:root{--color-background: #ffffff;--color-surface: #f5f5f5;--color-surface-hover: #eeeeee;--color-border: #e0e0e0;--color-text-primary: #212121;--color-text-secondary: #757575;--color-primary: #2196f3;--color-primary-hover: #1976d2;--color-accent: #ff4081;--color-success: #4caf50;--color-warning: #ff9800;--color-error: #f44336;--color-grid-dot: #bdbdbd;--color-canvas-bg: #fafafa;--color-outline: #2196f3;--color-selection: rgba(33, 150, 243, .2);--shadow-sm: 0 1px 3px rgba(0, 0, 0, .12);--shadow-md: 0 4px 6px rgba(0, 0, 0, .12);--shadow-lg: 0 10px 20px rgba(0, 0, 0, .15);--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 16px;--spacing-lg: 24px;--spacing-xl: 32px;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;--font-size-xs: 11px;--font-size-sm: 12px;--font-size-base: 14px;--font-size-lg: 16px;--font-size-xl: 20px;--toolbar-height: 48px;--sidebar-width: 280px}[data-theme=dark]{--color-background: #1e1e1e;--color-surface: #2d2d2d;--color-surface-hover: #3a3a3a;--color-border: #404040;--color-text-primary: #e0e0e0;--color-text-secondary: #9e9e9e;--color-primary: #42a5f5;--color-primary-hover: #64b5f6;--color-accent: #ff4081;--color-success: #66bb6a;--color-warning: #ffa726;--color-error: #ef5350;--color-grid-dot: #424242;--color-canvas-bg: #252525;--color-outline: #42a5f5;--color-selection: rgba(66, 165, 245, .2);--shadow-sm: 0 1px 3px rgba(0, 0, 0, .3);--shadow-md: 0 4px 6px rgba(0, 0, 0, .3);--shadow-lg: 0 10px 20px rgba(0, 0, 0, .4)}*{margin:0;padding:0;box-sizing:border-box}html,body{width:100%;height:100%;overflow:hidden}body{font-family:var(--font-family);font-size:var(--font-size-base);color:var(--color-text-primary);background-color:var(--color-background);transition:background-color .3s,color .3s}#app{width:100%;height:100%;display:flex;flex-direction:column}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--color-surface)}::-webkit-scrollbar-thumb{background:var(--color-border);border-radius:var(--radius-sm)}::-webkit-scrollbar-thumb:hover{background:var(--color-text-secondary)}.icon-button{display:flex;align-items:center;justify-content:center;width:32px;height:32px;border:none;background:transparent;color:var(--color-text-primary);cursor:pointer;border-radius:var(--radius-sm);transition:background-color .2s}.icon-button:hover{background-color:var(--color-surface-hover)}.icon-button:active{background-color:var(--color-border)}.icon-button.active{background-color:var(--color-primary);color:#fff}.divider{width:1px;height:24px;background-color:var(--color-border);margin:0 var(--spacing-sm)}.panel{background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);overflow:hidden}.section-header{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-sm) var(--spacing-md);background-color:var(--color-surface);border-bottom:1px solid var(--color-border);font-weight:600;font-size:var(--font-size-sm);text-transform:uppercase;letter-spacing:.5px;color:var(--color-text-secondary);cursor:pointer;-webkit-user-select:none;user-select:none}.section-header:hover{background-color:var(--color-surface-hover)}.input-field{width:100%;padding:var(--spacing-sm);border:1px solid var(--color-border);border-radius:var(--radius-sm);background-color:var(--color-background);color:var(--color-text-primary);font-size:var(--font-size-sm);font-family:var(--font-family);outline:none;transition:border-color .2s}.input-field:focus{border-color:var(--color-primary)}.button{padding:var(--spacing-sm) var(--spacing-md);border:none;border-radius:var(--radius-sm);background-color:var(--color-primary);color:#fff;font-size:var(--font-size-sm);font-family:var(--font-family);font-weight:500;cursor:pointer;transition:background-color .2s}.button:hover{background-color:var(--color-primary-hover)}.button:active{transform:scale(.98)}.button.secondary{background-color:var(--color-surface);color:var(--color-text-primary);border:1px solid var(--color-border)}.button.secondary:hover{background-color:var(--color-surface-hover)}.top-toolbar{display:flex;align-items:center;height:var(--toolbar-height);padding:0 