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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>Study Manager</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>
        .tab-content {
            display: none;
        }
        .tab-content.active {
            display: block;
            animation: fadeIn 0.5s;
        }
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }
        .progress-bar {
            height: 20px;
            border-radius: 10px;
            background-color: #e0e0e0;
            overflow: hidden;
        }
        .progress-fill {
            height: 100%;
            border-radius: 10px;
            background-color: #4CAF50;
            transition: width 0.3s ease;
        }
        .session-cell {
            min-height: 60px;
            position: relative;
        }
        .session-content {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            padding: 4px;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        .draggable {
            cursor: move;
        }
        .dropzone {
            min-height: 60px;
            border: 2px dashed #ccc;
            border-radius: 5px;
            margin-bottom: 10px;
            padding: 10px;
        }
        .dropzone.highlight {
            border-color: #4CAF50;
            background-color: #f0fff0;
        }
    </style>
</head>
<body class="bg-gray-100 font-sans">
    <div class="container mx-auto px-4 py-8 max-w-6xl">
        <header class="mb-8 text-center">
            <h1 class="text-4xl font-bold text-indigo-700 mb-2">Study Manager</h1>
            <p class="text-gray-600">Organize your academic life efficiently</p>
        </header>

        <div class="bg-white rounded-lg shadow-lg overflow-hidden mb-8">
            <div class="flex border-b border-gray-200">
                <button class="tab-btn py-4 px-6 font-medium text-gray-600 hover:text-indigo-600 hover:bg-gray-50 transition duration-300 active" data-tab="tasks">
                    <i class="fas fa-tasks mr-2"></i>Tasks
                </button>
                <button class="tab-btn py-4 px-6 font-medium text-gray-600 hover:text-indigo-600 hover:bg-gray-50 transition duration-300" data-tab="lessons">
                    <i class="fas fa-book mr-2"></i>Lessons
                </button>
                <button class="tab-btn py-4 px-6 font-medium text-gray-600 hover:text-indigo-600 hover:bg-gray-50 transition duration-300" data-tab="weekly-plans">
                    <i class="fas fa-calendar-week mr-2"></i>Weekly Plans
                </button>
                <button class="tab-btn py-4 px-6 font-medium text-gray-600 hover:text-indigo-600 hover:bg-gray-50 transition duration-300" data-tab="timetable">
                    <i class="fas fa-calendar-alt mr-2"></i>Timetable
                </button>
                <button class="tab-btn py-4 px-6 font-medium text-gray-600 hover:text-indigo-600 hover:bg-gray-50 transition duration-300" data-tab="exams">
                    <i class="fas fa-file-alt mr-2"></i>Exams
                </button>
            </div>

            <!-- Tasks Tab -->
            <div id="tasks" class="tab-content active p-6">
                <div class="mb-6">
                    <h2 class="text-2xl font-semibold text-gray-800 mb-4">My Tasks</h2>
                    <div class="flex mb-4">
                        <input type="text" id="new-task" placeholder="Add a new task..." class="flex-grow px-4 py-2 border border-gray-300 rounded-l-lg focus:outline-none focus:ring-2 focus:ring-indigo-500">
                        <button id="add-task" class="bg-indigo-600 text-white px-4 py-2 rounded-r-lg hover:bg-indigo-700 transition duration-300">
                            <i class="fas fa-plus mr-1"></i> Add
                        </button>
                    </div>
                    <div id="tasks-container" class="space-y-3">
                        <!-- Tasks will be added here -->
                    </div>
                </div>
            </div>

            <!-- Lessons Tab -->
            <div id="lessons" class="tab-content p-6">
                <div class="mb-6">
                    <h2 class="text-2xl font-semibold text-gray-800 mb-4">My Lessons</h2>
                    <div class="flex mb-4">
                        <input type="text" id="new-lesson" placeholder="Add a new lesson..." class="flex-grow px-4 py-2 border border-gray-300 rounded-l-lg focus:outline-none focus:ring-2 focus:ring-indigo-500">
                        <button id="add-lesson" class="bg-indigo-600 text-white px-4 py-2 rounded-r-lg hover:bg-indigo-700 transition duration-300">
                            <i class="fas fa-plus mr-1"></i> Add
                        </button>
                    </div>
                    <div id="lessons-container" class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
                        <!-- Lessons will be added here -->
                    </div>
                </div>
            </div>

