/* 
 * Canvas Mode - Branch Visualization
 * Tree visualization for conversation branches
 */

/* =================================================================
   CANVAS CONTAINER
   ================================================================= */

.canvas-view {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--color-paper-warm);
}

.canvas-view.canvas-empty {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Loading State */
.canvas-loading-state {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  background: var(--color-paper-warm);
  animation: canvasFadeIn 0.3s ease-out;
}

.canvas-loading-content {
  text-align: center;
  max-width: 300px;
}

.canvas-loading-icon {
  display: flex;
  justify-content: center;
  align-items: center;
  color: var(--color-ink-lighter);
  margin-bottom: var(--space-4);
  animation: canvasPulse 2s infinite ease-in-out;
}

.canvas-loading-icon svg {
  width: 48px;
  height: 48px;
  stroke-width: 1.5;
}

.canvas-loading-text {
  font-size: var(--text-lg);
  font-weight: var(--weight-medium);
  color: var(--color-ink);
  margin-bottom: var(--space-2);
}

.canvas-loading-sub {
  font-size: var(--text-sm);
  color: var(--color-ink-lighter);
}

@keyframes canvasPulse {
  0% { opacity: 0.4; transform: scale(0.95); }
  50% { opacity: 0.8; transform: scale(1); }
  100% { opacity: 0.4; transform: scale(0.95); }
}

@keyframes canvasFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.canvas-empty-content {
  text-align: center;
  color: var(--color-ink-lighter);
}

.canvas-empty-content p {
  margin: var(--space-2) 0;
}

.canvas-empty-content .text-muted {
  font-size: var(--text-sm);
  opacity: 0.7;
}

/* =================================================================
   ZOOM CONTROLS
   ================================================================= */

.canvas-zoom-controls {
  position: absolute;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: var(--z-dropdown);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--color-paper);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-2);
  box-shadow: var(--shadow-lg);
}

.zoom-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  background: var(--color-paper);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--color-ink-light);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.zoom-btn:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-paper);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.zoom-btn:active {
  transform: translateY(0);
}

.zoom-level {
  display: inline-block;
  min-width: 48px;
  text-align: center;
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-ink);
}

/* =================================================================
   CANVAS AREA (Scrollable Container)
   ================================================================= */

.canvas-area {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: auto;
  padding: var(--space-6);
}

/* Custom scrollbar */
.canvas-area::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

.canvas-area::-webkit-scrollbar-track {
  background: var(--color-paper-cool);
}

.canvas-area::-webkit-scrollbar-thumb {
  background: var(--border-color-strong);
  border-radius: var(--radius-sm);
}

.canvas-area::-webkit-scrollbar-thumb:hover {
  background: var(--color-ink-lighter);
}

/* =================================================================
   CANVAS GRID (Zoomable/Pannable Layer)
   ================================================================= */

.canvas-grid {
  position: relative;
  z-index: var(--z-base);
  transform-origin: top left;
  will-change: transform;
}

/* =================================================================
   SVG CONNECTORS (Background Layer)
   ================================================================= */

.canvas-connectors {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
  overflow: visible;
}

.connector-line {
  stroke: var(--border-color-strong);
  stroke-width: 2px;
  fill: none;
  opacity: 0.5;
  transition: opacity var(--transition-fast);
}

.connector-line.cross-branch {
  stroke: var(--color-accent);
  stroke-dasharray: 6 3;
  opacity: 0.6;
}

.connector-line:hover {
  opacity: 1;
  stroke-width: 3px;
}

/* =================================================================
   CANVAS NODES
   ================================================================= */

.canvas-node {
  position: relative;
  background: var(--color-paper);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-fast);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  z-index: 2;
  min-height: 180px; /* Match NODE_HEIGHT from canvas-layout-engine.js for consistent connector alignment */
}

.canvas-node:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--color-accent);
}

.canvas-node.active-branch {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px var(--color-accent-subtle);
}

/* Node sections */
.canvas-node .node-prompt,
.canvas-node .node-response {
  padding: var(--space-3);
}

.canvas-node .node-prompt {
  background: var(--color-paper-cool);
  border-bottom: var(--border-width) solid var(--border-color);
}

