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deepseek-task-matrix
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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>Task Matrix Pro</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>
        .task-card {
            transition: all 0.3s ease;
        }
        .task-card:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
        }
        .kanban-column {
            min-height: 400px;
        }
        .calendar-day {
            transition: all 0.2s ease;
        }
        .calendar-day:hover {
            background-color: #f3f4f6;
        }
        .calendar-day.has-tasks::after {
            content: '';
            display: block;
            width: 6px;
            height: 6px;
            background-color: #3b82f6;
            border-radius: 50%;
            margin: 2px auto 0;
        }
        .active-tab {
            border-bottom: 3px solid #3b82f6;
            font-weight: 600;
        }
        [draggable="true"] {
            cursor: move;
        }
        .kanban-column.highlight {
            background-color: #f0f9ff;
        }
    </style>
</head>
<body class="bg-gray-50 min-h-screen">
    <div class="container mx-auto px-4 py-8">
        <!-- Header -->
        <header class="mb-8">
            <h1 class="text-3xl font-bold text-gray-800">Task Matrix Pro</h1>
            <p class="text-gray-600">Organize your tasks with Eisenhower Matrix</p>
        </header>

        <!-- Navigation Tabs -->
        <div class="flex border-b border-gray-200 mb-6">
            <button id="matrix-tab" class="px-4 py-2 active-tab">Matrix View</button>
            <button id="kanban-tab" class="px-4 py-2">Kanban Board</button>
            <button id="calendar-tab" class="px-4 py-2">Calendar</button>
        </div>

        <!-- Matrix View -->
        <div id="matrix-view" class="view-content">
            <div class="grid grid-cols-1 md:grid-cols-2 gap-4 mb-6">
                <!-- Task Input Form -->
                <div class="bg-white p-4 rounded-lg shadow">
                    <h2 class="text-xl font-semibold mb-4">Add New Task</h2>
                    <form id="task-form" class="space-y-4">
                        <div>
                            <label for="task-title" class="block text-sm font-medium text-gray-700">Task Title</label>
                            <input type="text" id="task-title" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-blue-500 focus:ring-blue-500 p-2 border">
                        </div>
                        <div>
                            <label for="task-description" class="block text-sm font-medium text-gray-700">Description</label>
                            <textarea id="task-description" rows="2" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-blue-500 focus:ring-blue-500 p-2 border"></textarea>
                        </div>
                        <div class="grid grid-cols-2 gap-4">
                            <div>
                                <label class="block text-sm font-medium text-gray-700">Urgency</label>
                                <div class="mt-1 flex space-x-4">
                                    <label class="inline-flex items-center">
                                        <input type="radio" name="urgency" value="urgent" class="h-4 w-4 text-blue-600 focus:ring-blue-500">
                                        <span class="ml-2 text-sm text-gray-700">Urgent</span>
                                    </label>
                                    <label class="inline-flex items-center">
                                        <input type="radio" name="urgency" value="not-urgent" class="h-4 w-4 text-blue-600 focus:ring-blue-500">
                                        <span class="ml-2 text-sm text-gray-700">Not Urgent</span>
                                    </label>
                                </div>
                            </div>
                            <div>
                                <label class="block text-sm font-medium text-gray-700">Importance</label>
                                <div class="mt-1 flex space-x-4">
                                    <label class="inline-flex items-center">
                                        <input type="radio" name="importance" value="important" class="h-4 w-4 text-blue-600 focus:ring-blue-500">
                                        <span class="ml-2 text-sm text-gray-700">Important</span>
                                    </label>
                                    <label class="inline-flex items-center">
                                        <input type="radio" name="importance" value="not-important" class="h-4 w-4 text-blue-600 focus:ring-blue-500">
                                        <span class="ml-2 text-sm text-gray-700">Not Important</span>
                                    </label>
                                </div>
                            </div>
                        </div>
                        <div>
                            <label for="task-due" class="block text-sm font-medium text-gray-700">Due Date</label>
                            <input type="date" id="task-due" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-blue-500 focus:ring-blue-500 p-2 border">
                        </div>
                        <button type="submit" class="w-full bg-blue-600 text-white py-2 px-4 rounded-md hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:ring-offset-2">
                            Add Task
                        </button>
                    </form>
                </div>

