* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
      background: #f5f5f5;
      height: 100vh;
      overflow: hidden;
    }

    .app {
      display: flex;
      height: 100vh;
    }

    /* Component Palette */
    .palette {
      width: 250px;
      background: white;
      border-right: 1px solid #ddd;
      padding: 20px;
      overflow-y: auto;
    }

    .palette h2 {
      font-size: 18px;
      margin-bottom: 20px;
      color: #333;
    }

    .palette-item {
      background: #4A90E2;
      color: white;
      padding: 15px;
      margin-bottom: 10px;
      border-radius: 4px;
      cursor: move;
      text-align: center;
      font-weight: 500;
      user-select: none;
      transition: transform 0.2s, box-shadow 0.2s;
    }

    .palette-item:hover {
      transform: translateY(-2px);
      box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    }

    .palette-item.dragging-from-palette {
      opacity: 0.5;
    }

    /* History Controls */
    .history-controls {
      display: flex;
      gap: 8px;
      margin-top: 10px;
    }

    .history-btn {
      flex: 1;
      padding: 10px;
      border: 1px solid #ddd;
      background: white;
      border-radius: 4px;
      cursor: pointer;
      font-size: 13px;
      font-weight: 500;
      transition: all 0.2s;
    }

    .history-btn:hover:not(:disabled) {
      background: #f5f5f5;
      border-color: #4A90E2;
      color: #4A90E2;
    }

    .history-btn:disabled {
      opacity: 0.4;
      cursor: not-allowed;
    }

    /* Main Canvas */
    .canvas {
      flex: 1;
      padding: 20px;
      overflow: auto;
      position: relative;
    }

    .canvas-header {
      background: white;
      padding: 15px 20px;
      margin-bottom: 20px;
      border-radius: 4px;
      box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    }

    .canvas-header h1 {
      font-size: 24px;
      color: #333;
      margin-bottom: 5px;
    }

    .canvas-header p {
      color: #666;
      font-size: 14px;
    }

    .canvas-header .controls {
      margin-top: 10px;
      display: flex;
      gap: 10px;
      align-items: center;
    }

    .viewport-toggle {
      display: flex;
      gap: 4px;
      background: #f5f5f5;
      padding: 4px;
      border-radius: 6px;
    }

    .viewport-btn {
      padding: 8px 16px;
      border: none;
      background: transparent;
      border-radius: 4px;
      cursor: pointer;
      font-size: 13px;
      transition: all 0.2s;
      color: #666;
      font-weight: 500;
    }

    .viewport-btn:hover {
      background: rgba(74, 144, 226, 0.1);
      color: #4A90E2;
    }

    .viewport-btn.active {
      background: white;
      color: #4A90E2;
      box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    }

    .canvas-header button {
      padding: 8px 16px;
      border: 1px solid #ddd;
      background: white;
      border-radius: 4px;
      cursor: pointer;
      font-size: 13px;
      transition: all 0.2s;
    }

    .canvas-header button:hover {
      background: #f5f5f5;
      border-color: #4A90E2;
    }

    .canvas-header button.active {
      background: #4A90E2;
      color: white;
      border-color: #4A90E2;
    }

    /* Version Switcher */
    .version-switcher {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 12px;
      background: #f8f9fa;
      border: 1px solid #dee2e6;
      border-radius: 4px;
      font-size: 12px;
    }

    .version-switcher-label {
      color: #666;
      font-weight: 500;
    }

    .version-switcher select {
      padding: 4px 8px;
      border: 1px solid #dee2e6;
      border-radius: 3px;
      background: white;
      color: #333;
      font-size: 12px;
      cursor: pointer;
      outline: none;
      transition: border-color 0.2s;
    }

    .version-switcher select:hover {
      border-color: #4A90E2;
    }

    .version-switcher select:focus {
      border-color: #4A90E2;
      box-shadow: 0 0 0 2px rgba(74, 144, 226, 0.1);
    }

    /* Canvases Container */
    .canvases-container {
      display: flex;
      flex-direction: column;
      background: white;
      border-radius: 8px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.1);
      overflow: hidden;
      transition: max-width 0.3s ease;
      margin: 0 auto;
    }

    .canvases-container.mobile-view {
      max-width: 480px;
    }

    .canvas-item {
      display: flex;
      flex-direction: column;
      width: 100%;
      position: relative;
    }

    .canvas-item-header {
      position: absolute;
      top: 10px;
      right: 10px;
      background: rgba(255, 255, 255, 0.95);
      padding: 8px 12px;
      border-radius: 4px;
      box-shadow: 0 2px 4px rgba(0,0,0,0.1);
      display: flex;
      gap: 10px;
      align-items: center;
      z-index: 1000;
      font-size: 12px;
      color: #666;
      opacity: 0.7;
      transition: opacity 0.2s;
      pointer-events: auto;
    }

