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.btn-quiet:hover{background:var(--paper)}.status{font-weight:600;font-size:var(--step--1);text-align:center;justify-content:center;align-items:center;gap:8px;min-height:1.55em;display:flex}.status:before{content:"";border-radius:var(--r-sticker);background:currentColor;flex:none;width:8px;height:8px}@media(min-width:52rem){.status{text-align:left;justify-content:flex-start}.tool-side .status{font-size:var(--step-1);font-weight:750;font-stretch:110%;line-height:1.2}.tool-side .status:before{display:none}}.status[data-tone=error]{color:var(--error)}.status[data-tone=ok]{color:var(--ok)}.status[data-tone=info]{color:var(--ink-soft)}.solve-row{gap:var(--s1);display:flex}.btn-act.solve{min-height:58px;font-size:var(--step-1);border-radius:16px;flex:1;font-stretch:125%}.notice{padding:var(--s1) var(--s2);border-left:4px solid var(--now);background:var(--paper-raised);margin-bottom:var(--s2)}.solution{margin-top:var(--s6);scroll-margin-top:var(--s2)}.solution-head{justify-content:space-between;align-items:flex-end;gap:var(--s2);flex-wrap:wrap;display:flex}.solution-head h2{font-size:var(--step-0);font-stretch:var(--wdth-body);color:var(--ink-soft);letter-spacing:0;font-weight:700}.solution-head .count{color:var(--ink-soft);font-size:var(--step-1);font-weight:600}.solution-head .count strong{color:var(--ink);letter-spacing:-.045em;font-variant-numeric:tabular-nums;margin-right:.3em;font-size:clamp(3.2rem,2.4rem + 3vw,4.6rem);font-weight:800;font-stretch:125%;line-height:.95}.seg{background:var(--paper-raised);border-radius:24px;padding:2px;display:inline-flex}.seg button{min-height:40px;color:var(--ink-soft);font:inherit;font-size:var(--step--1);cursor:pointer;background:0 0;border:0;border-radius:20px;padding:0 .9rem;font-weight:700}.seg button[aria-checked=true]{background:var(--ink);color:var(--paper)}.follow{gap:var(--s2);margin-top:var(--s2);padding:var(--s3) var(--s2) var(--s2);background:var(--paper-raised);border-radius:24px;justify-items:center;display:grid}.pbar{align-items:center;width:100%;height:16px;display:flex}.pbar li{background:var(--rule);border-radius:3px;flex:1;height:8px}.pbar li[data-state]{background:var(--tile)}.pbar li[data-state][data-face=U]{box-shadow:inset 0 0 0 1px var(--rule)}.pbar li[data-state=now]{outline:2px solid var(--ink);outline-offset:1px;height:16px}.follow-row{align-items:center;gap:var(--s3);grid-template-columns:56px auto 56px;display:grid}.follow-side{place-items:center;display:grid}.follow-mini{color:#fff;width:56px;height:56px;font-size:var(--step-2);font-weight:800;font-stretch:var(--wdth-display);place-items:center;display:grid}.follow-side:first-child .follow-mini{opacity:.45}.follow-now{aspect-ratio:1;color:#fff;letter-spacing:-.05em;width:clamp(132px,38vw,170px);box-shadow:0 22px 34px -22px var(--floor);place-items:center;font-size:clamp(4rem,3rem + 5vw,5.6rem);font-weight:800;font-stretch:125%;line-height:1;display:grid}.follow-mini[data-light],.follow-now[data-light]{color:#1b1f2a}.follow-mini[data-face=U],.follow-now[data-face=U]{box-shadow:inset 0 0 0 1.5px var(--rule)}.follow-end{border-radius:var(--r-sticker);background:var(--ok-fill);box-shadow:none}.follow-say{text-align:center;justify-items:center;gap:2px;display:grid}.follow-say strong{font-size:var(--step-1)}.follow-say span{color:var(--ink-soft);font-size:var(--step--1);font-variant-numeric:tabular-nums}.follow-nav{gap:var(--s1);grid-template-columns:1fr 2fr;width:100%;display:grid}.follow-nav .btn{min-height:56px;font-size:var(--step-0);border:0;border-radius:16px;font-weight:700}.follow-back{background:var(--paper-sunk)}.follow-next{background:var(--ink);color:var(--paper);font-stretch:var(--wdth-display)}.follow-next:hover{background:var(--ink);opacity:.9}.follow-full{font-size:var(--step--1);color:var(--ink-soft);margin-top:-6px}.follow-full-view{z-index:100;gap:var(--s2);padding:max(var(--s1),env(safe-area-inset-top)) var(--gutter) max(var(--s3),env(safe-area-inset-bottom));background:var(--paper);overscroll-behavior:contain;grid-template-rows:auto auto auto minmax(0,1fr) auto auto;display:grid;position:fixed;inset:0}.ffv-top{justify-content:space-between;align-items:center;display:flex}.ffv-close{width:var(--touch);margin-left:-10px;padding:0}.ffv-count{font-variant-numeric:tabular-nums;font-weight:700}.ffv-hold{text-align:center;color:var(--ink-soft);font-size:var(--step--1)}.ffv-stage{align-content:center;justify-items:center;gap:var(--s3);cursor:pointer;-webkit-user-select:none;user-select:none;touch-action:manipulation;display:grid}.ffv-now{width:min(62vw,42vh,320px);font-size:min(33vw,22vh,170px)}.ffv-row{grid-template-columns:56px 1fr 56px;width:min(100%,22rem)}.ffv-hint{text-align:center;color:var(--ink-faint);font-size:var(--step--1)}.follow-full-view .follow-nav{justify-self:center;width:min(100%,32rem)}.follow-full-view .follow-nav .btn{border-radius:18px;min-height:64px}.follow-full-view .follow-back{background:var(--paper-raised)}.ffv-next{background:var(--act);color:var(--act-ink)}.ffv-next:hover{background:var(--act)}@media(min-width:52rem){.follow{place-items:center start;column-gap:var(--s6);padding:var(--s3) var(--s4);grid-template-columns:auto minmax(0,1fr);grid-template-areas:"row bar""row say""row nav""row full"}.pbar{grid-area:bar}.follow-row{grid-area:row}.follow-say{text-align:left;grid-area:say;justify-items:start}.follow-nav{grid-area:nav;max-width:26rem}.follow>.follow-full{grid-area:full;margin:-8px 0 0 -12px}}.hold{margin-top:var(--s1);font-weight:600}.solution-body{gap:var(--s3);margin-top:var(--s2);display:grid}@media(min-width:52rem){.solution-body{grid-template-columns:300px minmax(0,1fr);align-items:start}.solution-viewer{top:var(--s2);position:sticky}}.solution-viewer{justify-items:center;gap:var(--s1);display:grid}.solution-cube{max-width:280px}.controls{flex-wrap:wrap;justify-content:center;align-items:center;gap:4px;display:flex}.controls .btn-quiet{padding:0 .6rem}.controls .play{min-width:7.5rem}.speed{font-size:var(--step--1);color:var(--ink-soft);align-items:center;gap:6px;display:inline-flex}.speed select{min-height:var(--touch);border:1.5px solid var(--rule);border-radius:var(--r-control);background:var(--paper-raised);color:var(--ink);font:inherit;padding:0 .4rem}.progress,.count{color:var(--ink-soft);font-size:var(--step--1);font-variant-numeric:tabular-nums}.stage{padding:var(--s2) 0;border-top:1px solid var(--rule)}.stage h3{align-items:center;gap:var(--s1);display:flex}.stage-n{border-radius:var(--r-sticker);background:var(--paper-sunk);width:1.6em;height:1.6em;font-size:var(--step--1);font-variant-numeric:tabular-nums;place-items:center;display:inline-grid}.stage[data-active] .stage-n{background:var(--now);color:var(--now-ink)}.explain{color:var(--ink-soft);margin:4px 0 var(--s1);max-width:var(--measure)}.strip{margin-top:var(--s1);flex-wrap:wrap;gap:6px;display:flex}.move-tile{color:#fff;min-width:44px;height:44px;font:inherit;font-weight:750;font-stretch:var(--wdth-display);font-size:var(--step-0);cursor:pointer;transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease);border:0;padding:0 6px;box-shadow:inset 0 0 0 1px #0003}.move-tile[data-light]{color:#1b1f2a}.move-tile[data-done]{opacity:.45}.move-tile[aria-current=step]{box-shadow:inset 0 0 0 1px #0003,0 5px 0 -1px