diff --git a/playwright.config.ts b/playwright.config.ts
index 60707b0..4ef3c0f 100644
--- a/playwright.config.ts
+++ b/playwright.config.ts
@@ -1,10 +1,14 @@
 import { defineConfig, devices } from '@playwright/test';
 
 const isCI = !!process.env.CI;
-const testTier = process.env.TEST_TIER || 'standard';
+const testTier = (process.env.TEST_TIER || 'standard') as 'fast' | 'standard' | 'deep';
 const baseURL = process.env.BASE_URL || (isCI ? 'http://localhost:3000' : 'https://novalon.cn');
 
-const tierConfig = {
+const tierConfig: Record<'fast' | 'standard' | 'deep', {
+  timeout: number;
+  retries: number;
+  workers: number | undefined;
+}> = {
   fast: {
     timeout: 15000,
     retries: 0,
@@ -22,7 +26,7 @@ const tierConfig = {
   },
 };
 
-const config = tierConfig[testTier] || tierConfig.standard;
+const config = tierConfig[testTier];
 
 export default defineConfig({
   testDir: './e2e',
diff --git a/src/test-utils/test-data-cleaner.ts b/src/test-utils/test-data-cleaner.ts
index 09bab85..7be2eaa 100644
--- a/src/test-utils/test-data-cleaner.ts
+++ b/src/test-utils/test-data-cleaner.ts
@@ -71,8 +71,11 @@ export class TestDataCleaner {
   static clearCookies(): void {
     if (typeof document !== 'undefined' && document.cookie) {
       document.cookie.split(';').forEach(cookie => {
-        const name = cookie.split('=')[0].trim();
-        document.cookie = `${name}=; expires=Thu, 01 Jan 1970 00:00:00 GMT; path=/`;
+        const parts = cookie.split('=');
+        const name = parts[0]?.trim();
+        if (name) {
+          document.cookie = `${name}=; expires=Thu, 01 Jan 1970 00:00:00 GMT; path=/`;
+        }
       });
     }
   }