body {
      box-sizing: border-box;
    }
    
    .tool-button {
      transition: all 0.2s ease;
    }
    
    .tool-button:hover {
      transform: translateY(-2px);
      box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    }
    
    .tool-button.active {
      box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.5);
    }
    
    #canvas {
      cursor: crosshair;
      box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    }
@view-transition { navigation: auto; }