diff --git a/apps/ai-game-creator-shell/src/features/runtime-config/RuntimeConfigDialog.tsx b/apps/ai-game-creator-shell/src/features/runtime-config/RuntimeConfigDialog.tsx
index 2f8007f69..67c08ccb5 100644
--- a/apps/ai-game-creator-shell/src/features/runtime-config/RuntimeConfigDialog.tsx
+++ b/apps/ai-game-creator-shell/src/features/runtime-config/RuntimeConfigDialog.tsx
@@ -72,7 +72,7 @@ const defaultRuntimeConfigDraft: GameCreatorAppConfig = {
     model: 'gpt-5.6-sol',
     apiKind: 'openai_responses',
     reasoningEffort: 'max',
-    stream: false,
+    stream: true,
     webSearchEnabled: false,
     contextWindowTokens: 128000,
     autoCompactTokenLimit: 64000,
@@ -602,6 +602,18 @@ export function RuntimeConfigDialog({
 
   useEscapeToClose(onClose);
 
+  useEffect(() => {
+    const htmlOverflow = document.documentElement.style.overflow;
+    const bodyOverflow = document.body.style.overflow;
+    document.documentElement.style.overflow = 'hidden';
+    document.body.style.overflow = 'hidden';
+
+    return () => {
+      document.documentElement.style.overflow = htmlOverflow;
+      document.body.style.overflow = bodyOverflow;
+    };
+  }, []);
+
   useEffect(() => {
     void readRuntimeConfig();
     // The dialog reads once on mount; subsequent reads are explicit user actions.
diff --git a/apps/ai-game-creator-shell/src/styles.css b/apps/ai-game-creator-shell/src/styles.css
index c6fe5d212..3db515b3f 100644
--- a/apps/ai-game-creator-shell/src/styles.css
+++ b/apps/ai-game-creator-shell/src/styles.css
@@ -3381,7 +3381,7 @@ h2 {
   padding: 11px 14px;
   border: 1px solid var(--platform-success-border);
   border-radius: 12px;
-  background: var(--platform-success-fill);
+  background: #edf8ef;
   box-shadow: var(--platform-panel-shadow);
   color: var(--platform-success-text);
   font-size: 12px;
@@ -3391,7 +3391,7 @@ h2 {
 
 .runtime-settings-toast[data-tone='error'] {
   border-color: var(--platform-warm-border);
-  background: var(--platform-warm-bg);
+  background: #fff1ea;
   color: var(--platform-warm-text);
 }
 
@@ -3411,6 +3411,11 @@ h2 {
 }
 
 .runtime-settings-panel {
+  --runtime-settings-fill: #fffdfa;
+  --runtime-settings-topbar-fill: #fffdf9;
+  --runtime-settings-nav-fill: #fdf7f1;
+  --runtime-settings-content-fill: #fffaf6;
+  --runtime-settings-subpanel-fill: #fffdfb;
   grid-template-rows: auto minmax(0, 1fr) auto;
   gap: 0;
   width: min(1080px, 100%);
@@ -3420,7 +3425,7 @@ h2 {
   overflow: hidden;
   border-color: var(--platform-modal-border);
   border-radius: 18px;
-  background: var(--platform-modal-fill);
+  background: var(--runtime-settings-fill);
   box-shadow: var(--platform-panel-shadow);
 }
 
@@ -3437,7 +3442,7 @@ h2 {
   min-height: 76px;
   padding: 15px 18px 14px 22px;
   border-bottom: 1px solid var(--platform-line-soft);
-  background: var(--platform-desktop-topbar-fill);
+  background: var(--runtime-settings-topbar-fill);
 }
 
 .runtime-settings-header > div {
@@ -3488,7 +3493,7 @@ h2 {
   padding: 16px 12px;
   overflow-y: auto;
   border-right: 1px solid var(--platform-line-soft);
-  background: var(--platform-nav-fill);
+  background: var(--runtime-settings-nav-fill);
 }
 
 .runtime-settings-nav nav {
@@ -3580,8 +3585,7 @@ h2 {
   min-height: 0;
   padding: 22px 24px 28px;
   overflow-y: auto;
-  background: var(--platform-desktop-panel-fill);
-  scrollbar-gutter: stable;
+  background: var(--runtime-settings-content-fill);
 }
 
 .runtime-settings-section-header {
@@ -3618,7 +3622,7 @@ h2 {
   padding: 13px;
   border: 1px solid var(--platform-subpanel-border);
   border-radius: 12px;
-  background: var(--platform-subpanel-fill);
+  background: var(--runtime-settings-subpanel-fill);
   color: var(--platform-text-base);
 }
 
