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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>Zhuyin Bopomofo Learning App</title>
    <script src="https://cdn.tailwindcss.com"></script>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
    <style>
        @import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@400;700&display=swap');
        
        body {
            font-family: 'Noto Sans TC', sans-serif;
            background-color: #f8f9fa;
        }
        
        .zhuyin-char {
            font-size: 4rem;
            line-height: 1;
            color: #3b82f6;
        }
        
        .lesson-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        
        .character-card {
            transition: all 0.3s ease;
        }
        
        .character-card:hover {
            transform: scale(1.05);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        
        .progress-bar {
            height: 8px;
            border-radius: 4px;
            background-color: #e5e7eb;
        }
        
        .progress-fill {
            height: 100%;
            border-radius: 4px;
            background-color: #10b981;
            transition: width 0.3s ease;
        }
        
        .correct-answer {
            animation: correctPulse 0.5s;
        }
        
        .wrong-answer {
            animation: wrongShake 0.5s;
        }
        
        @keyframes correctPulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.1); }
            100% { transform: scale(1); }
        }
        
        @keyframes wrongShake {
            0%, 100% { transform: translateX(0); }
            20%, 60% { transform: translateX(-5px); }
            40%, 80% { transform: translateX(5px); }
        }
        
        .tab-active {
            border-bottom: 3px solid #3b82f6;
            color: #3b82f6;
            font-weight: bold;
        }
    </style>
</head>
<body class="min-h-screen">
    <div class="container mx-auto px-4 py-8 max-w-6xl">
        <!-- Header -->
        <header class="text-center mb-12">
            <h1 class="text-4xl font-bold text-gray-800 mb-2">Zhuyin Bopomofo Learning App</h1>
            <p class="text-lg text-gray-600">Master the phonetic system for learning Mandarin Chinese</p>
        </header>
        
        <!-- Main Content -->
        <div class="bg-white rounded-xl shadow-lg overflow-hidden">
            <!-- Tabs Navigation -->
            <div class="flex border-b border-gray-200">
                <button id="lessons-tab" class="flex-1 py-4 px-6 text-center font-medium text-gray-700 hover:text-blue-500 focus:outline-none tab-active">
                    <i class="fas fa-book-open mr-2"></i> Lessons
                </button>
                <button id="practice-tab" class="flex-1 py-4 px-6 text-center font-medium text-gray-700 hover:text-blue-500 focus:outline-none">
                    <i class="fas fa-pencil-alt mr-2"></i> Practice
                </button>
                <button id="progress-tab" class="flex-1 py-4 px-6 text-center font-medium text-gray-700 hover:text-blue-500 focus:outline-none">
                    <i class="fas fa-chart-line mr-2"></i> Progress
                </button>
            </div>
            
            <!-- Tab Content -->
            <div class="p-6">
                <!-- Lessons Tab Content -->
                <div id="lessons-content">
                    <h2 class="text-2xl font-bold text-gray-800 mb-6">Zhuyin Lessons</h2>
                    
                    <div class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
                        <!-- Lesson 1: Initials -->
                        <div class="lesson-card bg-white border border-gray-200 rounded-lg p-6 shadow-sm transition duration-300 cursor-pointer" onclick="loadLesson('initials')">
                            <div class="flex items-center mb-4">
                                <div class="bg-blue-100 p-3 rounded-full mr-4">
                                    <i class="fas fa-volume-up text-blue-500 text-xl"></i>
                                </div>
                                <h3 class="text-xl font-semibold text-gray-800">Initial Consonants</h3>
                            </div>
                            <p class="text-gray-600 mb-4">Learn the 21 initial consonant sounds in Zhuyin.</p>
                            <div class="flex justify-between items-center">
                                <span class="text-sm text-gray-500">21 characters</span>
                                <span class="text-sm font-medium text-blue-500">Start Lesson →</span>
                            </div>
                        </div>
                        
