refactor(topics): 멀티 에이전트용 지식 재편 — _Common(공통 기본기) + Domain_* 구조
에이전트 8종(대화형/프로그래머 C·S/디자이너/설계자/기획자/QA/PD/PM)에게 [공통 기본 능력 + 롤별 Specialty] 2층으로 지식을 주입하기 위한 재분류. 문서 내용·포맷은 무수정, 폴더 이동만 (6,372개 문서 수 보존 확인). - Topic_Programming → Domain_Programming (내부 구조 보존) - Topic_Graphic → Domain_Design - Topic_Business → Domain_Product - Topic_General → Domain_General - _Common 신설: Math(구 Topic_Math_Specialty), Reasoning(구 General/From_Thinking & Reasoning), Reasoning_Creativity(구 General/From_창의성), Communication(Poetic_Blog_Writing + From_writing) - 타 도메인의 From_* 폴더는 유지 (출처 표기일 뿐, 이미 도메인에 맞게 분류된 문서) - 빈 폴더 정리 (memory/procedures) - 에이전트→폴더 매핑은 workspace의 .astra/agent-knowledge-map.json (9개 에이전트) Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Antigravity Agent
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---
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id: css-dropdowns
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title: "CSS Dropdowns"
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category: "Frontend"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["dropdown", "CSS dropdown menu", "hover dropdown", "dropdown box", "pure CSS dropdown"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.89
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created_at: 2026-06-23
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updated_at: 2026-06-23
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review_reason: ""
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merge_history: []
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tags: ["css", "web", "frontend", "w3schools", "dropdown", "hover", "menu"]
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raw_sources: ["https://www.w3schools.com/css/css_dropdowns.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS Dropdowns]]
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## 🎯 한 줄 통찰 (One-line insight)
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A CSS dropdown reveals hidden content on hover by combining a `position: relative` wrapper, an absolutely positioned `display: none` content box, and a `:hover` rule that flips it to `display: block` — no JavaScript required. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Dropdown** — a UI element that displays content (text, links, images) when the user moves over or interacts with a trigger element such as a `div`, `button`, `p`, or `a`. [S1]
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- **Wrapper positioning** — the outer `.dropdown` container is given `position: relative` so the dropdown content can be positioned relative to it. [S1]
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- **Hidden-by-default content** — `.dropdown-content` starts at `display: none` and `position: absolute`, so it does not occupy space until shown. [S1]
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- **Hover reveal** — the `.dropdown:hover .dropdown-content` rule sets `display: block`, exposing the content while the pointer is over the wrapper. [S1]
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- **Visual depth** — a `box-shadow` is used to give the dropdown box a floating, layered appearance. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Relative-parent / absolute-child** — pair a `position: relative` wrapper with a `position: absolute` content box so the box anchors to the wrapper. [S1]
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- **Hover toggle** — switch a child from `display: none` to `display: block` via a parent `:hover` descendant selector, achieving show/hide without scripting. [S1]
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- **Styled trigger button** — a `.dropbtn` class styles the trigger (background color, padding, no border, pointer cursor) and changes color on parent hover. [S1]
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## 📖 세부 내용 (Details)
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**What is a CSS dropdown?**
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A CSS dropdown is a UI element that displays content when users click or hover over a trigger element like a button or link. The trigger can be a `div`, `button`, `p`, or `a` tag, and the hidden dropdown content displays on interaction. [S1]
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**Example 1 — Dropdown Box with Text**
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A basic hoverable dropdown. The parent uses `position: relative`; the `.dropdown-content` is hidden (`display: none`) and absolutely positioned, with a `min-width` of `130px` and a `box-shadow` for depth. The `:hover` selector reveals it: [S1]
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```html
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<style>
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.dropdown {
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position: relative;
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}
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.dropdown-content {
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display: none;
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position: absolute;
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background-color: #f9f9f9;
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min-width: 130px;
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box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
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padding: 12px 16px;
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}
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.dropdown:hover .dropdown-content {
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display: block;
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}
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</style>
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<div class="dropdown">Mouse over me!
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<div class="dropdown-content">Hello World!</div>
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</div>
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```
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**Example 2 — Dropdown Menu**
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Extends the dropdown into an interactive menu. A styled `.dropbtn` button (green `#4CAF50` background, white text, `16px` padding) triggers the menu; links inside `.dropdown-content` are block-level with padding and no underline, and change background on hover. The button darkens (`#3e8e41`) when the dropdown is hovered: [S1]
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```html
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<style>
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.dropdown {
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position: relative;
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}
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/* Style the dropdown button */
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.dropbtn {
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background-color: #4CAF50;
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color: white;
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padding: 16px;
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font-size: 16px;
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border: none;
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cursor: pointer;
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}
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/* Dropdown content */
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.dropdown-content {
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display: none;
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position: absolute;
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background-color: #f9f9f9;
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min-width: 200px;
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box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
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}
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/* Links inside dropdown content */
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.dropdown-content a {
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color: black;
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padding: 12px 16px;
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text-decoration: none;
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display: block;
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}
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/* Change color of dropdown links on hover */
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.dropdown-content a:hover {
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background-color: #f1f1f1
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}
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/* Show the dropdown content on hover */
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.dropdown:hover .dropdown-content {
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display: block;
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}
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/* Change background color of dropdown button on hover */
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.dropdown:hover .dropbtn {
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background-color: #3e8e41;
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}
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</style>
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<div class="dropdown">
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<button class="dropbtn">Dropdown Menu</button>
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<div class="dropdown-content">
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<a href="#">Link 1</a>
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<a href="#">Link 2</a>
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<a href="#">Link 3</a>
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</div>
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</div>
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```
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## 🛠️ 적용 사례 (Applied in summary)
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The two examples on the page are the applied demonstrations: a text dropdown box and a link-based dropdown menu, both shown as complete self-contained markup. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Core relative-parent / hover-reveal pattern (language: CSS):
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```css
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.dropdown {
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position: relative;
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}
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.dropdown-content {
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display: none;
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position: absolute;
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}
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.dropdown:hover .dropdown-content {
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display: block;
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}
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```
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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No contradictions found in the source.
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual (실제 적용 사례 발견 시 applied/validated로 승격 가능)
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.89
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[CSS Tutorial]]
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- **관련 개념:** [[CSS Advanced Dropdowns]], [[CSS Position]], [[CSS Navigation Bar]]
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- **참조 맥락:** Referenced whenever building hoverable menus, tooltips, or pop-over content panels in pure CSS.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS Dropdowns — https://www.w3schools.com/css/css_dropdowns.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Dropdowns" page (Astra wiki-curation, P-Reinforce v3.1 format).
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