fix(auth): 다크 폼 입력·비밀번호 토글 스타일 보정

- .auth-form-input 전역 클래스(글자색·캐럿·placeholder·autofill)
- 토글 버튼 scoped CSS로 고정, signup 패널 보더·배경·color-scheme
- v0.0.62 문서 반영

Co-authored-by: Cursor <cursoragent@cursor.com>

components/auth/AuthPasswordVisibilityToggle.vue

@@ -10,7 +10,6 @@ const props = defineProps({
   },
   /**
    * 스크린 리더용 필드 이름(예: 비밀번호 확인)
-   * @type {string}
    */
   fieldName: {
     type: String,
@@ -44,33 +43,27 @@ const toggle = () => {
 
 <template>
   <button
-    class="auth-password-visibility-toggle flex h-10 shrink-0 items-center justify-center px-2.5 text-[#9ba3af] outline-none transition-opacity hover:opacity-80 focus-visible:ring-2 focus-visible:ring-[#2f6feb]/50"
+    class="auth-password-visibility-toggle"
     type="button"
     :aria-label="modelValue ? labelFor('hide') : labelFor('show')"
     :aria-pressed="modelValue"
     @click="toggle"
   >
-    <!-- 비밀번호 숨김 상태: 보기(눈 열림) -->
     <svg
       v-if="!modelValue"
-      class="auth-password-visibility-toggle__icon h-5 w-5"
+      class="auth-password-visibility-toggle__icon"
       xmlns="http://www.w3.org/2000/svg"
       viewBox="0 0 24 24"
-      width="24"
-      height="24"
       fill="currentColor"
       aria-hidden="true"
     >
       <path d="M12 4.5C7 4.5 2.73 7.61 1 12c1.73 4.39 6 7.5 11 7.5s9.27-3.11 11-7.5c-1.73-4.39-6-7.5-11-7.5zM12 17c-2.76 0-5-2.24-5-5s2.24-5 5-5 5 2.24 5 5-2.24 5-5 5zm0-8c-1.66 0-3 1.34-3 3s1.34 3 3 3 3-1.34 3-3-1.34-3-3-3z" />
     </svg>
-    <!-- 비밀번호 표시 상태: 숨기기(눈 가림) -->
     <svg
       v-else
-      class="auth-password-visibility-toggle__icon h-5 w-5"
+      class="auth-password-visibility-toggle__icon"
       xmlns="http://www.w3.org/2000/svg"
       viewBox="0 0 24 24"
-      width="24"
-      height="24"
       fill="currentColor"
       aria-hidden="true"
     >
@@ -78,3 +71,36 @@ const toggle = () => {
     </svg>
   </button>
 </template>
+
+<style scoped>
+.auth-password-visibility-toggle {
+  display: flex;
+  height: 2.5rem;
+  flex-shrink: 0;
+  align-items: center;
+  justify-content: center;
+  padding-left: 0.625rem;
+  padding-right: 0.625rem;
+  margin: 0;
+  border: none;
+  background: transparent;
+  color: #9ba3af;
+  cursor: pointer;
+  outline: none;
+}
+
+.auth-password-visibility-toggle:hover {
+  opacity: 0.85;
+}
+
+.auth-password-visibility-toggle:focus-visible {
+  outline: 2px solid rgba(47, 111, 235, 0.55);
+  outline-offset: 2px;
+}
+
+.auth-password-visibility-toggle__icon {
+  display: block;
+  width: 1.25rem;
+  height: 1.25rem;
+}
+</style>