/**
 * Block Builder Styles
 * Visual algorithm builder with drag & drop blocks
 */

/* ============================================
   MAIN LAYOUT
   ============================================ */

.block-builder-container {
  --builder-mobile-nav-height: 78px;
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 0;
  overflow: hidden;
  background:
    radial-gradient(circle at top right, rgba(56, 97, 251, 0.09), transparent 44%),
    var(--bg-primary);
}

/* ============================================
   PACKAGE TABS
   ============================================ */

.canvas-packages {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-bottom: 2px solid var(--border-color);
  overflow-x: auto;
  scrollbar-width: thin;
}

.packages-tabs {
  display: flex;
  gap: 8px;
  flex: 1;
}

.package-tab {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--bg-tertiary);
  border: 2px solid transparent;
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.package-tab:hover {
  background: var(--bg-hover);
  transform: translateY(-1px);
}

.package-tab.active {
  background: var(--bg-primary);
  border-color: var(--package-color, #3861fb);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.package-tab .package-icon {
  font-size: 1.1rem;
  line-height: 1;
}

.package-tab .package-name {
  font-weight: 600;
}

.package-tab.package-add {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border: none;
}

.package-tab.package-add:hover {
  background: linear-gradient(135deg, #5568d3 0%, #6a3f8f 100%);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.packages-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.package-delete-btn,
.package-duplicate-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.package-duplicate-btn {
  color: #8ea7ff;
}

.package-delete-btn:hover {
  background: var(--bg-danger);
  border-color: var(--text-danger);
  color: var(--text-danger);
  transform: scale(1.05);
}

.package-duplicate-btn:hover {
  background: rgba(56, 97, 251, 0.15);
  border-color: rgba(56, 97, 251, 0.45);
  color: #c5d5ff;
  transform: scale(1.05);
}

.package-delete-btn svg,
.package-duplicate-btn svg {
  width: 18px;
  height: 18px;
}

.block-builder-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 24px;
  border-bottom: 1px solid var(--border-color);
  background: linear-gradient(180deg, rgba(56, 97, 251, 0.08) 0%, var(--bg-secondary) 100%);
  position: sticky;
  top: 0;
  z-index: 30;
  flex-shrink: 0;
}

.builder-title h2 {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.25;
  color: var(--text-primary);
  margin: 0;
}

.builder-title p {
  font-size: 0.875rem;
  line-height: 1.4;
  color: var(--text-muted);
  margin: 4px 0 0 0;
}

.builder-actions-header {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.block-builder-header .builder-docs-btn {
  min-width: 92px;
  justify-content: center;
}

.builder-clear-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.builder-clear-btn:hover {
  background: rgba(234, 57, 67, 0.12);
  border-color: rgba(234, 57, 67, 0.45);
  color: #ff858f;
  transform: translateY(-1px);
}

.builder-clear-btn svg {
  width: 16px;
  height: 16px;
}

.builder-history-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.builder-history-btn:hover:not(:disabled) {
  background: var(--bg-hover);
  border-color: var(--border-color-hover);
  color: var(--text-primary);
}

.builder-history-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.builder-history-btn svg {
  width: 16px;
  height: 16px;
}

.builder-ai-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: linear-gradient(135deg, rgba(56, 97, 251, 0.2), rgba(88, 141, 255, 0.16));
  border: 1px solid rgba(56, 97, 251, 0.45);
  border-radius: 8px;
  color: #d4e0ff;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.builder-ai-btn:hover {
  transform: translateY(-1px);
  border-color: rgba(56, 97, 251, 0.7);
  box-shadow: 0 8px 20px rgba(56, 97, 251, 0.2);
}

.builder-ai-btn svg {
  width: 16px;
  height: 16px;
}

.builder-simple-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.builder-simple-btn:hover {
  background: var(--bg-hover);
  border-color: var(--border-color-hover);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.builder-simple-btn.active {
  border-color: rgba(56, 97, 251, 0.6);
  background: rgba(56, 97, 251, 0.16);
  color: #d7e2ff;
}

.builder-simple-btn svg {
  width: 16px;
  height: 16px;
}

.builder-ai-panel {
  display: flex;
  align-items: flex-end;
  gap: 12px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border-color);
  background: linear-gradient(180deg, rgba(56, 97, 251, 0.09), rgba(56, 97, 251, 0.03));
}