                <!-- Eisenhower Matrix Explanation -->
                <div class="bg-white p-4 rounded-lg shadow">
                    <h2 class="text-xl font-semibold mb-4">Eisenhower Matrix Guide</h2>
                    <div class="grid grid-cols-2 gap-2">
                        <div class="bg-red-100 p-3 rounded">
                            <h3 class="font-medium text-red-800">Urgent & Important</h3>
                            <p class="text-sm text-red-700">Do these tasks immediately</p>
                        </div>
                        <div class="bg-yellow-100 p-3 rounded">
                            <h3 class="font-medium text-yellow-800">Important, Not Urgent</h3>
                            <p class="text-sm text-yellow-700">Schedule these tasks</p>
                        </div>
                        <div class="bg-blue-100 p-3 rounded">
                            <h3 class="font-medium text-blue-800">Urgent, Not Important</h3>
                            <p class="text-sm text-blue-700">Delegate if possible</p>
                        </div>
                        <div class="bg-green-100 p-3 rounded">
                            <h3 class="font-medium text-green-800">Not Urgent, Not Important</h3>
                            <p class="text-sm text-green-700">Consider eliminating</p>
                        </div>
                    </div>
                    <div class="mt-4 text-sm text-gray-600">
                        <p>The Eisenhower Matrix helps you prioritize tasks based on urgency and importance. This method was popularized by US President Dwight D. Eisenhower.</p>
                    </div>
                </div>
            </div>

            <!-- Task Matrix -->
            <div class="grid grid-cols-1 md:grid-cols-2 gap-4">
                <!-- Quadrant 1: Urgent & Important -->
                <div class="bg-red-50 p-4 rounded-lg shadow">
                    <h2 class="text-lg font-semibold text-red-800 mb-4 flex items-center">
                        <i class="fas fa-exclamation-triangle mr-2"></i> Urgent & Important
                    </h2>
                    <div id="quadrant-1" class="space-y-3">
                        <!-- Tasks will be added here dynamically -->
                    </div>
                </div>

                <!-- Quadrant 2: Important, Not Urgent -->
                <div class="bg-yellow-50 p-4 rounded-lg shadow">
                    <h2 class="text-lg font-semibold text-yellow-800 mb-4 flex items-center">
                        <i class="fas fa-calendar-check mr-2"></i> Important, Not Urgent
                    </h2>
                    <div id="quadrant-2" class="space-y-3">
                        <!-- Tasks will be added here dynamically -->
                    </div>
                </div>

                <!-- Quadrant 3: Urgent, Not Important -->
                <div class="bg-blue-50 p-4 rounded-lg shadow">
                    <h2 class="text-lg font-semibold text-blue-800 mb-4 flex items-center">
                        <i class="fas fa-share-square mr-2"></i> Urgent, Not Important
                    </h2>
                    <div id="quadrant-3" class="space-y-3">
                        <!-- Tasks will be added here dynamically -->
                    </div>
                </div>

                <!-- Quadrant 4: Not Urgent, Not Important -->
                <div class="bg-green-50 p-4 rounded-lg shadow">
                    <h2 class="text-lg font-semibold text-green-800 mb-4 flex items-center">
                        <i class="fas fa-trash-alt mr-2"></i> Not Urgent, Not Important
                    </h2>
                    <div id="quadrant-4" class="space-y-3">
                        <!-- Tasks will be added here dynamically -->
                    </div>
                </div>
            </div>
        </div>

        <!-- Kanban Board View (hidden by default) -->
        <div id="kanban-view" class="view-content hidden">
            <div class="grid grid-cols-1 md:grid-cols-3 gap-6">
                <!-- Backlog Column -->
                <div class="bg-gray-100 p-4 rounded-lg shadow kanban-column" 
                     id="backlog-column"
                     ondrop="handleDrop(event, 'backlog')" 
                     ondragover="handleDragOver(event)" 
                     ondragenter="handleDragEnter(event)" 
                     ondragleave="handleDragLeave(event)">
                    <h2 class="text-lg font-semibold text-gray-800 mb-4 flex items-center justify-between">
                        <span><i class="fas fa-clipboard-list mr-2"></i> Backlog</span>
                        <span id="backlog-count" class="bg-gray-200 text-gray-700 text-xs font-medium px-2.5 py-0.5 rounded-full">0</span>
                    </h2>
                    <div id="backlog-tasks" class="space-y-3">
                        <!-- Tasks will be added here dynamically -->
                    </div>
                </div>

