Next.js Frontend Development

Next.js Frontend Development

When to Use This Skill

Activate this skill when working on frontend tasks in packages/​nextjs/:

• Creating or modifying React components
• Styling with Tailwind CSS
• Building new pages or layouts
• Implementing animations and interactions
• Working with UI/​UX improvements

Project Context

SplitHub is a tap-to-pay bill splitting app. The frontend should feel:

• Instant & Responsive — NFC tap interactions need snappy feedback
• Trustworthy — Financial app requires clean, confident design
• Effortless — Hide complexity, make payments feel magical

Aesthetic Guidelines

Avoid "AI Slop"

Generic AI-generated designs are immediately recognizable. Avoid:

• Overused fonts: Inter, Roboto, Open Sans, Lato, system fonts
• Cliché color schemes: purple gradients on white backgrounds
• Predictable layouts and cookie-cutter component patterns
• Space Grotesk (overused in AI outputs)

Make creative, distinctive choices that surprise and delight.

Typography

Typography signals quality instantly. Use distinctive fonts from Google Fonts.

Good choices:

• Code aesthetic: JetBrains Mono, Fira Code
• Editorial: Playfair Display, Crimson Pro
• Technical: IBM Plex family, Source Sans 3
• Distinctive: Bricolage Grotesque, Newsreader, Syne, Outfit, Archivo

Pairing principles:

• High contrast = interesting (display + monospace, serif + geometric sans)
• Use weight extremes: 100/​200 vs 800/​900, not 400 vs 600
• Size jumps of 3x+, not 1.5x

Load fonts via next/​font/​google in layout files.

Color & Theme

• Commit to a cohesive aesthetic with CSS variables
• Dominant colors with sharp accents > timid, evenly-distributed palettes
• Draw inspiration from IDE themes, cultural aesthetics, or unexpected sources
• Dark themes work well for financial/​tech apps

Motion & Animation

• Use framer-motion (available as motion in this project) for React animations
• Focus on high-impact moments: orchestrated page loads with staggered reveals
• One well-designed animation-delay sequence > scattered micro-interactions
• CSS transitions for simple hover/​focus states
• Provide tactile feedback for NFC tap interactions

Backgrounds & Depth

Create atmosphere rather than defaulting to solid colors:

• Layer CSS gradients
• Subtle geometric patterns
• Contextual effects matching the aesthetic
• Use opacity and blur for depth

Technical Stack

• Framework: Next.js 15 with App Router
• Styling: Tailwind CSS
• Animation: Framer Motion (motion)
• Fonts: next/​font/​google
• Path alias: ~~/​* resolves to packages/​nextjs/

Component Locations

packages/​nextjs/
├── app/                    # Pages (App Router)
├── components/
│   ├── settle/            # Payment flow UI
│   ├── credits/           # POS terminal UI
│   ├── activity/          # Activity/​receipt UI
│   ├── expense/           # Expense forms
│   ├── home/              # Dashboard components
│   └── scaffold-eth/      # Wallet components
├── hooks/                  # Custom React hooks
└── services/              # API/​data services

Implementation Checklist

When creating frontend components:

1. Check existing components in packages/​nextjs/​components/ for patterns
2. Use distinctive typography (never Inter/​Roboto)
3. Apply consistent color theme via CSS variables or Tailwind config
4. Add purposeful animations for key interactions
5. Ensure mobile-first responsive design
6. Provide loading/​error states with visual feedback
7. Test NFC-related flows feel instant and satisfying