Are the ai2 Accent collapsibles free?

Yes. The whole styled layer is free and MIT licensed, like the component core.

Can I change the size?

Yes. Every variation takes a size prop of sm, md, lg or xl, aligned to the base Button height scale.

Accent collapsibles

Five collapsibles led by a primary left bar that grows or brightens as the panel opens: bar, grow, glow, left and full. Each toggles a token content panel with an accessible trigger and is sized.

CollapsibleAccent

Installation

The styled layer is free and installs like any other ai2 component.

Run the following command

npx shadcn@latest add @ai2/collapsible-accent

Dependencies, the @ai2/tokens theme and the component file are installed together.

Install dependencies

npm install motion lucide-react

Copy the source

components/ui/collapsible-accent.tsx

"use client"

import * as React from "react"
import { ChevronDown } from "lucide-react"
import { AnimatePresence, motion, useReducedMotion } from "motion/react"

import { cn } from "@/lib/utils"

/* Accent collapsible family: 5 collapsibles with a primary left bar. Each export
   is a complete collapsible: a single trigger + a single expanding body, a button
   with aria-expanded, and a framer height auto animation. Works controlled
   (open/onOpenChange) and uncontrolled (defaultOpen). The difference is on the
   LEFT BAR: a primary line that grows or glows while open (Bar, Grow, Glow, Left,
   Full). Color comes ONLY from tokens. Alpha via color-mix. No transform under
   reduced-motion. Size = padding + text scale. */

export type StyledSize = "sm" | "md" | "lg" | "xl"

interface StyledCollapsibleProps {
  className?: string
  size?: StyledSize
  title?: React.ReactNode
  children?: React.ReactNode
  open?: boolean
  defaultOpen?: boolean
  onOpenChange?: (o: boolean) => void
}

const headerPad: Record<StyledSize, string> = {
  sm: "px-3 py-2.5 text-sm",
  md: "px-4 py-3 text-sm",
  lg: "px-5 py-4 text-base",
  xl: "px-6 py-5 text-lg",
}

const bodyPad: Record<StyledSize, string> = {
  sm: "px-3 pb-2.5 text-sm",
  md: "px-4 pb-3 text-sm",
  lg: "px-5 pb-4 text-base",
  xl: "px-6 pb-5 text-base",
}

const iconSize: Record<StyledSize, string> = {
  sm: "size-4",
  md: "size-4",
  lg: "size-5",
  xl: "size-5",
}

const headerBase =
  "flex w-full items-center justify-between gap-3 text-left font-medium outline-none transition-colors focus-visible:ring-[3px] focus-visible:ring-ring/50"

const defaultTitle = "What is included?"

const defaultChildren =
  "Every plan ships the full component library, semantic tokens, and lifetime updates for the tier you own. Add any component with a single CLI command and keep the files fully editable."

/* Controlled and uncontrolled open state in a single hook. */
function useControllableOpen({
  open,
  defaultOpen,
  onOpenChange,
}: {
  open?: boolean
  defaultOpen?: boolean
  onOpenChange?: (o: boolean) => void
}) {
  const isControlled = open !== undefined
  const [internal, setInternal] = React.useState<boolean>(defaultOpen ?? false)
  const current = isControlled ? (open as boolean) : internal
  const toggle = React.useCallback(() => {
    const next = !current
    if (!isControlled) setInternal(next)
    onOpenChange?.(next)
  }, [current, isControlled, onOpenChange])
  return { isOpen: current, toggle }
}

function Chevron({ isOpen, size }: { isOpen: boolean; size: StyledSize }) {
  const reduce = useReducedMotion()
  return (
    <motion.span
      aria-hidden
      className="shrink-0 text-muted-foreground"
      animate={reduce ? undefined : { rotate: isOpen ? 180 : 0 }}
      transition={reduce ? { duration: 0 } : { type: "spring" as const, stiffness: 300, damping: 24 }}
    >
      <ChevronDown className={iconSize[size]} />
    </motion.span>
  )
}

function Panel({
  isOpen,
  size,
  children,
}: {
  isOpen: boolean
  size: StyledSize
  children: React.ReactNode
}) {
  const reduce = useReducedMotion()
  return (
    <AnimatePresence initial={false}>
      {isOpen && (
        <motion.div
          key="panel"
          initial={reduce ? false : { height: 0, opacity: 0 }}
          animate={{ height: "auto", opacity: 1 }}
          exit={{ height: 0, opacity: 0 }}
          transition={
            reduce ? { duration: 0 } : { duration: 0.25, ease: [0.4, 0, 0.2, 1] }
          }
          className="overflow-hidden"
        >
          <div className={cn(bodyPad[size], "text-muted-foreground")}>{children}</div>
        </motion.div>
      )}
    </AnimatePresence>
  )
}

