diff --git a/components/canvas/chat-panel/canvas-detail-config.ts b/components/canvas/chat-panel/canvas-detail-config.ts
index a2a372ac1..9b2071f06 100644
--- a/components/canvas/chat-panel/canvas-detail-config.ts
+++ b/components/canvas/chat-panel/canvas-detail-config.ts
@@ -284,7 +284,7 @@ export function extractFirstNumber(value: string, fallback: number): number {
 }
 
 export function extractFontWeight(value: string, fallback = "600"): string {
-  const matched = String(value || "").match(/(?:\/|weight[:：]?\s*)(\d{3})/i);
+  const matched = String(value || "").match(/(?:\/\s*|weight[:：]?\s*)(\d{3})/i);
   if (!matched) return fallback;
   return matched[1] || fallback;
 }
@@ -296,7 +296,7 @@ export function sanitizeDetailImageModelPrompt(prompt: string): string {
     .filter(Boolean)
     .map((line) => {
       if (
-        /^(字体规范|标题规范|副标题规范|正文规范|版式规范|安全区|留白节奏|Typography|Layout|Palette|固定字体锁定|固定副标题锁定|固定正文锁定|固定排版安全区|固定留白节奏)/i.test(
+        /^(字体规范|标题规范|副标题规范|正文规范|版式规范|留白节奏|Typography|Layout|Palette|固定字体锁定|固定副标题锁定|固定正文锁定|固定排版安全区|固定留白节奏)/i.test(
           line
         )
       ) {
@@ -309,9 +309,9 @@ export function sanitizeDetailImageModelPrompt(prompt: string): string {
   let result = filteredLines.join("\n");
 
   const literalReplacements: Array<[RegExp, string]> = [
+    [/输出为竖版电商详情图，尺寸固定\s*\d+\s*x\s*\d+\s*(?:像素|pixels?)。?/gi, "输出为竖版电商详情图。"],
     [/画布固定(?:竖版)?\s*\d+\s*x\s*\d+\s*(?:像素|pixels?)。?/gi, "画布为竖版详情页构图。"],
     [/尺寸固定\s*\d+\s*x\s*\d+\s*(?:像素|pixels?)。?/gi, "尺寸为竖版详情页比例。"],
-    [/输出为竖版电商详情图，尺寸固定\s*\d+\s*x\s*\d+\s*(?:像素|pixels?)。?/gi, "输出为竖版电商详情图。"],
     [/y\s*=\s*\d+\s*[-~～]\s*\d+/gi, "顶部标题安全区"],
     [/左右边距\s*\d+\s*px/gi, "左右留白充足"],
     [/模块间距\s*\d+\s*px/gi, "模块间距均匀"],
diff --git a/tests/routes/canvas-chat-helpers.test.ts b/tests/routes/canvas-chat-helpers.test.ts
index 7f1edd679..b58476089 100644
--- a/tests/routes/canvas-chat-helpers.test.ts
+++ b/tests/routes/canvas-chat-helpers.test.ts
@@ -11,6 +11,21 @@ import {
   buildDetailReviewAppendMarkdown,
   buildDetailReviewPlans,
 } from "@/components/canvas/chat-panel/canvas-detail-markdown";
+import {
+  DETAIL_BUNDLE_SLOT_INDEXES,
+  DETAIL_GENERATION_MODE_OPTIONS,
+  DETAIL_MODEL_SLOT_INDEX,
+  DETAIL_PRODUCT_SLOT_INDEXES,
+  DETAIL_SLOT_CONFIGS,
+  DETAIL_TARGET_HEIGHT,
+  DETAIL_TARGET_WIDTH,
+  extractDetailFrameCount,
+  extractFirstNumber,
+  extractFontWeight,
+  normalizeDetailGenerationMode,
+  sanitizeDetailImageModelPrompt,
+  splitDetailKeywords,
+} from "@/components/canvas/chat-panel/canvas-detail-config";
 import type { ChatMessage } from "@/lib/types";
 
 test.describe("canvas chat pure helpers", () => {
@@ -119,6 +134,67 @@ test.describe("canvas chat pure helpers", () => {
     expect(plans[0]?.imagePrompt).toContain("无线吸尘器");
   });
 
+  test("keeps detail slot indexes and generation mode options stable", () => {
+    expect(DETAIL_TARGET_WIDTH).toBe(790);
+    expect(DETAIL_TARGET_HEIGHT).toBe(1300);
+    expect(DETAIL_SLOT_CONFIGS.map((slot) => slot.role)).toEqual([
+      "product",
+      "product",
+      "product",
+      "product",
+      "product",
+      "model",
+      "bundle",
+      "bundle",
+      "bundle",
+    ]);
+    expect(DETAIL_PRODUCT_SLOT_INDEXES).toEqual([0, 1, 2, 3, 4]);
+    expect(DETAIL_MODEL_SLOT_INDEX).toBe(5);
+    expect(DETAIL_BUNDLE_SLOT_INDEXES).toEqual([6, 7, 8]);
+    expect(DETAIL_GENERATION_MODE_OPTIONS.map((option) => option.value)).toEqual([
+      "classic",
+      "agent_layout",
+    ]);
+  });
+
+  test("normalizes detail config parser helpers defensively", () => {
+    expect(normalizeDetailGenerationMode("agent_layout")).toBe("agent_layout");
+    expect(normalizeDetailGenerationMode("unknown")).toBe("classic");
+    expect(extractDetailFrameCount("需要 23 张详情页")).toBe(20);
+    expect(extractDetailFrameCount("需要 2 屏")).toBe(5);
+    expect(extractDetailFrameCount("没有明确数量")).toBe(15);
+    expect(extractFirstNumber("标题 64px / 700", 32)).toBe(64);
+    expect(extractFirstNumber("无数字", 32)).toBe(32);
+    expect(extractFontWeight("主标题 64px / 700 / 行高1.15", "600")).toBe("700");
+    expect(extractFontWeight("weight: 500", "600")).toBe("500");
+    expect(extractFontWeight("无权重", "600")).toBe("600");
+    expect(splitDetailKeywords("强吸力，轻量; 低噪音 | 易清洁", 3)).toEqual([
+      "强吸力",
+      "轻量",
+      "低噪音",
+    ]);
+  });
+
+  test("sanitizes detail image model prompts away from pixel-locked layout instructions", () => {
+    const sanitized = sanitizeDetailImageModelPrompt(
+      [
+        "字体规范：主标题 64px / 700 / 行高1.15",
+        "输出为竖版电商详情图，尺寸固定 790x1300 像素。",
+        "安全区 y=64~360，左右边距56px，模块间距24px。",
+        "商业摄影质感，留出清晰文案排版区，不要水印。",
+        "突出产品真实材质与使用场景。",
+      ].join("\n")
+    );
+
+    expect(sanitized).not.toContain("790x1300");
+    expect(sanitized).not.toContain("64px");
+    expect(sanitized).not.toContain("56px");
+    expect(sanitized).toContain("输出为竖版电商详情图。");
+    expect(sanitized).toContain("顶部标题安全区");
+    expect(sanitized).toContain("左右留白充足");
+    expect(sanitized).toContain("突出产品真实材质与使用场景。");
+  });
+
   test("builds stable detail result and appended review markdown", () => {
     const markdown = buildDetailResultMarkdown({
       generationMode: "agent_layout",