Fix Dark Theme Application Architecture

src/app/features/header-menu/header-menu.scss

@@ -11,8 +11,8 @@
   min-width: 100%;
 
   box-sizing: border-box;
-  box-shadow: 0 2px 0 oklch(0 0 0 / 20%);
-  background-color: oklch(1 0 0 / 60%);
+  box-shadow: 0 2px 0 light-dark(oklch(0 0 0 / 20%), oklch(1 0 0 / 20%));
+  background-color: light-dark(oklch(1 0 0 / 60%), oklch(0 0 0 / 60%));
 
   backdrop-filter: blur(20px);