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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>Todo App</title>
    <style>
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { 
            font-family: 'Segoe UI', system-ui, sans-serif; 
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh; 
            padding: 2rem;
            display: grid;
            place-items: center;
        }
        .container {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: 20px;
            padding: 2rem;
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
            width: 90%;
            max-width: 500px;
        }
        h1 { 
            text-align: center; 
            color: #333;
            margin-bottom: 1.5rem;
            font-weight: 600;
        }
        .input-section {
            display: flex;
            gap: 0.5rem;
            margin-bottom: 1.5rem;
        }
        input {
            flex: 1;
            padding: 0.75rem 1rem;
            border: 2px solid #e1e5e9;
            border-radius: 12px;
            font-size: 1rem;
            transition: all 0.3s ease;
        }
        input:focus {
            outline: none;
            border-color: #667eea;
            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
        }
        button {
            background: linear-gradient(135deg, #667eea, #764ba2);
            color: white;
            border: none;
            padding: 0.75rem 1.5rem;
            border-radius: 12px;
            cursor: pointer;
            font-weight: 600;
            transition: transform 0.2s ease;
        }
        button:hover { transform: translateY(-2px); }
        .todo-item {
            background: white;
            padding: 1rem;
            margin-bottom: 0.5rem;
            border-radius: 12px;
            display: flex;
            align-items: center;
            gap: 1rem;
            border: 2px solid #f0f0f0;
            transition: all 0.3s ease;
        }
        .todo-item:hover {
            border-color: #667eea;
            transform: translateX(5px);
        }
        .todo-item.completed {
            opacity: 0.6;
            text-decoration: line-through;
        }
        .todo-text { flex: 1; }
        .delete-btn {
            background: #ff4757;
            color: white;
            border: none;
            padding: 0.5rem 1rem;
            border-radius: 8px;
            cursor: pointer;
            font-size: 0.875rem;
        }
        .header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1rem;
        }
        .anycoder-link {
            color: #667eea;
            text-decoration: none;
            font-size: 0.875rem;
            font-weight: 500;
        }
        @media (max-width: 480px) {
            .container { padding: 1.5rem; }
            .input-section { flex-direction: column; }
            button { width: 100%; }
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="header">
            <h1>πŸ“ Todo App</h1>
            <a href="https://huggingface.co/spaces/akhaliq/anycoder" class="anycoder-link">Built with anycoder</a>
        </div>
        
        <div class="input-section">
            <input type="text" id="todoInput" placeholder="Add a new task..." maxlength="100">
            <button onclick="addTodo()">Add Task</button>
        </div>
        
        <div id="todoList"></div>
    </div>

    <script>
        let todos = JSON.parse(localStorage.getItem('todos')) || [];
        
        function renderTodos() {
            const todoList = document.getElementById('todoList');
            todoList.innerHTML = todos.map((todo, index) => `
                <div class="todo-item ${todo.completed ? 'completed' : ''}">
                    <span class="todo-text">${todo.text}</span>
                    <button onclick="toggleTodo(${index})">${todo.completed ? 'Undo' : 'Done'}</button>
                    <button class="delete-btn" onclick="deleteTodo(${index})">Delete</button>
                </div>
            `).join('');
            localStorage.setItem('todos', JSON.stringify(todos));
        }
        
        function addTodo() {
            const input = document.getElementById('todoInput');
            const text = input.value.trim();
            if (text) {
                todos.push({ text, completed: false });
                input.value = '';
                renderTodos();
            }
        }
        
        function toggleTodo(index) {
            todos[index].completed = !todos[index].completed;
            renderTodos();
        }
        
        function deleteTodo(index) {
            todos.splice(index, 1);
            renderTodos();
        }
        
        document.getElementById('todoInput').addEventListener('keypress', (e) => {
            if (e.key === 'Enter') addTodo();
        });
        
        renderTodos();
    </script>
</body>
</html>