/**
 * SOL Grid Builder – 2D Lernpfad-Designer
 * Uses design tokens from style.css :root (4px grid)
 * Track colors: A=success, B=warning, C=error, ALL=brand
 */

/* ==================== LAYOUT WRAPPER ==================== */

.sol-grid-layout {
  /* Flexbox statt CSS Grid: verhaltenssicherer als CSS-Grids
     align-content/align-self-Stretch-Semantik (Sonderfall in dieser Kette),
     nutzt denselben, bereits an jeder anderen Stelle dieser Höhen-Kette
     bewährten Flex-Stretch-Mechanismus (.grid/.card/.sol-tab-panel etc.). */
  display: flex;
  flex-direction: row;
  gap: 0;
  flex: 1;
  min-height: 0;
  position: relative;

  /* Track-Farben (scoped, kein :root Override) */
  --track-a: #10b981;
  --track-a-light: #6ee7b7;
  --track-a-glow: rgba(16, 185, 129, 0.25);
  --track-b: #f59e0b;
  --track-b-light: #fcd34d;
  --track-b-glow: rgba(245, 158, 11, 0.25);
  --track-c: #ef4444;
  --track-c-light: #fca5a5;
  --track-c-glow: rgba(239, 68, 68, 0.25);
  --track-all: var(--brand);
  --track-all-glow: rgba(59, 130, 246, 0.3);
}

@media (min-width: 1280px) {
  .sol-grid-layout.has-inspector .sol-inspector {
    flex: 0 0 340px;
    min-width: 340px;
  }
}

/* ==================== EDITOR-CHROME AUSBLENDEN ====================
   Klassen-Manager-Chrome (Klassenname/Zurück, Schüler-/Einheiten-Zähler,
   Schüler/SOL-Einheiten/Datenschutz-Tabbar) ist irrelevant, sobald man tief
   im Stage-Editor einer einzelnen Einheit ist — kostet aber mehrere Zeilen
   Höhe. Gilt für BEIDE Views (Grid + Outline), Klasse "sol-editor-active"
   wird von sol-unit-builder.js auf #view_classes gesetzt/entfernt. */
#view_classes.sol-editor-active .sol-detail-header,
#view_classes.sol-editor-active .sol-stats-strip,
#view_classes.sol-editor-active .sol-tabs {
  display: none;
}

/* ==================== HÖHEN-SCAFFOLD (nur Grid) ====================
   Begrenzt den Scroll-Bereich auf .sol-grid-viewport statt die ganze Seite
   (.main) wachsen zu lassen — sinnvoll für die 2D-Grid-Ansicht (braucht
   eine eigene, zoombare Box). Die Outline (lineare Liste) will das NICHT:
   dort soll .main ganz normal die Seite scrollen, ohne zweite kleine
   Scrollbox. Deshalb eigene Modifier-Klasse "sol-editor-active--bounded",
   die nur renderStationGrid() setzt (renderStationOutline() entfernt sie
   explizit). .card/.grid/.sol-tab-panel werden app-weit wiederverwendet,
   daher gescoped, nicht global geändert. Höhe kommt über height:100% der
   Kette bis zu .main (bereits über CSS-Grid-Tracksizing begrenzt) – keine
   geschätzten calc(100vh - Xpx)-Werte nötig. */
#view_classes.sol-editor-active--bounded {
  height: 100%;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

#view_classes.sol-editor-active--bounded .grid {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

#view_classes.sol-editor-active--bounded .card {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

#view_classes.sol-editor-active--bounded #sol-classes-root,
#view_classes.sol-editor-active--bounded #solTabContent,
#view_classes.sol-editor-active--bounded .sol-tab-panel {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

/* ==================== GRID VIEWPORT + CANVAS ==================== */

.sol-grid-viewport {
  overflow: auto;
  -webkit-overflow-scrolling: touch; /* iOS Safari: Touch-Momentum-Scroll */
  touch-action: pan-x pan-y;         /* iOS: 1-Finger-Wischen = Scroll (kein Warten auf JS) */
  overscroll-behavior: contain;      /* Verhindert Body-Scroll wenn Grid-Rand erreicht */
  position: relative;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.2) transparent;
  padding-bottom: 40px; /* Platz fuer FAB, das jetzt transparent darueber schwebt */
  background-image: radial-gradient(circle, rgba(99, 102, 241, 0.08) 1px, transparent 1px);
  background-size: 28px 28px;
  /* .sol-grid-layout ist jetzt Flexbox (Row) — flex:1 nimmt die volle
     verfuegbare Hoehe UND Breite (abzueglich .sol-inspector, falls offen).
     min-width:0 ist noetig, damit die Box trotz breitem Grid-Inhalt
     (.sol-grid-canvas hat min-width:max-content) korrekt schrumpft statt
     den Container aufzublaehen. */
  flex: 1;
  min-width: 0;
}

