/* =========================================================
   ARC21 Framework — Base Stylesheet
   Sites override the :root palette tokens in site.css.
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@400;500;600;700&family=Inter:wght@400;500;600;700;800&display=swap');

/* ---------- Tokens (neutral placeholder palette — override in site.css) ---------- */
:root {
  --bg:          #0d0d0d;
  --paper:       #161616;
  --panel:       rgba(22, 22, 22, 0.88);
  --panel-2:     rgba(20, 20, 20, 0.76);
  --panel-3:     rgba(16, 16, 16, 0.72);
  --ink:         #f0f0f0;
  --ink-strong:  #ffffff;
  --muted:       #999999;
  --muted-2:     #bbbbbb;
  --line:        rgba(68, 136, 255, 0.15);
  --line-strong: rgba(68, 136, 255, 0.30);
  --accent:      #4488ff;
  --accent-2:    #2266dd;
  --accent-soft: rgba(68, 136, 255, 0.14);
  --link:        #88aaff;
  --link-hover:  #bbccff;
  --accent-glow: rgba(68, 136, 255, 0.55);
  --accent-fg:   #0d0d0d;
  --danger:      #ff8a65;
  --ok:          #5fd49a;
  --ext-ref:     #b87fff;
  --ext-ref-soft: rgba(184, 127, 255, 0.14);
  --shadow:      0 24px 80px rgba(0, 0, 0, 0.45);
  --shadow-sm:   0 12px 34px rgba(0, 0, 0, 0.28);
  --radius:      22px;
  --radius-sm:   14px;
  --max:         min(100%, 1760px);
  --font-body:   "Inter", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-heading:"IBM Plex Sans", "Inter", ui-sans-serif, system-ui, sans-serif;
}

/* ---------- Base ---------- */
* { box-sizing: border-box; }
html { background: var(--bg); }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, var(--line), transparent 32rem),
    radial-gradient(circle at 78% 8%, var(--accent-soft), transparent 24rem),
    radial-gradient(circle at bottom right, var(--line), transparent 34rem),
    linear-gradient(180deg, #070a0d 0%, #0a0e12 45%, #080b0e 100%);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
button, input, textarea, select { font-family: inherit; }

h1, h2, h3, .eyebrow, .nav, .nav-context, .relation-summary, .concept-index-header h2 {
  font-family: var(--font-heading);
  color: var(--ink-strong);
}
h1 { margin: 0 0 1rem; font-size: clamp(2.7rem, 8vw, 6.25rem); line-height: 0.92; letter-spacing: -0.08em; }
h2 { margin: 0 0 0.8rem; font-size: clamp(1.05rem, 2vw, 1.45rem); letter-spacing: -0.03em; }
p  { line-height: 1.65; color: var(--muted); max-width: 74ch; }
a  { color: var(--link); text-decoration-thickness: 0.08em; text-underline-offset: 0.18em; }
a:hover { color: var(--link-hover); }
code {
  padding: 0.08rem 0.32rem;
  border-radius: 0.35rem;
  background: var(--accent-soft);
  color: #ffd99b;
  font-size: 0.92em;
}
.hidden { display: none !important; }

/* ---------- Topbar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 1rem;
  padding: 0.85rem clamp(1rem, 4vw, 2.5rem);
  background: rgba(8, 11, 14, 0.86);
  border-bottom: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(16px);
}
.brand-logo {
  flex: 0 0 auto;
  display: flex; align-items: center;
  width: 10.5rem; height: 3rem;
  filter: drop-shadow(0 0 14px var(--accent-soft));
  text-decoration: none;
}
.brand-logo img { display: block; width: 100%; height: 100%; object-fit: contain; }

.nav { flex: 0 0 auto; display: flex; gap: 0.5rem; align-items: center; flex-wrap: wrap; }

/* Skin switcher — rendered in both the main nav and the overlay bar */
.skin-select, .locale-select {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(16, 21, 27, 0.82);
  color: var(--ink);
  padding: 0.45rem 0.9rem;
  font: inherit;
  font-size: 0.8rem;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  padding-right: 1.6rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23a69d91'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.55rem center;
  transition: border-color 120ms ease;
}
.skin-select:focus, .skin-select:hover,
.locale-select:focus, .locale-select:hover {
  border-color: var(--line-strong);
  outline: none;
}
.skin-select option, .locale-select option { background: #10151b; color: var(--ink); }
.nav-link, .nav-button, .secondary {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(16, 21, 27, 0.82);
  color: var(--ink);
  padding: 0.55rem 0.95rem;
  font: inherit;
  text-decoration: none;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
  transition: background 120ms ease, border-color 120ms ease, color 120ms ease;
}
.nav-link:hover, .nav-button:hover, .secondary:hover {
  background: var(--accent-soft);
  border-color: var(--line-strong);
  color: #fff6e6;
}
.primary, .start-link {
  display: inline-flex; align-items: center; justify-content: center;
  border: 0; border-radius: 999px;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
  color: var(--accent-fg);
  padding: 0.78rem 1.1rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  box-shadow: 0 10px 30px var(--line-strong), inset 0 1px 0 rgba(255, 255, 255, 0.28);
  transition: background 120ms ease, transform 120ms ease;
}
.primary:hover, .start-link:hover {
  background: linear-gradient(180deg, var(--link), var(--accent-2));
  color: #080b0e;
}
.disabled { opacity: 0.45; pointer-events: none; }
.icon-button { border: 0; background: transparent; font-size: 2rem; cursor: pointer; color: var(--muted-2); }
.icon-button:hover { color: var(--link); }

/* Path trail */
.nav-context {
  flex: 1 1 auto; min-width: 0;
  display: grid; grid-template-columns: minmax(0, 1fr); align-items: center;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(13, 17, 22, 0.78);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}
.nav-concept-name { display: none; }
.path-trail {
  min-width: 0;
  overflow-x: auto; overflow-y: hidden;
  white-space: nowrap;
  font-size: 0.8rem; line-height: 1.3;
  color: var(--muted-2);
  scrollbar-width: thin;
}
.path-trail::-webkit-scrollbar { height: 6px; }
.path-trail::-webkit-scrollbar-thumb { background: var(--line-strong); border-radius: 999px; }
.path-link { color: #d7c7b0; text-decoration: none; }
.path-link:hover { color: var(--link); text-decoration: underline; }
.path-link[aria-current="page"] {
  color: var(--accent); font-weight: 800;
  text-shadow: 0 0 16px var(--line);
}
.path-separator { display: inline-block; margin: 0 0.45rem; color: var(--line-strong); }

