.rk-hero{padding-bottom:6px}.rk-stepper{display:flex;gap:10px;list-style:none;padding:0;margin:18px 0 0;flex-wrap:wrap;counter-reset:none}.rk-stepper li a{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--muted);font-family:var(--mono);font-size:.85rem;padding:8px 14px 8px 8px;border-radius:999px;border:1px solid rgba(191,168,214,.25);background:#08020e80}.rk-stepper b{display:grid;place-items:center;width:28px;height:28px;border-radius:50%;background:#ffffff14;color:var(--text);font-size:.85rem}.rk-stepper li.active a{color:#fff;border-color:var(--pink);box-shadow:0 0 18px #ff2bd64d}.rk-stepper li.active b{background:var(--pink)}.rk-stepper li.active.bad a{border-color:var(--red)}.rk-stepper li.active.bad b{background:var(--red)}.rk-stepper li.done a{color:var(--green);border-color:#39ff8873}.rk-stepper li.done b{background:var(--green);color:#04210f}.rk-stepper li.done b:after{content:""}.rk-sec{padding:14px 0 26px}.rk-sec h2{display:flex;align-items:center;gap:12px;font-size:clamp(1.25rem,2.6vw,1.7rem);margin-bottom:10px}.rk-num{display:inline-grid;place-items:center;width:1.6em;height:1.6em;border-radius:12px;background:linear-gradient(135deg,var(--pink),var(--purple));font-size:.8em;color:#fff;box-shadow:0 0 18px #ff2bd659}.rk-intro{margin:0 0 14px;max-width:820px}.rk-edit-grid{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);gap:18px;align-items:start}.rk-side{display:flex;flex-direction:column;gap:14px;min-width:0}.rk-side .card{padding:16px 18px}.rk-net-card{padding:16px;overflow:hidden}.rk-net{--st:clamp(20px,3.5vw,40px);display:grid;grid-template-columns:repeat(4,max-content);grid-template-rows:repeat(3,max-content);gap:6px;justify-content:center}.rk-face{display:flex;flex-direction:column;gap:3px;min-width:0}.rk-flabel{font-family:var(--mono);font-size:.62rem;color:var(--muted);line-height:1.15;max-width:calc(var(--st)*3 + 8px);min-height:2.3em}.rk-flabel b{color:var(--yellow)}.rk-fgrid{display:grid;grid-template-columns:repeat(3,var(--st));grid-template-rows:repeat(3,var(--st));gap:3px;padding:4px;border-radius:10px;background:#07020b;border:1px solid rgba(255,255,255,.08)}.rk-st{all:unset;box-sizing:border-box;cursor:pointer;border-radius:22%;background:var(--c);box-shadow:inset 0 -3px #00000040,inset 0 2px #ffffff40;transition:transform .08s}.rk-st:hover{transform:scale(1.08)}.rk-st:focus-visible{outline:3px solid var(--yellow);outline-offset:1px}.rk-st.blank{background:repeating-linear-gradient(45deg,#1d1027,#1d1027 4px,#2a1838 4px 8px);box-shadow:inset 0 0 0 1px #ffffff2e}.rk-st.center{position:relative}.rk-st.center:after{content:"";position:absolute;inset:34%;border-radius:50%;background:#00000040}.rk-st.bad{outline:3px solid var(--red);outline-offset:1px;animation:rkpulse 1s infinite alternate}@keyframes rkpulse{to{outline-color:#ff4d6d4d}}.rk-palette{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}.rk-sw{all:unset;box-sizing:border-box;cursor:pointer;width:46px;height:46px;border-radius:12px;background:var(--c,#1d1027);display:grid;place-items:center;font-family:var(--mono);font-weight:700;color:#0000008c;border:2px