.sol-grid-viewport::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

.sol-grid-viewport::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.2);
  border-radius: 4px;
}

.sol-grid-canvas {
  transform: scale(var(--sol-zoom, 1));
  transform-origin: 0 0;
  transition: transform 150ms ease;
  padding: var(--space-3);
  min-width: max-content;
}

/* ==================== CSS GRID ==================== */

.sol-grid {
  display: grid;
  grid-template-columns: 104px repeat(var(--sol-stages, 3), minmax(150px, 1fr));
  grid-template-rows: 36px repeat(3, minmax(60px, auto));
  gap: var(--space-1);
  /* Containing Block fuer .sol-grid-plenum-ghost (position:absolute) – muss
     .sol-grid selbst sein (nicht .sol-grid-canvas, das transform:scale() hat),
     sonst gehen die grid-column/row-Koordinaten als Positionsreferenz verloren. */
  position: relative;
}

/* ==================== STAGE HEADERS ==================== */

.sol-grid-stage-header {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.02);
}

.sol-grid-stage-header span {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  position: relative;
  z-index: 1;
}

/* Dekorative Stage-Nummer als Hintergrund */
.sol-grid-stage-header::after {
  content: attr(data-stage-nr);
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 3rem;
  font-weight: 900;
  font-family: 'Space Grotesk', sans-serif;
  color: rgba(255, 255, 255, 0.06);
  line-height: 1;
  pointer-events: none;
  user-select: none;
}

/* Corner cell (top-left) */
.sol-grid-corner {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Add-stage column header */
.sol-grid-add-stage {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ==================== TRACK LABELS ==================== */

.sol-grid-track-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-2);
  border-radius: var(--radius-sm);
  writing-mode: horizontal-tb;
}

.sol-grid-track-label-text {
  font-size: var(--fs-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

.sol-grid-track-label--a {
  border-left: 3px solid var(--track-a);
  background: rgba(16, 185, 129, 0.05);
}
.sol-grid-track-label--a .sol-grid-track-label-text { color: var(--track-a-light); }

.sol-grid-track-label--b {
  border-left: 3px solid var(--track-b);
  background: rgba(245, 158, 11, 0.05);
}
.sol-grid-track-label--b .sol-grid-track-label-text { color: var(--track-b-light); }

.sol-grid-track-label--c {
  border-left: 3px solid var(--track-c);
  background: rgba(239, 68, 68, 0.05);
}
.sol-grid-track-label--c .sol-grid-track-label-text { color: var(--track-c-light); }

/* Track-Zellenhintergründe – gleiche Intensität wie Track-Label */
.sol-grid-cell--a { background: rgba(16, 185, 129, 0.05); }
.sol-grid-cell--b { background: rgba(245, 158, 11, 0.05); }
.sol-grid-cell--c { background: rgba(239, 68, 68, 0.05); }

/* ==================== GRID CELLS ==================== */

.sol-grid-cell {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-1);
  border-radius: var(--radius-sm);
  min-height: 60px;
  background: rgba(255, 255, 255, 0.01);
}

/* ALL-Zelle: spannt ueber alle 3 Tracks */
.sol-grid-cell--all {
  grid-row: span 3;
}

.sol-grid-cell--all .sol-grid-card--all {
  flex: 1;
  justify-content: center;
  align-items: center;
  text-align: center;
  min-height: 100%;
  background: linear-gradient(
    180deg,
    rgba(16, 185, 129, 0.04) 0%,
    rgba(59, 130, 246, 0.06) 33%,
    rgba(245, 158, 11, 0.04) 66%,
    rgba(239, 68, 68, 0.04) 100%
  );
}

.sol-grid-cell--all .sol-grid-card--all .sol-grid-card-header {
  justify-content: center;
}

