style: adjust tire material properties and update 3D model positioning in HeroBackground3D

src/components/ui/3d/HeroBackground3D.tsx

@@ -63,9 +63,9 @@ function AeroxModel() {
       metalness: 0.9,
     });
     const tireMat = new THREE.MeshStandardMaterial({
-      color: '#0f172a',
-      roughness: 0.8,
-      metalness: 0.15,
+      color: '#111111',
+      roughness: 0.9,
+      metalness: 0.1,
     });
 
     clone.traverse((child) => {
@@ -95,7 +95,7 @@ function AeroxModel() {
 
   return (
     <Float speed={1.2} rotationIntensity={0.1} floatIntensity={0.3}>
-      <group ref={group} rotation={[0, -0.5, 0]} position={[0, -0.1, 0]}>
+      <group ref={group} rotation={[0, -0.5, 0]} position={[2.5, -0.1, -1]}>
         <primitive object={model} />
       </group>
     </Float>