:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--base:#faf4ed;--surface:#fffaf3;--overlay:#f2e9e1;--muted:#9893a5;--subtle:#797593;--ink:#575279;--love:#b4637a;--gold:#ea9d34;--rose:#d7827e;--pine:#286983;--foam:#56949f;--iris:#907aa9;--highlight-low:#f4ede8;--highlight-med:#dfdad9;--highlight-high:#cecacd;--paper:var(--base);--panel:var(--surface);--line:var(--ink);--orange:var(--rose);--green:var(--pine);--blue:var(--iris);--yellow:var(--gold);--shadow:4px 4px 0 #57527975;font-family:ui-monospace,SFMono-Regular,Consolas,Liberation Mono,monospace}*{box-sizing:border-box;scrollbar-width:thin;scrollbar-color:var(--iris) var(--overlay)}::-webkit-scrollbar{width:10px;height:10px}::-webkit-scrollbar-track{background:var(--overlay)}::-webkit-scrollbar-thumb{border:2px solid var(--overlay);background:var(--iris);border-radius:2px;min-height:28px}::-webkit-scrollbar-thumb:hover{background:var(--love)}::-webkit-scrollbar-corner{background:var(--overlay)}html{background:var(--paper);min-width:320px}body{min-width:320px;min-height:100vh;color:var(--ink);background:linear-gradient(90deg, #907aa917 1px, transparent 1px) 0 0 / 36px 36px, linear-gradient(#907aa917 1px, transparent 1px) 0 0 / 36px 36px, var(--paper);margin:0}button,input,select{font:inherit}button{color:inherit}button:not(:disabled),select:not(:disabled),input:not(:disabled){cursor:pointer}button:focus-visible,input:focus-visible,select:focus-visible,[tabindex]:focus-visible{outline-offset:3px;outline:3px solid #907aa961}.skip-link{z-index:100;color:#fff;background:var(--ink);border-radius:2px;padding:10px 14px;position:fixed;top:10px;left:10px;transform:translateY(-150%)}.skip-link:focus{transform:translateY(0)}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.app-shell{width:min(1600px,100%);min-height:100vh;margin:0 auto}.topbar{border-bottom:2px solid var(--line);justify-content:space-between;align-items:center;gap:24px;min-height:66px;padding:11px clamp(16px,2.4vw,36px);display:flex}.brand{color:inherit;align-items:center;gap:12px;text-decoration:none;display:inline-flex}.brand-mark{background:var(--ink);border-radius:2px;grid-template-rows:1fr 1fr;grid-template-columns:1fr 1fr;gap:3px;width:34px;height:34px;padding:4px;display:grid;box-shadow:3px 3px #57527940}.brand-mark i{background:var(--base);border-radius:1px}.brand-mark i:nth-child(2){background:var(--orange)}.brand-mark i:nth-child(3){background:var(--green)}.brand-mark i:nth-child(4){background:var(--blue)}.brand-copy{line-height:1;display:grid}.brand-copy strong{letter-spacing:-.8px;font-family:Georgia,Times New Roman,serif;font-size:25px;font-weight:600}.brand-copy small{letter-spacing:.2em;color:var(--muted);margin-top:5px;font-size:8px;font-weight:800}.topbar-tools{justify-content:flex-end;align-items:center;gap:12px;display:flex}.icon-sprite{width:0;height:0;position:absolute;overflow:hidden}.ui-icon{fill:none;stroke:currentColor;stroke-width:1.8px;stroke-linecap:round;stroke-linejoin:round;pointer-events:none;flex:none;width:15px;height:15px;display:block}.icon-fill{fill:currentColor;stroke:none}.size-control{border:2px solid var(--line);background:var(--panel);height:42px;color:var(--subtle);border-radius:2px;grid-template-columns:auto 32px 52px 32px;align-items:center;font-size:12px;font-weight:700;display:grid;overflow:hidden;box-shadow:2px 2px #57527929}.size-control>span:first-child{padding:0 11px}.size-value{background:var(--surface);border-left:1px solid #57527957;justify-content:center;align-self:stretch;align-items:center;display:flex}.size-control input{width:calc(var(--size-digits,1) * 1ch);min-width:1ch;max-width:4ch;height:100%;color:var(--ink);text-align:center;-moz-appearance:textfield;-webkit-appearance:none;appearance:textfield;background:0 0;border:0;outline:0;padding:0;font-weight:800;line-height:1}.size-control input::-webkit-inner-spin-button{appearance:none;margin:0}.size-control input::-webkit-outer-spin-button{appearance:none;margin:0}.size-suffix{color:var(--subtle);pointer-events:none;margin-left:2px;line-height:1}.size-step{width:32px;color:var(--ink);background:var(--highlight-low);border:0;border-left:1px solid #57527957;align-self:stretch;place-items:center;padding:0;display:grid}.size-step:hover:not(:disabled){color:var(--surface);background:var(--iris)}.size-step:active:not(:disabled){background:var(--love)}.size-step:disabled{color:var(--highlight-high);background:var(--highlight-low);cursor:default}.icon-button{border:2px solid var(--line);background:var(--panel);border-radius:2px;width:42px;height:42px;font-family:Georgia,serif;font-size:18px}.icon-button:hover{background:var(--ink);color:#fff}.workspace{--cube-stage-height:clamp(420px, 52vw, 620px);grid-template-columns:minmax(0,1.72fr) minmax(320px,.78fr);align-items:stretch;gap:12px;padding:12px clamp(12px,2vw,30px) 30px;display:grid}.stage-card,.control-panel{height:calc(var(--cube-stage-height) + 120px);border:2px solid var(--line);box-shadow:var(--shadow);background:#fffaf3f7;border-radius:3px;overflow:hidden}.stage-card{flex-direction:column;min-width:0;display:flex}.control-panel{flex-direction:column;align-self:stretch;min-width:0;min-height:0;display:flex}#solve-panel{flex:none}.stage-header{border-bottom:2px