docs(10_Wiki): 위키 구조 정리 — 언어 튜토리얼 카테고리 폴더 제거 + 신규 자산 동기화
Topic_CSS/Topic_HTML/Topic_JavaScript/Topic_Prompt/Topic_Comfyui 등 기존 카테고리 폴더를 정리하고, Topic_Graphic/Dev 등 신규 산출물과 Topics 내부 세션/메모리 기록을 동기화.
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Antigravity Agent
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id: css-flexbox-responsive
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title: "CSS Flexbox Responsive"
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category: "Frontend"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["responsive flexbox", "flexbox media queries", "flex-direction breakpoint", "responsive flex layout", "flex responsive columns"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.88
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created_at: 2026-06-23
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updated_at: 2026-06-23
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review_reason: ""
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merge_history: []
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tags: ["css", "web", "frontend", "w3schools", "flexbox", "responsive"]
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raw_sources: ["https://www.w3schools.com/css/css3_flexbox_responsive.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS Flexbox Responsive]]
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## 🎯 한 줄 통찰 (One-line insight)
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Responsive Flexbox layouts adapt across screen sizes by using media queries to either change `flex-direction` from `row` to `column`, or adjust the percentage of the `flex` property on wrapping items. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Two responsive techniques** — change `flex-direction`, or change the `flex` percentage at a breakpoint. [S1]
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- **Direction switch** — switch `flex-direction` from `row` to `column` at a breakpoint to convert a multi-column layout into a one-column layout on small screens. [S1]
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- **Flex percentage switch** — change the `flex` percentage of items (requires `flex-wrap: wrap`) to reflow columns at a breakpoint. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Breakpoint via `@media`** — both techniques wrap the layout change in a `@media (max-width: 600px)` query. [S1]
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- **`flex-wrap: wrap` enables percentage reflow** — required on the container when using the `flex` percentage method. [S1]
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## 📖 세부 내용 (Details)
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**Method 1: Changing Flex Direction**
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If you want to create a three-column layout for large screen sizes, and a one-column layout for small screen sizes (such as phones), you can change the `flex-direction` from `row` to `column` at a specific breakpoint. [S1]
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```css
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.flex-container {
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display: flex;
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flex-direction: row;
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}
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.flex-item {
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background-color: #f1f1f1;
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padding: 10px;
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font-size: 30px;
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text-align: center;
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width: 100%;
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}
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/* Make a one column-layout instead of three-column layout */
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@media (max-width: 600px) {
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.flex-container {
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flex-direction: column;
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}
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}
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```
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**Method 2: Modifying the Flex Property**
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An alternative technique involves changing the percentage of the `flex` property of the flex items to create different layouts for different screen sizes, requiring `flex-wrap: wrap;` on the container. [S1]
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```css
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.flex-container {
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display: flex;
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flex-wrap: wrap;
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}
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.flex-item {
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background-color: #f1f1f1;
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padding: 10px;
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text-align: center;
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font-size: 30px;
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flex: 33.3%;
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}
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/* Make a one column-layout instead of a three-column layout */
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@media (max-width: 600px) {
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.flex-item {
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flex: 100%;
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}
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}
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```
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The page also references two additional examples — a responsive image gallery and a responsive website — both implementing flexbox with media queries for layout adaptation. The full source code of those two examples was not found inline on the page (presented behind "Try it Yourself" links).
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## 🛠️ 적용 사례 (Applied in summary)
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The page applies both techniques to a `.flex-container`/`.flex-item` pair, reflowing a three-column layout into one column below a 600px breakpoint. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Responsive reflow via flex-direction (language: CSS):
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```css
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.flex-container {
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display: flex;
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flex-direction: row;
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}
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@media (max-width: 600px) {
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.flex-container {
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flex-direction: column;
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}
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}
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```
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## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
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- **Change `flex-direction`** — simplest when each item is full-width (`width: 100%`) and you just need to stack them vertically on small screens. [S1]
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- **Change `flex` percentage** — use when items wrap (`flex-wrap: wrap`) and you want to control how many columns appear at each breakpoint (e.g., `flex: 33.3%` to `flex: 100%`). [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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No contradictions found in the source.
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual (실제 적용 사례 발견 시 applied/validated로 승격 가능)
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.88
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[CSS Tutorial]]
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- **관련 개념:** [[CSS Flexbox Justify Content]], [[CSS Flexbox Align Items]], [[CSS Flex Items]]
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- **참조 맥락:** Referenced whenever building flexbox layouts that must adapt across desktop and mobile screen sizes.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS Flexbox Responsive — https://www.w3schools.com/css/css3_flexbox_responsive.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Flexbox Responsive" page (Astra wiki-curation, P-Reinforce v3.1 format).
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