diff --git a/apps/ai-game-creator-shell/src/styles.css b/apps/ai-game-creator-shell/src/styles.css
index 6c0eb6197..8fd623592 100644
--- a/apps/ai-game-creator-shell/src/styles.css
+++ b/apps/ai-game-creator-shell/src/styles.css
@@ -1090,10 +1090,17 @@ textarea {
 .launcher-agent-chat-messages .message {
   max-width: min(720px, 88%);
   margin: 0;
+  padding: 9px 12px;
+  border-radius: 14px;
+  line-height: 1.55;
 }
 
 .launcher-agent-chat-messages .message--user {
   justify-self: end;
+  border: 1px solid #d8c4a8;
+  border-radius: 14px 14px 4px;
+  background: #fff7ed;
+  color: #8a4b08;
 }
 
 .launcher-agent-chat-waiting {
@@ -4419,6 +4426,27 @@ h2 {
   border: 1px solid #dde3ee;
 }
 
+.agent-conversation-list .message {
+  width: fit-content;
+  max-width: min(88%, 720px);
+  margin: 0;
+  padding: 9px 12px;
+  border-radius: 14px;
+  line-height: 1.55;
+}
+
+.agent-conversation-list .message + .message {
+  margin-top: 10px;
+}
+
+.agent-conversation-list .message--user {
+  margin-left: auto;
+  border: 1px solid #d8c4a8;
+  border-radius: 14px 14px 4px;
+  background: #fff7ed;
+  color: #8a4b08;
+}
+
 .agent-memory-box {
   display: grid;
   gap: 6px;
@@ -6227,6 +6255,35 @@ iframe.preview-frame {
   scrollbar-gutter: stable;
 }
 
+/* Keep the transcript readable while making the user's turns immediately
+   distinct from the assistant stream, like a conventional chat surface. */
+.game-workbench-chat .project-supervisor-message-list .message {
+  width: fit-content;
+  max-width: min(88%, 720px);
+  margin: 0;
+  padding: 9px 12px;
+  border-radius: 14px;
+  line-height: 1.55;
+}
+
+.game-workbench-chat .project-supervisor-message-list .message + .message {
+  margin-top: 10px;
+}
+
+.game-workbench-chat .project-supervisor-message-list .message--user {
+  margin-left: auto;
+  border: 1px solid var(--platform-button-primary-border);
+  border-radius: 14px 14px 4px;
+  background: var(--platform-warm-bg);
+  color: var(--platform-text-base);
+}
+
+.game-workbench-chat
+  .project-supervisor-message-list
+  > .project-supervisor-process-card {
+  width: 100%;
+}
+
 .game-workbench-chat .agent-runtime-status {
   max-height: clamp(120px, 24dvh, 240px);
   min-height: 0;
diff --git a/apps/ai-game-creator-shell/tests/appSurface/project-development.suite.ts b/apps/ai-game-creator-shell/tests/appSurface/project-development.suite.ts
index 7d911c847..9507775bb 100644
--- a/apps/ai-game-creator-shell/tests/appSurface/project-development.suite.ts
+++ b/apps/ai-game-creator-shell/tests/appSurface/project-development.suite.ts
@@ -3482,6 +3482,45 @@ export function registerProjectWorkbenchFoundationTests() {
     );
   });
 
