/* ---------------------------------------------------------------
 * vb-scroll-top — 스크롤 탑 버튼 스타일
 *
 * 의존성: style.css (:root CSS 커스텀 프로퍼티)
 * --------------------------------------------------------------- */
.scroll-top {
  position: fixed;
  bottom: calc(2rem + env(safe-area-inset-bottom, 0px));
  right: 2rem;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border-color);
  border-radius: 50%;
  background-color: var(--white-color);
  color: var(--black-color);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.3s, visibility 0.3s, transform 0.3s, background-color 0.2s, color 0.2s;
  z-index: 9000;
  box-shadow: 0 18px 45px rgba(15, 9, 3, 0.12);
}

.scroll-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-top:hover {
  background-color: var(--primary-color);
  color: var(--white-color);
  border-color: var(--primary-color);
}