I've created a mobile-first Birthday Quotes app with the following features:

Key Features:

• Mobile-optimized design with a maximum width container and touch-friendly interface
• Three categories of quotes: General, Friends, and Family
• WhatsApp sharing - direct integration to share quotes via WhatsApp
• Copy to clipboard functionality for easy sharing
• Responsive tabs for easy navigation between categories
• Beautiful gradient background with a modern card-based layout

Design Highlights:

• Clean, modern interface optimized for mobile screens
• Touch-friendly buttons and spacing
• Gradient background for visual appeal
• Card-based layout for easy reading
• Icons for better visual hierarchy
• Smooth transitions and hover effects

Functionality:

• WhatsApp Share: Clicking the WhatsApp button opens WhatsApp with the quote pre-filled
• Copy Feature: Users can copy quotes to share elsewhere
• Category Navigation: Easy switching between General, Friends, and Family quotes
• Responsive Design: Works perfectly on all mobile device sizes

The app includes 8 carefully curated quotes in each category, covering various birthday sentiments from general well-wishes to more personal messages for friends and family. Each quote is designed to be meaningful and shareable via WhatsApp.