:root{--nx-void: #070914;--nx-ink: #e8eaf6;--nx-bone: #f3f4ff;--nx-dim: #8a90b4;--nx-faint: #4a5078;--nx-panel: rgba(10, 12, 27, .78);--nx-panel-2: rgba(22, 26, 54, .9);--nx-solid: #0a0c1b;--nx-line: #1f2444;--nx-line-2: #2e3563;--nx-indigo: #8f88ff;--nx-mono: "Nexus Flags", "Nexus Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;--nx-display: "Nexus Flags", "Nexus Petch", "Segoe UI", system-ui, sans-serif}.nx-prompt{position:relative;display:block;font:14px/1.5 var(--nx-mono);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%;min-width:0;color:var(--nx-ink)}.nx-ps1{color:var(--nx-indigo)}.nx-cmd{color:var(--nx-ink)}.nx-caret{display:inline-block;width:8px;height:15px;margin-left:3px;vertical-align:-2px;background:var(--nx-indigo);animation:nx-blink 1.1s steps(1) infinite}.nx-typing .nx-caret{animation:none}@keyframes nx-blink{50%{opacity:0}}.nx-sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}.nx-topline{border-bottom:1px solid var(--nx-line);padding-bottom:8px;margin-bottom:14px}.nx-facts{margin:0;display:grid;grid-template-columns:repeat(3,auto);gap:4px 22px;font:13px/1.45 var(--nx-mono)}.nx-fact{display:flex;flex-direction:column;min-width:0}.nx-fact dt{color:var(--nx-dim);font-size:11px}.nx-fact dd{margin:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:var(--c, var(--nx-ink));font-variant-numeric:tabular-nums}.nx-numbers{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:8px;font-family:var(--nx-mono)}.nx-stat{position:relative;display:flex;flex-direction:column;min-width:0;padding:8px 10px 8px 13px;border:1px solid var(--nx-line);background:var(--nx-panel)}.nx-stat:before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--c, var(--nx-indigo))}.nx-stat-label{color:var(--nx-dim);font-size:11px}.nx-stat-value{font:400 24px/1.15 var(--nx-display);color:var(--nx-bone);font-variant-numeric:tabular-nums;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.nx-stat-note{color:var(--nx-faint);font-size:11px;min-height:1.4em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.nx-statusline{display:flex;flex-wrap:wrap;gap:4px 18px;font:11px/1.5 var(--nx-mono);color:var(--nx-dim);border-top:1px solid var(--nx-line);padding:6px 0 10px;margin-top:16px}.nx-statusline b{color:var(--nx-ink);font-weight:500;font-variant-numeric:tabular-nums}.nx-statusline kbd{border:1px solid var(--nx-line-2);padding:0 4px;border-radius:2px;color:var(--nx-ink);font:inherit}.nx-panel{margin:0;border:1px solid var(--nx-line);background:var(--nx-panel);padding:8px 10px 10px;min-width:0}.nx-panel>figcaption,.nx-panel>h2{display:flex;justify-content:space-between;align-items:center;gap:10px;margin:0 0 6px;font:400 13px/1.4 var(--nx-mono);color:var(--nx-dim)}.nx-panel>h2{display:block}.nx-panel>figcaption>span:first-child:before,.nx-panel>h2:before{content:"> ";color:var(--nx-indigo)}.nx-charts{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:10px}.nx-chart{min-height:40px;background:var(--nx-solid)}.nx-chart svg{display:block;max-width:100%}.nx-section-title{margin:22px 0 8px;font:400 22px/1 var(--nx-display);color:var(--nx-dim)}.nx-how{display:grid;grid-template-columns:minmax(0,3fr) minmax(0,2fr);gap:10px 18px;font:13px/1.6 var(--nx-mono);color:var(--nx-ink)}.nx-how p{margin:0 0 10px;max-width:70ch}.nx-how h3{margin:0 0 6px;font:500 16px/1.2 var(--nx-display);color:var(--nx-bone)}.nx-eq{margin:0 0 10px;padding:12px 14px;border:1px solid var(--nx-line-2);border-left:3px solid