diff --git a/frontend/src/components/sidebar.py b/frontend/src/components/sidebar.py
index c04a03b..14ca9cd 100644
--- a/frontend/src/components/sidebar.py
+++ b/frontend/src/components/sidebar.py
@@ -106,7 +106,7 @@ def _render_thread_item(thread: dict):
     is_current = thread_id == AppState.get_current_thread_id()
     
     # 根据是否当前线程改变按钮样式
-    btn_type = "primary" if is_current else "tertiary"
+    btn_type = "primary" if is_current else "secondary"
     
     # 为了避免内容过长，截断摘要
     display_text = summary[:15] + "..." if len(summary) > 15 else summary