/* Hidden file inputs */
.visually-hidden-file {
  position: absolute !important;
  width: 1px !important; height: 1px !important;
  padding: 0 !important; margin: -1px !important;
  overflow: hidden !important; clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important; border: 0 !important;
}

/* ---------- Layout ---------- */
.app {
  width: min(100% - clamp(1rem, 3vw, 3rem), var(--max));
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(1rem, 4vw, 2.5rem) 0;
}

/* ---------- Hero ---------- */
.hero {
  min-height: calc(100vh - 6rem);
  display: grid;
  place-items: center;
}
.hero-card {
  width: 100%;
  background:
    linear-gradient(180deg, rgba(19, 24, 30, 0.96), rgba(12, 16, 20, 0.94)),
    radial-gradient(circle at 18% 0%, var(--line), transparent 26rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
  padding: clamp(1.25rem, 5vw, 4rem);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: start;
}
.hero-text { min-width: 0; }
.hero-card h1 {
  font-family: var(--font-heading);
  font-size: clamp(2.6rem, 6.5vw, 5.6rem);
  line-height: 0.94;
  letter-spacing: -0.07em;
  max-width: 14ch;
}
.eyebrow {
  margin: 0 0 0.8rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  font-weight: 800;
}
.hero-lede {
  font-size: 1.08rem;
  line-height: 1.65;
  color: #d7cfc3;
  max-width: 60ch;
}
.hero-lede strong { color: var(--ink-strong); font-weight: 600; }

/* Dataset summary card */
.dataset-summary {
  margin: 1.4rem 0 1.1rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--panel-3);
  display: grid;
  gap: 0.45rem;
}
.dataset-summary-row {
  display: flex; align-items: center; gap: 0.6rem; flex-wrap: wrap;
  font-size: 0.92rem; color: var(--muted-2);
}
.dataset-summary-row code { font-size: 0.85rem; }
.dataset-pill {
  display: inline-flex; align-items: center;
  padding: 0.18rem 0.62rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(15, 20, 26, 0.6);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.dataset-pill-ok    { color: var(--ok);    border-color: rgba(95, 212, 154, 0.4); background: rgba(95, 212, 154, 0.10); }
.dataset-pill-empty { color: var(--muted); border-color: rgba(166, 157, 145, 0.3); }
.dataset-summary-stats {
  display: flex; flex-wrap: wrap; gap: 1.2rem;
  font-size: 0.92rem; color: var(--muted-2);
}
.dataset-summary-stats strong { color: var(--ink-strong); font-weight: 700; }

.hero-actions {
  display: flex; flex-wrap: wrap; gap: 0.6rem;
  margin: 1.1rem 0 0.4rem;
}
.hero-card.is-empty .start-link { opacity: 0.5; pointer-events: none; }

/* Hero loader (collapsed when data is loaded) */
.hero-loader {
  margin-top: 1.2rem;
  padding: 1rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--panel-2);
}
.hero-loader > summary {
  cursor: pointer; user-select: none;
  font-weight: 700; color: var(--muted-2);
  list-style: none;
  display: flex; align-items: center; gap: 0.4rem;
}
.hero-loader > summary::before {
  content: "+"; display: inline-block;
  width: 1.1rem; height: 1.1rem;
  text-align: center; line-height: 1.1rem;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  color: var(--accent);
  transition: transform 120ms ease;
}
.hero-loader[open] > summary::before { content: "−"; }
.hero-loader[open] > summary { margin-bottom: 0.5rem; color: var(--ink); }
.hero-card.is-loaded .hero-loader { background: transparent; }

/* Hero diagram */
.hero-diagram-frame {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: rgba(8, 11, 14, 0.55);
  box-shadow: var(--shadow-sm);
}
.hero-diagram {
  display: block;
  width: 100%;
  background: #070b14;
}
.hero-diagram .hero-diagram-svg {
  display: block;
  width: 100%;
  height: auto;
}
.hero-diagram-empty {
  margin: 0;
  padding: clamp(2rem, 6vw, 4rem) 1.5rem;
  text-align: center;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  color: var(--muted);
}
.hero-diagram-node,
.hero-diagram-center {
  transition: filter 120ms ease, transform 120ms ease;
  transform-origin: center;
  transform-box: fill-box;
}
.hero-diagram-node:hover,
.hero-diagram-center:hover {
  filter: drop-shadow(0 0 16px var(--accent-glow));
}
.hero-diagram-node:hover rect:first-of-type {
  fill: #112033;
}
.hero-diagram-frame figcaption {
  padding: 0.55rem 0.9rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--panel-3);
  border-top: 1px solid var(--line);
}

/* ---------- Forms / fields ---------- */
.loader-card {
  margin-top: 1.5rem;
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel-2);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.035);
}
.loader-card h2 { color: var(--ink-strong); margin-top: 0; }
.field, .file-field {
  display: grid; gap: 0.45rem;
  margin: 0.8rem 0;
  color: var(--muted);
  font-size: 0.95rem;
}
.field-label, .file-name, .file-note, .note,
.help-content p, .help-content li { color: var(--muted); }
.file-note { font-size: 0.82rem; line-height: 1.35; margin-top: -0.25rem; }
.file-loader { display: grid; gap: 0.55rem; margin: 0.8rem 0; }
input[type="text"], input[type="file"], input[type="url"] {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(7, 10, 13, 0.78);
  color: var(--ink);
  padding: 0.78rem 0.95rem;
  font: inherit;
}
input::placeholder { color: rgba(244, 239, 230, 0.42); }
.divider {
  display: flex; align-items: center; gap: 1rem;
  margin: 1.1rem 0;
  color: var(--muted);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.divider::before, .divider::after {
  content: ""; height: 1px; background: var(--line); flex: 1;
}
.status {
  margin-top: 1rem;
  padding: 0.6rem 0.75rem;
  border-radius: 12px;
  background: var(--accent-soft);
  color: #ffd99b;
  font-weight: 600;
  line-height: 1.5;
}
.status:empty { display: none; }
.status.error { background: rgba(255, 138, 101, 0.10); color: var(--danger); }
.error-box {
  border: 1px solid rgba(255, 138, 101, 0.35);
  background: rgba(255, 138, 101, 0.06);
  color: var(--danger);
  border-radius: 18px;
  padding: 1rem;
}

