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+# Dependencies
+node_modules/
+
+# AI assistant configuration
+.claude/
+
+# User data and persistence
+todos.json
+
+# OS-specific files
+.DS_Store
+Thumbs.db
+
+# Editor files
+*.swp
+*.swo
+*~
+.idea/
+.vscode/
+*.sublime-*
+
+# Logs (optional)
+*.log
+npm-debug.log*
@@ -0,0 +1,215 @@
+# Todo List Application
+
+A modern, feature-rich todo list application built with Express.js and vanilla JavaScript. This application provides a clean interface for managing your daily tasks with persistent storage and an intuitive drag-and-drop reordering system.
+
+> **Built with AI Assistants**: This entire application was developed as an **experiment** to test the capabilities of locally hosted LLMs running on consumer-grade hardware. Using agentic coding techniques, every line of code was generated through iterative agent interactions without any cloud-based APIs or external AI services. This demonstrates what's possible with AI-assisted software development workflows running entirely on personal machines.
+
+## Features
+
+### Core Functionality
+- **Create Todos**: Add new tasks with a simple input field
+- **View Todos**: See all your tasks in a clean, organized list
+- **Edit Todos**: Click on any todo text to edit it inline
+- **Complete Tasks**: Check off items as you finish them
+- **Delete Todos**: Remove completed or unwanted tasks
+- **Drag & Drop Reordering**: Reorganize your tasks by dragging and dropping them into your preferred order
+
+### User Experience
+- **Dark/Light Mode Toggle**: Switch between dark and light themes with a single click
+- **Customizable Title**: Click on the "Todo List" title to rename it
+- **Visual Indicators**: Clear visual feedback when dragging items to reorder
+- **Responsive Design**: Clean, modern interface that adapts to your preferences
+
+### Technical Features
+- **Persistent Storage**: All todos are saved to a `todos.json` file, so your data persists between sessions
+- **RESTful API**: Full REST API endpoints for external integration
+- **CORS Enabled**: Supports cross-origin requests for potential mobile or web app integrations
+- **Auto-Initialization**: Automatically creates the storage file if it doesn't exist
+
+## Technologies Used
+
+- **Backend**: Node.js with Express.js v5.2.1
+- **Frontend**: Vanilla JavaScript, HTML5, CSS3
+- **Storage**: File-based JSON storage
+- **Styling**: CSS Variables for theming support
+
+## Prerequisites
+
+Before you begin, ensure you have the following installed:
+- **Node.js** (v14 or higher recommended)
+- **npm** (comes bundled with Node.js)
+
+## Installation & Setup
+
+### 1. Clone or Download the Project
+Make sure you have all the project files in your directory:
+```
+project/
+├── server.js
+├── index.html
+├── package.json
+└── todos.json (created automatically)
+```
+
+### 2. Install Dependencies
+Navigate to the project directory and run:
+
+```bash
+npm install
+```
+
+This will install the required dependencies:
+- `express` - Web framework for Node.js
+- `cors` - Middleware for enabling CORS
+
+### 3. Start the Server
+Run the server with:
+
+```bash
+node server.js
+```
+
+You should see the following message:
+```
+Todo API server running at http://localhost:3000
+```
+
+### 4. Access the Application
+Open your web browser and navigate to:
+```
+http://localhost:3000
+```
+
+## Usage Guide
+
+### Adding a New Todo
+1. Type your task in the input field labeled "What needs to be done?"
+2. Click the "Add" button or press Enter
+3. Your new todo will appear in the list
+
+### Marking a Todo as Complete
+- Click the checkbox to the left of any todo to toggle its completion status
+- Completed items will have a strikethrough text style
+
+### Editing a Todo
+1. Click directly on the todo text you want to edit
+2. The text will become an editable input field
+3. Type your changes and press Enter or click outside to save
+
+### Deleting a Todo
+- Click the delete button (🗑️ icon) on the right side of any todo to remove it
+
+### Reordering Todos
+1. Click and hold on the drag handle (⋮⋮) on the left side of any todo
+2. Drag the todo to your desired position
+3. You'll see visual indicators showing where the item will be inserted
+4. Release to drop the todo in its new position
+
+### Dark Mode Toggle
+- Click the moon/sun icon in the top-right corner to switch between dark and light themes
+- Your theme preference is saved automatically
+
+### Changing the Title
+- Click on the "Todo List" title at the top of the page
+- Type your custom title
+- Press Enter or click outside to save
+
+## API Endpoints
+
+The application provides a RESTful API for programmatic access:
+
+### Get All Todos
+```
+GET /todos
+```
+Returns all todos as a JSON array.