var(--spacing-md);background-color:var(--color-surface);border-bottom:1px solid var(--color-border);gap:var(--spacing-sm)}.top-toolbar.hidden{display:none}.main-container{display:flex;height:calc(100% - var(--toolbar-height));overflow:hidden}#app.fullscreen .main-container{height:100%}#app.fullscreen .center-canvas{width:100%}.left-sidebar,.right-sidebar{width:var(--sidebar-width);background-color:var(--color-surface);border-right:1px solid var(--color-border);display:flex;flex-direction:column;overflow:hidden;transition:transform .3s,width .3s}.right-sidebar{border-right:none;border-left:1px solid var(--color-border)}.left-sidebar.hidden{transform:translate(-100%);width:0;border-right:none}.right-sidebar.hidden{transform:translate(100%);width:0;border-left:none}.center-canvas{flex:1;display:flex;flex-direction:column;background-color:var(--color-canvas-bg);overflow:hidden}.canvas-toolbar{display:flex;align-items:center;padding:var(--spacing-sm) var(--spacing-md);background-color:var(--color-surface);border-bottom:1px solid var(--color-border);gap:var(--spacing-sm)}.canvas-toolbar.hidden{display:none}.canvas-content{flex:1;overflow:auto;position:relative}.canvas-viewport{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);background-color:var(--color-background);box-shadow:var(--shadow-lg);transition:width .3s,height .3s}.canvas-viewport.with-grid{background-image:radial-gradient(circle,var(--color-grid-dot) 1px,transparent 1px);background-size:20px 20px}.canvas-empty-state{display:flex;align-items:center;justify-content:center;width:100%;height:100%;color:var(--color-text-secondary);font-size:var(--font-size-lg);-webkit-user-select:none;user-select:none}.sidebar-section{display:flex;flex-direction:column;border-bottom:1px solid var(--color-border);flex-shrink:0}.sidebar-section:last-child{flex:1;min-height:0}.sidebar-section.collapsed .section-content{display:none}.section-content{padding:var(--spacing-md);overflow-y:auto;min-height:0}.element-list-item{display:flex;align-items:center;padding:var(--spacing-sm) var(--spacing-md);border:1px solid var(--color-border);border-radius:var(--radius-sm);margin-bottom:var(--spacing-sm);cursor:grab;background-color:var(--color-background);transition:background-color .2s,transform .1s}.element-list-item:hover{background-color:var(--color-surface-hover)}.element-list-item:active{cursor:grabbing;transform:scale(.98)}.element-list-item .icon{margin-right:var(--spacing-sm);color:var(--color-primary)}.element-list-item .label{flex:1;font-size:var(--font-size-sm);font-weight:500}.structure-tree{list-style:none;padding:0;margin:0}.structure-tree-item{display:flex;align-items:center;padding:var(--spacing-xs) var(--spacing-sm);cursor:pointer;border-radius:var(--radius-sm);font-size:var(--font-size-sm);-webkit-user-select:none;user-select:none;transition:background-color .2s}.structure-tree-item:hover{background-color:var(--color-surface-hover)}.structure-tree-item.selected{background-color:var(--color-primary);color:#fff}.structure-tree-item .toggle{width:16px;height:16px;margin-right:var(--spacing-xs);cursor:pointer}.structure-tree-item .icon{margin-right:var(--spacing-xs)}.structure-tree-item .label{flex:1}.structure-tree-item.has-children>.toggle:before{content:"▶";display:block;transition:transform .2s}.structure-tree-item.has-children.expanded>.toggle:before{transform:rotate(90deg)}.structure-tree-children{padding-left:var(--spacing-lg)}.context-menu{position:fixed;background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);padding:var(--spacing-xs);z-index:1000;min-width:180px}.context-menu.hidden{display:none}.context-menu-item{display:flex;align-items:center;padding:var(--spacing-sm) var(--spacing-md);cursor:pointer;border-radius:var(--radius-sm);font-size:var(--font-size-sm);transition:background-color .2s;gap:var(--spacing-sm)}.context-menu-item:hover{background-color:var(--color-surface-hover)}.context-menu-item.danger:hover{background-color:var(--color-error);color:#fff}.context-menu-item .shortcut{margin-left:auto;font-size:var(--font-size-xs);color:var(--color-text-secondary)}.context-menu-divider{height:1px;background-color:var(--color-border);margin:var(--spacing-xs) 0}.parameter-group{margin-bottom:var(--spacing-lg)}.parameter-label{display:block;margin-bottom:var(--spacing-xs);font-size:var(--font-size-xs);font-weight:600;color:var(--color-text-secondary);text-transform:uppercase;letter-spacing:.5px}.parameter-row{display:flex;gap:var(--spacing-sm);margin-bottom:var(--spacing-sm)}.parameter-row .input-field{flex:1}.parameter-actions{display:flex;gap:var(--spacing-xs)}.parameter-action-btn{width:24px;height:24px;padding:0;border:1px solid var(--color-border);background-color:var(--color-background);color:var(--color-text-secondary);border-radius:var(--radius-sm);cursor:pointer;font-size:var(--font-size-xs);display:flex;align-items:center;justify-content:center;transition:background-color .2s}.parameter-action-btn:hover{background-color:var(--color-surface-hover)}.parameter-action-btn.active{background-color:var(--color-primary);color:#fff;border-color:var(--color-primary)}.empty-details{display:flex;align-items:center;justify-content:center;height:100%;color:var(--color-text-secondary);font-size:var(--font-size-sm);text-align:center;padding:var(--spacing-xl)}.property-section{display:flex;flex-direction:column;margin-bottom:var(--spacing-md)}.property-section.collapsed .property-section-content{display:none}.property-section .section-header{cursor:pointer;padding:var(--spacing-xs) var(--spacing-sm);background-color:transparent;border-bottom:1px solid var(--color-border);margin-bottom:var(--spacing-sm);display:flex;align-items:center;gap:var(--spacing-xs);transition:background-color .2s}.property-section .section-header:hover{background-color:var(--color-surface-hover)}.property-section .section-header .toggle-icon{transition:transform .2s;font-size:10px}.property-section.collapsed .section-header .toggle-icon{transform:rotate(-90deg)}.property-section-content{display:flex;flex-direction:column;padding:0 var(--spacing-sm)}.exit-fullscreen-btn{position:fixed;top:var(--spacing-md);right:var(--spacing-md);width:48px;height:48px;border:none;background-color:var(--color-surface);color:var(--color-text-primary);border-radius:50%;font-size:24px;cursor:pointer;box-shadow:var(--shadow-lg);z-index:1000;display:flex;align-items:center;justify-content:center;transition:background-color .2s,transform .2s}.exit-fullscreen-btn:hover{background-color:var(--color-surface-hover);transform:scale(1.05)}.exit-fullscreen-btn:active{transform:scale(.95)}.element-container{position:relative;display:flex;min-width:20px;min-height:20px;transition:outline .2s,background-color .2s}.element-container.show-outline{outline:1px solid var(--color-border);outline-offset:-1px}.element-container.selected{outline:2px solid var(--color-outline)!important;outline-offset:-2px;background-color:var(--color-selection)}.element-container:hover{outline:1px solid var(--color-primary);outline-offset:-1px}.vertical-layout-content,.horizontal-layout-content,.stack-layout-content{flex:1;pointer-events:none}.layout-placeholder{display:flex;align-items:center;justify-content:center;width:100%;min-height:100px;border:2px dashed var(--color-border);border-radius:var(--radius-md);color:var(--color-text-secondary);font-size:var(--font-size-sm);background-color:var(--color-surface);pointer-events:none}.image-element{pointer-events:none;-webkit-user-select:none;user-select:none}.element-container.dragging{opacity:.5}.element-container.drag-over{outline:3px dashed var(--color-primary)!important;outline-offset:-3px;background-color:#2196f326!important}.element-container.drag-over .vertical-layout-content,.element-container.drag-over .horizontal-layout-content,.element-container.drag-over .stack-layout-content,.element-container.drag-over *{pointer-events:none}