    .canvas-item:hover .canvas-item-header {
      opacity: 1;
    }

    .canvas-item-header h3 {
      font-size: 11px;
      color: #999;
      margin: 0;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .canvas-controls {
      display: flex;
      gap: 8px;
      align-items: center;
    }

    .canvas-controls label {
      font-size: 11px;
      color: #666;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .canvas-bg-color {
      cursor: pointer;
      width: 32px;
      height: 24px;
      border: 1px solid #ddd;
      border-radius: 3px;
    }

    .clear-canvas-btn {
      padding: 4px 8px;
      border: 1px solid #ddd;
      background: white;
      border-radius: 3px;
      cursor: pointer;
      font-size: 11px;
      transition: all 0.2s;
    }

    .clear-canvas-btn:hover {
      background: #f5f5f5;
      border-color: #ff4444;
      color: #ff4444;
    }

    /* Grid Builder */
    .grid-builder {
      position: relative;
      flex: 1;
    }

    .grid-container {
      position: relative;
      width: 100%;
      min-height: 400px;
      background-image:
        linear-gradient(rgba(0,0,0,0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,0,0,0.05) 1px, transparent 1px);
      background-size: 2% 20px;
      transition: background-color 0.2s;
    }

    .grid-container.hide-grid {
      background-image: none;
    }

    /* Grid Items */
    .grid-item {
      position: absolute;
      background: white;
      border: 2px solid transparent;
      border-radius: 4px;
      padding: 20px 20px 20px 44px; /* Extra left padding for drag handle */
      cursor: default;
      transition: border-color 0.2s, box-shadow 0.2s;
      box-shadow: 0 2px 4px rgba(0,0,0,0.1);
      min-width: 100px;
      min-height: 80px;
      user-select: none;
    }

    .grid-item:hover {
      border-color: #4A90E2;
    }

    .grid-item.selected {
      border-color: #4A90E2;
      box-shadow: 0 4px 12px rgba(74, 144, 226, 0.3);
      z-index: 1000;
    }

    .grid-item.dragging {
      opacity: 0.7;
      cursor: move;
    }

    .grid-item.resizing {
      user-select: none;
    }

    .grid-item-header {
      font-weight: 600;
      color: #333;
      margin-bottom: 5px;
      font-size: 14px;
    }

    .grid-item-content {
      color: #666;
      font-size: 13px;
    }

    .grid-item-controls {
      position: absolute;
      top: 8px;
      right: 8px;
      display: flex;
      gap: 4px;
      opacity: 0;
      transition: opacity 0.2s;
    }

    .grid-item.selected .grid-item-controls,
    .grid-item:hover .grid-item-controls {
      opacity: 1;
    }

    .grid-item-control-btn {
      width: 24px;
      height: 24px;
      background: #4A90E2;
      color: white;
      border: none;
      border-radius: 4px;
      cursor: pointer;
      font-size: 12px;
      line-height: 1;
      padding: 0;
      transition: background 0.2s;
    }

    .grid-item-control-btn:hover {
      background: #357ABD;
    }

    .grid-item-delete {
      width: 24px;
      height: 24px;
      background: #ff4444;
      color: white;
      border: none;
      border-radius: 50%;
      cursor: pointer;
      font-size: 14px;
      line-height: 1;
      padding: 0;
      transition: background 0.2s;
    }

    .grid-item-delete:hover {
      background: #cc0000;
    }

    /* Resize Handles */
    .resize-handle {
      position: absolute;
      width: 10px;
      height: 10px;
      background: #4A90E2;
      border: 2px solid white;
      border-radius: 50%;
      box-shadow: 0 0 3px rgba(0,0,0,0.3);
      opacity: 0;
      transition: opacity 0.2s;
    }

    .grid-item.selected .resize-handle,
    .grid-item:hover .resize-handle {
      opacity: 1;
    }

    .resize-handle.nw { top: -5px; left: -5px; cursor: nw-resize; }
    .resize-handle.ne { top: -5px; right: -5px; cursor: ne-resize; }
    .resize-handle.sw { bottom: -5px; left: -5px; cursor: sw-resize; }
    .resize-handle.se { bottom: -5px; right: -5px; cursor: se-resize; }
    .resize-handle.n { top: -5px; left: 50%; transform: translateX(-50%); cursor: n-resize; }
    .resize-handle.s { bottom: -5px; left: 50%; transform: translateX(-50%); cursor: s-resize; }
    .resize-handle.e { top: 50%; right: -5px; transform: translateY(-50%); cursor: e-resize; }
    .resize-handle.w { top: 50%; left: -5px; transform: translateY(-50%); cursor: w-resize; }