solid transparent}.rk-sw[data-c=X]{color:var(--muted);border:2px dashed rgba(255,255,255,.3)}.rk-sw[aria-checked=true]{border-color:#fff;box-shadow:0 0 0 3px var(--pink),0 0 18px var(--pink)}.rk-sw:focus-visible{outline:3px solid var(--yellow);outline-offset:2px}.rk-counts{display:flex;gap:6px;flex-wrap:wrap}.rk-keys{margin:10px 0 0;font-size:.78rem}.rk-dot,.rk-swatch:before{display:inline-block;width:10px;height:10px;border-radius:3px;background:var(--c)}.rk-swatch{display:inline-flex;align-items:center;gap:5px;font-weight:700;text-transform:uppercase;font-size:.85em;padding:0 7px;border-radius:7px;background:#ffffff12;white-space:nowrap}.rk-swatch:before{content:"";width:.9em;height:.9em}.rk-actions{display:flex;gap:8px;flex-wrap:wrap}.rk-more{margin-top:12px}.rk-more summary,.rk-learn summary,.rk-list-card summary{cursor:pointer;font-family:var(--mono);font-size:.82rem;color:var(--cyan);list-style:none}.rk-more summary::-webkit-details-marker,.rk-learn summary::-webkit-details-marker,.rk-list-card summary::-webkit-details-marker{display:none}.rk-more summary:before,.rk-learn summary:before,.rk-list-card summary:before{content:"\25b8  ";color:var(--pink)}.rk-more[open] summary:before,.rk-learn details[open] summary:before,.rk-list-card[open] summary:before{content:"\25be  "}.rk-row{display:flex;gap:8px;margin-top:10px}.rk-row input{min-width:0}.rk-check{display:flex;gap:18px;align-items:center;justify-content:space-between;flex-wrap:wrap}.rk-status{flex:1 1 360px;font-size:.95rem;min-height:2.6em}.rk-status.ok{color:var(--text)}.rk-status.ok b{color:var(--green)}.rk-status.bad b{color:var(--red)}.rk-check:has(.rk-status.ok){border-color:#39ff8880}.rk-check:has(.rk-status.bad){border-color:#ff4d6d8c}.rk-status ul{margin:8px 0 0;padding-left:18px}.rk-status li{margin:4px 0}.rk-check-act{display:flex;flex-direction:column;align-items:flex-end;gap:6px}.rk-solve{font-size:1.05rem;padding:15px 28px}.rk-orient{margin-bottom:12px;line-height:2;font-size:.95rem;padding:8px 14px;border-left:3px solid var(--yellow);background:#ffc3000f;border-radius:0 12px 12px 0}.rk-play-grid{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);gap:18px;align-items:stretch}.rk-stage{position:relative}.rk-cam{position:absolute;top:6px;left:50%;transform:translate(-50%);margin:0;padding:4px 10px;border-radius:999px;background:#07020bd1;border:1px solid rgba(255,195,0,.45);color:#ffd75e;font-size:.74rem;white-space:nowrap;pointer-events:none;max-width:96%;overflow:hidden;text-overflow:ellipsis}.rk-stage-card{padding:10px;display:flex;flex-direction:column}.rk-stage{--s:clamp(46px,10.5vw,74px);height:calc(var(--s)*6.2);display:grid;place-items:center;perspective:calc(var(--s)*16);cursor:pointer;touch-action:none;user-select:none;-webkit-user-select:none;-webkit-tap-highlight-color:transparent;outline:none}.rk-cube,.rk-layer{position:relative;width:0;height:0;transform-style:preserve-3d}.rk-layer{position:absolute;left:0;top:0}.rk-cubie{position:absolute;left:0;top:0;transform-style:preserve-3d;transform:translate3d(calc(var(--s)*var(--x)),calc(var(--s)*var(--y)),calc(var(--s)*var(--z)))}.rk-cf{position:absolute;width:var(--s);height:var(--s);left:calc(var(--s)/-2);top:calc(var(--s)/-2);background:#0a0a0f;border-radius:8%;backface-visibility:hidden;padding:6%;box-sizing:border-box}.rk-cf