Vintage Sepia 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 — Vintage Sepia:
A warm sepia-toned background with a subtle film-grain and vignette texture, ornate thin double-rule borders, and a classic serif display type reminiscent of old photographs and letterpress. An aged-paper texture on card surfaces. Nostalgic, antique, old-photograph warmth.

Color palette — Ash Brown:
Background #DED6C9. Text #322B22. Rules #665A47.

Typography — use these exact font families:
- Headings / display: Georgia, "Times New Roman", 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).