            <!-- Weekly Plans Tab -->
            <div id="weekly-plans" class="tab-content p-6">
                <h2 class="text-2xl font-semibold text-gray-800 mb-6">Weekly Study Plan</h2>
                
                <div class="mb-6">
                    <div class="flex items-center mb-4">
                        <input type="text" id="new-session" placeholder="Enter session content..." class="flex-grow px-4 py-2 border border-gray-300 rounded-l-lg focus:outline-none focus:ring-2 focus:ring-indigo-500">
                        <button id="add-session" class="bg-indigo-600 text-white px-4 py-2 rounded-r-lg hover:bg-indigo-700 transition duration-300">
                            <i class="fas fa-plus mr-1"></i> Create Session
                        </button>
                    </div>
                    <div id="sessions-pool" class="dropzone grid grid-cols-2 md:grid-cols-3 lg:grid-cols-4 gap-3 mb-6 p-4">
                        <p class="col-span-full text-gray-500 text-sm">Drag sessions from here to the weekly plan below</p>
                        <!-- Sessions will be added here -->
                    </div>
                </div>
                
                <div class="overflow-x-auto">
                    <div class="flex space-x-4 mb-6">
                        <button class="day-btn px-4 py-2 bg-indigo-100 text-indigo-700 rounded-lg font-medium" data-day="sunday">Sunday</button>
                        <button class="day-btn px-4 py-2 bg-gray-100 text-gray-700 rounded-lg font-medium" data-day="monday">Monday</button>
                        <button class="day-btn px-4 py-2 bg-gray-100 text-gray-700 rounded-lg font-medium" data-day="tuesday">Tuesday</button>
                        <button class="day-btn px-4 py-2 bg-gray-100 text-gray-700 rounded-lg font-medium" data-day="wednesday">Wednesday</button>
                        <button class="day-btn px-4 py-2 bg-gray-100 text-gray-700 rounded-lg font-medium" data-day="thursday">Thursday</button>
                    </div>
                    
                    <div id="weekly-plan-container">
                        <!-- Sunday Plan (default visible) -->
                        <div id="sunday-plan" class="day-plan">
                            <table class="min-w-full bg-white rounded-lg overflow-hidden">
                                <thead class="bg-gray-100">
                                    <tr>
                                        <th class="py-3 px-4 text-left text-gray-700 font-semibold">Session</th>
                                        <th class="py-3 px-4 text-left text-gray-700 font-semibold">Time</th>
                                        <th class="py-3 px-4 text-left text-gray-700 font-semibold">Content</th>
                                    </tr>
                                </thead>
                                <tbody class="divide-y divide-gray-200">
                                    <!-- Sessions will be added here -->
                                </tbody>
                            </table>
                        </div>
                        
                        <!-- Other days' plans (hidden by default) -->
                        <div id="monday-plan" class="day-plan hidden"></div>
                        <div id="tuesday-plan" class="day-plan hidden"></div>
                        <div id="wednesday-plan" class="day-plan hidden"></div>
                        <div id="thursday-plan" class="day-plan hidden"></div>
                    </div>
                </div>
            </div>

            <!-- Timetable Tab -->
            <div id="timetable" class="tab-content p-6">
                <h2 class="text-2xl font-semibold text-gray-800 mb-6">Weekly Timetable</h2>
                
                <div class="overflow-x-auto">
                    <table class="min-w-full bg-white rounded-lg overflow-hidden shadow">
                        <thead class="bg-indigo-600 text-white">
                            <tr>
                                <th class="py-3 px-4 text-left">Time</th>
                                <th class="py-3 px-4 text-left">Sunday</th>
                                <th class="py-3 px-4 text-left">Monday</th>
                                <th class="py-3 px-4 text-left">Tuesday</th>
                                <th class="py-3 px-4 text-left">Wednesday</th>
                                <th class="py-3 px-4 text-left">Thursday</th>
                            </tr>
                        </thead>
                        <tbody class="divide-y divide-gray-200">
                            <!-- Timetable rows will be added here -->
                        </tbody>
                    </table>
                </div>
                