@@ -3654,7 +3658,7 @@ h2 {
   overflow: hidden;
   border: 1px solid var(--platform-subpanel-border);
   border-radius: 12px;
-  background: var(--platform-subpanel-fill);
+  background: var(--runtime-settings-subpanel-fill);
 }
 
 .runtime-agent-card-summary {
@@ -3723,7 +3727,7 @@ h2 {
   min-height: 66px;
   padding: 11px 18px 11px 22px;
   border-top: 1px solid var(--platform-line-soft);
-  background: var(--platform-desktop-topbar-fill);
+  background: var(--runtime-settings-topbar-fill);
 }
 
 .runtime-settings-footer .status-line {
@@ -3744,7 +3748,7 @@ h2 {
 
 .runtime-settings-footer .status-line[data-tone='success'] {
   border-color: var(--platform-success-border);
-  background: var(--platform-success-fill);
+  background: #edf8ef;
   color: var(--platform-success-text);
 }
 
@@ -4845,6 +4849,20 @@ iframe.preview-frame {
   color: var(--platform-button-secondary-text);
 }
 
+.game-workbench-view-actions .game-workbench-play-button {
+  border-color: var(--platform-button-primary-border);
+  background: var(--platform-button-primary-fill);
+  color: var(--platform-button-primary-text);
+}
+
+.game-workbench-view-actions .game-workbench-play-button:disabled {
+  border-color: var(--platform-surface-border);
+  background: var(--platform-button-secondary-fill);
+  color: var(--platform-text-muted);
+  cursor: not-allowed;
+  opacity: 0.6;
+}
+
 .game-resource-reorder-status {
   min-width: 0;
   color: #9a725f;
diff --git a/apps/ai-game-creator-shell/tests/appSurface/runtime-settings.suite.ts b/apps/ai-game-creator-shell/tests/appSurface/runtime-settings.suite.ts
index 9ba8040b1..bb19d6b30 100644
--- a/apps/ai-game-creator-shell/tests/appSurface/runtime-settings.suite.ts
+++ b/apps/ai-game-creator-shell/tests/appSurface/runtime-settings.suite.ts
@@ -456,6 +456,44 @@ export function registerRuntimeSettingsTests() {
     expect(screen.queryByRole('dialog', { name: '运行时配置' })).toBeNull();
   });
 
+  it('locks page scrolling while runtime settings are open and restores it after close', async () => {
+    const invoke = vi.fn(async (command: string) => {
+      if (command === 'read_game_creator_app_config') {
+        return {
+          path: '/home/test/AppData/game-creator.config.json',
+          config: {
+            agentMode: 'codex_app_server',
+            llm: {
+              apiKey: '',
+              baseUrl: 'https://llm.example.test/v1',
+              model: 'gpt-scroll-lock',
+              apiKind: 'openai_responses',
+              stream: true,
+              webSearchEnabled: false,
+              requestTimeoutMs: 180000,
+              maxRetries: 2,
+              retryBackoffMs: 500,
+            },
+          },
+        };
+      }
+      throw new Error(`unexpected invoke ${command}`);
+    });
+    window.__TAURI__ = { core: { invoke } };
+    document.documentElement.style.overflow = 'auto';
+    document.body.style.overflow = 'scroll';
+    renderLauncherAt('/?launcher');
+
+    fireEvent.click(screen.getByRole('button', { name: '配置' }));
+    await screen.findByRole('dialog', { name: '运行时配置' });
+    expect(document.documentElement.style.overflow).toBe('hidden');
+    expect(document.body.style.overflow).toBe('hidden');
+
+    fireEvent.click(screen.getByRole('button', { name: '关闭 Agent 设置' }));
+    expect(document.documentElement.style.overflow).toBe('auto');
+    expect(document.body.style.overflow).toBe('scroll');
+  });
+
   it('configures MCP servers and reads the bounded Runner catalog', async () => {
     const manifest = createGameCreationAppManifest(
       'local-project-draft',
@@ -1227,7 +1265,7 @@ export function registerPublishedRuntimeSettingsTests() {
             model: 'gpt-5.6-sol',
             apiKind: 'openai_responses',
             reasoningEffort: 'max',
-            stream: false,
+            stream: true,
             webSearchEnabled: false,
             contextWindowTokens: 128000,
             autoCompactTokenLimit: 64000,