I have an existing HTML site that’s partially built and now needs a professional polish and the remaining pages brought to life. The overall aesthetic must stay modern and clean—consistent typography, generous white space, and intuitive section hierarchy. What I still need: • Complete any unfinished page sections (common areas are the hero, About, Contact, and footer). • Tidy up the current markup so it’s semantic, lightweight, and easy to maintain. • Apply responsive CSS rules so the layout works smoothly from mobile to desktop without any framework bloat. • Add a simple JavaScript-powered interaction where it enhances usability—smooth scrolling, menu toggle, or modal pop-ups are typical examples. • If a basic contact or newsletter form is the best way to capture leads, wire it up with front-end validation and leave placeholders for the back-end endpoint. Please build directly on the existing file structure; I’ll give you the Git repo or zipped source as soon as we start. Deliver finished HTML, CSS, and any JS in clear, well-commented code so I can hand it to a back-end developer or upload it myself with zero friction.