var(--nx-indigo);background:var(--nx-solid);font:400 17px/1.5 var(--nx-display);color:var(--nx-bone);overflow-x:auto;text-shadow:0 0 12px rgba(143,136,255,.35)}.nx-eq small{display:block;font:11px/1.5 var(--nx-mono);color:var(--nx-dim);text-shadow:none}.nx-why{color:var(--nx-dim);font-style:normal;border-top:1px dashed var(--nx-line-2);padding-top:8px}.nx-why:before{content:"why it is beautiful: ";color:var(--nx-indigo)}.nx-rail{display:flex;flex-wrap:wrap;gap:8px 10px;align-items:center;font:13px/1.45 var(--nx-mono)}.nx-field{display:flex;align-items:center;gap:6px;color:var(--nx-dim);min-width:0}.nx-field output{color:var(--nx-ink);min-width:3ch}.nx-rail select,.nx-rail input[type=text],.nx-rail input[type=number]{background:var(--nx-panel);border:1px solid var(--nx-line-2);border-radius:2px;padding:4px 6px;color:var(--nx-ink);font:inherit;min-width:0}.nx-rail input[type=text]{width:110px}.nx-rail input[type=range]{width:110px;accent-color:var(--accent, var(--nx-indigo))}.nx-rail input[type=checkbox]{accent-color:var(--accent, var(--nx-indigo))}.nx-btn{background:var(--nx-panel);border:1px solid var(--nx-line-2);border-radius:2px;padding:4px 10px;color:var(--nx-ink);font:inherit;cursor:pointer}.nx-btn:hover{border-color:var(--nx-dim)}.nx-btn.primary{background:var(--accent, var(--nx-indigo));color:#0a0b1a;border-color:var(--accent, var(--nx-indigo));font-weight:600}.nx-btn.icon{padding:4px 8px;min-width:30px;display:inline-flex;align-items:center;justify-content:center}.nx-btn[aria-pressed=true]{border-color:var(--accent, var(--nx-indigo));color:var(--nx-bone)}.nx-btn:disabled{opacity:.5;cursor:default}.nx-hero{position:relative;border:1px solid var(--nx-line);background:#05060f;overflow:hidden;touch-action:none}.nx-hero>canvas{display:block;width:100%;height:100%}.nx-hero:before,.nx-hero:after{content:"";position:absolute;width:14px;height:14px;border:1px solid var(--nx-indigo);z-index:3;pointer-events:none}.nx-hero:before{top:6px;left:6px;border-right:0;border-bottom:0}.nx-hero:after{bottom:6px;right:6px;border-left:0;border-top:0}.nx-hud{position:absolute;z-index:4;font:12px/1.4 var(--nx-mono);pointer-events:none;font-variant-numeric:tabular-nums}.nx-hud.tl{top:14px;left:16px}.nx-hud.tr{top:14px;right:16px;text-align:right;color:var(--nx-dim)}.nx-hud.bl{bottom:12px;left:16px}.nx-hud.br{bottom:12px;right:14px;pointer-events:auto;display:flex;gap:4px}.nx-now{font:400 26px/1 var(--nx-display);color:var(--c, var(--nx-bone));text-shadow:0 0 14px rgba(143,136,255,.35)}.nx-now-sub{color:var(--nx-dim);margin-top:3px}.nx-transport{display:flex;flex-wrap:wrap;align-items:center;gap:6px;margin-top:8px;font:13px/1.45 var(--nx-mono)}.nx-transport select{background:var(--nx-panel);border:1px solid var(--nx-line-2);border-radius:2px;padding:4px 6px;color:var(--nx-ink);font:inherit}.nx-seek{position:relative;flex:1 1 220px;min-width:0;height:30px;border:1px solid var(--nx-line);background:var(--nx-panel);cursor:pointer;user-select:none;touch-action:none;overflow:hidden}.nx-seek-segs{position:absolute;inset:0;display:flex}.nx-seek-segs>div{min-width:0;border-right:1px solid #05060f;background:color-mix(in srgb,var(--c) 18%,transparent);overflow:hidden}.nx-seek-segs span{display:block;padding:6px 5px 0;font-size:10px;white-space:nowrap;color:var(--nx-bone);overflow:hidden;text-overflow:ellipsis;position:relative;z-index:1}.nx-seek-fill{position:absolute;inset:0 auto 0 0;background:#8f88ff38;border-top:2px solid