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<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>数学小天才</title>
    <script src="https://cdn.tailwindcss.com"></script>
    <script>
      tailwind.config = {
        theme: {
          extend: {
            fontFamily: {
              sans: ['Inter', 'sans-serif'],
            },
            animation: {
              'float': 'float 3s ease-in-out infinite',
              'pulse-slow': 'pulse 3s cubic-bezier(0.4, 0, 0.6, 1) infinite',
              'fade-in': 'fadeIn 0.3s ease-out',
              'fade-out': 'fadeOut 0.3s ease-out',
              'slide-up': 'slideUp 0.8s cubic-bezier(0.34, 1.56, 0.64, 1)',
            },
            keyframes: {
              float: {
                '0%, 100%': { transform: 'translateY(0)' },
                '50%': { transform: 'translateY(-10px)' },
              },
              fadeIn: {
                '0%': { opacity: '0', transform: 'translateY(10px)' },
                '100%': { opacity: '1', transform: 'translateY(0)' },
              },
              fadeOut: {
                '0%': { opacity: '1', transform: 'translateY(0)' },
                '100%': { opacity: '0', transform: 'translateY(-10px)' },
              },
              slideUp: {
                '0%': { transform: 'translateY(100%)', opacity: '0' },
                '100%': { transform: 'translateY(0)', opacity: '1' },
              },
            }
          }
        }
      }
    </script>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap" rel="stylesheet">
    <style>
      @keyframes confetti-fall {
        0% { transform: translateY(-100px) rotate(0deg); opacity: 1; }
        100% { transform: translateY(100vh) rotate(360deg); opacity: 0; }
      }
      
      .animate-confetti {
        animation: confetti-fall 2s linear forwards;
      }
      
      .linear-card {
        background: rgba(255, 255, 255, 0.6);
        backdrop-filter: blur(12px);
        border: 1px solid rgba(255, 255, 255, 0.2);
        box-shadow: 0 8px 32px rgba(31, 38, 135, 0.05);
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      }
      
      .linear-card:hover {
        box-shadow: 0 8px 32px rgba(31, 38, 135, 0.1);
        transform: translateY(-2px);
      }
      
      .btn-transition {
        transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
      }
      
      .btn-scale:hover {
        transform: scale(1.02);
      }
      
      .btn-scale:active {
        transform: scale(0.98);
      }
      
      .elevate-on-hover {
        transition: transform 0.2s ease, box-shadow 0.2s ease;
      }
      
      .elevate-on-hover:hover {
        transform: translateY(-4px);
        box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
      }
      
      .slide-in {
        animation: slideIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
      }
      
      @keyframes slideIn {
        from { transform: translateY(20px); opacity: 0; }
        to { transform: translateY(0); opacity: 1; }
      }
      
      .fade-in {
        animation: fadeIn 0.3s ease-out forwards;
      }
      
      .bounce-animation {
        animation: bounce 0.5s alternate infinite ease-in-out;
      }
      
      @keyframes bounce {
        from { transform: translateY(-5px); }
        to { transform: translateY(5px); }
      }
      
      /* Celebration animation */
      .celebration-item {
        position: absolute;
        opacity: 0;
        z-index: 100;
      }
      
      @keyframes celebrationRise {
        0% {
          transform: translateY(100vh) scale(0);
          opacity: 1;
        }
        40% {
          transform: translateY(60vh) scale(1);
          opacity: 0.8;
        }
        80% {
          opacity: 0.5;
        }
        100% {
          transform: translateY(-100px) scale(0.5);
          opacity: 0;
        }
      }
      
      /* Mobile game mode styles */
      .game-mode .game-header,
      .game-mode .game-footer {
        display: none;
      }
      
      .game-mode .game-wrapper {
        margin-top: 0;
        padding-top: 0.5rem;
      }
      
      .game-mode .answer-options {
        grid-template-columns: 1fr !important;
        gap: 0.5rem !important;
      }
      
      .game-mode .answer-btn {
        padding: 0.75rem !important;
        font-size: 1rem !important;
      }
      
      .game-mode .visual-aid {
        gap: 0.25rem !important;
      }
      
      .game-mode .visual-item {
        width: 1.75rem !important;
        height: 1.75rem !important;
        font-size: 0.75rem !important;
      }
      
      .game-mode #question {
        font-size: 2rem !important;
        margin-bottom: 0.5rem !important;
      }
      
      .game-mode .character {
        font-size: 3rem !important;
      }
      
      .game-mode .stats-bar {
        padding: 0.5rem !important;
        margin-bottom: 0.5rem !important;
      }
      
