feat: integration & visual polish - lighting, water tuning (#6)

src/scene/Lighting.ts

@@ -9,7 +9,8 @@ export function setupLighting(
   renderer.shadowMap.type = THREE.PCFSoftShadowMap;
 
   // Warm point light near top center inside the tank (main, shadow-casting)
-  const mainLight = new THREE.PointLight(0xffeedd, 2);
+  const mainLight = new THREE.PointLight(0xffeedd, 30);
+  mainLight.decay = 2; // physically correct inverse-square falloff
   mainLight.position.set(0, 2.2, 0);
   mainLight.castShadow = true;
   mainLight.shadow.mapSize.set(1024, 1024);
@@ -17,17 +18,18 @@ export function setupLighting(
   scene.add(mainLight);
 
   // Warm point light offset left-back (fill, no shadow)
-  const fillLight = new THREE.PointLight(0xffe8cc, 1.2);
+  const fillLight = new THREE.PointLight(0xffe8cc, 15);
+  fillLight.decay = 2; // physically correct inverse-square falloff
   fillLight.position.set(-1.2, 2.0, -0.5);
   fillLight.castShadow = false;
   scene.add(fillLight);
 
   // Cool dark blue ambient (dark room feel)
-  const ambient = new THREE.AmbientLight(0x1a2a3a, 0.4);
+  const ambient = new THREE.AmbientLight(0x1a2a3a, 0.6);
   scene.add(ambient);
 
   // Subtle directional from above (no shadow — point light handles shadows)
-  const directional = new THREE.DirectionalLight(0xffffff, 0.3);
+  const directional = new THREE.DirectionalLight(0xffffff, 0.5);
   directional.position.set(0, 5, 0);
   directional.target.position.set(0, 0, 0);
   directional.castShadow = false;

src/scene/Water.ts

@@ -143,7 +143,7 @@ export function createWater(scene: THREE.Scene): { update: (time: number) => voi
     depthWrite: false,
     uniforms: {
       uTime: { value: 0 },
-      uColor: { value: new THREE.Color(0.08, 0.35, 0.45) },
+      uColor: { value: new THREE.Color(0.05, 0.3, 0.4) },
     },
   });
   timeUniforms.push(waterMaterial.uniforms.uTime);