.sol-grid-cell--all .sol-grid-card--all .sol-grid-card-badge {
  font-size: var(--fs-sm);
  letter-spacing: 0.12em;
}

.sol-grid-cell--all .sol-grid-card--all .sol-grid-card-title {
  font-size: var(--fs-lg);
  -webkit-line-clamp: 4;
}

.sol-grid-cell--all .sol-grid-card--all .sol-grid-card-footer {
  justify-content: center;
}

/* ==================== STATION CARDS ==================== */

.sol-grid-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-3);
  padding-left: calc(var(--space-3) + 3px);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  min-height: 52px;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.sol-grid-card:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
  transform: translateY(-2px);
}

/* Track-Farblinien links */
.sol-grid-card--track-a {
  border-left: 3px solid var(--track-a);
}
.sol-grid-card--track-a:hover {
  box-shadow: 0 0 16px var(--track-a-glow), var(--shadow-md);
}

.sol-grid-card--track-b {
  border-left: 3px solid var(--track-b);
}
.sol-grid-card--track-b:hover {
  box-shadow: 0 0 16px var(--track-b-glow), var(--shadow-md);
}

.sol-grid-card--track-c {
  border-left: 3px solid var(--track-c);
}
.sol-grid-card--track-c:hover {
  box-shadow: 0 0 16px var(--track-c-glow), var(--shadow-md);
}

/* Typografischer Kontrast: Card-Badge mit Track-Farbe */
.sol-grid-card--track-a .sol-grid-card-badge { color: var(--track-a-light); }
.sol-grid-card--track-b .sol-grid-card-badge { color: var(--track-b-light); }
.sol-grid-card--track-c .sol-grid-card-badge { color: var(--track-c-light); }
.sol-grid-card--all .sol-grid-card-badge { color: var(--brand-light, #93c5fd); }

/* ALL-Karten: Spanning + Gradient-Border */
.sol-grid-card--all {
  border-left: 3px solid var(--track-all);
}
.sol-grid-card--all:hover {
  box-shadow: 0 0 20px var(--track-all-glow), var(--shadow-md);
}
.sol-grid-card--all::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.4), rgba(99, 102, 241, 0.2), rgba(255, 255, 255, 0.03));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

/* Card selected state */
.sol-grid-card.selected {
  border-color: var(--brand);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.3), var(--shadow-md);
}

/* Card header row */
.sol-grid-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

.sol-grid-card-badge {
  font-size: var(--fs-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.sol-grid-card-actions {
  display: flex;
  gap: var(--space-1);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.sol-grid-card:hover .sol-grid-card-actions {
  opacity: 1;
}

/* Card title */
.sol-grid-card-title {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.4;
}

/* Card footer (media icons + substep) */
.sol-grid-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
}

.sol-grid-card-media {
  display: flex;
  gap: var(--space-1);
  font-size: var(--fs-xs);
  color: var(--muted);
}

.sol-grid-card-substep {
  font-size: var(--fs-xs);
  color: var(--muted);
  font-weight: 500;
}

/* ==================== EMPTY CELLS ==================== */

.sol-grid-cell-empty {
  border: 2px dashed var(--border-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  cursor: pointer;
  transition: all var(--transition-base);
  color: var(--muted);
  font-size: var(--fs-lg);
}

.sol-grid-cell-empty:hover {
  border-color: var(--brand);
  background: rgba(59, 130, 246, 0.06);
  color: var(--brand-light);
}

/* ==================== PLENUM GHOST (leere Stage, ALL-Vorschau) ====================
   Duenne dekorative Trennlinie ueber die volle 3-Track-Hoehe (Pattern "Trennlinie
   als Design-Element") + rundes 44x44px Gold-Badge in der Mitte als einziger
   Klick-Punkt (Touch-Target-Regel). Bricht bewusst leicht aus der Spalte aus,
   verdeckt aber die darunterliegenden A/B/C-"+"-Zellen nicht.

