Replace global CSS with Tailwind CSS utility classes

[devin-ai-integration]

Summary

Migrates all styling from a monolithic 763-line styles/globals.css file to Tailwind CSS v3 utility classes applied directly on elements. No runtime behavior, component structure, or JS logic was changed.

Key changes:

• Installed tailwindcss, postcss, autoprefixer as dev dependencies
• Added tailwind.config.js with custom theme (colors, marquee animation/keyframes, custom max-800 breakpoint for the existing @media (max-width: 800px))
• Added postcss.config.js
• Replaced globals.css with Tailwind directives (@tailwind base/components/utilities) plus a minimal CSS reset
• Converted all className references in 7 components and 3 pages from custom CSS classes to inline Tailwind utilities

npm run build and npm run lint both pass (only pre-existing warnings).

Updates since last revision

Round 1 — Fixed two issues flagged by Devin Review (3d35ef7):

• FooterBanner button color: text-red-500 (#ef4444) → text-[red] (#ff0000) to match original CSS color: red
• Product detail image transition: Invalid transition-[0.3s] → transition-all duration-300 ease-in-out to correctly replicate transition: .3s ease-in-out

Round 2 — Fixed two more color mismatches flagged by Devin Review (6bf55e8):

• Navbar logo & cart icon: text-gray-500 (#6b7280) → text-[gray] (#808080) to match original CSS color: gray
• Success page icon: text-green-600 (#16a34a) → text-[green] (#008000) to match original CSS color: green

Review & Testing Checklist for Human

• CSS named-color mismatches — Four instances of Tailwind palette colors not matching CSS named colors were caught and fixed during review. The same pattern likely exists elsewhere. Grep for gray-500, gray-400, green-, red- in the diff and cross-reference against the original globals.css to check for remaining mismatches. In particular, border-gray-500 is used for quantity selector borders in both Cart.jsx and product/[slug].js — the original CSS used border: 1px solid gray (#808080), so these should likely be border-[gray].
• Visual parity on all pages — Every CSS rule was manually translated to Tailwind utilities; subtle spacing, color, or layout regressions are possible. Run npm run dev and compare the home page, product detail page, success page, and cart overlay against main.
• Responsive layout at ≤800px — The original @media (max-width: 800px) was mapped to a custom max-800: Tailwind breakpoint. Resize the browser to ~800px and verify HeroBanner, FooterBanner, Cart, and product detail page all reflow correctly.
• Cart slide-in/out animation — Verify the cart overlay slides in smoothly and the backdrop appears. The transition was kept at duration-1000 ease-in-out.
• Marquee animation on product detail page — The "You may also like" carousel should auto-scroll and pause on hover (hover:[animation-play-state:paused]).

Recommended test plan: Run npm run dev, navigate through the home page → product detail → add to cart → open cart → checkout flow. Compare visually against a checkout of main side-by-side, especially at desktop and ≤800px widths. Pay special attention to border colors on quantity selectors and any other gray/green/red-tinted elements.

Notes

• The original globals.css contained some unused/dead CSS classes (e.g., max-qty, text-red, cancel) that were not migrated since no component referenced them.
• Several elements use scale-100 as a base state alongside hover:scale-110 — this is technically redundant but harmless and mirrors the original CSS pattern.
• The [&>h4]:mt-2.5 [&>p]:mt-2.5 selector on the product detail description container uses Tailwind's arbitrary variant syntax to replicate the original .product-detail-desc > p/h4 child selectors.
• No CI is configured for this repository; verification was done locally via npm run build and npm run lint.

Link to Devin session: https://app.devin.ai/sessions/f7450bc5e3fd428d8be42c8066315087
Requested by: @Colhodm

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[devin-ai-integration]

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