                <!-- In Progress Column -->
                <div class="bg-blue-100 p-4 rounded-lg shadow kanban-column" 
                     id="progress-column"
                     ondrop="handleDrop(event, 'progress')" 
                     ondragover="handleDragOver(event)" 
                     ondragenter="handleDragEnter(event)" 
                     ondragleave="handleDragLeave(event)">
                    <h2 class="text-lg font-semibold text-blue-800 mb-4 flex items-center justify-between">
                        <span><i class="fas fa-spinner mr-2"></i> In Progress</span>
                        <span id="progress-count" class="bg-blue-200 text-blue-800 text-xs font-medium px-2.5 py-0.5 rounded-full">0</span>
                    </h2>
                    <div id="progress-tasks" class="space-y-3">
                        <!-- Tasks will be added here dynamically -->
                    </div>
                </div>

                <!-- Done Column -->
                <div class="bg-green-100 p-4 rounded-lg shadow kanban-column" 
                     id="done-column"
                     ondrop="handleDrop(event, 'done')" 
                     ondragover="handleDragOver(event)" 
                     ondragenter="handleDragEnter(event)" 
                     ondragleave="handleDragLeave(event)">
                    <h2 class="text-lg font-semibold text-green-800 mb-4 flex items-center justify-between">
                        <span><i class="fas fa-check-circle mr-2"></i> Done</span>
                        <span id="done-count" class="bg-green-200 text-green-800 text-xs font-medium px-2.5 py-0.5 rounded-full">0</span>
                    </h2>
                    <div id="done-tasks" class="space-y-3">
                        <!-- Tasks will be added here dynamically -->
                    </div>
                </div>
            </div>
        </div>

        <!-- Calendar View (hidden by default) -->
        <div id="calendar-view" class="view-content hidden">
            <div class="bg-white p-4 rounded-lg shadow mb-6">
                <div class="flex items-center justify-between mb-4">
                    <button id="prev-month" class="p-2 rounded-full hover:bg-gray-100">
                        <i class="fas fa-chevron-left"></i>
                    </button>
                    <h2 id="current-month" class="text-xl font-semibold">July 2023</h2>
                    <button id="next-month" class="p-2 rounded-full hover:bg-gray-100">
                        <i class="fas fa-chevron-right"></i>
                    </button>
                </div>
                <div class="grid grid-cols-7 gap-1">
                    <div class="text-center font-medium text-gray-500 py-2">Sun</div>
                    <div class="text-center font-medium text-gray-500 py-2">Mon</div>
                    <div class="text-center font-medium text-gray-500 py-2">Tue</div>
                    <div class="text-center font-medium text-gray-500 py-2">Wed</div>
                    <div class="text-center font-medium text-gray-500 py-2">Thu</div>
                    <div class="text-center font-medium text-gray-500 py-2">Fri</div>
                    <div class="text-center font-medium text-gray-500 py-2">Sat</div>
                </div>
                <div id="calendar-days" class="grid grid-cols-7 gap-1">
                    <!-- Calendar days will be generated here -->
                </div>
            </div>

            <div id="day-tasks" class="bg-white p-4 rounded-lg shadow">
                <h2 id="selected-day" class="text-xl font-semibold mb-4">Select a date to view tasks</h2>
                <div id="day-tasks-list" class="space-y-3">
                    <!-- Tasks for selected day will appear here -->
                </div>
            </div>
        </div>
    </div>

    <script>
        // Task data structure
        let tasks = [];
        let currentDate = new Date();
        let selectedDay = null;
        let draggedTaskId = null;

        // DOM Elements
        const taskForm = document.getElementById('task-form');
        const matrixView = document.getElementById('matrix-view');
        const kanbanView = document.getElementById('kanban-view');
        const calendarView = document.getElementById('calendar-view');
        const views = [matrixView, kanbanView, calendarView];
        
        // Tab buttons
        const matrixTab = document.getElementById('matrix-tab');
        const kanbanTab = document.getElementById('kanban-tab');
        const calendarTab = document.getElementById('calendar-tab');
        const tabs = [matrixTab, kanbanTab, calendarTab];

        // Calendar elements
        const prevMonthBtn = document.getElementById('prev-month');
        const nextMonthBtn = document.getElementById('next-month');
        const currentMonthEl = document.getElementById('current-month');
        const calendarDaysEl = document.getElementById('calendar-days');
        const selectedDayEl = document.getElementById('selected-day');
        const dayTasksListEl = document.getElementById('day-tasks-list');

