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Antigravity Agent c24165b8bc 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>

2026-07-11 11:05:56 +09:00

4.9 KiB

Raw Blame History

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title

CSS Opacity

🎯 한 줄 통찰 (One-line insight)

The opacity property sets how transparent an element is on a 0.0–1.0 scale, but because it affects the whole element (including children), rgba() is preferred when only the background should be see-through. [S1]

🧠 핵심 개념 (Core concepts)

opacity property — specifies the opacity/transparency of an element. [S1]
Value range — 0.0 is completely transparent, 1.0 is fully opaque. [S1]
Hover interaction — opacity can change on :hover to fade images in or out. [S1]
RGBA alternative — rgba() adds a fourth alpha value (0.0–1.0) to a color, making only that color transparent. [S1]

🧩 추출된 패턴 (Extracted patterns)

Fade-on-hover — pair a base opacity with an :hover opacity to brighten or dim images on pointer-over. [S1]
Transparent background only — use rgba() on background-color so the text/children stay fully opaque while the background is see-through. [S1]
Text-in-transparent-box — layer a transbox with an rgba() background over a patterned background div. [S1]

📖 세부 내용 (Details)

Opacity property [S1] The opacity property specifies the opacity/transparency of an element. It can take a value from 0.0 to 1.0, where 0.0 is completely transparent and 1.0 is fully opaque.

Basic image opacity:

img {
  opacity: 0.5;
}

Transparent image that becomes opaque on hover:

img {
  opacity: 0.5;
}

img:hover {
  opacity: 1.0;
}

Reversed hover effect (opaque image fades on hover):

img:hover {
  opacity: 0.5;
}

Transparent box:

div {
  opacity: 0.3;
}

Transparency using RGBA [S1] RGBA color values add a fourth alpha channel that specifies the opacity of the color, so only the background becomes transparent:

div {
  background: rgba(4, 170, 109, 0.3) /* Green background with 30% opacity */
}

Text in a transparent box [S1]

<html>
<head>
<style>
div.background {
  background: url(klematis.jpg) repeat;
  border: 2px solid black;
}

div.transbox {
  margin: 30px;
  background-color: rgba(255, 255, 255, 0.6);
  border: 1px solid black;
}

div.transbox p {
  margin: 5%;
  font-weight: bold;
  color: #000000;
}
</style>
</head>
<body>

<div class="background">
  <div class="transbox">
    <p>This is some text that is placed in the transparent box.</p>
  </div>
</div>

</body>
</html>

🛠️ 적용 사례 (Applied in summary)

The page's applied examples are the half-opacity image, hover fade-in/fade-out images, the 30%-opacity div, the RGBA green background, and the text-in-transparent-box layout. No external project/commit applications found in the source.

💻 코드 패턴 (Code patterns)

Fade image in on hover (language: CSS):

img {
  opacity: 0.5;
}

img:hover {
  opacity: 1.0;
}

Transparent background only, via RGBA (language: CSS):

div {
  background: rgba(255, 255, 255, 0.6);
}

⚖️ 비교 및 선택 기준 (Comparison & decision criteria)

opacity vs rgba() — The source distinguishes the two: opacity applies to the whole element and is shown fading entire images/boxes, whereas the "Transparency using RGBA" approach applies the alpha only to a color so a background can be transparent without dimming its content. Use opacity to fade an element as a whole; use rgba() when only the background color should be transparent (as in the text-in-transparent-box example). [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

No contradictions found in the source.

✅ 검증 상태 및 신뢰도

상태: draft
검증 단계: conceptual (실제 적용 사례 발견 시 applied/validated로 승격 가능)
출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
신뢰 점수: 0.88
중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

상위/루트: CSS Tutorial
관련 개념: CSS Colors, CSS Backgrounds, CSS Images
참조 맥락: Referenced when fading elements or making backgrounds see-through.

📚 출처 (Sources)

[S1] W3Schools — CSS Opacity — https://www.w3schools.com/css/css_image_transparency.asp

📝 변경 이력 (Change history)

2026-06-23: Initial draft synthesized from the W3Schools "CSS Opacity" page (Astra wiki-curation, P-Reinforce v3.1 format).

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