.builder-ai-panel-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.builder-ai-panel-main label {
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: #8ea7ff;
}

.builder-ai-panel-main textarea {
  min-height: 70px;
  resize: vertical;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.88rem;
}

.builder-ai-panel-main textarea:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(56, 97, 251, 0.18);
}

.builder-ai-generate-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: 165px;
  padding: 11px 14px;
  border: none;
  border-radius: 8px;
  background: linear-gradient(135deg, #3861fb 0%, #2952e3 100%);
  color: white;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.builder-ai-generate-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(56, 97, 251, 0.35);
}

.builder-ai-generate-btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.builder-ai-generate-btn svg {
  width: 15px;
  height: 15px;
}

.block-builder-layout {
  display: grid;
  grid-template-columns: 250px 1fr 340px;
  flex: 1;
  min-height: 0;
  overflow: hidden;
  gap: 14px;
  padding: 14px;
}

/* ============================================
   BLOCK PALETTE (Left Panel)
   ============================================ */

.block-palette-panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.14);
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 14px;
}

.palette-header {
  padding: 10px 12px 16px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 12px;
}

.palette-header h3 {
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--text-primary);
  margin: 0;
}

.palette-header p {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin: 4px 0 0 0;
}

.palette-categories {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.palette-category {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
}

.category-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 11px 12px;
  cursor: pointer;
  transition: background 0.2s ease;
}

.category-header:hover {
  background: var(--bg-tertiary);
}

.category-icon {
  font-size: 1rem;
}

.category-name {
  flex: 1;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
}

.category-count {
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--bg-tertiary);
  padding: 2px 6px;
  border-radius: 10px;
}

.category-chevron {
  width: 16px;
  height: 16px;
  color: var(--text-muted);
  transition: transform 0.2s;
}

.palette-category.collapsed .category-chevron {
  transform: rotate(-90deg);
}

.category-blocks {
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.palette-category.collapsed .category-blocks {
  display: none;
}

/* Palette Block (draggable from palette) */
.palette-block {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  background: var(--block-primary, #3861fb);
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.18);
  cursor: grab;
  transition: all 0.2s ease;
  user-select: none;
}

.palette-block:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.palette-block:active {
  cursor: grabbing;
  transform: scale(0.98);
}

.palette-block.dragging {
  opacity: 0.5;
}

.palette-block-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
}

.palette-block-icon svg {
  width: 16px;
  height: 16px;
  color: var(--block-text, white);
}

.palette-block-name {
  font-size: 0.813rem;
  font-weight: 500;
  color: var(--block-text, white);
}

/* ============================================
   BLOCK CANVAS (Center Panel)
   ============================================ */

.block-canvas-panel {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.16);
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 22px;
  position: relative;
}

.canvas-content {
  display: flex;
  flex-direction: column;
  gap: 0;
  max-width: 600px;
  margin: 0 auto;
}

.canvas-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 18px;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.1);
}

.section-label {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
}

.section-label svg {
  width: 18px;
  height: 18px;
}

/* Drop Zone */
.drop-zone {
  min-height: 60px;
  border: 2px dashed var(--border-color);
  border-radius: 10px;
  padding: 13px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  overscroll-behavior: contain;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.015), rgba(255, 255, 255, 0.005));
  transition: all 0.2s ease;
}

.drop-zone.drag-over {
  border-color: var(--accent-blue);
  background: rgba(56, 97, 251, 0.08);
  box-shadow: 0 0 0 3px rgba(56, 97, 251, 0.16);
}

.conditions-drop,
.actions-drop {
  max-height: 360px;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.drop-hint {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* Canvas Connector */
.canvas-connector {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 8px 0;
}

.connector-line {
  width: 2px;
  height: 20px;
  background: var(--border-color);
}

.connector-arrow {
  width: 0;
  height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 8px solid var(--border-color);
}

/* Empty State */
.canvas-empty-state {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  color: var(--text-muted);
  pointer-events: none;
}

.canvas-empty-state.hidden {
  display: none;
}

.canvas-empty-state svg {
  width: 64px;
  height: 64px;
  margin-bottom: 16px;
  opacity: 0.3;
}

.canvas-empty-state p {
  font-size: 0.875rem;
}

/* ============================================
   BLOCK ITEMS (on canvas)
   ============================================ */