.canvas-node .node-response.node-pending {
  background: var(--color-paper-warm);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-ink-lighter);
  text-align: center;
}

.canvas-node .node-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--color-ink-lighter);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.node-avatar-img {
  width: 14px;
  height: 14px;
  border-radius: var(--radius-full);
  object-fit: cover;
  flex-shrink: 0;
  display: block;
}

.node-author-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.canvas-node .node-text {
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  color: var(--color-ink);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Branch indicator on canvas nodes */
.canvas-node .branch-point-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  background: var(--color-accent-subtle);
  color: var(--color-accent);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  margin: var(--space-2) var(--space-3);
}

/* =================================================================
   CANVAS TOGGLE BUTTON ACTIVE STATE
   ================================================================= */

.icon-btn.active {
  background: var(--color-accent);
  color: var(--color-paper);
  border-color: var(--color-accent);
}

.icon-btn.active:hover {
  background: var(--color-accent-subtle);
}

/* =================================================================
   NODE HIGHLIGHT FLASH (for navigation)
   ================================================================= */

.convo-node.highlight-flash {
  animation: highlight-flash 1.5s ease-out;
}

@keyframes highlight-flash {
  0%, 30% {
    background-color: var(--color-accent-subtle);
    box-shadow: 0 0 0 4px var(--color-accent-subtle);
  }
  100% {
    background-color: transparent;
    box-shadow: none;
  }
}

/* =================================================================
   BRANCH STUB (Empty Branch Representation)
   ================================================================= */

.canvas-node.branch-stub {
  min-height: auto;
  background: linear-gradient(135deg, var(--color-paper) 0%, var(--color-paper-warm) 100%);
  border-style: dashed;
  border-color: var(--color-accent);
  opacity: 0.85;
}

.canvas-node.branch-stub:hover {
  opacity: 1;
  background: var(--color-accent-subtle);
  border-style: solid;
}

.canvas-node.branch-stub.active-branch {
  opacity: 1;
  border-style: solid;
  background: var(--color-accent-subtle);
}

.branch-stub-content {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
}

.branch-stub-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-accent-subtle);
  color: var(--color-accent);
  flex-shrink: 0;
}

.branch-stub-icon svg,
.branch-stub-icon i {
  width: 18px;
  height: 18px;
}

.branch-stub-info {
  flex: 1;
  min-width: 0;
}

.branch-stub-name {
  font-weight: var(--weight-semibold);
  font-size: var(--text-sm);
  color: var(--color-ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.branch-stub-desc {
  font-size: var(--text-xs);
  color: var(--color-ink-lighter);
  margin-top: 2px;
}

/* Stub connector line styling */
.connector-line.branch-stub-connector {
  stroke: var(--color-accent);
  stroke-dasharray: 8 4;
  opacity: 0.7;
}

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

@media (max-width: 768px) {
  .canvas-zoom-controls {
    bottom: var(--space-4);
    right: var(--space-4);
  }
  
  .canvas-node {
    min-width: 280px;
  }
  
  .canvas-node.branch-stub {
    min-width: 160px;
  }
}

/* =================================================================
   GHOST BRANCH (Empty Branch with Parent Node Preview)
   ================================================================= */

.canvas-node.ghost-branch {
  min-height: auto;
  background: linear-gradient(135deg, var(--color-paper-cool) 0%, var(--color-paper) 100%);
  border: 2px dashed var(--color-accent);
  opacity: 0.85;
  padding: var(--space-3);
}

.canvas-node.ghost-branch:hover {
  opacity: 1;
  border-style: solid;
  background: var(--color-paper);
  box-shadow: var(--shadow-md);
}

/* Ghost branch header */
.ghost-branch-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding-bottom: var(--space-2);
  border-bottom: 1px dashed var(--border-color);
  margin-bottom: var(--space-2);
}

.ghost-branch-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-accent-subtle);
  color: var(--color-accent);
  flex-shrink: 0;
}

.ghost-branch-icon svg,
.ghost-branch-icon i {
  width: 14px;
  height: 14px;
}

.ghost-branch-title {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.ghost-branch-name {
  font-weight: var(--weight-semibold);
  font-size: var(--text-sm);
  color: var(--color-ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ghost-branch-badge {
  display: inline-flex;
  padding: 2px 6px;
  background: var(--color-warning-subtle, #FFF8E1);
  color: var(--color-warning, #F57C00);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  border-radius: var(--radius-full);
}

