MozaikaDesign system

StackBlitz — Design System

dark · modern · high · custom · confidence 92% · deep decode

StackBlitz (now the house of Bolt) sets 94px/600 Manrope with highlighted keyword chips inside the headline, on gunmetal #1C1F25 with blue #1574EF 10px-radius buttons. WebContainers diagrams and editor frames carry the engineering story — browser-native dev tooling with its headline typeset like annotated code.

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/ds/stackblitz.

Tokens

StackBlitz's decoded design system: background #1C1F25, text #A1A5B0, accent #1574EF, link #1574EF, primary #A1A5B0; type scale h1 94px / h2 94px / body 18px; 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

RoleValue
bg#1C1F25
surface#23272D
border#2F3339
text#A1A5B0
text_muted#6E727B
primary#A1A5B0
accent#1574EF
link#1574EF
secondary#212633
button_bg#1574EF
button_text#FFFFFF

Using these colors

Typography

Spacing

Radii

Shadow

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

Shadows (elevation)

Motion

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

Native design tokens

TokenValue
--sb-foreground-althsl(0 0% 62%)
--sb-foreground-activehsl(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

…and 110 more measured on the page.

Button states (measured)

Layout (measured)

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)

Per-section tokens (7)

Export: DESIGN.md

# StackBlitz — Design System

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

StackBlitz (now the house of Bolt) sets 94px/600 Manrope with highlighted keyword chips inside the headline, on gunmetal #1C1F25 with blue #1574EF 10px-radius buttons. WebContainers diagrams and editor frames carry the engineering story — browser-native dev tooling with its headline typeset like annotated code.

## Colors

| Role | Value |
|------|-------|
| bg | `#1C1F25` |
| surface | `#23272D` |
| border | `#2F3339` |
| text | `#A1A5B0` |
| text_muted | `#6E727B` |
| primary | `#A1A5B0` |
| accent | `#1574EF` |
| link | `#1574EF` |
| 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.
- `accent`, `link`, `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.
- **primary** `#A1A5B0` — ≈ the text color — a foreground/text color, not an action color (action = #1574EF).
- **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.

---

> **Decoded with Mozaika** — measured live, not guessed. Full decoded design system + one-command install: mozaika.design/ds/stackblitz

Export: Tailwind v4 (@theme)

@theme {
  /* action color #1574EF — the one interactive color; buttons/links/emphasis only, never large fills. */
  --color-bg: #1C1F25;
  --color-surface: #23272D;
  --color-border: #2F3339;
  --color-text: #A1A5B0;
  --color-text-muted: #6E727B;
  --color-primary: #A1A5B0;  /* ≈ the text color — a foreground/text color, not an action color (action = #1574EF). */
  --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. */
  --color-link: #1574EF;  /* inline text links — shares the action color. */
  --color-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. */
  --color-button-bg: #1574EF;  /* primary-button fill — the main call-to-action color. */
  --color-button-text: #FFFFFF;
  /* fonts: Manrope — free, on Google. Inter — free, on Google. */
  --font-heading: "Manrope", system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-body: "Inter", system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono: "PT Mono", ui-monospace, monospace;
  /* measured weights: 400, 500, 600, 700, 800 — use these, not 400/600 */
  --text-hero: 94px; --font-weight-hero: 600; --leading-hero: 94px; --tracking-hero: -2px;
  --text-h2: 72px; --font-weight-h2: 800; --leading-h2: 76px; --tracking-h2: -3px;
  --text-h3: 40px; --font-weight-h3: 400; --leading-h3: 48px; --tracking-h3: -0.5px;
  --text-body: 16px; --font-weight-body: 600; --leading-body: 32px;
  --text-small: 15px; --font-weight-small: 700; --leading-small: 18px;
  --radius-base: 8px;
  --radius-button: 10px;
  --radius-card: 6px;
  --shadow-card: rgba(255, 255, 255, 0.1) 0px 1px 0px 0px;
  --shadow-subtle: rgba(255, 255, 255, 0.1) 0px 0px 0px 1px;
  --color-btn-hover: #0F8FFF;  /* measured primary hover fill */
  --ease-brand: ease;
  --duration-fast: 100ms;  /* use: duration-[var(--duration-fast)] */
  --duration-base: 160ms;
  --duration-slow: 1200ms;
  --section-y: 120px;  /* per-section vertical padding (measured) */
  --spacing: 4px;  /* measured base — drives the p-*/gap-* scale. steps seen on the page: 8, 16, 18, 20, 24, 26, 28, 32, 36, 52px */
}

Export: CSS variables

:root {
  /* action color #1574EF — the one interactive color; buttons/links/emphasis only, never large fills. */
  --bg: #1C1F25;
  --surface: #23272D;
  --border: #2F3339;
  --text: #A1A5B0;
  --text-muted: #6E727B;
  --primary: #A1A5B0;  /* ≈ the text color — a foreground/text color, not an action color (action = #1574EF). */
  --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. */
  --link: #1574EF;  /* inline text links — shares the action color. */
  --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. */
  --button-bg: #1574EF;  /* primary-button fill — the main call-to-action color. */
  --button-text: #FFFFFF;
  --font-heading: "Manrope", system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-body: "Inter", system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono: "PT Mono", ui-monospace, monospace;
  --text-hero: 94px; --weight-hero: 600; --leading-hero: 94px; --tracking-hero: -2px;
  --text-h2: 72px; --weight-h2: 800; --leading-h2: 76px; --tracking-h2: -3px;
  --text-h3: 40px; --weight-h3: 400; --leading-h3: 48px; --tracking-h3: -0.5px;
  --text-body: 16px; --weight-body: 600; --leading-body: 32px;
  --text-small: 15px; --weight-small: 700; --leading-small: 18px;
  --radius: 8px;
  --radius-button: 10px;
  --radius-card: 6px;
  --shadow-card: rgba(255, 255, 255, 0.1) 0px 1px 0px 0px;
  --shadow-subtle: rgba(255, 255, 255, 0.1) 0px 0px 0px 1px;
  --btn-bg-hover: #0F8FFF;
  --ease: ease;
  --duration-fast: 100ms;
  --duration-base: 160ms;
  --duration-slow: 1200ms;
  --section-y: 120px;
}

/* their own tokens, verbatim from the site's :root */
:root {
  --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;
}
/* fonts: Manrope — free, on Google. Inter — free, on Google. */