- Add CSS variables for brand colors: Primary Blue (#1E73BE), Finance Green (#28A745), Cloud Blue (#A7D8F8), Dark Navy (#0F2C4C), Neutral Gray (#F4F4F4)
- Import Montserrat and Roboto fonts from Google Fonts
- Update navigation bar with brand colors (navy logo, blue active state, green Get Paid button)
- Update landing page hero section with brand color accents and button styling
- Update AuthModal, GetPaid, Settings, and DemoWizard components to use CSS variables
- Apply brand colors to info boxes and secondary UI elements
- Improve visual consistency across all app screens with cohesive color palette