                <div class="mt-6">
                    <h3 class="text-lg font-medium text-gray-800 mb-3">Add New Subject</h3>
                    <div class="flex flex-wrap gap-4">
                        <select id="timetable-day" class="px-4 py-2 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-indigo-500">
                            <option value="sunday">Sunday</option>
                            <option value="monday">Monday</option>
                            <option value="tuesday">Tuesday</option>
                            <option value="wednesday">Wednesday</option>
                            <option value="thursday">Thursday</option>
                        </select>
                        <select id="timetable-session" class="px-4 py-2 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-indigo-500">
                            <option value="1">Session 1</option>
                            <option value="2">Session 2</option>
                            <option value="3">Session 3</option>
                            <option value="4">Session 4</option>
                            <option value="5">Session 5</option>
                            <option value="6">Session 6</option>
                            <option value="7">Session 7</option>
                        </select>
                        <input type="text" id="timetable-subject" placeholder="Subject name" class="flex-grow px-4 py-2 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-indigo-500">
                        <button id="add-timetable-subject" class="bg-indigo-600 text-white px-4 py-2 rounded-lg hover:bg-indigo-700 transition duration-300">
                            <i class="fas fa-plus mr-1"></i> Add Subject
                        </button>
                    </div>
                </div>
            </div>

            <!-- Exams Tab -->
            <div id="exams" class="tab-content p-6">
                <h2 class="text-2xl font-semibold text-gray-800 mb-6">My Exams</h2>
                
                <div class="mb-6 bg-indigo-50 p-4 rounded-lg">
                    <h3 class="text-lg font-medium text-indigo-800 mb-3">Add New Exam</h3>
                    <div class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-4">
                        <div>
                            <label for="exam-name" class="block text-sm font-medium text-gray-700 mb-1">Exam Name</label>
                            <input type="text" id="exam-name" placeholder="e.g. Math Final" class="w-full px-4 py-2 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-indigo-500">
                        </div>
                        <div>
                            <label for="exam-date" class="block text-sm font-medium text-gray-700 mb-1">Exam Date</label>
                            <input type="date" id="exam-date" class="w-full px-4 py-2 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-indigo-500">
                        </div>
                        <div>
                            <label for="exam-time" class="block text-sm font-medium text-gray-700 mb-1">Exam Time</label>
                            <input type="time" id="exam-time" class="w-full px-4 py-2 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-indigo-500">
                        </div>
                        <div class="flex items-end">
                            <button id="add-exam" class="bg-indigo-600 text-white px-4 py-2 rounded-lg hover:bg-indigo-700 transition duration-300 w-full">
                                <i class="fas fa-plus mr-1"></i> Add Exam
                            </button>
                        </div>
                    </div>
                </div>
                
                <div id="exams-container" class="space-y-6">
                    <!-- Exams will be added here -->
                </div>
            </div>
        </div>
    </div>

    <script>
        // Tab switching functionality
        document.querySelectorAll('.tab-btn').forEach(btn => {
            btn.addEventListener('click', () => {
                // Remove active class from all tabs and buttons
                document.querySelectorAll('.tab-btn').forEach(b => b.classList.remove('active'));
                document.querySelectorAll('.tab-content').forEach(tab => tab.classList.remove('active'));
                
                // Add active class to clicked tab and button
                btn.classList.add('active');
                const tabId = btn.getAttribute('data-tab');
                document.getElementById(tabId).classList.add('active');
            });
        });

        // Day switching for weekly plans
        document.querySelectorAll('.day-btn').forEach(btn => {
            btn.addEventListener('click', () => {
                // Remove active class from all day buttons
                document.querySelectorAll('.day-btn').forEach(b => {
                    b.classList.remove('bg-indigo-100', 'text-indigo-700');
                    b.classList.add('bg-gray-100', 'text-gray-700');
                });
                
                // Add active class to clicked button
                btn.classList.remove('bg-gray-100', 'text-gray-700');
                btn.classList.add('bg-indigo-100', 'text-indigo-700');
                
                // Hide all day plans
                document.querySelectorAll('.day-plan').forEach(plan => plan.classList.add('hidden'));
                
                // Show selected day plan
                const day = btn.getAttribute('data-day');
                document.getElementById(`${day}-plan`).classList.remove('hidden');
            });
        });

