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HTML

<!DOCTYPE html>
<html lang="th">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Shooter Pro UI</title>
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: 'Segoe UI', sans-serif;
      background: #121212;
      color: #eee;
      display: flex;
      flex-direction: column;
      align-items: center;
      min-height: 100vh;
    }
    header {
      width: 100%;
      background: #1e1e1e;
      padding: 15px;
      text-align: center;
      font-size: 24px;
      color: #fff;
      box-shadow: 0 2px 5px rgba(0,0,0,0.5);
    }
    #gameArea {
      position: relative;
      width: 90%;
      max-width: 600px;
      aspect-ratio: 5/4;
      border: 2px solid #444;
      background: url('https://cdn.pixabay.com/photo/2020/10/01/18/45/stars-5616976_960_720.jpg') center / cover no-repeat;
      overflow: hidden;
      margin-top: 20px;
    }
    canvas {
      position: absolute;
      top: 0; left: 0;
      width: 100%; height: 100%;
    }
    .ui-panel {
      margin-top: 15px;
      width: 90%;
      max-width: 600px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .ui-panel div {
      font-size: 18px;
    }
    button.start-btn {
      padding: 10px 20px;
      font-size: 18px;
      background: #0a84ff;
      color: white;
      border: none;
      border-radius: 5px;
      cursor: pointer;
      transition: background 0.3s;
    }
    button.start-btn:hover {
      background: #0060c8;
    }
    #leaderboard {
      margin-top: 20px;
      width: 90%;
      max-width: 600px;
      background: #1e1e1e;
      color: #ddd;
      padding: 10px;
      border-radius: 5px;
    }
    #leaderboard h3 { margin-bottom: 5px; }
    #leaderboard ol { padding-left: 20px; }
    /* mobile touch control indicator */
    .touch-info {
      margin-top: 10px;
      font-size: 14px;
      color: #aaa;
    }
  </style>
</head>
<body>
  <header>Shooter Pro with Sound & Leaderboard</header>
  <div id="gameArea">
    <canvas id="shooterCanvas"></canvas>
  </div>
  <div class="ui-panel">
    <div>Score: <span id="score">0</span></div>
    <div>High Score: <span id="highScore">0</span></div>
    <button id="startBtn" class="start-btn">เริ่มเกม</button>
  </div>
  <div class="touch-info">บนมือถือ: แตะที่จอด้านที่ต้องการเลื่อนฐานยิง / แตะกลางจอเพื่อยิง</div>
  <div id="leaderboard">
    <h3>Leaderboard (Top 5)</h3>
    <ol id="leaderboardList">
      
    </ol>
  </div>

<audio id="sfxShoot" src="https://assets.mixkit.co/sfx/preview/mixkit-short-laser-gun-shot-622.mp3"></audio>
  <audio id="sfxHit" src="https://assets.mixkit.co/sfx/preview/mixkit-arcade-game-explosion-784.mp3"></audio>
  <audio id="sfxGameOver" src="https://assets.mixkit.co/sfx/preview/mixkit-arcade-retro-game-over-470.mp3"></audio>

let width, height;
    function resizeCanvas() {
      width = canvas.clientWidth;
      height = canvas.clientHeight;
      canvas.width = width;
      canvas.height = height;
    }
    window.addEventListener('resize', resizeCanvas);
    resizeCanvas();

// Game variables
    let score = 0;
    let highScore = parseInt(localStorage.getItem('shooterHighScore')) || 0;
    let playerX, playerWidth = 60, playerHeight = 15;
    let bullets = [];
    let targets = [];
    let gameRunning = false;
    let animationFrame;
    const sfxShoot = document.getElementById('sfxShoot');
    const sfxHit = document.getElementById('sfxHit');
    const sfxGameOver = document.getElementById('sfxGameOver');

// Leaderboard
    let leaderboard = JSON.parse(localStorage.getItem('shooterLeaderboard')) || [];

function startGame() {
      score = 0;
      document.getElementById('score').textContent = score;
      document.getElementById('highScore').textContent = highScore;
      playerX = width/2 - playerWidth/2;
      bullets = [];
      spawnTargets();
      gameRunning = true;

loop();

// Event listeners
      window.addEventListener('mousemove', mouseMoveHandler);
      window.addEventListener('touchmove', touchMoveHandler);
      window.addEventListener('click', shootHandler);
      window.addEventListener('touchstart', shootHandler);

document.getElementById('startBtn').disabled = true;
    }

function clampPlayer() {
      if (playerX < 0) playerX = 0;
      if (playerX + playerWidth > width) playerX = width - playerWidth;
    }

function shootHandler(e) {
      if (!gameRunning) return;
      // ยิง
      sfxShoot.currentTime = 0;
      sfxShoot.play();
      bullets.push({
        x: playerX + playerWidth / 2,
        y: height - playerHeight - 10,
        radius: 5,
        speedY: 5
      });
    }

function update() {
      // move bullets
      bullets = bullets.filter(b => b.y > 0);
      bullets.forEach(b => b.y -= b.speedY);

// move targets
      targets.forEach(t => {
        t.x += t.speedX * t.direction;
        if (t.x + t.size > width || t.x < 0) {
          t.direction *= -1;
        }
      });

// check collisions
      bullets.forEach((b, bi) => {
        targets.forEach((t, ti) => {
          if (b.x > t.x && b.x < t.x + t.size && b.y < t.y + t.size && b.y > t.y) {
            // hit
            sfxHit.currentTime = 0;
            sfxHit.play();
            score += 1;
            document.getElementById('score').textContent = score;
            // remove target & bullet
            targets.splice(ti, 1);
            bullets.splice(bi, 1);
          }
        });
      });

// if targets cleared → next wave
      if (targets.length === 0) {
        spawnTargets();
      }
    }

function draw() {
      ctx.clearRect(0, 0, width, height);
      drawPlayer();
      drawTargets();
      drawBullets();
    }

function loop() {
      if (!gameRunning) {
        return;
      }
      update();
      draw();
      animationFrame = requestAnimationFrame(loop);
    }

function endGame() {
      gameRunning = false;
      sfxGameOver.currentTime = 0;
      sfxGameOver.play();
      // update high score
      if (score > highScore) {
        highScore = score;
        localStorage.setItem('shooterHighScore', highScore);
      }
      // leaderboard
      updateLeaderboard(score);
      showLeaderboard();
      document.getElementById('startBtn').disabled = false;
    }

function updateLeaderboard(sc) {
      leaderboard.push(sc);
      leaderboard.sort((a,b) => b - a);
      leaderboard = leaderboard.slice(0,5);
      localStorage.setItem('shooterLeaderboard', JSON.stringify(leaderboard));
    }

// end game condition: e.g., miss bullets or time or allow game over if player fails
    // For demo, we put simple condition: miss too many or bullet overflows? We'll use timer
    // Let's set a time limit
    let gameTimer = 20; // 20 seconds per play
    let timerInterval;
    function startTimer() {
      gameTimer = 20;
      const timerEl = document.createElement('div');
      timerEl.id = 'timerEl';
      timerEl.style = 'position:absolute;top:10px;right:10px;color:#fff;font-size:20px;';
      document.getElementById('gameArea').appendChild(timerEl);
      timerInterval = setInterval(() => {
        gameTimer -= 1;
        timerEl.textContent = `Time: ${gameTimer}s`;
        if (gameTimer <= 0) {
          clearInterval(timerInterval);
          endGame();
        }
      }, 1000);
    }

document.getElementById('startBtn').addEventListener('click', () => {
      startGame();
      startTimer();
    });

// load leaderboard on start
    showLeaderboard();
  </script>
</body>
</html>

CSS