Loading...

posthog-ui-skills

Original：🇺🇸 English

Translated

Posthog's UI design system. Use when building interfaces inspired by Posthog's aesthetic - dark mode, Inter font, 4px grid.

3installs

Sourceihlamury/design-skills

Added on2026-02-07

NPX Install

npx skill4agent add ihlamury/design-skills posthog-ui-skills

Tags

Translated version includes tags in frontmatter

posthog-ui design-system ui-guidelines dark-mode typography-specs

SKILL.md Content

View Translation Comparison →

Posthog UI Skills

Opinionated constraints for building Posthog-style interfaces with AI agents.

When to Apply

Reference these guidelines when:

Building dark-mode interfaces
Creating Posthog-inspired design systems
Implementing UIs with Inter font and 4px grid

Colors

MUST use dark backgrounds (lightness < 20) for primary surfaces - detected lightness: 0
MUST use
```
#000000
```
as page background (
```
surface-base
```
)
SHOULD limit color palette to 5 distinct colors
MUST maintain text contrast ratio of at least 4.5:1 for accessibility

Semantic Tokens

Token	HEX	RGB	Usage
`surface-base`	#000000	rgb(0,0,0)	Page background
`surface-raised`	#E38B20	rgb(227,139,32)	Cards, modals, raised surfaces
`text-primary`	#52290C	rgb(82,41,12)	Headings, body text
`text-secondary`	#55554A	rgb(85,85,74)	Secondary, muted text
`border-default`	#C17C25	rgb(193,124,37)	Subtle borders, dividers
`destructive`	#52290C	rgb(82,41,12)	Error states, delete actions
`warning`	#C17C25	rgb(193,124,37)	Warning states, cautions

Typography

MUST use
```
Inter
```
as primary font family
SHOULD use single font family for consistency
MUST use
```
14px
```
/
```
400
```
for primary headings
MUST limit font weights to: regular, light
MUST use
```
text-balance
```
for headings and
```
text-pretty
```
for body text
SHOULD use
```
tabular-nums
```
for numeric data
NEVER modify letter-spacing unless explicitly requested

Text Styles

Style	Font	Size	Weight	Color	Count
`heading-1`	Inter	14px	400	#626257	1
`heading-2`	Inter	13px	300	#545449	1
`heading-3`	Inter	12px	400	#5B5B50	1
`caption`	Inter	11px	400	#58584D	1
`label`	Inter	10px	400	#52290C	1
`label`	Inter	10px	400	#55554A	1
`label`	Inter	10px	400	#56564B	1

Typography Reference

Font Families:

```
Inter
```
(used 7x)

Font Sizes: 10px, 11px, 12px, 13px, 14px

Spacing

MUST use 4px grid for spacing
SHOULD use spacing from scale: 3px, 4px, 9px, 10px
SHOULD use 4px as default gap between elements
NEVER use arbitrary spacing values (use design scale)
SHOULD maintain consistent padding within containers

Borders

MUST use border-radius from scale: 3px
MUST use 1px border width consistently
SHOULD use 3px as default border-radius
NEVER use arbitrary border-radius values (use design scale)
SHOULD use subtle borders (1px) for element separation

Border Radius Reference

Scale: 3px

Layout

MUST design for 1920px base viewport width
SHOULD use consistent element widths: 41px, 24px, 43px, 857px, 12px
NEVER use
```
h-screen
```
, use
```
h-dvh
```
for full viewport height
MUST respect
```
safe-area-inset
```
for fixed elements
SHOULD use
```
size-*
```
for square elements instead of
```
w-*
```
+
```
h-*
```

Detected Layout Patterns

Header: height: 39px
Main Content: width: 1920px, height: 1050px
Main Content: width: 1920px, height: 1043px

Components

Buttons

Variant	Background	Text	Border	Height	Radius
Ghost	transparent	#52290C	none	-	-

Interactive States

Focus

MUST use
```
2px
```
outline with accent color (
```
#5E6AD2
```
)
MUST use
```
2px
```
outline-offset
NEVER remove focus indicators

Hover

Buttons (primary): lighten background by 10%
Buttons (secondary): use
```
#E38B20
```
background
List items: use
```
#E38B20
```
background

Disabled

MUST use
```
opacity: 0.5
```
MUST use
```
cursor: not-allowed
```

Interaction

MUST use an
```
AlertDialog
```
for destructive or irreversible actions
SHOULD use structural skeletons for loading states
MUST show errors next to where the action happens
NEVER block paste in
```
input
```
or
```
textarea
```
elements
MUST add an
```
aria-label
```
to icon-only buttons

Animation

NEVER add animation unless it is explicitly requested
MUST animate only compositor props (
```
transform
```
,
```
opacity
```
)
NEVER animate layout properties (
```
width
```
,
```
height
```
,
```
top
```
,
```
left
```
,
```
margin
```
,
```
padding
```
)
SHOULD use
```
ease-out
```
on entrance animations
NEVER exceed
```
200ms
```
for interaction feedback
SHOULD respect
```
prefers-reduced-motion
```

Performance

NEVER animate large
```
blur()
```
or
```
backdrop-filter
```
surfaces
NEVER apply
```
will-change
```
outside an active animation
NEVER use
```
useEffect
```
for anything that can be expressed as render logic