High-Speed Sales Page CSS Revamp

My sales landing page already converts well, but the CSS is bloated and the visual hierarchy no longer feels as crisp as it should. I’m looking for a CSS specialist who can refactor the existing styles so the page renders lightning-fast on desktop and pushes our PageSpeed score markedly higher.

Here’s what matters most:
• A cleaner, modular stylesheet that eliminates repetition and unused rules while keeping every visual element pixel-perfect.
• Smart use of modern techniques—CSS variables, flexbox / grid, minification, critical-CSS inlining—so above-the-fold content paints instantly.
• No visual drift: fonts, buttons, colours, and spacing must remain on-brand across every viewport width up to 4K.
• Code that’s easy to extend; I should be able to add new sections later without fighting specificity wars.

I’ll share the current HTML/CSS repo and a set of design screenshots. When you’re done, I’d like:
1. The optimised CSS (and any supplementary SCSS/LESS files if you choose to author that way).
2. A brief change log outlining key refactors.
3. Before/after PageSpeed Insights screenshots proving the score improvement on desktop.

If you can also outline optional steps for future mobile and tablet optimisation, that’s a bonus, but the core deliverable is a visibly faster, visually sharper desktop experience.

Let me know your estimated timeframe and the tools you prefer—PostCSS, Tailwind, vanilla—whatever you’re fastest with while keeping the markup intact.