Build a playable Asteroids game on a canvas: a thrust-and-rotate vector ship that shoots and wraps around screen edges, splitting asteroids into smaller pieces, with score and lives. Procedural vector graphics only, no external assets.

We need to build single-page web app and write it ALL into one self-contained file named index.html in current directory: CSS in <style> tag, JS in <script> tag, inline — do not create separate .css/.js files. Use NO external resources, CDNs or network requests: artifact runs fully sandboxed with no network. End with index.html present.

We need to create index.html with canvas game. Use bash to check current directory.

Let's do write file.

Create index.html. Implement Asteroids game.

Features: thrust-and-rotate vector ship, shoots, wraps around screen edges, splitting asteroids into smaller pieces, score and lives. Procedural vector graphics only.

Implement canvas full screen, maybe responsive. Ship with triangle. Rotation with left/right arrows, thrust up/W, shoot space. Wrap edges. Asteroids spawn random polygon with varying points. Collision detection circle approximated. Splitting: large -> medium -> small. Score increase. Lives 3. Game over screen.

No external resources.

Write file.

Make sure code is self-contained.

Use requestAnimationFrame loop.

Implement physics: velocity with friction/damping.

Ship: position x,y, angle, velocity vx,vy, thrust power, rotation speed. Wrap.

Bullets: lifetime.

Asteroids: array with size levels: 3 sizes. Each with vertices generated procedural. Rotation.

Procedural vector graphics: draw with canvas lineTo.

Add UI overlay for score, lives.

Controls: keyboard.

Make canvas resize.

Implement game states: playing, game over, start.

Simplify.

Let's write.

File written. Should verify exists.

Done.