.shumetto-back-to-top{
  position:fixed;right:max(16px,env(safe-area-inset-right,0px));
  bottom:calc(var(--back-to-top-offset,24px) + env(safe-area-inset-bottom,0px));
  z-index:90;display:grid;place-items:center;box-sizing:border-box;
  width:48px;height:48px;min-width:48px;min-height:48px;padding:0;
  border:1px solid #428de9;border-radius:50%;background:linear-gradient(145deg,#10233e,#07101c);
  color:#e7f3ff;font:600 28px/1 system-ui,sans-serif;
  box-shadow:0 6px 22px #0008;cursor:pointer;touch-action:manipulation;
  transition:background-color .15s ease,box-shadow .15s ease;
}
.shumetto-back-to-top[hidden]{display:none!important}
@media(hover:hover){.shumetto-back-to-top:hover{background:#123969;box-shadow:0 6px 24px #1677ff55}}
.shumetto-back-to-top:focus-visible{outline:3px solid #7cdaff;outline-offset:4px}
.shumetto-back-to-top:active{background:#154b83}
@media(prefers-reduced-motion:reduce){.shumetto-back-to-top{transition:none}}