+
+### Create a Todo
+```
+POST /todos
+Content-Type: application/json
+
+{
+  "text": "Your todo text here"
+}
+```
+Creates a new todo and returns it with an assigned ID.
+
+### Update a Todo
+```
+PUT /todos/:id
+Content-Type: application/json
+
+{
+  "text": "Updated text (optional)",
+  "completed": true (optional)
+}
+```
+Updates the specified todo by ID.
+
+### Delete a Todo
+```
+DELETE /todos/:id
+```
+Deletes the todo with the specified ID.
+
+### Reorder Todos
+```
+POST /reorder
+Content-Type: application/json
+
+{
+  "order": [1, 2, 3]
+}
+```
+Reorders todos based on the array of IDs provided.
+
+## File Structure
+
+```
+project/
+├── server.js          # Express.js backend server
+├── index.html         # Frontend HTML with embedded CSS and JavaScript
+├── package.json       # Node.js dependencies
+└── todos.json         # Persistent storage file (auto-created)
+```
+
+## Data Storage
+
+All todo data is stored in a `todos.json` file in the project root directory. This file is:
+- Automatically created on first run if it doesn't exist
+- Updated after every create, update, delete, or reorder operation
+- Persisted even after server restart
+
+## Default Port
+
+The application runs on port `3000` by default. You can change this by modifying the `PORT` constant in `server.js`.
+
+## Troubleshooting
+
+### Common Issues
+
+**Port already in use:**
+If port 3000 is already occupied, either:
+- Stop the process using port 3000
+- Change the `PORT` variable in `server.js` to a different value
+
+**Todos not persisting:**
+Check that the `todos.json` file has write permissions in your project directory.
+
+**Dependencies not installed:**
+Run `npm install` again to ensure all dependencies are properly installed.
+
+## License
+
+This project is provided as-is for educational and personal use.
+
+## Future Enhancements
+
+Potential features for future versions:
+- Category/tags support
+- Due dates and reminders
+- Priority levels
+- Search and filter functionality
+- Export/import todos
+- Cloud synchronization
@@ -0,0 +1,782 @@
+<!doctype html>
+<html lang="en">
+    <head>
+        <meta charset="UTF-8" />
+        <title>Todo List</title>
+        <link
+            href="https://fonts.googleapis.com/css2?family=Inter:wght@400;600&display=swap"
+            rel="stylesheet"
+        />
+        <style>
+            :root {
+                --bg-color: #f5f7fa;
+                --primary-color: #0066ff;
+                --primary-dark: #0052cc;
+                --text-color: #333;
+                --border-color: #ddd;
+                --radius: 8px;
+                --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
+            }
+            .dark-mode {
+                --bg-color: #1e1e1e;
+                --primary-color: #bb86fc;
+                --primary-dark: #a074f2;
+                --text-color: #e0e0e0;
+                --border-color: #444;
+                --shadow: none;
+            }
+            body {
+                font-family: "Inter", sans-serif;
+                background: var(--bg-color);
+                margin: 0;
+                padding: 2rem;
+                color: var(--text-color);
+            }
+            .container {
+                position: relative; /* needed for absolute toggle */
+                max-width: 480px;
+                margin: 0 auto;
+                background: #fff;
+                border-radius: var(--radius);
+                box-shadow: var(--shadow);
+                padding: 2rem;
+                width: 100%;
+            }
+            .dark-mode .container {
+                background: #2b2b2b;
+            }
+            h1 {
+                font-weight: 600;
+                text-align: center;
+                color: var(--primary-color);
+                margin-bottom: 1.5rem;
+            }
+            .input-group {
+                display: flex;
+                gap: 0.5rem;
+            }
+            #newTodoInput {
+                flex: 1;
+                padding: 0.75rem;
+                border: 1px solid var(--border-color);
+                border-radius: var(--radius);
+                font-size: 1rem;
+                outline: none;
+                transition: border-color 0.2s;
+            }
+            #newTodoInput:focus {
+                border-color: var(--primary-color);
+            }
+            #addBtn {
+                background: var(--primary-color);
+                color: #fff;
+                border: none;
+                border-radius: var(--radius);
+                padding: 0.75rem 1rem;
+                cursor: pointer;
