.back-to-top{position:fixed;right:24px;bottom:calc(24px + env(safe-area-inset-bottom,0px));z-index:90;display:flex;align-items:center;justify-content:center;width:48px;height:48px;border:1px solid #ffffff88;border-radius:50%;background:#006fba;color:#fff;box-shadow:0 4px 18px #0a274329;cursor:pointer;transition:background .18s,transform .18s}.back-to-top[hidden]{display:none}.back-to-top:hover{background:#00558f;transform:translateY(-2px)}.back-to-top:focus-visible{outline:3px solid #e0aa45;outline-offset:4px}.back-to-top svg{width:22px;height:22px;pointer-events:none}@media(max-width:620px){.back-to-top{right:16px;bottom:calc(16px + env(safe-area-inset-bottom,0px));width:44px;height:44px}}@media(prefers-reduced-motion:reduce){.back-to-top{transition:none}}