        // Tasks functionality
        const tasksContainer = document.getElementById('tasks-container');
        const addTaskBtn = document.getElementById('add-task');
        const newTaskInput = document.getElementById('new-task');

        function addTask(taskText) {
            if (!taskText.trim()) return;
            
            const taskId = 'task-' + Date.now();
            const taskElement = document.createElement('div');
            taskElement.className = 'flex items-center justify-between bg-white p-4 rounded-lg shadow-sm border border-gray-200';
            taskElement.id = taskId;
            taskElement.innerHTML = `
                <div class="flex items-center">
                    <input type="checkbox" class="mr-3 h-5 w-5 text-indigo-600 rounded focus:ring-indigo-500">
                    <span class="task-text">${taskText}</span>
                </div>
                <button class="delete-task text-gray-400 hover:text-red-500 transition duration-300">
                    <i class="fas fa-trash"></i>
                </button>
            `;
            
            tasksContainer.appendChild(taskElement);
            
            // Add event listeners
            const checkbox = taskElement.querySelector('input[type="checkbox"]');
            checkbox.addEventListener('change', function() {
                const taskTextElement = taskElement.querySelector('.task-text');
                if (this.checked) {
                    taskTextElement.classList.add('line-through', 'text-gray-400');
                } else {
                    taskTextElement.classList.remove('line-through', 'text-gray-400');
                }
            });
            
            const deleteBtn = taskElement.querySelector('.delete-task');
            deleteBtn.addEventListener('click', function() {
                tasksContainer.removeChild(taskElement);
            });
            
            newTaskInput.value = '';
        }

        addTaskBtn.addEventListener('click', () => addTask(newTaskInput.value));
        newTaskInput.addEventListener('keypress', (e) => {
            if (e.key === 'Enter') addTask(newTaskInput.value);
        });

        // Lessons functionality
        const lessonsContainer = document.getElementById('lessons-container');
        const addLessonBtn = document.getElementById('add-lesson');
        const newLessonInput = document.getElementById('new-lesson');

        function addLesson(lessonText) {
            if (!lessonText.trim()) return;
            
            const lessonId = 'lesson-' + Date.now();
            const lessonElement = document.createElement('div');
            lessonElement.className = 'bg-white p-4 rounded-lg shadow-sm border border-gray-200 hover:shadow-md transition duration-300';
            lessonElement.id = lessonId;
            lessonElement.innerHTML = `
                <div class="flex justify-between items-start mb-2">
                    <h3 class="font-medium text-gray-800">${lessonText}</h3>
                    <button class="delete-lesson text-gray-400 hover:text-red-500 transition duration-300">
                        <i class="fas fa-trash"></i>
                    </button>
                </div>
                <div class="flex items-center text-sm text-gray-500">
                    <span class="mr-3"><i class="far fa-calendar mr-1"></i> Not scheduled</span>
                    <span><i class="far fa-clock mr-1"></i> 0 min</span>
                </div>
            `;
            
            lessonsContainer.appendChild(lessonElement);
            
            // Add event listener for delete button
            const deleteBtn = lessonElement.querySelector('.delete-lesson');
            deleteBtn.addEventListener('click', function() {
                lessonsContainer.removeChild(lessonElement);
            });
            
            newLessonInput.value = '';
        }

        addLessonBtn.addEventListener('click', () => addLesson(newLessonInput.value));
        newLessonInput.addEventListener('keypress', (e) => {
            if (e.key === 'Enter') addLesson(newLessonInput.value);
        });

        // Weekly Plans functionality
        const sessionsPool = document.getElementById('sessions-pool');
        const addSessionBtn = document.getElementById('add-session');
        const newSessionInput = document.getElementById('new-session');
        const sundayPlanTable = document.querySelector('#sunday-plan tbody');

        // Initialize empty plans for all days
        const dayPlans = {
            sunday: sundayPlanTable,
            monday: document.querySelector('#monday-plan'),
            tuesday: document.querySelector('#tuesday-plan'),
            wednesday: document.querySelector('#wednesday-plan'),
            thursday: document.querySelector('#thursday-plan')
        };