      .game-mode .stats-item {
        font-size: 0.875rem !important;
      }
    </style>
</head>
<body class="bg-gradient-to-br from-gray-50 to-gray-100 min-h-screen font-sans text-gray-800">
    <div id="app" class="container mx-auto px-4 py-4 max-w-4xl relative">
        <!-- Header (hidden during gameplay) -->
        <header class="game-header text-center mb-6 fade-in">
            <div class="w-16 h-16 mx-auto mb-4 linear-card rounded-full flex items-center justify-center shadow-sm hover:shadow-md transition-all elevate-on-hover">
                <i class="fas fa-calculator text-2xl text-indigo-500"></i>
            </div>
            <h1 class="text-2xl font-bold text-gray-800 mb-2 tracking-tight">数学小天才</h1>
            <p class="text-xs text-gray-500">快乐学习 · 轻松进步</p>
        </header>

        <!-- Main wrapper -->
        <main class="game-wrapper">
            <!-- Game selection screen -->
            <div id="game-selection" class="p-4 linear-card rounded-xl overflow-hidden slide-in">
                <h2 class="text-xl font-semibold text-center text-gray-700 mb-4">选择游戏模式</h2>
                
                <div class="grid grid-cols-1 gap-3 mb-6">
                    <button onclick="startGame('addition')" class="linear-card btn-transition btn-scale py-3 px-4 rounded-lg hover:bg-indigo-50/50 text-indigo-600 font-medium flex items-center justify-center gap-2 border border-indigo-100">
                        <i class="fas fa-plus text-lg"></i>
                        <span>加法练习</span>
                    </button>
                    <button onclick="startGame('subtraction')" class="linear-card btn-transition btn-scale py-3 px-4 rounded-lg hover:bg-purple-50/50 text-purple-600 font-medium flex items-center justify-center gap-2 border border-purple-100">
                        <i class="fas fa-minus text-lg"></i> 
                        <span>减法练习</span>
                    </button>
                </div>
                
                <div class="space-y-2">
                    <h3 class="text-base font-medium text-gray-700">难度设置</h3>
                    <div class="grid grid-cols-3 gap-2">
                        <label>
                            <input type="radio" name="difficulty" value="easy" checked class="hidden peer">
                            <div class="h-full linear-card peer-checked:bg-indigo-50/50 peer-checked:border-indigo-200 peer-checked:text-indigo-600 border border-gray-100 rounded-lg p-2 text-center cursor-pointer transition-all flex flex-col items-center">
                                <i class="fas fa-smile text-lg mb-1"></i>
                                <span class="text-xs">简单模式</span>
                                <span class="text-[0.6rem] text-gray-500 mt-0.5">数字1-5</span>
                            </div>
                        </label>
                        <label>
                            <input type="radio" name="difficulty" value="medium" class="hidden peer">
                            <div class="h-full linear-card peer-checked:bg-purple-50/50 peer-checked:border-purple-200 peer-checked:text-purple-600 border border-gray-100 rounded-lg p-2 text-center cursor-pointer transition-all flex flex-col items-center">
                                <i class="fas fa-meh text-lg mb-1"></i>
                                <span class="text-xs">中等模式</span>
                                <span class="text-[0.6rem] text-gray-500 mt-0.5">数字1-10</span>
                            </div>
                        </label>
                        <label>
                            <input type="radio" name="difficulty" value="hard" class="hidden peer">
                            <div class="h-full linear-card peer-checked:bg-rose-50/50 peer-checked:border-rose-200 peer-checked:text-rose-600 border border-gray-100 rounded-lg p-2 text-center cursor-pointer transition-all flex flex-col items-center">
                                <i class="fas fa-frown text-lg mb-1"></i>
                                <span class="text-xs">困难模式</span>
                                <span class="text-[0.6rem] text-gray-500 mt-0.5">数字1-20</span>
                            </div>
                        </label>
                    </div>
                </div>
            </div>

            <!-- Game area -->
            <div id="game-area" class="hidden">
                <div class="flex justify-between items-center mb-3 linear-card bg-gradient-to-r from-indigo-50/50 to-purple-50/50 p-2 rounded-lg border border-gray-100 stats-bar">
                    <div class="flex items-center gap-1 stats-item">
                        <i class="fas fa-star text-amber-400 text-sm"></i>
                        <span>得分: <span id="score" class="font-medium text-indigo-600">0</span></span>
                    </div>
                    <div class="flex items-center gap-1 stats-item">
                        <i class="fas fa-clock text-purple-500 text-sm"></i>
                        <span>时间: <span id="time" class="font-medium text-purple-600">60</span></span>
                    </div>
                    <button onclick="backToMenu()" class="text-xs bg-white/70 px-2 py-0.5 rounded-full border border-gray-200 text-gray-600 hover:bg-white">
                        <i class="fas fa-times"></i>
                    </button>
                </div>