                        <!-- Lesson 2: Medials -->
                        <div class="lesson-card bg-white border border-gray-200 rounded-lg p-6 shadow-sm transition duration-300 cursor-pointer" onclick="loadLesson('medials')">
                            <div class="flex items-center mb-4">
                                <div class="bg-green-100 p-3 rounded-full mr-4">
                                    <i class="fas fa-comment text-green-500 text-xl"></i>
                                </div>
                                <h3 class="text-xl font-semibold text-gray-800">Medial Vowels</h3>
                            </div>
                            <p class="text-gray-600 mb-4">Master the 3 medial vowel sounds that combine with initials.</p>
                            <div class="flex justify-between items-center">
                                <span class="text-sm text-gray-500">3 characters</span>
                                <span class="text-sm font-medium text-blue-500">Start Lesson →</span>
                            </div>
                        </div>
                        
                        <!-- Lesson 3: Finals -->
                        <div class="lesson-card bg-white border border-gray-200 rounded-lg p-6 shadow-sm transition duration-300 cursor-pointer" onclick="loadLesson('finals')">
                            <div class="flex items-center mb-4">
                                <div class="bg-purple-100 p-3 rounded-full mr-4">
                                    <i class="fas fa-spell-check text-purple-500 text-xl"></i>
                                </div>
                                <h3 class="text-xl font-semibold text-gray-800">Final Sounds</h3>
                            </div>
                            <p class="text-gray-600 mb-4">Learn the 13 final sounds that complete Zhuyin syllables.</p>
                            <div class="flex justify-between items-center">
                                <span class="text-sm text-gray-500">13 characters</span>
                                <span class="text-sm font-medium text-blue-500">Start Lesson →</span>
                            </div>
                        </div>
                        
                        <!-- Lesson 4: Tones -->
                        <div class="lesson-card bg-white border border-gray-200 rounded-lg p-6 shadow-sm transition duration-300 cursor-pointer" onclick="loadLesson('tones')">
                            <div class="flex items-center mb-4">
                                <div class="bg-yellow-100 p-3 rounded-full mr-4">
                                    <i class="fas fa-music text-yellow-500 text-xl"></i>
                                </div>
                                <h3 class="text-xl font-semibold text-gray-800">Tones</h3>
                            </div>
                            <p class="text-gray-600 mb-4">Understand the 4 tones and neutral tone in Mandarin.</p>
                            <div class="flex justify-between items-center">
                                <span class="text-sm text-gray-500">5 tone marks</span>
                                <span class="text-sm font-medium text-blue-500">Start Lesson →</span>
                            </div>
                        </div>
                        
                        <!-- Lesson 5: Combined -->
                        <div class="lesson-card bg-white border border-gray-200 rounded-lg p-6 shadow-sm transition duration-300 cursor-pointer" onclick="loadLesson('combined')">
                            <div class="flex items-center mb-4">
                                <div class="bg-red-100 p-3 rounded-full mr-4">
                                    <i class="fas fa-random text-red-500 text-xl"></i>
                                </div>
                                <h3 class="text-xl font-semibold text-gray-800">Combined Sounds</h3>
                            </div>
                            <p class="text-gray-600 mb-4">Practice combining initials, medials and finals.</p>
                            <div class="flex justify-between items-center">
                                <span class="text-sm text-gray-500">All characters</span>
                                <span class="text-sm font-medium text-blue-500">Start Lesson →</span>
                            </div>
                        </div>
                    </div>
                    
                    <!-- Lesson Detail View (hidden by default) -->
                    <div id="lesson-detail" class="hidden mt-8">
                        <div class="flex justify-between items-center mb-6">
                            <h2 id="lesson-title" class="text-2xl font-bold text-gray-800"></h2>
                            <button onclick="backToLessons()" class="flex items-center text-blue-500 hover:text-blue-700">
                                <i class="fas fa-arrow-left mr-2"></i> Back to Lessons
                            </button>
                        </div>
                        
                        <div id="lesson-description" class="mb-6 text-gray-700"></div>
                        
                        <div id="lesson-characters" class="grid grid-cols-2 sm:grid-cols-3 md:grid-cols-4 lg:grid-cols-6 gap-4"></div>
                    </div>
                </div>
                
                <!-- Practice Tab Content -->
                <div id="practice-content" class="hidden">
                    <h2 class="text-2xl font-bold text-gray-800 mb-6">Practice Zhuyin Characters</h2>
                    
