diff --git a/src/analysis/analyzers/user_title_analyzer.py b/src/analysis/analyzers/user_title_analyzer.py
index ed8e11c..e7c33b9 100644
--- a/src/analysis/analyzers/user_title_analyzer.py
+++ b/src/analysis/analyzers/user_title_analyzer.py
@@ -179,7 +179,6 @@ class UserTitleAnalyzer(BaseAnalyzer):
 
                 # 分析用户特征
                 night_messages = sum(stats["hours"][h] for h in range(6))
-                day_messages = stats["message_count"] - night_messages
                 avg_chars = (
                     stats["char_count"] / stats["message_count"]
                     if stats["message_count"] > 0
diff --git a/src/core/config.py b/src/core/config.py
index 6f89fb5..2e6f6b1 100644
--- a/src/core/config.py
+++ b/src/core/config.py
@@ -313,7 +313,6 @@ class ConfigManager:
         """检查 pyppeteer 可用性"""
         try:
             import pyppeteer
-            from pyppeteer import launch
 
             self._pyppeteer_available = True
 
@@ -348,7 +347,6 @@ class ConfigManager:
             # 强制重新导入
             try:
                 import pyppeteer
-                from pyppeteer import launch
 
                 # 更新全局变量
                 self._pyppeteer_available = True
diff --git a/src/reports/generators.py b/src/reports/generators.py
index 8ea212d..df90aa2 100644
--- a/src/reports/generators.py
+++ b/src/reports/generators.py
@@ -485,8 +485,8 @@ class ReportGenerator:
                         for page in pages:
                             try:
                                 await page.close()
-                            except:
-                                pass
+                            except Exception as close_err:
+                                logger.debug(f"关闭页面时忽略的异常: {close_err}")
 
                         # 等待一小段时间让资源释放
                         await asyncio.sleep(0.5)
@@ -499,8 +499,8 @@ class ReportGenerator:
                         # 强制清理
                         try:
                             await browser.disconnect()
-                        except:
-                            pass
+                        except Exception as disc_err:
+                            logger.debug(f"断开浏览器连接时忽略的异常: {disc_err}")
 
         except Exception as e:
             error_msg = str(e)
diff --git a/src/utils/pdf_utils.py b/src/utils/pdf_utils.py
index 9b550f9..0916f8e 100644
--- a/src/utils/pdf_utils.py
+++ b/src/utils/pdf_utils.py
@@ -170,7 +170,7 @@ class PDFInstaller:
                         )
 
                         # 只下载 Chromium
-                        chromium_revision = launcher._get_chromium_revision()
+                        launcher._get_chromium_revision()
                         await launcher._download_chromium()
 
                         logger.info("✅ Chromium 下载完成")