Update

Assets/Scripts/UI/BaseUIController.cs

@@ -0,0 +1,55 @@
+using UnityEngine;
+using UnityEngine.UIElements;
+using PrimeTween;
+using System.Threading.Tasks;
+
+namespace Hallucinate.UI
+{
+    public abstract class BaseUIController
+    {
+        protected VisualElement root;
+        protected UIManager uiManager;
+
+        public virtual void Initialize(VisualElement uxmlRoot, UIManager manager)
+        {
+            root = uxmlRoot;
+            uiManager = manager;
+            
+            // Default to hidden
+            Hide();
+        }
+
+        public virtual void Show()
+        {
+            if (root != null)
+                root.style.display = DisplayStyle.Flex;
+        }
+
+        public virtual void Hide()
+        {
+            if (root != null)
+                root.style.display = DisplayStyle.None;
+        }
+
+        public virtual async Task PlayTransitionIn()
+        {
+            if (root == null) return;
+
+            Show();
+            // Fly-in from right using Custom tween for style.translate
+            root.style.translate = new StyleTranslate(new Translate(Length.Percent(100), 0));
+            await Tween.Custom(100f, 0f, duration: 0.5f, ease: Ease.OutBack, 
+                onValueChange: val => root.style.translate = new StyleTranslate(new Translate(Length.Percent(val), 0)));
+        }
+
+        public virtual async Task PlayTransitionOut()
+        {
+            if (root == null) return;
+
+            // Fly-out to left
+            await Tween.Custom(0f, -100f, duration: 0.5f, ease: Ease.InBack, 
+                onValueChange: val => root.style.translate = new StyleTranslate(new Translate(Length.Percent(val), 0)));
+            Hide();
+        }
+    }
+}