        // Initialize the app
        document.addEventListener('DOMContentLoaded', function() {
            // Load tasks from localStorage if available
            const savedTasks = localStorage.getItem('tasks');
            if (savedTasks) {
                tasks = JSON.parse(savedTasks);
            } else {
                // Initialize with some sample tasks if none exist
                tasks = [
                    {
                        id: '1',
                        title: 'Complete project proposal',
                        description: 'Finish writing the project proposal document',
                        dueDate: formatDateForInput(new Date()),
                        urgency: 'urgent',
                        importance: 'important',
                        status: 'progress',
                        createdAt: new Date().toISOString()
                    },
                    {
                        id: '2',
                        title: 'Schedule team meeting',
                        description: 'Plan next week\'s team meeting',
                        dueDate: formatDateForInput(new Date(Date.now() + 86400000 * 2)),
                        urgency: 'not-urgent',
                        importance: 'important',
                        status: 'backlog',
                        createdAt: new Date().toISOString()
                    }
                ];
                saveTasks();
            }
            
            // Set up event listeners
            setupEventListeners();
            
            // Render initial views
            renderMatrixView();
            renderKanbanView();
            renderCalendar();
            
            // Set matrix view as default
            switchView(0);
        });

        // Set up event listeners
        function setupEventListeners() {
            // Task form submission
            taskForm.addEventListener('submit', function(e) {
                e.preventDefault();
                addNewTask();
            });

            // Tab switching
            tabs.forEach((tab, index) => {
                tab.addEventListener('click', () => switchView(index));
            });

            // Calendar navigation
            prevMonthBtn.addEventListener('click', () => {
                currentDate.setMonth(currentDate.getMonth() - 1);
                renderCalendar();
            });

            nextMonthBtn.addEventListener('click', () => {
                currentDate.setMonth(currentDate.getMonth() + 1);
                renderCalendar();
            });
        }

        // Switch between views
        function switchView(index) {
            views.forEach(view => view.classList.add('hidden'));
            views[index].classList.remove('hidden');
            
            tabs.forEach(tab => tab.classList.remove('active-tab'));
            tabs[index].classList.add('active-tab');
            
            // Update specific views when switched to
            if (index === 1) renderKanbanView();
            if (index === 2) renderCalendar();
        }

        // Add a new task
        function addNewTask() {
            const title = document.getElementById('task-title').value.trim();
            const description = document.getElementById('task-description').value.trim();
            const dueDate = document.getElementById('task-due').value;
            const urgency = document.querySelector('input[name="urgency"]:checked')?.value;
            const importance = document.querySelector('input[name="importance"]:checked')?.value;
            
            if (!title || !urgency || !importance) {
                alert('Please fill in all required fields');
                return;
            }
            
            const newTask = {
                id: Date.now().toString(),
                title,
                description,
                dueDate,
                urgency,
                importance,
                status: 'backlog', // Default status for Kanban
                createdAt: new Date().toISOString()
            };
            
            tasks.push(newTask);
            saveTasks();
            renderMatrixView();
            renderKanbanView();
            renderCalendar();
            
            // Reset form
            taskForm.reset();
        }

        // Save tasks to localStorage
        function saveTasks() {
            localStorage.setItem('tasks', JSON.stringify(tasks));
        }

        // Render the matrix view
        function renderMatrixView() {
            const quadrants = {
                'quadrant-1': { urgency: 'urgent', importance: 'important' },
                'quadrant-2': { urgency: 'not-urgent', importance: 'important' },
                'quadrant-3': { urgency: 'urgent', importance: 'not-important' },
                'quadrant-4': { urgency: 'not-urgent', importance: 'not-important' }
            };
            
            // Clear all quadrants
            for (const quadrantId in quadrants) {
                document.getElementById(quadrantId).innerHTML = '';
            }
            
            // Add tasks to their respective quadrants
            tasks.forEach(task => {
                const { urgency, importance } = task;
                let quadrantId = '';
                
                if (urgency === 'urgent' && importance === 'important') {
                    quadrantId = 'quadrant-1';
                } else if (urgency === 'not-urgent' && importance === 'important') {
                    quadrantId = 'quadrant-2';
                } else if (urgency === 'urgent' && importance === 'not-important') {
                    quadrantId = 'quadrant-3';
                } else {
                    quadrantId = 'quadrant-4';
                }
                
                const taskElement = createTaskElement(task, true);
                document.getElementById(quadrantId).appendChild(taskElement);
            });
        }

