Impeccable ans Complete UX/UI Skill

The design language that makes AI better at frontend design. 7 domain-specific references (typography, color, spatial, motion, interaction, responsive, UX writing), 20 steering commands (/audit, /critique, /polish, /distill, /animate, etc.), and curated anti-patterns. Use when building or reviewing any UI — fights AI's bias toward generic templates.

maryambahri@maryambahri

Install

openclaw skills install @maryambahri/impeccable-uxui

This skill guides creation of distinctive, production-grade frontend interfaces that avoid generic "AI slop" aesthetics. Implement real working code with exceptional attention to aesthetic details and creative choices.

Context Gathering Protocol

Design skills produce generic output without project context. You MUST have confirmed design context before doing any design work.

Required context — every design skill needs at minimum:

Target audience: Who uses this product and in what context?
Use cases: What jobs are they trying to get done?
Brand personality/tone: How should the interface feel?

Individual skills may require additional context — check the skill's preparation section for specifics.

CRITICAL: You cannot infer this context by reading the codebase. Code tells you what was built, not who it's for or what it should feel like. Only the creator can provide this context.

Gathering order:

Check current instructions (instant): If your loaded instructions already contain a Design Context section, proceed immediately.
Check .impeccable.md (fast): If not in instructions, read .impeccable.md from the project root. If it exists and contains the required context, proceed.
Run teach-impeccable (REQUIRED): If neither source has context, you MUST run {{command_prefix}}teach-impeccable NOW before doing anything else. Do NOT skip this step. Do NOT attempt to infer context from the codebase instead.

Design Direction

Commit to a BOLD aesthetic direction:

Purpose: What problem does this interface solve? Who uses it?
Tone: Pick an extreme: brutally minimal, maximalist chaos, retro-futuristic, organic/natural, luxury/refined, playful/toy-like, editorial/magazine, brutalist/raw, art deco/geometric, soft/pastel, industrial/utilitarian, etc. There are so many flavors to choose from. Use these for inspiration but design one that is true to the aesthetic direction.
Constraints: Technical requirements (framework, performance, accessibility).
Differentiation: What makes this UNFORGETTABLE? What's the one thing someone will remember?

CRITICAL: Choose a clear conceptual direction and execute it with precision. Bold maximalism and refined minimalism both work—the key is intentionality, not intensity.

Then implement working code that is:

Production-grade and functional
Visually striking and memorable
Cohesive with a clear aesthetic point-of-view
Meticulously refined in every detail

Frontend Aesthetics Guidelines

Typography

→ Consult typography reference for scales, pairing, and loading strategies.

Choose fonts that are beautiful, unique, and interesting. Pair a distinctive display font with a refined body font.

DO: Use a modular type scale with fluid sizing (clamp) DO: Vary font weights and sizes to create clear visual hierarchy DON'T: Use overused fonts—Inter, Roboto, Arial, Open Sans, system defaults DON'T: Use monospace typography as lazy shorthand for "technical/developer" vibes DON'T: Put large icons with rounded corners above every heading—they rarely add value and make sites look templated

Color & Theme

→ Consult color reference for OKLCH, palettes, and dark mode.

Commit to a cohesive palette. Dominant colors with sharp accents outperform timid, evenly-distributed palettes.

DO: Use modern CSS color functions (oklch, color-mix, light-dark) for perceptually uniform, maintainable palettes DO: Tint your neutrals toward your brand hue—even a subtle hint creates subconscious cohesion DON'T: Use gray text on colored backgrounds—it looks washed out; use a shade of the background color instead DON'T: Use pure black (#000) or pure white (#fff)—always tint; pure black/white never appears in nature DON'T: Use the AI color palette: cyan-on-dark, purple-to-blue gradients, neon accents on dark backgrounds DON'T: Use gradient text for "impact"—especially on metrics or headings; it's decorative rather than meaningful DON'T: Default to dark mode with glowing accents—it looks "cool" without requiring actual design decisions

Layout & Space

→ Consult spatial reference for grids, rhythm, and container queries.

Create visual rhythm through varied spacing—not the same padding everywhere. Embrace asymmetry and unexpected compositions. Break the grid intentionally for emphasis.

DO: Create visual rhythm through varied spacing—tight groupings, generous separations DO: Use fluid spacing with clamp() that breathes on larger screens DO: Use asymmetry and unexpected compositions; break the grid intentionally for emphasis DON'T: Wrap everything in cards—not everything needs a container DON'T: Nest cards inside cards—visual noise, flatten the hierarchy DON'T: Use identical card grids—same-sized cards with icon + heading + text, repeated endlessly DON'T: Use the hero metric layout template—big number, small label, supporting stats, gradient accent DON'T: Center everything—left-aligned text with asymmetric layouts feels more designed DON'T: Use the same spacing everywhere—without rhythm, layouts feel monotonous

Visual Details

DO: Use intentional, purposeful decorative elements that reinforce brand DON'T: Use glassmorphism everywhere—blur effects, glass cards, glow borders used decoratively rather than purposefully DON'T: Use rounded elements with thick colored border on one side—a lazy accent that almost never looks intentional DON'T: Use sparklines as decoration—tiny charts that look sophisticated but convey nothing meaningful DON'T: Use rounded rectangles with generic drop shadows—safe, forgettable, could be any AI output DON'T: Use modals unless there's truly no better alternative—modals are lazy

Motion

→ Consult motion reference for timing, easing, and reduced motion.