solid var(--line);justify-content:space-between;align-items:center;gap:16px;min-height:62px;padding:13px 16px;display:flex}.eyebrow{color:var(--subtle);letter-spacing:.2em;margin:0 0 6px;font-size:8px;font-weight:900}h1,h2,h3,p{margin-top:0}.stage-header h1{letter-spacing:-.035em;margin-bottom:0;font-family:Georgia,serif;font-size:clamp(21px,2vw,28px);font-weight:500}.stage-status{color:var(--muted);align-items:center;gap:8px;font-size:11px;font-weight:700;display:flex}.status-dot{background:var(--green);border-radius:50%;width:8px;height:8px;transition:background .16s}.stage-status.busy .status-dot{background:var(--yellow);animation:1s infinite pulse}.stage-status.error .status-dot{background:var(--orange)}.cube-stage{min-height:var(--cube-stage-height);background:radial-gradient(circle at 50% 46%, #fffaf3fa, #f2e9e1b8 46%, #dfdad9eb 100%), var(--overlay);touch-action:none;-webkit-user-select:none;user-select:none;flex:auto;position:relative;overflow:hidden}.canvas-mount{position:absolute;inset:0}.canvas-mount canvas{width:100%;height:100%;display:block}.stage-vignette{pointer-events:none;position:absolute;inset:0;box-shadow:inset 0 0 120px #5752791a}.rear-view-frame{z-index:2;left:var(--rear-view-margin,12px);bottom:var(--rear-view-margin,12px);width:var(--rear-view-width,200px);height:var(--rear-view-height,144px);border:2px solid var(--ink);pointer-events:none;border-radius:2px;position:absolute;box-shadow:2px 2px #57527940}.rear-view-frame span{color:var(--surface);border-right:2px solid var(--ink);border-bottom:2px solid var(--ink);letter-spacing:.12em;text-transform:uppercase;background:#575279f0;padding:5px 7px 4px;font-size:7px;font-weight:900;position:absolute;top:-2px;left:-2px}.stage-readout{color:var(--subtle);border:1px solid var(--line);letter-spacing:.08em;text-transform:uppercase;pointer-events:none;background:#fffaf3d1;border-radius:2px;align-items:center;gap:9px;padding:8px 10px;font-size:9px;font-weight:800;display:flex;position:absolute}.top-left{top:12px;left:12px}.performance-toggle{z-index:3;min-width:58px;height:28px;color:var(--surface);border:1px solid var(--ink);letter-spacing:.08em;text-transform:uppercase;background:#575279f0;border-radius:2px;padding:0 9px;font-size:8px;font-weight:900;position:absolute;top:12px;right:12px;box-shadow:2px 2px #57527940}.performance-toggle:before{content:"";background:var(--muted);width:6px;height:6px;margin-right:6px;display:inline-block}.performance-toggle.active:before{background:var(--foam);box-shadow:0 0 8px #56949fad}.performance-hud{z-index:3;width:min(230px,100% - 24px);color:var(--surface);border:2px solid var(--ink);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);background:#575279f2;border-radius:2px;padding:11px;position:absolute;top:46px;right:12px;box-shadow:4px 4px #57527940}.performance-hud[hidden]{display:none}.hud-title{color:var(--gold);letter-spacing:.12em;text-transform:uppercase;border-bottom:1px solid #fffaf342;padding-bottom:8px;font-size:8px;font-weight:900;display:block}.performance-hud dl{grid-template-columns:1fr 1fr;gap:8px 14px;margin:10px 0 0;display:grid}.performance-hud dl div{grid-template-columns:1fr auto;align-items:baseline;gap:6px;display:grid}.performance-hud dt{color:#fffaf39e;text-transform:uppercase;font-size:7px}.performance-hud dd{color:var(--surface);margin:0;font-size:9px;font-weight:800}.interaction-hint{right:17px;bottom:var(--rear-view-margin,12px);color:var(--subtle);border:1px solid var(--line);pointer-events:none;background:#fffaf3d1;border-radius:2px;align-items:center;gap:10px;padding:10px 12px;font-size:9px;line-height:1.45;display:flex;position:absolute}.interaction-hint strong{color:var(--ink);font-weight:800}.mouse-glyph{border:1.5px solid var(--subtle);border-radius:9px;width:16px;height:23px;position:relative}.mouse-glyph:after{content:"";background:var(--subtle);border-radius:2px;width:2px;height:5px;position:absolute;top:4px;left:6px}.loading-cover{background:var(--overlay);z-index:4;place-content:center;justify-items:center;gap:12px;transition:opacity .28s,visibility 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var(--ink);background:var(--ink)}.secondary-button:hover{background:var(--highlight-low)}.dark-button:hover{background:var(--pine)}.solver-capability{color:var(--muted);margin:0 0 12px;font-size:8px;line-height:1.45}.solver-capability.limited{color:var(--love)}.solve-button{width:100%;min-height:42px;color:var(--surface);background:var(--orange);border:0;justify-content:space-between;align-items:center;padding:0 17px;display:flex;box-shadow:3px 3px #d7827e47}.solve-button i{background:#fffaf333;border-radius:2px;place-items:center;width:24px;height:24px;font-style:normal;display:grid}.solve-button i .ui-icon{width:15px;height:15px}.solve-button:hover{background:var(--love);transform:translateY(-1px)}.solve-button:disabled{opacity:.55;cursor:wait;transform:none}.solve-progress{border:1px solid var(--line);background:var(--panel);border-radius:2px;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:9px;margin-top:10px;padding:10px;display:grid;box-shadow:2px 2px 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