:root{color-scheme:light;--paper:#f8f7ef;--ink:#173e35;--muted:#65766a;--line:#dbe2d7;--blue:#376ccd;--coral:#b45e43;--lime:#ecedb6}
[hidden]{display:none!important}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.5 system-ui,-apple-system,"Segoe UI",sans-serif;font-variant-numeric:tabular-nums}button,input,select{font:inherit}button{cursor:pointer}button:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--blue);outline-offset:4px}button:disabled{cursor:default}
.experience{max-width:1060px;margin:auto;padding:clamp(16px,3vw,32px)}.heading{margin-bottom:24px}.eyebrow{font-size:10px;letter-spacing:.16em;font-weight:700;line-height:1.5}.heading .eyebrow{display:flex;align-items:center;justify-content:space-between;color:var(--muted)}.heading .eyebrow>span{letter-spacing:.06em;font-size:12px;border:1px solid var(--line);border-radius:999px;padding:4px 11px}h1{font-size:clamp(27px,3.2vw,38px);line-height:1.13;letter-spacing:-.045em;font-weight:650;margin:15px 0 12px}.heading p{font-size:15px;color:var(--muted);margin:0;line-height:1.55}.workspace{display:grid;gap:22px;min-width:0}.network-panel{min-width:0}
.steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px 14px;margin:0;padding:0;list-style:none}.steps li{display:flex;align-items:center;gap:7px;font-size:12px;color:var(--muted);font-weight:600;border-bottom:2px solid var(--line);padding:0 0 8px}.steps li>span{font-size:10px;color:#758674}.steps li.active{color:var(--ink);border-color:var(--ink)}.steps li.active>span{color:var(--blue)}.stage-label{font-size:14px;line-height:1.5;min-height:44px;margin:12px 0 10px;font-weight:550}
.network-surface{padding:24px 14px 13px;border:1px solid var(--line);border-radius:24px;background:#fefefb;background-image:radial-gradient(#173e350e 1px,transparent 1px);background-size:18px 18px}.net{position:relative;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-template-rows:repeat(2,88px);gap:60px 26px;align-items:center;justify-items:center;isolation:isolate}#wires{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;z-index:-1;overflow:visible}
.node{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;width:108px;height:88px;border:1px solid var(--line);border-radius:21px;background:#fdfefb;box-shadow:0 3px 10px #173e3505;color:var(--ink);padding:7px;transition:border-color .2s,box-shadow .2s,background .2s}.node-name{font-size:13px;font-weight:600}.node-value{font-size:24px;font-weight:650;letter-spacing:-.025em;line-height:1.1}.node.pending .node-value{font-size:13px;letter-spacing:0;font-weight:450;color:var(--muted)}.input-node{background:#edf1e7;border-color:#dbe4d4}.node-grad{font-size:11px;font-weight:600;line-height:1.2}.neuron-node.computed,.output-node.computed{border-color:#bacab0}.output-node{background:var(--ink);border-color:var(--ink);color:white;width:112px;height:100px;border-radius:24px}.output-node.pending .node-value{color:#d3e2d4}.output-node .node-value{color:var(--lime);font-size:27px}.output-node .node-grad{color:var(--lime)}.node-grad{color:inherit}
#node-x1{grid-area:1/1}#node-x2{grid-area:2/1}#node-h1{grid-area:1/2}#node-h2{grid-area:2/2}#node-y{grid-area:1/3/3/4}
.legend{display:flex;flex-wrap:wrap;justify-content:center;gap:12px 18px;color:var(--muted);font-size:11px;margin-top:20px}.legend>span{display:flex;align-items:center;gap:5px;white-space:nowrap}.legend i{width:16px;height:3px;border-radius:2px;background:var(--blue)}.legend .negative{background:var(--coral)}.legend .reverse-mark{background:repeating-linear-gradient(90deg,#758674 0 5px,transparent 5px 8px);height:5px}
.play-controls{display:grid;grid-template-columns:1.18fr 1fr 44px;gap:8px;margin-top:16px}.play-controls button{display:flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:10px 12px;white-space:nowrap;border:1px solid var(--line);border-radius:12px;background:#fefefb;color:var(--ink);font-size:13px;font-weight:600}.play-controls button:hover{border-color:#9eafa0}.play-controls .primary{background:var(--ink);border-color:var(--ink);color:white}.play-controls .primary:hover{background:#28554a}.play-controls .primary[data-playing=true]{background:var(--blue);border-color:var(--blue)}.play-controls svg{width:17px;height:17px;fill:currentColor;flex-shrink:0}.play-controls .reset-button{padding:10px}.reset-button svg{fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.hint{font-size:12px;color:var(--muted);margin:10px 0 16px;line-height:1.55}
