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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+---
+id: howto-css-four-columns
+title: "How To - Four Column Layout"
+category: "Web_Recipes"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["4 column grid CSS float"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.82
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["howto", "css", "w3schools", "layout", "float", "responsive"]
+raw_sources: ["https://www.w3schools.com/howto/howto_css_four_columns.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[HOWTO CSS Four Columns]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+Four equal columns is just `width: 25%` (100% ÷ 4 columns) applied to `float: left` children — the SAME clearfix-plus-float pattern already seen in the About Page and Equal Height recipes, confirming that "N equal float columns" always reduces to `width: (100/N)%` plus a `::after` clearfix on the row, regardless of whether N is 2, 3, or 4. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`width: 25%` for 4 equal columns** — the float-width formula generalizes as `100% / N` for N equal columns. [S1]
+- **`.row:after` clearfix** — required whenever floated columns are used, to prevent the row container from collapsing. [S1]
+- **Single-breakpoint responsive collapse** — `@media (max-width: 600px) { .column { width: 100%; } }` stacks all four columns vertically below 600px, with no intermediate 2-column step (contrast with Mixed Column Layout, which adds an intermediate breakpoint). [S1]
+
+## 📖 세부 내용 (Details)
+- Base layout: `.column { float: left; width: 25%; } .row:after { content: ""; display: table; clear: both; }`. [S1]
+- Responsive collapse: `@media screen and (max-width: 600px) { .column { width: 100%; } }`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+없음 — 신규 레시피, 기존 문서와 모순되는 내용 없음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+4개의 동일한 폭 컬럼을 만들고, 600px 미만 화면에서 전부 세로로 쌓이게 하는 예제가 원문에서 직접 제시됨. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Four equal float columns with a single responsive breakpoint (CSS):
+```css
+.column { float: left; width: 25%; }
+.row:after { content: ""; display: table; clear: both; }
+
+@media screen and (max-width: 600px) {
+  .column { width: 100%; }
+}
+```
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual
+- **출처 신뢰도:** B (W3Schools — widely used educational reference)
+- **신뢰 점수:** 0.82
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[W3Schools HOW TO]]
+- **관련 개념:** [[HOWTO CSS Mixed Columns]], [[HOWTO CSS Three Columns]], [[HOWTO CSS Two Columns]], [[HOWTO CSS Equal Height]]
+- **참조 맥락:** CSS Layout & Positioning 섹션.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — How To - Four Column Layout — https://www.w3schools.com/howto/howto_css_four_columns.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "How To - Four Column Layout" recipe (Astra wiki-curation, P-Reinforce v3.1 format).