i{display:block;width:100%;height:100%;border-radius:16%;box-shadow:inset 0 0 0 1px #00000040,inset 0 3px 6px #ffffff2e;transition:filter .25s}.f-front,.ov-F{transform:translateZ(calc(var(--s)/2))}.f-back{transform:rotateY(180deg) translateZ(calc(var(--s)/2))}.f-right{transform:rotateY(90deg) translateZ(calc(var(--s)/2))}.f-left{transform:rotateY(-90deg) translateZ(calc(var(--s)/2))}.f-up{transform:rotateX(90deg) translateZ(calc(var(--s)/2))}.f-down{transform:rotateX(-90deg) translateZ(calc(var(--s)/2))}.rk-cube.focus .rk-cubie:not(.hl) .rk-cf i{filter:brightness(.62) saturate(.8)}.rk-cube.focus .rk-cubie.hl .rk-cf i{box-shadow:0 0 0 2px #fff,inset 0 3px 6px #ffffff2e}.rk-cube.pulse .rk-cubie.hl .rk-cf i{animation:rkhl .22s ease-in-out infinite alternate}@keyframes rkhl{0%{box-shadow:0 0 0 2px #fff}to{box-shadow:0 0 0 4px #ff2bd6,0 0 14px #ff2bd6}}.rk-ov{position:absolute;width:calc(var(--s)*3);height:calc(var(--s)*3);left:calc(var(--s)*-1.5);top:calc(var(--s)*-1.5);backface-visibility:hidden;pointer-events:none}.rk-ov svg{width:100%;height:100%;overflow:visible;display:block}.ov-F{transform:translateZ(calc(var(--s)*1.5 + 3px))}.ov-B{transform:rotateY(180deg) translateZ(calc(var(--s)*1.5 + 3px))}.ov-R{transform:rotateY(90deg) translateZ(calc(var(--s)*1.5 + 3px))}.ov-L{transform:rotateY(-90deg) translateZ(calc(var(--s)*1.5 + 3px))}.ov-U{transform:rotateX(90deg) translateZ(calc(var(--s)*1.5 + 3px))}.ov-D{transform:rotateX(-90deg) translateZ(calc(var(--s)*1.5 + 3px))}.rk-cube.turning .rk-ov{opacity:.75}.rk-flow{stroke-dasharray:22 12;animation:rkflow .6s linear infinite}@keyframes rkflow{to{stroke-dashoffset:-34}}.rk-ov-label{font-family:var(--display);font-size:64px;paint-order:stroke;stroke:#0d0414;stroke-width:10px}.rk-ov-label.small{font-size:44px}.rk-view-btns{display:flex;gap:8px;align-items:center;flex-wrap:wrap;justify-content:center;padding:6px 8px 4px}.rk-now{display:flex;flex-direction:column;gap:10px}.rk-now-top{display:grid;grid-template-columns:minmax(0,1fr) 128px;gap:14px;align-items:center}.rk-step-count{font-family:var(--mono);color:var(--muted);font-size:.8rem}.rk-big{font-family:var(--display);font-size:clamp(3.4rem,8vw,4.6rem);line-height:1.05;height:1.1em}.rk-big.cw{color:#39ff88;text-shadow:0 0 24px rgba(57,255,136,.45)}.rk-big.ccw{color:#ff4fd8;text-shadow:0 0 24px rgba(255,79,216,.45)}.rk-big.half,.rk-big.done{color:var(--yellow);text-shadow:0 0 24px rgba(255,195,0,.5)}.rk-dir{display:inline-block;font-family:var(--mono);font-weight:700;font-size:.78rem;padding:4px 10px;border-radius:999px;border:1px solid currentColor;white-space:nowrap}.rk-dir.cw{color:#39ff88}.rk-dir.ccw{color:#ff4fd8}.rk-dir.half,.rk-dir.done{color:var(--yellow)}.rk-face2d{width:128px;height:128px}.rk-explain{height:5.4em;overflow:hidden;line-height:1.8;margin:0;font-size:.98rem}.rk-progress{height:6px;border-radius:3px;background:#ffffff14;overflow:hidden;margin-top:auto}.rk-progress