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-mixed-columns
+title: "How To - Mixed Column Layout"
+category: "Web_Recipes"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["responsive 4-2-1 column layout"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.83
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["howto", "css", "w3schools", "layout", "float", "responsive", "media-queries"]
+raw_sources: ["https://www.w3schools.com/howto/howto_css_mixed_columns.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[HOWTO CSS Mixed Columns]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+Where `[[HOWTO CSS Four Columns]]` collapsed directly from 4 columns to 1 stacked column at a single breakpoint, this recipe adds an INTERMEDIATE step — two STACKED media queries (900px, then 600px) progressively widen each column's percentage (25% → 50% → 100%) as the screen narrows, demonstrating that responsive breakpoints aren't limited to one "desktop vs. mobile" cutoff; they can chain to create a 4-column → 2-column → 1-column cascade, with each `@media` rule simply overriding the previous width at a narrower threshold. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Base layout: 4 equal float columns** — `.column { float: left; width: 25%; }` plus the standard `.row:after` clearfix. [S1]
+- **First breakpoint (900px): 4 → 2 columns** — `@media (max-width: 900px) { .column { width: 50%; } }`. [S1]
+- **Second breakpoint (600px): 2 → 1 column** — `@media (max-width: 600px) { .column { width: 100%; } }`. [S1]
+- **Cascading override order matters** — later (narrower) media queries must come after earlier (wider) ones in the stylesheet so they correctly override at smaller widths, per normal CSS cascade rules. [S1]
+
+## 📖 세부 내용 (Details)
+- Full progressive layout: `.column { float: left; width: 25%; } .row:after { content: ""; display: table; clear: both; } @media screen and (max-width: 900px) { .column { width: 50%; } } @media screen and (max-width: 600px) { .column { width: 100%; } }`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **단일 브레이크포인트가 아니라 다단계 캐스케이드**: `[[HOWTO CSS Four Columns]]`는 600px 하나의 브레이크포인트로 4열→1열로 바로 붕괴시켰지만, 이 레시피는 900px(4→2열)과 600px(2→1열) 두 단계를 거치는 점진적 붕괴를 사용한다는 점이 확인됨 — 반응형 브레이크포인트가 여러 단계로 연쇄될 수 있음을 보여줌. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+화면 폭에 따라 4열→2열→1열로 점진적으로 바뀌는 컬럼 레이아웃 예제가 원문에서 직접 제시됨. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Progressive breakpoint cascade — 4 columns → 2 → 1 (CSS):
+```css
+.column { float: left; width: 25%; }
+
+@media screen and (max-width: 900px) {
+  .column { width: 50%; }
+}
+@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:** 0.83
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[W3Schools HOW TO]]
+- **관련 개념:** [[HOWTO CSS Four Columns]], [[HOWTO CSS Responsive Floats]], [[HOWTO CSS Two Columns]]
+- **참조 맥락:** CSS Layout & Positioning 섹션.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — How To - Mixed Column Layout — https://www.w3schools.com/howto/howto_css_mixed_columns.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "How To - Mixed Column Layout" recipe (Astra wiki-curation, P-Reinforce v3.1 format).