diff --git a/assets/menav.svg b/assets/menav.svg
index 58c8aae..f30ad80 100644
--- a/assets/menav.svg
+++ b/assets/menav.svg
@@ -1,6 +1,6 @@
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="22 22 56 56">
-  <!-- 黑色的字母 M -->
-  <path d="M 22 78 L 22 22 L 34 22 L 50 48 L 66 22 L 78 22 L 78 78 L 66 78 L 66 45 L 55 62 L 45 62 L 34 45 L 34 78 Z" fill="#1A1B1E"/>
+  <!-- 字母 M：使用比主题蓝更深一点的颜色，适配深色背景 -->
+  <path d="M 22 78 L 22 22 L 34 22 L 50 48 L 66 22 L 78 22 L 78 78 L 66 78 L 66 45 L 55 62 L 45 62 L 34 45 L 34 78 Z" fill="#425E82"/>
   <!-- 蓝色的向上箭头 -->
   <path d="M 45 70 L 45 45 L 36 48 L 50 28 L 64 48 L 55 45 L 55 70 Z" fill="#7694B9"/>
-</svg>
\ No newline at end of file
+</svg>