<!-- SPDX-License-Identifier: MIT -->
<!-- SPDX-FileCopyrightText: 2025-2026 Marcus Quinn -->

# Design System: Expo — Do's and Don'ts

## Do

- Use Cloud Gray (`#f0f0f3`) as the page background and Pure White (`#ffffff`) for elevated cards — the two-tone light system is essential
- Keep display headlines at extreme negative letter-spacing (-1.6px to -3px at 64px) for the signature compressed look
- Use pill-shaped (9999px) radius for primary CTA buttons — the organic shape is core to the identity
- Reserve black (`#000000`) for headlines and primary CTAs — it carries maximum authority on the light canvas
- Use Slate Gray (`#60646c`) for secondary text — it's the precise balance between readable and receded
- Maintain enormous vertical spacing between sections (96px+) — the gallery pacing defines the premium feel
- Use product screenshots as the primary visual content — the interface stays monochrome, the products bring color
- Apply Inter at the full weight range (400–900) — weight contrast IS the hierarchy

## Don't

- Don't introduce decorative colors into the interface chrome — the monochromatic palette is intentional
- Don't use sharp corners (border-radius < 6px) on interactive elements — the pill/rounded geometry is the signature
- Don't reduce section spacing below 64px — the breathing room is the design
- Don't use heavy drop shadows — depth comes from background contrast and whisper-soft shadows
- Don't mix in additional typefaces — Inter handles everything from display to caption
- Don't use letter-spacing wider than -0.25px on body text — extreme tracking is reserved for display only
- Don't use borders heavier than 2px — containment is subtle, achieved through background color and gentle borders
- Don't add gradients to the interface — visual richness comes from content, not decoration
- Don't use saturated colors outside of semantic contexts — the palette is strictly grayscale + functional blue
