:root{color-scheme:dark;--bg:#101214;--panel:#181b1e;--line:#303338;--muted:#909599;--text:#f0f1ee;--lime:#ccf88a;--unit:60px}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font-family:Arial,Helvetica,sans-serif;font-size:14px}
button,a{-webkit-tap-highlight-color:transparent}
button{font:inherit;cursor:pointer;color:inherit}
button:disabled{opacity:.35;cursor:not-allowed}
button:focus-visible,a:focus-visible,#viewport:focus-visible{outline:2px solid var(--lime);outline-offset:5px}
button{transition:background .18s,opacity .18s,transform .18s}
button:not(:disabled):active{transform:translateY(1px)}
.header{max-width:1400px;margin:auto;padding:30px 5%;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #24272a}
.brand{text-decoration:none;color:var(--text);font-size:29px;font-weight:800;letter-spacing:-1.6px;display:flex;align-items:center;gap:10px}
.brand-mark{color:var(--lime);font-size:33px;line-height:1}
.brand-dot{color:var(--lime);margin-left:-10px}
.header-note,.edition,.eyebrow,.stage-label,.metric-label,.stage-caption,.history h3,.history-total,footer{font-size:10px;letter-spacing:1.7px}
.header-note{color:#757c80}
.edition{border:1px solid var(--line);padding:10px 12px;border-radius:6px;letter-spacing:1px}
.edition span{color:var(--muted);margin-left:12px;font-size:9px}
main{max-width:1200px;margin:auto;padding:48px 32px 0}
.intro{position:relative;margin-bottom:32px}
.eyebrow{color:var(--muted);font-weight:600}
.intro .eyebrow{display:flex;align-items:center;gap:8px}
.eyebrow>span{width:5px;height:5px;border-radius:50%;background:var(--lime)}
h1{font-size:56px;line-height:1.06;letter-spacing:-2.8px;font-weight:500;margin:18px 0}
h1 br{display:none}
h1 em{font-style:normal;color:var(--lime)}
.intro p{position:absolute;right:0;bottom:0;color:var(--muted);line-height:1.7;font-size:13px;margin:0}
.workspace{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(320px,1fr);gap:24px}
.playground{background:radial-gradient(ellipse at 50% 40%,#272c2e 0%,#1b1e21 55%,#181b1e 100%);border:1px solid var(--line);border-radius:18px;overflow:hidden;position:relative;display:flex;flex-direction:column;min-height:545px}
.stage-top{display:flex;justify-content:space-between;align-items:center;padding:25px;z-index:1}
.status{font-size:11px;color:var(--lime);border:1px solid #47533b;background:#293126;padding:7px 11px;border-radius:20px}
.status.mixed{color:#f4cc81;background:#332e23;border-color:#55462f}
.stage-label{color:#777f83;font-size:9px}
.viewport{flex:1;min-height:320px;position:relative;perspective:1000px;touch-action:none;cursor:grab;overflow:hidden}
.viewport:active{cursor:grabbing}
.camera{position:absolute;left:50%;top:46%;width:0;height:0;transform-style:preserve-3d;transform:rotateX(-25deg) rotateY(-35deg)}
.cube,.layer{position:absolute;width:0;height:0;transform-style:preserve-3d}
.cubie{position:absolute;width:var(--unit);height:var(--unit);left:calc(var(--unit) / -2);top:calc(var(--unit) / -2);transform-style:preserve-3d}
.sticker{position:absolute;inset:0;border:3px solid #0b0c0e;border-radius:7px;background:#0d0f11;backface-visibility:hidden;display:grid;place-items:center;box-shadow:inset 0 0 0 1px #ffffff17}
.sticker.colored:after{content:'';position:absolute;inset:1px;border-radius:4px;background:linear-gradient(140deg,#ffffff16,transparent 65%);pointer-events:none}
.face-letter{color:#0007;font-size:17px;font-weight:800}
.cube-shadow{position:absolute;top:82%;left:50%;width:230px;height:28px;background:#0009;filter:blur(15px);border-radius:50%;transform:translateX(-50%)}
.view-hint{text-align:center;font-size:11px;color:#838b90;padding:12px 0 25px}
.view-hint>span:first-child{font-size:17px;margin-right:6px}
.hint-dot{margin:0 10px}
.view-hint button{background:none;border:0;padding:4px;color:#aeb3b7;font-size:11px}
.stage-bottom{border-top:1px solid #ffffff09;display:flex;align-items:center;justify-content:space-between;padding:20px 25px}
.metric-label{color:var(--muted);font-size:8px;display:block}
.stage-bottom strong{display:block;font-size:27px;font-weight:400;margin-top:5px;font-variant-numeric:tabular-nums}
.color-key{display:flex;gap:5px}
.color-key i{width:7px;height:7px;border-radius:2px;background:#f2f0e5}
.color-key i:nth-child(2){background:#f5ce4c}
.color-key i:nth-child(3){background:#60cb8b}
.color-key i:nth-child(4){background:#5a99ee}
.color-key i:nth-child(5){background:#ee6560}
.color-key i:nth-child(6){background:#f5a151}
