/* ===== PageTop 基本 ===== */
.c-pagetop{
    position: fixed;
    right: calc(50% - 180px);
    bottom: 16px;
    width: 64px;      
    display: grid;
    place-items: center;
    z-index: 1000;
    border-radius: 999px;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;        /* 非表示時にクリック不可 */
    transition: opacity .3s ease, transform .3s ease, visibility 0s linear .3s;
  }
  .c-pagetop.is-show{
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
    transition: opacity .3s ease, transform .3s ease;
  }
  
  /* ホバー/フォーカス */
  .c-pagetop:is(:hover, :focus-visible){
    transform: translateY(-2px);
    /* box-shadow: 0 6px 14px rgba(0,0,0,.18); */
    outline: none;
  }
  
  /* Reduced motion 配慮 */
  @media (prefers-reduced-motion: reduce){
    .c-pagetop{ transition: none; }
  }