18 enforceable rules pulled verbatim from the spec
Do
Use Near-Black (`#1c1e21`) for text — not pure black, it's warmer and more readable
Keep font weights between 400-500 — the system uses a narrow weight range for subtle hierarchy
Use the extracted shadow patterns for elevation — they are tuned to match the brand palette
Use full-pill radius (9999px) only for specific elements (avatars, pills, toggles)
Use M Tricolor Blue (`#0457cb`) as the primary accent — it's the brand's signature interactive color
Use 24px border-radius on primary buttons — the brand uses generously-rounded CTAs
Maintain nav height at 64px — consistent vertical space for the navigation bar
Respect the 4px–32px spacing range — the design uses a wide scale for visual breathing room
Each card includes a left image — imagery is part of the card identity, not optional
Place 3 pricing tiers side-by-side on desktop — direct comparison is the value prop
Don't
Don't use pure black (`#000000`) for text — the near-black adds warmth
Don't use weight 700 (bold) or above — 500 is the maximum weight in this system
Don't invent new shadow values — use only the extracted shadow levels
Don't apply pill radius on rectangular buttons or cards — it's reserved for specific interactive elements
Don't introduce additional saturated accent colors — the palette is intentionally controlled
Don't use sharp-cornered or pill buttons — 24px 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
Don't make the nav sticky — this design lets it scroll away to maximize content focus
10
Agent guide & export
Paste-ready prompt + the real files behind this page
Build a UI in the meta.com design system.
Canvas #ffffff · ink #1c1e21 · accent #0457cb.
Type: Optimistic VF — 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.