Cleanui

CleanUI — AI UI Design Enforcement Skill

STOP. Before you write ANY UI code, read this file.

You are an AI code generator with deeply ingrained UI habits that produce recognizable "AI-looking" output. This skill exists to override those habits and produce professional, human-designed interfaces.

Your process for every UI task:

1. Think about what you would NORMALLY generate
2. Check each element against the HARD NO list below
3. Replace every violation with the specified alternative
4. Only then write the code

HARD NO LIST — AUTOMATIC FAIL PATTERNS

If your output contains ANY of these, stop and fix before returning code.

Typography

• BANNED: font-extrabold (800), font-black (900), fontWeight: "800", fontWeight: "900"
• USE INSTEAD: font-bold (700) max. font-semibold (600) for section headings.
• SELF-CHECK: Search your code for "extrabold" and "black". Replace all with "bold".

Logo / Trust Bars

• BANNED: Company names as identical plain text in identical bordered pills/boxes
• USE INSTEAD: Make each logo visually distinct — pair icons with names, vary weight/italic/tracking per logo, or use SVG logos
• SELF-CHECK: Do all logos look identical? Fix it.

Uppercase / Letter Spacing

• BANNED: tracking-[0.18em], tracking-[0.2em], tracking-[0.24em] or any custom wide letter-spacing
• BANNED: More than 2 uppercase tracked labels on the entire page
• USE INSTEAD: Sentence case. If uppercase needed, tracking-wider (0.05em) max.

Eyebrow Badges

• BANNED: Decorative pill/badge above headlines that restates what the headline says (e.g., "AI writing system for content teams")
• USE INSTEAD: Remove entirely, or use factual info: "Now in beta", "Trusted by 2,400 teams", "Free plan available"

Hero Headlines

• BANNED: Headlines wrapping to 4+ lines on desktop
• USE INSTEAD: 4-8 words, max 2 lines. Rewrite shorter.
• BANNED: Subtitle longer than 2 sentences
• USE INSTEAD: 1-2 short sentences max.

Decorative Copy

• BANNED: Ornamental labels like "Live pulse", "Night shift", "Operational clarity without the clutter"
• USE INSTEAD: Real data (status, counts, dates) or remove entirely. Every label must serve a function.

Shadows

• BANNED: shadow-xl, shadow-2xl, blur above 8px on cards
• USE INSTEAD: shadow-sm or shadow-none with subtle border.

Border Radius

• BANNED: Random mixing of rounded-md, rounded-xl, rounded-2xl, rounded-3xl, rounded-[24px], rounded-[32px]
• USE INSTEAD: Pick 2-3 values. Cards: 8-12px. Buttons: 6-8px (or rounded-full for pills). Inputs: 6-8px. Be consistent.

Icons

• BANNED: Unicode characters as icons (↑, ↓, ◌, ⌂, ◫)
• USE INSTEAD: lucide-react (web), @expo/vector-icons (React Native), SF Symbols (iOS), Material Icons (Android)

File Structure

• BANNED: Entire app in a single file
• USE INSTEAD: Separate: screens/pages, components, constants/theme, data, navigation

LAYOUT RULES

Match Layout to Content Type

Anti-Templating Rules

• NEVER use the same layout skeleton for every app. Read the prompt, identify the content type, pick the right layout.
• NEVER use ALL of these together: hero card + grid buttons + drag handle + segmented control + vertical list. That's a template.
• If the app is image-heavy, show actual images — thumbnails, photos — not just icons in rounded squares.
• Use horizontal scrolls (FlatList horizontal, CSS overflow-x-auto) for categories, featured items, content shelves. AI generators underuse these.

DESIGN TASTE

Color Restraint

• Monochrome or near-monochrome palettes often look better than colorful ones.
• Color should appear mainly in actions (buttons, links), status (badges), and highlights (selected states). Not on everything.
• Dark elements (cards, sections) are justified ONLY when they represent a real-world object (credit card, media player, code block) or create deliberate visual rhythm. Not just "for variety."

List Items

• NEVER use letter initials as the only identifier. Use category-specific icons (utensils for restaurant, bus for transport, repeat for subscription) in rounded squares.
• Always include metadata: date/time, category, status. "Restaurant" feels fake. "Restaurant · May 5 · 14:28" feels real.

Filters

• Any list with 5+ items should have a filter or segmented control.
• Segmented control: pill-track style with solid fill on selected segment.

