:root{color-scheme:light dark;--bg:#fbfbfd;--panel:#fff;--ink:#16161a;--soft:#65656f;--line:#e0e0e8;--accent:#2a78d6;--accent-ink:#fff;--radius:14px;--shadow:0 1px 2px #10101a0f, 0 8px 24px #10101a0f}@media (prefers-color-scheme:dark){:root{--bg:#0f0f14;--panel:#17171e;--ink:#ecedf3;--soft:#9a9aa8;--line:#2b2b36;--accent:#5a9bff;--accent-ink:#0b1020;--shadow:0 1px 2px #0006, 0 10px 30px #00000059}}*{box-sizing:border-box}body{background:var(--bg);color:var(--ink);justify-items:center;gap:1.25rem;margin:0;padding:clamp(1rem,2.5vw,2rem);font:15px/1.55 ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif;display:grid}main{gap:1.25rem;width:min(1180px,100%);display:grid}.page-head{width:min(1180px,100%)}.page-head h1{letter-spacing:-.01em;margin:0;font-size:clamp(1.3rem,2.4vw,1.75rem)}.page-head p{color:var(--soft);margin:.2rem 0 0}.views{grid-template-columns:1fr;align-items:start;gap:1.25rem;display:grid}@media (width>=780px){.views{grid-template-columns:1fr 1fr}}.view{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);gap:.6rem;margin:0;padding:.75rem;display:grid}.stage{place-items:center;height:clamp(250px,34vw,430px);display:grid}.stage svg{width:100%;height:100%;display:block}#view-3d{cursor:grab;touch-action:none}#view-3d.dragging{cursor:grabbing}#view-net [data-facelet]{cursor:pointer}figcaption{color:var(--soft);border-top:1px solid var(--line);flex-wrap:wrap;align-items:center;gap:.5rem .9rem;padding-top:.6rem;font-size:.85rem;display:flex}.hint{opacity:.8;margin-left:auto;font-style:italic}label{align-items:center;gap:.35rem;display:inline-flex}.check{user-select:none}input[type=text],input[type=number],select{font:inherit;color:inherit;background:var(--bg);border:1px solid var(--line);border-radius:8px;min-width:0;padding:.3rem .5rem}input[type=text]:focus-visible,select:focus-visible,button:focus-visible{outline:2px solid var(--accent);outline-offset:1px}input[type=range]{accent-color:var(--accent)}button{font:inherit;color:inherit;background:var(--panel);border:1px solid var(--line);cursor:pointer;border-radius:9px;padding:.35rem .75rem;transition:border-color .15s,background .15s,transform 50ms}button:hover:not(:disabled){border-color:var(--soft)}button:active:not(:disabled){transform:translateY(1px)}button:disabled{opacity:.45;cursor:not-allowed}button.primary{background:var(--accent);color:var(--accent-ink);border-color:#0000}button.ghost{color:var(--soft);border-color:#0000;padding:.25rem .4rem}@media (width<=560px){.perm-row{grid-template-columns:1fr}}.console{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);gap:.85rem;padding:1rem;display:grid}#sequence-form{gap:.5rem;display:flex}#sequence{flex:1;padding:.5rem .7rem;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.95rem}.status{color:var(--soft);min-height:1.4em;margin:0;font-size:.88rem}.status.error{color:#d1365a}.solution{gap:.4rem;margin:0;display:grid}.solution:empty{display:none}.transport{flex-wrap:wrap;align-items:center;gap:.45rem;display:flex}.transport .speed{color:var(--soft);margin-left:auto;font-size:.85rem}.chips{flex-wrap:wrap;gap:.3rem;margin:0;padding:0;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.85rem;list-style:none;display:flex}.chips:empty{display:none}.chips li{border:1px solid var(--line);color:var(--soft);cursor:pointer;border-radius:7px;padding:.1rem .45rem}.chips li.done{color:var(--ink);border-color:var(--soft)}.chips li.current{background:var(--accent);color:var(--accent-ink);border-color:#0000}.chips