version: "1.0.1" name: frontend-prime description: > Build distinctive, production-grade frontend interfaces. Use when creating any web UI — sites, apps, dashboards, components. Focuses on design quality and avoiding generic AI aesthetics. Composable with other skills (docx, pdf, xlsx).

Ultimate Frontend Skill

Every output must feel intentionally crafted — never generic, never "AI slop."

1. Design Before Code

Before writing ANY code, decide:

1. Aesthetic direction (pick ONE, match it to the product's audience):

Brutally minimal · Maximalist editorial · Retro-futuristic · Organic/natural · Luxury/refined · Playful · Brutalist · Art deco · Dark/moody · Lo-fi/zine · Handcrafted · Swiss/international · Neo-glassmorphic · Industrial · Soft/pastel

1. One unforgettable element: a scroll animation, a bold typographic moment, a micro-interaction — something memorable.

1. Then commit fully. Half-hearted design = generic output.

2. The AI Slop Blacklist

These instantly mark output as AI-generated. Never:

• Purple/blue gradient on white cards
• Every element with identical rounded-xl
• Perfectly centered, symmetrical layouts with no visual tension
• text-gray-600 on everything
• Cards in a perfect 3-column grid with identical heights
• Rainbow or evenly-distributed color schemes
• Generic hero with stock illustration placeholder

Instead, always:

• Load distinctive Google Fonts (Instrument Serif, DM Sans, Clash Display, Bricolage Grotesque, Syne, Fraunces, Cabinet Grotesk, Satoshi, Young Serif, Outfit)
• One dominant color doing 80% of the work + one sharp accent
• Asymmetric layouts, grid-breaking elements, dramatic scale jumps
• Atmosphere via gradient meshes, noise textures, glassmorphism, or depth layers
• Generous negative space as a design element
• Negative letter-spacing on large headings, text-wrap: balance on headlines
• Body text max-width: 65ch, line-height: 1.5–1.7

3. Color & Theming — Do It Right

Define colors as CSS custom properties with semantic names. Never hardcode hex in components.

[data-theme="light"] {
  --bg-primary: #fafafa; --bg-secondary: #ffffff;
  --text-primary: #18181b; --text-secondary: #52525b;
  --accent: #2563eb; --border: #e4e4e7;
}
[data-theme="dark"] {
  --bg-primary: #09090b; --bg-secondary: #18181b;
  --text-primary: #fafafa; --text-secondary: #a1a1aa;
  --accent: #3b82f6; --border: #27272a;
}

Dark mode rules: higher elevation = lighter surface, desaturate accents ~15%, use borders not shadows for hierarchy, offer Light/Dark/System toggle, persist in localStorage and apply before paint.

4. SEO — Claude Forgets This

Every page needs:

<title>Page Title — Brand</title>
<meta name="description" content="150-160 chars">
<link rel="canonical" href="https://example.com/page">
<meta property="og:title/description/image/url" ...>
<meta name="twitter:card" content="summary_large_image">

Also: JSON-LD structured data, sitemap.ts + robots.ts, one h1 per page, no skipped heading levels, descriptive alt text, clean lowercase hyphenated URLs, hreflang for i18n.

In Next.js: use metadata export with metadataBase, openGraph, twitter, alternates.canonical.

5. Quick Reminders

• Motion: Stagger entrances, hover states on all interactives, 0.2s ease micro-interactions, always respect prefers-reduced-motion
• Mobile: Mobile-first, clamp() for fluid type/spacing, dvh not vh, 44×44px touch targets
• A11y: Semantic HTML, <button> for actions / <a> for links, aria-label on icon buttons, 4.5:1 contrast, full keyboard nav
• Perf: font-display: swap, lazy load images with dimensions, content-visibility: auto, LCP<2.5s
• Forms: Visible labels always, validate on blur, helpful error messages, correct input type + autocomplete
• Errors: Error boundaries per section, custom 404/500, toast for feedback (auto-dismiss success, persist errors)
• Security: CSP headers, never unsanitized dangerouslySetInnerHTML, validate URLs in href, httpOnly cookies for auth, server-side validation