Action Buttons

• Borderless style often looks cleaner: icon in muted-background square + label below. No card wrapper, no shadow, no border needed.

MOBILE RULES

See Mobile Patterns Reference for full iOS color palettes, Android Material 3 tokens, component guidelines, and code examples.

All Platforms

• Use real navigation libraries, not custom View-based nav bars. React Native: @react-navigation/bottom-tabs. iOS: TabView. Android: Material NavigationBar.
• NEVER build floating pill-shaped bottom nav bars. No position: absolute, no borderRadius: 28, no dark floating pill.
• Use Platform.select() or Platform.OS for conditional styling in React Native.
• Define design tokens (colors, spacing, radii, typography) in a constants file.
• Handle 3 states per screen: loading (skeletons), content, empty.

iOS

• Quiet, soft, premium. Restrained color. System fonts (SF Pro). Semantic colors (.label, .secondaryLabel, .systemBackground). Translucent nav/tab bars. listStyle(.insetGrouped). SF Symbols for icons. Hairline separators. Corner radius: 10-12. No heavy shadows — use background contrast.

Android (Material 3)

• Structured, bold, expressive. Material components from material3. Tonal surfaces (tonalElevation) instead of drop shadows. Scaffold with TopAppBar + NavigationBar. ListItem composable for list rows. HorizontalDivider() between items. Corner radius: 12dp for cards. Generate color scheme from seed color.

React Native / Expo

• Platform-conditional colors, shadows, and spacing via Platform.select().
• iOS uses shadowColor/shadowOpacity/shadowRadius. Android uses elevation.
• Different background colors per platform: iOS #F2F2F7, Android #F9F9FF.
• Different primary colors: iOS #007AFF, Android uses Material seed color.

WEB RULES

Creative Freedom + Structure

You have freedom on: color palette, font choice, border radius values, brand personality, background treatments.

You must follow: section structure, hero content limits, component patterns, responsive behavior.

Navigation

• Sticky top with backdrop-blur and semi-transparent background
• Logo left, nav links center, CTA buttons right
• Mobile: hamburger menu

Landing Page Structure

Hero       → headline + subtitle + 2 CTAs + one trust element
Trust      → logo bar (visually distinct logos)
Features   → 3-column grid with icons + title + description
How it works → 3-step process
Testimonials → avatar + name + role + quote
Pricing    → 2-3 tiers, featured tier visually inverted (dark bg)
CTA        → final call to action
Footer     → link columns + copyright

Hero

• Headline + short subtitle + 2 buttons + one trust element. That's it.
• Product mockup/screenshot on the right side of a two-column hero is fine.
• Do NOT put stat cards, complex preview cards with lists, or multi-paragraph descriptions in the hero.

Feature Cards

• Icon container: at least 48px with tinted background. Not tiny.
• Card padding: generous (p-6 to p-8).
• Each card should feel full — icon + title + description.

Pricing

• Featured tier: inverted (dark bg, light text) or thicker border + "Most popular" badge.
• Full-width CTA in each card.

Sign-In

• Two-column: brand panel (left, dark) + form (right).
• Social login above email form.
• Mobile: hide brand panel, show form with logo.

Dashboard

• Sidebar (240-260px) + main content.
• Sidebar: logo, nav items with icons, optional upgrade card.
• Top bar: search + notifications + avatar.
• Content: greeting → stat cards → filtered list with tabs → activity feed.

Dark Mode

• Background: very dark gray, not pure black.
• Text: off-white, not pure white.
• Borders: dark gray. Reduce color saturation.

PRE-OUTPUT CHECKLIST

Before returning code, verify:

Typography:

• No font-extrabold or font-black anywhere
• Max 2 font weights used (regular + bold/semibold)

Visual:

• No tracking-[0.18em] or wider
• Max 2 uppercase labels on the entire page
• Logo bar items look visually distinct from each other
• No shadow-xl or shadow-2xl on cards
• Consistent border radius (2-3 values max)

Hero:

• Headline fits in 2 lines on desktop
• Eyebrow badge (if present) adds new info, doesn't restate headline
• Subtitle is 1-2 sentences, not a paragraph

Structure:

• Multiple files (screens, components, constants, navigation)
• Real icon library (not Unicode)
• Platform-specific styling (React Native)
• Loading/empty states exist

Layout:

• Layout matches content type (not the same template every time)
• List items have category icons + metadata
• Lists with 5+ items have filters