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). - Dev의 W3Schools 언어 튜토리얼 폴더(Topic_C/CPP/CSS/CSharp/HOWTO/HTML/Java/ 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.
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+---
+id: w3css-borders
+title: "W3CSS Borders"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["w3-border", "w3-leftbar", "W3.CSS 테두리"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.89
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["w3css", "css-framework", "w3schools", "borders"]
+raw_sources: ["https://www.w3schools.com/w3css/w3css_borders.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[W3CSS Borders]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+A border can be made "invisible" yet still functional as a hover trigger — setting `border:16px solid white` on an element paired with `w3-hover-border-green` creates a thick border that's visually undetectable against a white background until hovered, at which point it visibly appears in green, a trick that relies on the border occupying space without being seen. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`w3-border` / `w3-border-{top,right,bottom,left}`** — adds borders to specific sides; `w3-border-0` removes all borders. [S1]
+- **`w3-border-COLOR`** — sets border color (e.g. `w3-border-red`). [S1]
+- **`w3-round-{small,large,xlarge,xxlarge}`** — rounds border corners at different intensities; plain `w3-round` is the default rounding. [S1]
+- **`w3-topbar` / `w3-bottombar` / `w3-leftbar` / `w3-rightbar`** — add THICK single-side borders (heavier than normal `w3-border-*`). [S1]
+- **`w3-hover-border-COLOR`** — changes border color specifically on mouse hover. [S1]
+- **Invisible-until-hover border trick** — a white/matching-background border becomes visible only on hover via `w3-hover-border-*`. [S1]
+
+## 📖 세부 내용 (Details)
+- Directional borders: `<div class="w3-panel w3-border-left"><p>I have only a left border.</p></div>`. [S1]
+- Colored border: `<div class="w3-panel w3-border w3-border-red"><p>I have red borders.</p></div>`. [S1]
+- Thick bar border: `<div class="w3-panel w3-leftbar w3-border-blue w3-pale-blue"><p>I have a thick blue left border and a pale-blue background color.</p></div>`. [S1]
+- Invisible-until-hover: `<div style="border:16px solid white" class="w3-panel w3-hover-border-green"><p>Thick (invisible) border that turns green on hover.</p></div>`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 배경과 같은 색의 두꺼운 테두리를 호버 시에만 드러내는 트릭이 UI 인터랙션 디자인의 대표 실전 사례다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Invisible border that reveals itself on hover (HTML):
+```html
+<div style="border:16px solid white" class="w3-panel w3-hover-border-green">
+  <p>Thick (invisible) border that turns green on hover.</p>
+</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:** 0.89
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[W3.CSS Tutorial]]
+- **관련 개념:** [[W3CSS Panels]], [[W3CSS Cards]], [[W3CSS Round]]
+- **참조 맥락:** 패널의 시각적 강조 도구 — 카드(Cards) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — W3.CSS Borders — https://www.w3schools.com/w3css/w3css_borders.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "W3.CSS Borders" page (Astra wiki-curation, P-Reinforce v3.1 format).