.back-top{position:fixed;right:16px;bottom:18px;z-index:90;min-width:58px;height:32px;padding:0 10px;border:1px solid rgba(120,145,175,.26);border-radius:999px;background:rgba(255,255,255,.60);color:rgba(40,70,105,.60);box-shadow:0 6px 18px rgba(15,34,68,.09);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);font-size:12px;font-weight:800;line-height:1;cursor:pointer;opacity:0;pointer-events:none;transform:translateY(8px);transition:opacity .18s ease,transform .18s ease,background .18s ease,color .18s ease}.back-top.show{opacity:.42;pointer-events:auto;transform:translateY(0)}.back-top:hover{opacity:.78;background:rgba(255,255,255,.9);color:#1a56c8}.back-top:active{transform:translateY(1px)}@media(max-width:768px){.back-top{right:12px;bottom:calc(14px + env(safe-area-inset-bottom));min-width:54px;height:30px;padding:0 9px;font-size:11px}.back-top.show{opacity:.36}.detail-overlay.show~.back-top,.detail-overlay.show+.back-top{display:none}}