.back-disc{z-index:30;top:24px;left:var(--edge);width:40px;height:40px;color:var(--text-secondary);background:var(--glass-sheen) padding-box, linear-gradient(var(--glass-fill-deep), var(--glass-fill-deep)) padding-box, var(--glass-rim-border);-webkit-backdrop-filter:blur(var(--glass-blur-deep));backdrop-filter:blur(var(--glass-blur-deep));box-shadow:var(--glass-lift), var(--glass-hairline), var(--glass-drop);border:1px solid #0000;border-radius:50%;place-items:center;padding:0;transition:color .18s,background-color .18s,box-shadow .18s;display:grid;position:fixed}.back-disc svg{fill:none;stroke:currentColor;stroke-width:1.6px;stroke-linecap:round;stroke-linejoin:round;width:16px;height:16px}.back-disc:hover{color:var(--ink)}.back-disc:focus-visible{outline:2px solid var(--ground);outline-offset:-4px;box-shadow:var(--glass-lift), var(--glass-drop), 0 0 0 2px rgb(var(--ink-rgb) / 62%)}