/* ---------- Concept shell ---------- */
.concept-shell {
  display: grid;
  grid-template-columns: clamp(230px, 18vw, 340px) minmax(0, 1fr);
  gap: clamp(1rem, 2vw, 2.25rem);
  align-items: start;
  transition: grid-template-columns 0.3s ease;
}
.concept-shell.sidebar-collapsed {
  grid-template-columns: 0px minmax(0, 1fr);
}
.concept-shell.sidebar-collapsed .concept-index-pane {
  opacity: 0;
  pointer-events: none;
}
.concept-index-pane { transition: opacity 0.3s ease; }

/* ── Sidebar collapse toggle (inside pane) ─────────────── */
.sidebar-toggle-btn {
  position: absolute;
  top: 0.35rem;
  right: 0.35rem;
  z-index: 1;
  width: 1.5rem;
  height: 1.5rem;
  border: none;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  border-radius: 4px;
  font-size: 1rem;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: color 0.2s, background 0.2s;
}
.sidebar-toggle-btn:hover {
  color: var(--accent);
  background: var(--accent-soft);
}

/* ── Sidebar expand tab (fixed left edge, toggles sidebar) */
.sidebar-expand-tab {
  display: flex;
  position: fixed;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  z-index: 50;
  width: 1.25rem;
  height: 3.5rem;
  border: 1px solid var(--line);
  border-left: none;
  border-radius: 0 6px 6px 0;
  background: var(--paper);
  color: var(--muted);
  cursor: pointer;
  font-size: 0.85rem;
  padding: 0;
  align-items: center;
  justify-content: center;
  transition: color 0.2s, background 0.2s;
}
.sidebar-expand-tab:hover { color: var(--accent); background: var(--accent-soft); }

/* ── Sidebar tab (shared by all full-page skins) ────────── */
.skin-sidebar-tab {
  position: fixed;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  z-index: 410;
  width: 1.6rem;
  height: 5rem;
  border: 1px solid var(--line-strong);
  border-left: none;
  border-radius: 0 8px 8px 0;
  background: var(--paper);
  color: var(--muted-2);
  cursor: pointer;
  font-size: 1.25rem;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 2px 0 10px rgba(0,0,0,0.4);
  transition: color 0.2s, background 0.2s, box-shadow 0.2s;
}
.skin-sidebar-tab:hover {
  color: var(--accent);
  background: var(--accent-soft);
  box-shadow: 2px 0 14px var(--line-strong);
}

/* ── Sidebar overlay (used by full-page skins like concept-scrolly) */
.sidebar-overlay {
  position: fixed !important;
  left: 0 !important;
  top: 0 !important;
  height: 100dvh !important;
  width: clamp(230px, 18vw, 340px) !important;
  z-index: 401;
  overflow-y: auto;
  overflow-x: hidden;
  border-radius: 0 var(--radius) var(--radius) 0 !important;
  opacity: 1 !important;
  pointer-events: auto !important;
}
.sidebar-overlay-header {
  position: sticky;
  top: 0;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.75rem;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  font-size: 0.7rem;
  font-family: var(--font-heading);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.sidebar-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  z-index: 400;
  cursor: pointer;
}

.concept-index-pane {
  position: sticky; top: 5.4rem;
  height: calc(100vh - 6.4rem);
  max-height: calc(100vh - 6.4rem);
  overflow: hidden;
  display: flex; flex-direction: column;
  min-height: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, rgba(15, 20, 26, 0.94), rgba(10, 14, 18, 0.92)),
    radial-gradient(circle at 0% 0%, var(--accent-soft), transparent 18rem);
  box-shadow: 0 14px 48px rgba(35, 26, 16, 0.08);
}

/* Sidebar collapsible blocks */
.sidebar-section {
  position: relative;
  display: block;
  flex: 0 0 auto;
  min-height: 0;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  padding: 0.7rem;
  margin: 0;
}
.sidebar-section:last-child { border-bottom: 0; }
.sidebar-section > summary {
  cursor: pointer; user-select: none;
  font-family: var(--font-heading);
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--link);
  padding: 0.4rem 0.35rem;
  border-radius: 10px;
}
.sidebar-section > summary:hover { background: var(--accent-soft); }
.sidebar-section > p {
  margin: 0.25rem 0 0.55rem;
  font-size: 0.82rem;
  line-height: 1.35;
}
.sidebar-section[open] > summary { margin-bottom: 0.35rem; }
.sidebar-section:not([open]) > p,
.sidebar-section:not([open]) > .concept-index-list,
.sidebar-section:not([open]) > .narrative-list { display: none; }

/* Concept index list */
.concept-index-section[open] {
  flex: 1 1 auto;
  min-height: 8rem;
}
.concept-index-list {
  display: block;
  min-height: 0;
  max-height: calc(100vh - 28rem);
  overflow-y: auto; overflow-x: hidden;
  overscroll-behavior: contain;
  padding-right: 0.45rem;
  scrollbar-width: thin;
}
.concept-index-list::-webkit-scrollbar { width: 8px; }
.concept-index-list::-webkit-scrollbar-thumb { background: var(--line-strong); border-radius: 999px; }
.concept-index-link {
  display: block;
  padding: 0.55rem 0.65rem;
  border-radius: 12px;
  border: 1px solid transparent;
  color: #cfc6ba;
  text-decoration: none;
  font-size: 0.9rem;
  line-height: 1.25;
}
.concept-index-link:hover {
  background: var(--accent-soft);
  border-color: var(--line);
  color: var(--link-hover);
}
.concept-index-link.active {
  background: linear-gradient(90deg, var(--line-strong), var(--line));
  color: #fff7ea;
  border-color: var(--line-strong);
  box-shadow: inset 3px 0 0 var(--accent), 0 0 26px var(--accent-soft);
  font-weight: 800;
}

