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                        বাংলাদেশের ইতিহাস ও বিশ্বসভ্যতা ch 12
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                        Test your knowledge with this comprehensive quiz covering key concepts and challenging questions.
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                        বাংলাদেশের ইতিহাস ও বিশ্বসভ্যতা ch 9
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                        বাংলাদেশের ইতিহাস ও বিশ্বসভ্যতা ch 11
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                        বাংলাদেশের ইতিহাস ও বিশ্বসভ্যতা ch 10
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                        বাংলাদেশের ইতিহাস ও বিশ্বসভ্যতা ch 8
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                        বাংলাদেশের ইতিহাস ও বিশ্বসভ্যতা ch 4
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                        বাংলাদেশের ইতিহাস ও বিশ্বসভ্যতা ch 7
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                        বাংলাদেশের ইতিহাস ও বিশ্বসভ্যতা ch 6
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                    </h3>
                    
                    <!-- Description -->
                    <p class="text-gray-300 text-sm mb-4 line-clamp-2 leading-relaxed">
                        Test your knowledge with this comprehensive quiz covering key concepts and challenging questions.
                    </p>
                    
                    <!-- Stats Grid -->
                    <div class="grid grid-cols-3 gap-3 mb-4">
                        
                        <div class="text-center p-2 rounded-lg bg-white/5 backdrop-blur-sm">
                            <div class="text-xs text-sky-300 mb-1">Plays</div>
                            <div class="text-lg font-bold text-white">6</div>
                        </div>
                        
                        <div class="text-center p-2 rounded-lg bg-white/5 backdrop-blur-sm">
                            <div class="text-xs text-sky-300 mb-1">Avg Score</div>
                            <div class="text-lg font-bold text-white">0%</div>
                        </div>
                        <div class="text-center p-2 rounded-lg bg-white/5 backdrop-blur-sm">
                            <div class="text-xs text-sky-300 mb-1">Questions</div>
                            <div class="text-lg font-bold text-white">10</div>
                        </div>
                    </div>
                    
                    <!-- Start Button -->
                    <button class="w-full py-3 bg-gradient-to-r from-[#23aee2] to-[#1890bf] hover:from-[#1890bf] hover:to-[#23aee2] text-white font-bold rounded-lg shadow-lg group-hover:shadow-xl transform group-hover:scale-105 transition-all duration-300 flex items-center justify-center gap-2">
                        <span>▶️</span>
                        <span>Start Quiz</span>
                    </button>
                </div>
            </div>
            
            <div class="quiz-card glass-card rounded-2xl overflow-hidden shadow-xl hover:shadow-2xl cursor-pointer group"
                 onclick="window.location.href='/dashboard/quiz/play/2174/'">
                
                <!-- Thumbnail with Gradient Overlay -->
                <div class="relative h-56 overflow-hidden">
                    
                    <div class="w-full h-full bg-gradient-to-br from-[#23aee2] via-[#1890bf] to-[#0f6690] flex items-center justify-center">
                        <span class="text-white text-7xl opacity-80">
                            📚
                        </span>
                    </div>
                    
                    
                    <!-- Difficulty Badge -->
                    
                    <div class="absolute top-4 right-4">
                        <span class="badge-glow px-4 py-2 rounded-full text-xs font-bold text-white backdrop-blur-md
                                   bg-yellow-500/80
                                   ">
                            🟡 MEDIUM
                            
                        </span>
                    </div>
                    
                    
                    <!-- Gradient Overlay -->
                    <div class="absolute inset-0 bg-gradient-to-t from-black/60 via-transparent to-transparent"></div>
                </div>
                
                <!-- Card Content -->
                <div class="p-6 bg-gradient-to-b from-transparent to-black/20">
                    
                    <!-- Category Tag -->
                    
                    <div class="mb-3">
                        <span class="inline-block px-3 py-1 bg-sky-500/30 backdrop-blur-sm text-sky-200 rounded-full text-xs font-semibold border border-sky-400/30">
                            নবম ও দশম শ্রেণী
                        </span>
                    </div>
                    
                    
                    <!-- Title -->
                    <h3 class="text-xl font-bold text-white mb-3 line-clamp-2 group-hover:text-sky-300 transition-colors">
                        বাংলাদেশের ইতিহাস ও বিশ্বসভ্যতা ch 5
                    </h3>
                    
                    <!-- Description -->
                    <p class="text-gray-300 text-sm mb-4 line-clamp-2 leading-relaxed">
                        Test your knowledge with this comprehensive quiz covering key concepts and challenging questions.
                    </p>
                    
                    <!-- Stats Grid -->
                    <div class="grid grid-cols-3 gap-3 mb-4">
                        
                        <div class="text-center p-2 rounded-lg bg-white/5 backdrop-blur-sm">
                            <div class="text-xs text-sky-300 mb-1">Plays</div>
                            <div class="text-lg font-bold text-white">6</div>
                        </div>
                        
