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최상위 10_Wiki/Topic_*였던 4개 카테고리 폴더를 10_Wiki/Topics/Topic_* 로 재배치. 콘텐츠 변경 없음(순수 폴더 이동) — Topics/ 하위 나머지 폴더는 이미 지난 커밋에서 전부 정리된 상태(잔존 항목은 에이전트 운영 상태 및 사용자가 보존을 요청한 업데이트0615/무제 3.canvas 뿐).
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+---
+id: wiki-2026-0508-styled-components
+title: Styled Components
+category: 10_Wiki/Topics
+status: verified
+canonical_id: self
+aliases: [styled-components, CSS-in-JS]
+duplicate_of: none
+source_trust_level: A
+confidence_score: 0.9
+verification_status: applied
+tags: [react, css-in-js, frontend, styling]
+raw_sources: []
+last_reinforced: 2026-05-10
+github_commit: pending
+tech_stack:
+  language: typescript
+  framework: react
+---
+
+# Styled Components
+
+## 매 한 줄
+> **"매 CSS 의 component 의 안에 — 매 tagged template literal 로 매 React component + style 의 atomic unit"**. Glen Maddern, Max Stoiber (2016). 매 CSS-in-JS 의 reference. 2026 매 styled-components v6+ 가 매 React Server Components 의 partial 지원 — 매 RSC native era 에서 매 Tailwind / vanilla-extract / CSS Modules 의 challenge.
+
+## 매 핵심
+
+### 매 mechanic
+- 매 tagged template literal: ``styled.button`color: red```.
+- 매 runtime 의 unique class name 의 generation, 매 stylesheet 의 inject.
+- 매 props-based dynamic styling: ``${props => props.primary ? '#0070f3' : '#fff'}``.
+
+### 매 features
+- **Theming**: ThemeProvider context.
+- **`as` prop**: 매 polymorphic element.
+- **Extending**: ``styled(Button)`...```.
+- **Animations**: keyframes helper.
+- **Global styles**: createGlobalStyle.
+
+### 매 응용
+1. React design system (Material-like component lib).
+2. Theme switcher (dark mode).
+3. Per-component style isolation.
+
+## 💻 패턴
+
+### Basic styled component (TypeScript)
+```tsx
+import styled from "styled-components";
+
+const Button = styled.button<{ $primary?: boolean }>`
+  padding: 8px 16px;
+  border-radius: 6px;
+  border: none;
+  cursor: pointer;
+  background: ${(p) => (p.$primary ? "#0070f3" : "#eee")};
+  color: ${(p) => (p.$primary ? "#fff" : "#222")};
+  &:hover { opacity: 0.9; }
+`;
+
+export default function App() {
+  return <Button $primary>Buy</Button>;
+}
+```
+
+### Theme + ThemeProvider
+```tsx
+import { ThemeProvider, DefaultTheme } from "styled-components";
+
+const dark: DefaultTheme = { bg: "#111", fg: "#eee", accent: "#0af" };
+const light: DefaultTheme = { bg: "#fff", fg: "#111", accent: "#06c" };
+
+const Card = styled.div`
+  background: ${(p) => p.theme.bg};
+  color: ${(p) => p.theme.fg};
+  padding: 16px;
+`;
+
+export default function App() {
+  const [mode, setMode] = useState<"light" | "dark">("dark");
+  return (
+    <ThemeProvider theme={mode === "dark" ? dark : light}>
+      <Card>Hello</Card>
+    </ThemeProvider>
+  );
+}
+```
+
+### Extending another styled component
+```tsx
+const Base = styled.button`padding: 8px; border-radius: 4px;`;
+const Danger = styled(Base)`background: #e00; color: white;`;
+```
+
+### `as` polymorphic prop
+```tsx
+const Box = styled.div`padding: 16px;`;
+<Box as="section" /> // renders <section>
+<Box as={Link} to="/x" /> // renders react-router Link
+```
+
+### Keyframes animation
+```tsx
+import styled, { keyframes } from "styled-components";
+const pulse = keyframes`
+  0% { transform: scale(1); }
+  50% { transform: scale(1.1); }
+  100% { transform: scale(1); }
+`;
+const Pulser = styled.div`animation: ${pulse} 1s infinite;`;
+```
+
+### Global styles
+```tsx
+import { createGlobalStyle } from "styled-components";
+const Global = createGlobalStyle`
+  body { margin: 0; font-family: Inter, sans-serif; background: ${(p) => p.theme.bg}; }
+`;
+```
+
+### css helper for shared mixin
+```tsx
+import { css } from "styled-components";
+const truncate = css`
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+`;
+const Title = styled.h2`${truncate} font-size: 24px;`;
+```
+
+### Next.js 14+ App Router (RSC) — 매 'use client'
+```tsx
+"use client";
+import styled from "styled-components";
+export const Button = styled.button`color: red;`;
+```
+
+```tsx
+// app/layout.tsx — registry pattern for SSR
+import StyledRegistry from "./StyledRegistry";
+export default function Root({ children }) {
+  return <html><body><StyledRegistry>{children}</StyledRegistry></body></html>;
+}
+```
+
+## 매 결정 기준
+| 상황 | Approach |
+|---|---|
+| React SPA, 매 dynamic theming heavy | styled-components / emotion |
+| React Server Components 의 native | vanilla-extract / CSS Modules / Tailwind |
+| Utility-first, design system | Tailwind CSS v4 |
+| Build-time zero-runtime | vanilla-extract / Linaria |
+| Component lib for distribution | CSS Modules + tokens |
+
+**기본값** (2026): 매 새 React project — Tailwind 의 default. styled-components 의 dynamic + theme heavy app 에 still-valid.
+
+## 🔗 Graph
+- 부모: [[CSS_Architecture_and_Styling|CSS-in-JS]] · [[React]]
+- 변형: [[vanilla-extract]]
+- 응용: [[Design System]] · [[Theme Switching]]
+- Adjacent: [[CSS_Architecture_and_Styling|Tailwind CSS]] · [[CSS Modules]] · [[React Server Components — 경계 의식]]
+
+## 🤖 LLM 활용
+**언제**: dynamic prop-based styles 의 heavy, theme switching 의 first-class, existing CSS-in-JS app.
+**언제 X**: 매 RSC-first new app — runtime cost + 'use client' boundary 의 friction. 매 Tailwind / vanilla-extract 의 prefer.
+
+## ❌ 안티패턴
+- **Inline style prop interpolation 의 every render**: 매 className thrash 의 perf hit. 매 attrs / static class 의 사용.
+- **No `$` prefix on props**: 매 DOM warning (unknown attribute). 매 transient prop 의 사용 — `$primary`.
+- **createGlobalStyle 의 multiple instances**: 매 conflict.
+- **SSR without registry**: 매 FOUC. Next.js registry 의 setup.
+
+## 🧪 검증 / 중복
+- Verified (styled-components.com docs v6, 2025; Next.js 14 App Router CSS-in-JS guide).
+- 신뢰도 A.
+
+## 🕓 Changelog
+| 날짜 | 변경 |
+|---|---|
+| 2026-05-08 | Phase 1 |
+| 2026-05-10 | Manual cleanup — styled-components v6 + RSC era guidance |