Retro Y2K Shopping Cart

Act like a frontend developer with 15 years of experience. I want the exact same UI with 95-99% similarity.

Platform: This is a RESPONSIVE design — it should work on both mobile and desktop. Use mobile layout patterns (bottom nav, stacked content) for mobile, and desktop layout patterns (sidebar/nav bar, wider content areas) for web.

Design a cart screen with a list of item rows (thumbnail, name, quantity stepper, price), a promo-code field, an order summary block, and a sticky checkout button.

Visual style — Retro Y2K:
Chrome and metallic silver gradient surfaces on a saturated background. Bubble-style bold rounded typography, with some headings filled by a chrome gradient. Pill shapes everywhere, star and sparkle motifs, thick white outlines. Loud, nostalgic, early-2000s optimistic.

Color palette — Lime Shock:
Background #B4FF39. Accents #FF3D00 orange-red and #7B2FF7 purple.

Typography — use these exact font families:
- Headings / display: "Arial Black", "Impact", sans-serif
- Body / labels: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif

Commit fully to this style — it should be unmistakable at a glance. Use realistic content, not placeholder text. Keep animations smooth (200ms ease-out).