                        <div class="text-center p-2 rounded-lg bg-white/5 backdrop-blur-sm">
                            <div class="text-xs text-sky-300 mb-1">Avg Score</div>
                            <div class="text-lg font-bold text-white">0%</div>
                        </div>
                        <div class="text-center p-2 rounded-lg bg-white/5 backdrop-blur-sm">
                            <div class="text-xs text-sky-300 mb-1">Questions</div>
                            <div class="text-lg font-bold text-white">10</div>
                        </div>
                    </div>
                    
                    <!-- Start Button -->
                    <button class="w-full py-3 bg-gradient-to-r from-[#23aee2] to-[#1890bf] hover:from-[#1890bf] hover:to-[#23aee2] text-white font-bold rounded-lg shadow-lg group-hover:shadow-xl transform group-hover:scale-105 transition-all duration-300 flex items-center justify-center gap-2">
                        <span>▶️</span>
                        <span>Start Quiz</span>
                    </button>
                </div>
            </div>
            
            <div class="quiz-card glass-card rounded-2xl overflow-hidden shadow-xl hover:shadow-2xl cursor-pointer group"
                 onclick="window.location.href='/dashboard/quiz/play/2172/'">
                
                <!-- Thumbnail with Gradient Overlay -->
                <div class="relative h-56 overflow-hidden">
                    
                    <div class="w-full h-full bg-gradient-to-br from-[#23aee2] via-[#1890bf] to-[#0f6690] flex items-center justify-center">
                        <span class="text-white text-7xl opacity-80">
                            📚
                        </span>
                    </div>
                    
                    
                    <!-- Difficulty Badge -->
                    
                    <div class="absolute top-4 right-4">
                        <span class="badge-glow px-4 py-2 rounded-full text-xs font-bold text-white backdrop-blur-md
                                   bg-yellow-500/80
                                   ">
                            🟡 MEDIUM
                            
                        </span>
                    </div>
                    
                    
                    <!-- Gradient Overlay -->
                    <div class="absolute inset-0 bg-gradient-to-t from-black/60 via-transparent to-transparent"></div>
                </div>
                
                <!-- Card Content -->
                <div class="p-6 bg-gradient-to-b from-transparent to-black/20">
                    
                    <!-- Category Tag -->
                    
                    <div class="mb-3">
                        <span class="inline-block px-3 py-1 bg-sky-500/30 backdrop-blur-sm text-sky-200 rounded-full text-xs font-semibold border border-sky-400/30">
                            নবম ও দশম শ্রেণী
                        </span>
                    </div>
                    
                    
                    <!-- Title -->
                    <h3 class="text-xl font-bold text-white mb-3 line-clamp-2 group-hover:text-sky-300 transition-colors">
                        বাংলাদেশের ইতিহাস ও বিশ্বসভ্যতা ch 1
                    </h3>
                    
                    <!-- Description -->
                    <p class="text-gray-300 text-sm mb-4 line-clamp-2 leading-relaxed">
                        Test your knowledge with this comprehensive quiz covering key concepts and challenging questions.
                    </p>
                    
                    <!-- Stats Grid -->
                    <div class="grid grid-cols-3 gap-3 mb-4">
                        
                        <div class="text-center p-2 rounded-lg bg-white/5 backdrop-blur-sm">
                            <div class="text-xs text-sky-300 mb-1">Plays</div>
                            <div class="text-lg font-bold text-white">11</div>
                        </div>
                        
                        <div class="text-center p-2 rounded-lg bg-white/5 backdrop-blur-sm">
                            <div class="text-xs text-sky-300 mb-1">Avg Score</div>
                            <div class="text-lg font-bold text-white">0%</div>
                        </div>
                        <div class="text-center p-2 rounded-lg bg-white/5 backdrop-blur-sm">
                            <div class="text-xs text-sky-300 mb-1">Questions</div>
                            <div class="text-lg font-bold text-white">10</div>
                        </div>
                    </div>
                    
                    <!-- Start Button -->
                    <button class="w-full py-3 bg-gradient-to-r from-[#23aee2] to-[#1890bf] hover:from-[#1890bf] hover:to-[#23aee2] text-white font-bold rounded-lg shadow-lg group-hover:shadow-xl transform group-hover:scale-105 transition-all duration-300 flex items-center justify-center gap-2">
                        <span>▶️</span>
                        <span>Start Quiz</span>
                    </button>
                </div>
            </div>
            
            <div class="quiz-card glass-card rounded-2xl overflow-hidden shadow-xl hover:shadow-2xl cursor-pointer group"
                 onclick="window.location.href='/dashboard/quiz/play/2171/'">
                
                <!-- Thumbnail with Gradient Overlay -->
                <div class="relative h-56 overflow-hidden">
                    
                    <div class="w-full h-full bg-gradient-to-br from-[#23aee2] via-[#1890bf] to-[#0f6690] flex items-center justify-center">
                        <span class="text-white text-7xl opacity-80">
                            📚
                        </span>
                    </div>
                    
                    
                    <!-- Difficulty Badge -->
                    
                    <div class="absolute top-4 right-4">
                        <span class="badge-glow px-4 py-2 rounded-full text-xs font-bold text-white backdrop-blur-md
                                   bg-yellow-500/80
                                   ">
                            🟡 MEDIUM
                            