                    <div class="bg-blue-50 rounded-lg p-6 mb-8">
                        <div class="flex flex-col md:flex-row items-center">
                            <div class="md:w-1/2 mb-4 md:mb-0">
                                <h3 class="text-xl font-semibold text-gray-800 mb-2">Test Your Knowledge</h3>
                                <p class="text-gray-600">Listen to the pronunciation and select the correct Zhuyin character.</p>
                            </div>
                            <div class="md:w-1/2 flex justify-end">
                                <button id="start-practice" class="bg-blue-500 hover:bg-blue-600 text-white font-medium py-2 px-6 rounded-lg transition duration-300 flex items-center">
                                    <i class="fas fa-play mr-2"></i> Start Practice
                                </button>
                            </div>
                        </div>
                    </div>
                    
                    <div id="practice-session" class="hidden">
                        <div class="bg-white border border-gray-200 rounded-lg p-6 shadow-sm mb-6">
                            <div class="flex justify-between items-center mb-4">
                                <span id="progress-text" class="text-sm font-medium text-gray-500">Question 1 of 10</span>
                                <div class="w-32 bg-gray-200 rounded-full h-2.5">
                                    <div id="progress-bar" class="bg-blue-600 h-2.5 rounded-full" style="width: 10%"></div>
                                </div>
                            </div>
                            
                            <div class="text-center py-8">
                                <button id="play-sound" class="bg-green-500 hover:bg-green-600 text-white font-medium py-3 px-8 rounded-full transition duration-300 flex items-center mx-auto">
                                    <i class="fas fa-volume-up mr-2"></i> Play Sound
                                </button>
                                <p class="text-gray-500 mt-4">Listen to the pronunciation and select the correct character below.</p>
                            </div>
                            
                            <div id="answer-options" class="grid grid-cols-2 sm:grid-cols-3 md:grid-cols-4 gap-4 mt-6"></div>
                        </div>
                        
                        <div id="feedback" class="hidden">
                            <div id="correct-feedback" class="bg-green-50 border border-green-200 rounded-lg p-4 mb-4 hidden">
                                <div class="flex items-center">
                                    <div class="bg-green-100 p-2 rounded-full mr-3">
                                        <i class="fas fa-check text-green-500"></i>
                                    </div>
                                    <div>
                                        <h4 class="font-medium text-green-800">Correct!</h4>
                                        <p class="text-green-600 text-sm">Good job! That was the right answer.</p>
                                    </div>
                                </div>
                            </div>
                            
                            <div id="wrong-feedback" class="bg-red-50 border border-red-200 rounded-lg p-4 mb-4 hidden">
                                <div class="flex items-center">
                                    <div class="bg-red-100 p-2 rounded-full mr-3">
                                        <i class="fas fa-times text-red-500"></i>
                                    </div>
                                    <div>
                                        <h4 class="font-medium text-red-800">Incorrect</h4>
                                        <p id="correct-answer-text" class="text-red-600 text-sm">The correct answer was: ㄅ (b)</p>
                                    </div>
                                </div>
                            </div>
                            
                            <button id="next-question" class="w-full bg-blue-500 hover:bg-blue-600 text-white font-medium py-3 px-6 rounded-lg transition duration-300">
                                Next Question <i class="fas fa-arrow-right ml-2"></i>
                            </button>
                        </div>
                    </div>
                    
                    <div id="practice-results" class="hidden">
                        <div class="bg-white border border-gray-200 rounded-lg p-6 shadow-sm">
                            <div class="text-center mb-6">
                                <div class="w-24 h-24 bg-green-100 rounded-full flex items-center justify-center mx-auto mb-4">
                                    <i class="fas fa-trophy text-green-500 text-4xl"></i>
                                </div>
                                <h3 class="text-2xl font-bold text-gray-800 mb-2">Practice Complete!</h3>
                                <p id="results-score" class="text-xl text-gray-600">You scored 8 out of 10</p>
                            </div>
                            
                            <div class="grid grid-cols-1 md:grid-cols-2 gap-6 mb-8">
                                <div class="bg-blue-50 rounded-lg p-4">
                                    <h4 class="font-medium text-gray-800 mb-2">Correct Answers</h4>
                                    <div class="flex items-center">
                                        <div class="text-3xl font-bold text-blue-500 mr-3" id="correct-count">8</div>
                                        <div class="progress-bar w-full">
                                            <div class="progress-fill" style="width: 80%"></div>
                                        </div>
                                    </div>
                                </div>
                                
