🎨 Palette: 버튼 클릭 시 시각적 피드백(:active) 추가

.Jules/palette.md

@@ -21,3 +21,7 @@
 ## 2024-07-15 - Expand clickable area of project cards
 **Learning:** Using an anchor tag to wrap an entire card (block-level element) can result in verbose and confusing screen reader output. However, restricting the clickable area to just the title makes the UI harder to interact with (violating Fitts's Law).
 **Action:** Apply `position: relative` to the card container and use a `::after` pseudo-element with `position: absolute; inset: 0;` on the title's anchor tag. This expands the clickable area to the whole card while keeping semantic and accessible HTML structure.
+
+## 2026-08-05 - Add :active state for tactile feedback
+**Learning:** Found that buttons only have `:hover` states but no `:active` states. Without an `:active` state, users don't get immediate tactile visual feedback when they click, making the UI feel less responsive and slightly disconnected.
+**Action:** Always add an `:active` state (e.g., using `transform: scale(0.98)`) to interactive button elements so users receive immediate, clear feedback upon interaction.

CHANGELOG.md

@@ -1,6 +1,7 @@
 # CHANGELOG
 
 ## [Unreleased]
+- **UX 개선**: 버튼(`.button`, `.language-switch button`) 클릭 시 스케일이 줄어드는 `:active` 상태를 추가하여 즉각적인 시각적 촉각 피드백을 제공하도록 개선했습니다.
 - **UX/접근성 개선**: 프로젝트 카드의 클릭 영역을 카드 전체로 확장하여 사용자 편의성을 높였습니다. <a> 태그를 확장하는 대신 가상 요소(pseudo-element) 겹침 방식을 사용하여 스크린 리더 접근성을 유지했습니다.
 - **보안 개선**: 컴포넌트 갤러리의 인라인 스크립트와 스타일을 외부 파일로 분리하고, 엄격한 Content-Security-Policy를 적용해 XSS 방어를 강화했습니다.
 - **성능 회귀 복원**: 오프스크린 `.section` 렌더링을 `content-visibility: auto`로 지연하고, 일반 섹션은 600px·콘텐츠가 큰 DIKW/projects 섹션은 1000px의 `contain-intrinsic-size` placeholder를 유지해 초기 렌더링 비용과 스크롤바 이동을 함께 줄였습니다.

styles.css

@@ -108,13 +108,17 @@ a {
   font-size: 13px;
   font-weight: 850;
   cursor: pointer;
-  transition: opacity 0.2s;
+  transition: opacity 0.2s, transform 0.1s;
 }
 
 .language-switch button:not([aria-pressed="true"]):hover {
   opacity: 0.8;
 }
 
+.language-switch button:active {
+  transform: scale(0.92);
+}
+
 .language-switch button[aria-pressed="true"] {
   background: var(--ink);
   color: var(--white);
@@ -218,13 +222,17 @@ h1 {
   text-decoration: none;
   font-size: 15px;
   font-weight: 800;
-  transition: opacity 0.2s;
+  transition: opacity 0.2s, transform 0.1s;
 }
 
 .button:hover {
   opacity: 0.8;
 }
 
+.button:active {
+  transform: scale(0.98);
+}
+
 .button.primary {
   background: var(--ink);
   color: var(--white);

tests/test_styles.py

@@ -59,3 +59,19 @@ def test_project_cards_are_fully_clickable_via_pseudo_element():
     after_rule = _rule(".project-grid h3 a::after")
     assert "position: absolute;" in after_rule
     assert "inset: 0;" in after_rule
+
+def test_buttons_have_active_transform_feedback():
+    """Buttons should have an :active state with transform scaling for tactile feedback."""
+    button_rule = _rule(".button")
+    assert "transition:" in button_rule
+    assert "transform" in button_rule
+
+    active_rule = _rule(".button:active")
+    assert "transform: scale(" in active_rule
+
+    lang_button_rule = _rule(".language-switch button")
+    assert "transition:" in lang_button_rule
+    assert "transform" in lang_button_rule
+
+    lang_active_rule = _rule(".language-switch button:active")
+    assert "transform: scale(" in lang_active_rule