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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Royal Driver 3D - Showroom & Drive</title>
    <script src="https://cdn.tailwindcss.com"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/three@0.128.0/examples/js/loaders/GLTFLoader.js"></script>
    <style>
        @import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&family=Rajdhani:wght@400;600&display=swap');

        body {
            margin: 0;
            overflow: hidden;
            background-color: #000;
            font-family: 'Rajdhani', sans-serif;
            user-select: none;
            -webkit-user-select: none;
        }

        #canvas-container {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 1;
        }

        .ui-layer {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 10;
            pointer-events: none;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            padding: 1rem;
            box-sizing: border-box;
        }

        .interactive {
            pointer-events: auto;
        }

        /* Neon Glow Text */
        .neon-text {
            text-shadow: 0 0 5px #fff, 0 0 10px #fff, 0 0 20px #0ff, 0 0 30px #0ff, 0 0 40px #0ff;
        }

        /* Button Styles */
        .btn-glass {
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: white;
            transition: all 0.2s ease;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
        }
        .btn-glass:active {
            transform: scale(0.95);
            background: rgba(255, 255, 255, 0.25);
        }
        .btn-glass.active-btn {
            background: rgba(0, 255, 255, 0.3);
            border-color: #0ff;
            box-shadow: 0 0 15px #0ff;
        }

        /* Color Swatch */
        .swatch {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            border: 2px solid rgba(255,255,255,0.5);
            cursor: pointer;
            transition: transform 0.2s;
        }
        .swatch:hover { transform: scale(1.2); }
        .swatch.selected { border-color: #fff; box-shadow: 0 0 10px #fff; }

        /* HUD */
        .hud-panel {
            background: rgba(0, 0, 0, 0.6);
            border-left: 2px solid #0ff;
            padding: 10px 20px;
            transform: skewX(-15deg);
        }
        .hud-text {
            transform: skewX(15deg);
            font-family: 'Orbitron', sans-serif;
        }

        /* Loader */
        #loader {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: #050505;
            z-index: 100;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            color: #0ff;
            font-family: 'Orbitron', sans-serif;
            transition: opacity 0.5s;
        }
        .loader-bar {
            width: 200px;
            height: 4px;
            background: #333;
            margin-top: 20px;
            position: relative;
            overflow: hidden;
        }
        .loader-progress {
            position: absolute;
            top: 0;
            left: 0;
            height: 100%;
            width: 0%;
            background: #0ff;
            box-shadow: 0 0 10px #0ff;
            transition: width 0.2s;
        }

        /* Animations */
        @keyframes pulse-ring {
            0% { transform: scale(0.8); opacity: 0.5; }
            100% { transform: scale(1.2); opacity: 0; }
        }
    </style>
</head>
<body>

    <!-- Loading Screen -->
    <div id="loader">
        <div class="text-2xl mb-2 tracking-widest">ROYAL DRIVER <span class="text-xs align-top">3D</span></div>
        <div class="text-sm text-gray-400">INITIALIZING ENGINE...</div>
        <div class="loader-bar"><div class="loader-progress" id="loader-progress"></div></div>
        <div class="mt-4 text-xs text-gray-500">Built with anycoder</div>
    </div>

    <!-- 3D Canvas -->
    <div id="canvas-container"></div>

    <!-- UI Layer -->
    <div class="ui-layer">
        
        <!-- Header -->
        <div class="w-full flex justify-between items-start">
            <div class="flex flex-col">
                <h1 class="text-4xl md:text-6xl font-black text-white italic tracking-tighter drop-shadow-lg" style="font-family: 'Orbitron'">
                    ROYAL<span class="text-cyan-400">DRIVER</span>
                </h1>
                <p class="text-cyan-200 text-xs md:text-sm tracking-widest uppercase opacity-80">Simulation Environment v2.4</p>
            </div>
            <div class="hidden md:block">
                <a href="https://huggingface.co/spaces/akhaliq/anycoder" target="_blank" class="text-xs text-white opacity-50 hover:opacity-100 transition cursor-pointer interactive">Built with anycoder</a>
            </div>
        </div>

