Bold Responsive Auth Interface

I need a polished authentication experience built from the ground up, featuring both Login and Registration screens that look just as sharp on desktop monitors as they do on tablets and mobile phones. My visual direction is bold and vibrant—strong colors, confident typography, and eye-catching buttons that still respect good spacing, hierarchy, and accessibility guidelines.

Core flow:
• Login form with email/username and password fields, password-visibility toggle, “Remember me” checkbox, and a clear forgot-password link.
• Registration form that mirrors the visual language of the login screen and carries the same real-time validation and friendly error/success messaging.

Third-party options must sit prominently beside the standard form: Google, Facebook, and GitHub OAuth buttons styled to match their brand guidelines while feeling at home in the overall design.

Everything should be fully responsive, leveraging flexible grids or modern CSS (Flexbox / Grid) so the interface scales smoothly without breakpoints showing seams. Please keep the mark-up clean and ready for drop-in integration with a larger web app; componentised HTML5, semantic CSS3 (SCSS welcome), and unobtrusive JavaScript are ideal. If you prefer React, Vue, or similar, let me know—reusable components are a bonus.

Deliverables
- Login page (HTML/CSS/JS or component files) with full validation, error handling, and the three OAuth buttons
- Registration page with matching features and styling
- Shared style sheet / component library documenting typography, colour tokens, spacing, and button states
- README with setup instructions and notes on how to plug the UI into an existing backend

I’ll review on:
1. Pixel-perfect consistency across desktop, tablet, and mobile views
2. Smooth transitions and clear feedback for every user interaction
3. Accessibility support (keyboard navigation, ARIA labels, colour contrast)
4. Code clarity and ease of future maintenance

If this matches your skill set, I’m ready to move quickly—show me examples of similarly bold, responsive UIs you’ve shipped, and let’s create an interface users will enjoy every time they sign in.