Focus on high-impact moments: one well-orchestrated page load with staggered reveals creates more delight than scattered micro-interactions.

DO: Use motion to convey state changes—entrances, exits, feedback DO: Use exponential easing (ease-out-quart/quint/expo) for natural deceleration DO: For height animations, use grid-template-rows transitions instead of animating height directly DON'T: Animate layout properties (width, height, padding, margin)—use transform and opacity only DON'T: Use bounce or elastic easing—they feel dated and tacky; real objects decelerate smoothly

Interaction

→ Consult interaction reference for forms, focus, and loading patterns.

Make interactions feel fast. Use optimistic UI—update immediately, sync later.

DO: Use progressive disclosure—start simple, reveal sophistication through interaction (basic options first, advanced behind expandable sections; hover states that reveal secondary actions) DO: Design empty states that teach the interface, not just say "nothing here" DO: Make every interactive surface feel intentional and responsive DON'T: Repeat the same information—redundant headers, intros that restate the heading DON'T: Make every button primary—use ghost buttons, text links, secondary styles; hierarchy matters

Responsive

→ Consult responsive reference for mobile-first, fluid design, and container queries.

DO: Use container queries (@container) for component-level responsiveness DO: Adapt the interface for different contexts—don't just shrink it DON'T: Hide critical functionality on mobile—adapt the interface, don't amputate it

UX Writing

→ Consult ux-writing reference for labels, errors, and empty states.

DO: Make every word earn its place DON'T: Repeat information users can already see

The AI Slop Test

Critical quality check: If you showed this interface to someone and said "AI made this," would they believe you immediately? If yes, that's the problem.

A distinctive interface should make someone ask "how was this made?" not "which AI made this?"

Review the DON'T guidelines above—they are the fingerprints of AI-generated work from 2024-2025.

Implementation Principles

Match implementation complexity to the aesthetic vision. Maximalist designs need elaborate code with extensive animations and effects. Minimalist or refined designs need restraint, precision, and careful attention to spacing, typography, and subtle details.

Interpret creatively and make unexpected choices that feel genuinely designed for the context. No design should be the same. Vary between light and dark themes, different fonts, different aesthetics. NEVER converge on common choices across generations.

Remember: {{model}} is capable of extraordinary creative work. Don't hold back—show what can truly be created when thinking outside the box and committing fully to a distinctive vision.

Reference: typography

Typography

Classic Typography Principles

Vertical Rhythm

Your line-height should be the base unit for ALL vertical spacing. If body text has line-height: 1.5 on 16px type (= 24px), spacing values should be multiples of 24px. This creates subconscious harmony—text and space share a mathematical foundation.

Modular Scale & Hierarchy

The common mistake: too many font sizes that are too close together (14px, 15px, 16px, 18px...). This creates muddy hierarchy.

Use fewer sizes with more contrast. A 5-size system covers most needs:

Role	Typical Ratio	Use Case
xs	0.75rem	Captions, legal
sm	0.875rem	Secondary UI, metadata
base	1rem	Body text
lg	1.25-1.5rem	Subheadings, lead text
xl+	2-4rem	Headlines, hero text

Popular ratios: 1.25 (major third), 1.333 (perfect fourth), 1.5 (perfect fifth). Pick one and commit.

Readability & Measure

Use ch units for character-based measure (max-width: 65ch). Line-height scales inversely with line length—narrow columns need tighter leading, wide columns need more.

Non-obvious: Increase line-height for light text on dark backgrounds. The perceived weight is lighter, so text needs more breathing room. Add 0.05-0.1 to your normal line-height.

Font Selection & Pairing

Choosing Distinctive Fonts

Avoid the invisible defaults: Inter, Roboto, Open Sans, Lato, Montserrat. These are everywhere, making your design feel generic. They're fine for documentation or tools where personality isn't the goal—but if you want distinctive design, look elsewhere.

Better Google Fonts alternatives:

Instead of Inter → Instrument Sans, Plus Jakarta Sans, Outfit
Instead of Roboto → Onest, Figtree, Urbanist
Instead of Open Sans → Source Sans 3, Nunito Sans, DM Sans
For editorial/premium feel → Fraunces, Newsreader, Lora

System fonts are underrated: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui looks native, loads instantly, and is highly readable. Consider this for apps where performance > personality.