/* Ghost node preview - shows parent node content */
.ghost-node-preview {
  background: var(--color-paper-cool);
  border-radius: var(--radius-md);
  padding: var(--space-2);
  margin-bottom: var(--space-2);
  opacity: 0.6;
  filter: grayscale(0.5);
  border: 1px dashed var(--border-color);
}

.ghost-node-label {
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  color: var(--color-ink-lighter);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-1);
}

.ghost-node-content {
  font-size: var(--text-xs);
  color: var(--color-ink-light);
  line-height: 1.5;
}

.ghost-node-prompt {
  margin-bottom: var(--space-1);
  color: var(--color-ink);
}

.ghost-node-response {
  color: var(--color-ink-lighter);
  font-style: italic;
}

/* Ghost branch action hint */
.ghost-branch-action {
  font-size: var(--text-xs);
  color: var(--color-accent);
  text-align: center;
  padding-top: var(--space-1);
  font-weight: var(--weight-medium);
}

/* =================================================================
   CANVAS BRANCH LABELS
   ================================================================= */

.canvas-branch-label {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  background: var(--color-paper);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-ink-light);
  z-index: 3;
  box-shadow: var(--shadow-sm);
  text-align: center;
}

.canvas-branch-label.main-branch {
  background: var(--color-paper-cool);
  border-color: var(--color-ink-lighter);
  color: var(--color-ink);
}

.canvas-branch-label.active {
  background: var(--color-accent-subtle);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* Branch Coloring based on base branch and level */
.canvas-branch-label.branch-color-1 {
  background: var(--color-branch-1-light);
  border-color: var(--color-branch-1);
  color: var(--color-branch-1);
}

.canvas-branch-label.branch-color-2 {
  background: var(--color-branch-2-light);
  border-color: var(--color-branch-2);
  color: var(--color-branch-2);
}

.canvas-branch-label.branch-color-3 {
  background: var(--color-branch-3-light);
  border-color: var(--color-branch-3);
  color: var(--color-branch-3);
}

.canvas-branch-label.branch-color-4 {
  background: var(--color-branch-4-light);
  border-color: var(--color-branch-4);
  color: var(--color-branch-4);
}

.canvas-branch-label.branch-color-5 {
  background: var(--color-branch-5-light);
  border-color: var(--color-branch-5);
  color: var(--color-branch-5);
}

/* Adjust colors for deeper levels to be "lighter" versions of the current branch color */
/* Since they are already using -light backgrounds, we increase transparency or use background-color override */
.canvas-branch-label[class*="branch-level-"]:not(.branch-level-0):not(.branch-level-1) {
  opacity: 0.85; /* Visual indicator of further level */
  font-weight: var(--weight-medium); /* Slightly less emphasis than first level branches */
}

/* Ensure active state still has some distinct look */
.canvas-branch-label.active[class*="branch-color-"] {
  box-shadow: 0 0 0 2px var(--color-paper), 0 0 0 4px currentColor;
}

.branch-label-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.7;
}

.branch-label-icon i,
.branch-label-icon svg {
  width: 14px;
  height: 14px;
}

.branch-label-text {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 200px;
}

/* =================================================================
   DELETED AND ERROR CHIPS (in Canvas View)
   ================================================================= */

/* Deleted chip - entity has been deleted */
.canvas-node .deleted-chip {
  opacity: 0.6;
  filter: grayscale(0.8);
}

.canvas-node .deleted-chip .chip-icon {
  opacity: 0.5;
}

.canvas-node .deleted-chip .chip-label {
  color: var(--color-ink-lighter);
  font-style: italic;
}

.canvas-node .deleted-chip:hover {
  opacity: 0.8;
}

/* Error chip - unexpected error resolving entity */
.canvas-node .error-chip {
  background: var(--color-paper-warm);
  border-color: var(--color-warning, #F57C00);
  opacity: 0.7;
}

.canvas-node .error-chip .chip-icon {
  opacity: 0.6;
}

.canvas-node .error-chip .chip-label {
  color: var(--color-warning, #F57C00);
  font-size: var(--text-xs);
}