[G1-Sync] Manual knowledge update
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Antigravity Agent
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id: wiki-2026-0508-accordion
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title: Accordion
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category: 10_Wiki/Topics
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status: needs_review
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status: verified
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canonical_id: self
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aliases: []
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aliases: [Collapsible, Disclosure]
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duplicate_of: none
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source_trust_level: A
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confidence_score: 0.92
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tags: [uncategorized]
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confidence_score: 0.9
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verification_status: applied
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tags: [ui, component, a11y]
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raw_sources: []
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last_reinforced: 2026-05-08
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last_reinforced: 2026-05-10
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github_commit: pending
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inferred_by: Claude Opus 4.7 (auto-normalize 2026-05-08)
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tech_stack:
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language: unspecified
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framework: unspecified
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language: TypeScript
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framework: React
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---
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<ComponentPreview
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name="accordion-demo"
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styleName="radix-nova"
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align="start"
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previewClassName="*:data-[slot=accordion]:max-w-sm h-[300px]"
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/>
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# Accordion
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## Installation
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## 매 한 줄
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> **"매 expand-on-demand UI primitive"**. 매 1980s desktop GUI 의 origin → 매 2026 web 의 ARIA disclosure pattern, FAQ/sidebar/settings 의 default density-saving widget.
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<CodeTabs>
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## 매 핵심
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<TabsList>
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<TabsTrigger value="cli">Command</TabsTrigger>
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<TabsTrigger value="manual">Manual</TabsTrigger>
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</TabsList>
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### 매 mechanism
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- 매 header (button) + 매 panel (region) 의 pair.
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- 매 `aria-expanded` + `aria-controls` + `region role` 의 a11y triplet.
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- 매 single-expand (radio-like) vs multi-expand (checkbox-like).
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<TabsContent value="cli">
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### 매 modern stack
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- 매 Radix UI `Accordion` (headless, WAI-ARIA-compliant).
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- 매 React Aria, Headless UI, shadcn/ui Accordion.
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- 매 native `<details>/<summary>` (free a11y, limited animation).
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```bash
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npx shadcn@latest add accordion
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### 매 응용
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1. FAQ pages (Stripe, GitHub docs).
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2. Settings panels (VSCode sidebar).
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3. Mobile navigation drawers.
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## 💻 패턴
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### Radix UI Accordion (single-expand)
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```tsx
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import * as Accordion from '@radix-ui/react-accordion';
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export function FAQ() {
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return (
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<Accordion.Root type="single" collapsible defaultValue="item-1">
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<Accordion.Item value="item-1">
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<Accordion.Trigger className="flex w-full justify-between p-4">
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What is React?
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<ChevronDown className="transition-transform data-[state=open]:rotate-180" />
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</Accordion.Trigger>
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<Accordion.Content className="overflow-hidden data-[state=open]:animate-slideDown">
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A library for UIs.
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</Accordion.Content>
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</Accordion.Item>
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</Accordion.Root>
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);
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}
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```
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</TabsContent>
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### Native `<details>` (zero-JS)
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```html
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<details>
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<summary>Click to expand</summary>
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<p>Hidden content.</p>
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</details>
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<TabsContent value="manual">
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<Steps className="mb-0 pt-2">
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<Step>Install the following dependencies:</Step>
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```bash
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npm install radix-ui
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<style>
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details[open] summary ~ * { animation: slideDown 200ms ease-out; }
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@keyframes slideDown { from { opacity: 0; transform: translateY(-8px); } }
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</style>
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```
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<Step>Copy and paste the following code into your project.</Step>
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<ComponentSource
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name="accordion"
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title="components/ui/accordion.tsx"
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styleName="radix-nova"
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/>
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<Step>Update the import paths to match your project setup.</Step>
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</Steps>
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</TabsContent>
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</CodeTabs>
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## Usage
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```tsx showLineNumbers
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import {
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Accordion,
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AccordionContent,
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AccordionItem,
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AccordionTrigger,
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} from "@/components/ui/accordion"
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### Custom hook (multi-expand)
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```ts
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function useAccordion(initial: string[] = []) {
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const [open, setOpen] = useState(new Set(initial));
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const toggle = (id: string) =>
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setOpen(prev => {
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const next = new Set(prev);
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next.has(id) ? next.delete(id) : next.add(id);
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return next;
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});
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return { isOpen: (id: string) => open.has(id), toggle };
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}
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```
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```tsx showLineNumbers
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<Accordion type="single" collapsible defaultValue="item-1">
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<AccordionItem value="item-1">
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<AccordionTrigger>Is it accessible?</AccordionTrigger>
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<AccordionContent>
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Yes. It adheres to the WAI-ARIA design pattern.
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</AccordionContent>
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</AccordionItem>
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</Accordion>
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### 매 height animation (interpolate to auto)
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```css
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[data-state='closed'] { grid-template-rows: 0fr; }
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[data-state='open'] { grid-template-rows: 1fr; }
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.panel { display: grid; transition: grid-template-rows 200ms; }
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.panel > div { overflow: hidden; }
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```
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## Composition
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Use the following composition to build an `Accordion`:
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```text
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Accordion
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├── AccordionItem
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│ ├── AccordionTrigger
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│ └── AccordionContent
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└── AccordionItem
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├── AccordionTrigger
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└── AccordionContent
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### 매 keyboard support (Radix-equivalent)
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```ts
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function onKeyDown(e: KeyboardEvent) {
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if (e.key === 'ArrowDown') focusNextHeader();
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if (e.key === 'ArrowUp') focusPrevHeader();
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if (e.key === 'Home') focusFirstHeader();
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if (e.key === 'End') focusLastHeader();
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}
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```
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## Examples
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## 매 결정 기준
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| 상황 | Approach |
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|---|---|
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| 0-JS, simple FAQ | `<details>` |
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| Animated, controlled | Radix UI |
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| Form section | Custom (preserve mounted state) |
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### Basic
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**기본값**: Radix UI Accordion + Tailwind animations.
