index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Advanced Todo App</title>
    <link rel="stylesheet" href="style.css">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/css/all.min.css">
</head>
<body>
    <div class="app-container">
        <header>
            <h1>Advanced Todo App</h1>
        </header>
        <main>
            <section class="input-section">
                <input type="text" id="new-todo" placeholder="Enter new todo item">
                <input type="date" id="due-date">
                <select id="priority">
                    <option value="low">Low</option>
                    <option value="medium">Medium</option>
                    <option value="high">High</option>
                </select>
                <button id="add-todo-btn"><i class="fas fa-plus"></i> Add</button>
            </section>
            <section class="filters">
                <button id="filter-all" class="active">All</button>
                <button id="filter-active">Active</button>
                <button id="filter-completed">Completed</button>
                <select id="sort-by">
                    <option value="date-added">Date Added</option>
                    <option value="due-date">Due Date</option>
                    <option value="priority">Priority</option>
                </select>
            </section>
            <section class="todo-list">
                <ul id="todo-list"></ul>
            </section>
        </main>
        <footer>
            <button id="clear-completed-btn">Clear Completed</button>
            <p id="todo-count">0 items left</p>
        </footer>
    </div>
    <script src="script.js"></script>
</body>
</html>