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-responsive
+title: "W3CSS Responsive"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["12-column grid", "w3-col", "W3.CSS 반응형 유동 그리드"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.88
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["w3css", "css-framework", "w3schools", "responsive", "grid"]
+raw_sources: ["https://www.w3schools.com/w3css/w3css_responsive.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[W3CSS Responsive]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+The `s`/`m`/`l` column-size prefixes CASCADE upward — specifying only `s6` (small-screen 6-of-12) is enough for ALL screen sizes, while specifying only `m6` (medium) leaves SMALL screens undefined and defaulting to 100% width — meaning you only need to declare the LARGEST breakpoint tier you want to differ from full-width, not every tier explicitly. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **12-column system** — `w3-col` defines a column; `s1`-`s12`/`m1`-`m12`/`l1`-`l12` set its width fraction for small/medium/large screens respectively (each unit ≈ 8.33%). [S1]
+- **Cascading defaults** — specifying only the small-screen class applies it everywhere; specifying only medium/large leaves small screens at 100% (full stack) unless also specified. [S1]
+- **Columns per row must sum to 12** — e.g. 6+6, 3+3+6, 9+3 — a structural rule for the grid to add up correctly. [S1]
+- **Mixed breakpoint combinations** — a single column can combine `l3 m6 s4` to have entirely different fractions at each screen tier simultaneously. [S1]
+- **`w3-hide-small` / `w3-hide-medium` / `w3-hide-large`** — hides content entirely at specific breakpoints (small <601px, large >992px). [S1]
+- **`w3-content`** — a centered, fixed-max-width container; override the default 980px via CSS `max-width`. [S1]
+
+## 📖 세부 내용 (Details)
+- Mixed multi-tier layout: `<div class="w3-col l3 m6 s4 w3-green">...</div><div class="w3-col l7 m3 s4 w3-dark-grey">...</div><div class="w3-col l2 m3 s4 w3-red">...</div>` — produces 25%/58.34%/16.66% on large, 50%/25%/25% on medium, and 33.3% each on small screens, from ONE set of markup. [S1]
+- Centered content container: `<body class="w3-content" style="max-width:500px">page content...</body>`. [S1]
+- Hiding on specific breakpoints: `<div class="w3-container w3-hide-small w3-red">...</div>`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **열 크기 클래스의 계단식 기본값**: small 클래스만 지정하면 모든 화면에 적용되지만, medium/large만 지정하면 small 화면에서는 자동으로 100%가 된다는 점이 명시적으로 설명됨. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — l3/m6/s4처럼 화면별로 완전히 다른 비율을 하나의 마크업으로 표현하는 것이 반응형 그리드의 핵심 실전 활용이다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+One column with different width fractions per screen tier (HTML):
+```html
+<div class="w3-row">
+  <div class="w3-col l3 m6 s4 w3-green"><p>l3 m6 s4</p></div>
+  <div class="w3-col l7 m3 s4 w3-dark-grey"><p>l7 m3 s4</p></div>
+  <div class="w3-col l2 m3 s4 w3-red"><p>l2 m3 s4</p></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:** 0.88
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[W3.CSS Tutorial]]
+- **관련 개념:** [[W3CSS Cells]], [[W3CSS Rows]], [[W3CSS Dark Mode]]
+- **참조 맥락:** Grid & Flexbox 섹션의 마지막 — 다크모드(Dark Mode) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — W3.CSS Responsive Fluid Grid — https://www.w3schools.com/w3css/w3css_responsive.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "W3.CSS Responsive Fluid Grid" page (Astra wiki-curation, P-Reinforce v3.1 format).