Flux Theory design system

---
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).