diff --git a/css/nav-mega-menu.css b/css/nav-mega-menu.css
index 45e6104..2ea7b1f 100644
--- a/css/nav-mega-menu.css
+++ b/css/nav-mega-menu.css
@@ -117,14 +117,15 @@
   margin-top: 20px;
 }
 
-/* 三级菜单项 */
-.nav-third-item {
+/* 三级菜单项 - 提高选择器优先级 */
+.nav-cont-menu .nav-third-item {
   margin: 0;
   padding: 0;
   min-width: 0;
 }
 
-.nav-third-link {
+.nav-cont-menu .nav-third-grid .nav-third-link,
+.nav-third-panel .nav-third-link {
   display: block;
   width: 100%;
   padding: 10px 12px 10px 24px;
@@ -142,7 +143,8 @@
   position: relative;
 }
 
-.nav-third-link::before {
+.nav-cont-menu .nav-third-grid .nav-third-link::before,
+.nav-third-panel .nav-third-link::before {
   content: '›';
   position: absolute;
   left: 8px;
@@ -153,14 +155,16 @@
   font-weight: bold;
 }
 
-.nav-third-link:hover {
+.nav-cont-menu .nav-third-grid .nav-third-link:hover,
+.nav-third-panel .nav-third-link:hover {
   background: #e6f7ff;
   border-color: #91d5ff;
   color: #1890ff;
   padding-left: 28px;
 }
 
-.nav-third-link:hover::before {
+.nav-cont-menu .nav-third-grid .nav-third-link:hover::before,
+.nav-third-panel .nav-third-link:hover::before {
   left: 12px;
 }