var(--nx-indigo);pointer-events:none}.nx-playhead{position:absolute;top:0;bottom:0;width:2px;background:var(--nx-bone);box-shadow:0 0 8px #f3f4ff99;pointer-events:none}.nx-clock{font:400 16px/1 var(--nx-display);color:var(--nx-bone);min-width:7.5em;text-align:right;white-space:nowrap;font-variant-numeric:tabular-nums}.nx-live .nx-seek,.nx-live [data-a=back],.nx-live [data-a=fwd]{display:none}.nx-seek-segs>div.on{background:color-mix(in srgb,var(--c) 40%,transparent)}.nx-badges{font:12px/1.4 var(--nx-mono)}.nx-badges-head{display:flex;justify-content:space-between;color:var(--nx-dim);margin-bottom:6px}.nx-badges-head span:first-child:before{content:"> ";color:var(--nx-indigo)}.nx-badges ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:6px}.nx-badges li{display:flex;gap:8px;align-items:flex-start;padding:6px 8px;border:1px dashed var(--nx-line-2);color:var(--nx-faint);min-width:0}.nx-badges li i{flex:none;width:12px;height:12px;margin-top:2px;transform:rotate(45deg);border:1px solid var(--nx-faint)}.nx-badges li b{display:block;font-weight:500}.nx-badges li small{display:block;font-size:11px}.nx-badges li.got{border-style:solid;border-color:var(--nx-line-2);color:var(--nx-ink);background:var(--nx-panel)}.nx-badges li.got i{border-color:transparent;background:linear-gradient(135deg,#ff5d5d,#ffe066,#4fb6ff,#e383ff);box-shadow:0 0 10px #e383ff99}.nx-badges li.got small{color:var(--nx-dim)}.nx-toast{position:fixed;left:50%;bottom:24px;z-index:70;transform:translate(-50%,20px);opacity:0;pointer-events:none;padding:8px 14px;border:1px solid var(--nx-line-2);background:#0a0c1b;color:var(--nx-ink);font:12px/1.4 var(--nx-mono);box-shadow:0 0 18px #8f88ff59;transition:opacity .25s,transform .25s;max-width:calc(100vw - 32px)}.nx-toast.on{opacity:1;transform:translate(-50%)}.nx-toast b{color:var(--nx-indigo);font-weight:600}@media(max-width:1050px){.nx-facts{grid-template-columns:repeat(2,minmax(0,1fr))}.nx-how{grid-template-columns:minmax(0,1fr)}}@media(max-width:600px){.nx-prompt{font-size:12px}.nx-facts{gap:6px 14px}.nx-numbers{grid-template-columns:repeat(2,minmax(0,1fr))}.nx-stat-value{font-size:19px}.nx-seek{flex:1 1 100%;order:5}.nx-rail .nx-field{flex:1 1 140px}.nx-rail select,.nx-rail input[type=text]{flex:1;width:auto}.nx-clock{min-width:0}}@media(prefers-reduced-motion:reduce){.nx-caret{animation:none}.nx-toast{transition:none}}:root{--void: #070914;--ink: #e8eaf6;--dim: #8a90b4;--faint: #4a5078;--panel: rgba(10, 12, 27, .78);--line: #2e3563;--accent: var(--green);--red: #ff5d5d;--orange: #ff9f43;--yellow: #ffe066;--green: #5fe38a;--blue: #4fb6ff;--indigo: #8f88ff;--violet: #e383ff;--mono: "Nexus Flags", "Nexus Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;--display: "Nexus Flags", "Nexus Petch", "Segoe UI", system-ui, sans-serif;color-scheme:dark}*{box-sizing:border-box}html{background:var(--void)}body{margin:0;background:transparent;color:var(--ink);font:13px/1.5 var(--mono);-webkit-font-smoothing:antialiased}button,input,select,textarea{font:inherit;color:inherit}:focus-visible{outline:1px solid var(--accent);outline-offset:2px}.app{padding:16px max(14px,var(--nexus-gutter, 0px)) 0;max-width:calc(1400px + 2 * var(--nexus-gutter, 0px));margin:0 auto}.app>*{min-width:0}.nx-prompt{position:relative}.head{display:flex;flex-wrap:wrap;gap:8px 28px;align-items:flex-end;justify-content:space-between;margin-bottom:14px}.head>*{min-width:0}.head h1{margin:0;font:300 clamp(36px,5vw,64px) / 