                        </span>
                    </div>
                    
                    
                    <!-- Gradient Overlay -->
                    <div class="absolute inset-0 bg-gradient-to-t from-black/60 via-transparent to-transparent"></div>
                </div>
                
                <!-- Card Content -->
                <div class="p-6 bg-gradient-to-b from-transparent to-black/20">
                    
                    <!-- Category Tag -->
                    
                    <div class="mb-3">
                        <span class="inline-block px-3 py-1 bg-sky-500/30 backdrop-blur-sm text-sky-200 rounded-full text-xs font-semibold border border-sky-400/30">
                            নবম ও দশম শ্রেণী
                        </span>
                    </div>
                    
                    
                    <!-- Title -->
                    <h3 class="text-xl font-bold text-white mb-3 line-clamp-2 group-hover:text-sky-300 transition-colors">
                        physics ch 12
                    </h3>
                    
                    <!-- Description -->
                    <p class="text-gray-300 text-sm mb-4 line-clamp-2 leading-relaxed">
                        Test your knowledge with this comprehensive quiz covering key concepts and challenging questions.
                    </p>
                    
                    <!-- Stats Grid -->
                    <div class="grid grid-cols-3 gap-3 mb-4">
                        
                        <div class="text-center p-2 rounded-lg bg-white/5 backdrop-blur-sm">
                            <div class="text-xs text-sky-300 mb-1">Plays</div>
                            <div class="text-lg font-bold text-white">7</div>
                        </div>
                        
                        <div class="text-center p-2 rounded-lg bg-white/5 backdrop-blur-sm">
                            <div class="text-xs text-sky-300 mb-1">Avg Score</div>
                            <div class="text-lg font-bold text-white">0%</div>
                        </div>
                        <div class="text-center p-2 rounded-lg bg-white/5 backdrop-blur-sm">
                            <div class="text-xs text-sky-300 mb-1">Questions</div>
                            <div class="text-lg font-bold text-white">10</div>
                        </div>
                    </div>
                    
                    <!-- Start Button -->
                    <button class="w-full py-3 bg-gradient-to-r from-[#23aee2] to-[#1890bf] hover:from-[#1890bf] hover:to-[#23aee2] text-white font-bold rounded-lg shadow-lg group-hover:shadow-xl transform group-hover:scale-105 transition-all duration-300 flex items-center justify-center gap-2">
                        <span>▶️</span>
                        <span>Start Quiz</span>
                    </button>
                </div>
            </div>
            
        </div>
        
        <!-- Pagination -->
        
        <div class="mt-16 flex justify-center gap-2">
            
            <a href="?page=1" 
               class="px-4 py-2 glass-card text-white rounded-lg hover:bg-white/20 transition-all">First</a>
            <a href="?page=53" 
               class="px-4 py-2 glass-card text-white rounded-lg hover:bg-white/20 transition-all">← Previous</a>
            
            
            <span class="px-6 py-2 bg-gradient-to-r from-[#23aee2] to-[#1890bf] text-white rounded-lg font-bold shadow-lg">
                Page 54 of 198
            </span>
            
            
            <a href="?page=55" 
               class="px-4 py-2 glass-card text-white rounded-lg hover:bg-white/20 transition-all">Next →</a>
            <a href="?page=198" 
               class="px-4 py-2 glass-card text-white rounded-lg hover:bg-white/20 transition-all">Last</a>
            
        </div>
        
        
    </div>
</div>

<style>
    @keyframes blob {
        0%, 100% { transform: translate(0px, 0px) scale(1); }
        33% { transform: translate(30px, -50px) scale(1.1); }
        66% { transform: translate(-20px, 20px) scale(0.9); }
    }
    
    .animate-blob {
        animation: blob 7s infinite;
    }
    
    .animation-delay-2000 {
        animation-delay: 2s;
    }
    
    .animation-delay-4000 {
        animation-delay: 4s;
    }
</style>

<script>
document.addEventListener('DOMContentLoaded', function() {
    const categorySelect = document.getElementById('category-select');
    const courseSelect = document.getElementById('course-select');
    const chapterSelect = document.getElementById('chapter-select');
    const difficultySelect = document.getElementById('difficulty-select');
    const searchInput = document.getElementById('search-input');
    const gridContainer = document.getElementById('quiz-grid-container');
    const loader = document.getElementById('loading-indicator');

    // --- 1. Cascading Dropdown Logic ---

    // When Category Changes
    categorySelect.addEventListener('change', function() {
        const catId = this.value;
        
        // Reset Child Dropdowns
        resetSelect(courseSelect, 'Select Category First');
        resetSelect(chapterSelect, 'Select Course First');

        if (catId) {
            // Fetch courses for this category
            fetchOptions('course', catId, courseSelect, 'All Courses');
        }
        
        fetchQuizzes();
    });

    // When Course Changes
    courseSelect.addEventListener('change', function() {
        const courseId = this.value;
        
        // Reset Chapter
        resetSelect(chapterSelect, 'Select Course First');

        if (courseId) {
            // Fetch chapters for this course
            fetchOptions('chapter', courseId, chapterSelect, 'All Chapters');
        }

        fetchQuizzes();
    });

