/* ==========================================================
   form-builder.css — Builder Canvas, Palette & Properties
   ========================================================== */

/* ---- Three-Column Layout ---- */
.builder-layout {
  display: grid;
  grid-template-columns: 240px 1fr 280px;
  gap: var(--space-base);
  min-height: calc(100vh - 140px);
  align-items: start;
}

/* ---- Builder Sidebar (Left & Right) ---- */
.builder-sidebar {
  position: sticky;
  top: var(--space-lg);
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-base);
}

.builder-sidebar-left {
  /* Left column */
}

.builder-sidebar-right {
  /* Right column */
}

/* ---- Builder Panel (generic) ---- */
.builder-panel-title {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--space-sm);
  padding: 0 var(--space-xs);
}

/* ---- Field Palette ---- */
.builder-palette {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--space-md);
}

.palette-items {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.palette-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 8px 10px;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  background: var(--color-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  cursor: grab;
  transition: all var(--transition-fast);
  user-select: none;
}

.palette-item:hover {
  background: var(--color-bg-card);
  border-color: var(--color-primary);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.palette-item:active {
  cursor: grabbing;
  transform: translateY(0);
  box-shadow: none;
}

.palette-item .icon {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  opacity: 0.6;
}

.palette-item:hover .icon {
  opacity: 1;
}

.palette-item.drag-ghost {
  opacity: 0.5;
  transform: rotate(2deg);
}

/* ---- Section List ---- */
.builder-section-list {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--space-md);
}

.section-list-items {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.section-list-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 6px 8px;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.section-list-item:hover {
  background: var(--color-bg-hover);
  color: var(--color-text);
}

.section-list-item.active {
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
}

.section-list-item .icon {
  flex-shrink: 0;
  width: 14px;
  height: 14px;
  opacity: 0.5;
}

.section-list-item.active .icon {
  opacity: 1;
}

.section-list-item .section-list-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.section-list-item .section-list-count {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  background: var(--color-bg);
  padding: 1px 6px;
  border-radius: 8px;
}

/* ============================================================
   CANVAS
   ============================================================ */
.builder-canvas {
  min-height: 400px;
}

/* Canvas Empty State */
.canvas-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-xxl) var(--space-lg);
  background: var(--color-bg-card);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  text-align: center;
  color: var(--color-text-muted);
  min-height: 300px;
}

.canvas-empty-state .icon {
  margin-bottom: var(--space-base);
  opacity: 0.3;
  color: var(--color-text-muted);
}

.canvas-empty-state h3 {
  font-size: var(--font-size-md);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
}

.canvas-empty-state p {
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-lg);
}

/* Canvas Sections Container */
.canvas-sections {
  display: flex;
  flex-direction: column;
  gap: var(--space-base);
}

/* ---- Canvas Section ---- */
.canvas-section {
  background: var(--color-bg-card);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.canvas-section:hover {
  border-color: var(--color-text-muted);
}

.canvas-section.active {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.canvas-section-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border-light);
  min-height: 42px;
}

.canvas-section-header .drag-handle {
  display: flex;
  align-items: center;
  cursor: grab;
  color: var(--color-text-muted);
  padding: 2px;
  flex-shrink: 0;
}

.canvas-section-header .drag-handle:active {
  cursor: grabbing;
}

.canvas-section-header .section-title-text {
  flex: 1;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.canvas-section-header .section-actions {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-shrink: 0;
}

.canvas-section-header .section-actions .btn-icon {
  padding: 3px;
  min-width: 22px;
  min-height: 22px;
}

/* Canvas Section Body */
.canvas-section-body {
  padding: var(--space-md);
  min-height: 60px;
  transition: background var(--transition-fast);
}

.canvas-section-body.drag-over {
  background: var(--color-bg-drop);
  border: 2px dashed var(--color-primary);
  border-radius: var(--radius-md);
  margin: var(--space-sm);
}

/* Canvas Section Empty */
.canvas-section-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  border: 2px dashed var(--color-border-light);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  text-align: center;
  min-height: 80px;
}

/* ---- Canvas Field Grid ---- */
.canvas-field-grid {
  display: grid;
  gap: var(--space-sm);
}

.canvas-field-grid.cols-1 {
  grid-template-columns: 1fr;
}

.canvas-field-grid.cols-2 {
  grid-template-columns: 1fr 1fr;
}

.canvas-field-grid.cols-3 {
  grid-template-columns: 1fr 1fr 1fr;
}

.canvas-field-grid.cols-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* ---- Canvas Field ---- */
.canvas-field {
  display: flex;
  flex-direction: column;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
  min-height: 48px;
}

