🎨 Skill: tailwind4-expert

Description

Senior specialist in Tailwind CSS 4.0+, focused on the high-performance "Oxide" engine and CSS-first configuration. This skill guides the elimination of JavaScript-heavy build steps in favor of native CSS variables and lightning-fast compilation.

Core Priorities

1. CSS-First Configuration: Moving all tokens to @theme and abandoning tailwind.config.js.
2. Performance Optimization: Leveraging the Rust-based engine for sub-10ms incremental builds.
3. Modern CSS Features: Utilizing native Container Queries, 3D transforms, and @utility without plugins.
4. Design System Integrity: Enforcing a strict token-based workflow using CSS variables.

🚀 Top 5 Gains in Tailwind 4.0

1. Zero-JS Config: The configuration is the CSS. No more context-switching between JS and CSS files.
2. Built-in Container Queries: Native support for @container and variants like @md:grid-cols-2.
3. Dynamic Utilities: Automatic generation of complex utilities like grid-cols-(--my-grid-count).
4. Native 3D Transforms: Utilities like rotate-x-45 and perspective-1000 work out of the box.
5. Composability by Default: Every utility is designed to be composed without conflict using the new Oxide engine logic.

🛠️ Implementation Example: The Modern Layout (2026)

Combining Container Queries, 3D Transforms, and @theme variables for a cutting-edge UI.

// 1. Define tokens in globals.css
// @theme { --color-neon: #00f0ff; --perspective-deep: 1200px; }

export function ModernCard() {
  return (
    <div className="@container perspective-(--perspective-deep) p-8">
      <div className="
        group relative transform-3d transition-all duration-500
        hover:rotate-y-12 hover:rotate-x-6
        bg-zinc-900 border border-white/10 rounded-2xl
        p-4 @md:p-8 @lg:p-12
      ">
        <div className="text-zinc-400 @md:text-lg @lg:text-2xl font-medium">
          Responsive to Parent
        </div>
        
        <div className="mt-4 h-1 bg-neon shadow-[0_0_15px_var(--color-neon)]" />
        
        <div className="mt-8 grid grid-cols-1 @md:grid-cols-3 gap-4">
          <div className="aspect-square bg-white/5 rounded-lg" />
          <div className="aspect-square bg-white/5 rounded-lg" />
          <div className="aspect-square bg-white/5 rounded-lg" />
        </div>
      </div>
    </div>
  )
}

Table of Contents & Detailed Guides

1. Migration from v3 to v4 — CRITICAL

• Automated upgrade tool (npx @tailwindcss/upgrade)
• Manual migration: Removing tailwind.config.js
• PostCSS vs. Lightning CSS integration

2. The @theme Block & Design Systems — CRITICAL

• Defining colors, fonts, and spacing tokens
• Overriding vs. Extending the default theme
• Using CSS variables (var(--color-*)) instead of theme()

3. Advanced Layout & Container Queries — HIGH

• Native Container Query variants (@md:, @lg:)
• Complex Grid configurations with dynamic variables
• 3D Transforms and Perspective

4. Custom Utilities & @utility — MEDIUM

• The new @utility directive syntax
• Handling functional/dynamic values in custom classes
• Avoiding arbitrary values with local theme variables

Quick Reference: The "Do's" and "Don'ts"

Don't	Do
tailwind.config.js	@theme { ... } in CSS
@tailwind base; @tailwind components;	@import "tailwindcss";
theme('colors.brand')	var(--color-brand)
arbitrary-vals-[123px]	Define in @theme or local --variable
npm install @tailwindcss/container-queries	Use native @md: variants
import { ... } from 'tailwind-merge'	Trust the Oxide engine for composition

---

Optimized for Tailwind CSS 4.0+ and Lightning CSS. Updated: January 22, 2026 - 14:59