                <!-- Question card -->
                <div class="linear-card rounded-lg p-3 mb-3">
                    <div id="question" class="text-2xl font-bold text-center mb-2"></div>
                    <div id="visual-aid" class="visual-aid flex justify-center items-center flex-wrap gap-1 mb-2"></div>
                </div>

                <!-- Answer options -->
                <div id="answer-options" class="answer-options grid grid-cols-2 gap-2 mb-3"></div>
                
                <!-- Feedback area -->
                <div class="linear-card rounded-lg p-3 overflow-hidden">
                    <div id="feedback" class="text-center text-xs mb-2"></div>
                    <div id="character" class="character text-4xl text-center bounce-animation">🤔</div>
                </div>

                <!-- Next button -->
                <div id="next-btn-container" class="hidden mt-3">
                    <button id="next-btn" onclick="nextQuestion()" 
                        class="w-full py-2 answer-btn linear-card bg-gradient-to-r from-indigo-500 to-purple-500 text-white rounded-lg font-medium btn-transition btn-scale hover:from-indigo-600 hover:to-purple-600 hover:shadow-md">
                        下一题 <i class="fas fa-arrow-right ml-1"></i>
                    </button>
                </div>
            </div>

            <!-- Results screen -->
            <div id="results-screen" class="hidden">
                <div class="linear-card rounded-xl p-4 text-center slide-up">
                    <div class="w-16 h-16 mx-auto mb-4 bg-gradient-to-r from-indigo-500 to-purple-500 text-white rounded-full flex items-center justify-center text-2xl shadow-sm">
                        🎓
                    </div>
                    <h2 class="text-xl font-bold mb-2">游戏完成!</h2>
                    <p class="text-gray-600 mb-3 text-xs">你的精彩表现值得赞赏</p>
                    
                    <div class="linear-card rounded-lg p-4 inline-block mb-4 bg-gradient-to-r from-indigo-50/50 to-purple-50/50">
                        <p class="text-gray-600 mb-1 text-xs">最终得分</p>
                        <p id="final-score" class="text-3xl font-bold bg-gradient-to-r from-indigo-600 to-purple-600 bg-clip-text text-transparent">0</p>
                    </div>
                    
                    <div class="flex flex-col gap-2">
                        <button onclick="restartGame()" 
                            class="linear-card btn-transition btn-scale py-2 px-3 bg-indigo-500 hover:bg-indigo-600 text-white rounded-lg text-xs font-medium flex items-center justify-center gap-1">
                            <i class="fas fa-redo text-xs"></i> 再玩一次
                        </button>
                        <button onclick="backToMenu()" 
                            class="linear-card btn-transition btn-scale py-2 px-3 bg-white hover:bg-gray-50 text-gray-700 border border-gray-200 rounded-lg text-xs font-medium flex items-center justify-center gap-1">
                            <i class="fas fa-home text-xs"></i> 返回菜单
                        </button>
                    </div>
                </div>
            </div>
        </main>

        <footer class="game-footer text-center mt-6 text-gray-500 text-xs">
            <p><i class="fas fa-heart text-rose-400"></i> 为孩子打造 · © 2025 数学小天才</p>
        </footer>
    </div>

    <script>
        // Game variables
        let currentGameType = '';
        let currentDifficulty = 'easy';
        let score = 0;
        let timeLeft = 60;
        let timer;
        let currentQuestion = {};
        let correctAnswer;

        // DOM elements
        const appElement = document.getElementById('app');
        const gameSelection = document.getElementById('game-selection');
        const gameArea = document.getElementById('game-area');
        const resultsScreen = document.getElementById('results-screen');
        const questionElement = document.getElementById('question');
        const visualAidElement = document.getElementById('visual-aid');
        const answerOptionsElement = document.getElementById('answer-options');
        const feedbackElement = document.getElementById('feedback');
        const characterElement = document.getElementById('character');
        const scoreElement = document.getElementById('score');
        const timeElement = document.getElementById('time');
        const finalScoreElement = document.getElementById('final-score');
        const nextButtonContainer = document.getElementById('next-btn-container');
        const nextButton = document.getElementById('next-btn');

