StackBlitz — decoded design system

stackblitz.com · dark · modern · custom · deep decode — measured live

StackBlitz'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.

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/decode/stackblitz.com.

Decoded design system

StackBlitz's decoded design system: background #1C1F25, text #000000, accent #1574EF, link #A1A5B0, primary #A1A5B0; type scale h1 94px / h2 72px / body 16px; 4px spacing base; 8px base radius. The single interactive/action color is #1574EF — used only on interactive or must-notice elements (buttons, links, key highlights), never on large fills.

Color roles

Using these colors

• Action color #1574EF — the single interactive color; only on things you click or must notice, never large fills.
• primary, link are all #A1A5B0 — one role, not several (the action color).
• accent, button_bg are all #1574EF — one role, not several (the action color).
• accent #1574EF — THE accent / action color — interactive & must-notice only (buttons, links, focus, one key highlight); never large fills or backgrounds. Scarcity is what makes it read as designed.
• secondary #212633 — 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: Manrope
• Body: Inter
• Mono: PT Mono
• h1: 94px
• h2: 72px
• body: 16px

Spacing

• base unit: 4px
• scale: 8px, 16px, 18px, 20px, 24px, 26px, 28px, 32px, 36px, 52px

Radii

• base: 8px
• button: 10px

Shadow

rgba(255, 255, 255, 0.14) 0px 0px 0px 1px inset

Shadows (elevation)

• subtle: rgba(255, 255, 255, 0.1) 0px 0px 0px 1px
• card: rgba(255, 255, 255, 0.1) 0px 1px 0px 0px

Motion

Micro-interactions run at 100ms (dominant) with ease.

• durations: 100ms · 1200ms · 160ms
• easings: ease
• animated properties: color, background-color, opacity, height

Native design tokens

…and 110 more measured on the page.

Button states (measured)

• primary hover: box-shadow rgba(255, 255, 255, 0.24) 0px 0px 0px 1px inset · background #0F8FFF

Layout (measured)

• nav: 72px sticky
• common grid: 2 columns

Motion choreography (measured)

Load order: div._mockEditor__file_explor → div._mockEditor__codeTermina → div._mockEditor__codeConsole

Scroll reveal: 5 elements rest at translateY(2px), animate in over 0.8s ease.

Responsive (measured)

• breakpoints: 500px · 640px · 860px · 1024px · 1280px
• mobile (390px): hero 34px · nav hamburger

Install it

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

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

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

Export: DESIGN.md

# StackBlitz — Design System

> dark, modern, high, custom — deep decode (measured live)

## Colors

| Role | Value |
|------|-------|
| bg | `#1C1F25` |
| surface | `#1A1D22` |
| border | `#171A1F` |
| text | `#000000` |
| text_muted | `#0A0B0E` |
| primary | `#A1A5B0` |
| accent | `#1574EF` |
| link | `#A1A5B0` |
| secondary | `#212633` |
| button_bg | `#1574EF` |
| button_text | `#FFFFFF` |

**Using these colors**

- **Action color** `#1574EF` — the single interactive color; it appears only on things you click or must notice (buttons, key highlights), never on large fills or backgrounds.
- `primary`, `link` are all `#A1A5B0` — one role, not several.
- `accent`, `button_bg` are all `#1574EF` — one role, not several (your action color).
- **accent** `#1574EF` — THE accent / action color — interactive & must-notice only (buttons, links, focus, one key highlight); never large fills or backgrounds. Scarcity is what makes it read as designed.
- **secondary** `#212633` — 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): `#1C1F25` 92.9% · `#505B68` 7.1%

## Typography

- Heading: **Manrope**
- Body: **Inter**
- Mono: **PT Mono** _(measured)_

| Role | Size / weight · line-height · tracking |
|------|------------------------------------------|
| hero | 94px / 600 · lh 94px · tracking -2px |
| h2 | 72px / 800 · lh 76px · tracking -3px |
| h3 | 40px / 400 · lh 48px · tracking -0.5px |
| body | 16px / 600 · lh 32px |
| small | 15px / 700 · lh 18px |

- Weight ladder: 400 · 500 · 600 · 700 · 800 — use these exact measured weights, not the 400/600 defaults.

