Langfuse — decoded design system

langfuse.com · light · modern · tailwind · deep decode — measured live

Langfuse's design system, decoded live by Mozaika: measured color roles, type scale, buttons with real hover/focus states, motion and the brand's own tokens.

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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/decode/langfuse.com.

Decoded design system

Langfuse's decoded design system: background #EDEDE8, text #020817, accent #1863DC, link #3D3D38, primary #1863DC; type scale h1 68px / h2 32px / body 14px; 4px spacing base; 2px base radius. The single interactive/action color is #222220 — used only on interactive or must-notice elements (buttons, links, key highlights), never on large fills.

Color roles

Using these colors

• Action color #222220 — the single interactive color; only on things you click or must notice, never large fills.
• primary, accent are all #1863DC — one role, not several (the action color).
• accent #1863DC — accent for emphasis — keep it rare on the page.
• link #3D3D38 — reads as a neutral UI color, not a link accent — verify against the reference (action = #222220).
• secondary #4E4B66 — optional secondary accent — LOW decode confidence; use rarely (a status color or a single decorative moment) or omit it entirely. Prefer one accent unless the reference clearly shows two.

Typography

• Heading: Inter
• Body: Inter
• Mono: geistMono
• h1: 68px
• h2: 32px
• body: 14px

Spacing

• base unit: 4px
• scale: 3px, 4px, 5px, 6px, 8px, 10px, 12px, 14px, 16px, 18px

Radii

• base: 2px
• button: 2px

Shadow

rgba(0, 0, 0, 0.05) 0px 4px 8px 0px, rgba(0, 0, 0, 0.03) 0px 4px 4px 0px

Shadows (elevation)

• card: rgba(172, 171, 171, 0.3) 0px -1px 10px 0px

Motion

Micro-interactions run at 150ms (dominant) with ease.

• durations: 150ms · 180ms · 200ms
• easings: ease · cubic-bezier(0.4, 0, 0.2, 1)
• animated properties: border-color, color, background-color, outline-color

Native design tokens

…and 110 more measured on the page.

Layout (measured)

• container max-width: 840px
• nav: 60px sticky, backdrop blur(12px)
• common grid: 2 columns

Motion choreography (measured)

Load order: p.font-sans×4 → div.flex×2 → div.flex×2 → div.group → section.mx-auto×2 → a.focus-visible:outline-no

Scroll reveal: 6 elements rest at opacity 0, animate in over 0.7s ease.

Responsive (measured)

• breakpoints: 768px · 1012px · 1400px
• mobile (390px): hero 32px · nav inline

Install it

Drop this measured system into any shadcn/Tailwind project in one command:

npx shadcn add mozaika.design/r/decode/langfuse.com

registry item · or query it over MCP: get_design_system("Langfuse")

Export: DESIGN.md

# Langfuse — Design System

> light, modern, medium, tailwind — deep decode (measured live)

## Colors

| Role | Value |
|------|-------|
| bg | `#EDEDE8` |
| surface | `#DEDFDB` |
| border | `#C9CAC8` |
| text | `#020817` |
| text_muted | `#5B5F66` |
| primary | `#1863DC` |
| accent | `#1863DC` |
| link | `#3D3D38` |
| secondary | `#4E4B66` |
| button_bg | `#222220` |
| button_text | `#F6F6F3` |

**Using these colors**

- **Action color** `#222220` — the single interactive color; it appears only on things you click or must notice (buttons, key highlights), never on large fills or backgrounds.
- `primary`, `accent` are all `#1863DC` — one role, not several.
- **accent** `#1863DC` — accent for emphasis — keep it rare on the page.
- **link** `#3D3D38` — reads as a neutral UI color, not a link accent — verify against the reference (action = #222220).
- **secondary** `#4E4B66` — optional secondary accent — LOW decode confidence; use rarely (a status color or a single decorative moment) or omit it entirely. Prefer one accent unless the reference clearly shows two.
- **Page coverage** (full-page screenshot pixels): `#EDEDE8` 83.3% · `#B7BBB8` 8.3% · `#FCFCFB` 5.8% · `#EBEE92` 2.7%

## Typography

- Heading: **Inter**
- Body: **Inter**
- Mono: **geistMono** _(measured)_

| Role | Size / weight · line-height · tracking |
|------|------------------------------------------|
| hero | 68px / 500 · lh 71px |
| h2 | 32px / 500 · lh 37px |
| h3 | 20px / 500 · lh 28px |
| body | 14px / 430 · lh 17px · tracking -0.26px |
| small | 13px / 400 · lh 13px |

- Weight ladder: 400 · 430 · 450 · 500 · 600 — use these exact measured weights, not the 400/600 defaults.

> **Fonts —** Inter — free, on Google.