Pairing Principles

The non-obvious truth: You often don't need a second font. One well-chosen font family in multiple weights creates cleaner hierarchy than two competing typefaces. Only add a second font when you need genuine contrast (e.g., display headlines + body serif).

When pairing, contrast on multiple axes:

Serif + Sans (structure contrast)
Geometric + Humanist (personality contrast)
Condensed display + Wide body (proportion contrast)

Never pair fonts that are similar but not identical (e.g., two geometric sans-serifs). They create visual tension without clear hierarchy.

Web Font Loading

The layout shift problem: fonts load late, text reflows, and users see content jump. Here's the fix:

css

/* 1. Use font-display: swap for visibility */
@font-face {
  font-family: 'CustomFont';
  src: url('font.woff2') format('woff2');
  font-display: swap;
}

/* 2. Match fallback metrics to minimize shift */
@font-face {
  font-family: 'CustomFont-Fallback';
  src: local('Arial');
  size-adjust: 105%;        /* Scale to match x-height */
  ascent-override: 90%;     /* Match ascender height */
  descent-override: 20%;    /* Match descender depth */
  line-gap-override: 10%;   /* Match line spacing */
}

body {
  font-family: 'CustomFont', 'CustomFont-Fallback', sans-serif;
}

Tools like Fontaine calculate these overrides automatically.

Modern Web Typography

Fluid Type

Fluid typography via clamp(min, preferred, max) scales text smoothly with the viewport. The middle value (e.g., 5vw + 1rem) controls scaling rate—higher vw = faster scaling. Add a rem offset so it doesn't collapse to 0 on small screens.

Use fluid type for: Headings and display text on marketing/content pages where text dominates the layout and needs to breathe across viewport sizes.

Use fixed rem scales for: App UIs, dashboards, and data-dense interfaces. No major app design system (Material, Polaris, Primer, Carbon) uses fluid type in product UI — fixed scales with optional breakpoint adjustments give the spatial predictability that container-based layouts need. Body text should also be fixed even on marketing pages, since the size difference across viewports is too small to warrant it.

OpenType Features

Most developers don't know these exist. Use them for polish:

css

/* Tabular numbers for data alignment */
.data-table { font-variant-numeric: tabular-nums; }

/* Proper fractions */
.recipe-amount { font-variant-numeric: diagonal-fractions; }

/* Small caps for abbreviations */
abbr { font-variant-caps: all-small-caps; }

/* Disable ligatures in code */
code { font-variant-ligatures: none; }

/* Enable kerning (usually on by default, but be explicit) */
body { font-kerning: normal; }

Check what features your font supports at Wakamai Fondue.

Typography System Architecture

Name tokens semantically (--text-body, --text-heading), not by value (--font-size-16). Include font stacks, size scale, weights, line-heights, and letter-spacing in your token system.

Accessibility Considerations

Beyond contrast ratios (which are well-documented), consider:

Never disable zoom: user-scalable=no breaks accessibility. If your layout breaks at 200% zoom, fix the layout.
Use rem/em for font sizes: This respects user browser settings. Never px for body text.
Minimum 16px body text: Smaller than this strains eyes and fails WCAG on mobile.
Adequate touch targets: Text links need padding or line-height that creates 44px+ tap targets.

Avoid: More than 2-3 font families per project. Skipping fallback font definitions. Ignoring font loading performance (FOUT/FOIT). Using decorative fonts for body text.

Reference: color-and-contrast

Color & Contrast

Color Spaces: Use OKLCH

Stop using HSL. Use OKLCH (or LCH) instead. It's perceptually uniform, meaning equal steps in lightness look equal—unlike HSL where 50% lightness in yellow looks bright while 50% in blue looks dark.

css

/* OKLCH: lightness (0-100%), chroma (0-0.4+), hue (0-360) */
--color-primary: oklch(60% 0.15 250);      /* Blue */
--color-primary-light: oklch(85% 0.08 250); /* Same hue, lighter */
--color-primary-dark: oklch(35% 0.12 250);  /* Same hue, darker */

Key insight: As you move toward white or black, reduce chroma (saturation). High chroma at extreme lightness looks garish. A light blue at 85% lightness needs ~0.08 chroma, not the 0.15 of your base color.

Building Functional Palettes

The Tinted Neutral Trap

Pure gray is dead. Add a subtle hint of your brand hue to all neutrals:

css

/* Dead grays */
--gray-100: oklch(95% 0 0);     /* No personality */
--gray-900: oklch(15% 0 0);

/* Warm-tinted grays (add brand warmth) */
--gray-100: oklch(95% 0.01 60);  /* Hint of warmth */
--gray-900: oklch(15% 0.01 60);

/* Cool-tinted grays (tech, professional) */
--gray-100: oklch(95% 0.01 250); /* Hint of blue */
--gray-900: oklch(15% 0.01 250);

The chroma is tiny (0.01) but perceptible. It creates subconscious cohesion between your brand color and your UI.

