.back-to-top{position:fixed;right:calc(1rem + env(safe-area-inset-right,0px));bottom:calc(1rem + env(safe-area-inset-bottom,0px));z-index:50;display:inline-flex;align-items:center;justify-content:center;box-sizing:border-box;width:40px;height:40px;padding:0;border:1px solid #c71824;border-radius:50%;background:#c71824;color:#fff;box-shadow:0 2px 10px #0003;cursor:pointer;touch-action:manipulation}
.back-to-top[hidden]{display:none}
.back-to-top svg{flex-shrink:0}
.back-to-top::before{content:"";position:absolute;inset:-2px;border-radius:50%}
.back-to-top:hover{background:#a9131e;color:#fff}
.back-to-top:focus-visible{outline:3px solid #fff;outline-offset:3px;box-shadow:0 0 0 7px #a9131e,0 4px 18px #0005}
body>footer{padding-bottom:calc(6rem + env(safe-area-inset-bottom,0px))}