16 enforceable rules pulled verbatim from the spec
Do
Use Near-Black (`#111111`) for text — not pure black, it's warmer and more readable
Use Helvetica Now Text as the primary typeface — it defines the brand personality
Use the extracted shadow patterns for elevation — they are tuned to match the brand palette
Use Near-Black (`#111111`) as the primary accent — it's the brand's signature interactive color
Use 30px border-radius on primary buttons — the brand uses generously-rounded CTAs
Keep navigation fixed to the top — the design uses a persistent navigation pattern
Maintain nav height at 96px — consistent vertical space for the navigation bar
Make the navigation fixed — it stays visible during scroll, signaling content depth
Include a search input directly in the nav — discoverability is a primary UX value here
Each card includes a top image — imagery is part of the card identity, not optional
Don't
Don't use pure black (`#000000`) for text — the near-black adds warmth
Don't substitute with generic sans-serif or serif — the custom font carries the brand
Don't invent new shadow values — use only the extracted shadow levels
Don't introduce additional saturated accent colors — the palette is intentionally controlled
Don't use sharp-cornered or pill buttons — 30px is the CTA border-radius standard
Don't collapse or hide the nav on scroll without an explicit scroll-triggered animation — the design uses fixed nav presence
10
Agent guide & export
Paste-ready prompt + the real files behind this page
Build a UI in the nike.com design system.
Canvas #ffffff · ink #111111 · accent #111111.
Type: Helvetica Now Text — respect the size/weight ladder in §3.
Radius, spacing, shadow: use only the extracted scales (no magic numbers).
Full spec follows — paste the DESIGN.md below into your agent.