        // Start game
        function startGame(gameType) {
            currentGameType = gameType;
            const selectedDifficulty = document.querySelector('input[name="difficulty"]:checked');
            currentDifficulty = selectedDifficulty ? selectedDifficulty.value : 'easy';
            score = 0;
            timeLeft = 60;
            
            // Enter game mode (hide header/footer)
            appElement.classList.add('game-mode');
            
            gameSelection.classList.add('hidden');
            gameArea.classList.remove('hidden');
            
            updateScore();
            updateTimer();
            startTimer();
            generateQuestion();
        }

        // Timer functions
        function startTimer() {
            clearInterval(timer);
            timer = setInterval(() => {
                timeLeft--;
                updateTimer();
                
                if (timeLeft <= 0) {
                    endGame();
                }
            }, 1000);
        }

        function updateTimer() {
            timeElement.textContent = timeLeft;
            
            // Change color when time is running out
            if (timeLeft <= 10) {
                timeElement.classList.remove('text-purple-600');
                timeElement.classList.add('text-rose-500');
            } else {
                timeElement.classList.remove('text-rose-500');
                timeElement.classList.add('text-purple-600');
            }
        }

        // Generate question
        function generateQuestion() {
            nextButtonContainer.classList.add('hidden');
            feedbackElement.textContent = '';
            feedbackElement.className = 'text-center text-xs mb-2';
            characterElement.textContent = '🤔';
            characterElement.classList.add('bounce-animation');
            characterElement.style.animation = '';
            
            let num1, num2, maxNumber;
            
            // Set max number based on difficulty
            switch(currentDifficulty) {
                case 'easy':
                    maxNumber = 5;
                    break;
                case 'medium':
                    maxNumber = 10;
                    break;
                case 'hard':
                    maxNumber = 20;
                    break;
            }
            
            if (currentGameType === 'addition') {
                num1 = Math.floor(Math.random() * maxNumber) + 1;
                num2 = Math.floor(Math.random() * maxNumber) + 1;
                correctAnswer = num1 + num2;
                questionElement.textContent = `${num1} + ${num2} = ?`;
                
                // Create visual aid for addition
                visualAidElement.innerHTML = '';
                for (let i = 0; i < num1; i++) {
                    visualAidElement.innerHTML += `<div class="visual-item w-6 h-6 bg-gradient-to-br from-blue-400 to-blue-500 rounded-md flex items-center justify-center text-white font-bold text-xs shadow-sm">🍎</div>`;
                }
                visualAidElement.innerHTML += `<div class="text-lg font-bold mx-1 text-gray-500">+</div>`;
                for (let i = 0; i < num2; i++) {
                    visualAidElement.innerHTML += `<div class="visual-item w-6 h-6 bg-gradient-to-br from-red-400 to-red-500 rounded-md flex items-center justify-center text-white font-bold text-xs shadow-sm">🍐</div>`;
                }
            } else { // Subtraction
                num1 = Math.floor(Math.random() * maxNumber) + 1;
                num2 = Math.floor(Math.random() * num1) + 1;
                correctAnswer = num1 - num2;
                questionElement.textContent = `${num1} - ${num2} = ?`;
                
                // Create visual aid for subtraction
                visualAidElement.innerHTML = '';
                for (let i = 0; i < num1; i++) {
                    visualAidElement.innerHTML += `<div class="visual-item w-6 h-6 bg-gradient-to-br from-green-400 to-green-500 rounded-md flex items-center justify-center text-white font-bold text-xs shadow-sm">🐶</div>`;
                }
                visualAidElement.innerHTML += `<div class="text-lg font-bold mx-1 text-gray-500">-</div>`;
                for (let i = 0; i < num2; i++) {
                    visualAidElement.innerHTML += `<div class="visual-item w-6 h-6 bg-gradient-to-br from-yellow-400 to-yellow-500 rounded-md flex items-center justify-center text-white font-bold text-xs shadow-sm">🏠</div>`;
                }
            }
            
            // Generate answer options
            generateAnswerOptions(correctAnswer, maxNumber);
        }

        function generateAnswerOptions(correct, max) {
            answerOptionsElement.innerHTML = '';
            let options = [correct];
            
            // Generate 3 incorrect answers
            while (options.length < 4) {
                let wrongAnswer;
                if (currentGameType === 'addition') {
                    wrongAnswer = Math.floor(Math.random() * (max * 2)) + 1;
                } else {
                    wrongAnswer = Math.floor(Math.random() * max) + 1;
                }
                
                if (wrongAnswer !== correct && !options.includes(wrongAnswer)) {
                    options.push(wrongAnswer);
                }
            }
            
