diff --git a/apps/worker/worker_app/tasks/viral_video.py b/apps/worker/worker_app/tasks/viral_video.py
index 3e9375b95..6ebedcb07 100644
--- a/apps/worker/worker_app/tasks/viral_video.py
+++ b/apps/worker/worker_app/tasks/viral_video.py
@@ -381,6 +381,7 @@ def _step_tts(job: ViralVideoJob, copy_text: str):
     """步骤 6: CosyVoice 配音。P1：返回 Path；失败返回 None。"""
     try:
         from pathlib import Path as _Path
+
         from services.tts_service_factory import get_tts_service
 
         tts_service = get_tts_service()
@@ -432,8 +433,9 @@ def _step_render(job, storyboard, tts_path, bgm):
     import tempfile
     from pathlib import Path
 
-    from packages.shared.ai_service import call_video_generation
     from video_processing.concat_engine import concat_video_files
+
+    from packages.shared.ai_service import call_video_generation
     from packages.shared.ffmpeg_utils import run_ffmpeg
 
     if not storyboard:
@@ -527,8 +529,8 @@ def _step_render(job, storyboard, tts_path, bgm):
 
 
 def _probe_ok(video_path: str) -> bool:
-    from pathlib import Path as _Path
     import subprocess
+    from pathlib import Path as _Path
 
     try:
         if not _Path(video_path).exists():
diff --git a/tests/unit/test_viral_video_p0.py b/tests/unit/test_viral_video_p0.py
index 188b70d4b..7417b9d84 100644
--- a/tests/unit/test_viral_video_p0.py
+++ b/tests/unit/test_viral_video_p0.py
@@ -238,6 +238,7 @@ class TestResumeReadsImageAnalysis:
     def test_resume_uses_persisted_image_analysis(self):
         """resume_pipeline 应从 job.image_analysis 读（P0-3 持久化）。"""
         import inspect
+
         from apps.worker.worker_app.tasks import viral_video as vv
 
         src = inspect.getsource(vv.resume_viral_video_pipeline)