/* Narrative list */
.narrative-index-section[open] {
  flex: 0 0 auto;
  max-height: 18rem;
}
.narrative-list {
  display: block;
  min-height: 0;
  max-height: 12rem;
  overflow-y: auto; overflow-x: hidden;
  overscroll-behavior: contain;
  padding-right: 0.45rem;
}
.narrative-index-link {
  display: block;
  padding: 0.55rem 0.65rem;
  border-radius: 12px;
  border: 1px solid transparent;
  color: #cfc6ba;
  text-decoration: none;
  font-size: 0.9rem;
  line-height: 1.25;
}
.narrative-index-link:hover {
  background: var(--accent-soft);
  border-color: var(--line);
  color: var(--link-hover);
}
.narrative-index-link.active {
  background: linear-gradient(90deg, rgba(0, 220, 230, 0.24), var(--accent-soft));
  color: #fff7ea;
  border-color: rgba(0, 220, 230, 0.38);
  box-shadow: inset 3px 0 0 #00dce6, 0 0 26px rgba(0, 220, 230, 0.12);
}
.empty-list-note { margin: 0.4rem 0; font-size: 0.84rem; color: var(--muted); }

/* When concept list is collapsed, narratives can grow */
.concept-index-pane > .concept-index-section:not([open]) + .narrative-index-section[open] .narrative-list {
  max-height: calc(100vh - 13rem);
}
.concept-index-pane > .concept-index-section[open]:has(+ .narrative-index-section:not([open])) .concept-index-list {
  max-height: calc(100vh - 13rem);
}
@supports not selector(:has(*)) {
  .concept-index-list { max-height: calc(100vh - 22rem); }
}

/* ---------- Concept page ---------- */
.concept-page {
  display: grid;
  grid-template-columns: minmax(0, 1fr) clamp(320px, 28vw, 500px);
  gap: clamp(1rem, 2.2vw, 2.75rem);
  align-items: start;
  min-width: 0;
  padding: clamp(1.2rem, 4vw, 3rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, rgba(16, 21, 27, 0.94), rgba(10, 14, 18, 0.92)),
    radial-gradient(circle at 20% 0%, var(--accent-soft), transparent 30rem);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}
.concept-main, .concept-media { min-width: 0; }
.concept-main h1, #conceptTitle {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 3.05vw, 3.45rem);
  line-height: 1.05;
  letter-spacing: -0.045em;
  max-width: 100%;
  margin-bottom: 1rem;
  text-shadow: 0 0 34px var(--accent-soft);
}
.concept-eyebrow-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.75rem;
}
.concept-eyebrow-row .eyebrow { margin: 0; }
.concept-skin-select { display: none; }
.concept-skin-select.has-options { display: inline-block; }
.pov-switcher {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1rem;
}
.pov-btn {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  padding: 0.3rem 0.9rem;
  font: inherit;
  font-size: 0.78rem;
  cursor: pointer;
  transition: border-color 120ms, color 120ms, background 120ms;
}
.pov-btn:hover { border-color: var(--line-strong); color: var(--ink); }
.pov-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}
.description {
  font-size: clamp(1rem, 1.08vw, 1.15rem);
  line-height: 1.72;
  color: #efe8de;
}
.description p { color: #efe8de; }
.description a {
  color: var(--link);
  text-decoration-color: rgba(255, 191, 102, 0.45);
  text-shadow: 0 0 14px var(--line);
}

/* Relations */
.relations-section {
  margin-top: 2rem;
  padding-top: 1.35rem;
  border-top: 1px solid var(--accent-soft);
}
.narrative-refs-section {
  margin-top: 2rem;
  padding-top: 1.35rem;
  border-top: 1px solid var(--accent-soft);
}
.narrative-refs-section h2 {
  font-family: var(--font-heading);
  font-size: clamp(0.95rem, 1.05vw, 1.15rem);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0 0 1rem;
}
.narrative-refs-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.narrative-refs-list a {
  color: var(--accent);
  text-decoration: none;
}
.narrative-refs-list a:hover { text-decoration: underline; }

.concept-highlight {
  background: var(--line-strong);
  outline: 2px solid var(--accent-glow);
  border-radius: 3px;
  padding: 0 2px;
}
.relations-section h2,
.concept-media h2,
.snapshot-tools h2 {
  font-family: var(--font-heading);
  font-size: clamp(0.95rem, 1.05vw, 1.15rem);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.relations-list { display: grid; gap: 0.85rem; }
.relation-card {
  position: relative; overflow: hidden;
  padding: 1rem 1rem 1rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel-2);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.035);
}
.relation-card:hover { border-color: var(--line-strong); }
.relation-card::before {
  content: "";
  position: absolute;
  left: 0; top: 0.85rem; bottom: 0.85rem;
  width: 3px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--accent), var(--line));
}
.relation-summary {
  margin-bottom: 0.45rem;
  font-size: clamp(0.98rem, 0.98vw, 1.08rem);
  line-height: 1.35;
  color: #f3ece1;
}
.relation-summary a {
  color: var(--link);
  font-weight: 800;
}
.relation-summary .relation-name,
.relation-card .relation-name {
  color: var(--accent);
  font-weight: 800;
}
.relation-card p { margin: 0.45rem 0 0; font-size: clamp(0.92rem, 0.95vw, 1rem); }

/* ---------- Concept media / gallery ---------- */
.concept-media { display: grid; gap: 1rem; align-content: start; }

.gallery {
  display: grid;
  gap: 0.75rem;
}
.gallery-empty {
  min-height: 180px;
  border: 1px dashed var(--line);
  border-radius: 22px;
  background:
    linear-gradient(135deg, var(--accent-soft), rgba(255, 255, 255, 0.015)),
    rgba(12, 16, 20, 0.58);
}
.gallery-main {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(12, 16, 20, 0.88);
  box-shadow: 0 16px 54px rgba(0, 0, 0, 0.42);
  overflow: hidden;
}
.gallery-figure {
  margin: 0;
  display: grid;
  grid-template-rows: 1fr auto;
  outline: none;
}
.gallery-figure:focus-visible {
  box-shadow: inset 0 0 0 2px var(--accent-glow);
}
.gallery-image {
  display: block;
  width: 100%;
  max-height: min(58vh, 620px);
  aspect-ratio: 1 / 1;
  object-fit: cover;
  background: rgba(18, 23, 29, 0.9);
  grid-row: 1 / 2;
  grid-column: 1 / 2;
}
.gallery-image[hidden] { display: none; }
.gallery-image-broken {
  background:
    repeating-linear-gradient(45deg, var(--accent-soft) 0 8px, transparent 8px 16px),
    rgba(12, 16, 20, 0.7);
  min-height: 220px;
  object-fit: contain;
}

