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10_Wiki/Topic_Programming/Topic_W3CSS/W3CSS_Cards.md

@@ -0,0 +1,70 @@
+---
+id: w3css-cards
+title: "W3CSS Cards"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["w3-card", "W3.CSS 카드"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.89
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["w3css", "css-framework", "w3schools", "cards"]
+raw_sources: ["https://www.w3schools.com/w3css/w3css_cards.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[W3CSS Cards]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+`w3-hover-shadow` can turn ANY plain element into something that behaves like a card purely on mouse-over — the source notes it uses "the same style as w3-card-4," meaning you can defer the card-like shadow effect to a hover interaction instead of applying it permanently, without needing a separate shadow value. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`w3-card`** — alias for `w3-card-2` (2px bordered shadow). [S1]
+- **`w3-card-2` / `w3-card-4`** — containers with 2px/4px shadow depth respectively. [S1]
+- **Composable with headers/footers** — a card can contain its own `<header>`/`<footer>` with `w3-container`, creating distinct sections inside one card. [S1]
+- **`w3-hover-shadow`** — adds the card-4 shadow effect only on hover, making any plain element look card-like on mouse-over. [S1]
+- **Photo cards** — an `<img>` combined with a `w3-container` caption div inside a `w3-card-4` wrapper. [S1]
+
+## 📖 세부 내용 (Details)
+- Basic card: `<div class="w3-card"><p>w3-card</p></div>`. [S1]
+- Sectioned card with header/footer: `<div class="w3-card-4"><header class="w3-container w3-blue"><h1>Header</h1></header><div class="w3-container"><p>Lorem ipsum...</p></div><footer class="w3-container w3-blue"><h5>Footer</h5></footer></div>`. [S1]
+- Photo card: `<div class="w3-card-4"><img src="img_snowtops.jpg" alt="Alps"><div class="w3-container w3-center"><p>The Italian / Austrian Alps</p></div></div>`. [S1]
+- Hover-only shadow: `<div class="w3-green w3-hover-shadow w3-center"><p>Hover over me!</p></div>`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 친구 요청 카드, 날씨 위젯 카드 등 header+container+footer 조합으로 구성된 복합 카드가 실전 UI 패턴의 대표 사례다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Card-like shadow only on hover (HTML):
+```html
+<div class="w3-green w3-hover-shadow w3-center">
+  <p>Hover over me!</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:** 0.89
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[W3.CSS Tutorial]]
+- **관련 개념:** [[W3CSS Borders]], [[W3CSS Defaults]], [[W3CSS Images]]
+- **참조 맥락:** Basics 섹션의 마지막 — 기본 설정(Defaults) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — W3.CSS Cards — https://www.w3schools.com/w3css/w3css_cards.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "W3.CSS Cards" page (Astra wiki-curation, P-Reinforce v3.1 format).