+  it('keeps workbench chat bubbles aligned without shrinking process cards', () => {
+    const styles = readFileSync(
+      resolve(process.cwd(), 'apps/ai-game-creator-shell/src/styles.css'),
+      'utf8',
+    );
+    const messageListRule =
+      styles.match(
+        /\.game-workbench-chat \.project-supervisor-message-list\s*\{([^}]*)\}/s,
+      )?.[1] ?? '';
+    const messageRule =
+      styles.match(
+        /\.game-workbench-chat \.project-supervisor-message-list \.message\s*\{([^}]*)\}/s,
+      )?.[1] ?? '';
+    const userMessageRule =
+      styles.match(
+        /\.game-workbench-chat \.project-supervisor-message-list \.message--user\s*\{([^}]*)\}/s,
+      )?.[1] ?? '';
+    const processCardRules = Array.from(
+      styles.matchAll(
+        /\.game-workbench-chat\s+\.project-supervisor-message-list\s*>\s*\.project-supervisor-process-card\s*\{([^}]*)\}/gs,
+      ),
+      (match) => match[1],
+    );
+
+    expect(messageListRule).not.toBe('');
+    expect(messageListRule).not.toContain('display: flex;');
+    expect(messageListRule).not.toContain('align-items:');
+    expect(messageRule).toContain('width: fit-content;');
+    expect(messageRule).toContain('max-width: min(88%, 720px);');
+    expect(userMessageRule).not.toBe('');
+    expect(userMessageRule).toContain('margin-left: auto;');
+    expect(userMessageRule).not.toContain('align-self:');
+    expect(userMessageRule).toContain('border-radius: 14px 14px 4px;');
+    expect(userMessageRule).toContain('background: var(--platform-warm-bg);');
+    expect(userMessageRule).toContain('color: var(--platform-text-base);');
+    expect(processCardRules).toHaveLength(1);
+    expect(processCardRules[0]).toContain('width: 100%;');
+  });
+
   it('enables the run presentation and renders registered images in the resource viewer', async () => {
     const manifest = createGameCreationAppManifest(
       'workbench-runnable',
@@ -9279,6 +9318,7 @@ export function registerProjectSupervisorSurfaceTests() {
     });
     const waitingProcessCard =
       within(directMessageList).getByLabelText('陶泥儿执行过程');
+    expect(waitingProcessCard.parentElement).toBe(directMessageList);
     expect(
       within(waitingProcessCard).getByText('已发送消息，正在等待陶泥儿回复'),
     ).not.toBeNull();
diff --git a/apps/ai-game-creator-shell/tests/workbenchThemeContrast.test.ts b/apps/ai-game-creator-shell/tests/workbenchThemeContrast.test.ts
new file mode 100644
index 000000000..8968364ec
--- /dev/null
+++ b/apps/ai-game-creator-shell/tests/workbenchThemeContrast.test.ts
@@ -0,0 +1,148 @@
+import { readFileSync } from 'node:fs';
+import { resolve } from 'node:path';
+
+import { describe, expect, it } from 'vitest';
+
+type Rgba = readonly [number, number, number, number];
+
+const themePath = resolve(process.cwd(), 'packages/shared/src/theme.css');
+
+function getCssBlock(source: string, selector: string) {
+  const selectorIndex = source.indexOf(selector);
+  expect(selectorIndex, `${selector} should exist`).toBeGreaterThanOrEqual(0);
+
+  const openBraceIndex = source.indexOf('{', selectorIndex);
+  let depth = 0;
+  for (let index = openBraceIndex; index < source.length; index += 1) {
+    const char = source[index];
+    if (char === '{') {
+      depth += 1;
+    } else if (char === '}') {
+      depth -= 1;
+      if (depth === 0) {
+        return source.slice(openBraceIndex + 1, index);
+      }
+    }
+  }
+
+  throw new Error(`${selector} block is not closed`);
+}
+
+function getCssVariable(block: string, variableName: string) {
+  const match = block.match(new RegExp(`${variableName}:\\s*([^;]+);`));
+  expect(match, `${variableName} should exist`).not.toBeNull();
+  return match![1].trim();
+}
+
+function parseCssColor(source: string): Rgba {
+  const value = source.trim();
+  const hex = value.match(/^#([\da-f]{6})$/i);
+  if (hex) {
+    return [
+      Number.parseInt(hex[1].slice(0, 2), 16),
+      Number.parseInt(hex[1].slice(2, 4), 16),
+      Number.parseInt(hex[1].slice(4, 6), 16),
+      1,
+    ];
+  }
+
+  const functional = value.match(/^rgba?\((.*)\)$/i);
+  if (!functional) {
+    throw new Error(`unsupported color: ${value}`);
+  }
+  const parts = functional[1]
+    .replace('/', ' ')
+    .split(/[,\s]+/)
+    .filter(Boolean);
+  return [
+    Number(parts[0]),
+    Number(parts[1]),
+    Number(parts[2]),
+    parts[3] === undefined ? 1 : Number(parts[3]),
+  ];
+}
+
+function compositeColor(foreground: Rgba, background: Rgba): Rgba {
+  const alpha = foreground[3] + background[3] * (1 - foreground[3]);
+  return [
+    (foreground[0] * foreground[3] +
+      background[0] * background[3] * (1 - foreground[3])) /
+      alpha,
+    (foreground[1] * foreground[3] +
+      background[1] * background[3] * (1 - foreground[3])) /
+      alpha,
+    (foreground[2] * foreground[3] +
+      background[2] * background[3] * (1 - foreground[3])) /
+      alpha,
+    alpha,
+  ];
+}
+
+function contrastRatio(first: Rgba, second: Rgba) {
+  const luminance = ([red, green, blue]: Rgba) => {
+    const channels = [red, green, blue].map((channel) => {
+      const value = channel / 255;
+      return value <= 0.04045
+        ? value / 12.92
+        : ((value + 0.055) / 1.055) ** 2.4;
+    });
+    return channels[0] * 0.2126 + channels[1] * 0.7152 + channels[2] * 0.0722;
+  };
+
+  const firstLuminance = luminance(first);
+  const secondLuminance = luminance(second);
+  return (
+    (Math.max(firstLuminance, secondLuminance) + 0.05) /
+    (Math.min(firstLuminance, secondLuminance) + 0.05)
+  );
+}
+
+describe('workbench theme contrast', () => {
+  it('keeps warm user bubbles above WCAG AA text contrast', () => {
+    const css = readFileSync(themePath, 'utf8');
+    const light = getCssBlock(css, '.platform-theme--light');
+    const dark = getCssBlock(css, '.platform-theme--dark');
+    const bubbleBackground = (theme: string, underlay: Rgba) =>
+      compositeColor(
+        parseCssColor(getCssVariable(theme, '--platform-warm-bg')),
+        compositeColor(
+          parseCssColor(getCssVariable(theme, '--platform-input-fill')),
+          underlay,
+        ),
+      );
+
+    // Pure black is darker than any real light-theme workbench underlay.
+    const lightContrast = contrastRatio(
+      parseCssColor(getCssVariable(light, '--platform-text-base')),
+      bubbleBackground(light, [0, 0, 0, 1]),
+    );
+
+    const darkBodyFill = getCssVariable(dark, '--platform-body-fill');
+    const darkPanelFill = getCssVariable(dark, '--platform-desktop-panel-fill');
+    expect(darkBodyFill).toContain('rgba(129, 140, 248, 0.2)');
+    expect(darkBodyFill).toContain('rgba(59, 130, 246, 0.12)');
+    expect(darkBodyFill).toContain('rgba(34, 211, 238, 0.08)');
+    expect(darkBodyFill).toContain('#13151c');
+    expect(darkPanelFill).toContain('rgba(255, 255, 255, 0.05)');
+    // Conservative upper bound: the brightest body stop, every radial peak,
+    // and the brightest desktop-panel overlay are composed at full strength.
+    const darkBrightestUnderlay = compositeColor(
+      [255, 255, 255, 0.05],
+      compositeColor(
+        [129, 140, 248, 0.2],
+        compositeColor(
+          [59, 130, 246, 0.12],
+          compositeColor([34, 211, 238, 0.08], [19, 21, 28, 1]),
+        ),
+      ),
+    );
+    const darkContrast = contrastRatio(
+      parseCssColor(getCssVariable(dark, '--platform-text-base')),
+      bubbleBackground(dark, darkBrightestUnderlay),
+    );
+
+    expect(contrastRatio([0, 0, 0, 1], [255, 255, 255, 1])).toBeCloseTo(21);
+    expect(lightContrast).toBeGreaterThanOrEqual(4.5);
+    expect(darkContrast).toBeGreaterThanOrEqual(4.5);
+  });
+});
diff --git a/docs/prd/【AI游戏创作】项目开发工作台PRD-2026-07-20.md b/docs/prd/【AI游戏创作】项目开发工作台PRD-2026-07-20.md
index bf17da26f..1210b16e9 100644
--- a/docs/prd/【AI游戏创作】项目开发工作台PRD-2026-07-20.md
+++ b/docs/prd/【AI游戏创作】项目开发工作台PRD-2026-07-20.md
@@ -1,6 +1,6 @@
 # AI 游戏创作项目开发工作台 PRD
 
