/* ============================================
   Canvas — Element Layout Board + Layer Panel
   Foreground/background layers, draggable elements,
   layer panel, links, focus points
   ============================================ */

/* ---- Layout: Board + Layer Panel side by side ---- */
.canvas-layout {
  display: flex;
  gap: var(--space-sm);
  align-items: stretch;
}

/* ---- Board Container ---- */
.canvas-board {
  position: relative;
  flex: 1;
  min-width: 0;
  min-height: 320px;
  aspect-ratio: 16 / 9;
  background: var(--color-bg-card);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: visible;
  transition: aspect-ratio var(--transition-slow);
  cursor: crosshair;
}

/* Fallback static ratios (JS overrides via inline style) */
.canvas-board[data-ratio="16:9"] { aspect-ratio: 16 / 9; }
.canvas-board[data-ratio="9:16"] { aspect-ratio: 9 / 16; max-height: 600px; }
.canvas-board[data-ratio="1:1"]  { aspect-ratio: 1 / 1; }

/* Grid background */
.canvas-board::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(0deg, transparent, transparent 19px, rgba(240, 230, 240, 0.4) 19px, rgba(240, 230, 240, 0.4) 20px),
    repeating-linear-gradient(90deg, transparent, transparent 19px, rgba(240, 230, 240, 0.4) 19px, rgba(240, 230, 240, 0.4) 20px);
  pointer-events: none;
  z-index: 0;
}

/* Center crosshair */
.canvas-crosshair-h,
.canvas-crosshair-v {
  position: absolute;
  background: var(--color-candy-pink);
  opacity: 0.12;
  pointer-events: none;
  z-index: 0;
}
.canvas-crosshair-h { left: 0; right: 0; top: 50%; height: 1px; }
.canvas-crosshair-v { top: 0; bottom: 0; left: 50%; width: 1px; }

/* ---- Element Box (shared) ---- */
.elem-box {
  position: absolute;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 4px;
  cursor: grab;
  touch-action: none;
  transition: box-shadow var(--transition-fast), border-color var(--transition-fast);
  user-select: none;
  overflow: hidden;
}

.elem-box:active { cursor: grabbing; }

/* ---- Foreground element ---- */
.elem-fg {
  border: 2px solid var(--color-candy-pink);
  background: rgba(255, 143, 171, 0.06);
  box-shadow: 0 2px 8px rgba(255, 143, 171, 0.1);
}

.elem-fg.selected {
  border-color: var(--color-candy-pink);
  box-shadow: 0 0 0 3px rgba(255, 143, 171, 0.2), 0 4px 12px rgba(255, 143, 171, 0.15);
}

/* ---- Background element ---- */
.elem-bg {
  border: 2px dashed var(--color-candy-sky);
  background: rgba(137, 207, 243, 0.06);
  box-shadow: 0 2px 8px rgba(137, 207, 243, 0.1);
}

.elem-bg.selected {
  border-color: var(--color-candy-sky);
  box-shadow: 0 0 0 3px rgba(137, 207, 243, 0.2), 0 4px 12px rgba(137, 207, 243, 0.15);
}

/* ---- Link target highlight ---- */
.elem-box.link-target {
  animation: linkPulse 1s ease-in-out infinite;
}

@keyframes linkPulse {
  0%, 100% { box-shadow: 0 0 0 2px rgba(195, 166, 255, 0.2); }
  50% { box-shadow: 0 0 0 5px rgba(195, 166, 255, 0.4); }
}

/* ---- Element box inner labels ---- */
.elem-box-layer {
  position: absolute;
  top: 3px;
  left: 4px;
  font-size: 0.5rem;
  font-weight: 700;
  padding: 1px 4px;
  border-radius: 4px;
  line-height: 1.2;
}

.elem-fg .elem-box-layer {
  background: rgba(255, 143, 171, 0.2);
  color: var(--color-candy-pink);
}

.elem-bg .elem-box-layer {
  background: rgba(137, 207, 243, 0.2);
  color: var(--color-candy-sky);
}

.elem-box-name {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--color-text-primary);
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 100%;
}

.elem-box-desc {
  font-size: 0.55rem;
  color: var(--color-text-tertiary);
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 100%;
}

.elem-box-focus {
  font-size: 0.5rem;
  color: var(--color-candy-lemon);
  background: rgba(255, 230, 109, 0.15);
  padding: 0 3px;
  border-radius: 3px;
}

.elem-box-edit {
  position: absolute;
  top: 2px;
  right: 2px;
  width: 18px;
  height: 18px;
  background: rgba(255,255,255,0.8);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.elem-box:hover .elem-box-edit,
.elem-box.selected .elem-box-edit { opacity: 1; }

.elem-box-edit svg {
  width: 10px;
  height: 10px;
  color: var(--color-text-secondary);
}

.elem-box-coords {
  position: absolute;
  top: -18px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.55rem;
  color: var(--color-candy-pink);
  background: rgba(255,255,255,0.9);
  padding: 1px 5px;
  border-radius: 4px;
  pointer-events: none;
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
}