/* ── Video and HTML embed slots ── */
.gallery-slot--video,
.gallery-slot--html {
  display: block;
  position: relative;
  width: 100%;
  background: #080b0e;
  grid-row: 1 / 2;
  grid-column: 1 / 2;
  /* aspect-ratio is set inline from the XLSX aspectRatio column */
}
.gallery-slot--video[hidden],
.gallery-slot--html[hidden] { display: none; }

.gallery-slot--video video,
.gallery-slot--video iframe,
.gallery-slot--html  iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

/* Native video controls baseline */
.gallery-slot--video video {
  background: #000;
  object-fit: contain;
}

/* Thumbnail placeholder for non-image items */
.gallery-thumb-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  font-size: 1.3rem;
  color: var(--accent);
  background: rgba(18, 23, 29, 0.88);
  letter-spacing: 0.04em;
  user-select: none;
}
.gallery-caption {
  display: grid;
  gap: 0.35rem;
  padding: 0.9rem 1rem;
  background: rgba(9, 13, 17, 0.78);
  border-top: 1px solid var(--line);
  color: var(--muted-2);
  line-height: 1.45;
  grid-row: 2 / 3;
}
.gallery-counter {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}
.gallery-counter:empty { display: none; }
.gallery-source-title {
  text-transform: uppercase;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--ink-strong);
}
.gallery-source-title:empty { display: none; }
.gallery-caption-text:empty { display: none; }
.gallery-source-link[hidden] { display: none; }
.gallery-source-link {
  justify-self: start;
  color: var(--link);
  font-weight: 800;
}
.gallery-source-link:hover { color: var(--link-hover); }

.gallery-thumbs {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.gallery-thumb {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(12, 16, 20, 0.88);
  padding: 0;
  cursor: pointer;
  overflow: hidden;
  width: 64px;
  height: 64px;
  transition: border-color 120ms ease, transform 120ms ease;
}
.gallery-thumb img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.gallery-thumb:hover { border-color: var(--line-strong); }
.gallery-thumb.is-active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--line-strong), 0 0 22px var(--line);
}
.gallery-thumb:focus-visible {
  outline: none;
  border-color: var(--accent);
}

.narrative-element-gallery {
  margin: 0.5rem 0 1.5rem;
  max-width: 800px;
}
.narrative-element-gallery .gallery-image {
  aspect-ratio: 16 / 9;
  max-height: 520px;
  object-fit: cover;
}

/* Narrative start cover (single hard-coded image for now) */
.narrative-image-card {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(12, 16, 20, 0.88);
  box-shadow: 0 16px 54px rgba(0, 0, 0, 0.42);
}
.narrative-image-card img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  max-height: 520px;
  object-fit: cover;
  background: rgba(18, 23, 29, 0.9);
}
.narrative-image-card figcaption {
  display: grid;
  gap: 0.4rem;
  padding: 1rem;
  background: rgba(9, 13, 17, 0.78);
  border-top: 1px solid var(--line);
  color: var(--muted-2);
}
.narrative-image-card figcaption strong {
  text-transform: uppercase;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--ink-strong);
}

/* ---------- Dialogs ---------- */
.dialog {
  width: min(720px, calc(100vw - 2rem));
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--paper);
  color: var(--ink);
  box-shadow: var(--shadow);
  padding: 0;
}
.dialog::backdrop { background: rgba(0, 0, 0, 0.64); }
.dialog form { padding: 1.2rem; }
.dialog-header, .dialog-actions {
  display: flex; gap: 1rem; align-items: center;
  justify-content: space-between;
}
.help-dialog, .narrative-import-dialog { width: min(780px, calc(100vw - 2rem)); }
.history-list {
  display: grid; gap: 0.65rem;
  max-height: 50vh; overflow: auto;
  margin: 1rem 0;
}
.history-item {
  display: flex; gap: 1rem;
  justify-content: space-between;
  padding: 0.8rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel-2);
}

/* ---------- Help dialog content ---------- */
.help-content { display: grid; gap: 1rem; margin: 1rem 0; }
.help-section {
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel-2);
}
.help-section h3 { margin: 0 0 0.5rem; font-size: 1.05rem; }
.help-section ul { margin: 0.4rem 0 0 1.25rem; padding: 0; }

/* ---------- Narrative pages ---------- */
.narrative-start-page,
.narrative-element-page { min-height: 68vh; }
.narrative-summary,
.narrative-element-content { max-width: 84ch; }
.narrative-image-card img { aspect-ratio: 16 / 9; max-height: 520px; object-fit: cover; }
.narrative-start-action { margin-top: 1.5rem; }
.narrative-element-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 3.05vw, 3.45rem);
  line-height: 1.05;
  letter-spacing: -0.045em;
  max-width: 100%;
  margin: 0 0 1.2rem;
  color: var(--ink-strong);
  text-shadow: 0 0 34px var(--accent-soft);
}
.narrative-element-content a,
.narrative-summary a {
  color: var(--link);
  text-decoration-color: rgba(255, 191, 102, 0.45);
  text-underline-offset: 0.18em;
}
.narrative-element-content a:hover,
.narrative-summary a:hover { color: var(--link-hover); }

.element-nav {
  display: flex; gap: 1rem;
  justify-content: space-between; align-items: center;
  margin-bottom: 1.3rem;
  padding: 0.8rem 1rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel-2);
}
.element-nav-title {
  min-width: 0;
  color: var(--ink-strong);
  font-family: var(--font-heading);
  font-weight: 800;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.element-nav-actions { display: flex; gap: 0.55rem; flex: 0 0 auto; }
.element-nav-button { min-width: 7.2rem; text-align: center; }
.element-nav-button.disabled { opacity: 0.38; pointer-events: none; filter: grayscale(0.4); }

/* ---------- Tooltips ---------- */
[data-tooltip] { position: relative; }
[data-tooltip]:hover::after,
[data-tooltip]:focus-visible::after {
  content: attr(data-tooltip);
  position: absolute; z-index: 9999;
  left: 50%; top: calc(100% + 0.55rem);
  transform: translateX(-50%);
  width: max-content;
  max-width: min(24rem, 80vw);
  padding: 0.55rem 0.7rem;
  border-radius: 12px;
  background: rgba(18, 13, 8, 0.98);
  color: #ffe9c4;
  border: 1px solid var(--line-strong);
  font-size: 0.78rem; line-height: 1.35; font-weight: 600;
  text-align: left;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.38), 0 0 26px var(--accent-soft);
  pointer-events: none;
  white-space: normal;
}
[data-tooltip]:hover::before,
[data-tooltip]:focus-visible::before {
  content: "";
  position: absolute; z-index: 9999;
  left: 50%; top: calc(100% + 0.25rem);
  transform: translateX(-50%);
  border: 0.35rem solid transparent;
  border-bottom-color: rgba(18, 13, 8, 0.98);
  pointer-events: none;
}