.block-item {
  background: var(--block-primary, #3861fb);
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
  overflow: visible;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.block-item:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.26);
}

.block-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 11px 12px;
  background: var(--block-secondary, #2d4ec9);
}

.block-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
}

.block-icon svg {
  width: 16px;
  height: 16px;
  color: var(--block-text, white);
}

.block-name {
  flex: 1;
  font-size: 0.813rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--block-text, white);
}

.block-delete-btn {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.2);
  border: none;
  border-radius: 4px;
  color: var(--block-text, white);
  font-size: 1rem;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.2s, background 0.2s;
}

.block-item:hover .block-delete-btn {
  opacity: 1;
}

.block-delete-btn:hover {
  background: rgba(255, 255, 255, 0.3);
}

/* Block Parameters */
.block-params {
  padding: 11px 12px 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  background: rgba(0, 0, 0, 0.14);
}

.block-param {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 100px;
}

.block-param label {
  font-size: 0.688rem;
  color: rgba(255, 255, 255, 0.7);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.block-param-input {
  padding: 6px 8px;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 6px;
  color: white;
  font-size: 0.813rem;
  outline: none;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.block-param-input:focus {
  border-color: rgba(255, 255, 255, 0.4);
  background: rgba(255, 255, 255, 0.2);
}

.block-param-input option {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.block-param-input[type="date"] {
  font-family: 'Outfit', sans-serif;
  cursor: pointer;
}

.block-param-input[type="date"]::-webkit-calendar-picker-indicator {
  cursor: pointer;
  filter: invert(0.8);
}

.conditional-param {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed rgba(255, 255, 255, 0.2);
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Matched Stock Styling */
.matched-option {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.2) 0%, rgba(245, 158, 11, 0.1) 100%) !important;
  border-left: 3px solid #f59e0b !important;
}

.matched-option:hover {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.3) 0%, rgba(245, 158, 11, 0.2) 100%) !important;
}

.matched-option .stock-dropdown-symbol {
  color: #f59e0b !important;
  font-weight: 600;
}

.matched-option .stock-dropdown-name {
  color: #fbbf24 !important;
  font-style: italic;
}

.stock-dropdown-selected.matched-stock {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.3) 0%, rgba(245, 158, 11, 0.15) 100%) !important;
  border: 1px solid rgba(245, 158, 11, 0.5) !important;
}

.stock-dropdown-selected.matched-stock .stock-dropdown-text {
  color: #fbbf24 !important;
  font-weight: 600;
}

/* ============================================
   CUSTOM STOCK DROPDOWN WITH LOGOS
   ============================================ */

.stock-param {
  min-width: 140px;
}

.stock-dropdown {
  position: relative;
  cursor: pointer;
}

.stock-dropdown.open {
  z-index: 30;
}

.stock-dropdown-selected {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 4px;
  transition: all 0.2s;
}

.stock-dropdown-selected:hover {
  background: rgba(255, 255, 255, 0.2);
}

.stock-dropdown.open .stock-dropdown-selected {
  border-color: rgba(255, 255, 255, 0.4);
  background: rgba(255, 255, 255, 0.2);
}

.stock-dropdown-logo {
  width: 20px;
  height: 20px;
  border-radius: 4px;
  object-fit: contain;
  background: white;
}

.stock-dropdown-text {
  flex: 1;
  font-size: 0.813rem;
  font-weight: 500;
  line-height: 1.3;
  color: white;
}

.stock-dropdown-arrow {
  width: 14px;
  height: 14px;
  color: rgba(255, 255, 255, 0.7);
  transition: transform 0.2s;
}

.stock-dropdown.open .stock-dropdown-arrow {
  transform: rotate(180deg);
}

.stock-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  margin-top: 4px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  max-height: 240px;
  overflow-y: auto;
  z-index: 1000;
  display: none;
}

.stock-dropdown.open .stock-dropdown-menu {
  display: block;
}

.stock-dropdown-item {
  display: grid;
  grid-template-columns: auto minmax(56px, max-content) minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  cursor: pointer;
  transition: background 0.15s;
  position: relative;
}

