docs(10_Wiki): Dev 폴더 누락분 반영 — Topic_Programming으로 통합

이전 재구성 작업에서 Dev/ 폴더가 누락되었던 것을 반영.

- Dev/Topic_Programming(중첩 폴더, 78개)은 Dev 자체 최상위 폴더들
  (Architecture/Conventions/Engineering_Intelligence 등)과 완전 중복이라 제거.
- Dev 최상위 엔지니어링 지식 폴더(Architecture/Conventions/Engineering_Intelligence/
  Failure_Library/Generalized_Principles/Language/Pattern_Catalog/Platform_Guides/
  Subsystems, 77개)는 이미 Topic_Programming/Topic_Programming에 더 최신 버전이
  존재해 중복 제거(고유 콘텐츠 1개는 예외 처리하여 이동 보존).
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  JavaScript/PHP/Python/SQL/W3CSS, 1201개)는 전부 Topic_Programming 하위로 이동.
- 에이전트 운영 상태(.astra/docs)는 그대로 유지, 콘텐츠 폴더만 정리.
- Topic_Programming 최종 문서 수: 2784 → 3985.

10_Wiki/Topic_Programming/Topic_W3CSS/W3CSS_Web_CSS.md

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+---
+id: w3css-web-css
+title: "W3CSS Web CSS Stylesheet"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["using a stylesheet", "responsive images with w3-third", "W3.CSS 스타일시트 연결"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.84
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["w3css", "css-framework", "w3schools", "stylesheet", "responsive"]
+raw_sources: ["https://www.w3schools.com/w3css/w3css_web_css.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[W3CSS Web CSS Stylesheet]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+This chapter shows that "becoming responsive" requires NOTHING beyond the skeleton's single empty `<link>` tag being filled in — the exact same three-image `w3-row`/`w3-third` markup that would be static/unresponsive as plain HTML instantly becomes responsive the moment `w3.css` is linked, meaning the ONLY thing separating a static layout from a responsive one in this crash course is which stylesheet URL fills that one blank. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Activating the skeleton** — filling the previous chapter's empty `<link rel="stylesheet" href="">` with `https://www.w3schools.com/w3css/5/w3.css`. [S1]
+- **Class-driven styling** — once linked, elements only become styled once given a `w3-*` class (e.g. `w3-container w3-black`); linking alone changes nothing visually until classes are added. [S1]
+- **Responsive image row** — `w3-row` + three `w3-third` columns, each containing a 100%-width image, automatically responsive with zero additional CSS. [S1]
+- **Business card composition** — `w3-card` + fixed pixel width + a centered `w3-container` combines earlier Cards-chapter knowledge into a concrete "advanced" milestone example. [S1]
+
+## 📖 세부 내용 (Details)
+- Completing the skeleton's stylesheet link: `<link rel="stylesheet" href="https://www.w3schools.com/w3css/5/w3.css">`. [S1]
+- Styling requires an explicit class even after linking: `<div class="w3-container w3-black"><h1>This is a Heading</h1></div>`. [S1]
+- Responsive 3-image row: `<div class="w3-row"><div class="w3-third"><img src="img_avatar.png" style="width:100%"></div><div class="w3-third">...</div><div class="w3-third">...</div></div>`. [S1]
+- Business card: `<div class="w3-card" style="width:200px"><img src="img_avatar.png" style="width:100%"><div class="w3-container w3-center"><p class="w3-xlarge">John Doe</p><p>Engineer</p></div></div>`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- 현재까지 발견된 모순 사항 없음 (No contradictions found in available sources).
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 3개 이미지를 w3-third로 나란히 배치하는 것만으로 반응형 레이아웃을 얻는 패턴이 스켈레톤에 스타일시트를 연결하는 실전 첫걸음이다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+A responsive 3-column image row requiring zero extra CSS once w3.css is linked (HTML):
+```html
+<div class="w3-row">
+  <div class="w3-third"><img src="img_avatar.png" style="width:100%"></div>
+  <div class="w3-third"><img src="img_avatar.png" style="width:100%"></div>
+  <div class="w3-third"><img src="img_avatar.png" style="width:100%"></div>
+</div>
+```
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual
+- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
+- **신뢰 점수:** 0.84
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[W3.CSS Tutorial]]
+- **관련 개념:** [[W3CSS Web HTML]], [[W3CSS Cards]], [[W3CSS Web JavaScript]]
+- **참조 맥락:** 스켈레톤에 스타일시트 연결하기 — JavaScript 라이브러리 연결(Web JavaScript) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Using a CSS Stylesheet — https://www.w3schools.com/w3css/w3css_web_css.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Using a CSS Stylesheet" page (Astra wiki-curation, P-Reinforce v3.1 format).