/* Flash animation when clicking layer tag */
.elem-flash {
  animation: elemFlash 0.6s ease;
}

@keyframes elemFlash {
  0%, 100% { filter: brightness(1); }
  50% { filter: brightness(1.3); }
}

/* ---- SVG Binding Lines ---- */
.binding-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 5;
}

/* ---- Edit Popup ---- */
.edit-popup {
  position: fixed;
  z-index: 9999;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  box-shadow: var(--shadow-lg);
  width: 220px;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  animation: fadeInUp 0.2s ease;
}

.popup-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.popup-field {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.popup-field label {
  font-size: 0.68rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.popup-input {
  padding: 5px 8px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-family: var(--font-sans);
  outline: none;
  transition: border-color var(--transition-fast);
}

.popup-input:focus {
  border-color: var(--color-candy-lavender);
}

.popup-textarea {
  padding: 5px 8px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.72rem;
  font-family: var(--font-sans);
  resize: vertical;
  min-height: 40px;
  outline: none;
  transition: border-color var(--transition-fast);
}

.popup-textarea:focus {
  border-color: var(--color-candy-lavender);
}

.popup-layer-toggle {
  display: flex;
  gap: 4px;
}

.popup-layer-btn,
.popup-type-btn {
  flex: 1;
  padding: 4px 8px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg-card);
  font-size: 0.72rem;
  font-weight: 500;
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.popup-layer-btn.active {
  background: var(--gradient-primary);
  color: #fff;
  border-color: transparent;
}

.popup-type-btn.active {
  background: var(--gradient-secondary);
  color: #fff;
  border-color: transparent;
}

.popup-actions {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-xs);
}

.popup-delete {
  background: none;
  border: none;
  color: var(--color-error);
  font-size: 0.75rem;
  cursor: pointer;
  font-weight: 500;
}

.popup-close {
  padding: 4px 12px;
  background: var(--gradient-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
}

/* ---- Link Picker Popup ---- */
.link-picker-popup {
  position: fixed;
  z-index: 9999;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  box-shadow: var(--shadow-lg);
  width: 200px;
  animation: fadeInUp 0.2s ease;
}

.popup-options {
  display: flex;
  flex-direction: column;
  gap: 3px;
  margin-top: var(--space-sm);
}

.popup-opt {
  padding: 5px 10px;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  background: var(--color-bg-card);
  font-size: 0.72rem;
  cursor: pointer;
  text-align: left;
  transition: all var(--transition-fast);
  color: var(--color-text-secondary);
}

.popup-opt:hover {
  background: #faf5ff;
  border-color: var(--color-candy-lavender);
  color: var(--color-candy-lavender);
}

/* ================================================================
   LAYER PANEL — Right-side tag list
   ================================================================ */

#layer-panel {
  width: 170px;
  min-width: 140px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  border-left: 1px solid var(--color-border-light);
  padding-left: var(--space-sm);
}

/* ---- Header: Add buttons ---- */
.layer-header {
  display: flex;
  gap: 4px;
}

.layer-add-btn {
  flex: 1;
  padding: 4px 6px;
  border-radius: var(--radius-sm);
  border: 1.5px dashed var(--color-border);
  background: none;
  font-size: 0.65rem;
  font-weight: 500;
  cursor: pointer;
  color: var(--color-text-tertiary);
  transition: all var(--transition-fast);
}

.layer-add-btn:hover {
  border-style: solid;
  color: var(--color-text-secondary);
}

.layer-add-fg:hover {
  border-color: var(--color-candy-pink);
  color: var(--color-candy-pink);
}

.layer-add-bg:hover {
  border-color: var(--color-candy-sky);
  color: var(--color-candy-sky);
}

/* ---- Tag List ---- */
.layer-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
  overflow-y: auto;
  max-height: 300px;
}

/* ---- Tag Item ---- */
.layer-tag {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 6px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 0.65rem;
}

.layer-tag:hover {
  background: rgba(195, 166, 255, 0.06);
  border-color: var(--color-border-light);
}

.layer-tag-active {
  background: rgba(195, 166, 255, 0.1);
  border-color: var(--color-candy-lavender);
}

.layer-tag-handle {
  cursor: grab;
  color: var(--color-text-tertiary);
  font-size: 0.75rem;
  flex-shrink: 0;
  user-select: none;
}

.layer-tag-icon {
  font-size: 0.5rem;
  font-weight: 700;
  padding: 1px 3px;
  border-radius: 3px;
  flex-shrink: 0;
}

.layer-tag-fg {
  background: rgba(255, 143, 171, 0.15);
  color: var(--color-candy-pink);
}

.layer-tag-bg {
  background: rgba(137, 207, 243, 0.15);
  color: var(--color-candy-sky);
}

.layer-tag-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--color-text-primary);
  font-weight: 500;
}