-更新时间：`2026-08-15`（项目管理页紧凑表格与桌面可用性收口；资源卡预览、分区布局、非破坏性资源编辑及 Godot 双根合同保持不变）
+更新时间：`2026-08-23`（右侧 Supervisor 对话气泡、可访问对比度与过程卡布局收口；资源卡预览、分区布局、非破坏性资源编辑及 Godot 双根合同保持不变）
 
 ## 1. 产品定位
 
@@ -108,6 +108,7 @@
 - 第一批共享 chrome 固定覆盖画布动作按钮、工具栏、工具分组和分隔符。按钮的默认、悬停、键盘焦点、选中、禁用和主次色语义由共享层表达；宿主只提供图标、文案、事件与业务禁用条件。
 - 主站账号、钱包、服务端项目、云端素材库和生成面板仍留在网站宿主；客户端本地项目、manifest、Runtime、审批、草稿、生成与正式提交仍留在 Tauri 宿主。共享视觉组件不得读取这些业务事实。
 - 客户端 UI 对齐采用“同视觉、同组件、保留四区布局”，不复制主站整页布局。资源总览、运行视图和 Supervisor 对话继续是 Game Agent 工作台独有语义。
+- 右侧 Supervisor 对话中，用户消息使用右对齐、最大宽度受限的主题暖色气泡，assistant 消息保持左对齐；消息换行不得产生水平溢出，执行过程卡继续占满消息区可用宽度。气泡正文在 light / dark 平台主题下均须满足 WCAG AA 普通文本 `4.5:1` 对比度。
 - 客户端正式产品仍只按最小 `1280×720` 横屏合同交付，并保留 `1280×800` 默认窗口与既有基线验收；更窄浏览器样式只负责不崩溃和开发兼容，不改成移动端创作工作台。
 - 普通用户界面不默认展示内部错误码或本机绝对路径，也不展示 External Editor Base URL 或 Developer API Key；官方服务地址由客户端构建固定，远端编辑自动使用当前陶泥儿登录态。仅独立 standalone game-chat release 或显式高级自定义模式在隔离配置页维护 External v1 URL/Key，确需诊断的信息进入受控详情或开发模式。
 - 素材画布的“素材名称”是用户可编辑的正式输出名称；“资源用途”是 manifest subtype，不向普通用户开放自由文本。新增资源默认“普通游戏美术”，可从普通游戏美术、统一视觉规范、游戏界面原型、核心美术图集四项中选择；精修资源继承源用途且不可改。导出格式继续限定 PNG/JPEG/WebP。工具动作与保存设置分层展示，“保存到项目”在 `1280×800` 和窄容器中都必须完整可见。