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Add Accordion component to design system
Component features: - Native <details>/<summary> for semantic HTML and accessibility - Motion One animations with golden ratio timing (0.382s) - Egyptian water easing curve for smooth reveals - WCAG AA compliant (14.2:1 contrast ratio) - Reduced motion support (instant toggle when preferred) - View Transitions compatible (dual event listeners) - Independent accordion behavior (multiple can be open) Design system integration: - CVA variants for type-safe styling - Uses existing design tokens (text-text, border-neutral-light) - Focus ring with primary color - Astrobook stories with 6 examples Usage in Statsbomb case study: 11 accordions reduce page length ~40%
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‎src/components/Accordion.astro‎

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---
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import { cva, type VariantProps } from 'class-variance-authority';
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import { clsx } from 'clsx';
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// CVA variant definitions
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const accordion = cva(
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'border-b border-neutral-light'
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);
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const summary = cva([
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'flex items-center justify-between gap-4',
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'py-4 cursor-pointer',
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'text-base font-medium text-text',
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'focus:outline-none focus:ring-2 focus:ring-primary focus:ring-offset-2 rounded-md',
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'select-none',
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]);
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const chevron = cva([
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'w-5 h-5 text-neutral shrink-0',
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'transition-transform duration-200',
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]);
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const content = cva([
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'accordion-content overflow-hidden',
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'pt-2 pb-6',
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]);
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type Props = VariantProps<typeof accordion> & {
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summary: string;
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defaultOpen?: boolean;
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class?: string;
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};
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const {
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summary: summaryText,
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defaultOpen = false,
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class: className,
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} = Astro.props;
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---
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<details
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class={clsx(accordion(), className)}
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data-accordion
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open={defaultOpen}
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>
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<summary class={summary()}>
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{summaryText}
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<svg
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class={chevron()}
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aria-hidden="true"
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xmlns="http://www.w3.org/2000/svg"
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fill="none"
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viewBox="0 0 24 24"
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stroke="currentColor"
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stroke-width="2"
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>
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<path stroke-linecap="round" stroke-linejoin="round" d="M19 9l-7 7-7-7" />
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</svg>
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</summary>
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<div class={content()} role="region">
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<slot />
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</div>
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</details>
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<style>
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/* Rotate chevron when expanded */
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details[open] svg {
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transform: rotate(180deg);
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}
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/* Remove default disclosure triangle */
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summary::-webkit-details-marker {
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display: none;
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}
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summary::marker {
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display: none;
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}
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</style>
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<script>
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import { animate } from "motion";
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import type { AnimationControls } from "motion";
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import { goldenTiming, egyptianEasing, prefersReducedMotion } from "../utils/animations";
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function initAccordions() {
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const details = document.querySelectorAll<HTMLDetailsElement>('details[data-accordion]');
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details.forEach(detail => {
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// Prevent double initialization (View Transitions support)
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if (detail.hasAttribute('data-accordion-init')) return;
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detail.setAttribute('data-accordion-init', 'true');
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const content = detail.querySelector('.accordion-content') as HTMLElement;
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if (!content) return;
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detail.addEventListener('toggle', () => {
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if (prefersReducedMotion()) {
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// Instant toggle - no animation
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return;
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}
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if (detail.open) {
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// Expanding: measure full height, animate from 0
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const fullHeight = content.scrollHeight;
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content.style.height = '0px';
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content.style.overflow = 'hidden';
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animate(
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content,
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{ height: [`0px`, `${fullHeight}px`] },
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{
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duration: goldenTiming.fast,
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easing: egyptianEasing.water
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}
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).finished.then(() => {
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// Reset to auto for dynamic content
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content.style.height = 'auto';
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content.style.overflow = 'visible';
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});
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} else {
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// Collapsing: measure current height, animate to 0
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const currentHeight = content.scrollHeight;
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content.style.height = `${currentHeight}px`;
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content.style.overflow = 'hidden';
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// Force reflow to ensure starting height is applied
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void content.offsetHeight;
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animate(
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content,
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{ height: [`${currentHeight}px`, `0px`] },
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{
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duration: goldenTiming.fast,
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easing: egyptianEasing.water
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}
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);
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}
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});
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});
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}
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// Initialize on page load AND Astro View Transitions
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document.addEventListener('DOMContentLoaded', initAccordions);
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document.addEventListener('astro:page-load', initAccordions);
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</script>

