How does it prevent the Flash of Unstyled Content (FOUC)?

The skill implements a specialized script that checks localStorage and system preferences before the HTML body renders, ensuring the correct theme class is applied instantly.

Is system preference detection automatic?

Yes, it uses prefers-color-scheme media queries to align the application's appearance with the user's operating system settings by default.

Does this skill work with Next.js?

Yes, it specifically supports Next.js through the next-themes library, providing patterns for client-side providers and hydration-safe implementations.

What color space does this skill use?

It leverages the OKLCH color space for CSS variables, which offers better perceptual uniformity and accessibility compared to traditional RGB or HEX.

Does it support manual theme toggling?

Yes, it includes reference implementations for UI toggles that allow users to switch between light, dark, and system modes manually.

Dark/Light Mode Architect

Name: Dark/Light Mode Architect
Author: fusengine

byfusengine

•

Design Tools

Implements seamless theme switching and system preference detection using modern CSS variables and next-themes.

The Dark/Light Modes skill provides a comprehensive framework for implementing high-performance theme systems in modern web applications. It automates the setup of OKLCH-based CSS variables, integrates system-level preference detection via media queries, and ensures a polished user experience by preventing Flash of Unstyled Content (FOUC). Designed for developers using frameworks like Next.js, it streamlines the deployment of theme providers and manual toggles through a multi-agent workflow that validates existing codebases and researches implementation best practices.

Key Features

01OKLCH-based CSS variable architecture for consistent branding

02Multi-agent validation workflow for codebase safety

03FOUC (Flash of Unstyled Content) prevention scripts

04Automatic system color scheme detection and synchronization

052 GitHub stars

06Pre-configured next-themes integration for React and Next.js

Use Cases

01Building a theme-aware design system from scratch

02Adding system preference detection to an existing landing page

03Migrating legacy hardcoded colors to dynamic CSS variables

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add fusengine/agents dark-light-modes

For use in Claude.ai and ChatGPT

Download Skill