# Flux Theory design system

> Flux Theory design system measured from fluxtheory.in: Oswald font, 7 color hex codes, type scale, spacing and a free DESIGN.md. Dark theme with 100px corners.

Canonical page: https://sitepeel.dev/design-md/fluxtheory.in/

Flux Theory’s website (fluxtheory.in) uses the Oswald font on a black background. Measured by Sitepeel on November 6, 2026.

## What font does Flux Theory use?

Flux Theory uses Oswald (weights 600 and 700) and Geist (weights 400, 500 and 600) on fluxtheory.in. Page titles are 110px at weight 600 (64px on phones) and body text is 16px. Measured on November 6, 2026.

- Oswald (weights 600, 700)
- Geist (weights 400, 500, 600)

## Flux Theory colors: palette and hex codes

Flux Theory’s main colors are #000000 (near black) for the background and #FFFFFF (white) for text. Measured on November 6, 2026.

- #000000: near black
- #FFFFFF: white
- #999999: gray
- #0D1B24: deep blue

## What is Flux Theory built with?

Flux Theory’s website (fluxtheory.in) is built with Shopify, React, React Router, Svelte and Hydrogen. Measured on November 6, 2026.

- JavaScript framework: React 9.7.0, React Router 7.16.0, Svelte 4, Hydrogen
- Animation & 3D: GSAP 3.15.0, Lenis 1.3.26, Three.js r185, React Three Fiber
- Analytics: Meta Pixel 2.9.437, Microsoft Clarity, Google Ads, Google Analytics
- Site builder & CMS: Shopify
- Hosting & CDN: Cloudflare
- UI & CSS: Tailwind CSS 4.x

## Questions and answers

### What font does Flux Theory use?

Flux Theory’s website uses Oswald (weights 600 and 700) and Geist (weights 400, 500 and 600). Page titles are 110px at weight 600 (64px on phones) and body text is 16px. Measured on November 6, 2026.

### What are the Flux Theory colors and hex codes?

On fluxtheory.in: #000000 (near black) for the background and #FFFFFF (white) for text. The color palette above lists all 7 colors with their hex codes and where each one is used.

### What is the Flux Theory design system?

The design system on this page is fluxtheory.in’s, as measured on November 6, 2026: Oswald type and 100px corners, written down as a DESIGN.md. It is not Flux Theory’s own documentation.

### What is Flux Theory built with?

Flux Theory’s website (fluxtheory.in) is built with Shopify, React, React Router, Svelte and Hydrogen. The full tech stack Sitepeel found: React, React Router, Svelte, GSAP, Lenis, Three.js, Meta Pixel, Shopify, Hydrogen and Cloudflare. Measured on November 6, 2026.

### What is the Flux Theory DESIGN.md?

A plain-text file with Flux Theory’s measured colors, type, spacing, corners and components as tokens, plus short rules, in the DESIGN.md format Google published with Stitch. Your AI coding agent reads it and builds in this style. More about DESIGN.md.

### How do I use it with Claude Code or Cursor?

Download the file and put it in your project’s root folder, then ask your agent to follow DESIGN.md. Step-by-step guides: Claude Code, Cursor, Codex, GitHub Copilot.

### Is this Flux Theory’s official design system?

No. Sitepeel measured it from fluxtheory.in’s public page on November 6, 2026. It is an independent analysis, not made or approved by Flux Theory.

### Can I use Flux Theory’s style in my own product?

Use it to learn, prototype and compare. For a real product, make the style your own, and never copy Flux Theory’s logo, name, pictures or text.

### How accurate are the values?

Each value was measured on the rendered page after it fully loaded, on desktop and mobile: colors where they appear, type with tracking, spacing, corners, shadows and hover states. Sites change, so check the date at the top.

## Files

- [DESIGN.md](https://sitepeel.dev/design-md/fluxtheory.in/DESIGN.md): the plain file to put in your project.
- [All brand DESIGN.md files](https://sitepeel.dev/design-md/examples/index.md)

Independent analysis by Sitepeel (sitepeel.dev), not affiliated with Flux Theory.