                                <div class="bg-red-50 rounded-lg p-4">
                                    <h4 class="font-medium text-gray-800 mb-2">Incorrect Answers</h4>
                                    <div class="flex items-center">
                                        <div class="text-3xl font-bold text-red-500 mr-3" id="incorrect-count">2</div>
                                        <div class="progress-bar w-full">
                                            <div class="progress-fill bg-red-500" style="width: 20%"></div>
                                        </div>
                                    </div>
                                </div>
                            </div>
                            
                            <div class="flex flex-col sm:flex-row gap-4">
                                <button onclick="restartPractice()" class="flex-1 bg-blue-500 hover:bg-blue-600 text-white font-medium py-3 px-6 rounded-lg transition duration-300">
                                    <i class="fas fa-redo mr-2"></i> Try Again
                                </button>
                                <button onclick="backToLessons()" class="flex-1 bg-gray-200 hover:bg-gray-300 text-gray-800 font-medium py-3 px-6 rounded-lg transition duration-300">
                                    <i class="fas fa-book-open mr-2"></i> Back to Lessons
                                </button>
                            </div>
                        </div>
                    </div>
                </div>
                
                <!-- Progress Tab Content -->
                <div id="progress-content" class="hidden">
                    <h2 class="text-2xl font-bold text-gray-800 mb-6">Your Learning Progress</h2>
                    
                    <div class="grid grid-cols-1 md:grid-cols-2 gap-6 mb-8">
                        <div class="bg-white border border-gray-200 rounded-lg p-6 shadow-sm">
                            <h3 class="text-lg font-semibold text-gray-800 mb-4">Overall Progress</h3>
                            <div class="flex items-center mb-2">
                                <div class="w-12 h-12 bg-blue-100 rounded-full flex items-center justify-center mr-4">
                                    <i class="fas fa-chart-pie text-blue-500"></i>
                                </div>
                                <div class="flex-1">
                                    <div class="flex justify-between mb-1">
                                        <span class="text-sm font-medium text-gray-600">Characters Learned</span>
                                        <span id="learned-percent" class="text-sm font-medium text-gray-600">25%</span>
                                    </div>
                                    <div class="progress-bar">
                                        <div id="overall-progress" class="progress-fill" style="width: 25%"></div>
                                    </div>
                                </div>
                            </div>
                        </div>
                        
                        <div class="bg-white border border-gray-200 rounded-lg p-6 shadow-sm">
                            <h3 class="text-lg font-semibold text-gray-800 mb-4">Practice Accuracy</h3>
                            <div class="flex items-center mb-2">
                                <div class="w-12 h-12 bg-green-100 rounded-full flex items-center justify-center mr-4">
                                    <i class="fas fa-check-circle text-green-500"></i>
                                </div>
                                <div class="flex-1">
                                    <div class="flex justify-between mb-1">
                                        <span class="text-sm font-medium text-gray-600">Correct Answers</span>
                                        <span id="accuracy-percent" class="text-sm font-medium text-gray-600">75%</span>
                                    </div>
                                    <div class="progress-bar">
                                        <div id="accuracy-progress" class="progress-fill bg-green-500" style="width: 75%"></div>
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                    
                    <div class="bg-white border border-gray-200 rounded-lg p-6 shadow-sm">
                        <h3 class="text-lg font-semibold text-gray-800 mb-4">Lesson Completion</h3>
                        
                        <div class="space-y-4">
                            <!-- Initials Progress -->
                            <div>
                                <div class="flex justify-between mb-1">
                                    <span class="font-medium text-gray-700">Initial Consonants</span>
                                    <span class="text-sm font-medium text-gray-600">8/21</span>
                                </div>
                                <div class="progress-bar">
                                    <div class="progress-fill" style="width: 38%"></div>
                                </div>
                            </div>
                            
                            <!-- Medials Progress -->
                            <div>
                                <div class="flex justify-between mb-1">
                                    <span class="font-medium text-gray-700">Medial Vowels</span>
                                    <span class="text-sm font-medium text-gray-600">1/3</span>
                                </div>
                                <div class="progress-bar">
                                    <div class="progress-fill" style="width: 33%"></div>
                                </div>
                            </div>
                            
