-left: 1px solid var(--forge-border);
  padding: 1.25rem;
  background: var(--forge-surface-2);
  overflow-y: auto;
  overflow-x: hidden;
  max-height: min(62vh, 560px);
  min-height: 0;
}
.diagram-modal-detail .detail-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 0.85rem;
}
.diagram-modal-detail .detail-item {
  margin-bottom: 0.75rem;
  padding: 0.75rem 0.9rem;
  border-radius: 10px;
  border: 1px solid var(--forge-border);
  background: var(--forge-surface);
  box-shadow: 0 1px 2px rgba(0,0,0,0.12), 0 0 0 1px rgba(255,255,255,0.02);
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}
.diagram-modal-detail .detail-item:last-child {
  margin-bottom: 0;
}
.diagram-modal-detail .detail-item:hover {
  border-color: rgba(6,182,212,0.35);
  box-shadow: 0 0 0 1px rgba(6,182,212,0.12), 0 4px 16px rgba(0,0,0,0.18);
}
.diagram-modal-detail .detail-item .detail-term {
  font-family: var(--font-label);
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.2rem;
}
.diagram-modal-detail .detail-item .detail-desc {
  font-size: 0.85rem;
  color: var(--forge-text-3);
  line-height: 1.5;
}

/* =================================================================
   22. INTERACTIVE NODE ↔ DETAIL HIGHLIGHT
   ================================================================= */
@keyframes diagram-detail-breathe {
  0%, 100% {
    box-shadow: inset 0 0 0 1px rgba(6,182,212,0.28), 0 0 2px rgba(6,182,212,0.12);
  }
  50% {
    box-shadow: inset 0 0 0 2px rgba(6,182,212,0.45), 0 0 14px rgba(6,182,212,0.22);
  }
}
.diagram-modal-detail .detail-item.highlight {
  background: rgba(6,182,212,0.08);
  border-color: rgba(6,182,212,0.35);
  outline: none;
  animation: diagram-detail-breathe 2s ease-in-out infinite;
}
.diagram-modal-detail .detail-item.highlight .detail-desc {
  color: var(--forge-text-2);
}

/* Inline-SVG diagram zones (showcase modal) — keep in theme so hover works on every page */
.diagram-modal-canvas .svg-node-zone {
  cursor: pointer;
  pointer-events: all;
}
.diagram-modal-canvas .svg-node-zone rect,
.diagram-modal-canvas .svg-node-zone polygon,
.diagram-modal-canvas .svg-node-zone polyline,
.diagram-modal-canvas .svg-node-zone line,
.diagram-modal-canvas .svg-node-zone circle,
.diagram-modal-canvas .svg-node-zone path,
.diagram-modal-canvas .svg-node-zone ellipse {
  transition: filter 0.2s ease, stroke 0.2s ease, stroke-width 0.2s ease;
}
/* Glow + stroke on shapes (filter on <g> is inconsistent across SVG engines) */
@keyframes diagram-svg-node-breathe {
  0%, 100% {
    stroke: rgba(6,182,212,0.9);
    stroke-width: 2px;
    filter: drop-shadow(0 0 2px rgba(6,182,212,0.15));
  }
  50% {
    stroke: rgba(34,211,238,1);
    stroke-width: 3.5px;
    filter: drop-shadow(0 0 14px rgba(6,182,212,0.55));
  }
}
@keyframes diagram-svg-label-glow {
  0%, 100% { filter: drop-shadow(0 0 2px rgba(6,182,212,0.2)); }
  50% { filter: drop-shadow(0 0 10px rgba(6,182,212,0.55)); }
}
.diagram-modal-canvas .svg-node-zone.active rect,
.diagram-modal-canvas .svg-node-zone.active polygon,
.diagram-modal-canvas .svg-node-zone.active polyline,
.diagram-modal-canvas .svg-node-zone.active line,
.diagram-modal-canvas .svg-node-zone.active circle,
.diagram-modal-canvas .svg-node-zone.active path,
.diagram-modal-canvas .svg-node-zone.active ellipse {
  stroke: var(--forge-cyan) !important;
  animation: diagram-svg-node-breathe 2s ease-in-out infinite;
}
/* Series colors are preserved via animation keyframes using cyan pulse; legend lines included */
.diagram-modal-canvas .svg-node-zone.active text {
  animation: diagram-svg-label-glow 2s ease-in-out infinite;
}

@keyframes node-breathe-stroke {
  0%   { stroke-width: 1.5px; }
  50%  { stroke-width: 4px; }
  100% { stroke-width: 1.5px; }
}
@keyframes node-breathe-glow {
  0%   { filter: drop-shadow(0 0 1px rgba(6,182,212,0.1)); }
  50%  { filter: drop-shadow(0 0 8px rgba(6,182,212,0.35)); }
  100% { filter: drop-shadow(0 0 1px rgba(6,182,212,0.1)); }
}
.diagram-modal-canvas .node {
  cursor: pointer;
  transition: filter 0.25s;
}
.diagram-modal-canvas .node.node-glow {
  animation: node-breathe-glow 2s ease-in-out infinite;
}
.diagram-modal-canvas .node.node-glow rect,
.diagram-modal-canvas .node.node-glow polygon,
.diagram-modal-canvas .node.node-glow circle,
.diagram-modal-canvas .node.node-glow .label-container {
  stroke: var(--forge-cyan) !important;
  animation: node-breathe-stroke 2s ease-in-out infinite !important;
}

