#reading-progress{position:fixed;top:0;left:0;height:3px;width:0%;background:#fff;z-index:999997;transition:width .1s linear;}
#back-to-top{position:fixed;right:24px;bottom:24px;width:46px;height:46px;border-radius:50%;background:#141414;border:1px solid rgba(255,255,255,.15);display:flex;align-items:center;justify-content:center;cursor:pointer;opacity:0;visibility:hidden;transform:translateY(10px);transition:opacity .3s ease,transform .3s ease,background .2s ease;z-index:999990;padding:0;box-shadow:0 8px 20px rgba(0,0,0,.25);}
#back-to-top.is-visible{opacity:1;visibility:visible;transform:translateY(0);}
#back-to-top:hover{background:#000;}
#back-to-top svg{width:20px;height:20px;stroke:#fff;fill:none;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round;}
@media (max-width:549px){ #back-to-top{right:14px;bottom:14px;width:42px;height:42px;} }
@media (prefers-reduced-motion: reduce){ #back-to-top{transition:opacity .01s;} }