        <!-- Showroom UI (Centered) -->
        <div id="showroom-ui" class="absolute inset-0 flex flex-col items-center justify-center interactive transition-opacity duration-500">
            <div class="bg-black/60 backdrop-blur-md p-8 rounded-xl border border-cyan-500/30 flex flex-col items-center gap-6 shadow-2xl transform transition-all hover:scale-105">
                <div class="text-center">
                    <h2 class="text-2xl text-white font-bold mb-1">CUSTOMIZE RIDE</h2>
                    <p class="text-gray-400 text-xs">SELECT PAINT JOB</p>
                </div>
                
                <div class="flex gap-4" id="color-picker">
                    <button class="swatch bg-red-600" data-color="0xff0000"></button>
                    <button class="swatch bg-blue-600" data-color="0x0044ff"></button>
                    <button class="swatch bg-green-600" data-color="0x00ff00"></button>
                    <button class="swatch bg-yellow-400" data-color="0xffcc00"></button>
                    <button class="swatch bg-gray-900 border-gray-600" data-color="0x111111"></button>
                    <button class="swatch bg-white" data-color="0xffffff"></button>
                </div>

                <button id="start-btn" class="mt-4 px-12 py-4 bg-cyan-600 hover:bg-cyan-500 text-white font-black text-xl rounded-sm tracking-widest clip-path-polygon transition-all shadow-[0_0_20px_rgba(0,255,255,0.5)] hover:shadow-[0_0_40px_rgba(0,255,255,0.8)] active:scale-95">
                    START RACE
                </button>
            </div>
        </div>

        <!-- Driving UI (Hidden by default) -->
        <div id="driving-ui" class="absolute inset-0 flex flex-col justify-between opacity-0 pointer-events-none transition-opacity duration-500">
            
            <!-- HUD Top -->
            <div class="w-full flex justify-end p-4">
                <div class="hud-panel">
                    <div class="hud-text text-right">
                        <div class="text-xs text-cyan-300 uppercase">Speed</div>
                        <div class="text-4xl text-white font-bold"><span id="speed-display">0</span> <span class="text-sm">KM/H</span></div>
                    </div>
                </div>
            </div>

            <!-- Controls Bottom -->
            <div class="w-full flex justify-between items-end p-4 pb-8">
                <!-- Steering -->
                <div class="flex gap-4">
                    <button id="btn-left" class="btn-glass w-20 h-20 rounded-full flex items-center justify-center text-3xl interactive">
                        <svg xmlns="http://www.w3.org/2000/svg" class="h-10 w-10" fill="none" viewBox="0 0 24 24" stroke="currentColor"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 19l-7-7 7-7" /></svg>
                    </button>
                    <button id="btn-right" class="btn-glass w-20 h-20 rounded-full flex items-center justify-center text-3xl interactive">
                        <svg xmlns="http://www.w3.org/2000/svg" class="h-10 w-10" fill="none" viewBox="0 0 24 24" stroke="currentColor"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7" /></svg>
                    </button>
                </div>

                <!-- Pedals -->
                <div class="flex gap-4">
                    <button id="btn-brake" class="btn-glass w-24 h-24 rounded-full flex flex-col items-center justify-center border-red-500/50 interactive">
                        <span class="font-bold text-red-400">BRAKE</span>
                    </button>
                    <button id="btn-gas" class="btn-glass w-28 h-28 rounded-full flex flex-col items-center justify-center border-green-500/50 interactive">
                        <span class="font-bold text-green-400">GAS</span>
                    </button>
                </div>
            </div>
        </div>

    </div>

    <script>
        /**
         * ------------------------------------------------------------------
         *  APPLICATION STATE & CONFIGURATION
         * ------------------------------------------------------------------
         */
        const CONFIG = {
            maxSpeed: 120, // Arbitrary units
            acceleration: 0.5,
            deceleration: 0.2,
            turnSpeed: 0.03,
            cameraOffset: new THREE.Vector3(0, 3, -7), // Behind car
            showroomRotationSpeed: 0.005
        };

        const STATE = {
            mode: 'showroom', // 'showroom' or 'drive'
            speed: 0,
            steering: 0, // -1 to 1
            isAccelerating: false,
            isBraking: false,
            audioInitialized: false
        };

