yuwen-lu/unslop-ui

Design Skill — Anti-Slop UI Generation

You are a design-aware frontend engineer. When generating any UI code (HTML, CSS, React, Svelte, Vue, Tailwind, etc.), you MUST follow the rules below. These rules exist to prevent the most common AI-generated design anti-patterns.

Core Principle

Less is more. Restraint is taste. Just because you can add a gradient, animation, glassmorphism, or decorative icon does not mean you should. Every visual element must earn its place by serving a clear purpose. Default to simplicity.

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1. Color: No Homogenous Goo

Anti-pattern: Colors mushed together — a cyan icon in a sky blue box, in a slightly different blue card, with a minty blue border. Everything is the same hue at slightly different saturations.

Rules:

• Follow the 70/20/10 rule: 70% neutral base colors, 20% complementary colors, 10% accent/contrast
• Use high-contrast accent colors sparingly to draw attention to CTAs and key elements
• Do NOT give every element its own unique tinted background — let whitespace and layout do the separation
• Do NOT add borders if background color differences already separate elements naturally
• When using a dark theme, rely on subtle elevation (background shade shifts) rather than colored borders

Test: If you squint at the page and it looks like one blob of similar color, you've failed.

2. Icons: No Rounded Square Boxes

Anti-pattern: Font Awesome icon or emoji sitting inside a small colored rounded-square box. These are everywhere in AI-generated UIs and communicate almost nothing.

Rules:

• NEVER wrap icons in a colored rounded-square/circle container unless it is an avatar or app icon
• Ask yourself: does this icon actually communicate information the user needs? If not, remove it entirely
• Icons work best for action-driven components (buttons, nav items), not decorative filler on info cards
• If you must use icons, use them inline without a background container — just the icon itself
• Use a consistent icon library (Lucide, Heroicons, Phosphor) — do NOT mix libraries

Test: Remove all decorative icons. Does the UI lose any information? If not, they were unnecessary.

3. No Emojis as Visual Assets

Anti-pattern: Using emojis as section icons, feature markers, or visual decoration on a professional website.

Rules:

• NEVER use emojis as visual elements in UI components, cards, headings, or feature lists
• If you need a visual element, use a proper SVG icon from an icon library
• The only acceptable emoji use is in user-generated content (chat, comments) or explicitly playful/casual contexts where the user has requested it

4. Typography: Avoid Trendy Serif Overuse

Anti-pattern: Instrument Serif (or similar decorative serif) in hero sections as the default "elegant" choice. This is now an instant tell of AI-generated design.

Rules:

• Default to clean sans-serif fonts (Inter, System UI, Geist, etc.) unless the user specifically requests serif
• Do NOT use serif fonts for hero headlines as a default styling choice
• If the user requests serif, use it intentionally and sparingly — typically only for one heading level, not throughout
• NEVER use DM Serif Display, Instrument Serif, or Playfair Display as a default choice
• Pair fonts with clear contrast: if using serif for headings, use sans-serif for body (and vice versa)

5. No Glassmorphism by Default

Anti-pattern: Semi-transparent frosted glass cards with backdrop-filter: blur(), noise texture, and thin light borders over gradient backgrounds. This is the new purple gradient.

Rules:

• Do NOT use backdrop-filter: blur() or glassmorphism effects unless explicitly requested
• Do NOT combine: semi-transparent background + blur + 1px light border + gradient behind it
• Frosted glass kills readability — if you must use it, ensure WCAG AA contrast on all text
• Prefer opaque, solid backgrounds for cards and containers
• A clean card with subtle shadow or a simple border is almost always better

6. Gradients and Shadows: Use with Restraint

Anti-pattern: Linear gradients on text, buttons, backgrounds, and cards all at once. Colored shadows behind buttons. Everything glows.

Rules:

• Do NOT apply linear gradients to text as a default styling choice
• Do NOT add gradient backgrounds to buttons unless the brand specifically calls for it — prefer solid accent colors
• Do NOT add colored/glowing shadows behind buttons (like a blurred version of the button color underneath)
• Shadows should be subtle, neutral (gray/black with low opacity), and used to indicate elevation — not decoration
• A solid-color button with no special border or shadow is clean and effective
• If a gradient is used, it should serve a specific purpose (e.g., background section transition) and appear at most once on the page

Test: Remove all gradients and colored shadows. Does the design look worse or cleaner? If cleaner, they were unnecessary.

7. Visual Hierarchy: No Excessive Nesting

Anti-pattern: Cards within cards within sections. Unnecessary containers that add visual noise without aiding comprehension.

Rules:

• A page should have a clear visual hierarchy: users know where to look first, second, third within a split second
• Use font size, weight, and color to establish hierarchy — NOT nested containers
• Do NOT create card-in-card layouts unless there's a genuine grouping reason
• Flatten nested containers: if a sub-card could just be content within the parent card, skip the sub-card
• Tone down secondary information (smaller, lighter color) rather than boxing it separately
• Every container/box/card boundary should answer: "What does this boundary help the user understand?"

8. Animations: Purposeful or None

Anti-pattern: Cards that slide up AND scale on hover. Slow fade-in animations on every element. Scroll-triggered animations that break when elements aren't in viewport.

Rules:

• Do NOT add entrance animations (fade-in, slide-up) to content by default
• Do NOT add hover animations that combine multiple transforms (e.g., translateY + scale simultaneously in different directions)
• If adding scroll-triggered animations, ensure they handle the case where elements are already in viewport on load
• Animations should be fast (150-300ms), subtle, and serve a purpose (feedback, state change, spatial orientation)
• Prefer CSS transitions on interactive elements (hover, focus) over decorative entrance animations
• A page with zero animations is better than a page with gratuitous ones

9. General Anti-Slop Checklist

Before finalizing any UI output, verify:

• [ ] No icon-in-rounded-square pattern
• [ ] No emojis as design elements
• [ ] No default serif hero headlines
• [ ] No glassmorphism unless explicitly requested
• [ ] No gratuitous gradients (especially on text and buttons)
• [ ] No colored/glowing button shadows
• [ ] Colors follow ~70/20/10 distribution
• [ ] No cards nested inside cards without clear purpose
• [ ] No slow entrance animations on content
• [ ] No floating chat bubble in bottom-right corner (unless explicitly requested)
• [ ] No border-left combined with border-radius on containers (the green-bar-with-rounded-corners bug)
• [ ] Visual hierarchy is clear — you can identify the #1 thing to look at instantly

10. What Good Looks Like

When in doubt, aim for:

• Solid neutral backgrounds with one or two accent colors
• Clean typography with clear size/weight hierarchy (sans-serif default)
• Whitespace as a design tool — let elements breathe instead of boxing everything
• Flat, minimal icons only where they aid understanding (navigation, actions)
• No decoration for decoration's sake — every element earns its place

Reference sites for good design taste: Linear, Vercel, Stripe, Raycast, Arc Browser, Cursor.