Rules for creating good-looking user interfaces, from a developer

Good UI design fundamentally relies on two principles: alignment and consistency, which address why subtle misalignments (like inconsistent icon positioning or varying element weights) make interfaces feel jarring even when invisible to untrained eyes. The author achieved dramatic visual improvements in Lighthouse by focusing exclusively on these two aspects rather than pursuing expert-level design knowledge, and recommends maintaining consistency across pages over local optimization and leveraging existing component libraries to enforce design coherence efficiently.

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