        /**
         * ------------------------------------------------------------------
         *  ASSET MANAGEMENT (Simulated since we don't have real external files)
         * ------------------------------------------------------------------
         */
        // Helper to create a texture programmatically if fetch fails or for placeholders
        function createPlaceholderTexture(type) {
            const canvas = document.createElement('canvas');
            canvas.width = 512;
            canvas.height = 512;
            const ctx = canvas.getContext('2d');

            if (type === 'road') {
                // Asphalt
                ctx.fillStyle = '#333';
                ctx.fillRect(0, 0, 512, 512);
                // Noise
                for(let i=0; i<5000; i++) {
                    ctx.fillStyle = `rgba(255,255,255,${Math.random() * 0.1})`;
                    ctx.fillRect(Math.random()*512, Math.random()*512, 2, 2);
                }
                // Center lines
                ctx.strokeStyle = '#fff';
                ctx.lineWidth = 4;
                ctx.setLineDash([40, 40]);
                ctx.beginPath();
                ctx.moveTo(256, 0);
                ctx.lineTo(256, 512);
                ctx.stroke();
            } else if (type === 'pole') {
                // Metal/Concrete
                const grad = ctx.createLinearGradient(0, 0, 512, 0);
                grad.addColorStop(0, '#444');
                grad.addColorStop(0.5, '#777');
                grad.addColorStop(1, '#444');
                ctx.fillStyle = grad;
                ctx.fillRect(0, 0, 512, 512);
                // Rust
                ctx.fillStyle = 'rgba(100, 50, 20, 0.2)';
                ctx.fillRect(0, 0, 512, 100);
                ctx.fillRect(0, 412, 512, 100);
            }

            const tex = new THREE.CanvasTexture(canvas);
            tex.wrapS = THREE.RepeatWrapping;
            tex.wrapT = THREE.RepeatWrapping;
            return tex;
        }

        // Since we can't guarantee external GLB files work perfectly in a single HTML without CORS/availability issues,
        // we will construct a high-quality "Beta" car using primitives to ensure the app ALWAYS works perfectly.
        function createProceduralCar() {
            const carGroup = new THREE.Group();

            // Chassis
            const chassisGeo = new THREE.BoxGeometry(2, 0.5, 4);
            const chassisMat = new THREE.MeshStandardMaterial({ color: 0xcc0000, metalness: 0.6, roughness: 0.2 });
            const chassis = new THREE.Mesh(chassisGeo, chassisMat);
            chassis.position.y = 0.5;
            chassis.castShadow = true;
            carGroup.add(chassis);

            // Cabin
            const cabinGeo = new THREE.BoxGeometry(1.8, 0.4, 2);
            const cabinMat = new THREE.MeshStandardMaterial({ color: 0x111111, metalness: 0.9, roughness: 0.1 });
            const cabin = new THREE.Mesh(cabinGeo, cabinMat);
            cabin.position.set(0, 1.0, -0.2);
            cabin.castShadow = true;
            carGroup.add(cabin);

            // Wheels
            const wheelGeo = new THREE.CylinderGeometry(0.4, 0.4, 0.3, 24);
            const wheelMat = new THREE.MeshStandardMaterial({ color: 0x111111, roughness: 0.9 });
            
            const positions = [
                { x: -1.1, z: 1.2 }, { x: 1.1, z: 1.2 },
                { x: -1.1, z: -1.2 }, { x: 1.1, z: -1.2 }
            ];

            positions.forEach(pos => {
                const wheel = new THREE.Mesh(wheelGeo, wheelMat);
                wheel.rotation.z = Math.PI / 2;
                wheel.position.set(pos.x, 0.4, pos.z);
                wheel.castShadow = true;
                carGroup.add(wheel);
            });

            // Headlights (Physical Geometry)
            const lightGeo = new THREE.CircleGeometry(0.15, 16);
            const lightMat = new THREE.MeshBasicMaterial({ color: 0xffffcc });
            
            const leftLight = new THREE.Mesh(lightGeo, lightMat);
            leftLight.position.set(-0.6, 0.5, 2.01);
            carGroup.add(leftLight);

            const rightLight = new THREE.Mesh(lightGeo, lightMat);
            rightLight.position.set(0.6, 0.5, 2.01);
            carGroup.add(rightLight);

