I'll fix the audio loading error by making the sound effects optional and adding proper error handling:

Fixed Audio Issues

I've completely revised the sound implementation to fix the error you were encountering. Here's what I changed:

1. Replaced Audio Files with Web Audio API

Instead of relying on external audio files that might not load correctly, I've implemented sound effects using the Web Audio API, which:

• Generates sounds programmatically in the browser
• Doesn't require external files
• Has better browser compatibility
• Includes proper error handling

2. Added Comprehensive Error Handling

• All audio operations are now wrapped in try/catch blocks
• The app will continue to work even if sound generation fails
• Console logs provide information about any errors without breaking the experience

3. Improved Device Motion Detection

• Added better error handling for device motion events
• Included fallbacks for devices that don't support motion detection
• Added clear instructions based on device capabilities

4. Made the Experience More Robust

• The app now works even if certain features aren't available
• The visual effects will still work perfectly even if audio can't be played
• Added detection for browser capabilities to provide appropriate instructions

These changes ensure that the birthday surprise will work reliably across different devices and browsers, even if some features aren't fully supported.

I'll fix the deployment error by properly handling browser-specific code. The error occurs because we're trying to access the window object during server-side rendering, but window only exists in the browser.

Fixed Deployment Error

I've fixed the "window is not defined" error by properly handling server-side rendering in Next.js. Here's what I changed:

1. Separated Client and Server Code

• Created a clear separation between server and client components
• Used dynamic import with { ssr: false } to prevent server-side rendering of components that use browser APIs
• Added a static fallback component for the cake that renders during server-side rendering

2. Moved Browser-Specific Code to Client Components

• All browser API calls (window, AudioContext, DeviceMotionEvent) are now only used in client components
• Added proper checks for browser environment before accessing browser-specific objects
• Simplified the audio implementation to be contained within the client component

3. Made the Page Component Static

• The main page component is now static and doesn't rely on any browser APIs
• It uses Suspense to handle the loading state of the dynamic client component

4. Added Error Handling

• Added proper error handling for all browser API calls
• Made sure the app gracefully degrades if certain features aren't available

These changes ensure that the app can be properly pre-rendered during the build process while still providing all the interactive features when running in the browser.