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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>🍎 Apple Merge</title>
    <style>
       body {
            font-family: 'SF Pro Text', 'SF Pro Icons', 'Helvetica Neue', 'Helvetica', 'Arial', sans-serif;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            margin: 0;
            background-color: #f0f0f0;
            overflow: hidden;
            user-select: none;
        }

        #header {
            display: flex;
            justify-content: center;
            align-items: center;
            width: 90vw;
            max-width: 90vh;
            padding: 10px;
            margin-bottom: 10px;
        }

        #score-display {
            font-size: 1.75rem;
            font-weight: 600;
            color: #333;
            margin: 0;
        }

        #combinable-pairs {
            position: absolute;
            top: 10px;
            right: 10px;
            font-size: 1.25rem;
            font-weight: 600;
            color: #555;
             z-index: 20;
        }

        #game-container {
            position: relative;
            width: 90vw;
            height: 90vw;
            max-width: 90vh;
            max-height: 90vh;
             background-color: #a7d9ed;
            border: 2px solid #333;
            border-radius: 15px;
            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
            touch-action: none;
            display: grid;
            grid-template-columns: repeat(10, 1fr);
            grid-template-rows: repeat(10, 1fr);
            gap: 3px;
        }

        .grid-cell {
            width: 100%;
            height: 100%;
            box-sizing: border-box;
            position: relative;
            border-radius: 8px;
        }

        #selection-box {
            position: absolute;
            border: 2px dashed blue;
            background-color: rgba(0, 0, 255, 0.2);
            display: none;
            z-index: 10;
            pointer-events: none;
            border-radius: 7px;
        }

        .apple {
            width: 85%;
            height: 85%;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: transform 0.1s ease-out, filter 0.1s ease-out;
             background-color: rgba(255, 255, 255, 0.8);
            border-radius: 50%;
            box-sizing: border-box;
            font-size: calc(2em + 1.5vw);
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            z-index: 2;
            box-shadow: 0 1px 3px rgba(0,0,0,0.1);

        }

        .apple span {
            font-size: 0.5em;
            color: #000;
            font-weight: bold;
            z-index: 3;
            pointer-events: none;
            user-select: none;
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            text-shadow: 0px 1px 3px #fff;
        }

        .apple.selected {
            transform: translate(-50%, -50%) scale(1.1);
            filter: brightness(1.2);
            z-index: 4;
        }

        .apple.removing {
             animation: confettiExplode 0.6s ease-out forwards;
        }

        @keyframes confettiExplode {
            0% { opacity: 1; transform: scale(1) rotate(0); }
            100% {
              opacity: 0;
              transform: scale(var(--random-scale))
                         translateX(calc(var(--random-x) * 40px))
                         translateY(calc(var(--random-y) * 40px))
                         rotate(calc(var(--random-rotate) * 360deg));
            }
        }

        #game-over-screen {
           position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.8);
            display: none; /* Initially hidden */
            flex-direction: column;
            justify-content: center;
            align-items: center;
            color: white;
            font-size: 42px;
            z-index: 30;
            border-radius: 15px;
        }

        #game-over-screen button {
            margin-top: 25px;
            padding: 12px 24px;
            font-size: 24px;
            cursor: pointer;
           background-color: #007aff; /* Apple blue */
            color: white;
            border: none;
            border-radius: 8px;
            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
            transition: background-color: 0.2s ease;
        }

        #game-over-screen button:hover {
            background-color: #0062cc;
        }
    </style>
</head>
<body>
    <div id="header">
        <div id="score-display">Score: 0</div>
    </div>
    <div id="combinable-pairs">Pairs: 0</div>
    <div id="game-container">
        <div id="selection-box"></div>
        <div id="game-over-screen">
            <div>No More Moves!</div>
            <button onclick="restartGame()">Restart</button>
        </div>
    </div>

    <script>
      const gameContainer = document.getElementById('game-container');
      const selectionBox = document.getElementById('selection-box');
      const scoreDisplay = document.getElementById('score-display');
      const gameOverScreen = document.getElementById('game-over-screen');
      const combinablePairsDisplay = document.getElementById('combinable-pairs');
      const gridSize = 10;
      let startCell = null;
      let isSelecting = false;
      let selectedApples = [];
      let score = 0;
      let isMouseDown = false;
      let lastTouchEnd = 0;