var(--now);transform:scale(1.08)}.actions{gap:var(--s1);margin-top:var(--s3);flex-wrap:wrap;display:flex}a.btn{text-decoration:none}.simulator{--stage-max:36rem;gap:var(--s3);grid-template-columns:minmax(0,1fr);display:grid}.sim-stage{width:100%;max-width:var(--stage-max);aspect-ratio:1;justify-self:center;position:relative}.sim-stage>.pz-view{width:100%;height:100%;position:absolute;inset:0}.sim-panel{gap:var(--s2);width:100%;max-width:var(--stage-max);flex-direction:column;justify-self:center;min-width:0;display:flex}.sim-panel>.notice{order:-2}.sim-panel>.sim-bar{order:-1}@media(min-width:60rem){.simulator{--stage-h:43rem;column-gap:var(--s6);grid-template-columns:minmax(0,1fr) 21rem}.sim-stage{aspect-ratio:auto;max-width:none;height:var(--stage-h)}.sim-panel{max-width:none;min-height:var(--stage-h);padding-top:var(--s1)}.sim-panel>.sim-bar{order:0}.sim-readout{flex:1 0 auto}.sim-history{flex:1 0 92px;height:auto}}.sim-readout{flex-direction:column;gap:6px;display:flex;position:relative}.sim-stats{gap:var(--s4);font-variant-numeric:tabular-nums;display:flex}.sim-stats dt{font-size:var(--step--1);color:var(--ink-soft);font-weight:600}.sim-stats dd{font-size:var(--step-4);letter-spacing:-.03em;font-weight:800;font-stretch:125%;line-height:1.05}.sim-history{border-radius:var(--r-panel);background:var(--paper);scrollbar-width:none;flex-wrap:wrap;align-content:flex-start;gap:12px 5px;height:92px;margin:0;padding:10px 10px 14px;list-style:none;display:flex;overflow:hidden auto}.sim-history::-webkit-scrollbar{display:none}.sim-history .move-chip{min-width:32px;height:32px;font-size:var(--step--1);position:relative}.sim-history .move-chip[data-now]:after{content:"";background:var(--now);border-radius:2px;height:3px;position:absolute;bottom:-7px;left:3px;right:3px}.sim-history-empty{color:var(--ink-faint);font-size:var(--step--1)}.sim-done{max-width:55%;font-size:var(--step--1);text-align:end;color:var(--ok);margin:0;font-weight:700;line-height:1.35;position:absolute;top:0;right:0}.sim-bar{gap:var(--s1);grid-template-columns:minmax(0,1fr) 58px 58px;display:grid}.sim-bar .btn-act{min-height:58px;font-size:var(--step-1);border-radius:16px;font-stretch:125%}.btn-icon{background:var(--paper-raised);min-height:58px;color:var(--ink);border:0;border-radius:16px;padding:0}.simulator .btn-icon,.simulator .solve-this,.simulator .move-pad-btn{background:var(--paper);border:0}.simulator .btn-icon:hover,.simulator .solve-this:hover,.simulator .move-pad-btn:hover{background:var(--paper-sunk)}.btn-icon:disabled{color:var(--ink-faint)}.move-pad{grid-template-columns:repeat(6,minmax(0,1fr));gap:6px;display:grid}.move-pad-btn{min-width:0;min-height:var(--touch);font-weight:700;font-stretch:var(--wdth-display);font-variant-numeric:normal;justify-content:center;align-items:center;gap:5px;padding:0 2px;display:inline-flex}.pad-dot{flex:none;width:10px;height:10px}.pad-dot[data-face=U]{box-shadow:inset 0 0 0 1.5px var(--rule)}.sim-options{align-items:center;gap:var(--s1) var(--s2);flex-wrap:wrap;margin-inline:-.5rem;display:flex}.toggle{min-height:var(--touch);cursor:pointer;align-items:center;gap:8px;padding:0 .5rem;font-weight:600;display:inline-flex}.toggle input{width:20px;height:20px;accent-color:var(--ink)}.sim-exit{gap:var(--s1);display:grid}.sim-exit .solve-this{width:100%}.sim-exit .hint{text-align:start;max-width:none;margin:0}.move-demo{padding:var(--s2);background:var(--paper-raised);border-radius:16px;grid-template-columns:minmax(0,1fr);justify-items:center;gap:4px;display:grid}.move-demo[data-lazy]{gap:var(--s1);padding:12px 12px 10px;position:relative}.move-demo[data-lazy] .btn-play{position:absolute;top:6px;right:6px}.demo-grid:has(>astro-island>.move-demo[data-lazy]){gap:var(--s1);grid-template-columns:repeat(auto-fill,minmax(8rem,1fr))}.move-demo[data-lazy] figcaption{flex-wrap:nowrap;justify-content:flex-start;gap:10px;width:100%}.move-chip{color:#1b1f2a;min-width:36px;height:36px;font-weight:800;font-stretch:var(--wdth-display);flex:none;place-items:center;padding:0 