   WICHTIG: position:absolute (nicht nur grid-row/grid-column!) – ein rein
   explizit platziertes Grid-Item wuerde vom Placement-Algorithmus VOR allen
   auto-platzierten Track-Labels/Zellen reserviert (CSS Grid Spec §8.5,
   Kategorie-Reihenfolge ignoriert DOM-Position). Bei mehreren gleichzeitig
   leeren Stages blockierte das frueher fast das ganze Zeilenraster und riss
   Labels/Zellen in falsche Spalten/implizite Zeilen. Mit position:absolute
   wird das Ghost-Element aus dem Placement-Algorithmus komplett ausgeklammert,
   nutzt grid-column/row aber weiterhin als Positionsreferenz (Containing
   Block = .sol-grid, siehe dortiges position:relative). */
.sol-grid-plenum-ghost {
  position: absolute;
  grid-row: 2 / span 3;
  top: 0;
  bottom: 0;
  right: 4px;
  width: 2px;
  background: repeating-linear-gradient(to bottom, var(--warning-light) 0 5px, transparent 5px 10px);
  opacity: 0.5;
  pointer-events: none;
  animation: sol-plenum-ghost-fade 300ms ease-out;
}

.sol-grid-plenum-ghost-label {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1.5px dashed var(--warning-light);
  background: rgba(15, 23, 42, 0.92);
  color: var(--warning-light);
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  pointer-events: auto;
  box-shadow: 0 2px 10px rgba(251, 191, 36, 0.18);
  transition: transform 200ms cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 200ms ease, background 200ms ease;
}

.sol-grid-plenum-ghost-label:hover {
  transform: translate(-50%, -50%) scale(1.12);
  box-shadow: 0 6px 20px rgba(251, 191, 36, 0.4);
  background: rgba(251, 191, 36, 0.14);
}

@keyframes sol-plenum-ghost-fade {
  from { opacity: 0; }
  to { opacity: 0.5; }
}

/* ==================== CONTEXT MENU (Card Actions) ==================== */

.sol-grid-context-menu {
  position: fixed;
  z-index: 9999;
  min-width: 200px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255, 255, 255, 0.05);
  padding: var(--space-2) 0;
  animation: sol-grid-menu-in 150ms ease;
}

@keyframes sol-grid-menu-in {
  from { opacity: 0; transform: translateY(-4px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.sol-grid-context-menu-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4);
  font-size: var(--fs-sm);
  color: var(--text);
  cursor: pointer;
  transition: background var(--transition-fast);
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}

.sol-grid-context-menu-item:hover {
  background: rgba(255, 255, 255, 0.06);
}

.sol-grid-context-menu-item--danger {
  color: var(--error);
}

.sol-grid-context-menu-item--danger:hover {
  background: rgba(239, 68, 68, 0.1);
}

.sol-grid-context-menu-divider {
  height: 1px;
  background: var(--border);
  margin: var(--space-1) 0;
}

.sol-grid-context-menu-stage-jump {
  display: flex;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-4);
}

.sol-grid-context-menu-stage-input {
  width: 56px;
  min-height: 32px;
  padding: var(--space-1) var(--space-2);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: var(--fs-sm);
}

.sol-grid-context-menu-stage-input:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 1px;
}

.sol-grid-context-menu-jump-btn {
  flex: 1;
  min-height: 32px;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(99, 102, 241, 0.35);
  background: rgba(99, 102, 241, 0.12);
  color: var(--brand-light);
  font-size: var(--fs-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.sol-grid-context-menu-jump-btn:hover {
  background: rgba(99, 102, 241, 0.22);
  border-color: rgba(99, 102, 241, 0.55);
}

/* ==================== INSPECTOR SIDEBAR ==================== */

.sol-inspector {
  background: var(--panel);
  border-left: 1px solid var(--border);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.2) transparent;
  display: flex;
  flex-direction: column;
  /* Standardmäßig 0 Breite (nicht nur unsichtbar per transform, sondern
     nimmt auch keinen Platz im Flex-Row-Layout ein) — verhindert dass
     der geschlossene Inspector .sol-grid-viewport unnötig verschmälert
     oder zusätzliche Layout-Höhe beansprucht. Erst .has-inspector setzt
     die echte Breite (s.u.), danach übernimmt die Transform-Animation. */
  flex: 0 0 0;
  min-width: 0;
  /* Slide-In Animation – startet geschlossen */
  transform: translateX(100%);
  opacity: 0;
  transition:
    transform 350ms cubic-bezier(0.16, 1, 0.3, 1),
    opacity 220ms ease;
}

.sol-inspector.sol-inspector--open {
  transform: translateX(0);
  opacity: 1;
}

.sol-inspector::-webkit-scrollbar {
  width: 6px;
}

.sol-inspector::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.2);
  border-radius: 3px;
}

