diff --git a/components/canvas/RealtimeCanvasDialog.tsx b/components/canvas/RealtimeCanvasDialog.tsx
index 0aa1b5795..7f30eb1b7 100644
--- a/components/canvas/RealtimeCanvasDialog.tsx
+++ b/components/canvas/RealtimeCanvasDialog.tsx
@@ -34,7 +34,6 @@ import {
   Upload,
   ChevronDown,
   ChevronUp,
-  RefreshCw,
   Sparkles,
   Save,
   Trash2,
@@ -115,7 +114,6 @@ const FALLBACK_PROMPT =
 const CANVAS_BACKGROUND = "#ffffff";
 const DEFAULT_BRUSH_COLOR = "#18181b";
 const DRAW_LAYER_ID = "__draw_layer__";
-const CANVAS_BACKGROUND_PRESETS = ["#ffffff", "#f4f4f5", "#fdf2f8", "#ecfeff", "#f0fdf4"] as const;
 const REALTIME_PROJECTS_STORAGE_KEY = "ai-chatbot:realtime-canvas-projects";
 
 function cloneImageLayers(layers: ImageLayer[]) {
@@ -2208,17 +2206,6 @@ export function RealtimeCanvasDialog({
     [importFilesAsLayers]
   );
 
-  const handleCanvasBackgroundChange = useCallback(
-    (nextColor: string) => {
-      canvasBackgroundRef.current = nextColor;
-      setCanvasBackground(nextColor);
-      saveHistory(undefined, nextColor);
-      markCanvasDirty(null);
-      scheduleFlush(true);
-    },
-    [markCanvasDirty, saveHistory, scheduleFlush]
-  );
-
   const handleDownloadCanvas = useCallback(async () => {
     const compositeCanvas = await buildCompositeCanvas();
     if (!compositeCanvas) return;
@@ -2357,18 +2344,6 @@ export function RealtimeCanvasDialog({
                 >
                   <Plus className="h-4 w-4" />
                 </Button>
-                {standalone ? (
-                  <Button
-                    type="button"
-                    size="icon"
-                    variant="ghost"
-                    className="h-8 w-8 rounded-full"
-                    onClick={() => onOpenChange(false)}
-                    title="返回画布"
-                  >
-                    <X className="h-4 w-4" />
-                  </Button>
-                ) : null}
               </div>
 
               <div className="flex h-10 shrink-0 items-center gap-0.5 rounded-full border border-black/10 bg-white px-1">
@@ -2379,7 +2354,10 @@ export function RealtimeCanvasDialog({
                     "h-8 w-8 rounded-full text-zinc-600 hover:bg-zinc-100",
                     brushMode === "brush" && "bg-black text-white hover:bg-black"
                   )}
-                  onClick={() => setBrushMode("brush")}
+                  onClick={() => {
+                    setSelectedLayerId(DRAW_LAYER_ID);
+                    setBrushMode("brush");
+                  }}
                   title="画笔"
                 >
                   <Paintbrush className="h-5 w-5" />
@@ -2391,7 +2369,10 @@ export function RealtimeCanvasDialog({
                     "h-8 w-8 rounded-full text-zinc-600 hover:bg-zinc-100",
                     brushMode === "eraser" && "bg-black text-white hover:bg-black"
                   )}
-                  onClick={() => setBrushMode("eraser")}
+                  onClick={() => {
+                    setSelectedLayerId(DRAW_LAYER_ID);
+                    setBrushMode("eraser");
+                  }}
                   title="橡皮"
                 >
                   <Eraser className="h-5 w-5" />
@@ -2403,7 +2384,10 @@ export function RealtimeCanvasDialog({
                     "h-8 w-8 rounded-full text-zinc-600 hover:bg-zinc-100",
                     brushMode === "rect" && "bg-black text-white hover:bg-black"
                   )}
-                  onClick={() => setBrushMode("rect")}
+                  onClick={() => {
+                    setSelectedLayerId(DRAW_LAYER_ID);
+                    setBrushMode("rect");
+                  }}
                   title="矩形"
                 >
                   <Square className="h-5 w-5" />
@@ -2415,7 +2399,10 @@ export function RealtimeCanvasDialog({
                     "h-8 w-8 rounded-full text-zinc-600 hover:bg-zinc-100",
                     brushMode === "circle" && "bg-black text-white hover:bg-black"
                   )}
-                  onClick={() => setBrushMode("circle")}
+                  onClick={() => {
+                    setSelectedLayerId(DRAW_LAYER_ID);
+                    setBrushMode("circle");
+                  }}
                   title="圆形"
                 >
                   <CircleIcon className="h-5 w-5" />
@@ -2427,7 +2414,10 @@ export function RealtimeCanvasDialog({
                     "h-8 w-8 rounded-full text-zinc-600 hover:bg-zinc-100",
                     brushMode === "line" && "bg-black text-white hover:bg-black"
                   )}
-                  onClick={() => setBrushMode("line")}
+                  onClick={() => {
+                    setSelectedLayerId(DRAW_LAYER_ID);
+                    setBrushMode("line");
+                  }}
                   title="直线"
                 >
                   <Slash className="h-5 w-5" />
@@ -2471,21 +2461,6 @@ export function RealtimeCanvasDialog({
                     thumbClassName="h-5 w-5 border border-zinc-300 bg-white shadow-sm"
                   />
                 </div>
-                <div className="flex h-8 items-center gap-1 rounded-full border border-black/10 bg-white px-2">
-                  {CANVAS_BACKGROUND_PRESETS.map((color) => (
-                    <button
-                      key={color}
-                      type="button"
-                      className={cn(
-                        "h-5 w-5 rounded-full border border-black/15 transition-all",
-                        canvasBackground === color && "scale-110 ring-2 ring-black/20"
-                      )}
-                      style={{ backgroundColor: color }}
-                      onClick={() => handleCanvasBackgroundChange(color)}
-                      title="画布底色"
-                    />
-                  ))}
-                </div>
               </div>
 