/* Shared shell: a primary bar on the left. When grow=true the bar grows from the top down while open (scaleY), otherwise it appears with opacity. glow adds a tinted shadow, and tintOpen gives a light primary surface while open. */
function AccentShell({
  props,
  barWidth,
  grow,
  glow,
  tintOpen,
}: {
  props: StyledCollapsibleProps
  barWidth: string
  grow?: boolean
  glow?: boolean
  tintOpen?: boolean
}) {
  const { className, size = "md", title = defaultTitle, children = defaultChildren } = props
  const { isOpen, toggle } = useControllableOpen(props)
  const reduce = useReducedMotion()
  return (
    <div
      data-slot="styled-collapsible"
      className={cn(
        "relative overflow-hidden rounded-xl border border-border bg-background transition-colors",
        tintOpen && isOpen &&
          "bg-[color-mix(in_oklab,var(--color-primary)_6%,transparent)]",
        className
      )}
    >
      <motion.span
        aria-hidden
        className={cn(
          "absolute inset-y-0 left-0 origin-top rounded-r bg-primary",
          barWidth,
          glow && "shadow-[0_0_12px_color-mix(in_oklab,var(--color-primary)_60%,transparent)]"
        )}
        initial={false}
        animate={
          reduce
            ? undefined
            : grow
              ? { scaleY: isOpen ? 1 : 0.35, opacity: isOpen ? 1 : 0.5 }
              : { opacity: isOpen ? 1 : 0.4 }
        }
        transition={reduce ? { duration: 0 } : { type: "spring" as const, stiffness: 260, damping: 26 }}
      />
      <button
        type="button"
        aria-expanded={isOpen}
        onClick={toggle}
        className={cn(
          headerBase,
          headerPad[size],
          "pl-5 hover:bg-[color-mix(in_oklab,var(--color-foreground)_5%,transparent)]"
        )}
      >
        {title}
        <Chevron isOpen={isOpen} size={size} />
      </button>
      <div className="pl-2">
        <Panel isOpen={isOpen} size={size}>
          {children}
        </Panel>
      </div>
    </div>
  )
}

/* Bar: a thin primary line that becomes fully opaque when on. */
export function BarCollapsible(props: StyledCollapsibleProps) {
  return <AccentShell props={props} barWidth="w-1" />
}

/* Grow: bar acikken tepeden asagi buyuyerek uzar. */
export function GrowCollapsible(props: StyledCollapsibleProps) {
  return <AccentShell props={props} barWidth="w-1" grow />
}

/* Glow: buyuyen bar + primary tonlu yumusak parilti. */
export function GlowCollapsible(props: StyledCollapsibleProps) {
  return <AccentShell props={props} barWidth="w-1" grow glow />
}

/* Left: a thick left bar, fully opaque when on (static height). */
export function LeftCollapsible(props: StyledCollapsibleProps) {
  return <AccentShell props={props} barWidth="w-1.5" />
}

/* Full: buyuyen bar + acikken hafif primary yuzey tinti. */
export function FullCollapsible(props: StyledCollapsibleProps) {
  return <AccentShell props={props} barWidth="w-1.5" grow tintOpen />
}

Manual installs skip the @ai2/tokens theme, so add the token CSS from the theming guide or the tone colors will be missing.

Variations

5 takes on the same idea. Each is its own export, and every one accepts a size prop (sm, md, lg, xl) aligned to the base Button scale.

Bar

A thin primary bar that turns fully opaque when open.

Grow

The bar scales from the top down as the panel opens.

Glow

A growing bar with a soft primary-tinted glow.

Left

A thicker static left bar that brightens when open.

Full

A growing bar plus a faint primary surface tint when open.

ai2 Accent collapsibles: 5 styled variations on the token system

The ai2 Accent collapsibles are a set of 5 decorative button variations from the styled layer of the @ai2 design system, built around disclosures led by an animated primary left bar. They are free and MIT licensed, and every color comes from a semantic token, so they theme with the rest of ai2 in light and dark.

Motion runs on framer-motion: framer-motion springs the left bar and animates the panel height. The styled layer is opt-in, so the dependency only lands if you use it; the base components stay lean. Under reduced motion, the bar and panel change state instantly with no transforms.

What is in the ai2 Accent collapsibles?

5 exports in one file: Bar, Grow, Glow, Left and Full. Each renders a native button and takes a size prop (sm, md, lg, xl) aligned to the base Button. They are separate from the base Button on purpose: the base keeps its clean variant, tone and size axes, while the styled layer carries the effects.

You own the file. Copy the one category file and you have all 5 variations, with no runtime dependency on ai2 itself.

Why use it

On-system by construction: Every color resolves to an ai2 semantic token, so the buttons follow your theme in light and dark with no extra work.
Effect without the sprawl: The decorations live in a dedicated styled file, so the base Button keeps its clean, predictable API.
Accessible and honest: Each renders a real button element, keeps a visible focus ring, and respects prefers-reduced-motion.

Features

Token-driven color: No hardcoded hex or oklch; the look recolors with your theme tokens.
framer-motion: framer-motion springs the left bar and animates the panel height.
Reduced-motion aware: Under prefers-reduced-motion, the bar and panel change state instantly with no transforms.
Size aligned to the base: Every variation takes sm, md, lg and xl matching the base Button height scale, so styled and base buttons line up in a row.

Production tips

Use it for emphasis, not everywhere: Styled buttons draw the eye. Reserve them for the one action you want people to take on a screen, and use the base Button for the rest.
Keep labels as verbs: The decoration adds weight, so a clear action label keeps the button scannable.
Pick one variation per surface: The variations share a family; using two different ones in the same view competes for attention.

Works with the rest of ai2

The Accent collapsibles sit alongside the base Button and the rest of the @ai2 registry. They share the same token file, so a styled action next to a base button or a badge stays visually consistent in both modes.