                            <!-- Finals Progress -->
                            <div>
                                <div class="flex justify-between mb-1">
                                    <span class="font-medium text-gray-700">Final Sounds</span>
                                    <span class="text-sm font-medium text-gray-600">4/13</span>
                                </div>
                                <div class="progress-bar">
                                    <div class="progress-fill" style="width: 31%"></div>
                                </div>
                            </div>
                            
                            <!-- Tones Progress -->
                            <div>
                                <div class="flex justify-between mb-1">
                                    <span class="font-medium text-gray-700">Tones</span>
                                    <span class="text-sm font-medium text-gray-600">2/5</span>
                                </div>
                                <div class="progress-bar">
                                    <div class="progress-fill" style="width: 40%"></div>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>

    <script>
        // Zhuyin character data
        const zhuyinData = {
            initials: {
                title: "Initial Consonants",
                description: "Initial consonants are the starting sounds of Zhuyin syllables. There are 21 initial consonants in total.",
                characters: [
                    { char: "ㄅ", pinyin: "b", example: "八 (bā)" },
                    { char: "ㄆ", pinyin: "p", example: "怕 (pà)" },
                    { char: "ㄇ", pinyin: "m", example: "媽 (mā)" },
                    { char: "ㄈ", pinyin: "f", example: "發 (fā)" },
                    { char: "ㄉ", pinyin: "d", example: "大 (dà)" },
                    { char: "ㄊ", pinyin: "t", example: "他 (tā)" },
                    { char: "ㄋ", pinyin: "n", example: "你 (nǐ)" },
                    { char: "ㄌ", pinyin: "l", example: "來 (lái)" },
                    { char: "ㄍ", pinyin: "g", example: "哥 (gē)" },
                    { char: "ㄎ", pinyin: "k", example: "看 (kàn)" },
                    { char: "ㄏ", pinyin: "h", example: "好 (hǎo)" },
                    { char: "ㄐ", pinyin: "j", example: "家 (jiā)" },
                    { char: "ㄑ", pinyin: "q", example: "七 (qī)" },
                    { char: "ㄒ", pinyin: "x", example: "西 (xī)" },
                    { char: "ㄓ", pinyin: "zh", example: "這 (zhè)" },
                    { char: "ㄔ", pinyin: "ch", example: "吃 (chī)" },
                    { char: "ㄕ", pinyin: "sh", example: "是 (shì)" },
                    { char: "ㄖ", pinyin: "r", example: "日 (rì)" },
                    { char: "ㄗ", pinyin: "z", example: "在 (zài)" },
                    { char: "ㄘ", pinyin: "c", example: "菜 (cài)" },
                    { char: "ㄙ", pinyin: "s", example: "三 (sān)" }
                ]
            },
            medials: {
                title: "Medial Vowels",
                description: "Medial vowels are the middle sounds that combine with initial consonants. There are 3 medial vowels.",
                characters: [
                    { char: "ㄧ", pinyin: "i/y", example: "一 (yī)" },
                    { char: "ㄨ", pinyin: "u/w", example: "五 (wǔ)" },
                    { char: "ㄩ", pinyin: "ü/yu", example: "魚 (yú)" }
                ]
            },
            finals: {
                title: "Final Sounds",
                description: "Final sounds complete the Zhuyin syllables. There are 13 final sounds.",
                characters: [
                    { char: "ㄚ", pinyin: "a", example: "阿 (ā)" },
                    { char: "ㄛ", pinyin: "o", example: "喔 (ō)" },
                    { char: "ㄜ", pinyin: "e", example: "餓 (è)" },
                    { char: "ㄝ", pinyin: "ê", example: "誒 (ê̄)" },
                    { char: "ㄞ", pinyin: "ai", example: "愛 (ài)" },
                    { char: "ㄟ", pinyin: "ei", example: "飛 (fēi)" },
                    { char: "ㄠ", pinyin: "ao", example: "好 (hǎo)" },
                    { char: "ㄡ", pinyin: "ou", example: "歐 (ōu)" },
                    { char: "ㄢ", pinyin: "an", example: "安 (ān)" },
                    { char: "ㄣ", pinyin: "en", example: "恩 (ēn)" },
                    { char: "ㄤ", pinyin: "ang", example: "昂 (áng)" },
                    { char: "ㄥ", pinyin: "eng", example: "冷 (lěng)" },
                    { char: "ㄦ", pinyin: "er", example: "兒 (ér)" }
                ]
            },
            tones: {
                title: "Tones",
                description: "Mandarin Chinese has 4 main tones and 1 neutral tone. These are marked with tone marks in Zhuyin.",
                characters: [
                    { char: "ˉ", pinyin: "1st tone", example: "高平調 (high level)" },
                    { char: "ˊ", pinyin: "2nd tone", example: "上升調 (rising)" },
                    { char: "ˇ", pinyin: "3rd tone", example: "降升調 (falling-rising)" },
                    { char: "ˋ", pinyin: "4th tone", example: "下降調 (falling)" },
                    { char: "˙", pinyin: "neutral", example: "輕聲 (light)" }
                ]
            },
            combined: {
                title: "Combined Sounds",
                description: "Practice combining initials, medials and finals to form complete syllables.",
                characters: [
                    { char: "ㄅㄚ", pinyin: "ba", example: "八 (bā)" },
                    { char: "ㄆㄠ", pinyin: "pao", example: "跑 (pǎo)" },
                    { char: "ㄇㄧ", pinyin: "mi", example: "米 (mǐ)" },
                    { char: "ㄈㄨ", pinyin: "fu", example: "服 (fú)" },
                    { char: "ㄉㄧㄠ", pinyin: "diao", example: "掉 (diào)" },
                    { char: "ㄊㄧㄢ", pinyin: "tian", example: "天 (tiān)" },
                    { char: "ㄋㄩ", pinyin: "nü", example: "女 (nǚ)" },
                    { char: "ㄌㄧㄤ", pinyin: "liang", example: "兩 (liǎng)" },
                    { char: "ㄍㄨㄛ", pinyin: "guo", example: "國 (guó)" },
                    { char: "ㄎㄨㄞ", pinyin: "kuai", example: "快 (kuài)" },
                    { char: "ㄏㄜ", pinyin: "he", example: "和 (hé)" },
                    { char: "ㄐㄧㄝ", pinyin: "jie", example: "姐 (jiě)" },
                    { char: "ㄑㄩㄥ", pinyin: "qiong", example: "窮 (qióng)" },
                    { char: "ㄒㄩㄝ", pinyin: "xue", example: "學 (xué)" },
                    { char: "ㄓㄨㄤ", pinyin: "zhuang", example: "裝 (zhuāng)" },
                    { char: "ㄔㄨㄣ", pinyin: "chun", example: "春 (chūn)" },
                    { char: "ㄕㄨㄟ", pinyin: "shui", example: "水 (shuǐ)" },
                    { char: "ㄖㄣ", pinyin: "ren", example: "人 (rén)" },
                    { char: "ㄗㄞ", pinyin: "zai", example: "在 (zài)" },
                    { char: "ㄘㄨㄣ", pinyin: "cun", example: "村 (cūn)" },
                    { char: "ㄙㄨㄥ", pinyin: "song", example: "送 (sòng)" }
                ]
            }
        };