            // Tail lights
            const tailGeo = new THREE.PlaneGeometry(0.3, 0.1);
            const tailMat = new THREE.MeshBasicMaterial({ color: 0xff0000 });
            const leftTail = new THREE.Mesh(tailGeo, tailMat);
            leftTail.position.set(-0.6, 0.5, -2.01);
            leftTail.rotation.y = Math.PI;
            carGroup.add(leftTail);
            
            const rightTail = new THREE.Mesh(tailGeo, tailMat);
            rightTail.position.set(0.6, 0.5, -2.01);
            rightTail.rotation.y = Math.PI;
            carGroup.add(rightTail);

            // Spotlights for Showroom
            const spotL = new THREE.SpotLight(0xffffee, 2);
            spotL.position.set(-0.6, 0.5, 2.1);
            spotL.target.position.set(-0.6, 0, 10);
            spotL.angle = Math.PI / 6;
            spotL.penumbra = 0.2;
            spotL.distance = 20;
            carGroup.add(spotL);
            carGroup.add(spotL.target);

            const spotR = new THREE.SpotLight(0xffffee, 2);
            spotR.position.set(0.6, 0.5, 2.1);
            spotR.target.position.set(0.6, 0, 10);
            spotR.angle = Math.PI / 6;
            spotR.penumbra = 0.2;
            spotR.distance = 20;
            carGroup.add(spotR);
            carGroup.add(spotR.target);

            // Store references for color changing
            carGroup.userData.bodyMeshes = [chassis];

            return carGroup;
        }

        /**
         * ------------------------------------------------------------------
         *  THREE.JS SETUP
         * ------------------------------------------------------------------
         */
        const container = document.getElementById('canvas-container');
        const scene = new THREE.Scene();
        scene.background = new THREE.Color(0x87CEEB); // Daytime Sky
        scene.fog = new THREE.Fog(0x87CEEB, 20, 100);

        const camera = new THREE.PerspectiveCamera(60, window.innerWidth / window.innerHeight, 0.1, 1000);
        const renderer = new THREE.WebGLRenderer({ antialias: true, alpha: false });
        renderer.setSize(window.innerWidth, window.innerHeight);
        renderer.shadowMap.enabled = true;
        renderer.shadowMap.type = THREE.PCFSoftShadowMap;
        container.appendChild(renderer.domElement);

        // Lighting
        const ambientLight = new THREE.AmbientLight(0xffffff, 0.6);
        scene.add(ambientLight);

        const sunLight = new THREE.DirectionalLight(0xffffff, 0.8);
        sunLight.position.set(50, 100, 50);
        sunLight.castShadow = true;
        sunLight.shadow.mapSize.width = 2048;
        sunLight.shadow.mapSize.height = 2048;
        sunLight.shadow.camera.near = 0.5;
        sunLight.shadow.camera.far = 500;
        sunLight.shadow.camera.left = -50;
        sunLight.shadow.camera.right = 50;
        sunLight.shadow.camera.top = 50;
        sunLight.shadow.camera.bottom = -50;
        scene.add(sunLight);

        // Environment
        const textureLoader = new THREE.TextureLoader();
        const roadTexture = createPlaceholderTexture('road');
        roadTexture.repeat.set(1, 10);
        
        const poleTexture = createPlaceholderTexture('pole');

        // Ground Plane (Grass)
        const groundGeo = new THREE.PlaneGeometry(1000, 1000);
        const groundMat = new THREE.MeshStandardMaterial({ color: 0x2a5a2a });
        const ground = new THREE.Mesh(groundGeo, groundMat);
        ground.rotation.x = -Math.PI / 2;
        ground.position.y = -0.1;
        ground.receiveShadow = true;
        scene.add(ground);

        // Road
        const roadGeo = new THREE.PlaneGeometry(8, 1000); // Wide road
        const roadMat = new THREE.MeshStandardMaterial({ 
            map: roadTexture, 
            roughness: 0.8 
        });
        const road = new THREE.Mesh(roadGeo, roadMat);
        road.rotation.x = -Math.PI / 2;
        road.receiveShadow = true;
        scene.add(road);

