diff --git a/common/common.css b/common/common.css
index 494f899..9af1d97 100644
--- a/common/common.css
+++ b/common/common.css
@@ -67,9 +67,11 @@
 
 }
 
-.nav-shadow {
-  top: 0;
-  box-shadow: 0px 0px 8px rgba(52, 52, 52, 0.08);
+.nav-shadow {
+  top: 0;
+  box-shadow: 0px 0px 8px rgba(52, 52, 52, 0.08);
+  /* header 背景：轻微蓝白渐变，既保持整体浅色，又和地球的浅蓝色调统一 */
+  background: linear-gradient(90deg, rgba(255, 255, 255, 0.98) 0%, rgba(245, 247, 255, 0.98) 40%, rgba(227, 237, 255, 0.98) 100%);
 }
 
 .nav-header {