.stock-dropdown-item:hover {
  background: var(--bg-tertiary);
}

.stock-dropdown-item.selected {
  background: rgba(56, 97, 251, 0.2);
}

.stock-dropdown-item .stock-dropdown-logo {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  flex-shrink: 0;
}

.stock-dropdown-symbol {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  min-width: 50px;
  white-space: nowrap;
}

.stock-dropdown-name {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.stock-dropdown-meta {
  font-size: 0.68rem;
  color: rgba(251, 191, 36, 0.78);
  font-style: italic;
  white-space: nowrap;
}

/* Block Preview Text */
.block-preview-text {
  padding: 8px 12px;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.8);
  background: rgba(0, 0, 0, 0.15);
}

/* Block Wrapper with Logic Connector */
.block-wrapper {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.block-logic-connector {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4px 0;
}

.logic-select {
  padding: 5px 12px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  color: var(--text-secondary);
  font-size: 0.72rem;
  font-weight: 600;
  cursor: pointer;
  letter-spacing: 0.04em;
}

/* Section Colors */
.timing-section {
  border-color: #f39c12;
}

.timing-section .section-label {
  color: #f39c12;
}

.conditions-section {
  border-color: #3861fb;
}

.conditions-section .section-label {
  color: #3861fb;
}

.actions-section {
  border-color: #16c784;
}

.actions-section .section-label {
  color: #16c784;
}

/* ============================================
   PREVIEW PANEL (Right Panel)
   ============================================ */

.block-preview-panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.14);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.preview-header {
  padding: 16px 18px;
  border-bottom: 1px solid var(--border-color);
  background: linear-gradient(180deg, rgba(56, 97, 251, 0.08), transparent);
}

.preview-header h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.preview-header svg {
  width: 18px;
  height: 18px;
}

.preview-content {
  flex: 1;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.preview-section {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 12px;
}

.preview-section h4 {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin: 0 0 8px 0;
}

.preview-plain-english {
  font-size: 0.875rem;
  color: var(--text-primary);
  line-height: 1.6;
  white-space: pre-wrap;
}

.preview-empty {
  color: var(--text-muted);
  font-style: italic;
}

/* Collapsible Code Section */
.collapsible-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}

.collapsible-header svg {
  width: 16px;
  height: 16px;
  color: var(--text-muted);
  transition: transform 0.2s;
}

.preview-section.collapsed .collapsible-header svg {
  transform: rotate(-90deg);
}

.preview-section.collapsed .preview-code-wrapper {
  display: none;
}

.preview-code-wrapper {
  margin-top: 8px;
  border-radius: 6px;
  overflow: hidden;
}

.preview-code {
  margin: 0;
  padding: 12px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--text-secondary);
  overflow-x: auto;
  white-space: pre;
}

/* Summary */
.preview-summary {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.summary-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 9px 10px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
}

.summary-label {
  font-size: 0.813rem;
  color: var(--text-muted);
}

.summary-value {
  font-size: 0.813rem;
  font-weight: 500;
  color: var(--text-primary);
}

.builder-metrics-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.builder-metric-card {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-tertiary);
  padding: 8px;
  display: grid;
  gap: 4px;
}

.builder-metric-label {
  font-size: 0.68rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.builder-metric-value {
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
}

.builder-last-decision {
  margin-top: 9px;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid rgba(56, 97, 251, 0.25);
  background: rgba(56, 97, 251, 0.1);
  color: #c9d7ff;
  font-size: 0.79rem;
  line-height: 1.4;
}

/* Errors */
.preview-errors {
  background: rgba(234, 57, 67, 0.1);
  border: 1px solid rgba(234, 57, 67, 0.3);
  border-radius: 8px;
  padding: 12px;
}

.preview-errors h4 {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--accent-red);
  margin-bottom: 8px;
}

.preview-errors h4 svg {
  width: 16px;
  height: 16px;
}

.preview-errors ul {
  margin: 0;
  padding: 0 0 0 20px;
}

.preview-errors li {
  font-size: 0.813rem;
  color: var(--accent-red);
  margin-bottom: 4px;
}

/* Footer Actions */
.preview-footer {
  padding: 16px 18px 18px;
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--bg-secondary);
}

.algorithm-name-input {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.algorithm-name-input label {
  font-size: 0.76rem;
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.algorithm-name-input input,
.algorithm-budget-input input {
  padding: 10px 12px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.9rem;
  width: 100%;
}

