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HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Web Rhythm Hero</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="game-container">
        
        <div class="ui-panel">
            <div class="score-box">Score: <span id="score">0</span></div>
            <button id="start-btn">Start Game</button>
        </div>

<div class="tracks-container">
            <div class="track" id="track-0">
                <div class="key-indicator">A</div>
            </div>
            <div class="track" id="track-1">
                <div class="key-indicator">S</div>
            </div>
            <div class="track" id="track-2">
                <div class="key-indicator">K</div>
            </div>
            <div class="track" id="track-3">
                <div class="key-indicator">L</div>
            </div>
            
            
            <div class="hit-zone"></div>
        </div>
    </div>

CSS

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background: #111424;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
}

.game-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    max-width: 500px;
}

.ui-panel {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 15px;
    background: #1b1f38;
    border-radius: 10px 10px 0 0;
    border-bottom: 3px solid #ff007f;
}

.score-box {
    font-size: 1.5rem;
    font-weight: bold;
    color: #00ffff;
    text-shadow: 0 0 10px rgba(0,255,255,0.5);
}

#start-btn {
    padding: 10px 20px;
    font-size: 1rem;
    font-weight: bold;
    background: #ff007f;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: 0.2s;
}

#start-btn:hover {
    background: #ff55aa;
    box-shadow: 0 0 15px #ff007f;
}

/* The Rhythm Highway */
.tracks-container {
    position: relative;
    display: flex;
    width: 100%;
    height: 500px;
    background: linear-gradient(to bottom, #16192b, #0d0f1d);
    border: 4px solid #1b1f38;
    border-top: none;
    /* Optional: creates an arcade-like tilted highway angle */
    perspective: 400px; 
}

.track {
    position: relative;
    flex: 1;
    height: 100%;
    border-right: 1px dashed rgba(255, 255, 255, 0.1);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: center;
}

.track:last-child {
    border-right: none;
}

/* Individual track theme accents */
#track-0 { border-left: 2px solid #ff3333; }
#track-1 { border-left: 1px solid #33ff33; }
#track-2 { border-left: 1px solid #3333ff; }
#track-3 { border-right: 2px solid #ffff33; }

.key-indicator {
    width: 80%;
    padding: 10px 0;
    margin-bottom: 10px;
    text-align: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 5px;
    font-weight: bold;
    font-size: 1.2rem;
    z-index: 3;
    pointer-events: none;
}

/* Flash effect when a correct key is hit */
.track.active-hit {
    background: linear-gradient(to top, rgba(255, 255, 255, 0.15), transparent);
}

/* Target baseline line */
.hit-zone {
    position: absolute;
    bottom: 50px;
    left: 0;
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.4);
    box-shadow: 0 0 10px white;
    pointer-events: none;
    z-index: 2;
}

/* Falling Rhythm Notes */
.note {
    position: absolute;
    width: 75%;
    height: 25px;
    border-radius: 5px;
    box-shadow: 0 0 12px rgba(255,255,255,0.4);
    z-index: 1;
}

/* Unique color matching for tracks */
.note-0 { background: #ff3333; box-shadow: 0 0 15px #ff3333; }
.note-1 { background: #33ff33; box-shadow: 0 0 15px #33ff33; }
.note-2 { background: #3333ff; box-shadow: 0 0 15px #3333ff; }
.note-3 { background: #ffff33; box-shadow: 0 0 15px #ffff33; }

// Game configurations
const TRACK_KEYS = { 'a': 0, 's': 1, 'k': 2, 'l': 3 };
const NOTE_SPEED = 4;        // Pixels dropped per frame
const HIT_THRESHOLD = 30;    // Margin of error allowance (in pixels)
const TARGET_Y = 450;        // Vertical destination of the target line (500px height - 50px bottom)

let score = 0;
let isPlaying = false;
let gameLoopId;
let noteSpawnInterval;
let activeNotes = [];