/* ---------- Responsive ---------- */
@media (min-width: 1600px) {
  :root { --max: min(100%, 1920px); }
  .concept-shell {
    grid-template-columns: clamp(280px, 17vw, 380px) minmax(0, 1fr);
    gap: clamp(1.5rem, 2.2vw, 3rem);
  }
  .concept-page {
    grid-template-columns: minmax(0, 1fr) clamp(420px, 28vw, 600px);
    gap: clamp(1.75rem, 2.4vw, 3.5rem);
  }
  .concept-main h1, #conceptTitle { font-size: clamp(2.25rem, 2.45vw, 3.75rem); }
  .description { max-width: 78ch; }
  .relations-list { grid-template-columns: repeat(2, minmax(280px, 1fr)); }
}

@media (min-width: 1060px) and (max-width: 1599px) {
  .concept-page { grid-template-columns: minmax(0, 1fr) clamp(300px, 30vw, 460px); }
}

@media (max-width: 1059px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 1.6rem;
  }
  .hero-diagram-frame { order: -1; }
}

@media (min-width: 721px) and (max-width: 1059px) {
  .concept-shell { grid-template-columns: clamp(210px, 28vw, 280px) minmax(0, 1fr); }
  .concept-page { grid-template-columns: 1fr; }
  .concept-main h1, #conceptTitle { font-size: clamp(1.9rem, 4vw, 2.8rem); }
  .snapshot-card img { max-height: 420px; }
}

@media (max-width: 720px) {
  .topbar {
    align-items: stretch;
    flex-direction: column;
    gap: 0.6rem;
  }
  .nav { width: 100%; flex-wrap: wrap; }
  .nav-link, .nav-button { flex: 1 1 auto; text-align: center; }
  .nav-context { width: 100%; border-radius: 18px; }
  .brand-logo { width: 9rem; height: 2.55rem; }

  .hero-card { padding: clamp(1rem, 5vw, 1.6rem); }
  .hero-card h1 { font-size: clamp(2.2rem, 9vw, 3.2rem); max-width: 100%; }
  .hero-lede { font-size: 1rem; }

  .concept-shell { grid-template-columns: 1fr; }
  .concept-index-pane {
    position: relative; top: auto;
    height: auto; max-height: min(55vh, 440px);
    overflow: visible;
  }
  .concept-index-list, .narrative-list { max-height: 18rem; }
  .concept-index-pane > .narrative-index-section[open] { max-height: none; }

  .concept-page { grid-template-columns: 1fr; padding: clamp(1rem, 4vw, 1.4rem); }
  .concept-main h1, #conceptTitle { font-size: clamp(1.75rem, 8vw, 2.35rem); line-height: 1.08; }
  .description { font-size: 1rem; }
  .snapshot-card img { max-height: 360px; }

  .element-nav { align-items: stretch; flex-direction: column; }
  .element-nav-actions { width: 100%; }
  .element-nav-button { flex: 1 1 50%; min-width: 0; }

  .narrative-element-title { font-size: clamp(1.75rem, 8vw, 2.35rem); line-height: 1.08; }
}

/* ---------- Skin switcher (chip group) ---------- */
.skin-switcher {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding: 0.35rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel-3);
}
.skin-switcher-static { margin: 0 0 1.2rem; }
.skin-switcher-floating {
  background: rgba(10, 14, 22, 0.78);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-color: rgba(255, 255, 255, 0.12);
}
.skin-switcher-label {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.65rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 0 0.4rem;
}
.skin-chip {
  display: inline-flex;
  align-items: center;
  padding: 0.32rem 0.85rem;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted-2);
  text-decoration: none;
  border: 1px solid transparent;
  transition: color 120ms ease, background 120ms ease, border-color 120ms ease;
}
.skin-chip:hover { color: var(--ink-strong); background: var(--accent-soft); }
.skin-chip.is-active {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: var(--line-strong);
  cursor: default;
}
.skin-default-marker { margin-left: 0.35rem; color: var(--accent); }

/* Skin styles are loaded dynamically from skins/<id>/<id>.css
   when each skin is first activated (see js/skin/loader.js). */

/* =============================================================
   Narrative PiP Overlay
   States managed by JS via class: is-full · is-pip · (default hidden)
============================================================= */

/* Base — hidden (slides below viewport, same geometry as pip) */
.n-overlay {
  position: fixed; top: 0; left: 0; z-index: 200;
  overflow: hidden;
  background: #060d16;
  width: 334px; height: 210px;
  transform: translate(calc(100vw - 334px - 22px), calc(100vh + 60px));
  border-radius: 0; opacity: 0; pointer-events: none; box-shadow: none;
  transition:
    width  .44s cubic-bezier(.4,0,.2,1),
    height .44s cubic-bezier(.4,0,.2,1),
    transform .44s cubic-bezier(.4,0,.2,1),
    border-radius .44s cubic-bezier(.4,0,.2,1),
    box-shadow .44s cubic-bezier(.4,0,.2,1),
    opacity .28s ease;
}

/* PiP state */
.n-overlay.is-pip {
  width: 334px; height: 210px;
  transform: translate(calc(100vw - 334px - 22px), calc(100vh - 210px - 22px));
  border-radius: var(--radius-sm);
  opacity: 1; pointer-events: auto;
  box-shadow: 0 28px 70px rgba(0,0,0,.65), 0 0 0 1px var(--line-strong);
}

/* Full state */
.n-overlay.is-full {
  width: 100vw; height: 100dvh;
  transform: translate(0, 0);
  border-radius: 0; opacity: 1; pointer-events: auto; box-shadow: none;
}

/* Inner scroller */
.n-scroller {
  position: absolute; inset: 0;
  overflow-y: auto; overflow-x: hidden; overscroll-behavior: contain;
}
.n-overlay.is-pip .n-scroller,
.n-overlay:not(.is-pip):not(.is-full) .n-scroller { overflow: hidden; pointer-events: none; }

/* Overlay topbar */
.n-bar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: .6rem;
  padding: .55rem 1.25rem;
  background: rgba(6,13,22,.9); border-bottom: 1px solid var(--accent-soft);
  backdrop-filter: blur(16px);
  transition: opacity .22s ease;
}
.n-overlay.is-pip .n-bar { opacity: 0; pointer-events: none; }