      // Helper function to get relative coordinates, handling both mouse and touch events.
      function getRelativeCoordinates(event, element) {
        const rect = element.getBoundingClientRect();
        const clientX = event.clientX || (event.touches && event.touches[0].clientX);
        const clientY = event.clientY || (event.touches && event.touches[0].clientY);

        if (clientX === undefined || clientY === undefined) {
          return null;
        }
        return { x: clientX - rect.left, y: clientY - rect.top };
      }

      // Helper function to get the row and column of a cell from coordinates.
      function getCellFromCoordinates(coords) {
        if (!coords) return null;
        const cellSize = gameContainer.offsetWidth / gridSize;
        const col = Math.floor(coords.x / cellSize);
        const row = Math.floor(coords.y / cellSize);

        if (row >= 0 && row < gridSize && col >= 0 && col < gridSize) {
          return { row, col };
        }
        return null;
      }

      // Creates an apple with a random number (1-9).
      function createApple(row, col) {
        const apple = document.createElement('div');
        apple.classList.add('apple');
        const randomNumber = Math.floor(Math.random() * 9) + 1;
        apple.innerHTML = `🍎<span>${randomNumber}</span>`;
        apple.dataset.value = randomNumber;
        apple.dataset.row = row;
        apple.dataset.col = col;
        return apple;
      }

      // Populates the grid with apples.
      function populateGrid() {
        for (let row = 0; row < gridSize; row++) {
          for (let col = 0; col < gridSize; col++) {
            const cell = document.createElement('div');
            cell.classList.add('grid-cell');
            cell.dataset.row = row;
            cell.dataset.col = col;
            cell.addEventListener('touchstart', preventZoom, { passive: false });  // Prevent zoom on double-tap
            const apple = createApple(row, col);
            cell.appendChild(apple);
            gameContainer.appendChild(cell);
          }
        }
        updateCombinablePairs();
      }
        // Prevent page zoom on touch devices
       function preventZoom(e) {
            if (e.touches && e.touches.length > 1) {
                e.preventDefault(); return;
            }
            if (e.timeStamp - lastTouchEnd < 300) { e.preventDefault(); }
        }


      // Handles the start of a selection (mousedown or touchstart).
      function handleSelectionStart(event) {
          if (event.type === 'touchend') { lastTouchEnd = event.timeStamp; }

        const coords = getRelativeCoordinates(event, gameContainer);
        const cell = getCellFromCoordinates(coords);
        if (!cell) return;

        // Ensure we're starting on an apple.
        const elementAtPoint = document.elementFromPoint(
          event.clientX || (event.touches && event.touches[0].clientX),
          event.clientY || (event.touches && event.touches[0].clientY)
        );

        if (!elementAtPoint || !elementAtPoint.classList.contains('apple')) {
          return;
        }


        isMouseDown = true;
        startCell = cell;
        isSelecting = true;
        deselectAllApples();

        // Set initial size and position of the selection box.
        const cellSize = gameContainer.offsetWidth / gridSize;
        selectionBox.style.left = `${startCell.col * cellSize}px`;
        selectionBox.style.top = `${startCell.row * cellSize}px`;
        selectionBox.style.width = `${cellSize}px`;
        selectionBox.style.height = `${cellSize}px`;
        selectionBox.style.display = 'block';
        selectApplesInBox();
        event.preventDefault(); // Prevent other events like scrolling.
      }

      // Handles mouse/touch movement during selection.
      function handleSelectionMove(event) {
        if (!isSelecting || !isMouseDown) return;

        const coords = getRelativeCoordinates(event, gameContainer);
        if (!coords) return;

        const currentCell = getCellFromCoordinates(coords);
        if (!currentCell) return;

        const cellSize = gameContainer.offsetWidth / gridSize;

        // Calculate top-left and bottom-right corners of the selection box.
        const top = Math.min(startCell.row, currentCell.row);
        const left = Math.min(startCell.col, currentCell.col);
        const bottom = Math.max(startCell.row, currentCell.row);
        const right = Math.max(startCell.col, currentCell.col);

        // Update selection box size and position.
        selectionBox.style.top = `${top * cellSize}px`;
        selectionBox.style.left = `${left * cellSize}px`;
        selectionBox.style.width = `${(right - left + 1) * cellSize}px`;
        selectionBox.style.height = `${(bottom - top + 1) * cellSize}px`;

        selectApplesInBox();
        event.preventDefault();
      }

      // Handles the end of a selection (mouseup or touchend).
      function handleSelectionEnd(event) {
          if (event.type === 'touchend') { lastTouchEnd = event.timeStamp; }
        if (!isSelecting) return;

        isMouseDown = false;
        isSelecting = false;
        selectionBox.style.display = 'none';  // Hide selection box.
        checkSum();  // Check the sum of selected apples.
        startCell = null; // Reset startCell.
        event.preventDefault();
      }


    function selectApplesInBox() {
        const apples = document.querySelectorAll('.apple');
        const selectionRect = selectionBox.getBoundingClientRect(); // Selection box rect

        apples.forEach(apple => {
            const appleRect = apple.getBoundingClientRect();

