Duotone 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 — Duotone:
Every illustration or photo placeholder renders as a two-color duotone block (a dark shadow tone plus a bright highlight tone) — no other color appears except in these duotone areas and one accent. Bold condensed headline type. High-contrast, editorial, graphic-poster feel.

Color palette — Navy Orange:
Background #FFFFFF. Duotone shadow #14213D, highlight #FF8500. Text #14213D.

Typography — use these exact font families:
- Headings / display: "Arial Black", "Helvetica Neue", 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).