    // Other Filters
    chapterSelect.addEventListener('change', fetchQuizzes);
    difficultySelect.addEventListener('change', fetchQuizzes);
    
    let timeout = null;
    searchInput.addEventListener('keyup', function() {
        clearTimeout(timeout);
        timeout = setTimeout(fetchQuizzes, 500);
    });

    // --- Helper Functions ---

    function resetSelect(element, placeholder) {
        element.innerHTML = `<option value="">${placeholder}</option>`;
        element.disabled = true;
        element.classList.add('opacity-50', 'cursor-not-allowed');
    }

    function fetchOptions(type, parentId, targetElement, defaultText) {
        // Build URL
        const url = `/dashboard/api/filter-options/?type=${type}&parent_id=${parentId}`;
        
        fetch(url)
        .then(response => response.json())
        .then(data => {
            // Enable the select box
            targetElement.disabled = false;
            targetElement.classList.remove('opacity-50', 'cursor-not-allowed');
            
            // Clear and add Default Option
            targetElement.innerHTML = `<option value="">${defaultText}</option>`;
            
            // Append new options
            data.options.forEach(item => {
                const option = document.createElement('option');
                option.value = item.id; // This uses the ID (number)
                option.textContent = item.title;
                targetElement.appendChild(option);
            });
        })
        .catch(error => console.error('Error loading options:', error));
    }

    function fetchQuizzes() {
        loader.classList.remove('hidden');
        gridContainer.style.opacity = '0.5';

        const params = new URLSearchParams();
        if(categorySelect.value) params.append('category', categorySelect.value);
        if(courseSelect.value) params.append('course', courseSelect.value);
        if(chapterSelect.value) params.append('chapter', chapterSelect.value);
        if(difficultySelect.value) params.append('difficulty', difficultySelect.value);
        if(searchInput.value) params.append('search', searchInput.value);

        const url = `${window.location.pathname}?${params.toString()}`;

        fetch(url, {
            headers: { 'X-Requested-With': 'XMLHttpRequest' }
        })
        .then(response => response.json())
        .then(data => {
            gridContainer.innerHTML = data.html;
            document.getElementById('total-quizzes-badge').textContent = data.total;
            gridContainer.style.opacity = '1';
            loader.classList.add('hidden');
            window.history.pushState({}, '', url);
        })
        .catch(error => {
            console.error('Error:', error);
            gridContainer.style.opacity = '1';
            loader.classList.add('hidden');
        });
    }
});
</script>
<!-- ════════════════════════════════════════════════════════════════
     AGE STUDY TOOLBAR — phase A (localStorage only, no backend)
     Floating bottom-right FAB. Marks pages as favorite / liked / 
     needs-revision / mistake. Shows reminders based on spaced repetition.
     ════════════════════════════════════════════════════════════════ -->
<style>
  .age-study-fab{position:fixed;right:20px;bottom:90px;width:56px;height:56px;
    border-radius:50%;background:linear-gradient(135deg,#10b981,#059669);
    box-shadow:0 6px 24px rgba(16,185,129,.4);border:none;cursor:pointer;
    display:flex;align-items:center;justify-content:center;font-size:24px;
    z-index:9999;transition:transform .2s;color:#fff}
  .age-study-fab:hover{transform:scale(1.08)}
  .age-study-fab .age-study-badge{position:absolute;top:-4px;right:-4px;
    background:#ef4444;color:#fff;font-size:11px;font-weight:700;
    border-radius:10px;padding:2px 6px;min-width:18px;text-align:center;
    border:2px solid #fff;display:none}
  .age-study-fab.has-reminders .age-study-badge{display:block}
  .age-study-panel{position:fixed;right:20px;bottom:160px;width:340px;
    max-height:520px;background:#0f172a;color:#e2e8f0;border-radius:16px;
    box-shadow:0 12px 40px rgba(0,0,0,.6);border:1px solid rgba(16,185,129,.3);
    z-index:9998;display:none;flex-direction:column;overflow:hidden;
    font-family:'Hind Siliguri',-apple-system,sans-serif}
  .age-study-panel.open{display:flex}
  .age-study-header{padding:14px 16px;background:rgba(16,185,129,.12);
    border-bottom:1px solid rgba(16,185,129,.25);display:flex;
    justify-content:space-between;align-items:center}
  .age-study-header h3{margin:0;font-size:15px;font-weight:700;color:#6ee7b7}
  .age-study-close{background:transparent;border:0;color:#94a3b8;cursor:pointer;
    font-size:20px;line-height:1;padding:0 4px}
  .age-study-tabs{display:flex;background:rgba(15,23,42,.8);
    border-bottom:1px solid rgba(148,163,184,.15)}
  .age-study-tab{flex:1;padding:10px 4px;background:transparent;border:0;
    color:#94a3b8;cursor:pointer;font-size:12px;font-weight:600;
    border-bottom:2px solid transparent}
  .age-study-tab.active{color:#6ee7b7;border-bottom-color:#10b981;
    background:rgba(16,185,129,.06)}
  .age-study-tab .count{display:inline-block;margin-left:4px;background:rgba(16,185,129,.2);
    color:#6ee7b7;border-radius:8px;padding:1px 6px;font-size:10px;font-weight:700}
  .age-study-list{flex:1;overflow-y:auto;padding:8px;min-height:120px}
  .age-study-item{padding:10px 12px;background:rgba(30,41,59,.6);
    border-radius:8px;margin-bottom:6px;border-left:3px solid #10b981;
    cursor:pointer;transition:background .15s}
  .age-study-item:hover{background:rgba(30,41,59,.9)}
  .age-study-item.due{border-left-color:#ef4444;background:rgba(239,68,68,.08)}
  .age-study-item-title{font-size:13px;font-weight:600;color:#f1f5f9;
    overflow:hidden;text-overflow:ellipsis;white-space:nowrap;margin-bottom:2px}
  .age-study-item-meta{font-size:11px;color:#94a3b8}
  .age-study-empty{text-align:center;color:#64748b;padding:30px 16px;font-size:13px}
  .age-study-actions{padding:12px 16px;background:rgba(15,23,42,.8);
    border-top:1px solid rgba(148,163,184,.15)}
  .age-study-actions-label{font-size:11px;color:#94a3b8;text-transform:uppercase;
    letter-spacing:.5px;font-weight:600;margin-bottom:8px}
  .age-study-action-btns{display:grid;grid-template-columns:repeat(4,1fr);gap:6px}
  .age-study-action-btn{padding:8px 4px;background:rgba(30,41,59,.6);
    border:1px solid rgba(148,163,184,.2);border-radius:8px;cursor:pointer;
    color:#cbd5e1;font-size:18px;transition:all .15s}
  .age-study-action-btn:hover{background:rgba(16,185,129,.15);
    border-color:rgba(16,185,129,.4);transform:translateY(-1px)}
  .age-study-action-btn.active{background:rgba(16,185,129,.25);
    border-color:#10b981;color:#6ee7b7}
  .age-study-action-btn span{display:block;font-size:9px;font-weight:700;
    margin-top:2px;color:#94a3b8}
  .age-study-action-btn.active span{color:#6ee7b7}
  .age-study-toast{position:fixed;bottom:170px;right:20px;background:#0f172a;
    color:#6ee7b7;padding:10px 16px;border-radius:10px;border:1px solid rgba(16,185,129,.4);
    font-size:13px;font-weight:600;z-index:10000;opacity:0;transform:translateY(8px);
    transition:opacity .2s,transform .2s;pointer-events:none}
  .age-study-toast.show{opacity:1;transform:translateY(0)}
  @media(max-width:480px){
    .age-study-fab{right:14px;bottom:86px;width:50px;height:50px;font-size:21px}
    .age-study-panel{right:14px;left:14px;width:auto;bottom:148px}
  }
</style>