.n-bar-back { border-radius: 999px !important; font-size: .78rem !important; padding: .35rem .8rem !important; flex: 0 0 auto; }
.n-bar-title {
  flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  font-family: var(--font-heading); font-size: .78rem; font-weight: 600;
  color: var(--accent); letter-spacing: -.01em;
}
.n-prog-wrap { flex: 0 0 80px; height: 2px; background: rgba(255,255,255,.08); border-radius: 1px; }
.n-prog-bar  { height: 100%; background: var(--accent); border-radius: 1px; transition: width .25s; }
.n-bar-counter { font-size: .68rem; color: var(--muted); font-family: "IBM Plex Mono",ui-monospace,monospace; white-space: nowrap; }

/* Skin switcher */
.n-skin-switch {
  display: flex; gap: 2px;
  background: rgba(255,255,255,.06); border: 1px solid var(--line);
  border-radius: 999px; padding: 3px; flex: 0 0 auto;
}
.n-skin-btn {
  border: none; border-radius: 999px;
  background: transparent; color: var(--muted);
  padding: .22rem .7rem; font: inherit; font-size: .7rem;
  cursor: pointer; transition: background .18s, color .18s; white-space: nowrap;
}
.n-skin-btn.active { background: var(--accent); color: var(--accent-fg); font-weight: 700; }
.n-skin-btn:not(.active):hover { color: var(--ink); background: rgba(255,255,255,.08); }

/* PiP thumbnail card */
.n-pip-card {
  position: absolute; inset: 0; z-index: 15;
  display: flex; flex-direction: column;
  padding: .72rem .88rem .78rem;
  background: linear-gradient(168deg, rgba(6,13,22,.2) 0%, rgba(6,13,22,.72) 48%, rgba(6,13,22,.96) 100%);
  opacity: 0; pointer-events: none; cursor: pointer;
  transition: opacity .24s ease .16s;
}
.n-overlay.is-pip .n-pip-card { opacity: 1; pointer-events: auto; }

.n-pip-top { display: flex; justify-content: space-between; align-items: flex-start; }
.n-pip-eyebrow { font-size: .57rem; text-transform: uppercase; letter-spacing: .16em; color: var(--accent); font-weight: 600; }
.n-pip-mode-tag {
  font-size: .54rem; background: var(--line); border: 1px solid var(--line-strong);
  border-radius: 4px; padding: .08rem .3rem; color: var(--accent);
  letter-spacing: .06em; text-transform: uppercase; margin-left: .35rem;
}
.n-pip-x {
  width: 1.35rem; height: 1.35rem; border: none;
  background: rgba(255,255,255,.1); border-radius: 50%;
  color: var(--ink); font-size: .7rem; cursor: pointer; line-height: 1;
  display: flex; align-items: center; justify-content: center;
  transition: background .15s;
}
.n-pip-x:hover { background: rgba(255,255,255,.22); }

.n-pip-body { flex: 1; display: flex; flex-direction: column; justify-content: flex-end; gap: .28rem; }
.n-pip-title {
  font-family: var(--font-heading); font-size: .78rem; font-weight: 700;
  color: var(--ink-strong); line-height: 1.2;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
  margin: 0;
}
.n-pip-chap { font-size: .64rem; color: var(--muted); font-family: "IBM Plex Mono",ui-monospace,monospace; margin: 0; }
.n-pip-prog { height: 2px; background: rgba(255,255,255,.1); border-radius: 1px; overflow: hidden; margin: .08rem 0 .42rem; }
.n-pip-prog-fill { height: 100%; background: var(--accent); border-radius: 1px; transition: width .3s; }
.n-pip-resume {
  width: 100%; padding: .4rem 0; border: none; border-radius: 6px;
  background: var(--accent); color: var(--accent-fg);
  font: inherit; font-size: .73rem; font-weight: 700;
  cursor: pointer; letter-spacing: .02em;
  transition: background .15s, transform .1s;
}
.n-pip-resume:hover { background: var(--link-hover); transform: translateY(-1px); }

/* Suspended badge */
.n-suspended-badge {
  position: absolute; top: -7px; right: -7px; z-index: 30;
  background: var(--accent); color: var(--accent-fg);
  font-size: .55rem; font-weight: 800; letter-spacing: .06em;
  text-transform: uppercase; padding: .13rem .36rem; border-radius: 20px;
  opacity: 0; transform: scale(.6);
  transition: opacity .2s ease .38s, transform .2s ease .38s; pointer-events: none;
}
.n-overlay.is-pip .n-suspended-badge { opacity: 1; transform: scale(1); }

/* Drag handle */
.n-drag { position: absolute; top: 0; left: 0; right: 0; height: 26px; z-index: 25; cursor: grab; }
.n-overlay.is-full .n-drag { pointer-events: none; }
.n-drag:active { cursor: grabbing; }

/* ---- App sidebar flash (triggered by linear "Fim" button) ---- */
@keyframes app-sidebar-flash {
  0%   { box-shadow: inset 0 0 0 0   rgba(201, 169, 97, 0.8); }
  40%  { box-shadow: inset 0 0 0 8px rgba(201, 169, 97, 0.35); }
  100% { box-shadow: inset 0 0 0 0   rgba(201, 169, 97, 0);   }
}
.app-sidebar-flash {
  animation: app-sidebar-flash 0.9s ease-out forwards;
}

/* ═══════════════════════════════════════════════════════════════
   Exploration graph panel  (js/explore-graph.js)
═══════════════════════════════════════════════════════════════ */

.eg-panel {
  position: fixed;
  bottom: 1.4rem;
  right:  1.4rem;
  z-index: 1100;
  /* 40% of content area (viewport minus sidebar clamp) × 5:8 aspect ratio */
  width:  calc(0.4 * (100vw - clamp(230px, 18vw, 340px)));
  height: calc(0.25 * (100vw - clamp(230px, 18vw, 340px)));
  min-width:  320px;
  min-height: 200px;
  display: flex;
  flex-direction: column;
  background: rgba(6, 13, 22, 0.92);
  border: 1px solid rgba(68, 136, 255, 0.45);
  border-radius: var(--radius-sm);
  backdrop-filter: blur(8px);
  box-shadow: 0 6px 28px rgba(0,0,0,.55);
  overflow: hidden;
  transition: width .22s ease, height .22s ease, opacity .18s;
}

