LangChain — Design System

Name: LangChain design system
Creator: Mozaika
Keywords: design system, design tokens, LangChain, dark, custom

dark · modern · medium · custom · confidence 90%

The full decoded design system for LangChain: color roles, type scale, spacing, radii and paste-ready DESIGN.md / Tailwind / CSS exports.

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This is a static, crawlable rendering for search & AI engines. The interactive version — filters, live decode console, copy & export — is at https://mozaika.design/ds/langchain.

Tokens

LangChain's decoded design system: background #030710, text #E5F4FF, accent #7FC8FF, link #7FC8FF, primary #CCE9FF; type scale h1 63px / h2 54px / body 20.25px; 4px spacing base; 18px base radius. The single interactive/action color is #E5F4FF — used only on interactive or must-notice elements (buttons, links, key highlights), never on large fills.

Color roles

Role	Value
bg	`#030710`
surface	`#10151E`
border	`#242A33`
text	`#E5F4FF`
text_muted	`#8F99A4`
primary	`#CCE9FF`
accent	`#7FC8FF`
link	`#7FC8FF`
secondary	`#E5F4FF`
button_bg	`#E5F4FF`
button_text	`#030710`

Using these colors

Action color #E5F4FF — the single interactive color; only on things you click or must notice, never large fills.
accent, link are all #7FC8FF — one role, not several (the action color).
secondary, button_bg are all #E5F4FF — one role, not several (the action color).
accent #7FC8FF — accent for emphasis — keep it rare on the page.
primary #CCE9FF — a neutral UI color (chips, tags, icon fills, chrome), not the action color (action = #E5F4FF).

Typography

Heading: Twklausanne
Body: Aeonik
h1: 63px
h2: 54px
body: 20.25px

Spacing

base unit: 4px
scale: 2px, 4px, 6px, 8px, 12px, 16px, 24px, 32px

Radii

base: 18px
button: 7px

Per-section tokens (13)

Export: DESIGN.md

# LangChain — Design System

> dark, modern, medium, custom

## Colors

| Role | Value |
|------|-------|
| bg | `#030710` |
| surface | `#10151E` |
| border | `#242A33` |
| text | `#E5F4FF` |
| text_muted | `#8F99A4` |
| primary | `#CCE9FF` |
| accent | `#7FC8FF` |
| link | `#7FC8FF` |
| secondary | `#E5F4FF` |
| button_bg | `#E5F4FF` |
| button_text | `#030710` |

**Using these colors**

- **Action color** `#E5F4FF` — the single interactive color; it appears only on things you click or must notice (buttons, key highlights), never on large fills or backgrounds.
- `accent`, `link` are all `#7FC8FF` — one role, not several.
- `secondary`, `button_bg` are all `#E5F4FF` — one role, not several (your action color).
- **accent** `#7FC8FF` — accent for emphasis — keep it rare on the page.
- **primary** `#CCE9FF` — a neutral UI color (chips, tags, icon fills, chrome), not the action color (action = #E5F4FF).

## Typography

- Heading: **Twklausanne** _(free fallback: Newsreader)_
- Body: **Aeonik** _(free fallback: Space Grotesk)_
- h1: 63px
- h2: 54px
- body: 20.25px

> **Fonts —** Twklausanne may be proprietary — safe free fallback: Newsreader (Google Fonts). Aeonik is proprietary — closest free match: Space Grotesk (Google). Load Space Grotesk; keep Aeonik first so licensed users still get it.

## Spacing
- base unit: 4px
- scale: 2px, 4px, 6px, 8px, 12px, 16px, 24px, 32px

## Radius
- base: 18px
- button: 7px

## Primary button
- bg `#E5F4FF` · text `#030710` · radius 7px

## How to apply
Paste the Tailwind `@theme` (or CSS variables) as your base, then build each
section to its spec — verify every color, radius, and font against these tokens.

Export: Tailwind v4 (@theme)

@theme {
  /* action color #E5F4FF — the one interactive color; buttons/links/emphasis only, never large fills. */
  --color-bg: #030710;
  --color-surface: #10151E;
  --color-border: #242A33;
  --color-text: #E5F4FF;
  --color-text-muted: #8F99A4;
  --color-primary: #CCE9FF;  /* a neutral UI color (chips, tags, icon fills, chrome), not the action color (action = #E5F4FF). */
  --color-accent: #7FC8FF;  /* accent for emphasis — keep it rare on the page. */
  --color-link: #7FC8FF;  /* inline text links and link-styled controls. */
  --color-secondary: #E5F4FF;  /* same color as the action (see accent). */
  --color-button-bg: #E5F4FF;  /* primary-button fill — the main call-to-action color. */
  --color-button-text: #030710;
  /* fonts: Twklausanne may be proprietary — safe free fallback: Newsreader (Google Fonts). Aeonik is proprietary — closest free match: Space Grotesk (Google). Load Space Grotesk; keep Aeonik first so licensed users still get it. */
  --font-heading: "Twklausanne", "Newsreader", system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-body: "Aeonik", "Space Grotesk", system-ui, -apple-system, 'Segoe UI', sans-serif;
  --text-h1: 63px;
  --text-h2: 54px;
  --text-body: 20.25px;
  --radius-base: 18px;
  --radius-button: 7px;
  --spacing-1: 2px;
  --spacing-2: 4px;
  --spacing-3: 6px;
  --spacing-4: 8px;
  --spacing-5: 12px;
  --spacing-6: 16px;
  --spacing-7: 24px;
  --spacing-8: 32px;
}

Export: CSS variables

:root {
  /* action color #E5F4FF — the one interactive color; buttons/links/emphasis only, never large fills. */
  --bg: #030710;
  --surface: #10151E;
  --border: #242A33;
  --text: #E5F4FF;
  --text-muted: #8F99A4;
  --primary: #CCE9FF;  /* a neutral UI color (chips, tags, icon fills, chrome), not the action color (action = #E5F4FF). */
  --accent: #7FC8FF;  /* accent for emphasis — keep it rare on the page. */
  --link: #7FC8FF;  /* inline text links and link-styled controls. */
  --secondary: #E5F4FF;  /* same color as the action (see accent). */
  --button-bg: #E5F4FF;  /* primary-button fill — the main call-to-action color. */
  --button-text: #030710;
  --font-heading: "Twklausanne", "Newsreader", system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-body: "Aeonik", "Space Grotesk", system-ui, -apple-system, 'Segoe UI', sans-serif;
  --radius: 18px;
  --radius-button: 7px;
}
/* fonts: Twklausanne may be proprietary — safe free fallback: Newsreader (Google Fonts). Aeonik is proprietary — closest free match: Space Grotesk (Google). Load Space Grotesk; keep Aeonik first so licensed users still get it. */