        // Create tables for other days (similar to Sunday)
        ['monday', 'tuesday', 'wednesday', 'thursday'].forEach(day => {
            const planElement = dayPlans[day];
            planElement.innerHTML = `
                <table class="min-w-full bg-white rounded-lg overflow-hidden">
                    <thead class="bg-gray-100">
                        <tr>
                            <th class="py-3 px-4 text-left text-gray-700 font-semibold">Session</th>
                            <th class="py-3 px-4 text-left text-gray-700 font-semibold">Time</th>
                            <th class="py-3 px-4 text-left text-gray-700 font-semibold">Content</th>
                        </tr>
                    </thead>
                    <tbody class="divide-y divide-gray-200"></tbody>
                </table>
            `;
        });

        function addSessionToPool(sessionText) {
            if (!sessionText.trim()) return;
            
            const sessionId = 'session-' + Date.now();
            const sessionElement = document.createElement('div');
            sessionElement.className = 'bg-white p-3 rounded-lg shadow-sm border border-gray-200 draggable cursor-move';
            sessionElement.id = sessionId;
            sessionElement.setAttribute('draggable', 'true');
            sessionElement.innerHTML = `
                <div class="flex justify-between items-center">
                    <span>${sessionText}</span>
                    <button class="delete-session text-gray-400 hover:text-red-500 transition duration-300">
                        <i class="fas fa-trash text-sm"></i>
                    </button>
                </div>
            `;
            
            sessionsPool.appendChild(sessionElement);
            
            // Add event listeners
            const deleteBtn = sessionElement.querySelector('.delete-session');
            deleteBtn.addEventListener('click', function(e) {
                e.stopPropagation();
                sessionsPool.removeChild(sessionElement);
            });
            
            // Drag and drop functionality
            sessionElement.addEventListener('dragstart', function(e) {
                e.dataTransfer.setData('text/plain', sessionId);
                setTimeout(() => {
                    sessionElement.classList.add('opacity-0');
                }, 0);
            });
            
            sessionElement.addEventListener('dragend', function() {
                sessionElement.classList.remove('opacity-0');
            });
            
            newSessionInput.value = '';
        }

        addSessionBtn.addEventListener('click', () => addSessionToPool(newSessionInput.value));
        newSessionInput.addEventListener('keypress', (e) => {
            if (e.key === 'Enter') addSessionToPool(newSessionInput.value);
        });

        // Set up drop zones for each day's plan
        Object.keys(dayPlans).forEach(day => {
            const plan = dayPlans[day];
            const tbody = day === 'sunday' ? plan : plan.querySelector('tbody');
            
            // Create 7 session rows for each day
            for (let i = 1; i <= 7; i++) {
                const row = document.createElement('tr');
                row.className = 'hover:bg-gray-50';
                row.innerHTML = `
                    <td class="py-3 px-4">Session ${i}</td>
                    <td class="py-3 px-4">
                        <input type="time" class="border border-gray-300 rounded px-2 py-1 w-24">
                    </td>
                    <td class="py-3 px-4 dropzone session-cell" data-session="${i}"></td>
                `;
                tbody.appendChild(row);
                
                // Set up drop zone for this session
                const dropzone = row.querySelector('.dropzone');
                
                dropzone.addEventListener('dragover', function(e) {
                    e.preventDefault();
                    this.classList.add('highlight');
                });
                
                dropzone.addEventListener('dragleave', function() {
                    this.classList.remove('highlight');
                });
                
                dropzone.addEventListener('drop', function(e) {
                    e.preventDefault();
                    this.classList.remove('highlight');
                    
                    const sessionId = e.dataTransfer.getData('text/plain');
                    const sessionElement = document.getElementById(sessionId);
                    
                    if (sessionElement) {
                        // Clone the session element without the delete button
                        const clonedSession = sessionElement.cloneNode(true);
                        const deleteBtn = clonedSession.querySelector('.delete-session');
                        if (deleteBtn) deleteBtn.remove();
                        
                        // Clear the dropzone and append the cloned session
                        this.innerHTML = '';
                        this.appendChild(clonedSession);
                        
                        // Make the dropped session draggable again
                        clonedSession.setAttribute('draggable', 'true');
                        clonedSession.addEventListener('dragstart', function(e) {
                            e.dataTransfer.setData('text/plain', sessionId);
                            setTimeout(() => {
                                clonedSession.classList.add('opacity-0');
                            }, 0);
                        });
                        
                        clonedSession.addEventListener('dragend', function() {
                            clonedSession.classList.remove('opacity-0');
                        });
                    }
                });
            }
        });