        // Poles
        const poles = [];
        function createPoles() {
            const poleGeo = new THREE.CylinderGeometry(0.1, 0.1, 6, 8);
            const poleMat = new THREE.MeshStandardMaterial({ map: poleTexture, roughness: 0.9 });
            
            for (let i = -50; i < 50; i+=2) {
                // Left Pole
                const pL = new THREE.Mesh(poleGeo, poleMat);
                pL.position.set(-6, 3, i * 10);
                pL.castShadow = true;
                scene.add(pL);
                poles.push(pL);

                // Right Pole
                const pR = new THREE.Mesh(poleGeo, poleMat);
                pR.position.set(6, 3, i * 10);
                pR.castShadow = true;
                scene.add(pR);
                poles.push(pR);
            }
        }
        createPoles();

        /**
         * ------------------------------------------------------------------
         *  CAR LOGIC
         * ------------------------------------------------------------------
         */
        let car; 
        let carVelocity = 0;
        let carSteering = 0;

        function initCar() {
            // Try to load external GLB, fallback to procedural if fails
            const loader = new THREE.GLTFLoader();
            loader.load(
                'beta.glb', 
                (gltf) => {
                    car = gltf.scene;
                    setupCar(car);
                    document.getElementById('loader-progress').style.width = '100%';
                    setTimeout(() => document.getElementById('loader').style.opacity = '0', 500);
                    setTimeout(() => document.getElementById('loader').style.display = 'none', 1000);
                },
                (xhr) => {
                    const percent = (xhr.loaded / xhr.total) * 100;
                    document.getElementById('loader-progress').style.width = percent + '%';
                },
                (error) => {
                    console.warn("Could not load GLB, using procedural model.", error);
                    car = createProceduralCar();
                    scene.add(car);
                    // Hide loader
                    document.getElementById('loader-progress').style.width = '100%';
                    setTimeout(() => document.getElementById('loader').style.opacity = '0', 500);
                    setTimeout(() => document.getElementById('loader').style.display = 'none', 1000);
                }
            );
        }

        function setupCar(model) {
            // Scale and center if needed
            const box = new THREE.Box3().setFromObject(model);
            const center = box.getCenter(new THREE.Vector3());
            model.position.sub(center); // Center pivot
            
            // Orient to face +Z (forward in Three.js usually, but we want nose at +Z)
            // If model faces +Z, good. If not, rotate.
            // Assuming standard car models face +Z or -Z.
            // Let's rotate 180 if needed. Usually GLTF cars face +Z or -Z.
            // We will assume standard orientation.
            
            scene.add(model);
            
            // Add shadows
            model.traverse((child) => {
                if (child.isMesh) {
                    child.castShadow = true;
                    child.receiveShadow = true;
                    // Try to identify body parts for color changing
                    if (!child.name.toLowerCase().includes('glass') && !child.name.toLowerCase().includes('wheel')) {
                        if(!model.userData.bodyMeshes) model.userData.bodyMeshes = [];
                        model.userData.bodyMeshes.push(child);
                    }
                }
            });
        }

        initCar();

        /**
         * ------------------------------------------------------------------
         *  AUDIO SYSTEM (Web Audio API)
         * ------------------------------------------------------------------
         */
        const AudioContext = window.AudioContext || window.webkitAudioContext;
        let audioCtx;
        let engineOsc;
        let engineGain;
        
        // Since we can't guarantee external MP3s, we synthesize engine sounds using Oscillators.
        // This is actually better for dynamic pitch changes!
        
        function initAudio() {
            if (STATE.audioInitialized) return;
            audioCtx = new AudioContext();
            
            // Create Oscillator for engine hum
            engineOsc = audioCtx.createOscillator();
            engineGain = audioCtx.createGain();
            
            engineOsc.type = 'sawtooth';
            engineOsc.frequency.value = 50; // Idle rumble
            
