refactor(topics): 멀티 에이전트용 지식 재편 — _Common(공통 기본기) + Domain_* 구조

에이전트 8종(대화형/프로그래머 C·S/디자이너/설계자/기획자/QA/PD/PM)에게
[공통 기본 능력 + 롤별 Specialty] 2층으로 지식을 주입하기 위한 재분류.
문서 내용·포맷은 무수정, 폴더 이동만 (6,372개 문서 수 보존 확인).

- Topic_Programming → Domain_Programming (내부 구조 보존)
- Topic_Graphic → Domain_Design
- Topic_Business → Domain_Product
- Topic_General → Domain_General
- _Common 신설: Math(구 Topic_Math_Specialty), Reasoning(구 General/From_Thinking & Reasoning),
  Reasoning_Creativity(구 General/From_창의성), Communication(Poetic_Blog_Writing + From_writing)
- 타 도메인의 From_* 폴더는 유지 (출처 표기일 뿐, 이미 도메인에 맞게 분류된 문서)
- 빈 폴더 정리 (memory/procedures)
- 에이전트→폴더 매핑은 workspace의 .astra/agent-knowledge-map.json (9개 에이전트)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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---
id: css-flexbox-intro
title: "CSS Flexbox Intro"
category: "Frontend"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["Flexbox", "Flexible Box Layout", "display flex", "flex container flex items", "CSS flex layout"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.88
created_at: 2026-06-23
updated_at: 2026-06-23
review_reason: ""
merge_history: []
tags: ["css", "web", "frontend", "w3schools", "flexbox", "layout"]
raw_sources: ["https://www.w3schools.com/css/css3_flexbox.asp"]
applied_in: []
github_commit: ""
---
# [[CSS Flexbox Intro]]
## 🎯 한 줄 통찰 (One-line insight)
CSS Flexbox (the Flexible Box Layout module) is a one-dimensional layout model that arranges items horizontally or vertically inside a flex container in a flexible, responsive way. [S1]
## 🧠 핵심 개념 (Core concepts)
- **What it is** — CSS Flexbox is short for the CSS Flexible Box Layout module; it is a layout model for arranging items (horizontally or vertically) within a container, in a flexible and responsive way. [S1]
- **Flex container** — the parent element, made a flex container with `display: flex` (or `inline-flex`). [S1]
- **Flex items** — the direct children of the container automatically become flex items. [S1]
- **One- vs two-dimensional** — CSS Flexbox is used for a one-dimensional layout, with rows OR columns; CSS Grid is used for a two-dimensional layout, with rows AND columns. [S1]
## 🧩 추출된 패턴 (Extracted patterns)
- **Container/item pattern** — declare `display: flex` on a parent; its direct children become arrangeable flex items automatically. [S1]
- **One-dimensional choice** — reach for flexbox when laying out along a single axis (a row OR a column); reach for Grid for two-axis layouts. [S1]
## 📖 세부 내용 (Details)
CSS Flexbox is short for the CSS Flexible Box Layout module. Flexbox is a layout model for arranging items (horizontally or vertically) within a container, in a flexible and responsive way. [S1]
Flexbox consists of: [S1]
- **A Flex Container** — the parent element with `display: flex` or `inline-flex`. [S1]
- **Flex Items** — the direct children that automatically become flex items. [S1]
**Flexbox vs Grid:** CSS Flexbox is used for a one-dimensional layout, with rows OR columns. CSS Grid is used for a two-dimensional layout, with rows AND columns. [S1]
**Example — a basic flex container with three items** [S1]
```html
<html>
<head>
<style>
.container {
display: flex;
background-color: DodgerBlue;
}
.container div {
background-color: #f1f1f1;
margin: 10px;
padding: 20px;
font-size: 30px;
}
</style>
</head>
<body>
<div class="container">
<div>Item 1</div>
<div>Item 2</div>
<div>Item 3</div>
</div>
</body>
</html>
```
**CSS Flexbox properties / browser-support table:** Not found in source (a property reference table was not present in the fetched content for this intro page; the source links forward to the Flex Container, Flex Items, and Flex Responsive pages). [S1]
## 🛠️ 적용 사례 (Applied in summary)
The page's applied example is a `.container` set to `display: flex` with a DodgerBlue background holding three styled `div` children ("Item 1", "Item 2", "Item 3"), which render in a horizontal row. No external project/commit applications found in the source.
## 💻 코드 패턴 (Code patterns)
Make an element a flex container (language: CSS):
```css
.container {
display: flex;
}
```
Container with three items (language: HTML):
```html
<div class="container">
<div>Item 1</div>
<div>Item 2</div>
<div>Item 3</div>
</div>
```
## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
- **Flexbox** — one-dimensional layout (rows OR columns). Choose it for arranging items along a single axis flexibly and responsively. [S1]
- **CSS Grid** — two-dimensional layout (rows AND columns). Choose it when you need to control both axes simultaneously. [S1]
## ⚖️ 모순 및 업데이트 (Contradictions & updates)
No contradictions found in the source.
## ✅ 검증 상태 및 신뢰도
- **상태:** draft
- **검증 단계:** conceptual (실제 적용 사례 발견 시 applied/validated로 승격 가능)
- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
- **신뢰 점수:** 0.88
- **중복 검사 결과:** 신규 생성 (New discovery)
## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[CSS Tutorial]]
- **관련 개념:** [[CSS Flex Container]], [[CSS Flex Items]], [[CSS Grid]], [[CSS Media Queries]]
- **참조 맥락:** The entry point for single-axis flexible layouts; precedes the Flex Container and Flex Items detail pages.
## 📚 출처 (Sources)
- [S1] W3Schools — CSS Flexbox Intro — https://www.w3schools.com/css/css3_flexbox.asp
## 📝 변경 이력 (Change history)
- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Flexbox Intro" page (Astra wiki-curation, P-Reinforce v3.1 format).