diff --git a/admin-spa/src/App.tsx b/admin-spa/src/App.tsx
index 8762380..2d6f1c4 100644
--- a/admin-spa/src/App.tsx
+++ b/admin-spa/src/App.tsx
@@ -329,8 +329,8 @@ function Header({ onFullscreen, fullscreen, showToggle = true, scrollContainerRe
     }
   };
   
-  // Hide header completely on mobile in standalone mode
-  if (isStandalone && typeof window !== 'undefined' && window.innerWidth < 768) {
+  // Hide header completely on mobile in fullscreen mode (both standalone and wp-admin fullscreen)
+  if (fullscreen && typeof window !== 'undefined' && window.innerWidth < 768) {
     return null;
   }
   
@@ -485,7 +485,7 @@ function Shell() {
               </main>
             </div>
           ) : (
-            <div className={`flex flex-1 flex-col min-h-0 ${isStandalone ? 'pt-0' : 'pt-16'}`}>
+            <div className={`flex flex-1 flex-col min-h-0 ${fullscreen ? 'pt-0' : 'pt-16'}`}>
               {!isMorePage && (isDashboardRoute ? (
                 <DashboardSubmenuBar items={main.children} fullscreen={true} headerVisible={isHeaderVisible} />
               ) : (
diff --git a/admin-spa/src/components/FAB.tsx b/admin-spa/src/components/FAB.tsx
index 3b0a6c0..9f3822a 100644
--- a/admin-spa/src/components/FAB.tsx
+++ b/admin-spa/src/components/FAB.tsx
@@ -1,7 +1,6 @@
 import React from 'react';
 import { Plus } from 'lucide-react';
 import { useFAB } from '@/contexts/FABContext';
-import { Button } from '@/components/ui/button';
 
 export function FAB() {
   const { config } = useFAB();
@@ -11,13 +10,12 @@ export function FAB() {
   }
 
   return (
-    <Button
+    <button
       onClick={config.onClick}
-      size="lg"
-      className="fixed bottom-[72px] right-4 z-40 w-14 h-14 rounded-2xl shadow-lg hover:shadow-xl transition-all duration-200 md:hidden"
+      className="fixed bottom-20 right-4 z-50 w-14 h-14 rounded-full bg-primary text-primary-foreground shadow-lg hover:shadow-2xl active:scale-95 transition-all duration-200 flex items-center justify-center md:hidden"
       aria-label={config.label}
     >
       {config.icon || <Plus className="w-6 h-6" />}
-    </Button>
+    </button>
   );
 }