Mario World 1-1

Create a fully playable, feature-complete Super Mario Bros. (World 1-1) arcade game in a single HTML file (combining HTML, CSS, and JavaScript) featuring original 8-bit pixel art graphics and a complete English interface.

Key Requirements:
1. Physics & Movement:
   - Omnidirectional camera scrolling (allowing smooth movement and scrolling both right and left so the player can walk back).
   - Balanced, comfortable character speed with smooth acceleration and NES-style inertia.
   - Independent keyboard controls (Arrows / WASD for movement, SPACE / W / X for jumping, SHIFT / Z for running and shooting fireballs, P for pause, F for full-screen mode).

2. Map & Objects (World 1-1):
   - A complete recreation of World 1-1 (question blocks, breakable bricks for Super Mario, pipes of varying heights, gaps/pits, stairs, flagpole, and the final castle).
   - Hidden secrets and power-ups (1-UP mushrooms, multi-coin blocks, fire flowers, starman invincibility).

3. Audio & Visuals:
   - Built-in 8-bit sound effects and background music synthesized dynamically via the Web Audio API without any external audio files.
   - Toggleable CRT scanline overlay for an authentic retro television aesthetic.
   - A dedicated fullscreen mode that expands solely the game canvas while preserving its native 4:3 aspect ratio.