.algorithm-name-input input:focus,
.algorithm-budget-input input:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(56, 97, 251, 0.18);
}

.create-algorithm-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  background: linear-gradient(135deg, #3861fb 0%, #2952e3 100%);
  border: none;
  border-radius: 8px;
  color: white;
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
}

.create-algorithm-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 18px rgba(56, 97, 251, 0.35);
  filter: brightness(1.03);
}

.create-algorithm-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.create-algorithm-btn svg {
  width: 16px;
  height: 16px;
}

.algorithm-budget-input {
  border: 1px solid rgba(56, 97, 251, 0.45);
  border-radius: 10px;
  padding: 12px;
  background: linear-gradient(180deg, rgba(56, 97, 251, 0.12), rgba(56, 97, 251, 0.03));
}

.algorithm-budget-input label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: #8ea7ff;
}

.algorithm-budget-input .required-mark {
  color: #ff7880;
}

.budget-input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.budget-currency {
  position: absolute;
  left: 12px;
  color: var(--text-muted);
  font-weight: 700;
  z-index: 1;
}

.algorithm-budget-input input {
  padding-left: 28px;
  font-size: 0.95rem;
  font-weight: 700;
  background: rgba(0, 0, 0, 0.08);
}

.budget-available {
  display: block;
  margin-top: 6px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.block-budget-quick-actions {
  margin-top: 10px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.block-budget-chip {
  appearance: none;
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-secondary);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  padding: 5px 10px;
  cursor: pointer;
  transition: all 0.18s ease;
}

.block-budget-chip:hover {
  border-color: rgba(56, 97, 251, 0.55);
  color: var(--text-primary);
  background: rgba(56, 97, 251, 0.12);
}

.block-budget-chip.active {
  border-color: rgba(56, 97, 251, 0.7);
  background: rgba(56, 97, 251, 0.22);
  color: #d9e4ff;
  box-shadow: 0 0 0 2px rgba(56, 97, 251, 0.2);
}

.block-create-hint {
  grid-column: 1 / -1;
  border-radius: 8px;
  border: 1px solid transparent;
  padding: 9px 11px;
  font-size: 0.82rem;
  line-height: 1.4;
}

.block-create-hint.info {
  border-color: rgba(56, 97, 251, 0.35);
  background: rgba(56, 97, 251, 0.12);
  color: #c9d7ff;
}

.block-create-hint.success {
  border-color: rgba(22, 199, 132, 0.35);
  background: rgba(22, 199, 132, 0.12);
  color: #bdf5dd;
}

.block-create-hint.error {
  border-color: rgba(234, 57, 67, 0.35);
  background: rgba(234, 57, 67, 0.12);
  color: #ffb8bd;
}

#blockAvailableBudget {
  font-weight: 700;
  color: var(--text-primary);
}

.test-algorithm-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-secondary);
  font-size: 0.813rem;
  cursor: pointer;
  transition: all 0.2s;
}

.test-algorithm-btn:hover {
  border-color: var(--text-muted);
  color: var(--text-primary);
}

.test-algorithm-btn svg {
  width: 14px;
  height: 14px;
}

/* ============================================
   BLOCK BUILDER MODALS
   ============================================ */

.bb-modal-backdrop {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(3px);
  z-index: 1200;
  padding: 16px;
}

.bb-modal {
  width: min(460px, 100%);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
  padding: 18px;
}

.bb-modal-title {
  margin: 0 0 8px;
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 700;
}

.bb-modal-message {
  margin: 0 0 14px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.45;
}

.bb-modal-input {
  width: 100%;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.9rem;
}

.bb-modal-input:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(56, 97, 251, 0.18);
}

.bb-modal-actions {
  margin-top: 14px;
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.bb-modal-btn {
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-primary);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
}

.bb-modal-btn:hover {
  background: var(--bg-hover);
}

.bb-modal-btn.danger {
  background: rgba(234, 57, 67, 0.15);
  border-color: rgba(234, 57, 67, 0.4);
  color: #ff9da3;
}

.bb-modal-btn.danger:hover {
  background: rgba(234, 57, 67, 0.24);
}

/* ============================================
   PROFESSIONAL VISUAL POLISH
   ============================================ */

