Fintech Trust 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 — Fintech Trust:
Deep navy surfaces with crisp white data cards, thin 1px borders, tabular monospace numerals for all monetary figures, and small secure-lock iconography. 10px radius, no ornament. Serious, precise, bank-grade trustworthy.

Color palette — Forest White:
Background #0A1F1A, cards #FFFFFF. Text on dark #E8F3EF, text on card #10241E. Accent #0F9D6C.

Typography — use these exact font families:
- Headings / display: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif
- Monospace / data: "SF Mono", "Cascadia Code", "Fira Code", monospace

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