.eg-panel.eg-hidden { opacity: 0; pointer-events: none; }

/* Suppress transition during live resize drag */
.eg-panel.eg-resizing { transition: opacity .18s; }

/* Expanded (full) view */
.eg-panel.eg-large {
  width:  90vw;
  height: 90vh;
}

/* ── Title bar ── */
.eg-bar {
  display: flex;
  align-items: center;
  gap: .5rem;
  padding: .32rem .5rem .32rem .72rem;
  background: rgba(255,255,255,.04);
  border-bottom: 1px solid var(--line);
  cursor: grab;
  user-select: none;
  flex: 0 0 auto;
}
.eg-bar:active { cursor: grabbing; }

.eg-bar-title {
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--accent);
  flex: 1;
}

.eg-count {
  font-size: .63rem;
  color: var(--muted);
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  white-space: nowrap;
}

.eg-btn {
  border: none;
  background: rgba(255,255,255,.07);
  color: var(--ink);
  border-radius: 4px;
  width: 1.55rem;
  height: 1.55rem;
  font-size: .8rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  transition: background .14s;
}
.eg-btn:hover { background: rgba(255,255,255,.16); }

/* ── SVG body ── */
.eg-body {
  flex: 1;
  overflow: hidden;
  position: relative;
}

.eg-svg {
  display: block;
  width: 100%;
  height: 100%;
}

/* ── Edges ── */
.eg-nav-edge {
  stroke: rgba(68, 136, 255, 0.65);
  stroke-width: 1.5;
}

.eg-cross-edge {
  stroke: rgba(68, 136, 255, 0.45);
  stroke-width: 1.5;
}

/* .eg-suggested-edge removed — all non-nav edges use .eg-cross-edge */

.eg-edge-label {
  font-family: var(--font-body);
  font-size: 10px;
  font-style: italic;
  fill: rgba(68, 136, 255, 0.88);
  pointer-events: none;
  /* Dark halo keeps text readable over nodes and background */
  paint-order: stroke fill;
  stroke: rgba(6, 13, 22, 0.85);
  stroke-width: 3.5px;
  stroke-linejoin: round;
}

/* ── Nodes ── */
.eg-node-g { cursor: pointer; }

/* Visited (navigated) nodes — dark blue tint */
.eg-box {
  fill: rgba(20, 35, 65, 0.94);
  stroke: rgba(68, 136, 255, 0.38);
  stroke-width: 1.2;
  transition: fill .15s, stroke .15s;
}

.eg-node-g:hover .eg-box {
  fill: rgba(68, 136, 255, 0.14);
  stroke: var(--accent);
}

.eg-label {
  font-family: var(--font-body);
  font-size: 14px;
  fill: var(--muted-2);
  pointer-events: none;
}

.eg-node-g:hover .eg-label { fill: var(--ink); }

/* ── Unvisited (teal) nodes — bright teal, full brightness ── */
.eg-suggested .eg-box {
  fill: rgba(4, 58, 70, 0.94);
  stroke: rgba(0, 210, 190, 0.58);
  stroke-width: 1.2;
}
.eg-suggested .eg-label { fill: rgba(0, 220, 200, 0.92); }
.eg-suggested:hover .eg-box {
  fill: rgba(0, 210, 190, 0.18);
  stroke: rgba(0, 225, 205, 0.90);
}
.eg-suggested:hover .eg-label { fill: #fff; }

/* ── Current node ── */
.eg-current .eg-box {
  fill: rgba(68, 136, 255, 0.18);
  stroke: var(--accent);
  stroke-width: 2;
}
.eg-current .eg-label { fill: var(--ink-strong); font-weight: 600; }

/* ── Expanded (visited node with open connections) ── */
.eg-expanded .eg-box {
  stroke: var(--accent);
  stroke-width: 2;
}

/* ── External-ref nodes and edges ── */
.eg-ext-edge {
  stroke: var(--ext-ref, #b87fff);
  stroke-width: 1.5;
  stroke-dasharray: 8 5;
  opacity: 0.75;
}

.eg-ext .eg-box {
  fill: rgba(184, 127, 255, 0.10);
  stroke: var(--ext-ref, #b87fff);
  stroke-width: 2;
  stroke-dasharray: 6 4;
}

.eg-ext .eg-label { fill: var(--ext-ref, #b87fff); }

.eg-ext:hover .eg-box {
  fill: rgba(184, 127, 255, 0.22);
  stroke: var(--ext-ref, #b87fff);
}

.eg-ext:hover .eg-label { fill: #fff; }

/* ── Minimized state: title bar only ── */
.eg-minimized .eg-body,
.eg-minimized .eg-resize-handle { display: none; }
.eg-minimized { min-height: 0; height: auto !important; }

/* ── Resize handle ── */
.eg-resize-handle {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 18px;
  height: 18px;
  cursor: nwse-resize;
  z-index: 10;
  opacity: 0.70;
  background:
    linear-gradient(135deg,
      transparent 30%,
      rgba(180,210,255,0.85) 30%, rgba(180,210,255,0.85) 40%,
      transparent 40%,
      transparent 55%,
      rgba(180,210,255,0.85) 55%, rgba(180,210,255,0.85) 65%,
      transparent 65%,
      transparent 80%,
      rgba(180,210,255,0.85) 80%, rgba(180,210,255,0.85) 90%,
      transparent 90%
    );
  transition: opacity .15s;
  border-radius: 0 0 8px 0;
}
.eg-resize-handle:hover { opacity: 1.0; }

/* ── New edge draw-on animation ── */
@keyframes eg-draw {
  from { stroke-dashoffset: var(--eg-el, 500); }
  to   { stroke-dashoffset: 0; }
}

.eg-new-edge {
  animation: eg-draw 0.42s ease-out both;
}

/* ── New label fade-in ── */
@keyframes eg-fade-label {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.eg-new-label {
  animation: eg-fade-label 0.28s ease both;
}

/* ── New node entrance (pop-in with overshoot) ── */
@keyframes eg-pop-in {
  from { opacity: 0; transform: scale(0.55); }
  to   { opacity: 1; transform: scale(1); }
}

.eg-new {
  transform-box: fill-box;
  transform-origin: center center;
  animation: eg-pop-in .32s cubic-bezier(.34, 1.56, .64, 1) both;
}