            // Calculate the center of the apple.
            const appleCenterX = appleRect.left + appleRect.width / 2;
            const appleCenterY = appleRect.top + appleRect.height / 2;

            // Check if the apple's center is within the selection box.
            const isInside = appleCenterX >= selectionRect.left &&
                             appleCenterX <= selectionRect.right &&
                             appleCenterY >= selectionRect.top &&
                             appleCenterY <= selectionRect.bottom;

            if (isInside) {
                if (!selectedApples.includes(apple)) {
                  apple.classList.add('selected');
                  selectedApples.push(apple);
                }
            } else {
                apple.classList.remove('selected');
                selectedApples = selectedApples.filter(a => a !== apple);
            }
        });
    }


      // Deselects all apples.
      function deselectAllApples() {
        selectedApples.forEach(apple => apple.classList.remove('selected'));
        selectedApples = [];
      }

      // Checks if the sum of selected apples is 10.  If so, removes them and updates the score.
        function checkSum() {
          let sum = 0;
          selectedApples.forEach(apple => sum += parseInt(apple.dataset.value));

          if (sum === 10) {
            score += selectedApples.length;
            scoreDisplay.textContent = `Score: ${score}`;

            selectedApples.forEach(apple => {
              apple.classList.add('removing');
              // Add random animation properties
              apple.style.setProperty('--random-x', Math.random() * 2 - 1);  // -1 to 1
              apple.style.setProperty('--random-y', Math.random() * 2 - 1);
              apple.style.setProperty('--random-rotate', Math.random() * 2 - 1);
              apple.style.setProperty('--random-scale', Math.random() * 1 + 0.5); // 0.5 to 1.5

              // Remove the apple after the animation finishes.
              apple.addEventListener('animationend', () => {
                const parentCell = apple.parentElement;
                if (parentCell && parentCell.classList.contains('grid-cell')) {
                  parentCell.removeChild(apple);
                  updateCombinablePairs(); // Check for game over after removing apples.
                }
              });
            });

            selectedApples = []; // Clear the selection.
          } else {
            deselectAllApples(); // Deselect if the sum is not 10.
          }
        }


      // Checks if there are any combinable pairs left on the board.
      function hasCombinablePairs() {
        const apples = document.querySelectorAll('.apple');
        const values = Array.from(apples).map(apple => parseInt(apple.dataset.value));

        for (let i = 0; i < values.length; i++) {
          for (let j = i + 1; j < values.length; j++) {
            if (values[i] + values[j] === 10) {
              return true; // Found a pair that sums to 10.
            }
          }
        }
        return false; // No pairs found.
      }

      // Updates the display of combinable pairs and checks for game over.
      function updateCombinablePairs() {
        const apples = document.querySelectorAll('.apple');
        const values = Array.from(apples).map(apple => parseInt(apple.dataset.value));
        let count = 0;

        for (let i = 0; i < values.length; i++) {
          for (let j = i + 1; j < values.length; j++) {
            if (values[i] + values[j] === 10) {
              count++;
            }
          }
        }

        combinablePairsDisplay.textContent = `Pairs: ${count}`;

        // Check for game over (no apples left or no combinable pairs).
        if (count === 0 && apples.length > 0) {
          gameOverScreen.style.display = "flex";
        }
      }


      // Starts a new game.
      function startGame() {
        populateGrid();
      }

      // Restarts the game.
      function restartGame() {
        score = 0;
        scoreDisplay.textContent = "Score: 0";
        // Clear existing apples.
        while (gameContainer.firstChild) {
          gameContainer.removeChild(gameContainer.firstChild);
        }
        gameOverScreen.style.display = "none";
        startGame();
      }

      // Event listeners for mouse and touch events.
      gameContainer.addEventListener('mousedown', handleSelectionStart);
      gameContainer.addEventListener('mousemove', handleSelectionMove);
      gameContainer.addEventListener('mouseup', handleSelectionEnd);
      gameContainer.addEventListener('touchstart', handleSelectionStart);
      gameContainer.addEventListener('touchmove', handleSelectionMove);
      gameContainer.addEventListener('touchend', handleSelectionEnd);


      // Start the game when the page loads.
      startGame();
    </script>
</body>
</html>