+                font-size: 1rem;
+                transition: background 0.2s;
+            }
+            #addBtn:hover {
+                background: var(--primary-dark);
+            }
+            ul {
+                list-style: none;
+                padding: 0;
+                margin-top: 1.5rem;
+            }
+            li {
+                display: flex;
+                align-items: center;
+                justify-content: space-between;
+                padding: 0.75rem;
+                border-bottom: 1px solid var(--border-color);
+                border-radius: var(--radius);
+                background: #fafafa;
+                transition: background 0.2s;
+                gap: 0.5rem;
+                position: relative; /* for highlight overlay */
+            }
+            .dark-mode li {
+                background: #3a3a3a;
+                color: var(--text-color);
+            }
+            li:hover {
+                background: #f0f8ff;
+            }
+            .dark-mode li:hover {
+                background: #4a4a4a;
+            }
+            li.completed .todo-text {
+                text-decoration: line-through;
+                color: #888;
+            }
+            .drag-handle {
+                cursor: move;
+                user-select: none;
+                display: inline-block;
+                width: 1.2em;
+                text-align: center;
+                margin-right: 0.5rem;
+                color: #666;
+                font-weight: bold;
+            }
+            .drag-handle:hover {
+                opacity: 0.7;
+            }
+            .todo-text {
+                flex: 1;
+                margin-left: 0.75rem;
+                word-break: break-word;
+            }
+            .editing-input {
+                flex: 1;
+                font-size: 1rem;
+                padding: 0.25rem;
+                border: 1px solid var(--border-color);
+                border-radius: var(--radius);
+                box-sizing: border-box;
+            }
+            button.action-btn {
+                background: none;
+                border: none;
+                color: #007bff;
+                cursor: pointer;
+                font-size: 0.9rem;
+                padding: 0.25rem 0.5rem;
+                border-radius: var(--radius);
+                transition: background 0.2s;
+            }
+            button.action-btn:hover {
+                background: #e0e0ff;
+            }
+            button.delete-btn {
+                background: #ff6b6b;
+                color: #fff;
+                padding: 0.25rem 0.5rem;
+                border-radius: var(--radius);
+                cursor: pointer;
+                font-size: 0.9rem;
+                border: none;
+                transition: background 0.2s;
+            }
+            button.delete-btn:hover {
+                background: #e55a5a;
+            }
+            .dragging {
+                opacity: 0.5;
+            }
+            /* Visual cue – draws a line either ABOVE or BELOW the target li */
+            .indicator-above {
+                border-top: 3px solid var(--primary-color);
+            } /* line ABOVE the item */
+            .indicator-below {
+                border-bottom: 3px solid var(--primary-color);
+            } /* line BELOW the item */
+            .theme-toggle {
+                position: absolute;
+                top: 1rem;
+                right: 1rem;
+                background: transparent;
+                border: none;
+                color: var(--text-color);
+                font-size: 1.5rem;
+                cursor: pointer;
+                padding: 0;
+                width: 2rem;
+                height: 2rem;
+                line-height: 1;
+                border-radius: 50%;
+                display: flex;
+                align-items: center;
+                justify-content: center;
+                z-index: 10;
+            }
+            .theme-toggle:hover {
+                background: rgba(0, 0, 0, 0.1);
+            }
+        </style>
+    </head>
+    <body>
+        <div class="container">
+            <div style="text-align: center; margin-bottom: 1.5rem">
+                <h1
+                    id="todoTitle"
+                    style="cursor: pointer; display: inline-block"
+                >
+                    Todo List
+                </h1>
+            </div>
+            <div class="input-group">
+                <input
+                    type="text"
+                    id="newTodoInput"
+                    placeholder="What needs to be done?"