<button class="age-study-fab" id="ageStudyFab" type="button" 
        aria-label="Study Tools" title="Study Tools">
  📚
  <span class="age-study-badge" id="ageStudyBadge">0</span>
</button>

<div class="age-study-panel" id="ageStudyPanel" role="dialog" aria-label="Study Tools">
  <div class="age-study-header">
    <h3>📚 Study Tools</h3>
    <button class="age-study-close" id="ageStudyClose" type="button" aria-label="Close">×</button>
  </div>
  <div class="age-study-tabs">
    <button class="age-study-tab active" data-age-tab="favorites" type="button">⭐ <span class="count" data-count="favorites">0</span></button>
    <button class="age-study-tab" data-age-tab="revisions" type="button">🔄 <span class="count" data-count="revisions">0</span></button>
    <button class="age-study-tab" data-age-tab="mistakes" type="button">❌ <span class="count" data-count="mistakes">0</span></button>
    <button class="age-study-tab" data-age-tab="history" type="button">📜</button>
  </div>
  <div class="age-study-list" id="ageStudyList">
    <div class="age-study-empty">No items yet. Tap a button below to mark this page.</div>
  </div>
  <div class="age-study-actions">
    <div class="age-study-actions-label">Mark this page</div>
    <div class="age-study-action-btns">
      <button class="age-study-action-btn" data-age-mark="favorite" type="button" title="Save as favorite">⭐<span>FAV</span></button>
      <button class="age-study-action-btn" data-age-mark="like" type="button" title="Mark as helpful">👍<span>HELPFUL</span></button>
      <button class="age-study-action-btn" data-age-mark="revision" type="button" title="Need to revise">🔄<span>REVISE</span></button>
      <button class="age-study-action-btn" data-age-mark="mistake" type="button" title="Got wrong / struggled">❌<span>MISS</span></button>
    </div>
  </div>
</div>

<div class="age-study-toast" id="ageStudyToast"></div>

<script>
(function(){
  'use strict';
  var STORAGE_KEY = 'age_study_v1';
  var HISTORY_LIMIT = 50;
  // Spaced repetition intervals in ms
  var REMIND_INTERVALS = {
    revision: [86400000, 259200000, 604800000],   // 1d, 3d, 7d
    mistake:  [86400000, 172800000, 345600000]    // 1d, 2d, 4d
  };

