Mobile is no longer the secondary device
Google indexes the mobile version of your site first. If the mobile UX is broken, the desktop UX is irrelevant for SEO.
B2B is no exception — over 65% of decision-makers research vendors on a phone before involving IT.
Start from the smallest viewport
Design the 360px experience first. Every element fights for space, which forces hard prioritisation and a cleaner desktop layout for free.
Use modern CSS — container queries, fluid typography, logical properties for RTL — instead of breakpoint soup.
Performance is a feature
Core Web Vitals — LCP, INP, CLS — are direct ranking signals. Targets: LCP under 2.5s, INP under 200ms, CLS under 0.1.
Image optimisation, lazy loading, code splitting, and an edge CDN typically move the needle more than any framework choice.
Accessibility doubles your audience
WCAG 2.2 AA is the minimum bar in most jurisdictions. Semantic HTML, proper colour contrast, keyboard navigation and ARIA labels are not optional.
Accessible sites also rank better — Google's algorithm rewards the same patterns assistive tech relies on.
Consider a PWA for engagement
For content-heavy or transactional sites, a Progressive Web App with offline support, push notifications and an installable icon increases repeat visits significantly — without the cost of a native app.
Conclusion
Mobile-first is not a trend; it is the baseline. Build it that way and SEO, conversion and accessibility improve in lockstep.
