Design System

Primitive components, tokens, and patterns used across the Express.js website.

All components are imported from @components/primitives.

Typography

Fonts: Helvetica Neue for body and headings, JetBrains Mono for code, Inter (bold) for OG images.

Headings: H1 (page titles), H2 (sections), H3 (subsections), H4 (minor), H5 (lead text).

Body: Body (default), BodyMd (secondary content), BodySm (captions/metadata), BodyXs (fine print).

Code: Code for inline code blocks.

Weights: light (300), normal (400), medium (500), semibold (600), bold (700).

All typography components support as prop for polymorphic rendering (e.g., <H1 as="h2">).

Iconography

Uses astro-icon with Fluent Icons (prefix fluent:).

import {Icon} from "astro-icon/components";
<Icon name="fluent:airplane-24-regular" size="24" />

Color Tokens

Primitives: --white, --black, --gray-{50-950}, --sky-{50,500,700,800}, --green-{50,300,500,700,900}, --amber-{50,300,500,600,700,900}, --red-{50,300,500,600,700,900}.

Semantic (light / dark):

Token	Light	Dark
--color-bg-primary	--white #FFFFFF	--black #000000
--color-bg-secondary	--gray-50 #FAFAFA	--gray-900 #141414
--color-bg-tertiary	--gray-150 #EEEEEE	--gray-800 #262626
--color-bg-inverse	--gray-900 #141414	--gray-100 #F6F6F6
--color-bg-mute	--gray-200 #E5E5E5	--gray-600 #525252
--color-bg-success	--green-50 #F0FDF4	--green-950 #052E16
--color-bg-warning	--amber-50 #FFFBEB	--amber-950 #451A03
--color-bg-error	--red-50 #FEF2F2	--red-950 #450A0A
--color-text-primary	--gray-900 #141414	--gray-100 #F6F6F6
--color-text-secondary	--gray-600 #525252	--gray-150 #EEEEEE
--color-text-tertiary	--gray-500 #737373	--gray-500 #737373
--color-text-inverse	--gray-100 #F6F6F6	--gray-900 #141414
--color-text-mute	--gray-500 #737373	--gray-500 #737373
--color-text-success	--green-700 #15803D	--green-400 #4ADE80
--color-text-warning	--amber-700 #B45309	--amber-400 #FBBF24
--color-text-error	--red-700 #B91C1C	--red-400 #F87171
--color-border-primary	--gray-300 #D4D4D4	--gray-500 #737373
--color-border-secondary	--gray-200 #E5E5E5	--gray-800 #262626
--color-border-tertiary	--gray-400 #A3A3A3	--gray-400 #A3A3A3
--color-border-inverse	--gray-700 #404040	--gray-200 #E5E5E5
--color-border-mute	--gray-300 #D4D4D4	--gray-700 #404040
--color-border-success	--green-200 #BBF7D0	--green-800 #166534
--color-border-warning	--amber-200 #FDE68A	--amber-800 #92400E
--color-border-error	--red-200 #FECACA	--red-800 #991B1B

Colors are defined using OKLCH color space with light-dark() for theme switching.

Spacing

--space-{0.5,1,2,3,4,6,8,12,16} mapping to 2px through 64px.

Type Scale

--font-size-{xs,sm,base,lg,xl,2xl,3xl,4xl,5xl,6xl} mapping to 12px through 54px.

Buttons

<Button> supports variant (primary, secondary), size (md, sm, xs), ghost (transparent bg), disabled, and as="a" for links.

Form Elements

<Select> — custom dropdown with WAI-ARIA support. Variants: default, ghost, minimal, icon. Sizes: sm, md, lg. Emits select-change event.

Grid & Layout

• <Grid> + <Col> — 12-column responsive grid. Props: xs, md, lg, gap.
• <Flex> + <FlexItem> — Flexbox layouts. Props: direction, gap, justify, align, grow, basis.
• <Container> — Centered wrapper (max-width: 1440px).

Breakpoints

Name	Range	Media query
xs	< 768px	--xs-only
md	768px – 1439px	--md-only, --md-up
lg	>= 1440px	--lg-up, --lg-down