## The DESIGN.md file

```markdown
---
version: alpha
name: Flux Theory
description: "Dark monochrome interface measured from fluxtheory.in: Oswald type with Geist, tonal surfaces and 100px corners."
colors:
  background: "#000000"
  surface: "#000000"
  on-surface: "#FFFFFF"
  on-background: "#FFFFFF"
  on-surface-variant: "#999999"
  surface-container-low: "#0D1B24"
  overlay: "#FFFFFF21"
  primary: "#FFFFFF"
  on-primary: "#000000"
typography:
  headline-display:
    fontFamily: Oswald
    fontSize: 110px
    fontWeight: 600
    lineHeight: 1
    letterSpacing: -0.05em
  headline-lg:
    fontFamily: Oswald
    fontSize: 24px
    fontWeight: 600
    lineHeight: 1.2
    letterSpacing: -0.02em
  headline-md:
    fontFamily: Oswald
    fontSize: 20px
    fontWeight: 700
    lineHeight: 1.2
    letterSpacing: -0.04em
  body-md:
    fontFamily: Geist
    fontSize: 16px
    fontWeight: 400
    lineHeight: 1.5
  body-lg:
    fontFamily: Geist
    fontSize: 18px
    fontWeight: 600
    lineHeight: 1.2
    letterSpacing: -0.02em
  body-sm:
    fontFamily: Geist
    fontSize: 11px
    fontWeight: 400
    lineHeight: 1.4
  label-lg:
    fontFamily: Oswald
    fontSize: 16px
    fontWeight: 600
    lineHeight: 1
  label-md:
    fontFamily: Geist
    fontSize: 13px
    fontWeight: 500
    lineHeight: 1.2
  label-sm:
    fontFamily: Oswald
    fontSize: 12px
    fontWeight: 600
    lineHeight: 1
    letterSpacing: -0.034em
  headline-display-mobile:
    fontFamily: Oswald
    fontSize: 64px
    fontWeight: 600
    lineHeight: 1
    letterSpacing: -0.05em
  headline-md-mobile:
    fontFamily: Oswald
    fontSize: 28px
    fontWeight: 700
    lineHeight: 1.2
    letterSpacing: -0.04em
rounded:
  md: 100px
spacing:
  xs: 4px
  sm: 8px
  md: 12px
  lg: 20px
  xl: 40px
  gutter: 12px
components:
  button-ghost:
    textColor: "{colors.on-surface}"
    typography: "{typography.label-lg}"
    rounded: "{rounded.md}"
    padding: 0px 24px
  link:
    textColor: "{colors.primary}"
---

# Flux Theory Design System

## Overview

The interface is dark, built on **Near Black (#000000)** with **White (#FFFFFF)** text and almost no color: actions are carried by contrast, not hue.

Type is set in **Oswald** and **Geist**. Headlines run large with tight negative tracking; body text is 16px. The surface language is flat. Corners are mostly 100px.

Measured from [fluxtheory.in](https://www.fluxtheory.in/) on November 6, 2026 at 1440×900 and 390×844 from 184 rendered elements. Values are computed styles from the live page, not the original source files.

## Colors

The palette has 7 roles.

- **Near Black (#000000):** Page background, seen 2 times. Token `background`, CSS `--color-black`.
- **White (#FFFFFF):** Primary text and headings, seen 44 times. Token `on-surface`, CSS `--color-white`.
- **Gray (#999999):** Secondary text, seen 5 times. Token `on-surface-variant`.
- **Deep Blue (#0D1B24):** Raised areas one step from the page, seen 1 time. Token `surface-container-low`.
- **White 13% (#FFFFFF21):** Translucent fill for cards and controls, seen 2 times. Token `overlay`.
- **White (#FFFFFF):** Primary actions (the main text color; the palette is monochrome), seen 59 times. Token `primary`, CSS `--color-white`.
- **Near Black (#000000):** Text and icons on primary. Token `on-primary`.

## Typography

**Oswald** and **Geist** share the interface. Fallback stack: `Oswald, sans-serif`.

- **headline-display:** Oswald 110px at weight 600, line height 1, tracking -0.05em, uppercase (64px on mobile). Page title (h1).
- **headline-lg:** Oswald 24px at weight 600, line height 1.2, tracking -0.02em. Section headings (h2).
- **headline-md:** Oswald 20px at weight 700, line height 1.2, tracking -0.04em, uppercase (28px on mobile). Sub-section headings.
- **body-md:** Geist 16px at weight 400, line height 1.5. Body text.
- **body-lg:** Geist 18px at weight 600, line height 1.2, tracking -0.02em. Lead paragraphs.
- **body-sm:** Geist 11px at weight 400, line height 1.4. Secondary and small text.
- **label-lg:** Oswald 16px at weight 600, line height 1. Large buttons and tabs.
- **label-md:** Geist 13px at weight 500, line height 1.2. Buttons, navigation and labels.
- **label-sm:** Oswald 12px at weight 600, line height 1, tracking -0.034em, uppercase. Small labels and badges.

## Layout

Spacing is mostly on a 4px grid (76% of measured values), with some off-grid steps. Match the measured scale rather than rounding everything.

- **Scale:** xs 4px, sm 8px, md 12px, lg 20px, xl 40px.
- **Gaps:** 12px is the most common gap in flex and grid layouts.
- **Breakpoints:** 599px, 600px.

## Elevation & Depth

The design is flat: no shadows were measured. Hierarchy comes from tonal surface steps (#0D1B24).

## Shapes

Most elements use 100px corners. Measured radii, most used first:

- **md (100px):** 8 elements.

## Components

Measured from the rendered page. Token values reference the tokens above.

- **button-ghost (“EXPLORE PRODUCTS”):** transparent fill, #FFFFFF text, 16px/600, 100px radius, padding 0px 24px.
- **link:** transparent fill, #FFFFFF text, padding 0px.

## Do's and Don'ts

- Do use #000000 for the page and lift surfaces in small steps: #0D1B24.
- Do keep text in 2 levels: #FFFFFF, #999999.
- Do let contrast carry emphasis; primary actions use #FFFFFF on #000000.
- Do set headlines in Oswald with tight tracking (-0.05em).
- Do reuse the measured spacing steps (8px, 12px, 20px).
- Do use 100px corners on most elements.
- Don't add drop shadows for depth; use tonal surfaces.
- Don't introduce new font families beyond Oswald and Geist.
- Don't add saturated accent colors; the measured palette is almost entirely neutral.
- Don't make interface transitions slower than 0.5s.

## Motion

Interface transitions are quick: 0.2s, 0.18s, 0.3s, 0.5s.

- **Easing:** `ease`, `cubic-bezier(0.4, 0, 0.2, 1)`, `cubic-bezier(0.22, 1, 0.36, 1)`.
- **Reduced motion:** the page responds to `prefers-reduced-motion`.

Generated by [Sitepeel](https://sitepeel.dev/design-md/fluxtheory.in/), the free DESIGN.md generator (engine 2026.10.29+b828a475ee10).

```