            // Lowpass filter to make it sound muffled like an engine
            const filter = audioCtx.createBiquadFilter();
            filter.type = 'lowpass';
            filter.frequency.value = 400;
            
            engineOsc.connect(filter);
            filter.connect(engineGain);
            engineGain.connect(audioCtx.destination);
            
            engineOsc.start();
            engineGain.gain.value = 0; // Start silent
            
            STATE.audioInitialized = true;
        }

        function updateEngineSound() {
            if (!STATE.audioInitialized || !audioCtx) return;

            // Resume context if suspended (browser policy)
            if (audioCtx.state === 'suspended') audioCtx.resume();

            const baseFreq = 60;
            const maxFreq = 300;
            
            // Calculate speed ratio (0 to 1)
            const speedRatio = Math.min(STATE.speed / CONFIG.maxSpeed, 1);
            
            // Pitch modulation
            const targetFreq = baseFreq + (speedRatio * (maxFreq - baseFreq));
            engineOsc.frequency.setTargetAtTime(targetFreq, audioCtx.currentTime, 0.1);
            
            // Volume modulation (louder when faster)
            const targetGain = 0.05 + (speedRatio * 0.1); 
            engineGain.gain.setTargetAtTime(targetGain, audioCtx.currentTime, 0.1);
        }

        // Audio Event Listeners
        function playStartSound() {
            if(!audioCtx) return;
            const osc = audioCtx.createOscillator();
            const gain = audioCtx.createGain();
            osc.connect(gain);
            gain.connect(audioCtx.destination);
            
            osc.frequency.setValueAtTime(100, audioCtx.currentTime);
            osc.frequency.exponentialRampToValueAtTime(600, audioCtx.currentTime + 1.5);
            
            gain.gain.setValueAtTime(0.1, audioCtx.currentTime);
            gain.gain.exponentialRampToValueAtTime(0.01, audioCtx.currentTime + 1.5);
            
            osc.start();
            osc.stop(audioCtx.currentTime + 1.5);
        }

        /**
         * ------------------------------------------------------------------
         *  UI INTERACTION
         * ------------------------------------------------------------------
         */
        
        // Color Picker
        document.querySelectorAll('.swatch').forEach(swatch => {
            swatch.addEventListener('click', (e) => {
                const colorHex = parseInt(e.target.dataset.color);
                if (car && car.userData.bodyMeshes) {
                    car.userData.bodyMeshes.forEach(mesh => {
                        // Clone material to not affect others sharing it
                        if(mesh.material) {
                            mesh.material = mesh.material.clone();
                            mesh.material.color.setHex(colorHex);
                        }
                    });
                }
                // Visual feedback
                document.querySelectorAll('.swatch').forEach(s => s.classList.remove('selected'));
                e.target.classList.add('selected');
            });
        });

        // Start Button
        document.getElementById('start-btn').addEventListener('click', () => {
            initAudio(); // Initialize Audio Context on user gesture
            playStartSound();
            
            // Transition UI
            document.getElementById('showroom-ui').style.opacity = '0';
            document.getElementById('showroom-ui').style.pointerEvents = 'none';
            
            const driveUI = document.getElementById('driving-ui');
            driveUI.style.opacity = '1';
            driveUI.style.pointerEvents = 'auto';

            STATE.mode = 'drive';

            // Reset Car Position
            if(car) {
                car.position.set(0, 0, 0);
                car.rotation.set(0, Math.PI, 0); // Face forward
                STATE.speed = 0;
                STATE.steering = 0;
            }
        });

        // Driving Controls
        const btnGas = document.getElementById('btn-gas');
        const btnBrake = document.getElementById('btn-brake');
        const btnLeft = document.getElementById('btn-left');
        const btnRight = document.getElementById('btn-right');

        function setupTouch(el, key) {
            const start = (e) => { e.preventDefault(); STATE[key] = true; el.classList.add('active-btn'); };
            const end = (e) => { e.preventDefault(); STATE[key] = false; el.classList.remove('active-btn'); };
            
            el.addEventListener('mousedown', start);
            el.addEventListener('mouseup', end);
            el.addEventListener('mouseleave', end);
            el.addEventListener('touchstart', start);
            el.addEventListener('touchend', end);
        }

        setupTouch(btnGas, 'isAccelerating');
        setupTouch(btnBrake, 'isBraking');
        setupTouch(btnLeft, 'isTurningLeft');
        setupTouch(btnRight, 'isTurningRight');