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A basic accordion that shows one item at a time. The first item is open by default.
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## 🔗 Graph
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- 부모: [[Disclosure-Pattern]] · [[Headless-UI]]
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- 변형: [[Collapsible]] · [[Tabs]]
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- 응용: [[FAQ]] · [[Settings-Panel]]
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- Adjacent: [[Radix-UI]] · [[ARIA]]
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<ComponentPreview
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name="accordion-basic"
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styleName="radix-nova"
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align="start"
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previewClassName="*:data-[slot=accordion]:max-w-sm h-[300px]"
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/>
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## 🤖 LLM 활용
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**언제**: density-saving long-form lists, optional sections.
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**언제 X**: critical information (hidden by default = missed); sequential workflows (use Stepper).
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### Multiple
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## ❌ 안티패턴
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- **Multi-open by default 의 visual chaos**: Use single-expand for nav.
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- **No `aria-expanded`**: screen readers 매 broken.
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- **Animating `height: auto`**: Use grid-rows trick or `max-height`.
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Use `type="multiple"` to allow multiple items to be open at the same time.
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## 🧪 검증 / 중복
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- Verified (Radix UI docs, WAI-ARIA Accordion Pattern).
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- 신뢰도 A.
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<ComponentPreview
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name="accordion-multiple"
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styleName="radix-nova"
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align="start"
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previewClassName="*:data-[slot=accordion]:max-w-sm h-[36rem] md:h-[30rem]"
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/>
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### Disabled
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Use the `disabled` prop on `AccordionItem` to disable individual items.
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<ComponentPreview
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name="accordion-disabled"
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styleName="radix-nova"
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align="start"
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previewClassName="*:data-[slot=accordion]:max-w-sm h-[300px]"
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/>
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### Borders
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Add `border` to the `Accordion` and `border-b last:border-b-0` to the `AccordionItem` to add borders to the items.
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<ComponentPreview
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name="accordion-borders"
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styleName="radix-nova"
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align="start"
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previewClassName="*:data-[slot=accordion]:max-w-sm h-96 md:h-80"
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/>
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### Card
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Wrap the `Accordion` in a `Card` component.
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<ComponentPreview
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name="accordion-card"
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styleName="radix-nova"
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align="start"
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previewClassName="*:data-[slot=accordion]:max-w-sm h-[32rem] md:h-[28rem]"
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/>
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## RTL
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To enable RTL support in shadcn/ui, see the [RTL configuration guide](/docs/rtl).
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<ComponentPreview
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styleName="radix-nova"
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name="accordion-rtl"
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align="start"
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direction="rtl"
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/>
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## API Reference
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See the [Radix UI](https://www.radix-ui.com/primitives/docs/components/accordion#api-reference) documentation for more information.
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## 🔗 지식 연결 (Graph)
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### Related Concepts (Auto-Linked)
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* [[Design Pattern]]
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* [[Radix UI]]
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* [[Reference]]
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* [[Support]]
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* [[shadcn-ui]]
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## 📌 한 줄 통찰 (The Karpathy Summary)
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> *(TODO: 한 문장으로 핵심 통찰을 작성. "X는 Y 조건에서 Z 효과를 낸다" 구조 권장.)*
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## 📖 구조화된 지식 (Synthesized Content)
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**추출된 패턴:**
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> *(TODO)*
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**세부 내용:**
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- *(TODO)*
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## 🤖 LLM 활용 힌트 (How to Use This Knowledge)
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**언제 이 지식을 쓰는가:**
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- *(TODO)*
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**언제 쓰면 안 되는가:**
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- *(TODO)*
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## 🧪 검증 상태 (Validation)
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- **정보 상태:** needs_review
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- **출처 신뢰도:** A
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- **검토 이유:** *(P-Reinforce Phase 1 자동 정규화. 본문 검증 필요.)*
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## 🧬 중복 검사 (Duplicate Check)
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- **기존 유사 문서:** *(TODO: 인덱서 클러스터 리포트 참조)*
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- **처리 방식:** UPDATE (자동 정규화)
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- **처리 이유:** Phase 1 정규화 — 옛 템플릿/누락 필드 보강.
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## ⚠️ 모순 및 업데이트 (Contradictions & Updates)
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- **과거 데이터와의 충돌:** 없음
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- **정책 변화:** 없음
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## 🕓 변경 이력 (Changelog)
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| 날짜 | 변경 내용 | 처리 방식 | 신뢰도 |
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|------|-----------|-----------|--------|
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| 2026-05-08 | P-Reinforce Phase 1 정규화 (frontmatter + 헤더 표준화) | UPDATE | A |
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## 💻 코드 패턴 (Code Patterns)
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**패턴 1:** *(TODO: 이 프로젝트 컨벤션 반영한 구조 스켈레톤)*
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```text
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# TODO
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```
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## 🤔 의사결정 기준 (Decision Criteria)
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**선택 A를 써야 할 때:**
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- *(TODO)*
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**선택 B를 써야 할 때:**
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- *(TODO)*
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**기본값:**
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> *(TODO)*
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## ❌ 안티패턴 (Anti-Patterns)
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- **[안티패턴]:** *(TODO: 무엇을 하면 안 되는가 + 이유 + 대신 무엇을)*
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## 🕓 Changelog
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| 날짜 | 변경 |
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|---|---|
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| 2026-05-08 | Phase 1 |
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| 2026-05-10 | Manual cleanup — Accordion FULL content with Radix patterns |
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