.sol-inspector-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5);
  border-bottom: 1px solid var(--border);
}

/* Track-Akzent oben */
.sol-inspector-header--track-a { border-top: 2px solid var(--track-a); }
.sol-inspector-header--track-b { border-top: 2px solid var(--track-b); }
.sol-inspector-header--track-c { border-top: 2px solid var(--track-c); }
.sol-inspector-header--all     { border-top: 2px solid var(--track-all); }

.sol-inspector-title {
  font-size: var(--fs-lg);
  font-weight: 600;
  color: var(--text);
}

.sol-inspector-body {
  flex: 1;
  padding: var(--space-5);
  overflow-y: auto;
}

.sol-inspector-footer {
  padding: var(--space-4);
  border-top: 1px solid var(--border);
  display: flex;
  gap: var(--space-2);
}

.sol-inspector-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-12);
  color: var(--muted);
  text-align: center;
  gap: var(--space-3);
}

.sol-inspector-empty svg {
  opacity: 0.3;
  color: var(--text-secondary, rgba(255,255,255,0.55));
}

/* Inspector auf Tablet/Mobile: bleibt via transform/opacity unsichtbar.
   openStationEditor() ruft auf ≤1279px ohnehin nur openStationModal() auf,
   so dass die Grid-Spalte nie gesetzt wird. */

/* ==================== VIEW TOGGLE ==================== */

.sol-grid-btn-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  font-size: var(--fs-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.sol-grid-btn-toggle:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  color: var(--text);
}

.sol-grid-btn-toggle.active {
  background: rgba(59, 130, 246, 0.15);
  border-color: rgba(59, 130, 246, 0.4);
  color: var(--brand-light);
}

.sol-view-toggle {
  display: inline-flex;
  gap: var(--space-2);
  margin-left: auto;
}

/* ==================== FAB (FLOATING ACTION BAR) ==================== */

.sol-fab {
  position: fixed;
  bottom: var(--space-4);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-2) var(--space-5);
  /* Transluzentes Glass-Floating-Element (Apple-Stil) statt undurchsichtiger
     Leiste — schwebt ueber dem Grid-Inhalt, statt eigenen Platz zu
     beanspruchen, dadurch kann .sol-grid-viewport die volle Panel-Hoehe
     nutzen. Wiederverwendet die bereits etablierten Glass-Tokens. */
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  box-shadow: 0 8px 24px rgba(99,102,241,0.18), 0 2px 6px rgba(0,0,0,0.25), inset 0 1px 0 rgba(255,255,255,0.08);
  z-index: 50;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.sol-fab-zoom {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--muted);
  font-size: var(--fs-sm);
  cursor: default;
}

.sol-grid-zoom-slider {
  width: 120px;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--border);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.sol-grid-zoom-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--brand);
  border: 2px solid var(--panel);
  box-shadow: 0 0 6px rgba(59, 130, 246, 0.4);
  cursor: pointer;
}

.sol-grid-zoom-slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--brand);
  border: 2px solid var(--panel);
  box-shadow: 0 0 6px rgba(59, 130, 246, 0.4);
  cursor: pointer;
}

.sol-fab-zoom-value {
  min-width: 36px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.sol-fab-divider {
  width: 1px;
  height: 24px;
  background: linear-gradient(to bottom, transparent, var(--border-light) 20%, var(--border-light) 80%, transparent);
}

/* ==================== MIGRATION WIZARD ==================== */

.sol-grid-migration-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
}

.sol-grid-migration-modal {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  max-width: 460px;
  width: 90%;
  padding: var(--space-8);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
  animation: sol-grid-menu-in 200ms ease;
}

.sol-grid-migration-title {
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--text);
  margin: 0 0 var(--space-4);
  font-family: 'Space Grotesk', sans-serif;
}

.sol-grid-migration-text {
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0 0 var(--space-6);
}

.sol-grid-migration-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
}

/* ==================== COMPACT BUTTONS (Grid-intern) ==================== */

.sol-grid-btn-add,
.sol-grid-btn-menu,
.sol-grid-btn-add-stage,
.sol-grid-btn-ki,
.sol-grid-btn-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-light);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: inherit;
}

.sol-grid-btn-add {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  font-size: var(--fs-lg);
}