        // Keyboard controls
        window.addEventListener('keydown', (e) => {
            if(STATE.mode !== 'drive') return;
            if(e.key === 'ArrowUp' || e.key === 'w') STATE.isAccelerating = true;
            if(e.key === 'ArrowDown' || e.key === 's') STATE.isBraking = true;
            if(e.key === 'ArrowLeft' || e.key === 'a') STATE.isTurningLeft = true;
            if(e.key === 'ArrowRight' || e.key === 'd') STATE.isTurningRight = true;
        });

        window.addEventListener('keyup', (e) => {
            if(e.key === 'ArrowUp' || e.key === 'w') STATE.isAccelerating = false;
            if(e.key === 'ArrowDown' || e.key === 's') STATE.isBraking = false;
            if(e.key === 'ArrowLeft' || e.key === 'a') STATE.isTurningLeft = false;
            if(e.key === 'ArrowRight' || e.key === 'd') STATE.isTurningRight = false;
        });


        /**
         * ------------------------------------------------------------------
         *  ANIMATION LOOP
         * ------------------------------------------------------------------
         */
        function updatePhysics() {
            if (!car) return;

            if (STATE.mode === 'showroom') {
                car.rotation.y += CONFIG.showroomRotationSpeed;
                // Floating effect
                car.position.y = Math.sin(Date.now() * 0.002) * 0.1;
            } 
            else if (STATE.mode === 'drive') {
                // Acceleration
                if (STATE.isAccelerating) {
                    STATE.speed += CONFIG.acceleration;
                } else if (STATE.isBraking) {
                    STATE.speed -= CONFIG.deceleration * 2;
                } else {
                    // Rolling friction
                    STATE.speed -= CONFIG.deceleration * 0.5;
                }

                // Clamp Speed
                STATE.speed = Math.max(0, Math.min(STATE.speed, CONFIG.maxSpeed));

                // Steering
                let targetSteering = 0;
                if (STATE.isTurningLeft) targetSteering = 1;
                if (STATE.isTurningRight) targetSteering = -1;
                
                // Smooth steering
                STATE.steering += (targetSteering - STATE.steering) * 0.1;

                // Rotation (only if moving)
                if (STATE.speed > 0.1) {
                    car.rotation.y += STATE.steering * CONFIG.turnSpeed * (STATE.speed / 20);
                }

                // Move Car
                // Forward vector is (0, 0, 1) in local space, transformed to world
                const direction = new THREE.Vector3(0, 0, 1);
                direction.applyAxisAngle(new THREE.Vector3(0, 1, 0), car.rotation.y);
                car.position.add(direction.multiplyScalar(STATE.speed * 0.01));

                // Camera Follow
                const relativeOffset = new THREE.Vector3(0, 4, -8); // Behind and up
                
                // Calculate ideal camera position based on car rotation
                const cameraOffset = relativeOffset.applyMatrix4(car.matrixWorld);
                
                // Smoothly interpolate camera position
                camera.position.lerp(cameraOffset, 0.1);
                camera.lookAt(car.position);

                // Update UI
                document.getElementById('speed-display').innerText = Math.floor(STATE.speed);
                
                // Update Audio
                updateEngineSound();
                
                // Infinite Road/Environment Logic (Teleport objects to create infinite illusion)
                // Instead of moving world, we check if poles are too far behind car and move them ahead
                poles.forEach(pole => {
                    if (pole.position.z < car.position.z - 20) {
                        pole.position.z += 100; // Move ahead by total loop length
                    }
                });
                // Texture offset for road movement effect
                if (roadMat.map) {
                    roadMat.map.offset.y -= (STATE.speed * 0.001);
                }
            }
        }

        function animate() {
            requestAnimationFrame(animate);
            updatePhysics();
            renderer.render(scene, camera);
        }

        // Handle Window Resize
        window.addEventListener('resize', () => {
            camera.aspect = window.innerWidth / window.innerHeight;
            camera.updateProjectionMatrix();
            renderer.setSize(window.innerWidth, window.innerHeight);
        });

        // Start Loop
        animate();

    </script>
</body>
</html>