  // ── Storage helpers ────────────────────────────────────────────
  function loadStore(){
    try {
      var raw = localStorage.getItem(STORAGE_KEY);
      if(!raw) return {marks:{}, history:[]};
      var s = JSON.parse(raw);
      if(!s.marks) s.marks = {};
      if(!s.history) s.history = [];
      return s;
    } catch(e){ return {marks:{}, history:[]}; }
  }
  function saveStore(s){
    try { localStorage.setItem(STORAGE_KEY, JSON.stringify(s)); }
    catch(e){ console.warn('age-study: storage write failed', e); }
  }

  // ── Page identity ──────────────────────────────────────────────
  function currentUrl(){ return location.pathname; }
  function currentTitle(){
    // Prefer <title>, fall back to first <h1>
    var t = document.title || '';
    if(t) {
      // Strip the site suffix
      t = t.replace(/\s*[-—|]\s*(AlphaGenEdu|Alpha Generation Education).*$/i, '');
      return t.trim() || location.pathname;
    }
    var h = document.querySelector('h1, h2');
    return h ? h.textContent.trim() : location.pathname;
  }

  // ── Mark / unmark ──────────────────────────────────────────────
  function setMark(state){
    var s = loadStore();
    var url = currentUrl();
    var existing = s.marks[url];
    if(existing && existing.state === state){
      // Toggle off
      delete s.marks[url];
      toast('Removed mark');
    } else {
      s.marks[url] = {
        state: state,
        title: currentTitle(),
        at: Date.now(),
        reminderStep: 0
      };
      toast(stateLabel(state) + ' saved');
    }
    saveStore(s);
    refreshUI();
  }
  function stateLabel(s){
    return ({favorite:'⭐ Favorite', like:'👍 Marked helpful',
             revision:'🔄 For revision', mistake:'❌ Mistake'})[s] || s;
  }

  // ── History tracking ───────────────────────────────────────────
  function recordVisit(){
    var s = loadStore();
    var url = currentUrl();
    // Skip non-content URLs
    if(url === '/' || url.indexOf('/static/') === 0 || url.indexOf('/api/') === 0) return;
    s.history = s.history.filter(function(h){ return h.url !== url; });
    s.history.unshift({url: url, title: currentTitle(), at: Date.now()});
    if(s.history.length > HISTORY_LIMIT) s.history = s.history.slice(0, HISTORY_LIMIT);
    saveStore(s);
  }

  // ── Reminders ──────────────────────────────────────────────────
  function isReminderDue(mark){
    if(mark.state !== 'revision' && mark.state !== 'mistake') return false;
    var intervals = REMIND_INTERVALS[mark.state];
    var step = mark.reminderStep || 0;
    if(step >= intervals.length) return false;
    return (Date.now() - mark.at) >= intervals[step];
  }
  function dueCount(){
    var s = loadStore();
    var n = 0;
    Object.values(s.marks).forEach(function(m){ if(isReminderDue(m)) n++; });
    return n;
  }

  // ── UI ─────────────────────────────────────────────────────────
  var fab = document.getElementById('ageStudyFab');
  var panel = document.getElementById('ageStudyPanel');
  var closeBtn = document.getElementById('ageStudyClose');
  var listEl = document.getElementById('ageStudyList');
  var toastEl = document.getElementById('ageStudyToast');
  var badgeEl = document.getElementById('ageStudyBadge');
  var activeTab = 'favorites';

  fab.addEventListener('click', function(){
    panel.classList.toggle('open');
    if(panel.classList.contains('open')) refreshUI();
  });
  closeBtn.addEventListener('click', function(){ panel.classList.remove('open'); });
  document.addEventListener('keydown', function(e){
    if(e.key === 'Escape') panel.classList.remove('open');
  });

  // Tabs
  document.querySelectorAll('[data-age-tab]').forEach(function(btn){
    btn.addEventListener('click', function(){
      activeTab = btn.dataset.ageTab;
      document.querySelectorAll('.age-study-tab').forEach(function(b){
        b.classList.toggle('active', b.dataset.ageTab === activeTab);
      });
      renderList();
    });
  });

  // Action buttons
  document.querySelectorAll('[data-age-mark]').forEach(function(btn){
    btn.addEventListener('click', function(){ setMark(btn.dataset.ageMark); });
  });

  function renderList(){
    var s = loadStore();
    var items = [];
    if(activeTab === 'history'){
      items = s.history.map(function(h){
        return {url: h.url, title: h.title, at: h.at, state: 'history', due: false};
      });
    } else {
      var stateMap = {favorites:'favorite', revisions:'revision', mistakes:'mistake'};
      var target = stateMap[activeTab];
      Object.entries(s.marks).forEach(function(kv){
        var url = kv[0], m = kv[1];
        // Include 'like' on favorites tab
        var matches = m.state === target || (activeTab === 'favorites' && m.state === 'like');
        if(matches){
          items.push({url:url, title:m.title, at:m.at, state:m.state, due:isReminderDue(m)});
        }
      });
      items.sort(function(a,b){
        if(a.due !== b.due) return a.due ? -1 : 1;
        return b.at - a.at;
      });
    }
    if(items.length === 0){
      listEl.innerHTML = '<div class="age-study-empty">No items yet.</div>';
      return;
    }
    listEl.innerHTML = items.map(function(it){
      var ago = humanTime(Date.now() - it.at);
      var dueClass = it.due ? ' due' : '';
      var dueLabel = it.due ? ' • DUE' : '';
      var safeTitle = (it.title||it.url).replace(/[<>&]/g, function(c){
        return ({'<':'&lt;','>':'&gt;','&':'&amp;'})[c];
      });
      return '<div class="age-study-item'+dueClass+'" data-url="'+it.url+'">'+
        '<div class="age-study-item-title">'+safeTitle+'</div>'+
        '<div class="age-study-item-meta">'+ago+' ago'+dueLabel+'</div>'+
        '</div>';
    }).join('');
    listEl.querySelectorAll('.age-study-item').forEach(function(el){
      el.addEventListener('click', function(){
        var url = el.dataset.url;
        if(url === location.pathname) panel.classList.remove('open');
        else location.href = url;
      });
    });
  }

