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

# Chapter 11: Mobile CRO

60%+ of web traffic is mobile, yet mobile converts 1-3% vs desktop 3-5%.

This chapter is a reference corpus. The original content now lives in section files under `cro-chapter-11/` so the chapter entry point stays short while preserving the full material.

## Reading Path

1. [Thumb Zone Design](cro-chapter-11/01-thumb-zone-design.md) — reach zones, sticky CTA guidance, and CTA sizing rules
2. [Mobile Form Optimization](cro-chapter-11/02-mobile-form-optimization.md) — field reduction, input types, autofill, and validation
3. [Mobile Navigation](cro-chapter-11/03-mobile-navigation.md) — navigation patterns, trade-offs, and breadcrumb guidance
4. [Click-to-Call and App Banners](cro-chapter-11/04-click-to-call-and-app-banners.md) — phone CTA placement and app banner timing
5. [Mobile Page Speed](cro-chapter-11/05-mobile-page-speed.md) — performance priorities, Core Web Vitals, and tools
6. [AMP Considerations](cro-chapter-11/06-amp-considerations.md) — when AMP still fits and when SSR/edge is better
7. [Mobile Checkout](cro-chapter-11/07-mobile-checkout.md) — checkout friction removal and wallet-first guidance
8. [Mobile A/B Testing](cro-chapter-11/08-mobile-ab-testing.md) — mobile-specific experiments and segmentation caveats
9. [Mobile CRO Checklist](cro-chapter-11/09-mobile-cro-checklist.md) — deployment and review checklist

## Key Themes

- Thumb-friendly interaction design beats desktop patterns squeezed onto small screens.
- Mobile conversion work spans design, forms, navigation, speed, and checkout together.
- Testing mobile separately matters because device constraints and user behaviour differ from desktop.

## Related CRO References

- [Chapter 8: Form Optimization](cro-chapter-08.md)
- [Chapter 10: Checkout Flow](cro-chapter-10.md)
- [Chapter 13: Heatmaps and Session Recordings](cro-chapter-13.md)
