diff --git a/apps/worker/video_processing/subtitle_render_engine.py b/apps/worker/video_processing/subtitle_render_engine.py
index 1daac15a4..fab753953 100755
--- a/apps/worker/video_processing/subtitle_render_engine.py
+++ b/apps/worker/video_processing/subtitle_render_engine.py
@@ -171,9 +171,7 @@ class SubtitleRenderEngine:
                 except (TypeError, ValueError):
                     continue
 
-    def add_asr_timeline(
-        self, timeline: Any, style: SubtitleStyle | None = None
-    ) -> None:
+    def add_asr_timeline(self, timeline: Any, style: SubtitleStyle | None = None) -> None:
         """从 SubtitleTimeline 对象添加 ASR 字幕."""
         if not timeline or not hasattr(timeline, "segments") or not timeline.segments:
             return
@@ -254,9 +252,7 @@ Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
             back_color = style.ass_background_color
         else:
             border_style = 1
-            back_color = (
-                style.ass_shadow_color if style.shadow_enabled else style.ass_font_color
-            )
+            back_color = style.ass_shadow_color if style.shadow_enabled else style.ass_font_color
 
         outline_val = style.stroke_width if style.stroke_enabled else 0.0
         shadow_val = style.shadow_offset_y if style.shadow_enabled else 0
@@ -289,10 +285,7 @@ Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
         start_time = _format_ass_time(max(0, seg.start))
         end_time = _format_ass_time(max(seg.start + 0.1, seg.end))
 
-        return (
-            f"Dialogue: 0,{start_time},{end_time},{seg.style_name},,0,0,0,,"
-            f"{effect_tags}{safe_text}"
-        )
+        return f"Dialogue: 0,{start_time},{end_time},{seg.style_name},,0,0,0,," f"{effect_tags}{safe_text}"
 
     @property
     def has_subtitles(self) -> bool:
@@ -340,10 +333,7 @@ def build_subtitles_from_plan(
             style_dict = title_cfg.get("style") or {}
             style = SubtitleStyle.from_dict(style_dict)
             # 标题默认样式：顶部、大字号、粗体
-            if (
-                style.position == DEFAULT_POSITION
-                and style.font_size == DEFAULT_FONT_SIZE
-            ):
+            if style.position == DEFAULT_POSITION and style.font_size == DEFAULT_FONT_SIZE:
                 style.position = "top_center"
                 style.font_size = 48
                 style.bold = True
@@ -419,9 +409,7 @@ def build_subtitle_filter(
     # - Windows 路径的 \ → /
     # - 冒号 : → \:
     # - 单引号 ' → '\''
-    safe_path = (
-        ass_path_str.replace("\\", "/").replace(":", "\\:").replace("'", "'\\''")
-    )
+    safe_path = ass_path_str.replace("\\", "/").replace(":", "\\:").replace("'", "'\\''")
     return f"{video_input_label}subtitles='{safe_path}'[{output_label}]"
 
 
@@ -461,6 +449,4 @@ def _validate_subtitle_path(subtitle_path: str, work_dir: Path) -> None:
             resolved_path.relative_to(resolved_work_dir)
         except ValueError as _e:
             if not is_in_allowed_dirs(resolved_path):
-                raise PathSecurityError(
-                    f"字幕路径不在允许目录内: {subtitle_path[:80]}"
-                ) from _e
+                raise PathSecurityError(f"字幕路径不在允许目录内: {subtitle_path[:80]}") from _e