               <div className="flex h-10 shrink-0 items-center gap-0.5 rounded-full border border-black/10 bg-white px-1">
@@ -2498,15 +2473,6 @@ export function RealtimeCanvasDialog({
                 >
                   <Upload className="h-5 w-5" />
                 </Button>
-                <Button
-                  size="icon"
-                  variant="ghost"
-                  className="h-8 w-8 rounded-full text-zinc-600 hover:bg-zinc-100"
-                  onClick={clearSketch}
-                  title="清空"
-                >
-                  <Trash2 className="h-5 w-5" />
-                </Button>
                 <Button
                   size="icon"
                   variant="ghost"
@@ -2536,17 +2502,23 @@ export function RealtimeCanvasDialog({
                 >
                   <Download className="h-5 w-5" />
                 </Button>
-                <Button
-                  size="icon"
-                  variant="ghost"
-                  className="h-8 w-8 rounded-full text-zinc-600 hover:bg-zinc-100"
-                  onClick={forceReconnect}
-                  title="重连"
-                >
-                  <RefreshCw className="h-5 w-5" />
-                </Button>
               </div>
 
+              {standalone ? (
+                <div className="flex h-10 shrink-0 items-center rounded-full border border-black/10 bg-white px-1">
+                  <Button
+                    type="button"
+                    size="icon"
+                    variant="ghost"
+                    className="h-8 w-8 rounded-full"
+                    onClick={() => onOpenChange(false)}
+                    title="关闭页面"
+                  >
+                    <X className="h-4 w-4" />
+                  </Button>
+                </div>
+              ) : null}
+
             </div>
           </div>
         </div>
@@ -2690,7 +2662,7 @@ export function RealtimeCanvasDialog({
                     />
                 </div>
              </div>
-             <div className="absolute left-3 top-28 bottom-4 z-10 flex w-[4.9rem] max-w-[20vw] flex-col rounded-[20px] border border-black/10 bg-white/96 p-2 shadow-xl">
+             <div className="absolute left-3 top-28 bottom-4 z-10 flex w-[4.4rem] max-w-[18vw] flex-col rounded-[18px] border border-black/10 bg-white/96 p-1.5 shadow-xl">
                 <div className="flex items-center justify-between border-b border-black/10 pb-2">
                   <div className="flex h-8 w-8 items-center justify-center rounded-full bg-zinc-50 text-zinc-900">
                     <Layers3 className="h-4 w-4" />
@@ -2699,22 +2671,7 @@ export function RealtimeCanvasDialog({
                     {imageLayers.length} 张
                   </span>
                 </div>
-                <div className="mt-2 flex-1 space-y-2 overflow-y-auto pr-0.5">
-                  <button
-                    type="button"
-                    className={cn(
-                      "flex w-full flex-col items-center gap-1 rounded-2xl border px-1.5 py-2 text-center transition",
-                      selectedLayerId === DRAW_LAYER_ID
-                        ? "border-black/20 bg-zinc-900 text-white shadow-sm"
-                        : "border-dashed border-black/10 bg-zinc-50 text-zinc-900 hover:bg-zinc-100"
-                    )}
-                    onClick={() => setSelectedLayerId(DRAW_LAYER_ID)}
-                  >
-                    <Paintbrush className={cn("h-4 w-4", selectedLayerId === DRAW_LAYER_ID ? "text-white" : "text-zinc-700")} />
-                    <div className={cn("text-[10px] font-medium", selectedLayerId === DRAW_LAYER_ID ? "text-white" : "text-zinc-600")}>
-                      画笔
-                    </div>
-                  </button>
+                <div className="mt-2 flex-1 space-y-1.5 overflow-y-auto pr-0.5">
                   {imageLayers.length === 0 ? (
                     <div className="rounded-2xl border border-dashed border-black/10 px-1 py-4 text-center text-[10px] leading-4 text-zinc-400">
                       暂无图层