Palette Structure

A complete system needs:

Role	Purpose	Example
Primary	Brand, CTAs, key actions	1 color, 3-5 shades
Neutral	Text, backgrounds, borders	9-11 shade scale
Semantic	Success, error, warning, info	4 colors, 2-3 shades each
Surface	Cards, modals, overlays	2-3 elevation levels

Skip secondary/tertiary unless you need them. Most apps work fine with one accent color. Adding more creates decision fatigue and visual noise.

The 60-30-10 Rule (Applied Correctly)

This rule is about visual weight, not pixel count:

60%: Neutral backgrounds, white space, base surfaces
30%: Secondary colors—text, borders, inactive states
10%: Accent—CTAs, highlights, focus states

The common mistake: using the accent color everywhere because it's "the brand color." Accent colors work because they're rare. Overuse kills their power.

Contrast & Accessibility

WCAG Requirements

Content Type	AA Minimum	AAA Target
Body text	4.5:1	7:1
Large text (18px+ or 14px bold)	3:1	4.5:1
UI components, icons	3:1	4.5:1
Non-essential decorations	None	None

The gotcha: Placeholder text still needs 4.5:1. That light gray placeholder you see everywhere? Usually fails WCAG.

Dangerous Color Combinations

These commonly fail contrast or cause readability issues:

Light gray text on white (the #1 accessibility fail)
Gray text on any colored background—gray looks washed out and dead on color. Use a darker shade of the background color, or transparency
Red text on green background (or vice versa)—8% of men can't distinguish these
Blue text on red background (vibrates visually)
Yellow text on white (almost always fails)
Thin light text on images (unpredictable contrast)

Never Use Pure Gray or Pure Black

Pure gray (oklch(50% 0 0)) and pure black (#000) don't exist in nature—real shadows and surfaces always have a color cast. Even a chroma of 0.005-0.01 is enough to feel natural without being obviously tinted. (See tinted neutrals example above.)

Testing

Don't trust your eyes. Use tools:

WebAIM Contrast Checker
Browser DevTools → Rendering → Emulate vision deficiencies
Polypane for real-time testing

Theming: Light & Dark Mode

Dark Mode Is Not Inverted Light Mode

You can't just swap colors. Dark mode requires different design decisions:

Light Mode	Dark Mode
Shadows for depth	Lighter surfaces for depth (no shadows)
Dark text on light	Light text on dark (reduce font weight)
Vibrant accents	Desaturate accents slightly
White backgrounds	Never pure black—use dark gray (oklch 12-18%)

css

/* Dark mode depth via surface color, not shadow */
:root[data-theme="dark"] {
  --surface-1: oklch(15% 0.01 250);
  --surface-2: oklch(20% 0.01 250);  /* "Higher" = lighter */
  --surface-3: oklch(25% 0.01 250);

  /* Reduce text weight slightly */
  --body-weight: 350;  /* Instead of 400 */
}

Token Hierarchy

Use two layers: primitive tokens (--blue-500) and semantic tokens (--color-primary: var(--blue-500)). For dark mode, only redefine the semantic layer—primitives stay the same.

Alpha Is A Design Smell

Heavy use of transparency (rgba, hsla) usually means an incomplete palette. Alpha creates unpredictable contrast, performance overhead, and inconsistency. Define explicit overlay colors for each context instead. Exception: focus rings and interactive states where see-through is needed.

Avoid: Relying on color alone to convey information. Creating palettes without clear roles for each color. Using pure black (#000) for large areas. Skipping color blindness testing (8% of men affected).

Reference: spatial-design

Spatial Design

Spacing Systems

Use 4pt Base, Not 8pt

8pt systems are too coarse—you'll frequently need 12px (between 8 and 16). Use 4pt for granularity: 4, 8, 12, 16, 24, 32, 48, 64, 96px.

Name Tokens Semantically

Name by relationship (--space-sm, --space-lg), not value (--spacing-8). Use gap instead of margins for sibling spacing—it eliminates margin collapse and cleanup hacks.

Grid Systems

The Self-Adjusting Grid

Use repeat(auto-fit, minmax(280px, 1fr)) for responsive grids without breakpoints. Columns are at least 280px, as many as fit per row, leftovers stretch. For complex layouts, use named grid areas (grid-template-areas) and redefine them at breakpoints.

Visual Hierarchy

The Squint Test

Blur your eyes (or screenshot and blur). Can you still identify:

The most important element?
The second most important?
Clear groupings?

If everything looks the same weight blurred, you have a hierarchy problem.