.sol-grid-btn-menu {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
  padding: 0;
}

.sol-grid-btn-add-stage {
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--fs-sm);
  font-weight: 600;
  gap: var(--space-1);
}

.sol-grid-btn-ki {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--fs-sm);
  font-weight: 500;
  width: 100%;
  gap: var(--space-2);
}

.sol-grid-btn-close {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  font-size: var(--fs-lg);
}

.sol-grid-btn-add:hover,
.sol-grid-btn-menu:hover,
.sol-grid-btn-close:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

.sol-grid-btn-add-stage:hover {
  background: rgba(59, 130, 246, 0.15);
  border-color: rgba(59, 130, 246, 0.4);
  color: var(--brand-light);
}

/* ==================== INSPECTOR FOOTER BUTTONS ==================== */

.sol-grid-btn-inspector-delete {
  flex: 1;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  border: 1px solid rgba(239, 68, 68, 0.3);
  background: rgba(239, 68, 68, 0.1);
  color: var(--error);
  cursor: pointer;
  font-size: var(--fs-sm);
  font-weight: 600;
  transition: all var(--transition-fast);
}

.sol-grid-btn-inspector-delete:hover {
  background: rgba(239, 68, 68, 0.2);
  border-color: rgba(239, 68, 68, 0.5);
}

.sol-grid-btn-inspector-save {
  flex: 2;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  border: none;
  background: var(--brand);
  color: white;
  cursor: pointer;
  font-size: var(--fs-sm);
  font-weight: 600;
  transition: all var(--transition-fast);
}

.sol-grid-btn-inspector-save:hover {
  background: #2563eb;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

/* ==================== FOCUS-VISIBLE STATES ==================== */

.sol-grid-card:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
}

.sol-grid-context-menu-item:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: -2px;
  background: rgba(255, 255, 255, 0.06);
}

.sol-grid-btn-toggle:focus-visible,
.sol-grid-btn-add:focus-visible,
.sol-grid-btn-add-stage:focus-visible,
.sol-grid-btn-inspector-delete:focus-visible,
.sol-grid-btn-inspector-save:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
}

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

@media (max-width: 768px) {
  .sol-grid {
    grid-template-columns: 80px repeat(var(--sol-stages, 3), minmax(130px, 1fr));
  }

  .sol-grid-track-label-text {
    font-size: 0.65rem;
  }

  .sol-grid-canvas {
    padding: var(--space-2);
  }

  .sol-fab {
    bottom: var(--space-3);
    padding: var(--space-2) var(--space-3);
    gap: var(--space-2);
  }

  .sol-grid-zoom-slider {
    width: 80px;
  }
}

@media (max-width: 640px) {
  .sol-grid {
    grid-template-columns: 64px repeat(var(--sol-stages, 3), minmax(110px, 1fr));
    gap: var(--space-1);
  }

  .sol-grid-track-label {
    padding: var(--space-2) var(--space-1);
  }

  .sol-grid-track-label-text {
    font-size: 0.6rem;
    letter-spacing: 0.05em;
  }

  .sol-grid-card {
    padding: var(--space-1) var(--space-2);
    min-height: 44px;
  }
}

/* ── Paired Card: Checkpoint + Feedback zusammengefasst ─────────────────── */
.sol-grid-card--paired { padding: 0; gap: 0; overflow: hidden; }

.sol-paired-half {
  flex: 1;
  padding: var(--space-2) var(--space-3);
  cursor: pointer;
  transition: background 0.15s;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  min-height: 0;
}

.sol-paired-half:hover { background: rgba(255, 255, 255, 0.05); }

.sol-paired-connector {
  height: 1px;
  background: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  flex-shrink: 0;
}

.sol-paired-connector svg {
  position: absolute;
  width: 16px;
  height: 16px;
  background: var(--panel);
  padding: 2px;
  border-radius: 50%;
  color: var(--muted);
}

/* ==================== OUTLINE VIEW ==================== */
/* Stage-zentrierte Editor-Ansicht (primärer Editor) — löst das 2D-Grid als
   Standard ab. Nutzt dieselbe .sol-grid-layout/.sol-inspector-Struktur wie
   die Grid-Ansicht (has-inspector-Spalte), aber bewusst OHNE den Höhen-
   Scaffold (kein "sol-editor-active--bounded") — die Outline wächst
   natürlich mit dem Inhalt, .main scrollt die Seite ganz normal, statt
   einer zweiten, kleinen internen Scrollbox. Nur der Inhalt links
   (.sol-outline-viewport statt .sol-grid-viewport) ist neu. */