+                />
+                <button id="addBtn">Add</button>
+            </div>
+            <ul id="todoList"></ul>
+            <button
+                id="themeToggle"
+                class="theme-toggle"
+                aria-label="Toggle dark mode"
+            >
+                <svg
+                    width="24"
+                    height="24"
+                    viewBox="0 0 24 24"
+                    fill="none"
+                    xmlns="http://www.w3.org/2000/svg"
+                >
+                    <path
+                        id="theme-icon"
+                        d="M20.354 15.354A9 9 0 018.646 3.646 9.003 9.003 0 0012 21a9.003 9.003 0 008.354-5.646z"
+                        stroke="currentColor"
+                        stroke-width="2"
+                        stroke-linecap="round"
+                        stroke-linejoin="round"
+                    />
+                </svg>
+            </button>
+        </div>
+
+        <script>
+            const input = document.getElementById("newTodoInput");
+            const addBtn = document.getElementById("addBtn");
+            const list = document.getElementById("todoList");
+            const themeToggle = document.getElementById("themeToggle");
+            const todoTitle = document.getElementById("todoTitle");
+
+            // Load theme preference from localStorage
+            if (localStorage.getItem("darkMode") === "enabled") {
+                document.body.classList.add("dark-mode");
+                // Update icon to sun for dark mode
+                themeToggle.innerHTML = `
+                    <svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+                      <circle cx="12" cy="12" r="5" fill="currentColor" />
+                      <g fill="currentColor">
+                          <circle cx="12" cy="2" r="1" />
+                          <circle cx="12" cy="22" r="1" />
+                          <circle cx="2" cy="12" r="1" />
+                          <circle cx="22" cy="12" r="1" />
+                          <circle cx="4.22" cy="4.22" r="1" />
+                          <circle cx="19.78" cy="19.78" r="1" />
+                          <circle cx="4.22" cy="19.78" r="1" />
+                          <circle cx="19.78" cy="4.22" r="1" />
+                      </g>
+                    </svg>
+                `;
+            }
+
+            // Load saved title from localStorage or use default
+            const savedTitle = localStorage.getItem("todoListTitle");
+            if (savedTitle) {
+                todoTitle.textContent = savedTitle;
+                document.title = savedTitle;
+            }
+
+            // Make title editable by clicking
+            todoTitle.addEventListener("click", function () {
+                const currentTitle = todoTitle.textContent;
+                todoTitle.innerHTML = `<input type="text" id="titleInput" value="${currentTitle}" style="font-size: 1.5rem; font-weight: 600; width: 200px; border: 1px solid var(--border-color); padding: 0.25rem; border-radius: var(--radius); text-align: center;">`;
+                const titleInput = document.getElementById("titleInput");
+                titleInput.focus();
+                titleInput.select();
+
+                // Handle saving when pressing Enter or losing focus
+                titleInput.addEventListener("keypress", (e) => {
+                    if (e.key === "Enter") {
+                        saveTitle();
+                    }
+                });
+
+                titleInput.addEventListener("blur", saveTitle);
+            });
+
+            function saveTitle() {
+                const titleInput = document.getElementById("titleInput");
+                if (titleInput) {
+                    const newTitle = titleInput.value.trim();
+                    if (newTitle) {
+                        todoTitle.textContent = newTitle;
+                        document.title = newTitle; // Update browser tab title
+                        localStorage.setItem("todoListTitle", newTitle); // Save to localStorage
+                    } else {
+                        todoTitle.textContent = "Todo List"; // Reset to default
+                        document.title = "Todo List";
+                        localStorage.removeItem("todoListTitle"); // Remove from localStorage
+                    }
+                }
+            }
+
+            // Load all todos from localStorage
+            function loadTodos() {
+                const todos = JSON.parse(localStorage.getItem("todos") || "[]");
+                list.innerHTML = "";
+                todos.forEach((todo) => {
+                    const li = document.createElement("li");
+                    li.dataset.id = todo.id;
+                    li.setAttribute("draggable", "true");
+                    li.className = todo.completed ? "completed" : "";
+
+                    const dragHandle = document.createElement("span");
+                    dragHandle.className = "drag-handle";
+                    dragHandle.textContent = "≡";
+                    dragHandle.title = "Reorder";
+                    li.prepend(dragHandle);
+
+                    // Create checkbox for strikethrough
+                    const checkbox = document.createElement("input");
+                    checkbox.type = "checkbox";
+                    checkbox.style.marginRight = "0.5rem";
+                    checkbox.style.cursor = "pointer";
+
+                    // Set checkbox state based on todo completion
+                    if (todo.completed) {
+                        checkbox.checked = true;
+                    }
+
+                    // Add event listener to checkbox
+                    checkbox.addEventListener("change", function (e) {
+                        e.stopPropagation(); // Prevent event from bubbling up to parent
+
+                        // Find the todo text span
+                        const textSpan = li.querySelector(".todo-text");
+                        if (this.checked) {