    /* Drag Clone */
    .dragging-clone {
      position: fixed;
      pointer-events: none;
      z-index: 10000;
      opacity: 0.9;
      background: white;
      color: #333;
      border: 2px solid #4A90E2;
      border-radius: 4px;
      box-shadow: 0 8px 24px rgba(74, 144, 226, 0.4);
    }

    /* Drop Zone Indicator */
    .drop-zone-indicator {
      position: absolute;
      border: 2px dashed #4A90E2;
      background: rgba(74, 144, 226, 0.1);
      border-radius: 4px;
      pointer-events: none;
      opacity: 0;
      transition: opacity 0.2s;
    }

    .drop-zone-indicator.active {
      opacity: 1;
    }

    /* Drag Handle */
    .drag-handle {
      position: absolute;
      top: 8px;
      left: 8px;
      width: 28px;
      height: 28px;
      background: rgba(74, 144, 226, 0.1);
      border: 1px solid rgba(74, 144, 226, 0.3);
      border-radius: 4px;
      cursor: move;
      display: flex;
      align-items: center;
      justify-content: center;
      opacity: 0.3;
      transition: all 0.2s;
      z-index: 10;
    }

    .drag-handle::before {
      content: '⋮⋮';
      font-size: 14px;
      color: #4A90E2;
      font-weight: bold;
      letter-spacing: -2px;
    }

    .grid-item:hover .drag-handle {
      opacity: 1;
      background: rgba(74, 144, 226, 0.15);
    }

    .drag-handle:hover {
      background: rgba(74, 144, 226, 0.25);
      transform: scale(1.1);
    }

    /* Configuration Side Panel */
    .config-panel {
      position: fixed;
      top: 0;
      right: -400px;
      width: 400px;
      height: 100vh;
      background: white;
      box-shadow: -2px 0 8px rgba(0,0,0,0.15);
      transition: right 0.3s ease;
      z-index: 10000;
      display: flex;
      flex-direction: column;
    }

    .config-panel.open {
      right: 0;
    }

    .config-panel-header {
      padding: 20px;
      border-bottom: 1px solid #ddd;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .config-panel-header h2 {
      margin: 0;
      font-size: 18px;
      color: #333;
    }

    .config-panel-close {
      width: 32px;
      height: 32px;
      border: none;
      background: transparent;
      cursor: pointer;
      font-size: 24px;
      color: #666;
      border-radius: 4px;
      transition: all 0.2s;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 0;
    }

    .config-panel-close:hover {
      background: #f5f5f5;
      color: #333;
    }

    .config-panel-body {
      padding: 20px;
      flex: 1;
      overflow-y: auto;
    }

    .config-field {
      margin-bottom: 20px;
    }

    .config-field label {
      display: block;
      margin-bottom: 8px;
      font-weight: 600;
      color: #333;
      font-size: 14px;
    }

    .config-field input {
      width: 100%;
      padding: 10px 12px;
      border: 1px solid #ddd;
      border-radius: 4px;
      font-size: 14px;
      font-family: inherit;
      transition: border-color 0.2s;
    }

    .config-field input:focus {
      outline: none;
      border-color: #4A90E2;
      box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
    }

    .z-index-controls {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 8px;
    }

    .z-index-btn {
      padding: 10px 12px;
      border: 1px solid #ddd;
      background: white;
      border-radius: 4px;
      cursor: pointer;
      font-size: 13px;
      font-weight: 500;
      transition: all 0.2s;
      text-align: center;
    }

    .z-index-btn:hover {
      background: #f5f5f5;
      border-color: #4A90E2;
      color: #4A90E2;
    }

    .z-index-btn:active {
      transform: translateY(1px);
    }

    .config-panel-footer {
      padding: 20px;
      border-top: 1px solid #ddd;
      display: flex;
      gap: 10px;
      justify-content: flex-end;
    }

    .config-panel-footer button {
      padding: 10px 20px;
      border: 1px solid #ddd;
      background: white;
      border-radius: 4px;
      cursor: pointer;
      font-size: 14px;
      font-weight: 500;
      transition: all 0.2s;
    }

    .config-panel-footer button:hover {
      background: #f5f5f5;
    }

    .config-panel-footer button.primary {
      background: #4A90E2;
      color: white;
      border-color: #4A90E2;
    }

    .config-panel-footer button.primary:hover {
      background: #357ABD;
      border-color: #357ABD;
    }

/* Performance Badge Tooltip */
.info-badge:hover .tooltip {
  display: block !important;
}