.backToTopBtn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 9999;

    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: none;

    background-color: var(--themed-background);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;

    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;

    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.25);
  }

  .backToTopBtn:hover {
    transform: scale(1.1); /* Slight zoom */
  }

  .backToTopBtn.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  /* Slightly smaller / closer to edge on mobile */
  @media (max-width: 600px) {
    .backToTopBtn {
      width: 44px;
      height: 44px;
      bottom: 20px;
      right: 20px;
    }
  }