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

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.text-char {
  display: inline-block;
  opacity: 0;
  animation: fadeIn 0.5s ease-out forwards;
}

.catchphrase-bg {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.catchphrase-line {
  display: inline-block;
  width: fit-content;
  padding: 0.75rem 1.5rem;
  background-color: #1e3a8a; /* blue-900 */
  opacity: 0;
  animation: fadeIn 0.8s ease-out forwards;
}

/* TOPへ戻るボタン：300pxスクロールで表示 */
#back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
}