.stage-caption{color:#626b70;font-size:8px}
.controls{border:1px solid var(--line);border-radius:18px;padding:27px;background:#17191b}
.panel-heading{display:flex;justify-content:space-between;align-items:center}
.panel-heading .eyebrow{font-size:9px;letter-spacing:1.5px}
h2{font-size:25px;letter-spacing:-.8px;font-weight:500;margin:10px 0 25px}
.control-icon{font-size:26px;color:#6d7479;margin-top:-20px}
.action-row{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.button{border-radius:8px;padding:15px 10px;font-weight:600;display:flex;justify-content:center;gap:10px;border:1px solid transparent}
.primary{background:var(--lime);color:#1c2813}
.primary:hover:not(:disabled){background:#ddffac}
.solve{background:#252a25;border-color:#414c37;color:var(--lime)}
.solve:hover:not(:disabled){background:#35402e}
.solver-note{text-align:center;font-size:10px;color:#7d8589;margin:12px 0 0}
.divider{height:1px;background:var(--line);margin:23px 0 20px}
.section-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}
h3{font-size:12px;font-weight:500;margin:0}
.section-heading>span{font-size:12px;color:#778086}
.face-controls{display:grid;grid-template-columns:1fr 1fr;gap:9px}
.face-row{display:flex;align-items:center;background:#202326;border:1px solid #303538;border-radius:7px;padding:5px 5px 5px 10px;gap:5px}
.face-dot{width:5px;height:5px;border-radius:50%;flex-shrink:0}
.face-name{font-size:10px;color:#a1a9ae;flex:1}
.face-row button{padding:7px 5px;min-width:30px;min-height:35px;border:1px solid #394046;background:#292e32;border-radius:4px;font-size:12px}
.face-row button:hover:not(:disabled){background:#424b51}
.utility-row{display:flex;gap:10px;margin-top:16px}
.utility-row button{flex:1;background:transparent;border:1px solid #343a3e;border-radius:7px;padding:11px 5px;color:#b1b8bc;font-size:11px}
.utility-row button:hover:not(:disabled){background:#292e32}
.keyboard-note{display:flex;align-items:center;gap:12px;margin-top:22px;color:#7e888d}
.keyboard-icon{font-size:22px}
.keyboard-note p{font-size:10px;line-height:1.9;margin:0}
.keyboard-note b{color:#b9bfc3;font-weight:400;letter-spacing:2px}
kbd{font:inherit;border:1px solid #41474b;border-radius:3px;padding:1px 3px;color:#b1b8bc}
.history{display:flex;align-items:center;gap:22px;border:1px solid var(--line);border-radius:12px;margin-top:20px;padding:20px 24px;min-height:75px}
.history-label{display:flex;gap:10px;align-items:center;white-space:nowrap;color:#939ca1}
.history h3{font-size:9px}
.history-label>span{font-size:22px;color:#6c767c}
.recent-moves{display:flex;gap:6px;flex:1;overflow:hidden;align-items:center}
.empty-history{font-size:12px;color:#626c72}
.move-chip{font-family:monospace;font-size:11px;min-width:28px;text-align:center;background:#252a2e;padding:7px 5px;border-radius:4px;color:#c0c7cb}
.move-chip:last-child{background:#35402e;color:var(--lime)}
.history-total{font-size:9px;letter-spacing:0;color:#737e84;white-space:nowrap}
footer{display:flex;justify-content:space-between;align-items:center;color:#59636a;padding:29px 0;font-size:8px;letter-spacing:1.2px}
footer>span:first-child{font-size:11px;letter-spacing:0}
.footer-star{color:var(--lime);font-size:18px;vertical-align:middle;margin-left:12px}
@media(min-width:1300px){main{padding-top:62px}
.intro{margin-bottom:38px}
}
@media(max-width:850px){.header-note{display:none}
main{padding:30px 20px 0}
.workspace{grid-template-columns:1fr 340px;gap:15px}
.controls{padding:20px}
.stage-caption{display:none}
.intro p{font-size:11px}
h1{font-size:44px}
.stage-top{padding:18px}
.stage-label{font-size:7px}
.history{gap:12px;padding:17px}
.face-row{padding-left:7px;gap:3px}
:root{--unit:52px}
}
@media(max-width:700px){.header{padding:20px}
.workspace{grid-template-columns:1fr}
.intro{margin-bottom:24px}
.intro p{position:static;margin-top:12px;font-size:12px}
.intro p br{display:none}
h1{font-size:43px;margin:14px 0;letter-spacing:-2px}
.intro .eyebrow{font-size:9px}
.playground{min-height:440px}
.viewport{min-height:260px}
.controls{padding:24px}
.face-row button{min-height:44px;min-width:42px}
.face-name{font-size:12px}
.face-controls{gap:12px}
.history{flex-wrap:wrap;gap:12px}
.recent-moves{order:3;flex-basis:100%}
.history-total{margin-left:auto}
footer>span:last-child{font-size:6px;letter-spacing:.5px}
.stage-caption{display:block}
:root{--unit:60px}
.stage-label{font-size:9px}
}
@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}
}