feat: Modernize UI with comprehensive UX improvements and contemporary design

[Copilot]

Overview

This PR completely redesigns the Oxc Playground interface with modern design patterns, improved user experience, and full mobile responsiveness. The changes embrace the latest fashion design trends including gradients, glassmorphism effects, smooth animations, and enhanced visual hierarchy.

What's Changed

🎨 Modern Design System

Implemented a comprehensive modern design system throughout the application:

• Gradient Color Palette: Introduced blue/purple gradient backgrounds that create visual depth and modern aesthetics
• Glassmorphism Effects: Added backdrop blur to header and key UI components for a contemporary, premium feel
• Enhanced Shadows: Strategic use of layered shadows (sm, md, lg, xl) to establish clear visual hierarchy
• Consistent Border Radius: Applied modern rounded corners (lg, xl, 2xl) across all components

/* New design system variables */
--shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
--transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
--radius-lg: 0.75rem;

✨ Enhanced Components

Core UI Library:

• Buttons: Gradient backgrounds with active scale animations and improved shadows
• Inputs: Backdrop blur effects with enhanced focus states
• Checkboxes: Gradient backgrounds for checked state with smooth scale transitions
• Switches: Modern gradient styling with active feedback
• Tabs: Gradient backgrounds for active states with hover effects
• Dialogs: Backdrop blur overlays with animated close buttons

Layout Components:

• Header: Glassmorphism effect with sticky positioning for better navigation
• Sidebar: Gradient backgrounds with improved spacing and visual grouping
• Logo: Playful hover effects with scale and rotation animations
• Navigation: Enhanced hover states with smooth icon animations
• Social Icons: Scale effects for better interactive feedback

Output Panels:

• Diagnostic Panel: Card-based design with amber accent borders for better visibility
• Formatter Panel: Enhanced accordion with gradient backgrounds
• Copy Button: Improved visibility with backdrop blur and color-coded states
• Source Map Link: Modern button styling with hover animations

📱 Mobile Responsiveness

Comprehensive mobile optimization throughout:

• Responsive Layout: Proper spacing adjustments across all breakpoints
• Touch-Friendly Controls: Larger touch targets and improved spacing
• Sticky Header: Better navigation on mobile devices with theme switch accessible
• Optimized Tabs: Horizontal scrolling with responsive text sizing
• Adaptive Padding: Context-aware spacing (px-4 md:px-8 pattern)

🎬 Animations & Micro-interactions

Rich animation system for delightful user experience:

• Loading State: Enhanced with bouncing dots and pulsing effects
• Button Interactions: Active scale feedback (scale-95) on click
• Hover Effects: Smooth scale transitions on interactive elements
• Icon Animations: Directional movement on hover (arrows, settings icon rotation)
• Smooth Scrolling: Implemented smooth scroll behavior for better navigation

♿ Accessibility Enhancements

Improved accessibility across the board:

• Enhanced Focus States: Clear 2px outlines with proper offsets
• Better Contrast: Improved text contrast in both light and dark modes
• Keyboard Navigation: All interactive elements properly focusable
• Semantic Structure: Maintained proper HTML semantics

🌙 Dark Mode Optimization

Refined dark mode implementation:

• Optimized gradient backgrounds for dark theme
• Improved contrast ratios for text and borders
• Enhanced glassmorphism effects in dark mode
• Better shadow visibility on dark backgrounds

Technical Details

Modified Files: 30 files changed with 438 additions and 138 deletions

Key Changes:

• Global CSS system with design tokens and smooth transitions
• Enhanced UnoCSS configuration with custom animations
• Improved component variants with modern styling
• Responsive utility classes throughout
• Consistent gradient and shadow patterns

Commits:

1. Initial modernization with gradients and typography improvements
2. Enhanced UI component library with modern aesthetics
3. Output panels enhancement with better UX
4. Mobile responsiveness improvements
5. Final polish with dialog and animation refinements

Testing

• ✅ All code linted with ESLint (no errors)
• ✅ Formatted with Prettier according to project standards
• ✅ Pre-commit hooks verified
• ✅ Visual testing across light and dark modes
• ✅ Responsive testing on various screen sizes

Screenshots

The new design features:

• Modern gradient backgrounds throughout
• Glassmorphism effects on header and key components
• Smooth animations and micro-interactions
• Enhanced visual hierarchy with strategic shadows
• Fully responsive mobile interface
• Improved dark mode aesthetics

Migration Notes

No breaking changes - all existing functionality preserved. The changes are purely visual enhancements that improve the user experience without affecting the underlying behavior or API.

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Fixes: Implements comprehensive UX improvements and modern design overhaul as requested.

Original prompt

Please fully improve the UX, change the layout, and redesign when needed. Embrace the latest fashion design.

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[github-actions]

Preview URL: https://68f9a97070d3e74b1d623f3e--oxc-playground.netlify.app

[github-actions]

Preview URL: https://68f9aa61a8c2cf669f81a97c--oxc-playground.netlify.app