/* Page navigation, independent of practice canvas controls. */
#back-to-top{position:fixed;right:max(18px,env(safe-area-inset-right));bottom:calc(24px + env(safe-area-inset-bottom));z-index:24;display:grid;place-items:center;width:48px;height:48px;min-width:48px;padding:0;border:1px solid #dce5df;border-radius:50%;background:#173c36;color:#fff;box-shadow:0 4px 18px #173c3629;cursor:pointer;touch-action:manipulation;-webkit-tap-highlight-color:transparent}
#back-to-top[hidden]{display:none!important}
#back-to-top svg{width:24px;height:24px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
#back-to-top:hover{background:#28594e;color:#fff}
#back-to-top:focus-visible{outline:3px solid #71954a;outline-offset:4px}
body.rotation-guide-open #back-to-top,body.compact-ui #back-to-top{display:none}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto!important}}