LangChain — design system & UI screens

AI · 1 screen · 13 sections · https://www.langchain.com/

Dark hero with a luminous branching tree diagram tracing Build to Test to Deploy to Monitor; LangSmith positioning in minimal centered type over black.

Open in Mozaika →

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

Decoded design system

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: 8px, 10px, 12px, 16px, 18px, 20px, 22px, 24px, 32px, 43px

Radii

base: 18px
button: 7px

Shadows (elevation)

overlay: rgba(127, 200, 255, 0.5) 0px 0px 32px 0px

Motion

Micro-interactions run at 300ms (dominant) with ease.

durations: 300ms · 200ms · 500ms
easings: ease · ease-out
animated properties: opacity

Native design tokens

Token	Value
`--colors--violet--violet-100`	`#f8f7ff`
`--colors--green--green-400`	`#1d3d3c`
`--dark--button-text`	`#1d3d3c`
`--colors--blue--blue-500`	`#043e5d`
`--colors--green--green-300`	`#8b9c9c`
`--colors--violet--violet-400`	`#beb4fd`
`--nav--button-text`	`#1d3d3c`
`--colors--violet--violet-300`	`#cfc8fe`
`--red--button-text`	`#772730`
`--colors--green--green-100`	`#e9ecec`

…and 44 more measured on the page.

Button states (measured)

primary hover: box-shadow rgba(127, 200, 255, 0.4) 0px 0px 20px 4px
primary focus: outline 1px auto rgb(16, 16, 16)

Layout (measured)

container max-width: 1416px
nav: 72px sticky

Motion choreography (measured)

Load order: a.swiper-slide×10 → h1.t-heading-1-rg → a.banner-link → a.banner-link → div.embed-icon×9 → a.navbar2_logo-link

Responsive (measured)

breakpoints: 479px · 767px · 992px
mobile (390px): hero 36px · nav hamburger

Full design system, per-section tokens & DESIGN.md / Tailwind / CSS exports →

Screens

LangChain - Powering the Agent Development Lifecycle