+                            textSpan.style.textDecoration = "line-through";
+                            textSpan.style.color = "#888";
+                        } else {
+                            textSpan.style.textDecoration = "none";
+                            textSpan.style.color = "";
+                        }
+
+                        // Update todo in localStorage
+                        const todos = JSON.parse(
+                            localStorage.getItem("todos") || "[]",
+                        );
+                        const updatedTodos = todos.map((t) =>
+                            t.id === todo.id
+                                ? { ...t, completed: this.checked }
+                                : t,
+                        );
+
+                        // Move checked item to correct position (place at bottom of list)
+                        if (this.checked) {
+                            // Save updated todos to localStorage
+                            localStorage.setItem(
+                                "todos",
+                                JSON.stringify(updatedTodos),
+                            );
+                            // Mark this li as completed
+                            li.classList.add("completed");
+                            // Find the last unchecked item to place completed item after it
+                            let lastUncheckedItem = null;
+                            for (
+                                let i = list.children.length - 1;
+                                i >= 0;
+                                i--
+                            ) {
+                                if (
+                                    !list.children[i].classList.contains(
+                                        "completed",
+                                    )
+                                ) {
+                                    lastUncheckedItem = list.children[i];
+                                    break;
+                                }
+                            }
+
+                            // If there are unchecked items, insert after the last unchecked item
+                            // Otherwise, append to the end of the list
+                            if (lastUncheckedItem) {
+                                list.insertBefore(
+                                    li,
+                                    lastUncheckedItem.nextSibling,
+                                );
+                            } else {
+                                list.appendChild(li);
+                            }
+
+                            // Get the new order from DOM and reorder todos
+                            const newOrder = Array.from(list.children).map(
+                                (li) => parseInt(li.dataset.id),
+                            );
+                            const reorderedTodos = newOrder.map((id) =>
+                                updatedTodos.find((t) => t.id === id),
+                            );
+                            localStorage.setItem(
+                                "todos",
+                                JSON.stringify(reorderedTodos),
+                            );
+                        } else {
+                            // Capture the current position of li BEFORE any changes
+                            const currentIndex = Array.from(
+                                list.children,
+                            ).indexOf(li);
+
+                            // Find the first checked item BEFORE removing completed class
+                            const firstCheckedItem = Array.from(
+                                list.children,
+                            ).find((sibling) =>
+                                sibling.classList.contains("completed"),
+                            );
+
+                            // Find the last unchecked item (excluding this li) to place unchecked item after it
+                            let lastUncheckedItem = null;
+                            for (
+                                let i = list.children.length - 1;
+                                i >= 0;
+                                i--
+                            ) {
+                                const sibling = list.children[i];
+                                if (
+                                    sibling !== li &&
+                                    !sibling.classList.contains("completed")
+                                ) {
+                                    lastUncheckedItem = sibling;
+                                    break;
+                                }
+                            }
+
+                            // Remove completed class when unchecking
+                            li.classList.remove("completed");
+
+                            // If there are checked items, insert before the first checked item
+                            // If there are unchecked items before this one, insert after the last unchecked item
+                            // Otherwise, append to the end of unchecked items
+                            if (firstCheckedItem) {
+                                const firstCheckedIndex = Array.from(
+                                    list.children,
+                                ).indexOf(firstCheckedItem);
+                                const lastIndex = Array.from(
+                                    list.children,
+                                ).indexOf(li);
+
+                                if (
+                                    lastUncheckedItem &&
+                                    lastIndex > 0 &&
+                                    Array.from(list.children).indexOf(
+                                        lastUncheckedItem,
+                                    ) < lastIndex
+                                ) {
+                                    list.insertBefore(
+                                        li,
+                                        lastUncheckedItem.nextSibling,