4px;display:grid}.move-chip[data-face=U]{box-shadow:inset 0 0 0 1.5px var(--rule)}.move-chip[data-face=R],.move-chip[data-face=B]{color:#fff}.move-demo-title{min-width:0;font-size:var(--step--1);color:var(--ink-soft);flex:1;line-height:1.25}.btn-play{width:var(--touch);height:var(--touch);background:var(--paper);color:var(--ink);cursor:pointer;border:0;border-radius:999px;flex:none;place-items:center;margin-left:auto;display:grid}.btn-play:hover{background:var(--ink);color:var(--paper)}.btn-play:disabled{opacity:.5}.move-demo figcaption{align-items:center;gap:var(--s1);flex-wrap:wrap;justify-content:center;display:flex}code.alg,.alg-text{font-family:var(--font);font-weight:700;font-stretch:var(--wdth-display);letter-spacing:.02em;font-size:var(--step-1)}.timer-tool{gap:var(--s3);margin-top:var(--s3);display:grid}.timer-top{gap:var(--s2);flex-wrap:wrap;align-items:center;display:flex}.scramble-box{gap:var(--s1);padding:var(--s3);background:var(--paper-raised);border-radius:24px;justify-items:start;display:grid}.scramble-box>.btn-quiet{margin-left:-1.1rem}@media(min-width:52rem){.scramble-box{column-gap:var(--s6);grid-template-columns:minmax(0,1fr) auto;align-items:center}.scramble-box>:not(.net){grid-column:1}.scramble-box>.net{grid-area:1/2/span 3}}.scramble-box .label{color:var(--ink-soft);font-weight:600}.scramble-text{font-size:var(--step-2);word-spacing:.25em;min-height:1.5em}.timer-pad{place-items:center;gap:var(--s1);min-height:14rem;padding:var(--s3);background:var(--paper-raised);touch-action:none;-webkit-user-select:none;user-select:none;cursor:pointer;border-radius:24px;display:grid}.timer-digits{font-size:clamp(3.5rem,2rem + 8vw,7rem);font-weight:800;font-stretch:var(--wdth-display);font-variant-numeric:tabular-nums;line-height:1}.timer-tool[data-phase=holding] .timer-digits{color:var(--error)}.timer-tool[data-phase=ready] .timer-digits{color:var(--ok)}.timer-tool[data-phase=inspect] .timer-digits{color:var(--ink-soft)}.stat-tiles{gap:var(--s2);margin:var(--s2) 0;grid-template-columns:repeat(auto-fit,minmax(7rem,1fr));display:grid}.stat-tiles div{padding:var(--s2);border-radius:var(--r-panel);background:var(--paper-raised)}.stat-tiles dt{color:var(--ink-soft);font-size:var(--step--1)}.stat-tiles dd{font-size:var(--step-2);font-weight:750;font-stretch:var(--wdth-display);font-variant-numeric:tabular-nums}.timer-chart svg{width:100%;height:140px;display:block}.timer-chart .line{fill:none;stroke:var(--link);stroke-width:2px;vector-effect:non-scaling-stroke}.timer-chart .best{stroke:var(--ok);stroke-dasharray:4 4;vector-effect:non-scaling-stroke}.timer-chart .dot{fill:var(--link)}.timer-chart figcaption,.hint.left{text-align:left;max-width:none;margin:0}.solve-list{margin-top:var(--s1);gap:4px;display:grid}.solve-list li{gap:var(--s1);border-bottom:1px solid var(--rule);font-variant-numeric:tabular-nums;grid-template-columns:2.5rem 5.5rem minmax(0,1fr);align-items:center;padding:6px 0;display:grid}.solve-list .n{color:var(--ink-faint)}.solve-list .time{font-weight:750}.solve-list .scr{text-overflow:ellipsis;white-space:nowrap;color:var(--ink-soft);font-size:var(--step--1);overflow:hidden}.solve-list .pen{flex-wrap:wrap;grid-column:1/-1;gap:4px;display:flex}.solve-list .pen button{border:1.5px solid var(--rule);border-radius:var(--r-control);background:var(--paper-raised);min-width:44px;min-height:36px;color:var(--ink);font:inherit;font-size:var(--step--1);cursor:pointer}.solve-list .pen button[aria-pressed=true]{background:var(--ink);color:var(--paper);border-color:var(--ink)}.solve-list .pen input{border:1.5px solid var(--rule);border-radius:var(--r-control);background:var(--paper-raised);min-width:8rem;min-height:36px;color:var(--ink);font:inherit;font-size:var(--step--1);flex:1;padding:0 .5rem}@media(min-width:52rem){.timer-layout{gap:var(--s4);grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);display:grid}}.net[data-n="4"]{--cell:clamp(11px, 3.3vw, 18px)}.net[data-n="4"] .net-face{--n:4;gap:1px}.solution-head .method{color:var(--ink-faint);margin:0;font-weight:600}.color-settings{display:contents}.color-panel{gap:var(--s1);padding:var(--s2);background:var(--paper-raised);border:1px solid var(--rule);border-radius:var(--r-panel);text-align:start;flex-basis:100%;justify-items:start;margin:0;display:grid}.color-panel legend{padding-inline:4px;font-weight:700}.color-grid{gap:var(--s1);grid-template-columns:repeat(auto-fill,minmax(8.5rem,1fr));width:100%;display:grid}.color-row{align-items:center;gap:var(--s1);cursor:pointer;min-height:44px;display:flex}.color-row input[type=color]{border:1.5px solid var(--rule);border-radius:var(--r-control);background:var(--paper);cursor:pointer;block-size:44px;inline-size:44px;padding:2px}.color-panel .hint{text-align:start;margin:0}.move-chip:not([data-face]){background:var(--ink);color:var(--paper)}.nchart{gap:var(--s3);padding:var(--s2);background:var(--paper-raised);border-radius:24px;display:grid}@media(min-width:52rem){.nchart{gap:var(--s6);padding:var(--s3) var(--s4);border-radius:28px;grid-template-columns:minmax(0,22rem) minmax(0,1fr);align-items:center}}.nchart-cube{justify-items:center;gap:var(--s2);display:grid}.nchart-view{width:min(300px,56vw)}.nchart-now{align-items:center;gap:12px;width:100%;max-width:22rem;display:flex}.nchart-now .move-chip{min-width:48px;height:48px;font-size:var(--step-1)}.nchart-now p{flex:1;font-weight:650;line-height:1.3}.nchart-hint{color:var(--ink-soft);font-size:var(--step--1);margin-bottom:var(--s1)}.nchart-table{table-layout:fixed;border-collapse:separate;border-spacing:0 6px;width:100%}.nchart-table th{text-align:left;font-size:var(--step--1);color:var(--ink-soft);padding:0 8px 0 0;font-weight:600}.nchart-table tbody th{color:var(--ink);font-weight:700;font-size:var(--step-0)}.nchart-table td{padding:0 4px}.nchart-move{width:100%;min-height:52px;box-shadow:inset 0 0 0 1px var(--rule);cursor:pointer;background:0 0;border:0;border-radius:12px;justify-content:center;align-items:center;padding:0 8px;display:flex}.nchart-move:hover{background:var(--paper)}.nchart-move[aria-pressed=true]{background:var(--paper);box-shadow:inset 0 0 0 2.5px var(--ink)}.nchart-move .move-chip{min-width:40px;height:40px}.face-net{grid-template-columns:repeat(4,minmax(0,1fr));gap:6px;width:min(100%,18rem);display:grid}.face-net span{aspect-ratio:1;font-size:var(--step-2);font-weight:800;font-stretch:var(--wdth-display);color:#1b1f2a;place-items:center;display:grid}.face-net .sticker[data-face=U]{box-shadow:inset 0 0 0 1.5px var(--rule)}.face-net .sticker[data-face=R],.face-net .sticker[data-face=B]{color:#fff}.face-net .gap{visibility:hidden}.faces-row{gap:var(--s3);align-items:center;display:grid}@media(min-width:52rem){.faces-row{gap:var(--s6);grid-template-columns:18rem minmax(0,1fr)}}.nchart-table thead th:first-child{width:6.5rem}.page-top{padding-top:var(--s4)}.crumbs+.page-top{padding-top:var(--s1)}.page-top>h1+*{margin-top:var(--s2)}.page-top>h1{text-align:center}.page-top>h1+.subtitle{text-align:center;margin-inline:auto}.section{margin-top:var(--s8)}.tool-h1{flex-direction:column;gap:6px;display:flex}.h1-main{letter-spacing:-.04em;font-size:clamp(1.85rem,1.1rem + 3.4vw,3.5rem);font-weight:800;font-stretch:122%;line-height:.98}.h1-sub{font-size:var(--step-0);font-weight:600;line-height:1.3;font-stretch:var(--wdth-body);letter-spacing:0;color:var(--ink-soft)}@media(min-width:52rem){.h1-sub{font-size:var(--step-1)}}.tool-hero{gap:var(--s2);padding-bottom:var(--s6);border-image:linear-gradient(to bottom,var(--paper) 10%,var(--stage)) fill 0 / / 0 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