        // Render the kanban view
        function renderKanbanView() {
            const statuses = ['backlog', 'progress', 'done'];
            const statusIds = ['backlog-tasks', 'progress-tasks', 'done-tasks'];
            const countIds = ['backlog-count', 'progress-count', 'done-count'];
            
            // Clear all columns
            statusIds.forEach(id => {
                document.getElementById(id).innerHTML = '';
            });
            
            // Update counts
            statuses.forEach((status, index) => {
                const count = tasks.filter(task => task.status === status).length;
                document.getElementById(countIds[index]).textContent = count;
            });
            
            // Add tasks to their respective columns
            tasks.forEach(task => {
                let columnId = '';
                switch(task.status) {
                    case 'backlog': columnId = 'backlog-tasks'; break;
                    case 'progress': columnId = 'progress-tasks'; break;
                    case 'done': columnId = 'done-tasks'; break;
                }
                
                const taskElement = createTaskElement(task, false);
                taskElement.setAttribute('draggable', 'true');
                taskElement.addEventListener('dragstart', (e) => {
                    draggedTaskId = task.id;
                    e.dataTransfer.setData('text/plain', task.id);
                    e.currentTarget.classList.add('opacity-50');
                });
                taskElement.addEventListener('dragend', (e) => {
                    e.currentTarget.classList.remove('opacity-50');
                });
                
                document.getElementById(columnId).appendChild(taskElement);
            });
        }

        // Drag and drop handlers
        function handleDragStart(e) {
            draggedTaskId = e.target.dataset.id;
            e.dataTransfer.setData('text/plain', draggedTaskId);
            e.target.classList.add('opacity-50');
        }

        function handleDragEnd(e) {
            e.target.classList.remove('opacity-50');
        }

        function handleDragOver(e) {
            e.preventDefault();
        }

        function handleDragEnter(e) {
            if (e.target.classList.contains('kanban-column')) {
                e.target.classList.add('highlight');
            }
        }

        function handleDragLeave(e) {
            if (e.target.classList.contains('kanban-column')) {
                e.target.classList.remove('highlight');
            }
        }

        function handleDrop(e, newStatus) {
            e.preventDefault();
            e.target.classList.remove('highlight');
            
            const taskId = e.dataTransfer.getData('text/plain');
            const taskIndex = tasks.findIndex(task => task.id === taskId);
            
            if (taskIndex !== -1) {
                tasks[taskIndex].status = newStatus;
                saveTasks();
                renderKanbanView();
            }
        }

        // Render the calendar
        function renderCalendar() {
            // Update month display
            const options = { month: 'long', year: 'numeric' };
            currentMonthEl.textContent = currentDate.toLocaleDateString('en-US', options);
            
            // Get first day of month and total days
            const firstDay = new Date(currentDate.getFullYear(), currentDate.getMonth(), 1).getDay();
            const daysInMonth = new Date(currentDate.getFullYear(), currentDate.getMonth() + 1, 0).getDate();
            
            // Clear calendar
            calendarDaysEl.innerHTML = '';
            
            // Add empty cells for days before the first day of the month
            for (let i = 0; i < firstDay; i++) {
                const emptyCell = document.createElement('div');
                emptyCell.className = 'h-12';
                calendarDaysEl.appendChild(emptyCell);
            }
            
            // Add cells for each day of the month
            for (let day = 1; day <= daysInMonth; day++) {
                const dayCell = document.createElement('div');
                dayCell.className = 'h-12 border border-gray-200 flex items-center justify-center calendar-day';
                dayCell.textContent = day;
                
                // Check if this day has tasks
                const dateStr = `${currentDate.getFullYear()}-${(currentDate.getMonth() + 1).toString().padStart(2, '0')}-${day.toString().padStart(2, '0')}`;
                const dayTasks = tasks.filter(task => task.dueDate === dateStr);
                
                if (dayTasks.length > 0) {
                    dayCell.classList.add('has-tasks');
                }
                