        // Timetable functionality
        const timetableBody = document.querySelector('#timetable tbody');
        const addTimetableSubjectBtn = document.getElementById('add-timetable-subject');
        const timetableDaySelect = document.getElementById('timetable-day');
        const timetableSessionSelect = document.getElementById('timetable-session');
        const timetableSubjectInput = document.getElementById('timetable-subject');

        // Create 7 rows for the timetable (one for each session)
        for (let i = 1; i <= 7; i++) {
            const row = document.createElement('tr');
            row.className = 'hover:bg-gray-50';
            row.innerHTML = `
                <td class="py-3 px-4 font-medium">Session ${i}</td>
                <td class="py-3 px-4 session-cell" data-day="sunday" data-session="${i}"></td>
                <td class="py-3 px-4 session-cell" data-day="monday" data-session="${i}"></td>
                <td class="py-3 px-4 session-cell" data-day="tuesday" data-session="${i}"></td>
                <td class="py-3 px-4 session-cell" data-day="wednesday" data-session="${i}"></td>
                <td class="py-3 px-4 session-cell" data-day="thursday" data-session="${i}"></td>
            `;
            timetableBody.appendChild(row);
        }

        function addTimetableSubject() {
            const day = timetableDaySelect.value;
            const session = timetableSessionSelect.value;
            const subject = timetableSubjectInput.value.trim();
            
            if (!subject) return;
            
            // Find the correct cell
            const cell = document.querySelector(`.session-cell[data-day="${day}"][data-session="${session}"]`);
            
            if (cell) {
                // Create subject element
                const subjectElement = document.createElement('div');
                subjectElement.className = 'bg-indigo-100 text-indigo-800 px-3 py-1 rounded-full inline-flex items-center';
                subjectElement.innerHTML = `
                    <span>${subject}</span>
                    <button class="ml-2 text-indigo-400 hover:text-indigo-700 delete-subject">
                        <i class="fas fa-times"></i>
                    </button>
                `;
                
                // Add delete functionality
                const deleteBtn = subjectElement.querySelector('.delete-subject');
                deleteBtn.addEventListener('click', function() {
                    cell.removeChild(subjectElement);
                });
                
                // Add to cell
                cell.appendChild(subjectElement);
                timetableSubjectInput.value = '';
            }
        }

        addTimetableSubjectBtn.addEventListener('click', addTimetableSubject);
        timetableSubjectInput.addEventListener('keypress', (e) => {
            if (e.key === 'Enter') addTimetableSubject();
        });

        // Exams functionality
        const examsContainer = document.getElementById('exams-container');
        const addExamBtn = document.getElementById('add-exam');
        const examNameInput = document.getElementById('exam-name');
        const examDateInput = document.getElementById('exam-date');
        const examTimeInput = document.getElementById('exam-time');

        function addExam() {
            const name = examNameInput.value.trim();
            const date = examDateInput.value;
            const time = examTimeInput.value;
            
            if (!name || !date) return;
            
            const examId = 'exam-' + Date.now();
            const examElement = document.createElement('div');
            examElement.className = 'bg-white p-6 rounded-lg shadow-sm border border-gray-200';
            examElement.id = examId;
            
            // Format date for display
            const formattedDate = new Date(date).toLocaleDateString('en-US', {
                weekday: 'long',
                year: 'numeric',
                month: 'long',
                day: 'numeric'
            });
            
            examElement.innerHTML = `
                <div class="flex justify-between items-start mb-4">
                    <div>
                        <h3 class="text-xl font-semibold text-gray-800">${name}</h3>
                        <div class="text-gray-600 mt-1">
                            <i class="far fa-calendar-alt mr-1"></i> ${formattedDate}
                            ${time ? `<span class="ml-3"><i class="far fa-clock mr-1"></i> ${time}</span>` : ''}
                        </div>
                    </div>
                    <button class="delete-exam text-gray-400 hover:text-red-500 transition duration-300">
                        <i class="fas fa-trash"></i>
                    </button>
                </div>
                
                <div class="mb-4">
                    <h4 class="font-medium text-gray-700 mb-2">Materials to Study</h4>
                    <div class="flex mb-2">
                        <input type="text" class="exam-material-input flex-grow px-4 py-2 border border-gray-300 rounded-l-lg focus:outline-none focus:ring-2 focus:ring-indigo-500" placeholder="Add study material">
                        <button class="add-material bg-indigo-600 text-white px-4 py-2 rounded-r-lg hover:bg-indigo-700 transition duration-300">
                            <i class="fas fa-plus"></i>
                        </button>
                    </div>
                    <ul class="materials-list space-y-2 mt-3">
                        <!-- Materials will be added here -->
                    </ul>
                </div>
                