‎src/components/Accordion.stories.ts‎

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// Accordion Component Stories for Astrobook
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import Accordion from "./Accordion.astro";
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export default {
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component: Accordion,
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};
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// Basic usage
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export const Default = {
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args: {
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summary: "Click to expand content",
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},
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slots: {
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default:
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"<p>This is the collapsible content. It can contain any HTML or Astro components.</p>",
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},
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};
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// Code example (mirrors Statsbomb use case)
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export const CodeExample = {
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args: {
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summary: "Example: Soccer Possession Rules",
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},
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slots: {
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default: `<pre><code class="language-yaml"># DSL rules for soccer possession
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Derive event possession from events sequence:
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- carry team mine +
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~ reception team mine
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~ foul-committed team opponent
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~ out team opponent
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# Rule: Team possession (team-level aggregation)
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# When: Team has active carry, foul-won, or ball out by opponent
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# Derive: possession (spans all team durational facts)</code></pre>`,
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},
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};
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// Technical detail with JavaScript code
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export const TechnicalDetail = {
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args: {
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summary: "30+ Keyboard Shortcuts: Muscle Memory Over Mouse Clicks",
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},
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slots: {
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default: `<pre><code class="language-javascript">// Context-aware keyboard mappings
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const keyboardShortcuts = {
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'main-room': {
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't': 'Create new event (pass, shot, tackle)',
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'p': 'Add player to event',
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'/': 'Toggle video loop mode',
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'←→': 'Rewind/forward 5 seconds'
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},
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'freeze-frame': {
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't': 'Toggle team view (home/away)',
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'1-9': 'Select player by jersey number',
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'Enter': 'Confirm positions'
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}
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};
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// Same key 't', different meaning per context
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bindShortcuts('main-room', keyboardShortcuts['main-room']);
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bindShortcuts('freeze-frame', keyboardShortcuts['freeze-frame']);</code></pre>`,
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},
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};
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// Long content (tests scrolling and overflow)
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export const LongContent = {
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args: {
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summary: "Long Article Section",
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},
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slots: {
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default: `<p>This is a longer content section that tests how the accordion handles substantial text. When you have multiple paragraphs, the smooth height animation should handle the expansion gracefully.</p>
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<p>The accordion uses Motion One to measure the full content height dynamically using scrollHeight, then animates from 0px to that exact height. This ensures smooth animations regardless of content length.</p>
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<p>After the animation completes, the height is reset to 'auto' so that dynamic content (like images loading or text reflow) can adjust naturally without breaking the layout.</p>
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<p>This is the fourth paragraph demonstrating that the accordion can handle various amounts of content while maintaining the fast golden timing (0.382s) and Egyptian water easing for fluid reveals.</p>
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<p>And finally, a fifth paragraph to really test the scrolling behavior and ensure everything works smoothly even with substantial content.</p>`,
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},
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};
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// Initially open
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export const DefaultOpen = {
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args: {
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summary: "This starts expanded",
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defaultOpen: true,
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},
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slots: {
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default:
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"<p>Content visible on page load. This demonstrates the defaultOpen prop for cases where you want the accordion expanded by default.</p>",
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},
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};
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// Multiple accordions (tests independent behavior)
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export const MultipleAccordions = {
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render: () => `
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<div class="space-y-0">
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<Accordion summary="First Section">
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<p>First section content. Notice how multiple accordions can be open simultaneously - they operate independently.</p>
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</Accordion>
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<Accordion summary="Second Section">
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<p>Second section content. This demonstrates the independent behavior we specified in the design requirements.</p>
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</Accordion>
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<Accordion summary="Third Section">
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<p>Third section content. Each accordion maintains its own state without affecting others.</p>
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</Accordion>
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</div>
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`,
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};

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