I need to create a single-page web app with a tile-based platformer game in the style of Dangerous Dave. Let me break down the requirements:

1. Single file: index.html with inline CSS and JavaScript
2. Canvas-based game
3. Tile-based platformer
4. Game mechanics:
   - Navigate a level
   - Grab a trophy
   - Reach the exit
   - Avoid hazards (fire, water)
   - Jumping mechanics
   - Simple enemies
5. Procedural graphics only (no external assets)

I'll create a complete game with:
- Player character with movement and jumping
- Tile-based level system
- Collectible trophy
- Exit door
- Hazards (fire, water)
- Simple enemy AI
- Collision detection
- Game states (playing, won, lost)
- Procedurally drawn sprites

Let me structure this properly:
1. HTML structure with canvas
2. CSS for styling
3. JavaScript for game logic including:
   - Game initialization
   - Level data
   - Player class
   - Enemy class
   - Rendering system
   - Input handling
   - Collision detection
   - Game loop

I've successfully created a complete Dangerous Dave style platformer game in a single HTML file. Let me verify what I've implemented:

✅ Single self-contained HTML file with inline CSS and JavaScript
✅ Canvas-based tile-based platformer
✅ Player character with movement (arrow keys) and jumping (space)
✅ Level with various tile types:
  - Solid platforms (brick pattern)
  - Water hazards (with animated waves)
  - Fire hazards (with animated flames)
  - Collectible trophy (golden cup)
  - Exit door (turns green when trophy is collected)
✅ Simple enemies that patrol back and forth
✅ Collision detection for platforms, hazards, enemies, trophy, and exit
✅ Game mechanics:
  - Gravity and physics
  - Win condition: collect trophy then reach exit
  - Lose condition: touch hazards or enemies
✅ Procedural graphics only - all sprites drawn with canvas API
✅ Visual feedback and game state management

The game should be fully playable and follows the Dangerous Dave style gameplay pattern. The player needs to navigate the level, avoid hazards and enemies, collect the trophy, and then reach the exit to win.