i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--pink),var(--yellow));transition:width .3s}.rk-controls{display:flex;gap:8px;align-items:center;justify-content:center;flex-wrap:wrap;margin-top:8px;padding:12px 8px 6px;border-top:1px solid var(--line)}.rk-cbtn{all:unset;box-sizing:border-box;cursor:pointer;min-width:52px;height:52px;padding:0 16px;border-radius:14px;display:inline-flex;align-items:center;justify-content:center;gap:4px;font-family:var(--mono);font-weight:700;font-size:1rem;color:var(--text);border:1px solid rgba(255,195,0,.5);background:#ffffff08;transition:transform .1s,box-shadow .2s}.rk-cbtn:hover{box-shadow:0 0 16px #ffc3004d}.rk-cbtn:active{transform:scale(.96)}.rk-cbtn.primary{background:linear-gradient(135deg,var(--pink),var(--purple));border-color:transparent;min-width:120px}.rk-cbtn:focus-visible{outline:3px solid var(--yellow);outline-offset:2px}.rk-cbtn[disabled]{opacity:.35;cursor:not-allowed;box-shadow:none}.rk-speed{display:flex;align-items:center;gap:6px;margin-left:8px}.rk-speed input{accent-color:var(--pink);width:110px}.rk-hint{text-align:center;margin:4px 0;font-size:.78rem}.rk-list-card{margin-top:16px}.rk-list-card{padding:14px 18px}.rk-list-card summary h3{display:inline;margin:0}.rk-list{display:flex;flex-wrap:wrap;gap:6px;list-style:none;padding:0;margin:12px 0;max-height:190px;overflow:auto}.rk-mv{all:unset;cursor:pointer;font-family:var(--mono);font-weight:700;padding:5px 10px;border-radius:8px;border:1px solid var(--line);min-width:2.2em;text-align:center}.rk-mv.cw{color:#39ff88}.rk-mv.ccw{color:#ff4fd8}.rk-mv.half{color:var(--yellow)}.rk-mv:focus-visible{outline:2px solid var(--yellow)}.rk-list li.done .rk-mv{opacity:.4}.rk-list li.current .rk-mv{background:var(--pink);border-color:var(--pink);color:#fff;box-shadow:0 0 14px var(--pink)}.rk-learn details{margin-bottom:12px;padding:14px 18px}.rk-learn summary h3{display:inline;margin:0}.rk-learn details[open] summary{margin-bottom:8px}.rk-learn li{margin:6px 0}.rk-table{border-collapse:collapse;width:100%;max-width:560px;font-size:.9rem;margin-bottom:10px}.rk-table td{padding:5px 8px;border-bottom:1px solid var(--line)}.rk-learn code{color:var(--green)}.cw{color:#39ff88!important}.ccw{color:#ff4fd8!important}.half{color:var(--yellow)!important}@media(max-width:900px){.rk-edit-grid,.rk-play-grid{grid-template-columns:minmax(0,1fr)}.rk-check-act{align-items:stretch;width:100%}}@media(max-width:560px){.rk-net{--st:calc((92vw - 92px)/12);gap:3px}.rk-fgrid{gap:2px;padding:2px}.rk-flabel span{display:none}.rk-flabel{min-height:auto}.rk-stepper{gap:6px}.rk-stepper li a{padding:5px 10px 5px 5px;font-size:.75rem;gap:6px}.rk-stepper b{width:22px;height:22px}.rk-controls{gap:6px;padding:10px 0 4px;flex-wrap:nowrap}#rkFirst,#rkLast{display:none}.rk-cbtn{min-width:48px;height:54px;padding:0 10px}#rkPrev span{display:none}.rk-cbtn.primary{min-width:64px;flex:1}.rk-speed{display:none}.rk-now-top{grid-template-columns:minmax(0,1fr) 104px}.rk-face2d{width:104px;height:104px}.rk-explain{height:7.2em;font-size:.92rem}.rk-hint{display:none}}