## Spacing
- base unit: 4px (inferred from the measured scale)
- measured scale: 3px, 4px, 5px, 6px, 8px, 10px, 12px, 14px, 16px, 18px — snap all gaps/padding to these
- section rhythm: 120px top/bottom padding per section (measured)

## Radius
- base: 2px
- button: 2px
- card: 4px
- pill: 9999px
- sharp: 2px

## Buttons

| Button | Fill / text | Border | Radius | Padding | Font | Shadow |
|--------|-------------|--------|--------|---------|------|--------|
| primary | `#222220` / `#F6F6F3` | 1px solid rgb(61, 61, 56) | 2px | 3px 3px 3px 8px | 400 16px | rgba(0, 0, 0, 0.05) 0px 4px 8px 0px, rgba(0, 0, 0, 0.03) 0px 4px 4px 0px |
| secondary | `#F6F6F3` / `#3D3D38` | 1px solid rgb(207, 207, 201) | 2px | 3px 3px 3px 8px | 400 16px | rgba(0, 0, 0, 0.05) 0px 4px 8px 0px, rgba(0, 0, 0, 0.03) 0px 4px 4px 0px |

**States (measured, not guessed)**

- secondary hover: border `1px solid rgb(64, 64, 57)`
- transition: `color 0.15s cubic-bezier(0.4, 0, 0.2, 1)`

## Shadows (elevation)
- card: `rgba(172, 171, 171, 0.3) 0px -1px 10px 0px`
- button: `rgba(0, 0, 0, 0.05) 0px 4px 8px 0px, rgba(0, 0, 0, 0.03) 0px 4px 4px 0px`

## Motion
- durations: 150ms (dominant) · 180ms · 200ms
- easings: `ease` (dominant) · `cubic-bezier(0.4, 0, 0.2, 1)`
- animated properties: border-color, color, background-color, outline-color

Micro-interactions use the dominant duration + easing; nothing on the page animates slower than the longest duration above — don't invent springier motion.

## Their own tokens (verbatim from :root)

| Token | Value |
|-------|-------|
| `--color-purple-200` | `lab(87.8405% 13.4282 -18.7159)` |
| `--text-code-orange` | `#c17e2e` |
| `--color-rose-200` | `lab(86.806% 19.1909 4.07754)` |
| `--color-slate-200` | `lab(91.7353% -.998765 -4.76968)` |
| `--color-orange-600` | `lab(57.1026% 64.2584 89.8886)` |
| `--color-red-900` | `lab(28.5139% 44.5539 29.0463)` |
| `--color-orange-800` | `lab(37.1566% 46.6433 50.5562)` |
| `--color-fd-secondary` | `#ededed` |
| `--color-purple-800` | `lab(30.6017% 56.7637 -64.4751)` |
| `--color-orange-900` | `lab(30.2951% 36.0434 37.671)` |
| `--color-blue-300` | `lab(77.5052% -6.4629 -36.42)` |
| `--color-text-secondary` | `#3d3d38` |

_…and 108 more measured on the page._

Prefer these names when extending their system — it's the brand's actual vocabulary.

## Layout (measured)
- container max 840px · common grid: 2-col
- nav: 60px sticky · backdrop blur(12px) · bg #EDEDE8

| Section (y) | Height | Cols | Gap | Pad y | Split |
|---|---|---|---|---|---|
| 659 | 671 | — | — | 120/0 | — |
| 1330 | 858 | — | — | 120/0 | — |
| 2188 | 926 | — | — | 120/0 | — |
| 3113 | 758 | 2 | 10 | 120/0 | — |
| 3871 | 541 | 2 | — | 120/0 | — |
| 4412 | 715 | 2 | — | 120/0 | — |

## Motion choreography (measured)
Load order: `p.font-sans`×4 @0ms → `div.flex`×2 @0ms → `div.flex`×2 @0ms → `div.group` @0ms → `section.mx-auto`×2 @1429ms → `` @1429ms
- `p.font-sans` ×2 — opacity 0→1 · transform translateY(6px)→translateY(0px) — 200ms cubic-bezier(0.16, 1, 0.3, 1)
- scroll reveal: 6 elements rest at opacity 0, animate in over 0.7s ease (6 revealed during the drive).

Rebuild the timeline, not just the durations — order, delays and staggers above are the choreography.

## Components (measured)
- card ×3: pad 0px 0px 0px 0px · r 2px · border 1px solid rgb(207, 207, 201) · bg #F6F6F3
  - hover: background `rgba(0, 0, 0, 0)` · font-weight `400` · letter-spacing `normal`
- link: #020817 · no underline

## Responsive (measured)
- breakpoints: 768px · 1012px · 1400px
- mobile (390px): hero 32px · body 14px · nav: inline

## 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.
Hover/focus states, shadows and motion timings above are measured from the live page — match them exactly, don't re-guess them.

← All decoded design systems

An automated reading of Langfuse's publicly-visible CSS (colors, fonts, spacing, motion) — not affiliated with langfuse.com. No screenshots stored. Removal requests: hello@mozaika.design.