Replit UI Skills

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

When to Apply

Reference these guidelines when:

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

Colors

SHOULD use light backgrounds for primary surfaces
MUST use
```
#F8F8F8
```
as page background (
```
surface-base
```
)
MUST use
```
#9266E6
```
for primary actions and focus states (
```
accent
```
)
SHOULD reduce color palette (currently 26 colors detected)
MUST maintain text contrast ratio of at least 4.5:1 for accessibility

Semantic Tokens

Token	HEX	RGB	Usage
`surface-base`	#F8F8F8	rgb(248,248,248)	Page background
`surface-raised`	#1C4B39	rgb(28,75,57)	Cards, modals, raised surfaces
`surface-overlay`	#E1EAE7	rgb(225,234,231)	Overlays, tooltips, dropdowns
`text-primary`	#769E8E	rgb(118,158,142)	Headings, body text
`text-secondary`	#8F9A96	rgb(143,154,150)	Secondary, muted text
`text-tertiary`	#BBBFBB	rgb(187,191,187)	Additional text
`border-default`	#EEEEEE	rgb(238,238,238)	Subtle borders, dividers
`accent`	#9266E6	rgb(146,102,230)	Primary actions, links, focus
`destructive`	#DE4409	rgb(222,68,9)	Error states, delete actions

Typography

MUST use
```
Inter
```
as primary font family
SHOULD use single font family for consistency
MUST use
```
31px
```
/
```
semi_bold
```
for primary headings
MUST use
```
13px
```
/
```
400
```
for body text
SHOULD reduce font weights (currently 4 detected)
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	31px	semi_bold	#3D3D3D	1
`heading-2`	Inter	30px	500	#434B46	1
`text-22px`	Inter	22px	500	#515152	1
`text-18px`	Inter	18px	500	#333333	1
`text-15px`	Inter	15px	400	#A7A7AA	1
`text-14px`	Inter	14px	400	#6D6F6E	1
`text-14px`	Inter	14px	300	#616362	1
`text-14px`	Inter	14px	400	#909194	1
`text-14px`	Inter	14px	300	#7A7A7B	1
`text-14px`	Inter	14px	400	#757575	1

Typography Reference

Font Families:

```
Inter
```
(used 64x)

Font Sizes: 3px, 4px, 5px, 6px, 7px, 8px, 11px, 13px, 14px, 15px, 18px, 22px, 30px, 31px

Spacing

MUST use 4px grid for spacing
SHOULD use spacing from scale: 1px, 2px, 3px, 4px, 5px, 8px, 12px, 13px
SHOULD use 2px 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: 0px, 1px, 2px, 3px, 4px, 5px, 6px, 7px, 9px, 10px, 13px, 15px, 16px, 18px, 45px
SHOULD use 45px+ radius for pill-shaped elements
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: 0px, 1px, 2px, 3px, 4px, 5px, 6px, 7px, 9px, 10px, 13px, 15px, 16px, 18px, 45px

Layout

MUST design for 1920px base viewport width
SHOULD use consistent element widths: 14px, 6px, 10px, 4px, 21px
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-*
```

Components

Buttons

Variant	Background	Text	Border	Height	Radius
Ghost	transparent	#769E8E	none	-	-

Interactive States

Focus

MUST use
```
2px
```
outline with accent color (
```
#9266E6
```
)
MUST use
```
2px
```
outline-offset
NEVER remove focus indicators

Hover

Buttons (primary): lighten background by 10%
Buttons (secondary): use
```
#1C4B39
```
background
List items: use
```
#1C4B39
```
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

replit-ui-skills

NPX Install

Tags

SKILL.md Content