.sol-outline-viewport {
  padding-bottom: 80px; /* Platz fuer FAB */
  /* .sol-grid-layout ist Flexbox (Row) — auch hier flex:1;min-width:0
     noetig, damit die Outline-Liste den vollen verfuegbaren Platz neben
     einem (auf <1280px ohnehin nicht sichtbaren) Inspector bekommt. */
  flex: 1;
  min-width: 0;
}

.sol-outline-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4) 0;
}

.sol-outline-row {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-base);
}

.sol-outline-row[open] {
  border-color: rgba(99, 102, 241, 0.3);
}

.sol-outline-row-summary {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 44px;
  padding: var(--space-3) var(--space-4);
  cursor: pointer;
  list-style: none;
  position: relative;
  user-select: none;
}

.sol-outline-row-summary::-webkit-details-marker {
  display: none;
}

.sol-outline-row-summary::marker {
  content: '';
}

.sol-outline-row-summary:hover {
  background: rgba(255, 255, 255, 0.03);
}

.sol-outline-row-summary:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: -2px;
  border-radius: var(--radius-lg);
}

.sol-outline-row-caret {
  display: flex;
  color: var(--muted);
  flex-shrink: 0;
  transition: transform 300ms cubic-bezier(0.16, 1, 0.3, 1), color var(--transition-base);
}

.sol-outline-row[open] .sol-outline-row-caret {
  transform: rotate(90deg);
  color: var(--brand-light);
}

.sol-outline-row-title {
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-weight: 700;
  font-size: var(--fs-2xl);
  letter-spacing: -0.01em;
  color: var(--text);
  flex-shrink: 0;
}

.sol-outline-row-count {
  font-size: var(--fs-xs);
  color: var(--muted);
  flex: 1;
  min-width: 0;
}

.sol-outline-ki-btn {
  flex-shrink: 0;
  width: auto;
  padding: var(--space-1) var(--space-2);
}

/* Plenum-Station-Label: klickbares Textwort statt Icon (bewusst, damit kein
   weiterer Tooltip-erklärungsbedürftiger Icon-Button entsteht). Muss in
   allen 6 :not()-Ausnahmelisten in style.css stehen (CLAUDE.md §9), sonst
   greift die globale Button-Regel (min-height:48px;padding:12px 20px). */
.sol-outline-plenum-label {
  flex-shrink: 0;
  border: none;
  background: none;
  padding: var(--space-1) var(--space-2);
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--warning-light);
  cursor: pointer;
  white-space: nowrap;
  transition: color var(--transition-fast), text-decoration-color var(--transition-fast);
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 2px;
}

.sol-outline-plenum-label:hover:not(:disabled) {
  text-decoration-color: var(--warning-light);
}

.sol-outline-plenum-label:disabled {
  color: var(--muted);
  cursor: not-allowed;
}

/* Ghost-Zahl: reuse des .sol-unit-ghost-nr-Musters (style.css) auf Zeilenebene
   — Design-Hook, damit lange Stage-Listen sich wie Seitenzahlen überfliegen
   lassen, statt Text lesen zu müssen. */
.sol-outline-row-ghost {
  position: absolute;
  right: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 3rem;
  font-weight: 900;
  color: rgba(99, 102, 241, 0.06);
  line-height: 1;
  letter-spacing: -0.03em;
  pointer-events: none;
  user-select: none;
}

.sol-outline-row-body {
  padding: 0 var(--space-4) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  animation: sol-outline-expand 220ms cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes sol-outline-expand {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  .sol-outline-row-body { animation: none; }
  .sol-outline-row-caret { transition: none; }
}

.sol-outline-lane {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.02);
  border-left: 3px solid var(--track-all);
}

.sol-outline-lane--track-a { border-left-color: var(--track-a); }
.sol-outline-lane--track-b { border-left-color: var(--track-b); }
.sol-outline-lane--track-c { border-left-color: var(--track-c); }
.sol-outline-lane--all { border-left-color: var(--track-all); }