.block-builder-container {
  background:
    radial-gradient(circle at 100% -10%, rgba(56, 97, 251, 0.08), transparent 42%),
    radial-gradient(circle at 0% 110%, rgba(22, 199, 132, 0.05), transparent 34%),
    var(--bg-primary);
}

.canvas-packages,
.block-builder-header {
  background: var(--bg-secondary);
}

.canvas-packages {
  border-bottom: 1px solid var(--border-color);
}

.package-tab {
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  font-weight: 600;
}

.package-tab:hover {
  background: var(--bg-tertiary);
  border-color: var(--border-color-hover);
  transform: translateY(-1px);
}

.package-tab.active {
  border-color: var(--package-color, var(--accent-blue));
  background: linear-gradient(180deg, rgba(56, 97, 251, 0.1), rgba(56, 97, 251, 0.04));
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
}

.package-tab.package-add {
  background: var(--accent-blue);
  border: 1px solid rgba(255, 255, 255, 0.14);
}

.package-tab.package-add:hover {
  background: #2f56e8;
  box-shadow: 0 8px 18px rgba(56, 97, 251, 0.34);
}

.package-delete-btn,
.package-duplicate-btn {
  border-radius: 8px;
}

.block-builder-layout {
  gap: 12px;
  padding: 12px;
}

.block-palette-panel,
.block-canvas-panel,
.block-preview-panel {
  border-radius: 12px;
  border: 1px solid var(--border-color);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.14);
}

.block-palette-panel,
.block-preview-panel {
  background: var(--bg-secondary);
}

.block-canvas-panel {
  background:
    linear-gradient(rgba(255, 255, 255, 0.015), rgba(255, 255, 255, 0.015)),
    var(--bg-primary);
}

.canvas-section {
  border-radius: 12px;
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.drop-zone {
  border-radius: 10px;
  border-style: solid;
  border-width: 1px;
  background: rgba(255, 255, 255, 0.02);
}

.drop-zone.drag-over {
  border-width: 1px;
}

.palette-block {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--block-primary, #3861fb);
  border-radius: 10px;
  box-shadow: none;
}

.palette-block:hover {
  background: var(--bg-tertiary);
  border-color: var(--border-color-hover);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.12);
}

.palette-block-icon {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: var(--block-primary, #3861fb);
  flex-shrink: 0;
}

.palette-block-name {
  color: var(--text-primary);
  font-weight: 600;
}

.block-item {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--block-primary, #3861fb);
  border-radius: 12px;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.16);
  overflow: visible;
}

.block-item:hover {
  border-color: var(--border-color-hover);
  box-shadow: 0 14px 24px rgba(0, 0, 0, 0.2);
}

.block-header {
  background: rgba(255, 255, 255, 0.02);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  padding: 10px 12px;
}

.block-icon {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: var(--block-primary, #3861fb);
}

.block-name {
  color: var(--text-primary);
  font-size: 0.82rem;
}

.block-delete-btn {
  opacity: 1;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.block-delete-btn:hover {
  background: rgba(234, 57, 67, 0.18);
  border-color: rgba(234, 57, 67, 0.4);
}

.block-params {
  background: rgba(255, 255, 255, 0.01);
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}

.block-param label {
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

.block-param-input,
.stock-dropdown-selected {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
}

.block-param-input:focus,
.stock-dropdown.open .stock-dropdown-selected {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(56, 97, 251, 0.2);
  background: var(--bg-secondary);
}

.stock-dropdown-selected:hover {
  background: var(--bg-tertiary);
}

.stock-dropdown-text {
  color: var(--text-primary);
}

.stock-dropdown-arrow {
  color: var(--text-muted);
}

.stock-dropdown-menu {
  border-radius: 10px;
  border: 1px solid var(--border-color);
}

.preview-section {
  border-radius: 10px;
}

.summary-item {
  border-radius: 8px;
}

.algorithm-budget-input {
  border: 1px solid rgba(56, 97, 251, 0.35);
  background: linear-gradient(180deg, rgba(56, 97, 251, 0.09), rgba(56, 97, 251, 0.025));
}

.algorithm-budget-input label {
  color: #a9bbff;
}

.create-algorithm-btn {
  border-radius: 10px;
  background: linear-gradient(135deg, #3b63fa 0%, #2a4fda 100%);
}