            // Shuffle options
            options = shuffleArray(options);
            
            // Create buttons for each option
            options.forEach(option => {
                const button = document.createElement('button');
                button.className = 'answer-btn linear-card btn-transition py-2 rounded-lg hover:bg-gray-50/50 border border-gray-100 text-sm font-medium';
                button.textContent = option;
                button.onclick = () => checkAnswer(option);
                answerOptionsElement.appendChild(button);
            });
        }

        // Check answer
        function checkAnswer(selectedAnswer) {
            // Disable all answer buttons
            const buttons = answerOptionsElement.querySelectorAll('button');
            buttons.forEach(button => {
                button.disabled = true;
                button.classList.remove('hover:bg-gray-50/50');
                if (parseInt(button.textContent) === correctAnswer) {
                    button.classList.add('bg-green-50/50', 'border-green-200', 'text-green-600');
                } else if (parseInt(button.textContent) === selectedAnswer && selectedAnswer !== correctAnswer) {
                    button.classList.add('bg-rose-50/50', 'border-rose-200', 'text-rose-600');
                } else {
                    button.classList.add('opacity-70');
                }
            });
            
            if (selectedAnswer === correctAnswer) {
                // Correct answer
                score += 10;
                updateScore();
                feedbackElement.textContent = '✓ 太棒了!答案正确';
                feedbackElement.classList.add('text-green-500');
                characterElement.textContent = '🎉';
                characterElement.classList.remove('bounce-animation');
                characterElement.style.animation = 'none';
                void characterElement.offsetWidth; // Trigger reflow
                characterElement.style.animation = 'bounce 0.5s alternate infinite ease-in-out';
                createRisingCelebration();
                
                buttons.forEach(button => {
                    if (parseInt(button.textContent) === correctAnswer) {
                        button.classList.add('animate-pulse');
                        setTimeout(() => button.classList.remove('animate-pulse'), 1500);
                    }
                });
            } else {
                // Wrong answer
                feedbackElement.textContent = `✕ 正确答案是 ${correctAnswer}`;
                feedbackElement.classList.add('text-rose-500');
                characterElement.textContent = '😢';
                characterElement.style.animation = 'bounce 0.2s reverse 2';
            }
            
            nextButtonContainer.classList.remove('hidden');
        }

        // Create celebration effects (bottom-up animation)
        function createRisingCelebration() {
            const emojis = ['🎉', '✨', '🌟', '🎈', '🥳', '👍', '👏'];
            const colors = ['#3B82F6', '#10B981', '#F59E0B', '#EF4444', '#8B5CF6', '#EC4899'];
            
            for (let i = 0; i < 15; i++) {
                setTimeout(() => {
                    const element = document.createElement('div');
                    element.className = 'celebration-item text-2xl';
                    element.textContent = emojis[Math.floor(Math.random() * emojis.length)];
                    
                    // Random left position
                    const randomLeft = 5 + Math.random() * 90;
                    element.style.left = `${randomLeft}%`;
                    
                    // Random delay and duration
                    const randomDelay = Math.random() * 0.5;
                    const randomDuration = 1 + Math.random() * 1;
                    
                    // Random color
                    const randomColor = colors[Math.floor(Math.random() * colors.length)];
                    element.style.color = randomColor;
                    
                    element.style.animation = `celebrationRise ${randomDuration}s ${randomDelay}s forwards`;
                    
                    document.body.appendChild(element);
                    
                    // Remove element after animation
                    setTimeout(() => {
                        element.remove();
                    }, (randomDelay + randomDuration) * 1000);
                }, Math.random() * 300);
            }
        }

        // Next question
        function nextQuestion() {
            generateQuestion();
        }

        // End game
        function endGame() {
            clearInterval(timer);
            gameArea.classList.add('hidden');
            resultsScreen.classList.remove('hidden');
            finalScoreElement.textContent = score;
        }

        // Restart game
        function restartGame() {
            resultsScreen.classList.add('hidden');
            startGame(currentGameType);
        }

        // Back to menu
        function backToMenu() {
            appElement.classList.remove('game-mode');
            resultsScreen.classList.add('hidden');
            gameArea.classList.add('hidden');
            gameSelection.classList.remove('hidden');
        }

        // Update score
        function updateScore() {
            scoreElement.textContent = score;
        }

        // Utility functions
        function shuffleArray(array) {
            for (let i = array.length - 1; i > 0; i--) {
                const j = Math.floor(Math.random() * (i + 1));
                [array[i], array[j]] = [array[j], array[i]];
            }
            return array;
        }
    </script>
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