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: w3css-dark-mode
+title: "W3CSS Dark Mode"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["dark mode toggle", "classList.toggle", "W3.CSS 다크모드"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.86
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["w3css", "css-framework", "w3schools", "dark-mode", "javascript"]
+raw_sources: ["https://www.w3schools.com/w3css/w3css_darkmode.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[W3CSS Dark Mode]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+W3.CSS has no dedicated "dark mode system" at all — the entire feature is just one line of vanilla JavaScript (`document.body.classList.toggle("w3-black")`) reusing the SAME `w3-black` color utility class that exists for ordinary styling, showing that a UI framework doesn't need special-purpose infrastructure to support a feature if its utility classes are composable enough. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **No dedicated dark-mode API** — dark mode is achieved by toggling an ordinary color class, not a purpose-built framework feature. [S1]
+- **`classList.toggle("w3-black")`** — native JavaScript DOM API that adds the class if absent, removes it if present — the toggle behavior needs zero custom logic. [S1]
+- **`document.body`** — the toggle target is typically the whole page body, switching the entire page's background. [S1]
+
+## 📖 세부 내용 (Details)
+- Full dark-mode toggle implementation: `<script>function myFunction() { let x = document.body; x.classList.toggle("w3-black"); }</script>` — attached to a button's `onclick`. [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 — 색상 유틸리티 클래스를 토글하는 것만으로 다크모드를 구현하는 최소주의 패턴이 실전에서 그대로 재사용 가능한 기법이다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Toggling dark mode by reusing an ordinary color utility class (JavaScript):
+```html
+<button onclick="myFunction()">Turn on/off Dark Mode</button>
+<script>
+function myFunction() {
+  let x = document.body;
+  x.classList.toggle("w3-black");
+}
+</script>
+```
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual
+- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
+- **신뢰 점수:** 0.86
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[W3.CSS Tutorial]]
+- **관련 개념:** [[W3CSS Colors]], [[W3CSS Animate]]
+- **참조 맥락:** Effects 섹션 첫 항목 — 애니메이션(Animate) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — W3.CSS Dark Mode — https://www.w3schools.com/w3css/w3css_darkmode.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "W3.CSS Dark Mode" page (Astra wiki-curation, P-Reinforce v3.1 format).