        // Practice questions
        const practiceQuestions = [
            { char: "ㄅ", pinyin: "b", audio: "b" },
            { char: "ㄆ", pinyin: "p", audio: "p" },
            { char: "ㄇ", pinyin: "m", audio: "m" },
            { char: "ㄈ", pinyin: "f", audio: "f" },
            { char: "ㄉ", pinyin: "d", audio: "d" },
            { char: "ㄊ", pinyin: "t", audio: "t" },
            { char: "ㄋ", pinyin: "n", audio: "n" },
            { char: "ㄌ", pinyin: "l", audio: "l" },
            { char: "ㄍ", pinyin: "g", audio: "g" },
            { char: "ㄎ", pinyin: "k", audio: "k" },
            { char: "ㄏ", pinyin: "h", audio: "h" },
            { char: "ㄐ", pinyin: "j", audio: "j" },
            { char: "ㄑ", pinyin: "q", audio: "q" },
            { char: "ㄒ", pinyin: "x", audio: "x" },
            { char: "ㄓ", pinyin: "zh", audio: "zh" },
            { char: "ㄔ", pinyin: "ch", audio: "ch" },
            { char: "ㄕ", pinyin: "sh", audio: "sh" },
            { char: "ㄖ", pinyin: "r", audio: "r" },
            { char: "ㄗ", pinyin: "z", audio: "z" },
            { char: "ㄘ", pinyin: "c", audio: "c" },
            { char: "ㄙ", pinyin: "s", audio: "s" },
            { char: "ㄧ", pinyin: "i/y", audio: "i" },
            { char: "ㄨ", pinyin: "u/w", audio: "u" },
            { char: "ㄩ", pinyin: "ü/yu", audio: "ü" },
            { char: "ㄚ", pinyin: "a", audio: "a" },
            { char: "ㄛ", pinyin: "o", audio: "o" },
            { char: "ㄜ", pinyin: "e", audio: "e" },
            { char: "ㄝ", pinyin: "ê", audio: "ê" },
            { char: "ㄞ", pinyin: "ai", audio: "ai" },
            { char: "ㄟ", pinyin: "ei", audio: "ei" },
            { char: "ㄠ", pinyin: "ao", audio: "ao" },
            { char: "ㄡ", pinyin: "ou", audio: "ou" },
            { char: "ㄢ", pinyin: "an", audio: "an" },
            { char: "ㄣ", pinyin: "en", audio: "en" },
            { char: "ㄤ", pinyin: "ang", audio: "ang" },
            { char: "ㄥ", pinyin: "eng", audio: "eng" },
            { char: "ㄦ", pinyin: "er", audio: "er" }
        ];