.layer-tag-up,
.layer-tag-edit,
.layer-tag-down,
.layer-tag-del {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.55rem;
  color: var(--color-text-tertiary);
  padding: 0 2px;
  opacity: 0;
  transition: opacity var(--transition-fast), color var(--transition-fast);
}

.layer-tag-edit {
  font-size: 0.62rem;
}

.layer-tag:hover .layer-tag-up,
.layer-tag:hover .layer-tag-edit,
.layer-tag:hover .layer-tag-down,
.layer-tag:hover .layer-tag-del { opacity: 1; }

.layer-tag-del:hover { color: var(--color-error); }
.layer-tag-up:hover,
.layer-tag-down:hover { color: var(--color-candy-lavender); }

/* Drag-to-reorder feedback */
.layer-tag-dragging { opacity: 0.4; }
.layer-tag-dragover { border-color: var(--color-candy-lavender); background: rgba(195, 166, 255, 0.12); }

/* ---- Footer: Link button ---- */
.layer-footer {
  padding-top: var(--space-xs);
  border-top: 1px solid var(--color-border-light);
}

.layer-link-btn {
  width: 100%;
  padding: 5px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: none;
  font-size: 0.68rem;
  font-weight: 500;
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.layer-link-btn:hover {
  border-color: var(--color-candy-lavender);
  color: var(--color-candy-lavender);
}

.layer-link-btn.active {
  background: var(--gradient-secondary);
  color: #fff;
  border-color: transparent;
}

/* ---- Existing Links Display ---- */
.layer-links {
  padding-top: var(--space-xs);
  border-top: 1px solid var(--color-border-light);
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.layer-links-title {
  font-size: 0.6rem;
  font-weight: 600;
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.layer-link-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.6rem;
  color: var(--color-text-secondary);
  padding: 2px 4px;
  border-radius: 4px;
  background: rgba(195, 166, 255, 0.05);
}

.layer-link-del {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-tertiary);
  font-size: 0.7rem;
}

.layer-link-del:hover { color: var(--color-error); }

/* ---- Toolbar ---- */
.canvas-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--space-sm);
  padding: 0 var(--space-xs);
}

.canvas-toolbar-left {
  display: flex;
  gap: var(--space-sm);
}

.canvas-toolbar-right {
  display: flex;
  align-items: center;
}

/* ---- Layer Filter Buttons ---- */
.layer-filter-row {
  display: flex;
  gap: 4px;
  margin-bottom: var(--space-sm);
}

.layer-filter-btn {
  flex: 1;
  padding: 4px 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: transparent;
  font-size: 0.72rem;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.layer-filter-btn.active {
  background: var(--gradient-primary);
  color: #fff;
  border-color: transparent;
}

.layer-filter-btn:hover:not(.active) {
  border-color: var(--color-candy-lavender);
}

/* ---- Hidden Layer Elements ---- */
.elem-box.layer-hidden {
  opacity: 0.12;
  pointer-events: none;
  filter: grayscale(0.8);
}

/* ---- Link Description in Panel ---- */
.layer-link-desc {
  font-size: 0.65rem;
  color: var(--color-text-tertiary);
  margin-top: 2px;
  font-style: italic;
}

/* ---- Dark mode readability on canvas ---- */
[data-theme="dark"] .elem-box {
  backdrop-filter: blur(1px);
}

[data-theme="dark"] .elem-box-name,
[data-theme="dark"] .elem-box-desc,
[data-theme="dark"] .elem-box-focus {
  padding: 1px 5px;
  border-radius: 6px;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

[data-theme="dark"] .elem-box-name {
  background: rgba(20, 16, 34, 0.72);
  color: #f6f2ff;
}

[data-theme="dark"] .elem-box-desc {
  background: rgba(20, 16, 34, 0.6);
  color: #d6cfe8;
}

[data-theme="dark"] .elem-box-focus {
  background: rgba(255, 230, 109, 0.2);
  color: #fff6be;
}

/* ---- Composition Pill Buttons ---- */
.comp-row {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

.comp-row-res {
  margin-top: 6px;
}

.comp-res-label {
  font-size: 0.72rem;
  color: var(--color-text-tertiary);
  margin-right: 4px;
  white-space: nowrap;
}

.comp-pill {
  padding: 4px 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: transparent;
  font-size: 0.72rem;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.comp-pill.active {
  background: var(--gradient-primary);
  color: #fff;
  border-color: transparent;
  box-shadow: var(--shadow-glow-pink);
}

.comp-pill:hover:not(.active) {
  border-color: var(--color-candy-lavender);
  color: var(--color-candy-lavender);
}

.comp-pill-sm {
  padding: 2px 8px;
  font-size: 0.65rem;
}

.comp-ori-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border: 1px solid var(--color-candy-lavender);
  border-radius: var(--radius-full);
  background: rgba(195, 166, 255, 0.08);
  font-size: 0.72rem;
  color: var(--color-candy-lavender);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.comp-ori-btn:hover {
  background: rgba(195, 166, 255, 0.18);
}