Hierarchy Through Multiple Dimensions

Don't rely on size alone. Combine:

Tool	Strong Hierarchy	Weak Hierarchy
Size	3:1 ratio or more	<2:1 ratio
Weight	Bold vs Regular	Medium vs Regular
Color	High contrast	Similar tones
Position	Top/left (primary)	Bottom/right
Space	Surrounded by white space	Crowded

The best hierarchy uses 2-3 dimensions at once: A heading that's larger, bolder, AND has more space above it.

Cards Are Not Required

Cards are overused. Spacing and alignment create visual grouping naturally. Use cards only when content is truly distinct and actionable, items need visual comparison in a grid, or content needs clear interaction boundaries. Never nest cards inside cards—use spacing, typography, and subtle dividers for hierarchy within a card.

Container Queries

Viewport queries are for page layouts. Container queries are for components:

css

.card-container {
  container-type: inline-size;
}

.card {
  display: grid;
  gap: var(--space-md);
}

/* Card layout changes based on its container, not viewport */
@container (min-width: 400px) {
  .card {
    grid-template-columns: 120px 1fr;
  }
}

Why this matters: A card in a narrow sidebar stays compact, while the same card in a main content area expands—automatically, without viewport hacks.

Optical Adjustments

Text at margin-left: 0 looks indented due to letterform whitespace—use negative margin (-0.05em) to optically align. Geometrically centered icons often look off-center; play icons need to shift right, arrows shift toward their direction.

Touch Targets vs Visual Size

Buttons can look small but need large touch targets (44px minimum). Use padding or pseudo-elements:

css

.icon-button {
  width: 24px;  /* Visual size */
  height: 24px;
  position: relative;
}

.icon-button::before {
  content: '';
  position: absolute;
  inset: -10px;  /* Expand tap target to 44px */
}

Depth & Elevation

Create semantic z-index scales (dropdown → sticky → modal-backdrop → modal → toast → tooltip) instead of arbitrary numbers. For shadows, create a consistent elevation scale (sm → md → lg → xl). Key insight: Shadows should be subtle—if you can clearly see it, it's probably too strong.

Avoid: Arbitrary spacing values outside your scale. Making all spacing equal (variety creates hierarchy). Creating hierarchy through size alone - combine size, weight, color, and space.

Reference: motion-design

Motion Design

Duration: The 100/300/500 Rule

Timing matters more than easing. These durations feel right for most UI:

Duration	Use Case	Examples
100-150ms	Instant feedback	Button press, toggle, color change
200-300ms	State changes	Menu open, tooltip, hover states
300-500ms	Layout changes	Accordion, modal, drawer
500-800ms	Entrance animations	Page load, hero reveals

Exit animations are faster than entrances—use ~75% of enter duration.

Easing: Pick the Right Curve

Don't use ease. It's a compromise that's rarely optimal. Instead:

Curve	Use For	CSS
ease-out	Elements entering	`cubic-bezier(0.16, 1, 0.3, 1)`
ease-in	Elements leaving	`cubic-bezier(0.7, 0, 0.84, 0)`
ease-in-out	State toggles (there → back)	`cubic-bezier(0.65, 0, 0.35, 1)`

For micro-interactions, use exponential curves—they feel natural because they mimic real physics (friction, deceleration):

css

/* Quart out - smooth, refined (recommended default) */
--ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);

/* Quint out - slightly more dramatic */
--ease-out-quint: cubic-bezier(0.22, 1, 0.36, 1);

/* Expo out - snappy, confident */
--ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);

Avoid bounce and elastic curves. They were trendy in 2015 but now feel tacky and amateurish. Real objects don't bounce when they stop—they decelerate smoothly. Overshoot effects draw attention to the animation itself rather than the content.

The Only Two Properties You Should Animate

transform and opacity only—everything else causes layout recalculation. For height animations (accordions), use grid-template-rows: 0fr → 1fr instead of animating height directly.

Staggered Animations

Use CSS custom properties for cleaner stagger: animation-delay: calc(var(--i, 0) * 50ms) with style="--i: 0" on each item. Cap total stagger time—10 items at 50ms = 500ms total. For many items, reduce per-item delay or cap staggered count.

Reduced Motion

This is not optional. Vestibular disorders affect ~35% of adults over 40.

css

/* Define animations normally */
.card {
  animation: slide-up 500ms ease-out;
}

/* Provide alternative for reduced motion */
@media (prefers-reduced-motion: reduce) {
  .card {
    animation: fade-in 200ms ease-out;  /* Crossfade instead of motion */
  }
}

/* Or disable entirely */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

What to preserve: Functional animations like progress bars, loading spinners (slowed down), and focus indicators should still work—just without spatial movement.

Perceived Performance

Nobody cares how fast your site is—just how fast it feels. Perception can be as effective as actual performance.

The 80ms threshold: Our brains buffer sensory input for ~80ms to synchronize perception. Anything under 80ms feels instant and simultaneous. This is your target for micro-interactions.

