네비게이션 바 디자인 전환 기능 추가

src/main/resources/static/css/main.css

@@ -697,18 +697,6 @@ body.design-survey-active .global-header {
   }
 }
 
-body.design-variant-B .logo-text {
-  font-size: 18px !important;
-}
-body.design-variant-B .nav-link {
-  margin: 0 20px !important;
-}
-
-body.design-variant-C .nav-link {
-  margin: 0 20px !important;
-  font-weight: bold !important;
-}
-
 .blind {
   position: absolute;
   width: 1px;

src/main/resources/static/sass/layout/_header.scss

@@ -100,16 +100,8 @@ body.design-survey-active {
   }
 }
 
-// Design Variant B
-body.design-variant-B {
-  .logo-text { font-size: 18px !important; }
-  .nav-link { margin: 0 20px !important; }
-}
-
-// Design Variant C
-body.design-variant-C {
-  .nav-link { margin: 0 20px !important; font-weight: bold !important; }
-}
+// 디자인 변형 스타일은 JavaScript에서 동적으로 적용됩니다.
+// header_container.html의 DESIGN_OPTIONS 참조
 
 // Blind text for screen readers
 .blind {