                <div>
                    <h4 class="font-medium text-gray-700 mb-2">Study Progress</h4>
                    <div class="progress-bar mb-2">
                        <div class="progress-fill" style="width: 0%"></div>
                    </div>
                    <p class="text-sm text-gray-500 progress-text">0% completed (0 of 0 materials studied)</p>
                </div>
            `;
            
            examsContainer.appendChild(examElement);
            
            // Add event listeners
            const deleteBtn = examElement.querySelector('.delete-exam');
            deleteBtn.addEventListener('click', function() {
                examsContainer.removeChild(examElement);
            });
            
            const addMaterialBtn = examElement.querySelector('.add-material');
            const materialInput = examElement.querySelector('.exam-material-input');
            const materialsList = examElement.querySelector('.materials-list');
            const progressFill = examElement.querySelector('.progress-fill');
            const progressText = examElement.querySelector('.progress-text');
            
            function updateProgress() {
                const totalMaterials = materialsList.children.length;
                const completedMaterials = materialsList.querySelectorAll('input[type="checkbox"]:checked').length;
                const percentage = totalMaterials > 0 ? Math.round((completedMaterials / totalMaterials) * 100) : 0;
                
                progressFill.style.width = `${percentage}%`;
                progressText.textContent = `${percentage}% completed (${completedMaterials} of ${totalMaterials} materials studied)`;
            }
            
            addMaterialBtn.addEventListener('click', function() {
                const materialText = materialInput.value.trim();
                if (!materialText) return;
                
                const materialId = 'material-' + Date.now();
                const materialElement = document.createElement('li');
                materialElement.className = 'flex items-center';
                materialElement.innerHTML = `
                    <input type="checkbox" class="mr-3 h-5 w-5 text-indigo-600 rounded focus:ring-indigo-500">
                    <span class="material-text flex-grow">${materialText}</span>
                    <button class="delete-material text-gray-400 hover:text-red-500 transition duration-300 ml-2">
                        <i class="fas fa-trash"></i>
                    </button>
                `;
                
                materialsList.appendChild(materialElement);
                materialInput.value = '';
                
                // Add event listeners for the new material
                const checkbox = materialElement.querySelector('input[type="checkbox"]');
                checkbox.addEventListener('change', updateProgress);
                
                const deleteMaterialBtn = materialElement.querySelector('.delete-material');
                deleteMaterialBtn.addEventListener('click', function() {
                    materialsList.removeChild(materialElement);
                    updateProgress();
                });
                
                updateProgress();
            });
            
            materialInput.addEventListener('keypress', function(e) {
                if (e.key === 'Enter') {
                    const materialText = materialInput.value.trim();
                    if (!materialText) return;
                    
                    const materialId = 'material-' + Date.now();
                    const materialElement = document.createElement('li');
                    materialElement.className = 'flex items-center';
                    materialElement.innerHTML = `
                        <input type="checkbox" class="mr-3 h-5 w-5 text-indigo-600 rounded focus:ring-indigo-500">
                        <span class="material-text flex-grow">${materialText}</span>
                        <button class="delete-material text-gray-400 hover:text-red-500 transition duration-300 ml-2">
                            <i class="fas fa-trash"></i>
                        </button>
                    `;
                    
                    materialsList.appendChild(materialElement);
                    materialInput.value = '';
                    
                    // Add event listeners for the new material
                    const checkbox = materialElement.querySelector('input[type="checkbox"]');
                    checkbox.addEventListener('change', updateProgress);
                    
                    const deleteMaterialBtn = materialElement.querySelector('.delete-material');
                    deleteMaterialBtn.addEventListener('click', function() {
                        materialsList.removeChild(materialElement);
                        updateProgress();
                    });
                    
                    updateProgress();
                }
            });
            
            // Clear form
            examNameInput.value = '';
            examDateInput.value = '';
            examTimeInput.value = '';
        }

        addExamBtn.addEventListener('click', addExam);
    </script>
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