        // Tab switching functionality
        document.getElementById('lessons-tab').addEventListener('click', () => {
            switchTab('lessons');
        });

        document.getElementById('practice-tab').addEventListener('click', () => {
            switchTab('practice');
        });

        document.getElementById('progress-tab').addEventListener('click', () => {
            switchTab('progress');
        });

        function switchTab(tabName) {
            // Hide all tab contents
            document.getElementById('lessons-content').classList.add('hidden');
            document.getElementById('practice-content').classList.add('hidden');
            document.getElementById('progress-content').classList.add('hidden');
            
            // Remove active class from all tabs
            document.getElementById('lessons-tab').classList.remove('tab-active');
            document.getElementById('practice-tab').classList.remove('tab-active');
            document.getElementById('progress-tab').classList.remove('tab-active');
            
            // Show selected tab content and add active class
            document.getElementById(`${tabName}-content`).classList.remove('hidden');
            document.getElementById(`${tabName}-tab`).classList.add('tab-active');
        }

        // Lesson loading functionality
        function loadLesson(lessonType) {
            const lesson = zhuyinData[lessonType];
            
            // Hide lessons list and show lesson detail
            document.getElementById('lessons-content').querySelector('.grid').classList.add('hidden');
            document.getElementById('lesson-detail').classList.remove('hidden');
            
            // Set lesson title and description
            document.getElementById('lesson-title').textContent = lesson.title;
            document.getElementById('lesson-description').textContent = lesson.description;
            
            // Clear previous characters
            const charactersContainer = document.getElementById('lesson-characters');
            charactersContainer.innerHTML = '';
            
            // Add characters to the lesson
            lesson.characters.forEach(charData => {
                const charElement = document.createElement('div');
                charElement.className = 'character-card bg-white border border-gray-200 rounded-lg p-4 text-center cursor-pointer hover:shadow-md';
                charElement.innerHTML = `
                    <div class="zhuyin-char mb-2">${charData.char}</div>
                    <div class="text-gray-700 font-medium">${charData.pinyin}</div>
                    <div class="text-sm text-gray-500 mt-1">${charData.example}</div>
                `;
                charElement.addEventListener('click', () => {
                    // In a real app, this would play the sound
                    console.log(`Playing sound for ${charData.char}`);
                });
                charactersContainer.appendChild(charElement);
            });
        }

        function backToLessons() {
            // Show lessons list and hide lesson detail
            document.getElementById('lessons-content').querySelector('.grid').classList.remove('hidden');
            document.getElementById('lesson-detail').classList.add('hidden');
        }

        // Practice session functionality
        let currentQuestion = 0;
        let correctAnswers = 0;
        let questions = [];
        let currentCorrectAnswer = '';

        document.getElementById('start-practice').addEventListener('click', startPractice);

        function startPractice() {
            // Hide start button and show practice session
            document.getElementById('start-practice').classList.add('hidden');
            document.getElementById('practice-session').classList.remove('hidden');
            
