split into multiple assemblies

Assets/Desert/Runtime/Puzzle A/SymbolButton.cs

@@ -0,0 +1,37 @@
+using EscapeRoomEngine.Engine.Runtime;
+using UnityEngine;
+
+namespace EscapeRoomEngine.Desert.Runtime.Puzzle_A
+{
+    [RequireComponent(typeof(MeshRenderer))]
+    public class SymbolButton : Button
+    {
+        private static readonly int FresnelPower = Shader.PropertyToID("_FresnelPower");
+        private static readonly int Color = Shader.PropertyToID("_Color");
+
+        public EngineTheme theme;
+
+        public override bool Pressed
+        {
+            get => base.Pressed;
+            protected set
+            {
+                base.Pressed = value;
+                
+                var color =
+                    Pressed ? theme.activeColor
+                    : Active ? theme.puzzleColor
+                    : theme.solvedColor;
+                _material.SetColor(FresnelPower, color);
+                _material.SetColor(Color, color);
+            }
+        }
+
+        private Material _material;
+
+        private void Start()
+        {
+            _material = GetComponent<MeshRenderer>().material;
+        }
+    }
+}