What problem does it solve? Interfaces often read as flat, cramped, jumpy, or unfinished because mathematically correct CSS values differ from what looks right. This Skill provides concrete rules for the small design-engineering details that compound into a polished UI. ## Core Features & Use Cases - Optical corrections: Concentric border-radius formula for nested surfaces, visual centering of asymmetric icons, and neutral inset outlines so images don't dissolve into their background. - Typography and stability: text-wrap: balance and pretty for headings and captions, plus tabular-nums on updating numbers to stop layout jitter. - Depth and interaction: Layered transparent shadows for elevation, borders for separation, and 44px minimum hit areas expanded via pseudo-elements without overlapping. - Use Case: While reviewing a dashboard, you notice a counter shifts layout as digits change and nested cards look uneven. Apply font-variant-numeric: tabular-nums and the concentric radius formula, then report the fixes as before/after rows. ## Quick Start Review this component for polish issues and fix the radius, text wrapping, tabular numbers, and hit areas using the interface polish checklist.