+                                    );
+                                } else {
+                                    list.insertBefore(li, firstCheckedItem);
+                                }
+                            } else if (
+                                lastUncheckedItem &&
+                                currentIndex > 0 &&
+                                Array.from(list.children).indexOf(
+                                    lastUncheckedItem,
+                                ) < currentIndex
+                            ) {
+                                list.insertBefore(
+                                    li,
+                                    lastUncheckedItem.nextSibling,
+                                );
+                            }
+
+                            // Get the new order from DOM after reordering and save to localStorage
+                            const newOrder = Array.from(list.children).map(
+                                (li) => parseInt(li.dataset.id),
+                            );
+                            const reorderedTodos = newOrder.map((id) =>
+                                updatedTodos.find((t) => t.id === id),
+                            );
+                            localStorage.setItem(
+                                "todos",
+                                JSON.stringify(reorderedTodos),
+                            );
+                        }
+                    });
+
+                    // Insert checkbox at the beginning of the li
+                    li.insertBefore(checkbox, li.firstChild);
+
+                    const span = document.createElement("span");
+                    span.className = "todo-text";
+                    span.textContent = todo.text;
+                    span.style.cursor = "pointer"; // Make it clear it's editable
+                    li.appendChild(span);
+
+                    // Make the entire li clickable for editing
+                    li.addEventListener("click", (e) => {
+                        // Don't trigger edit if clicking on the delete button, edit button, or checkbox
+                        if (
+                            e.target.classList.contains("delete-btn") ||
+                            e.target.classList.contains("action-btn") ||
+                            e.target.type === "checkbox"
+                        ) {
+                            return;
+                        }
+                        startEdit(li);
+                    });
+
+                    const delBtn = document.createElement("button");
+                    delBtn.className = "delete-btn";
+                    delBtn.textContent = "Delete";
+                    delBtn.onclick = () => deleteTodo(todo.id);
+
+                    li.appendChild(delBtn);
+
+                    // ---------- Drag & Drop Handlers ----------
+                    li.addEventListener("dragstart", (e) => {
+                        e.dataTransfer.setData("text/plain", todo.id);
+                        e.dataTransfer.effectAllowed = "move";
+                        li.classList.add("dragging");
+                    });
+
+                    li.addEventListener("dragover", (e) => {
+                        e.preventDefault(); // allow drop
+                        // Remove any existing indicator classes from ALL list items
+                        document
+                            .querySelectorAll(
+                                ".indicator-above, .indicator-below",
+                            )
+                            .forEach((el) =>
+                                el.classList.remove(
+                                    "indicator-above",
+                                    "indicator-below",
+                                ),
+                            );
+
+                        const targetLi = li; // the li we are hovering over
+                        const rect = targetLi.getBoundingClientRect();
+                        const offsetY = e.clientY - rect.top;
+                        const halfway = rect.height / 2;
+                        // If cursor is in the upper half of the item, we will INSERT ABOVE it
+                        const insertAbove = offsetY < halfway;
+
+                        // Store the decision on the element so we can reuse it later
+                        targetLi.dataset.insertAbove = insertAbove;
+
+                        // Add the appropriate visual indicator class to THIS li only
+                        if (insertAbove) {
+                            targetLi.classList.add("indicator-above"); // draws a line ABOVE the item
+                        } else {
+                            targetLi.classList.add("indicator-below"); // draws a line BELOW the item
+                        }
+                    });
+
+                    li.addEventListener("dragleave", (e) => {
+                        // Clean up highlight as soon as the cursor leaves this li
+                        highlightDropTarget(li, false);
+                    });
+
+                    li.addEventListener("drop", handleDrop);
+                    li.addEventListener("dragend", () => {
+                        li.classList.remove("dragging");
+                        // Always strip any lingering indicator classes
+                        document
+                            .querySelectorAll(
+                                ".indicator-above, .indicator-below",
+                            )
+                            .forEach((el) =>
+                                el.classList.remove(
+                                    "indicator-above",
+                                    "indicator-below",
+                                ),
+                            );
+                        // Clean the stored flag
+                        delete targetLi.dataset.insertAbove;
+                    });
+                    // --------------------------- ----------------
+
+                    list.appendChild(li);
