I'll create a mobile-first PiPixel app for AI photo enhancement with Pi payment integration. This will be a responsive web app optimized for mobile devices.

I've created a comprehensive mobile-first PiPixel app with the following features:

Key Features:

1. Mobile-First Design: Optimized for touch interactions with large buttons and responsive layouts
2. Photo Upload: Drag & drop or tap to select photos with camera option
3. AI Enhancement Preview: Real-time preview with adjustable enhancement levels
4. Pi Payment Integration: Secure payment modal for HD downloads
5. Progressive Enhancement: Free preview → Pay for HD quality

Mobile Optimizations:

• Touch-friendly UI with large tap targets
• Responsive grid layouts that adapt to screen sizes
• Sticky navigation for easy access
• Gradient backgrounds for modern mobile aesthetics
• Smooth animations and transitions
• Backdrop blur effects for depth

User Flow:

1. Landing Page: Hero section with clear value proposition
2. Photo Upload: Simple drag & drop or file selection
3. Enhancement: AI processing with adjustable intensity slider
4. Preview: Side-by-side comparison of original vs enhanced
5. Payment: Pi Network integration for HD downloads

Technical Highlights:

• Next.js App Router with TypeScript
• Tailwind CSS for responsive styling
• shadcn/ui components for consistent design
• Lucide React icons for crisp mobile icons
• Simulated AI processing with loading states
• Modal-based payment flow

The app is fully responsive and provides an excellent mobile experience with smooth interactions, clear visual hierarchy, and intuitive navigation. Users can easily upload photos, preview AI enhancements for free, and purchase HD downloads using Pi cryptocurrency.