  function refreshUI(){
    // Counts
    var s = loadStore();
    var counts = {favorites:0, revisions:0, mistakes:0};
    Object.values(s.marks).forEach(function(m){
      if(m.state === 'favorite' || m.state === 'like') counts.favorites++;
      if(m.state === 'revision') counts.revisions++;
      if(m.state === 'mistake') counts.mistakes++;
    });
    document.querySelectorAll('[data-count]').forEach(function(el){
      el.textContent = counts[el.dataset.count] || 0;
    });
    // Active button on action panel
    var current = s.marks[currentUrl()];
    document.querySelectorAll('[data-age-mark]').forEach(function(btn){
      btn.classList.toggle('active', !!(current && current.state === btn.dataset.ageMark));
    });
    // Reminder badge
    var due = dueCount();
    badgeEl.textContent = due;
    fab.classList.toggle('has-reminders', due > 0);
    if(panel.classList.contains('open')) renderList();
  }

  function humanTime(ms){
    var s = Math.floor(ms/1000);
    if(s < 60) return s+'s';
    var m = Math.floor(s/60); if(m < 60) return m+'m';
    var h = Math.floor(m/60); if(h < 24) return h+'h';
    var d = Math.floor(h/24); if(d < 30) return d+'d';
    var mo = Math.floor(d/30); if(mo < 12) return mo+'mo';
    return Math.floor(mo/12)+'y';
  }

  function toast(msg){
    toastEl.textContent = msg;
    toastEl.classList.add('show');
    setTimeout(function(){ toastEl.classList.remove('show'); }, 1800);
  }

  // ── Init ───────────────────────────────────────────────────────
  recordVisit();
  refreshUI();

  // Show reminder hint if items are due
  if(dueCount() > 0){
    setTimeout(function(){
      toast('🔔 ' + dueCount() + ' item(s) due for review');
    }, 1500);
  }
})();
</script>
<!-- ════════════════════════════════════════════════════════════════ -->
<!--
  Upgrade Modal — globally injected by UpgradeModalMiddleware.

  Listens for HTTP 402 responses from the SubscriptionGateMiddleware
  and shows a friendly Bengali message instead of letting the page
  fail silently or redirect away.

  Self-contained: scoped CSS (.um-* prefix), no external libs.
-->
<style>
  .um-overlay {
    position: fixed;
    inset: 0;
    background: rgba(7, 11, 18, 0.78);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 999999;
    padding: 20px;
    animation: um-fade 0.2s ease-out;
  }
  .um-overlay.um-active { display: flex; }
  @keyframes um-fade {
    from { opacity: 0; }
    to   { opacity: 1; }
  }

  .um-modal {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    border: 1px solid rgba(16, 185, 129, 0.35);
    border-radius: 22px;
    padding: 36px 32px 28px;
    max-width: 480px;
    width: 100%;
    box-shadow: 0 30px 90px rgba(0, 0, 0, 0.55), 0 0 0 1px rgba(16, 185, 129, 0.15);
    color: #f1f5f9;
    text-align: center;
    position: relative;
    animation: um-pop 0.25s cubic-bezier(.2, .9, .3, 1.2);
  }
  @keyframes um-pop {
    0%   { opacity: 0; transform: scale(0.92) translateY(10px); }
    100% { opacity: 1; transform: scale(1) translateY(0); }
  }

  .um-close {
    position: absolute;
    top: 14px;
    right: 16px;
    width: 32px;
    height: 32px;
    border: none;
    background: rgba(255, 255, 255, 0.06);
    color: #94a3b8;
    border-radius: 50%;
    font-size: 18px;
    cursor: pointer;
    transition: all 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .um-close:hover { background: rgba(255, 255, 255, 0.12); color: #f1f5f9; }

  .um-icon {
    font-size: 56px;
    margin-bottom: 14px;
    line-height: 1;
  }

  .um-title {
    font-size: 22px;
    font-weight: 800;
    margin: 0 0 10px;
    color: #f1f5f9;
    letter-spacing: -0.01em;
  }

  .um-subtitle {
    font-size: 15px;
    color: #cbd5e1;
    margin: 0 0 22px;
    line-height: 1.55;
  }

