18 enforceable rules pulled verbatim from the spec
Do
Use abcNormal as the primary typeface — it defines the brand personality
Keep font weights between 400-600 — the system uses a narrow weight range for subtle hierarchy
Use negative letter-spacing (-1.2px) at display sizes for compressed, editorial headlines
Use Off-White (`#f7f7f7`) as the primary accent — it's the brand's signature interactive color
Use 6px border-radius on buttons — the standard corner rounding for interactive elements
Maintain nav height at 64px — consistent vertical space for the navigation bar
Respect the 4px–40px spacing range — the design uses a wide scale for visual breathing room
Make the hero full-viewport (≥70% screen height) — this design uses an immersive hero, not a tall navbar
Use a single primary CTA in the hero — the design intentionally avoids choice paralysis
Each card includes a none image — imagery is part of the card identity, not optional
Use a 5-column grid on desktop — density matters for this content type
Don't
Don't substitute with generic sans-serif or serif — the custom font carries the brand
Don't use weight 700 (bold) or above — 600 is the maximum weight in this system
Don't increase letter-spacing on headings — the type is designed to run tight at scale
Don't introduce additional saturated accent colors — the palette is intentionally controlled
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
Don't put a CTA button in the nav — this design uses links only at the top
10
Agent guide & export
Paste-ready prompt + the real files behind this page
Build a UI in the runwayml.com design system.
Canvas #ffffff · ink #404040 · accent #f7f7f7.
Type: abcNormal — 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.