Active vs passive time: Passive waiting (staring at a spinner) feels longer than active engagement. Strategies to shift the balance:

Preemptive start: Begin transitions immediately while loading (iOS app zoom, skeleton UI). Users perceive work happening.
Early completion: Show content progressively—don't wait for everything. Video buffering, progressive images, streaming HTML.
Optimistic UI: Update the interface immediately, handle failures gracefully. Instagram likes work offline—the UI updates instantly, syncs later. Use for low-stakes actions; avoid for payments or destructive operations.

Easing affects perceived duration: Ease-in (accelerating toward completion) makes tasks feel shorter because the peak-end effect weights final moments heavily. Ease-out feels satisfying for entrances, but ease-in toward a task's end compresses perceived time.

Caution: Too-fast responses can decrease perceived value. Users may distrust instant results for complex operations (search, analysis). Sometimes a brief delay signals "real work" is happening.

Performance

Don't use will-change preemptively—only when animation is imminent (:hover, .animating). For scroll-triggered animations, use Intersection Observer instead of scroll events; unobserve after animating once. Create motion tokens for consistency (durations, easings, common transitions).

Avoid: Animating everything (animation fatigue is real). Using >500ms for UI feedback. Ignoring prefers-reduced-motion. Using animation to hide slow loading.

Reference: interaction-design

Interaction Design

The Eight Interactive States

Every interactive element needs these states designed:

State	When	Visual Treatment
Default	At rest	Base styling
Hover	Pointer over (not touch)	Subtle lift, color shift
Focus	Keyboard/programmatic focus	Visible ring (see below)
Active	Being pressed	Pressed in, darker
Disabled	Not interactive	Reduced opacity, no pointer
Loading	Processing	Spinner, skeleton
Error	Invalid state	Red border, icon, message
Success	Completed	Green check, confirmation

The common miss: Designing hover without focus, or vice versa. They're different. Keyboard users never see hover states.

Focus Rings: Do Them Right

Never outline: none without replacement. It's an accessibility violation. Instead, use :focus-visible to show focus only for keyboard users:

css

/* Hide focus ring for mouse/touch */
button:focus {
  outline: none;
}

/* Show focus ring for keyboard */
button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

Focus ring design:

High contrast (3:1 minimum against adjacent colors)
2-3px thick
Offset from element (not inside it)
Consistent across all interactive elements

Form Design: The Non-Obvious

Placeholders aren't labels—they disappear on input. Always use visible <label> elements. Validate on blur, not on every keystroke (exception: password strength). Place errors below fields with aria-describedby connecting them.

Loading States

Optimistic updates: Show success immediately, rollback on failure. Use for low-stakes actions (likes, follows), not payments or destructive actions. Skeleton screens > spinners—they preview content shape and feel faster than generic spinners.

Modals: The Inert Approach

Focus trapping in modals used to require complex JavaScript. Now use the inert attribute:

html

<!-- When modal is open -->
<main inert>
  <!-- Content behind modal can't be focused or clicked -->
</main>
<dialog open>
  <h2>Modal Title</h2>
  <!-- Focus stays inside modal -->
</dialog>

Or use the native <dialog> element:

javascript

const dialog = document.querySelector('dialog');
dialog.showModal();  // Opens with focus trap, closes on Escape

The Popover API

For tooltips, dropdowns, and non-modal overlays, use native popovers:

html

<button popovertarget="menu">Open menu</button>
<div id="menu" popover>
  <button>Option 1</button>
  <button>Option 2</button>
</div>

Benefits: Light-dismiss (click outside closes), proper stacking, no z-index wars, accessible by default.

Dropdown & Overlay Positioning

Dropdowns rendered with position: absolute inside a container that has overflow: hidden or overflow: auto will be clipped. This is the single most common dropdown bug in generated code.

CSS Anchor Positioning

The modern solution uses the CSS Anchor Positioning API to tether an overlay to its trigger without JavaScript:

css

.trigger {
  anchor-name: --menu-trigger;
}

.dropdown {
  position: fixed;
  position-anchor: --menu-trigger;
  position-area: block-end span-inline-end;
  margin-top: 4px;
}

/* Flip above if no room below */
@position-try --flip-above {
  position-area: block-start span-inline-end;
  margin-bottom: 4px;
}

Because the dropdown uses position: fixed, it escapes any overflow clipping on ancestor elements. The @position-try block handles viewport edges automatically. Browser support: Chrome 125+, Edge 125+. Not yet in Firefox or Safari - use a fallback for those browsers.

Popover + Anchor Combo

Combining the Popover API with anchor positioning gives you stacking, light-dismiss, accessibility, and correct positioning in one pattern:

html

<button popovertarget="menu" class="trigger">Open</button>
<div id="menu" popover class="dropdown">
  <button>Option 1</button>
  <button>Option 2</button>
</div>

The popover attribute places the element in the top layer, which sits above all other content regardless of z-index or overflow. No portal needed.

