docs(10_Wiki): Topic_Business/General/Graphic/Programming을 Topics/ 하위로 이동

최상위 10_Wiki/Topic_*였던 4개 카테고리 폴더를 10_Wiki/Topics/Topic_* 로 재배치. 콘텐츠 변경 없음(순수 폴더 이동) — Topics/ 하위 나머지 폴더는 이미 지난 커밋에서 전부 정리된 상태(잔존 항목은 에이전트 운영 상태 및 사용자가 보존을 요청한 업데이트0615/무제 3.canvas 뿐).
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+---
+id: w3css-effects
+title: "W3CSS Effects"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["w3-opacity", "w3-grayscale", "w3-sepia", "hover effects", "W3.CSS 이펙트"]
+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", "effects", "hover"]
+raw_sources: ["https://www.w3schools.com/w3css/w3css_effects.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[W3CSS Effects]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+Effect classes and color classes are designed to STACK, not replace each other — combining `w3-hover-opacity` with any `w3-hover-<color>` class (e.g. `w3-hover-red`) produces a lighter/softer version of that hover color, meaning the effects system was built as a compositional layer on top of the existing color system rather than a standalone feature. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Opacity tiers** — `w3-opacity-min` (0.75), `w3-opacity` (0.6), `w3-opacity-max` (0.25) — three fixed transparency levels, no arbitrary values. [S1]
+- **Grayscale tiers** — `w3-grayscale-min` (50%), `w3-grayscale` (75%), `w3-grayscale-max` (100%) — **not supported in IE 11 and earlier**. [S1]
+- **Sepia tiers** — `w3-sepia-min` (50%), `w3-sepia` (75%), `w3-sepia-max` (100%) — also **not supported in IE 11 and earlier**. [S1]
+- **Hover variants** — `w3-hover-opacity`, `w3-hover-grayscale`, `w3-hover-sepia` — apply the effect only on mouse-over, not by default. [S1]
+- **Stacking hover-opacity with hover-color** — combining `w3-hover-opacity` with a `w3-hover-<color>` class softens/lightens that hover color. [S1]
+
+## 📖 세부 내용 (Details)
+- Three opacity tiers on images: `<img src="image.jpg" class="w3-opacity-min"><img src="image.jpg" class="w3-opacity"><img src="image.jpg" class="w3-opacity-max">`. [S1]
+- Hover-only effects: `<img src="image.jpg" class="w3-hover-opacity"><img src="image.jpg" class="w3-hover-grayscale"><img src="image.jpg" class="w3-hover-sepia">`. [S1]
+- Combined hover color + opacity: `<div class="w3-border w3-hover-opacity w3-hover-red"><p>w3-hover-red with w3-hover-opacity</p></div>` — produces a lighter red on hover than `w3-hover-red` alone. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **IE 11 호환성 경고**: w3-grayscale 계열과 w3-sepia 계열 클래스 모두 IE 11 이하 버전에서 지원되지 않는다고 원문에 명시됨 — 구형 브라우저 지원이 필요한 프로젝트에서는 주의 필요. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — hover-opacity와 hover-color를 조합해 부드러운 호버 색상을 만드는 조합 기법이 실전 UI 디테일 작업의 대표 활용 사례다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Stacking hover-opacity with a hover-color class for a softened hover effect (HTML/CSS):
+```html
+<div class="w3-border w3-hover-opacity w3-hover-red">
+  <p>w3-hover-red with w3-hover-opacity</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:** 0.86
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[W3.CSS Tutorial]]
+- **관련 개념:** [[W3CSS Animate]], [[W3CSS Colors]], [[W3CSS Bars]]
+- **참조 맥락:** Effects 섹션 마지막 — 네비게이션 바(Bars) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — W3.CSS Effects — https://www.w3schools.com/w3css/w3css_effects.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "W3.CSS Effects" page (Astra wiki-curation, P-Reinforce v3.1 format).