                // Add click event to show tasks for this day
                dayCell.addEventListener('click', () => {
                    selectedDay = dateStr;
                    showDayTasks(dateStr);
                });
                
                calendarDaysEl.appendChild(dayCell);
            }
        }

        // Show tasks for a specific day
        function showDayTasks(dateStr) {
            const date = new Date(dateStr);
            const options = { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' };
            selectedDayEl.textContent = date.toLocaleDateString('en-US', options);
            
            // Filter tasks for this day
            const dayTasks = tasks.filter(task => task.dueDate === dateStr);
            
            // Clear previous tasks
            dayTasksListEl.innerHTML = '';
            
            if (dayTasks.length === 0) {
                dayTasksListEl.innerHTML = '<p class="text-gray-500">No tasks for this day</p>';
                return;
            }
            
            // Add tasks to the list
            dayTasks.forEach(task => {
                const taskElement = createTaskElement(task, true);
                dayTasksListEl.appendChild(taskElement);
            });
        }

        // Create a task element
        function createTaskElement(task, showDelete) {
            const taskElement = document.createElement('div');
            taskElement.className = 'bg-white p-3 rounded shadow task-card';
            taskElement.id = `task-${task.id}`;
            taskElement.dataset.id = task.id;
            
            // Determine priority color
            let priorityClass = '';
            if (task.urgency === 'urgent' && task.importance === 'important') {
                priorityClass = 'bg-red-100 text-red-800';
            } else if (task.urgency === 'not-urgent' && task.importance === 'important') {
                priorityClass = 'bg-yellow-100 text-yellow-800';
            } else if (task.urgency === 'urgent' && task.importance === 'not-important') {
                priorityClass = 'bg-blue-100 text-blue-800';
            } else {
                priorityClass = 'bg-green-100 text-green-800';
            }
            
            // Task content
            taskElement.innerHTML = `
                <div class="flex justify-between items-start mb-1">
                    <h3 class="font-medium">${task.title}</h3>
                    <span class="text-xs px-2 py-1 rounded-full ${priorityClass}">
                        ${task.urgency === 'urgent' ? 'Urgent' : 'Not Urgent'}, 
                        ${task.importance === 'important' ? 'Important' : 'Not Important'}
                    </span>
                </div>
                ${task.description ? `<p class="text-sm text-gray-600 mb-2">${task.description}</p>` : ''}
                ${task.dueDate ? `<p class="text-xs text-gray-500"><i class="far fa-calendar-alt mr-1"></i> Due: ${formatDate(task.dueDate)}</p>` : ''}
                <div class="mt-2 flex justify-between items-center">
                    <span class="text-xs text-gray-400">Created: ${formatDate(task.createdAt, true)}</span>
                    ${showDelete ? `<button class="delete-task text-red-500 hover:text-red-700 text-sm" data-id="${task.id}">
                        <i class="fas fa-trash-alt"></i> Delete
                    </button>` : ''}
                </div>
            `;
            
            // Add delete event listener if needed
            if (showDelete) {
                const deleteBtn = taskElement.querySelector('.delete-task');
                deleteBtn.addEventListener('click', (e) => {
                    e.stopPropagation();
                    deleteTask(task.id);
                });
            }
            
            return taskElement;
        }

        // Delete a task
        function deleteTask(taskId) {
            if (confirm('Are you sure you want to delete this task?')) {
                tasks = tasks.filter(task => task.id !== taskId);
                saveTasks();
                renderMatrixView();
                renderKanbanView();
                renderCalendar();
                
                // If viewing day tasks, update that view too
                if (selectedDay) {
                    showDayTasks(selectedDay);
                }
            }
        }

        // Helper function to format dates
        function formatDate(dateStr, includeTime = false) {
            const date = new Date(dateStr);
            if (includeTime) {
                return date.toLocaleString('en-US', {
                    month: 'short',
                    day: 'numeric',
                    year: 'numeric',
                    hour: '2-digit',
                    minute: '2-digit'
                });
            } else {
                return date.toLocaleDateString('en-US', {
                    month: 'short',
                    day: 'numeric',
                    year: 'numeric'
                });
            }
        }

        // Helper function to format date for input field
        function formatDateForInput(date) {
            const d = new Date(date);
            let month = '' + (d.getMonth() + 1);
            let day = '' + d.getDate();
            const year = d.getFullYear();

            if (month.length < 2) month = '0' + month;
            if (day.length < 2) day = '0' + day;

            return [year, month, day].join('-');
        }
    </script>
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