.canvas-field:hover {
  border-color: var(--color-text-muted);
  background: var(--color-bg);
}

.canvas-field.active {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  box-shadow: 0 0 0 2px rgba(0, 115, 230, 0.15);
}

.canvas-field.drag-ghost {
  opacity: 0.4;
  transform: scale(0.98);
}

.canvas-field.drag-over {
  border-top: 3px solid var(--color-primary);
}

.canvas-field.drag-over-bottom {
  border-bottom: 3px solid var(--color-primary);
}

.canvas-field.width-full {
  grid-column: 1 / -1;
}

/* Canvas Field Header */
.canvas-field-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

.canvas-field-header .field-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}

.canvas-field-header .field-required {
  color: var(--color-danger);
  margin-left: 2px;
}

.canvas-field-header .field-type-tag {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  background: var(--color-bg);
  padding: 1px 6px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  flex-shrink: 0;
}

.canvas-field-header .field-actions {
  display: flex;
  align-items: center;
  gap: 1px;
  flex-shrink: 0;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.canvas-field:hover .field-actions {
  opacity: 1;
}

.canvas-field-header .field-actions .btn-icon {
  padding: 2px;
  min-width: 20px;
  min-height: 20px;
}

/* Canvas Field Preview */
.canvas-field-preview {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ---- Add Section Button ---- */
.builder-add-section {
  margin-top: var(--space-base);
  border-style: dashed;
  color: var(--color-text-muted);
}

.builder-add-section:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

/* ============================================================
   PROPERTIES PANEL
   ============================================================ */
.properties-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-xxl) var(--space-base);
  text-align: center;
  color: var(--color-text-muted);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  min-height: 200px;
}

.properties-empty .icon {
  margin-bottom: var(--space-md);
  opacity: 0.3;
}

.properties-empty p {
  font-size: var(--font-size-sm);
  max-width: 200px;
}

.properties-content {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--space-base);
  max-height: calc(100vh - 300px);
  overflow-y: auto;
}

.properties-section {
  margin-bottom: var(--space-base);
  padding-bottom: var(--space-base);
  border-bottom: 1px solid var(--color-border-light);
}

.properties-section:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.properties-section-header {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--space-sm);
}

.properties-section-body {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

/* ============================================================
   CONFIG TABS (inside builder right panel)
   ============================================================ */
.builder-config-tabs {
  margin-top: var(--space-base);
}

.config-tab-buttons {
  display: flex;
  gap: 0;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2px;
  margin-bottom: var(--space-base);
}

.config-tab-btn {
  flex: 1;
  padding: 6px 8px;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-muted);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  text-align: center;
}

.config-tab-btn:hover {
  color: var(--color-text);
}

.config-tab-btn.active {
  background: var(--color-bg-card);
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
  box-shadow: var(--shadow-sm);
}

.config-tab-content {
  display: none;
}

.config-tab-content.active {
  display: block;
}

/* ---- Config Section (inside config tabs) ---- */
.config-section {
  margin-bottom: var(--space-lg);
}

.config-section:last-child {
  margin-bottom: 0;
}

.config-section-title {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid var(--color-border-light);
}

/* ---- Config Items List ---- */
.config-items-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-bottom: var(--space-sm);
}

.config-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 6px 8px;
  background: var(--color-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.config-item:hover {
  border-color: var(--color-border);
  background: var(--color-bg-card);
}

.config-item-drag {
  display: flex;
  align-items: center;
  cursor: grab;
  color: var(--color-text-muted);
  flex-shrink: 0;
  padding: 2px;
}

.config-item-drag:active {
  cursor: grabbing;
}

.config-item-info {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 0;
}

.config-item-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.config-item-desc {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.config-item-actions {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-shrink: 0;
}

.config-item-actions .btn-icon {
  padding: 2px;
  min-width: 22px;
  min-height: 22px;
}

/* ---- Mapping Row (Import) ---- */
.column-mapping-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.mapping-row {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-bg);
  border-radius: var(--radius-md);
}

.csv-column {
  flex: 1;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mapping-arrow {
  color: var(--color-text-muted);
  flex-shrink: 0;
  font-size: var(--font-size-lg);
}

.mapping-row .form-select {
  flex: 1;
}

/* ---- Form Meta Area in Builder ---- */
.builder-form-meta {
  margin-bottom: var(--space-lg);
}