diff --git a/frontend/src/pages/Facility3DViewerPage.tsx b/frontend/src/pages/Facility3DViewerPage.tsx
index bd4ed34..1f42ab6 100644
--- a/frontend/src/pages/Facility3DViewerPage.tsx
+++ b/frontend/src/pages/Facility3DViewerPage.tsx
@@ -1,6 +1,6 @@
 import { useEffect, useState, Suspense, useMemo, Component, ReactNode, useRef } from 'react';
 import { Canvas, useFrame } from '@react-three/fiber';
-import { Text, Instances, Instance, Html, CameraControls } from '@react-three/drei';
+import { Text, Instances, Instance, Html, CameraControls, Environment, ContactShadows } from '@react-three/drei';
 import * as THREE from 'three';
 import { layoutApi, Floor3DData } from '../lib/layoutApi';
 import { Loader2, ArrowLeft, Maximize, MousePointer2, Layers, Thermometer, Droplets, Activity, Leaf } from 'lucide-react';
@@ -149,11 +149,11 @@ function PlantInstances({ positions, onPlantClick, visMode }: {
                 </Instances>
             )}
 
-            {/* Empty Slots */}
+            {/* Empty Slots - Refined */}
             {emptySlots.length > 0 && visMode === 'STANDARD' && (
                 <Instances range={emptySlots.length}>
                     <cylinderGeometry args={[0.05, 0.05, 0.1, 8]} />
-                    <meshStandardMaterial color={COLORS.EMPTY_SLOT} opacity={0.3} transparent />
+                    <meshStandardMaterial color="#4b5563" roughness={0.8} />
                     {emptySlots.map((pos, i) => (
                         <Instance
                             key={pos.id || i}
@@ -251,12 +251,13 @@ function FacilityScene({ data, onSelectPlant, targetView, setControls, visMode }
                     <mesh
                         rotation={[-Math.PI / 2, 0, 0]}
                         position={[room.width / 2, 0, room.height / 2]}
+                        receiveShadow
                     >
                         <planeGeometry args={[room.width, room.height]} />
                         <meshStandardMaterial
                             color={floorColor}
-                            metalness={0.2}
-                            roughness={0.8}
+                            roughness={0.9} // Concrete-like
+                            metalness={0.1}
                             transparent={visMode !== 'STANDARD'}
                             opacity={visMode !== 'STANDARD' ? 0.8 : 1}
                         />
@@ -306,9 +307,11 @@ function FacilityScene({ data, onSelectPlant, targetView, setControls, visMode }
                                             section.posY + (section.height / 2)
                                         ]}
                                         rotation={[-Math.PI / 2, 0, 0]}
+                                        castShadow
+                                        receiveShadow
                                     >
                                         <planeGeometry args={[section.width, section.height]} />
-                                        <meshStandardMaterial color="#374151" transparent opacity={0.5} side={THREE.DoubleSide} />
+                                        <meshStandardMaterial color="#64748b" roughness={0.2} metalness={0.8} side={THREE.DoubleSide} />
                                     </mesh>
                                 ))}
 
@@ -361,14 +364,29 @@ function FacilityScene({ data, onSelectPlant, targetView, setControls, visMode }
 
     return (
         <>
-            <ambientLight intensity={1.5} />
-            <pointLight position={[20, 30, 20]} intensity={2} />
-            <directionalLight position={[-10, 50, -10]} intensity={1} castShadow />
+            <Environment preset="city" background={false} />
+            <ambientLight intensity={0.5} />
+            <directionalLight
+                position={[-10, 50, -10]}
+                intensity={1}
+                castShadow
+                shadow-mapSize={[2048, 2048]}
+            />
 
             <group position={[-data.floor.width / 2, 0, -data.floor.height / 2]}>
                 {roomMeshes}
             </group>
 
+            <ContactShadows
+                position={[0, -0.01, 0]}
+                opacity={0.4}
+                scale={100}
+                blur={2.5}
+                far={10}
+                resolution={512}
+                color="#000000"
+            />
+
             <CameraControls
                 ref={controlsRef}
                 minDistance={5}
@@ -378,9 +396,6 @@ function FacilityScene({ data, onSelectPlant, targetView, setControls, visMode }
                 infinityDolly={false}
                 makeDefault
             />
-
-            <gridHelper args={[200, 100, 0x444444, 0x111111]} position={[0, -0.1, 0]} />
-            <axesHelper args={[5]} />
         </>
     );
 }