diff --git a/lib/shared/widgets/app_dialog.dart b/lib/shared/widgets/app_dialog.dart
index 73004af5..d47fc7d0 100644
--- a/lib/shared/widgets/app_dialog.dart
+++ b/lib/shared/widgets/app_dialog.dart
@@ -101,23 +101,25 @@ class _BlurredDialogScaffoldState extends State<_BlurredDialogScaffold> {
       child: Stack(
         fit: StackFit.expand,
         children: [
-          // Backdrop: animates blur sigma and dim alpha directly (no FadeTransition).
+          // Backdrop: static blur; only opacity/dim animate (blur sigma is expensive).
           Positioned.fill(
             child: GestureDetector(
               behavior: HitTestBehavior.opaque,
               onTap: widget.barrierDismissible ? widget.onDismiss : null,
               child: AnimatedBuilder(
                 animation: curved,
-                builder: (ctx, _) {
-                  final t = curved.value;
-                  return ClipRect(
-                    child: BackdropFilter(
-                      filter:
-                          ImageFilter.blur(sigmaX: 8.0 * t, sigmaY: 8.0 * t),
-                      child: Container(
-                        color: Colors.black.withValues(alpha: 0.32 * t),
-                      ),
+                child: ClipRect(
+                  child: BackdropFilter(
+                    filter: ImageFilter.blur(sigmaX: 8, sigmaY: 8),
+                    child: const ColoredBox(
+                      color: Color(0x52000000), // black @ 0.32
                     ),
+                  ),
+                ),
+                builder: (ctx, child) {
+                  return Opacity(
+                    opacity: curved.value.clamp(0.0, 1.0),
+                    child: child,
                   );
                 },
               ),
diff --git a/test/shared/app_dialog_test.dart b/test/shared/app_dialog_test.dart
index 96a775f8..6f39ddee 100644
--- a/test/shared/app_dialog_test.dart
+++ b/test/shared/app_dialog_test.dart
@@ -1,3 +1,5 @@
+import 'dart:ui' show ImageFilter;
+
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:querya_desktop/core/motion/querya_motion.dart';
@@ -83,6 +85,23 @@ void main() {
     expect(find.byType(ScaleTransition), findsNothing);
   });
 
+  testWidgets('backdrop keeps static blur sigma; opacity carries enter',
+      (tester) async {
+    final ctx = await pumpHost(tester);
+
+    showAppDialog<void>(
+      context: ctx,
+      builder: (c) => const SimpleDialog(title: Text('Blur')),
+    );
+    // Mid-enter: blur must stay sigma 8 (not sigma * t).
+    await tester.pump();
+    await tester.pump(const Duration(milliseconds: 40));
+
+    final filter = tester.widget<BackdropFilter>(find.byType(BackdropFilter));
+    expect(filter.filter, ImageFilter.blur(sigmaX: 8, sigmaY: 8));
+    expect(find.byType(Opacity), findsWidgets);
+  });
+
   testWidgets('enter uses standard duration under full motion', (tester) async {
     final ctx = await pumpHost(tester);
     showAppDialog<void>(