/* TOPへボタン */
#back-to-top {
  position: fixed !important;
  right: 24px;
  bottom: 24px;
  width: 52px !important;
  height: 52px !important;
  border-radius: 50%;
  background: #222;
  color: #fff;
  display: flex !important;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
  z-index: 999;
  overflow: hidden;
}

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

#back-to-top svg {
  width: 20px !important;
  height: 20px !important;
  max-width: 20px !important;
  fill: currentColor;
}
@media (max-width: 767px) {
  #back-to-top {
    right: 16px;
    bottom: 16px;
    width: 44px;
    height: 44px;
  }
}

/* ページ内リンクのスムーズスクロール */
html {
  scroll-behavior: smooth;
}