.sol-outline-lane-label {
  font-size: var(--fs-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  width: 68px;
  flex-shrink: 0;
}

.sol-outline-chip-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  flex: 1;
  min-width: 0;
}

.sol-outline-chip {
  display: inline-flex;
  align-items: stretch;
  gap: var(--space-1);
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-light);
  background: rgba(255, 255, 255, 0.04);
  transition: all var(--transition-fast);
  max-width: 280px;
}

.sol-outline-chip:hover {
  background: rgba(99, 102, 241, 0.08);
  border-color: rgba(99, 102, 241, 0.35);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.15);
}

.sol-outline-chip-click {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  cursor: pointer;
  min-height: 44px;
  min-width: 0;
  border-radius: var(--radius-pill);
}

.sol-outline-chip-click:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: -2px;
}

.sol-outline-chip-title {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: var(--fs-sm);
  color: var(--text);
  min-width: 0;
}

.sol-outline-chip-media {
  font-size: var(--fs-xs);
  flex-shrink: 0;
}

.sol-outline-chip .sol-grid-btn-menu {
  align-self: center;
  margin-right: var(--space-1);
  flex-shrink: 0;
}

.sol-outline-chip--paired {
  max-width: none;
  background: linear-gradient(90deg, rgba(239, 68, 68, 0.06), rgba(99, 102, 241, 0.06));
}

.sol-outline-chip-link {
  align-self: center;
  color: var(--muted);
  flex-shrink: 0;
}

.sol-outline-add-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  border: 2px dashed var(--border-light);
  background: transparent;
  color: var(--muted);
  font-size: var(--fs-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.sol-outline-add-chip:hover {
  border-color: var(--brand-light);
  color: var(--brand-light);
  background: rgba(99, 102, 241, 0.08);
}

.sol-outline-add-chip:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 1px;
}

@media (max-width: 768px) {
  .sol-outline-lane {
    flex-wrap: wrap;
  }
  .sol-outline-lane-label {
    width: 100%;
  }
  .sol-outline-row-ghost {
    font-size: 2rem;
  }
}

@media (max-width: 640px) {
  .sol-outline-row-title {
    font-size: var(--fs-sm);
  }
  .sol-outline-row-count {
    display: none;
  }
  .sol-outline-chip {
    max-width: 200px;
  }
}

/* ─── Q-190: Schreibschutz für Konten, die von Pro auf Free gefallen sind (2026-10-04) ───
   Der Schutz selbst liegt in firestore.rules (Q-025); hier nur die Sichtbarkeit.
   Leere Grid-Zellen, Add-Chips und Plenum-Labels per visibility statt display:none — das Grid
   platziert automatisch, ein display:none verschöbe die Stationen (Lehre 2026-07-11). */
.sol-readonly-fieldset { border: 0; padding: 0; margin: 0; min-width: 0; }

#view_classes.sol-readonly #solBtnNewUnit,
#view_classes.sol-readonly #solBtnImportUnit,
#view_classes.sol-readonly #solBtnLoadExample,
#view_classes.sol-readonly .sol-unit-archive-btn,
#view_classes.sol-readonly .sol-grid-btn-add-stage { display: none !important; }

#view_classes.sol-readonly .sol-grid-cell-empty,
#view_classes.sol-readonly .sol-outline-add-chip,
#view_classes.sol-readonly .sol-outline-plenum-label,
#view_classes.sol-readonly .sol-grid-plenum-ghost,
#view_classes.sol-readonly .sol-grid-plenum-ghost-label { visibility: hidden; pointer-events: none; }

/* Banner: Indigo (Marke, neutrale Information) — bewusst NICHT Orange: das ist Track B und im
   Radar „Kind hängt fest" (Farbregel 2026-08-30). */
.sol-readonly-banner {
  display: flex; gap: 12px; align-items: flex-start;
  margin: 0 0 18px; padding: 14px 18px;
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.28);
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(99, 102, 241, 0.12);
  color: var(--muted); font-size: 0.86rem; line-height: 1.5;
}
.sol-readonly-banner svg { color: var(--brand-light, #818cf8); flex-shrink: 0; margin-top: 2px; }
.sol-readonly-banner strong { display: block; color: var(--text); font-family: 'Space Grotesk', sans-serif; margin-bottom: 2px; }
.sol-readonly-banner a { color: var(--brand-light, #818cf8); }