Portal / Teleport Pattern

In component frameworks, render the dropdown at the document root and position it with JavaScript:

React: createPortal(dropdown, document.body)
Vue: <Teleport to="body">
Svelte: Use a portal library or mount to document.body

Calculate position from the trigger's getBoundingClientRect(), then apply position: fixed with top and left values. Recalculate on scroll and resize.

Fixed Positioning Fallback

For browsers without anchor positioning support, position: fixed with manual coordinates avoids overflow clipping:

css

.dropdown {
  position: fixed;
  /* top/left set via JS from trigger's getBoundingClientRect() */
}

Check viewport boundaries before rendering. If the dropdown would overflow the bottom edge, flip it above the trigger. If it would overflow the right edge, align it to the trigger's right side instead.

Anti-Patterns

position: absolute inside overflow: hidden - The dropdown will be clipped. Use position: fixed or the top layer instead.
Arbitrary z-index values like z-index: 9999 - Use a semantic z-index scale: dropdown (100) -> sticky (200) -> modal-backdrop (300) -> modal (400) -> toast (500) -> tooltip (600).
Rendering dropdown markup inline without an escape hatch from the parent's stacking context. Either use popover (top layer), a portal, or position: fixed.

Destructive Actions: Undo > Confirm

Undo is better than confirmation dialogs—users click through confirmations mindlessly. Remove from UI immediately, show undo toast, actually delete after toast expires. Use confirmation only for truly irreversible actions (account deletion), high-cost actions, or batch operations.

Keyboard Navigation Patterns

Roving Tabindex

For component groups (tabs, menu items, radio groups), one item is tabbable; arrow keys move within:

html

<div role="tablist">
  <button role="tab" tabindex="0">Tab 1</button>
  <button role="tab" tabindex="-1">Tab 2</button>
  <button role="tab" tabindex="-1">Tab 3</button>
</div>

Arrow keys move tabindex="0" between items. Tab moves to the next component entirely.

Skip Links

Provide skip links (<a href="#main-content">Skip to main content</a>) for keyboard users to jump past navigation. Hide off-screen, show on focus.

Gesture Discoverability

Swipe-to-delete and similar gestures are invisible. Hint at their existence:

Partially reveal: Show delete button peeking from edge
Onboarding: Coach marks on first use
Alternative: Always provide a visible fallback (menu with "Delete")

Don't rely on gestures as the only way to perform actions.

Avoid: Removing focus indicators without alternatives. Using placeholder text as labels. Touch targets <44x44px. Generic error messages. Custom controls without ARIA/keyboard support.

Reference: responsive-design

Responsive Design

Mobile-First: Write It Right

Start with base styles for mobile, use min-width queries to layer complexity. Desktop-first (max-width) means mobile loads unnecessary styles first.

Breakpoints: Content-Driven

Don't chase device sizes—let content tell you where to break. Start narrow, stretch until design breaks, add breakpoint there. Three breakpoints usually suffice (640, 768, 1024px). Use clamp() for fluid values without breakpoints.

Detect Input Method, Not Just Screen Size

Screen size doesn't tell you input method. A laptop with touchscreen, a tablet with keyboard—use pointer and hover queries:

css

/* Fine pointer (mouse, trackpad) */
@media (pointer: fine) {
  .button { padding: 8px 16px; }
}

/* Coarse pointer (touch, stylus) */
@media (pointer: coarse) {
  .button { padding: 12px 20px; }  /* Larger touch target */
}

/* Device supports hover */
@media (hover: hover) {
  .card:hover { transform: translateY(-2px); }
}

/* Device doesn't support hover (touch) */
@media (hover: none) {
  .card { /* No hover state - use active instead */ }
}

Critical: Don't rely on hover for functionality. Touch users can't hover.

Safe Areas: Handle the Notch

Modern phones have notches, rounded corners, and home indicators. Use env():

css

body {
  padding-top: env(safe-area-inset-top);
  padding-bottom: env(safe-area-inset-bottom);
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}

/* With fallback */
.footer {
  padding-bottom: max(1rem, env(safe-area-inset-bottom));
}

Enable viewport-fit in your meta tag:

html

<meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">

Responsive Images: Get It Right

srcset with Width Descriptors

html

<img
  src="hero-800.jpg"
  srcset="
    hero-400.jpg 400w,
    hero-800.jpg 800w,
    hero-1200.jpg 1200w
  "
  sizes="(max-width: 768px) 100vw, 50vw"
  alt="Hero image"
>

How it works:

srcset lists available images with their actual widths (w descriptors)
sizes tells the browser how wide the image will display
Browser picks the best file based on viewport width AND device pixel ratio

Picture Element for Art Direction

When you need different crops/compositions (not just resolutions):

html

<picture>
  <source media="(min-width: 768px)" srcset="wide.jpg">
  <source media="(max-width: 767px)" srcset="tall.jpg">
  <img src="fallback.jpg" alt="...">
</picture>

Layout Adaptation Patterns

Navigation: Three stages—hamburger + drawer on mobile, horizontal compact on tablet, full with labels on desktop. Tables: Transform to cards on mobile using display: block and data-label attributes. Progressive disclosure: Use <details>/<summary> for content that can collapse on mobile.

