I have a Flask application already running on the back-end, but its user interface is still a set of placeholder pages. I’d like you to create a clean, responsive front-end using plain HTML and CSS that plugs straight into my existing Flask routes and templates. Here’s what I need from you: • Build polished, mobile-friendly templates (Jinja2) that match the current URL structure. • Apply modern, lightweight CSS so pages load fast without heavy frameworks. • Keep all styling in organised, reusable files; no inline CSS. • Make sure every template renders correctly when served through Flask’s render_template function. I’ll give you: – The Git repo with the present Flask app, including route names and sample data. – Wireframes and a simple style guide. Acceptance criteria: 1. Each route displays its assigned template without console errors. 2. Views pass Lighthouse core-web-vitals with a minimum 90 score on desktop and mobile. 3. Code is commented clearly enough for another developer to extend. If you deliver early, we can iterate on extra UI components and animations as a follow-up. Let’s get this interface ready for users.