SST — decoded design system

sst.dev · light · modern · custom · deep decode — measured live

SST'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/sst.dev.

Decoded design system

SST's decoded design system: background #FFFFFF, text #303055, accent #303055, link #303055, primary #5196B3; type scale h1 48px / h2 48px / body 20px; 4px spacing base; 0px base radius. The single interactive/action color is #FFFFFF — used only on interactive or must-notice elements (buttons, links, key highlights), never on large fills.

Color roles

Using these colors

• Action color #FFFFFF — the single interactive color; only on things you click or must notice, never large fills.
• accent, link are all #303055 — one role, not several (the action color).
• accent #303055 — accent for emphasis — keep it rare on the page.
• primary #5196B3 — a brand color — but the call-to-action uses #FFFFFF, not this.
• secondary #0000EE — 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: Rubik
• Body: Arial
• Mono: IBM Plex Mono
• h1: 48px
• h2: 48px
• body: 20px

Spacing

• base unit: 4px
• scale: 3px, 5px, 6px, 7px, 10px, 12px, 13px, 15px, 16px, 24px

Radii

• base: 0px
• button: 0px

Motion

Micro-interactions run at 250ms (dominant) with ease.

• durations: 250ms
• easings: ease
• animated properties: color

Native design tokens

…and 109 more measured on the page.

Button states (measured)

• primary hover: color #5196B3
• primary focus: outline 1px auto rgb(16, 16, 16)

Layout (measured)

• container max-width: 840px
• nav: 64px fixed, backdrop blur(8px)

Overlay recipe (measured)

dialog panel: rgba(247, 247, 247, 0.93) · radius 10px · enter 200ms linear

Responsive (measured)

• breakpoints: 480px · 800px · 1152px
• mobile (390px): hero 48px · nav inline

Install it

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

npx shadcn add mozaika.design/r/decode/sst.dev

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

Export: DESIGN.md

# SST — Design System

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

## Colors

| Role | Value |
|------|-------|
| bg | `#FFFFFF` |
| surface | `#F2F2F4` |
| border | `#DFDFE5` |
| text | `#303055` |
| text_muted | `#7E7E95` |
| primary | `#5196B3` |
| accent | `#303055` |
| link | `#303055` |
| secondary | `#0000EE` |
| button_bg | `#FFFFFF` |
| button_text | `#767682` |

**Using these colors**

- **Action color** `#FFFFFF` — 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 `#303055` — one role, not several.
- **accent** `#303055` — accent for emphasis — keep it rare on the page.
- **primary** `#5196B3` — a brand color — but the call-to-action uses #FFFFFF, not this.
- **secondary** `#0000EE` — 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): `#FFFFFF` 96.3% · `#D1D0D8` 3.7%

## Typography

- Heading: **Rubik** _(free fallback: Newsreader)_
- Body: **Arial**
- Mono: **IBM Plex Mono** _(measured)_

| Role | Size / weight · line-height · tracking |
|------|------------------------------------------|
| hero | 48px / 600 · lh 53px · tracking -1px |
| body | 20px / 400 · lh 30px |
| small | 18px / 400 · lh 32px |
| eyebrow | 9px / 500 · tracking 0.5px |

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

> **Fonts —** Rubik may be proprietary — safe free fallback: Newsreader (Google Fonts). Arial — system font, no web load needed.

## Spacing
- base unit: 4px (inferred from the measured scale)
- measured scale: 3px, 5px, 6px, 7px, 10px, 12px, 13px, 15px, 16px, 24px — snap all gaps/padding to these

## Radius
- base: 0px
- button: 0px
- card: 4px
- sharp: 2px

## Buttons

| Button | Fill / text | Border | Radius | Padding | Font | Shadow |
|--------|-------------|--------|--------|---------|------|--------|
| primary | `rgba(0, 0, 0, 0)` / `rgba(26, 26, 46, 0.38)` | none | 0px | 0px 0px 0px 0px | 400 14px | none |
| secondary | `rgba(255, 255, 255, 0.8)` / `rgba(26, 26, 46, 0.6)` | 1px solid rgb(232, 232, 242) | 4px 0px 0px 4px | 1px 10px 1px 10px | 400 13px | none |

**States (measured, not guessed)**

- primary hover: color `#5196B3`
- primary focus: outline `1px auto rgb(16, 16, 16)`
- transition: `color 0.25s ease`

## Motion
- durations: 250ms (dominant)
- easings: `ease` (dominant)
- animated properties: 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 |
|-------|-------|
| `--sl-color-accent-low` | `hsl(198, 39%, 84%)` |
| `--sl-color-accent` | `hsl(198, 39%, 51%)` |
| `--sl-color-accent-high` | `hsl(198, 39%, 27%)` |
| `--sl-color-white` | `hsl(240, 28%, 14%)` |
| `--sl-color-gray-1` | `hsl(240, 28%, 19%)` |
| `--sl-color-gray-2` | `hsl(240, 28%, 26%)` |
| `--sl-color-gray-3` | `hsl(240, 28%, 39%)` |
| `--sl-color-gray-4` | `hsl(240, 28%, 59%)` |
| `--sl-color-gray-5` | `hsl(240, 28%, 81%)` |
| `--sl-color-gray-6` | `hsl(240, 28%, 93%)` |
| `--sl-color-black` | `hsl(255, 100%, 100%)` |
| `--sl-color-black-alpha` | `hsl(255, 100%, 100%, 80%)` |

_…and 107 more measured on the page._

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

## Layout (measured)
- container max 840px
- nav: 64px fixed · backdrop blur(8px) · border-bottom 1px solid rgb(232, 232, 242) · bg rgba(255, 255, 255, 0.8)

| Section (y) | Height | Cols | Gap | Pad y | Split |
|---|---|---|---|---|---|
| 64 | 836 | — | — | 0/0 | — |

## Motion choreography (measured)
- overlay dialog (auto-opened): panel rgba(247, 247, 247, 0.93) · r 10px · shadow 
  - enter: transform+opacity from scale(0.9),0 · 200ms linear | opacity from 0 · 200ms linear

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

## Components (measured)
- link: rgba(26, 26, 46, 0.38) · no underline — hover #5196B3

## Responsive (measured)
- breakpoints: 480px · 800px · 1152px
- mobile (390px): hero 48px · body 16px · 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.

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