diff --git a/css/nav-mega-menu.css b/css/nav-mega-menu.css
index f1d565b..d8509f0 100644
--- a/css/nav-mega-menu.css
+++ b/css/nav-mega-menu.css
@@ -27,7 +27,7 @@
 .nav-cont-menu {
   display: none;
   width: 100%;
-  max-width: 720px;
+  max-width: 900px;
   margin: 0 auto;
   background: rgba(14, 16, 26, 0.98);
   backdrop-filter: blur(24px);
@@ -91,7 +91,7 @@
 /* ── 三级链接网格 ── */
 .nav-group-grid {
   display: grid;
-  grid-template-columns: repeat(3, 1fr);
+  grid-template-columns: repeat(4, 1fr);
   gap: 2px;
 }