feel▌

Practical design engineering principles for polishing UI components and interactions. \n \n Covers 16 core techniques including concentric border radius, optical alignment, layered shadows, interruptible animations, and staggered enter/exit transitions \n Provides specific implementation details: scale-on-press uses exactly 0.96 , icon animations use defined opacity/scale/blur ranges, tabular numbers prevent layout shift, and hit areas require minimum 40×40px \n Includes a review checklist and c