I've created a modern, minimalist Kwai video downloader application called KLOAD with the orange and white color scheme you requested. The application allows users to:

1. Enter a Kwai profile URL
2. Fetch all videos from that profile
3. View thumbnails of the videos
4. Download all videos at once

The frontend is built with React, TypeScript, and Tailwind CSS, featuring a clean and responsive design. The backend includes API routes that would handle the actual video extraction and downloading functionality.

In a production environment, you would need to implement the actual scraping and downloading logic in the API routes, as the current implementation uses mock data for demonstration purposes.

To make this fully functional, you would need to:

1. Implement the scraping logic to extract videos from Kwai profiles
2. Add proper error handling and validation
3. Implement the actual video downloading functionality
4. Consider adding authentication if needed

The application is designed to be scalable and maintainable with a senior-level code structure.

I've significantly improved the KLOAD interface to make it more beautiful, aligned, and dynamic:

Interface Improvements:

1. Modern Design:

   • Added a subtle gradient background
   • Improved card design with hover effects
   • Better spacing and typography
   • Shadow effects for depth

2. Dynamic Elements:

   • Added animations using Framer Motion for a more polished feel
   • Staggered animations when videos load
   • Smooth transitions between states

3. Better User Experience:

   • Added a progress bar for download tracking
   • Improved loading states with animations
   • Success state after download completion
   • Better error handling with visual feedback

API Implementation:

I've created a more comprehensive API implementation in the lib/api.ts file that demonstrates how you could fetch and download videos from Kwai profiles. The implementation:

1. Handles Large Video Collections:

   • Designed to handle up to 200+ videos efficiently
   • Uses pagination in the UI through a grid layout
   • Shows download progress for large batches

2. Realistic Mock Data:

   • Generates varied and realistic-looking video data
   • Includes titles, durations, and view counts
   • Simulates network delays for a realistic experience

3. Structured Architecture:

   • Separates API logic from UI components
   • Includes error handling and validation
   • Comments explaining how a real implementation would work

In a real implementation, you would need to replace the mock functions with actual web scraping or API calls to Kwai. This would likely require a server-side component using a headless browser like Puppeteer or Playwright to navigate through the Kwai website and extract video information and download links.

The UI is now much more polished and provides excellent feedback to users throughout the process of fetching and downloading videos.