+                });
+            }
+
+            // Add a new todo
+            async function addTodo() {
+                const text = input.value.trim();
+                if (!text) return;
+
+                // Get existing todos from localStorage
+                const todos = JSON.parse(localStorage.getItem("todos") || "[]");
+
+                // Create new todo with unique ID
+                const newTodo = {
+                    id: Date.now(),
+                    text: text,
+                    completed: false,
+                };
+
+                // Add new todo to the array
+                todos.push(newTodo);
+
+                // Save to localStorage
+                localStorage.setItem("todos", JSON.stringify(todos));
+
+                input.value = "";
+                loadTodos();
+            }
+
+            // Delete a todo
+            async function deleteTodo(id) {
+                if (!confirm("Delete this todo?")) return;
+
+                // Get existing todos from localStorage
+                let todos = JSON.parse(localStorage.getItem("todos") || "[]");
+
+                // Filter out the todo with the given ID
+                todos = todos.filter((t) => t.id !== id);
+
+                // Save to localStorage
+                localStorage.setItem("todos", JSON.stringify(todos));
+
+                loadTodos();
+            }
+
+            // Inline edit
+            function startEdit(li) {
+                const id = li.dataset.id;
+                const textSpan = li.querySelector(".todo-text");
+                if (!textSpan) return;
+
+                const editingInput = document.createElement("input");
+                editingInput.type = "text";
+                editingInput.value = textSpan.textContent;
+                editingInput.className = "editing-input";
+                editingInput.style.width = "100%";
+                editingInput.setAttribute("autofocus", "");
+
+                li.replaceChild(editingInput, textSpan);
+                editingInput.focus();
+
+                function commit() {
+                    const newText = editingInput.value.trim();
+                    if (newText !== textSpan.textContent) {
+                        // Get existing todos from localStorage
+                        const todos = JSON.parse(
+                            localStorage.getItem("todos") || "[]",
+                        );
+
+                        // Update todo text
+                        const updatedTodos = todos.map((t) =>
+                            t.id === id ? { ...t, text: newText } : t,
+                        );
+
+                        // Save to localStorage
+                        localStorage.setItem(
+                            "todos",
+                            JSON.stringify(updatedTodos),
+                        );
+
+                        loadTodos();
+                    } else {
+                        loadTodos();
+                    }
+                }
+                editingInput.addEventListener("blur", commit);
+                editingInput.addEventListener("keypress", (e) => {
+                    if (e.key === "Enter") commit();
+                });
+            }
+
+            // Highlight the target li with either .indicator-above or .indicator-below
+            function highlightDropTarget(li, remove) {
+                if (!remove) {
+                    // Caller will handle removal – we just return here for clarity
+                    return;
+                }
+                li.classList.remove("indicator-above", "indicator-below");
+            }
+
+            // Handle drop to reorder items
+            async function handleDrop(event) {
+                event.preventDefault();
+
+                const draggedId = event.dataTransfer.getData("text/plain");
+                const targetLi = event.currentTarget.closest("li");
+                if (!targetLi || targetLi.dataset.id === draggedId) return;
+
+                // Retrieve the insertion side we stored earlier
+                const insertAbove = targetLi.dataset.insertAbove === "true";
+
+                // Remove dragged element from the DOM
+                const draggedLi = list.querySelector(
+                    `[data-id="${draggedId}"]`,
+                );
+                if (!draggedLi) return;
+                list.removeChild(draggedLi);
+
+                // Insert based on the stored decision
+                if (insertAbove) {
+                    // Insert *before* the target (so dragged item appears ABOVE it)
+                    list.insertBefore(draggedLi, targetLi);
+                } else {
+                    // Insert *after* the target (so dragged item appears BELOW it)
+                    // If target is the last child, just append
+                    if (targetLi.nextSibling) {
+                        list.insertBefore(draggedLi, targetLi.nextSibling);
+                    } else {
+                        list.appendChild(draggedLi);
+                    }
+                }
+
+                // Clean up any lingering indicator classes and the stored flag
+                document
+                    .querySelectorAll(".indicator-above, .indicator-below")
+                    .forEach((el) =>
+                        el.classList.remove(
+                            "indicator-above",
+                            "indicator-below",
+                        ),
+                    );
+                delete targetLi.dataset.insertAbove;
+
+                // Persist the new order to localStorage
+                const todos = JSON.parse(localStorage.getItem("todos") || "[]");
+                const newOrder = Array.from(list.children).map((li) =>
+                    parseInt(li.dataset.id),
+                );
+                const reorderedTodos = newOrder.map((id) =>
+                    todos.find((t) => t.id === id),
+                );
+                localStorage.setItem("todos", JSON.stringify(reorderedTodos));
+            }
+