// Audio Setup via Web Audio API 
let audioCtx = null;
const trackFrequencies = [261.63, 329.63, 392.00, 523.25]; // C4, E4, G4, C5 arpeggio chord

// DOM Elements
const scoreEl = document.getElementById('score');
const startBtn = document.getElementById('start-btn');
const tracks = [
    document.getElementById('track-0'),
    document.getElementById('track-1'),
    document.getElementById('track-2'),
    document.getElementById('track-3')
];

// Initialize Synthesizer Sound
function playNoteSound(trackIndex) {
    if (!audioCtx) audioCtx = new (window.AudioContext || window.webkitAudioContext)();
    
    let osc = audioCtx.createOscillator();
    let gainNode = audioCtx.createGain();
    
    osc.type = 'triangle'; 
    osc.frequency.setValueAtTime(trackFrequencies[trackIndex], audioCtx.currentTime);
    
    gainNode.gain.setValueAtTime(0.3, audioCtx.currentTime);
    // Smooth audio tail-off fadeout
    gainNode.gain.exponentialRampToValueAtTime(0.0001, audioCtx.currentTime + 0.3);
    
    osc.connect(gainNode);
    gainNode.connect(audioCtx.destination);
    
    osc.start();
    osc.stop(audioCtx.currentTime + 0.3);
}

// Spawn Notes
function spawnNote() {
    if (!isPlaying) return;
    
    // Pick a random track lane (0 to 3)
    const trackIndex = Math.floor(Math.random() * 4);
    const trackEl = tracks[trackIndex];
    
    const noteEl = document.createElement('div');
    noteEl.classList.add('note', `note-${trackIndex}`);
    noteEl.style.top = '0px';
    trackEl.appendChild(noteEl);
    
    activeNotes.push({
        element: noteEl,
        track: trackIndex,
        y: 0
    });
}

// Primary Animation Loop updates physical frame movements
function updateGame() {
    for (let i = activeNotes.length - 1; i >= 0; i--) {
        let note = activeNotes[i];
        note.y += NOTE_SPEED;
        note.element.style.top = note.y + 'px';
        
        // Remove note if it drops past bottom boundaries
        if (note.y > 500) {
            note.element.remove();
            activeNotes.splice(i, 1);
            // Optional: Subtract score or count "Miss" here if desired
        }
    }
    
    if (isPlaying) {
        gameLoopId = requestAnimationFrame(updateGame);
    }
}

// Register User Key Input Hits
function handleInput(trackIndex) {
    // Provide visual baseline flash feedback
    tracks[trackIndex].classList.add('active-hit');
    setTimeout(() => tracks[trackIndex].classList.remove('active-hit'), 100);

// Look for the lowest note inside the corresponding track lane
    let noteHitIndex = activeNotes.findIndex(note => note.track === trackIndex);
    
    if (noteHitIndex !== -1) {
        let note = activeNotes[noteHitIndex];
        let accuracy = Math.abs(note.y - TARGET_Y);
        
        // If note is within target range
        if (accuracy <= HIT_THRESHOLD) {
            score += 10;
            scoreEl.textContent = score;
            playNoteSound(trackIndex);
            
            // Remove the struck note
            note.element.remove();
            activeNotes.splice(noteHitIndex, 1);
        }
    }
}

// State Control
function startGame() {
    if (isPlaying) return;
    
    // Clear legacy elements
    activeNotes.forEach(n => n.element.remove());
    activeNotes = [];
    score = 0;
    scoreEl.textContent = score;
    
    isPlaying = true;
    startBtn.innerText = "Playing...";
    startBtn.style.opacity = "0.6";

// Start Loops
    gameLoopId = requestAnimationFrame(updateGame);
    noteSpawnInterval = setInterval(spawnNote, 600); // New note drops every 600ms
}

// Event Listeners
startBtn.addEventListener('click', startGame);

window.addEventListener('keydown', (e) => {
    const key = e.key.toLowerCase();
    if (key in TRACK_KEYS) {
        handleInput(TRACK_KEYS[key]);
    }
});

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