  .um-features {
    background: rgba(16, 185, 129, 0.08);
    border: 1px solid rgba(16, 185, 129, 0.18);
    border-radius: 14px;
    padding: 14px 18px;
    margin-bottom: 22px;
    text-align: left;
  }
  .um-features li {
    font-size: 13.5px;
    color: #d1fae5;
    margin: 6px 0;
    list-style: none;
    padding-left: 22px;
    position: relative;
  }
  .um-features li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #34d399;
    font-weight: 700;
  }
  .um-features ul { margin: 0; padding: 0; }

  .um-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
  }

  .um-btn {
    padding: 13px 22px;
    border: none;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: all 0.18s ease;
    text-align: center;
    font-family: inherit;
  }
  .um-btn-primary {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: #ffffff;
    box-shadow: 0 8px 22px rgba(16, 185, 129, 0.35);
  }
  .um-btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 12px 28px rgba(16, 185, 129, 0.45);
    color: #ffffff;
    text-decoration: none;
  }
  .um-btn-secondary {
    background: rgba(255, 255, 255, 0.06);
    color: #cbd5e1;
    border: 1px solid rgba(255, 255, 255, 0.12);
  }
  .um-btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #f1f5f9;
    text-decoration: none;
  }

  .um-trial-note {
    font-size: 12px;
    color: #94a3b8;
    margin-top: 14px;
  }

  @media (max-width: 480px) {
    .um-modal { padding: 28px 22px 22px; border-radius: 18px; }
    .um-title { font-size: 19px; }
    .um-subtitle { font-size: 14px; }
    .um-icon { font-size: 48px; }
  }
</style>

<div id="umOverlay" class="um-overlay" role="dialog" aria-modal="true" aria-labelledby="umTitle">
  <div class="um-modal">
    <button class="um-close" id="umClose" aria-label="Close">×</button>

    <div class="um-icon">🌟</div>

    <h2 class="um-title" id="umTitle">প্রিমিয়াম ফিচার</h2>

    <p class="um-subtitle">
      এই AI জেনারেশন ফিচারটি ব্যবহার করতে একটি অ্যাকটিভ সাবস্ক্রিপশন প্রয়োজন।
      আপগ্রেড করে সব ফিচার আনলক করুন।
    </p>

    <div class="um-features">
      <ul>
        <li>সব শ্রেণির সব বিষয় — সীমাহীন</li>
        <li>সব ৪৩+ AI টুলস সীমাহীন</li>
        <li>AI প্রশ্ন, উত্তর ও সমাধান জেনারেটর</li>
        <li>সার্টিফিকেট অর্জন</li>
      </ul>
    </div>

    <div class="um-actions">
      <a href="/pricing/" class="um-btn um-btn-primary">
        আপগ্রেড করুন →
      </a>
      <button class="um-btn um-btn-secondary" id="umDismiss">
        পরে দেখব
      </button>
    </div>

    <div class="um-trial-note">
      🎁 নতুন অ্যাকাউন্টে ৩ দিনের সম্পূর্ণ বিনামূল্যে ট্রায়াল
    </div>
  </div>
</div>

<script>
(function(){
  if (window.__upgradeModalInstalled) return;
  window.__upgradeModalInstalled = true;

  var overlay = document.getElementById('umOverlay');
  var closeBtn = document.getElementById('umClose');
  var dismissBtn = document.getElementById('umDismiss');
  if (!overlay) return;

  function showModal() {
    overlay.classList.add('um-active');
    document.body.style.overflow = 'hidden';
  }
  function hideModal() {
    overlay.classList.remove('um-active');
    document.body.style.overflow = '';
  }
  closeBtn && closeBtn.addEventListener('click', hideModal);
  dismissBtn && dismissBtn.addEventListener('click', hideModal);
  overlay.addEventListener('click', function(e){
    if (e.target === overlay) hideModal();
  });
  document.addEventListener('keydown', function(e){
    if (e.key === 'Escape' && overlay.classList.contains('um-active')) hideModal();
  });

  // Detect 402 from any fetch — that's what SubscriptionGateMiddleware returns
  var origFetch = window.fetch;
  window.fetch = function(){
    return origFetch.apply(this, arguments).then(function(response){
      try {
        if (response && response.status === 402) {
          var clone = response.clone();
          clone.json().then(function(data){
            if (data && data.error === 'subscription_required') {
              showModal();
            }
          }).catch(function(){
            showModal(); // any 402 — show the modal
          });
        }
      } catch (e) { /* swallow — never break user's fetch */ }
      return response;
    });
  };

  // Also handle XMLHttpRequest in case any code paths still use it
  var XHR = window.XMLHttpRequest;
  if (XHR && XHR.prototype && XHR.prototype.send) {
    var origSend = XHR.prototype.send;
    XHR.prototype.send = function(){
      var xhr = this;
      var origOnReady = xhr.onreadystatechange;
      xhr.onreadystatechange = function(){
        try {
          if (xhr.readyState === 4 && xhr.status === 402) {
            showModal();
          }
        } catch (e) {}
        if (origOnReady) origOnReady.apply(xhr, arguments);
      };
      return origSend.apply(this, arguments);
    };
  }
})();
</script>