.back-to-top{position:fixed;z-index:20;right:24px;bottom:90px;width:48px;height:48px;display:flex;align-items:center;justify-content:center;padding:0;border:1px solid #0849a5;border-radius:12px;background:#0849a5;color:#fff;box-shadow:0 4px 18px #08295726;cursor:pointer;transition:background-color .2s,transform .2s}
.back-to-top[hidden]{display:none}
.back-to-top:hover{background:#063b88;transform:translateY(-2px)}
.back-to-top:focus-visible{outline:3px solid #0849a5;outline-offset:4px;box-shadow:0 0 0 4px #fff}
@media(max-width:600px){.back-to-top{right:16px}}
@media(prefers-reduced-motion:reduce){.back-to-top{transition:none}.back-to-top:hover{transform:none}}