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

## Spacing
- base unit: 4px (inferred from the measured scale)
- measured scale: 8px, 16px, 18px, 20px, 24px, 26px, 28px, 32px, 36px, 52px — snap all gaps/padding to these
- section rhythm: 120px top/bottom padding per section (measured)

## Radius
- base: 8px
- button: 10px
- card: 6px

## Buttons

| Button | Fill / text | Border | Radius | Padding | Font | Shadow |
|--------|-------------|--------|--------|---------|------|--------|
| primary | `#1574EF` / `#FFFFFF` | none | 10px | 0px 32px 0px 32px | 500 16px | rgba(255, 255, 255, 0.14) 0px 0px 0px 1px inset |
| secondary | `rgba(49, 61, 94, 0.24)` / `rgba(255, 255, 255, 0.8)` | none | 8px | 0px 20px 0px 20px | 500 13px | rgba(255, 255, 255, 0.08) 0px 0px 0px 1px inset |

**States (measured, not guessed)**

- primary hover: box-shadow `rgba(255, 255, 255, 0.24) 0px 0px 0px 1px inset` · background `#0F8FFF`
- secondary hover: box-shadow `rgba(255, 255, 255, 0.14) 0px 0px 0px 1px inset` · background `rgba(49, 61, 94, 0.54)` · color `#FFFFFF`
- transition: `background-color 0.1s ease`

## Shadows (elevation)
- subtle: `rgba(255, 255, 255, 0.1) 0px 0px 0px 1px`
- card: `rgba(255, 255, 255, 0.1) 0px 1px 0px 0px`
- button: `rgba(255, 255, 255, 0.14) 0px 0px 0px 1px inset`

## Motion
- durations: 100ms (dominant) · 1200ms · 160ms
- easings: `ease` (dominant)
- animated properties: color, background-color, opacity, height

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 |
|-------|-------|
| `--sb-foreground-alt` | `hsl(0 0% 62%)` |
| `--sb-foreground-active` | `hsl(0 0% 94%)` |
| `--public-blue-text-10` | `#69f5ff` |
| `--public-blue-text-20` | `#4cedff` |
| `--public-blue-text-50` | `#00A8DB` |
| `--public-blue-text-60` | `#00aeda` |
| `--public-blue-text-neutral` | `#1b82bc` |
| `--public-blue-text-bright-light` | `#96f8ff` |
| `--public-blue-text-bright-dark` | `#00a3cc` |
| `--public-blue-text-secondary` | `#69b6dd` |
| `--public-blue-bg-lighter` | `#fbfeff` |
| `--public-blue-bg-light` | `#f1f4f8` |

_…and 108 more measured on the page._

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

## Layout (measured)
- common grid: 2-col
- nav: 72px sticky

| Section (y) | Height | Cols | Gap | Pad y | Split |
|---|---|---|---|---|---|
| 1852 | 1367 | 2 | 100 | 120/120 | — |
| 1972 | 277 | — | — | 0/0 | — |
| 2249 | 268 | 2 | 100 | 72/0 | — |
| 2517 | 582 | 2 | 100 | 72/0 | — |
| 3219 | 554 | — | — | 180/180 | — |

## Motion choreography (measured)
Load order: `div._mockEditor__file_explor` @0ms → `div._mockEditor__codeTermina` @0ms → `div._mockEditor__codeConsole` @0ms
- scroll reveal: 5 elements rest at translateY(2px), animate in over 0.8s ease (5 revealed during the drive).

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

## Responsive (measured)
- breakpoints: 500px · 640px · 860px · 1024px · 1280px
- mobile (390px): hero 34px · body 16px · nav: hamburger

## 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.

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