/* --- Cluster / subgraph breathing when child node is hovered ---- */
@keyframes cluster-breathe-stroke {
  0%   { stroke-width: 1px; }
  50%  { stroke-width: 3px; }
  100% { stroke-width: 1px; }
}
@keyframes cluster-breathe-glow {
  0%   { filter: drop-shadow(0 0 1px rgba(6,182,212,0.05)); }
  50%  { filter: drop-shadow(0 0 12px rgba(6,182,212,0.25)); }
  100% { filter: drop-shadow(0 0 1px rgba(6,182,212,0.05)); }
}
.diagram-modal-canvas .cluster {
  cursor: pointer;
  transition: filter 0.25s;
}
.diagram-modal-canvas .cluster.cluster-glow {
  animation: cluster-breathe-glow 2s ease-in-out infinite;
}
.diagram-modal-canvas .cluster.cluster-glow rect {
  stroke: var(--forge-cyan) !important;
  animation: cluster-breathe-stroke 2s ease-in-out infinite !important;
}
.diagram-modal-canvas .cluster.cluster-glow span,
.diagram-modal-canvas .cluster.cluster-glow .nodeLabel {
  color: var(--forge-cyan) !important;
  fill: var(--forge-cyan) !important;
}

/* =================================================================
   23. TOPIC PREVIEW MODAL (full-page topic in iframe + optional TOC rail)
   ================================================================= */
.topic-preview-modal-backdrop .diagram-modal {
  width: min(1280px, calc(100vw - 2 * var(--diagram-modal-gutter)));
  max-width: min(1280px, calc(100vw - 2 * var(--diagram-modal-gutter)));
  position: relative;
}

.topic-preview-modal-sr-title {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.topic-preview-modal-toolbar {
  position: absolute;
  top: 0.45rem;
  right: 0.55rem;
  z-index: 6;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.topic-preview-modal-close.diagram-modal-close {
  flex-shrink: 0;
}

.topic-preview-open-full {
  font-family: var(--font-label);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--forge-text-3);
  text-decoration: none;
  padding: 0.35rem 0.65rem;
  border-radius: 8px;
  border: 1px solid var(--forge-border);
  white-space: nowrap;
  background: var(--forge-surface);
}

.topic-preview-open-full:hover {
  color: var(--forge-cyan);
  border-color: rgba(6, 182, 212, 0.35);
  text-decoration: none;
}

.topic-preview-modal-body.diagram-modal-body {
  display: grid !important;
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: minmax(min(78vh, 720px), 1fr);
  flex: 1 1 auto;
  min-height: 0;
  padding: 0 !important;
  align-items: stretch;
  align-content: stretch;
}

.topic-preview-modal-body.topic-preview-modal-body--with-rail {
  grid-template-columns: minmax(0, 1fr) min(13.5rem, 32%) !important;
}

@media (max-width: 767.98px) {
  .topic-preview-modal-body.topic-preview-modal-body--with-rail {
    grid-template-columns: minmax(0, 1fr) !important;
    grid-template-rows: auto auto;
  }
}

.topic-preview-modal-canvas.diagram-modal-canvas {
  max-height: none !important;
  min-height: min(78vh, 720px);
  height: 100%;
  padding: 0 !important;
  background: var(--fs-bg, var(--forge-bg));
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: stretch;
  overflow: hidden;
}

.topic-preview-iframe {
  width: 100%;
  flex: 1 1 auto;
  min-height: min(78vh, 720px);
  border: 0;
  display: block;
  background: var(--fs-bg, var(--forge-bg));
}

.topic-preview-toc-rail {
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  border-left: 1px solid var(--forge-border);
  background: var(--forge-bg-elevated, var(--forge-surface-2));
  padding: 0.55rem 0.45rem 0.75rem 0.55rem;
  min-height: 0;
  min-width: 0;
  max-height: min(78vh, 720px);
  align-self: start;
  font-size: 0.78rem;
}

@media (max-width: 767.98px) {
  .topic-preview-toc-rail:not([hidden]) {
    max-height: 11rem;
    border-left: none;
    border-top: 1px solid var(--forge-border);
  }
}

.topic-preview-toc-rail__inner .toc {
  margin: 0;
  padding: 0;
  border: none;
  background: transparent;
  max-height: none;
  overflow: visible;
}

.topic-preview-toc-rail__inner .toc ul {
  margin-bottom: 0;
  padding-left: 1rem;
}

.topic-preview-toc-rail__inner .toc a {
  color: var(--forge-text-3);
  text-decoration: none;
  display: inline-block;
  padding: 0.12rem 0;
  line-height: 1.35;
}

.topic-preview-toc-rail__inner .toc a:hover,
.topic-preview-toc-rail__inner .toc a:focus-visible {
  color: var(--forge-cyan);
  text-decoration: underline;
}

.topic-preview-toc-rail__inner .toc-title,
.topic-preview-toc-rail__inner p.toc-title {
  font-family: var(--font-label);
  font-size: 0.58rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--forge-text-3);
  margin: 0 0 0.35rem;
}