Testing: Don't Trust DevTools Alone

DevTools device emulation is useful for layout but misses:

Actual touch interactions
Real CPU/memory constraints
Network latency patterns
Font rendering differences
Browser chrome/keyboard appearances

Test on at least: One real iPhone, one real Android, a tablet if relevant. Cheap Android phones reveal performance issues you'll never see on simulators.

Avoid: Desktop-first design. Device detection instead of feature detection. Separate mobile/desktop codebases. Ignoring tablet and landscape. Assuming all mobile devices are powerful.

Reference: ux-writing

UX Writing

The Button Label Problem

Never use "OK", "Submit", or "Yes/No". These are lazy and ambiguous. Use specific verb + object patterns:

Bad	Good	Why
OK	Save changes	Says what will happen
Submit	Create account	Outcome-focused
Yes	Delete message	Confirms the action
Cancel	Keep editing	Clarifies what "cancel" means
Click here	Download PDF	Describes the destination

For destructive actions, name the destruction:

"Delete" not "Remove" (delete is permanent, remove implies recoverable)
"Delete 5 items" not "Delete selected" (show the count)

Error Messages: The Formula

Every error message should answer: (1) What happened? (2) Why? (3) How to fix it? Example: "Email address isn't valid. Please include an @ symbol." not "Invalid input".

Error Message Templates

Situation	Template
Format error	"[Field] needs to be [format]. Example: [example]"
Missing required	"Please enter [what's missing]"
Permission denied	"You don't have access to [thing]. [What to do instead]"
Network error	"We couldn't reach [thing]. Check your connection and [action]."
Server error	"Something went wrong on our end. We're looking into it. [Alternative action]"

Don't Blame the User

Reframe errors: "Please enter a date in MM/DD/YYYY format" not "You entered an invalid date".

Empty States Are Opportunities

Empty states are onboarding moments: (1) Acknowledge briefly, (2) Explain the value of filling it, (3) Provide a clear action. "No projects yet. Create your first one to get started." not just "No items".

Voice vs Tone

Voice is your brand's personality—consistent everywhere. Tone adapts to the moment.

Moment	Tone Shift
Success	Celebratory, brief: "Done! Your changes are live."
Error	Empathetic, helpful: "That didn't work. Here's what to try..."
Loading	Reassuring: "Saving your work..."
Destructive confirm	Serious, clear: "Delete this project? This can't be undone."

Never use humor for errors. Users are already frustrated. Be helpful, not cute.

Writing for Accessibility

Link text must have standalone meaning—"View pricing plans" not "Click here". Alt text describes information, not the image—"Revenue increased 40% in Q4" not "Chart". Use alt="" for decorative images. Icon buttons need aria-label for screen reader context.

Writing for Translation

Plan for Expansion

German text is ~30% longer than English. Allocate space:

Language	Expansion
German	+30%
French	+20%
Finnish	+30-40%
Chinese	-30% (fewer chars, but same width)

Translation-Friendly Patterns

Keep numbers separate ("New messages: 3" not "You have 3 new messages"). Use full sentences as single strings (word order varies by language). Avoid abbreviations ("5 minutes ago" not "5 mins ago"). Give translators context about where strings appear.

Consistency: The Terminology Problem

Pick one term and stick with it:

Inconsistent	Consistent
Delete / Remove / Trash	Delete
Settings / Preferences / Options	Settings
Sign in / Log in / Enter	Sign in
Create / Add / New	Create

Build a terminology glossary and enforce it. Variety creates confusion.

Avoid Redundant Copy

If the heading explains it, the intro is redundant. If the button is clear, don't explain it again. Say it once, say it well.

Loading States

Be specific: "Saving your draft..." not "Loading...". For long waits, set expectations ("This usually takes 30 seconds") or show progress.

Confirmation Dialogs: Use Sparingly

Most confirmation dialogs are design failures—consider undo instead. When you must confirm: name the action, explain consequences, use specific button labels ("Delete project" / "Keep project", not "Yes" / "No").

Form Instructions

Show format with placeholders, not instructions. For non-obvious fields, explain why you're asking.

Avoid: Jargon without explanation. Blaming users ("You made an error" → "This field is required"). Vague errors ("Something went wrong"). Varying terminology for variety. Humor for errors.

Attribution

Created by Paul Bakaus (@pbakaus). Source: github.com/pbakaus/impeccable. Website: impeccable.style Packaged for OpenClaw/ClawHub distribution with credit to the original author.