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User Interface Wiki

Living wiki of UI design patterns and best practices built with Fumadocs, Next.js, and Base UI components.

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rules/visual-shadow-direction.md

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Consistent Shadow Direction Across UI

All shadows must share the same offset direction to imply a single light source. Mixed directions feel broken.

Incorrect (conflicting light sources):

.card { box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1); }
.modal { box-shadow: 4px 0 8px rgba(0, 0, 0, 0.1); }
.tooltip { box-shadow: 0 -4px 8px rgba(0, 0, 0, 0.1); }

Correct (consistent top-down light):

.card { box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08); }
.modal { box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12); }
.tooltip { box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1); }