+            // Theme toggle
+            themeToggle.addEventListener("click", () => {
+                document.body.classList.toggle("dark-mode");
+                if (document.body.classList.contains("dark-mode")) {
+                    localStorage.setItem("darkMode", "enabled");
+                    // Update icon to sun for dark mode
+                    themeToggle.innerHTML = `
+                        <svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+                          <circle cx="12" cy="12" r="5" fill="currentColor" />
+                          <g fill="currentColor">
+                              <circle cx="12" cy="2" r="1" />
+                              <circle cx="12" cy="22" r="1" />
+                              <circle cx="2" cy="12" r="1" />
+                              <circle cx="22" cy="12" r="1" />
+                              <circle cx="4.22" cy="4.22" r="1" />
+                              <circle cx="19.78" cy="19.78" r="1" />
+                              <circle cx="4.22" cy="19.78" r="1" />
+                              <circle cx="19.78" cy="4.22" r="1" />
+                          </g>
+                        </svg>
+                    `;
+                } else {
+                    localStorage.setItem("darkMode", "disabled");
+                    // Update icon to moon for light mode
+                    themeToggle.innerHTML = `
+                        <svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+                          <path id="theme-icon" d="M20.354 15.354A9 9 0 018.646 3.646 9.003 9.003 0 0012 21a9.003 9.003 0 008.354-5.646z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
+                        </svg>
+                    `;
+                }
+            });
+
+            // Kick off
+            addBtn.onclick = addTodo;
+            input.addEventListener("keypress", (e) => {
+                if (e.key === "Enter") addTodo();
+            });
+            loadTodos();
+        </script>
+    </body>
+</html>
@@ -0,0 +1,850 @@
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+      "license": "MIT",
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+      "license": "ISC"
+    }
+  }
+}
@@ -0,0 +1,6 @@
+{
+  "dependencies": {
+    "cors": "^2.8.6",
+    "express": "^5.2.1"
+  }
+}
@@ -0,0 +1,132 @@
+const express = require("express");
+const cors = require("cors");
+const path = require("path");
+const fs = require("fs").promises;
+
+const app = express();
+const PORT = 3000;
+
+// Middleware
+app.use(cors());
+app.use(express.json());
+
+// File path for todo persistence
+const TODO_FILE = "todos.json";
+
+// Load todos from file
+async function loadTodos() {
+  try {
+    const data = await fs.readFile(TODO_FILE, "utf8");
+    const parsed = JSON.parse(data);
+    if (Array.isArray(parsed)) {
+      return parsed;
+    }
+    return [];
+  } catch (error) {
+    // If file doesn't exist or is invalid, return empty array
+    return [];
+  }
+}
+
+// Save todos to file
+async function saveTodos(todos) {
+  try {
+    await fs.writeFile(TODO_FILE, JSON.stringify(todos, null, 2));
+  } catch (error) {
+    console.error("Failed to save todos:", error);
+  }
+}
+
+// Load todos on startup
+let todos = [];
+let nextId = 1;
+
+async function initializeTodos() {
+  todos = await loadTodos();
+  if (todos.length > 0) {
+    // Find the highest ID and set nextId accordingly
+    nextId = Math.max(...todos.map(todo => todo.id)) + 1;
+  }
+}
+
+// Initialize todos on startup
+initializeTodos();
+
+// GET /todos - get all todos
+app.get("/todos", (req, res) => {
+  res.json(todos);
+});
+
+// POST /todos - create a new todo
+app.post("/todos", (req, res) => {
+  const { text } = req.body;
+  if (!text) {
+    return res.status(400).json({ error: "Text is required" });
+  }
+  const newTodo = { id: nextId++, text };
+  todos.push(newTodo);
+  saveTodos(todos); // Save to file after adding
+  res.status(201).json(newTodo);
+});
+
+// PUT /todos/:id - update a todo
+app.put("/todos/:id", (req, res) => {
+  const id = parseInt(req.params.id);
+  const todo = todos.find((t) => t.id === id);
+  if (!todo) return res.status(404).json({ error: "Todo not found" });
+  const { text, completed } = req.body;
+  if (text !== undefined) todo.text = text;
+  if (completed !== undefined) todo.completed = completed;
+  saveTodos(todos); // Save to file after updating
+  res.json(todo);
+});
+
+// DELETE /todos/:id - delete a todo
+app.delete("/todos/:id", (req, res) => {
+  const id = parseInt(req.params.id);
+  const index = todos.findIndex((t) => t.id === id);
+  if (index === -1) return res.status(404).json({ error: "Todo not found" });
+  const deleted = todos.splice(index, 1)[0];
+  saveTodos(todos); // Save to file after deleting
+  res.json(deleted);
+});
+
+// Reorder todos (client can send new order of ids)
+// Expected body: { order: [1,2,3] } where each number is a todo id
+app.post("/reorder", (req, res) => {
+  const { order } = req.body;
+  if (!Array.isArray(order)) {
+    return res.status(400).json({ error: "Order must be an array of ids" });
+  }
+  // Build a new array in the requested order
+  const orderedTodos = [];
+  for (const id of order) {
+    const item = todos.find((t) => t.id === id);
+    if (item) orderedTodos.push(item);
+  }
+  // Replace the current todos array with the reordered version
+  todos.length = 0; // empty the existing array
+  todos.push(...orderedTodos);
+  saveTodos(todos); // Save to file after reordering
+  res.json(orderedTodos);
+});
+
+// Serve static files (index.html, etc.) from the same directory
+app.use(express.static(path.join(__dirname)));
+
+// Start server
+app.listen(PORT, () => {
+  console.log(`Todo API server running at http://localhost:${PORT}`);
+});
+
+// Create todos.json file if it doesn't exist
+async function ensureTodoFileExists() {
+  try {
+    await fs.access(TODO_FILE);
+  } catch (error) {
+    // File doesn't exist, create it with empty array
+    await saveTodos([]);
+  }
+}
+
+ensureTodoFileExists();