.create-algorithm-btn:hover {
  box-shadow: 0 12px 22px rgba(56, 97, 251, 0.32);
}

.builder-clear-btn,
.test-algorithm-btn {
  border-radius: 8px;
  font-weight: 600;
}

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

@media (max-width: 1200px) {
  .block-builder-layout {
    grid-template-columns: 220px 1fr 300px;
  }
}

@media (max-width: 992px) {
  .block-builder-layout {
    grid-template-columns: 220px 1fr;
  }
  
  .block-preview-panel {
    display: none;
  }
}

@media (max-width: 768px) {
  .builder-actions-header {
    flex-wrap: wrap;
    justify-content: flex-end;
  }

  .builder-ai-panel {
    flex-direction: column;
    align-items: stretch;
  }

  .builder-ai-generate-btn {
    width: 100%;
  }

  .block-builder-layout {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 10px;
  }
  
  .block-palette-panel {
    position: fixed;
    bottom: calc(var(--builder-mobile-nav-height) + env(safe-area-inset-bottom, 0px));
    left: 8px;
    right: 8px;
    height: 200px;
    border-right: 1px solid var(--border-color);
    border-top: 1px solid var(--border-color);
    z-index: 260;
  }
  
  .palette-categories {
    flex-direction: row;
    overflow-x: auto;
    padding-bottom: 80px;
  }
  
  .palette-category {
    min-width: 200px;
  }
  
  .block-canvas-panel {
    padding-bottom: calc(236px + var(--builder-mobile-nav-height) + env(safe-area-inset-bottom, 0px));
  }

  .conditions-drop,
  .actions-drop {
    max-height: 42vh;
  }
}

/* CSS Variables are inherited from styles.css */

/* ============================================
   LAYOUT HARDENING (OVERLAP FIXES)
   ============================================ */

.block-builder-container {
  --builder-shell-offset: 140px;
  min-height: 0;
  height: 100%;
  overflow: hidden;
}

.canvas-packages {
  align-items: stretch;
}

.packages-tabs {
  min-width: 0;
}

.package-tab {
  max-width: 210px;
}

.package-tab .package-name {
  overflow: hidden;
  text-overflow: ellipsis;
}

.block-builder-header {
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
}

.builder-title {
  flex: 1 1 320px;
  min-width: 0;
}

.builder-title p {
  max-width: 65ch;
}

.builder-actions-header {
  flex: 1 1 360px;
  justify-content: flex-end;
}

.builder-validate-btn,
.builder-simulate-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.builder-validate-btn:hover,
.builder-simulate-btn:hover {
  background: var(--bg-hover);
  border-color: var(--border-color-hover);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.builder-simulate-btn {
  border-color: rgba(56, 97, 251, 0.4);
  color: #b9cbff;
}

.builder-validate-btn svg,
.builder-simulate-btn svg {
  width: 16px;
  height: 16px;
}

.block-builder-container.simple-view .builder-ai-panel {
  display: none !important;
}

.block-builder-container.simple-view .preview-section.collapsible {
  display: none;
}

.block-builder-layout,
.block-palette-panel,
.block-canvas-panel,
.block-preview-panel {
  min-height: 0;
}

.canvas-content {
  max-width: 680px;
  min-width: 0;
}

.preview-summary {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.summary-value {
  max-width: 58%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.preview-simulation {
  display: grid;
  gap: 8px;
}

.preview-simulation-line {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.preview-simulation-line.good {
  color: #6ee7b7;
}

.preview-simulation-line.warn {
  color: #fbbf24;
}

.preview-simulation-line.bad {
  color: #fca5a5;
}

.stock-dropdown-item {
  line-height: 1.25;
}

.stock-dropdown-symbol {
  overflow: hidden;
  text-overflow: ellipsis;
}

@media (max-width: 768px) {
  .builder-actions-header {
    width: 100%;
    justify-content: stretch;
    gap: 8px;
  }

  .builder-actions-header > button {
    flex: 1 1 calc(50% - 8px);
    justify-content: center;
    min-height: 38px;
  }

  .builder-history-btn {
    flex: 0 0 calc(50% - 8px);
  }

  .package-tab {
    max-width: 150px;
  }

  .builder-metrics-grid {
    grid-template-columns: 1fr;
  }

  .summary-value {
    max-width: 52%;
  }
}