make-interfaces-feel-better

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Design engineering principles for making interfaces feel polished. Use when building UI components, reviewing frontend code, implementing animations, hover states, shadows, borders, typography, micro-interactions, enter/exit animations, or any visual detail work. Triggers on UI polish, design details, "make it feel better", "feels off", stagger animations, border radius, optical alignment, font smoothing, tabular numbers, image outlines, box shadows.

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Added on2026-03-14

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Details that make interfaces feel better

Great interfaces rarely come from a single thing. It's usually a collection of small details that compound into a great experience. Apply these principles when building or reviewing UI code.

Quick Reference

Category	When to Use
Typography	Text wrapping, font smoothing, tabular numbers
Layout & Spacing	Border radius, optical alignment, shadows, image outlines
Animations	Interruptible animations, enter/exit transitions, icon animations

Core Principles

1. Concentric Border Radius

Outer radius = inner radius + padding. Mismatched radii on nested elements is the most common thing that makes interfaces feel off.

2. Optical Over Geometric Alignment

When geometric centering looks off, align optically. Buttons with icons, play triangles, and asymmetric icons all need manual adjustment.

3. Shadows Over Borders

Layer multiple transparent

box-shadow

values for natural depth. Shadows adapt to any background; solid borders don't.

4. Interruptible Animations

Use CSS transitions for interactive state changes — they can be interrupted mid-animation. Reserve keyframes for staged sequences that run once.

5. Split and Stagger Enter Animations

Don't animate a single container. Break content into semantic chunks and stagger each with ~100ms delay.

6. Subtle Exit Animations

Use a small fixed

translateY

instead of full height. Exits should be softer than enters.

7. Contextual Icon Animations

Animate icons with

opacity

,

scale

, and

blur

instead of toggling visibility. Spring animations work well here.

8. Font Smoothing

Apply

-webkit-font-smoothing: antialiased

to the root layout on macOS for crisper text.

9. Tabular Numbers

Use

font-variant-numeric: tabular-nums

for any dynamically updating numbers to prevent layout shift.

10. Text Wrapping

Use

text-wrap: balance

on headings. Use

text-wrap: pretty

for body text to avoid orphans.

11. Image Outlines

Add a subtle

1px

outline with low opacity to images for consistent depth.

Common Mistakes

Mistake	Fix
Same border radius on parent and child	Calculate `outerRadius = innerRadius + padding`
Icons look off-center	Adjust optically with padding or fix SVG directly
Hard borders between sections	Use layered `box-shadow` with transparency
Jarring enter/exit animations	Split, stagger, and keep exits subtle
Numbers cause layout shift	Apply `tabular-nums`
Heavy text on macOS	Apply `antialiased` to root

Review Checklist

Nested rounded elements use concentric border radius
Icons are optically centered, not just geometrically
Shadows used instead of borders where appropriate
Enter animations are split and staggered
Exit animations are subtle
Dynamic numbers use tabular-nums
Font smoothing is applied
Headings use text-wrap: balance
Images have subtle outlines

Reference Files

typography.md — Text wrapping, font smoothing, tabular numbers
layout-and-spacing.md — Border radius, optical alignment, shadows, image outlines
animations.md — Interruptible animations, enter/exit transitions, icon animations