            // Reset counters
            currentQuestion = 0;
            correctAnswers = 0;
            
            // Create a shuffled list of 10 questions
            questions = [...practiceQuestions].sort(() => 0.5 - Math.random()).slice(0, 10);
            
            // Load first question
            loadQuestion();
        }

        function loadQuestion() {
            // Update progress
            document.getElementById('progress-text').textContent = `Question ${currentQuestion + 1} of ${questions.length}`;
            document.getElementById('progress-bar').style.width = `${(currentQuestion / questions.length) * 100}%`;
            
            // Get current question
            const question = questions[currentQuestion];
            currentCorrectAnswer = question.char;
            
            // Clear previous options and feedback
            document.getElementById('answer-options').innerHTML = '';
            document.getElementById('feedback').classList.add('hidden');
            document.getElementById('correct-feedback').classList.add('hidden');
            document.getElementById('wrong-feedback').classList.add('hidden');
            
            // Create answer options (current question + 3 random others)
            const options = [question];
            const otherOptions = practiceQuestions.filter(q => q.char !== question.char);
            
            // Shuffle and pick 3 random options
            const shuffledOthers = [...otherOptions].sort(() => 0.5 - Math.random()).slice(0, 3);
            options.push(...shuffledOthers);
            
            // Shuffle the options again
            const shuffledOptions = options.sort(() => 0.5 - Math.random());
            
            // Create option buttons
            shuffledOptions.forEach(option => {
                const optionButton = document.createElement('button');
                optionButton.className = 'bg-white border border-gray-200 rounded-lg p-4 text-center hover:bg-gray-50 focus:outline-none';
                optionButton.innerHTML = `
                    <div class="zhuyin-char">${option.char}</div>
                    <div class="text-sm text-gray-500">${option.pinyin}</div>
                `;
                optionButton.addEventListener('click', () => checkAnswer(option.char));
                document.getElementById('answer-options').appendChild(optionButton);
            });
            
            // Set up play sound button
            document.getElementById('play-sound').addEventListener('click', () => {
                // In a real app, this would play the sound for the current question
                console.log(`Playing sound for ${question.char}`);
            });
        }

        function checkAnswer(selectedChar) {
            // Disable all answer options
            const options = document.getElementById('answer-options').querySelectorAll('button');
            options.forEach(option => {
                option.disabled = true;
                if (option.textContent.includes(currentCorrectAnswer)) {
                    option.classList.add('bg-green-100', 'border-green-300');
                }
                
                if (option.textContent.includes(selectedChar) && selectedChar !== currentCorrectAnswer) {
                    option.classList.add('bg-red-100', 'border-red-300');
                }
            });
            
            // Show feedback
            document.getElementById('feedback').classList.remove('hidden');
            
            if (selectedChar === currentCorrectAnswer) {
                correctAnswers++;
                document.getElementById('correct-feedback').classList.remove('hidden');
            } else {
                document.getElementById('correct-answer-text').textContent = `The correct answer was: ${currentCorrectAnswer}`;
                document.getElementById('wrong-feedback').classList.remove('hidden');
            }
        }

        document.getElementById('next-question').addEventListener('click', () => {
            currentQuestion++;
            
            if (currentQuestion < questions.length) {
                loadQuestion();
            } else {
                // Practice session complete, show results
                showResults();
            }
        });

        function showResults() {
            document.getElementById('practice-session').classList.add('hidden');
            document.getElementById('practice-results').classList.remove('hidden');
            
            document.getElementById('results-score').textContent = `You scored ${correctAnswers} out of ${questions.length}`;
            document.getElementById('correct-count').textContent = correctAnswers;
            document.getElementById('incorrect-count').textContent = questions.length - correctAnswers;
            
            // Update progress bars
            document.querySelector('#practice-results .progress-fill').style.width = `${(correctAnswers / questions.length) * 100}%`;
            document.querySelector('#practice-results .bg-red-50 .progress-fill').style.width = `${((questions.length - correctAnswers) / questions.length) * 100}%`;
        }

        function restartPractice() {
            document.getElementById('practice-results').classList.add('hidden');
            startPractice();
        }

        // Initialize the app with lessons tab
        switchTab('lessons');
    </script>
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