Accordion

npm install react-aria-components

"use client";

import type { ReactNode } from "react";
import { Button, Disclosure, DisclosureGroup, DisclosurePanel, Heading, type DisclosureGroupProps, type DisclosureProps } from "react-aria-components";

const join = (...classes: (string | undefined)[]) => classes.filter(Boolean).join(" ");

const styles = {
  root: "flex w-full flex-col gap-(--tui-accordion-gap) font-(family-name:--tui-font) text-(length:--tui-accordion-font-size) text-(--tui-accordion-fg)",
  // Every question is a soft box of its own. Nothing is ruled off: the gaps do the separating.
  item: "group rounded-(--tui-accordion-radius) bg-(--tui-accordion-bg) transition-colors duration-(--tui-accordion-duration) ease-out data-disabled:opacity-(--tui-accordion-disabled-opacity) data-expanded:bg-(--tui-accordion-bg-open)! has-[[data-hovered]]:bg-(--tui-accordion-bg-hover)",
  trigger:
    "flex min-h-(--tui-accordion-height) w-full cursor-default items-center justify-between gap-4 rounded-(--tui-accordion-radius) border-none bg-transparent px-(--tui-accordion-padding-x) text-left font-(family-name:--tui-font) text-(length:--tui-accordion-font-size) leading-snug font-(--tui-accordion-font-weight) text-(--tui-accordion-fg) outline-none data-focus-visible:[outline:var(--tui-accordion-ring-width)_solid_var(--tui-accordion-ring)] data-focus-visible:[outline-offset:var(--tui-accordion-ring-offset)]",
  // A plus in a disc. Opening turns it into a cross.
  icon: "flex size-(--tui-accordion-icon-size) shrink-0 items-center justify-center rounded-full bg-(--tui-accordion-icon-bg) text-(--tui-accordion-icon) transition-[rotate] duration-(--tui-accordion-duration) ease-out group-data-expanded:rotate-45",
  panel: "h-(--disclosure-panel-height) overflow-clip transition-[height] duration-(--tui-accordion-duration) ease-out motion-reduce:transition-none",
  body: "px-(--tui-accordion-padding-x) pb-(--tui-accordion-panel-padding) leading-relaxed text-(--tui-accordion-muted)",
};

export function Accordion({ className, ...props }: Omit<DisclosureGroupProps, "className"> & { className?: string }) {
  return <DisclosureGroup {...props} className={join(styles.root, className)} />;
}

export interface AccordionItemProps extends Omit<DisclosureProps, "className" | "children"> {
  title: ReactNode;
  children: ReactNode;
  className?: string;
}

export function AccordionItem({ title, children, className, ...props }: AccordionItemProps) {
  return (
    <Disclosure data-slot="accordion-item" {...props} className={join(styles.item, className)}>
      <Heading className="m-0">
        <Button slot="trigger" className={styles.trigger}>
          {title}
          <span aria-hidden className={styles.icon}>
            <svg viewBox="0 0 16 16" fill="none" stroke="currentColor" strokeWidth="1.75" strokeLinecap="round" className="size-[52%]">
              <path d="M8 3.500v9M3.500 8h9" />
            </svg>
          </span>
        </Button>
      </Heading>
      <DisclosurePanel className={styles.panel}>
        <div className={styles.body}>{children}</div>
      </DisclosurePanel>
    </Disclosure>
  );
}

:root {
  color-scheme: light;
  --tui-bg: #ffffff;
  --tui-fg: #0a0a0a;
  --tui-muted: #f5f5f5;
  --tui-muted-fg: #737373;
  --tui-border: #e5e5e5;
  --tui-primary: #171717;
  --tui-primary-fg: #fafafa;
  --tui-ring: #a3a3a3;
  --tui-success: #16a34a;
  --tui-warning: #d97706;
  --tui-danger: #dc2626;
  --tui-radius: 8px;
  --tui-border-width: 1px;
  --tui-space: 4px;
  --tui-shadow: none;
  --tui-font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --tui-text: 14px;
  --tui-duration: 150ms;

  /* Accordion */
  --tui-accordion-height: calc(var(--tui-space) * 14);
  --tui-accordion-padding-x: calc(var(--tui-space) * 5);
  --tui-accordion-panel-padding: calc(var(--tui-space) * 5);
  --tui-accordion-gap: calc(var(--tui-space) * 2);
  --tui-accordion-icon-size: calc(var(--tui-space) * 7);
  --tui-accordion-radius: calc(var(--tui-radius) * 2.25);
  --tui-accordion-font-size: var(--tui-text);
  --tui-accordion-font-weight: 500;
  --tui-accordion-duration: 200ms;
  --tui-accordion-bg: color-mix(in srgb, var(--tui-bg) 96%, var(--tui-fg));
  --tui-accordion-fg: var(--tui-fg);
  --tui-accordion-muted: var(--tui-muted-fg);
  --tui-accordion-icon: var(--tui-fg);
  --tui-accordion-icon-bg: color-mix(in srgb, var(--tui-bg) 93%, var(--tui-fg));
  --tui-accordion-bg-hover: color-mix(in srgb, var(--tui-bg) 93%, var(--tui-fg));
  --tui-accordion-bg-open: color-mix(in srgb, var(--tui-bg) 95%, var(--tui-fg));
  --tui-accordion-ring: var(--tui-ring);
  --tui-accordion-ring-width: 2px;
  --tui-accordion-ring-offset: 2px;
  --tui-accordion-disabled-opacity: 0.5;
}

.dark,
[data-theme="dark"] {
  color-scheme: dark;
  --tui-bg: #0a0a0a;
  --tui-fg: #fafafa;
  --tui-muted: #1c1c1c;
  --tui-muted-fg: #a3a3a3;
  --tui-border: #2a2a2a;
  --tui-primary: #fafafa;
  --tui-primary-fg: #171717;
  --tui-ring: #737373;
  --tui-success: #22c55e;
  --tui-warning: #f59e0b;
  --tui-danger: #ef4444;
}