li.phase2{box-shadow:-3px 0 0 var(--accent);margin-left:.35rem}.actions{flex-wrap:wrap;align-items:center;gap:.45rem;display:flex}.actions .spacer{flex:1}.menu{position:relative}.menu summary{cursor:pointer;border:1px solid var(--line);border-radius:9px;padding:.35rem .75rem;list-style:none}.menu summary::-webkit-details-marker{display:none}.menu[open] summary{border-color:var(--soft)}.menu-body{z-index:5;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);min-width:15rem;box-shadow:var(--shadow);gap:.35rem;margin-top:.4rem;padding:.6rem;display:grid;position:absolute;right:0}.menu-body button{text-align:left}.menu-body label{color:var(--soft);font-size:.85rem}.notation summary{cursor:pointer;color:var(--soft);font-size:.88rem}.notation table{border-collapse:collapse;margin-top:.5rem;font-size:.85rem}.notation td{vertical-align:top;padding:.18rem .7rem .18rem 0}.notation td:first-child{white-space:nowrap}.notation code{background:var(--bg);border:1px solid var(--line);border-radius:5px;padding:0 .3rem;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}body.embed{gap:.5rem;padding:.5rem}body.embed .page-head,body.embed .console,body.embed .about,body.embed figcaption{display:none}body.embed .view{box-shadow:none}body.embed.with-controls .console{display:grid}.perm{grid-column:1/-1;gap:.5rem}.perm-head{border-top:none;border-bottom:1px solid var(--line);padding:0 0 .5rem}.perm-head .hint{font-style:italic}.perm dl{gap:.5rem;margin:0;display:grid}.perm-row{grid-template-columns:5.5rem 1fr;align-items:baseline;gap:.2rem .75rem;display:grid}.perm-row dt{color:var(--soft);white-space:nowrap;font-size:.85rem}.perm-row dd{min-width:0;margin:0}.perm-row code{overflow-wrap:anywhere;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.85rem;line-height:1.7}.perm-row .cycle{white-space:nowrap;color:var(--soft);margin-right:.4rem;display:inline-block}.facelet{text-align:center;font-variant-numeric:tabular-nums;border:1px solid #10101473;border-radius:.32em;min-width:1.9em;margin:.12em .05em;padding:.05em .25em;font-size:.78rem;line-height:1.35;display:inline-block}#perm-body .facelet{cursor:pointer}#perm-body .facelet:hover{outline:2px solid var(--accent);outline-offset:1px}.perm-stat{color:var(--soft);font-size:.8rem;display:block}.perm-note{color:var(--soft);margin:0;font-size:.85rem}@media (width<=560px){.perm-row{grid-template-columns:1fr}}.console{display:grid}body.embed.with-controls figcaption{display:flex}body.hide-net .views,body.hide-3d .views{grid-template-columns:1fr}body.hide-net #fig-net,body.hide-3d #fig-3d,body.hide-perm #fig-perm{display:none}@media (width>=780px){.pin{display:none}}@media (width<=779px){.view.pinned{z-index:5;border-color:var(--accent);order:-1;max-height:72vh;position:sticky;top:.5rem;overflow:auto}}.form-hint{color:var(--soft);margin:.4rem 0 0;font-size:.85rem}.about{border-top:1px solid var(--line);width:min(1180px,100%);color:var(--soft);padding-top:1.25rem}.about h2,.about p{max-width:68ch}.about h2{color:var(--ink);letter-spacing:-.01em;margin:1.5rem 0 .4rem;font-size:1rem;font-weight:600}.about h2:first-of-type{margin-top:0}.about p{margin:0 0 .6rem}.about a{color:var(--accent)}.about code{color:var(--ink);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.9em}.about .colophon{border-top:1px solid var(--line);margin-top:1.25rem;padding-top:.75rem;font-size:.9rem}.noscript{border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);width:min(1180px,100%);color:var(--soft);margin:0;padding:.75rem 1rem}