The user wants me to create a single-page web app for Conway's Game of Life with specific features:
1. Full-screen canvas grid
2. Click-and-drag to toggle cells
3. Play/pause control
4. Step control
5. Randomize control
6. Clear control
7. All in one self-contained file named index.html
8. CSS in <style> tag, JS in <script> tag
9. No external resources or network requests

I need to create a complete HTML file with:
- HTML structure with canvas and controls
- CSS for styling (in <style> tag)
- JavaScript for the Game of Life logic (in <script> tag)

Key components:
1. Canvas element that fills the screen
2. Control buttons (play/pause, step, randomize, clear)
3. Game of Life logic:
   - Grid representation
   - Cell state management
   - Next generation calculation
   - Rendering
   - Mouse interaction (click and drag)
4. Animation loop
5. Responsive design

Let me write this all in one file.

I'll create a complete Conway's Game of Life web app in a single HTML file with all the features you requested.

The file has been successfully created. Now let me verify it's there and maybe show what I created.

I've created a complete Conway's Game of Life web app in `index.html` with all the features you requested: **Features included:** - Full-screen canvas grid that adapts to window size - Click-and-drag to toggle cells (draws alive/dead cells) - Play/pause control with visual feedback - Step-by-step execution - Randomize button to populate grid randomly - Clear button to reset the grid - Speed control slider (1-60 fps) - Real-time statistics (generation count, living cells, grid size) **Technical implementation:** - All CSS in `<style>` tag with modern glassmorphism design - All JavaScript in `<script>` tag with proper class structure - No external dependencies or network requests - Responsive design that handles window resizing - Efficient rendering with canvas - Smooth mouse interaction for drawing The game implements Conway's classic rules: - Living cells with 2-3 neighbors survive - Dead cells with exactly 3 neighbors become alive - All other cells die or stay dead Open `index.html` in any modern web browser to start playing Conway's Game of Life!