1 var(--display);letter-spacing:.05em;color:#f3f4ff;text-shadow:-1px 0 rgba(255,93,93,.45),1px 0 rgba(79,182,255,.45),0 0 18px rgba(143,136,255,.45)}.sub{margin:10px 0 0;color:var(--dim);max-width:64ch}.stage{margin-top:10px;height:clamp(380px,64vh,640px);display:grid;grid-template-columns:auto minmax(0,1fr);touch-action:pan-y}.pane{position:relative;min-width:0;min-height:0}.pane>canvas{display:block;width:100%;height:100%}.plane-pane{height:100%;aspect-ratio:1;max-width:58vw;border-right:1px solid #1f2444;cursor:crosshair}.net-pane{cursor:pointer}.nx-hud b{font-weight:500}#hud-legend{display:flex;flex-direction:column;gap:2px;font-size:11px}#hud-legend span{display:flex;align-items:center;justify-content:flex-end;gap:6px}.sw{display:inline-block;width:16px;height:3px;border-radius:2px}.sw.pos{background:#ff9f43}.sw.neg{background:#8f88ff}.sw.fwd{background:linear-gradient(90deg,#ff5d5d,#ffe066,#5fe38a,#4fb6ff,#e383ff);height:6px;width:6px;border-radius:50%;box-shadow:0 0 6px #ffe066}.sw.back{background:#f3f4ff;height:6px;width:6px;border-radius:50%;box-shadow:0 0 6px #c9c5ff}#hud-hint{color:var(--dim);font-size:11px;background:#05060f99;padding:1px 5px}.neuron-card{position:absolute;left:12px;bottom:12px;z-index:5;width:270px;display:grid;grid-template-columns:100px minmax(0,1fr);grid-template-areas:"map head" "map sub";grid-template-rows:auto 1fr;gap:2px 8px;padding:6px 8px;border:1px solid #2e3563;background:#070914eb;box-shadow:0 0 18px #e383ff2e;font-size:11px;cursor:default}.neuron-card[hidden]{display:none}.nc-head{grid-area:head}#nc-map{grid-area:map}.nc-sub{grid-area:sub}.nc-head{display:flex;justify-content:space-between;align-items:center;gap:6px;color:#f3f4ff}.nc-head b{font-weight:500}.nc-head .nx-btn{padding:0 6px;min-width:0;line-height:1.3}#nc-map{display:block;width:100px;height:100px;border:1px solid #1f2444}.nc-sub{color:var(--dim);line-height:1.35}.trainbar{display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px;margin-top:8px;font:13px/1.45 var(--mono)}.trainbar select{background:var(--panel);border:1px solid #2e3563;border-radius:2px;padding:4px 6px}#train{gap:6px;padding:4px 12px}.clockish{font:400 18px/1 var(--display);color:#f3f4ff;min-width:6.5em}.tools{display:inline-flex;flex-wrap:wrap;align-items:center;gap:4px}.tools-label{color:var(--dim);margin-right:2px}.tool{display:inline-flex;align-items:center;gap:5px}.dot{display:inline-block;width:8px;height:8px;border-radius:50%}.dot.c0{background:#4fb6ff;box-shadow:0 0 6px #4fb6ff}.dot.c1{background:#ff5d5d;box-shadow:0 0 6px #ff5d5d}.dot.c2{background:#ffe066;box-shadow:0 0 6px #ffe066}.trainbar-end{display:inline-flex;flex-wrap:wrap;gap:6px;align-items:center;margin-left:auto}.toggle{cursor:pointer}.toggle input{accent-color:var(--accent)}.walk{margin-top:14px}.walk-top{display:flex;align-items:center;gap:8px}.walk-top #transport{flex:1;min-width:0;margin-top:0}.walk-body{display:grid;grid-template-columns:minmax(0,3fr) minmax(0,2fr);gap:10px 16px;margin-top:10px;align-items:start}.walk-text{min-height:7.5em}.walk-text p{margin:0 0 6px}.walk-text b{color:#f3f4ff;font-weight:600}.mathline{font-size:12px;color:var(--ink);overflow-wrap:anywhere;padding-left:10px;border-left:2px solid #2e3563}.warn{color:#ffe066}.walk-chain{font-size:15px;overflow-wrap:anywhere;overflow-x:hidden}.nx-charts,.how,#badges,.challenges{margin-top:14px}.hint{font-size:11px;color:var(--faint)}.short{display:none}.challenges ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:8px}.challenges li{display:flex;flex-direction:column;gap:3px;padding:6px 8px;border:1px dashed #2e3563;min-width:0}.challenges li>b{color:#f3f4ff;font-weight:500}.challenges li span{color:var(--dim);font-size:12px}.challenges li span b{color:var(--accent)}.chips{display:flex;flex-wrap:wrap;gap:4px}.chips i{font-style:normal;border:1px solid #2e3563;padding:0 6px;font-size:11px;color:var(--dim)}.chips i.ok{border-color:var(--accent);color:var(--ink)}.digits{margin-top:14px}.dg-grid{display:grid;grid-template-columns:minmax(0,260px) minmax(0,1fr) minmax(0,1.2fr);gap:14px;align-items:start}.dg-grid>*{min-width:0}.dg-pad{display:block;width:100%;max-width:260px;aspect-ratio:1;border:1px solid #2e3563;touch-action:none;cursor:crosshair;background:#05060f}.dg-row{display:flex;gap:10px;align-items:center;margin-top:8px}.dg-seen{display:flex;gap:8px;align-items:center;color:var(--dim);font-size:11px;line-height:1.3;min-width:0}.dg-seen canvas{width:48px;height:48px;image-rendering:pixelated;border:1px solid #2e3563;flex:none}.dg-fig{margin:0}.dg-fig>figcaption{color:var(--dim);margin-bottom:6px}.dg-fig>figcaption span:before{content:"> ";color:#8f88ff}.dg-guess{display:flex;align-items:baseline;gap:10px;min-height:52px}.dg-guess b{font:300 48px/1 var(--display);color:var(--c, #f3f4ff);text-shadow:0 0 16px var(--c, #8f88ff)}.dg-guess span{color:var(--dim)}.dg-guess .dg-wait{color:var(--faint);align-self:center}.dg-conf-wrap{overflow-x:auto}.dg-table{border-collapse:collapse;font-size:11px;background:#0a0c1b}.dg-table th,.dg-table td{width:26px;height:22px;text-align:center;padding:0;border:1px solid #141a36}.dg-table th{color:var(--dim);font-weight:400}.dg-table th.corner{width:auto;padding:0 4px;color:var(--faint);font-size:10px;white-space:nowrap}.dg-table td{color:#f3f4ff}.dg-acc{margin:6px 0;color:var(--dim);font-size:12px}.dg-acc b{color:var(--green);font-weight:600}.dg-progress{display:flex;flex-wrap:wrap;align-items:center;gap:6px 12px;margin-top:12px;font-size:12px;color:var(--dim)}.dg-bar{flex:0 1 220px;min-width:120px;height:8px;border:1px solid #2e3563;background:#0a0c1b;overflow:hidden}.dg-bar i{display:block;height:100%;width:0;background:linear-gradient(90deg,#4fb6ff,#5fe38a);box-shadow:0 0 8px #5fe38a;transition:width .2s}.dg-bar.done i{background:#5fe38a}.digits .note{margin:8px 0 0;color:var(--dim);font-size:12px;max-width:110ch}@media(max-width:1050px){.dg-grid{grid-template-columns:minmax(0,260px) minmax(0,1fr)}.dg-grid>.dg-fig:last-child{grid-column:1 / -1}}@media(max-width:600px){.dg-grid{grid-template-columns:minmax(0,1fr)}.dg-pad{max-width:100%}}@media(max-width:760px){.stage{height:auto;grid-template-columns:minmax(0,1fr)}.plane-pane{height:auto;width:100%;max-width:none;aspect-ratio:1;border-right:0;border-bottom:1px solid #1f2444}.net-pane{height:300px}.walk-body{grid-template-columns:minmax(0,1fr)}.trainbar-end{margin-left:0}}@media(max-width:600px){.walk-top{flex-wrap:wrap}.walk-top #transport{flex:1 1 100%}.nx-rail input[type=range]{flex:1;min-width:0;width:auto}.long{display:none}.short{display:inline}.neuron-card{width:auto;right:12px;left:12px;bottom:8px;grid-template-columns:80px minmax(0,1fr)}#nc-map{width:80px;height:80px}.nx-now{font-size:21px}#hud-legend{font-size:10px;flex-flow:row wrap;gap:0 10px;justify-content:flex-end;top:8px;left:12px;right:12px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important}}