.result-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;border:1px solid var(--line);border-radius:16px;background:#f3f6f0;padding:12px}.result{display:flex;flex-direction:column;gap:4px;min-width:0}.result span{font-size:11px;color:var(--muted)}.result strong{font-size:22px;font-weight:650;letter-spacing:-.03em;line-height:1.15;overflow-wrap:anywhere}
.control-row{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.4fr);gap:10px 16px;margin-top:14px}.control{display:block;min-width:0}.control>span{display:flex;align-items:baseline;justify-content:space-between;gap:5px;font-size:13px;font-weight:550;min-width:0}.control output{font-size:16px;font-weight:650;letter-spacing:-.02em}.control input{display:block;width:100%;min-width:0;height:40px;margin:3px 0 0;padding:0;accent-color:var(--ink);cursor:pointer;touch-action:pan-y}.control select{width:100%;min-height:44px;margin-top:4px;padding:8px 12px;border:1px solid var(--line);border-radius:12px;background:#fefefb;color:var(--ink);font-weight:600}
.inspector{min-width:0;padding:22px;border:1px solid var(--line);border-radius:24px;background:#fefefb}.inspector-heading{padding-bottom:14px}.inspector-heading .eyebrow{color:var(--muted);font-size:9px}.inspector h2{font-size:24px;letter-spacing:-.045em;line-height:1.2;margin:10px 0 4px;font-weight:650}.calculation-state{font-size:12px;color:var(--muted)}
.param-facts{display:grid;gap:10px;margin-top:16px}.fact{display:flex;justify-content:space-between;align-items:baseline;gap:10px;padding:11px;background:#f3f6f0;border-radius:10px}.fact span{font-size:12px;color:var(--muted)}.fact strong{font-size:17px;font-weight:650;letter-spacing:-.02em;overflow-wrap:anywhere;text-align:right}
.explore-note{font-size:12px;color:var(--muted);line-height:1.55;margin:14px 0 0;padding-top:12px;border-top:1px solid var(--line)}
.before-after{display:grid;gap:8px;margin-top:16px;padding:13px;border:1px dashed #bacab0;border-radius:14px;background:#f6f8f1}.before-after .eyebrow{color:var(--muted);font-size:9px}.ba-row{display:flex;justify-content:space-between;gap:10px;font-size:13px}.ba-row strong{font-weight:650;overflow-wrap:anywhere;text-align:right}
.model-note{display:flex;align-items:center;gap:13px;margin-top:23px;color:var(--muted)}.model-mark{width:33px;height:33px;display:grid;place-items:center;border:1px solid var(--line);border-radius:11px;font-size:20px;color:var(--ink);flex-shrink:0}.model-note p{font-size:12px;line-height:1.6;margin:0}.details{border-top:1px solid var(--line);margin-top:18px;padding-top:14px;color:var(--muted);font-size:13px}.details summary{cursor:pointer;color:var(--ink);font-weight:500;min-height:32px}.details p{max-width:70ch;line-height:1.7}
@media(min-width:800px){.workspace{grid-template-columns:minmax(0,1.4fr) minmax(300px,1fr);align-items:start}.network-surface{padding-top:36px;padding-bottom:20px}.net{gap:76px 24px}.inspector{margin-top:0}.steps{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:679px){.heading{margin-bottom:20px}.heading h1{max-width:16ch}.network-surface{padding:21px 15px 13px}.net{grid-template-columns:repeat(2,minmax(0,1fr));grid-template-rows:76px 76px 86px;gap:40px 44px}.node{width:100px;height:76px;border-radius:19px}.node-value{font-size:22px}.node-name{font-size:12px}.output-node{grid-column:1/3;height:86px;width:112px}.node.pending .node-value{font-size:12px}#node-x1{grid-area:1/1}#node-x2{grid-area:1/2}#node-h1{grid-area:2/1}#node-h2{grid-area:2/2}#node-y{grid-area:3/1/4/3}.legend{gap:10px;font-size:10px;margin-top:17px}.steps li{font-size:11px;gap:5px}.inspector{padding:18px}.workspace{gap:20px}.result-grid{padding:10px}.result strong{font-size:19px}.control-row{gap:8px}.control>span{font-size:12px}.heading p{font-size:14px}.play-controls{grid-template-columns:minmax(0,1.18fr) minmax(0,1fr) 44px;gap:6px;margin-top:12px}.play-controls button{min-width:0;white-space:normal;font-size:12px;line-height:1.25;padding:8px;gap:5px}.play-controls .primary>span{min-width:0}.hint{margin:8px 0 12px}.fact{padding:9px}.fact strong{font-size:15px}.experience{padding:16px}.heading{margin-bottom:16px}h1{font-size:25px;margin:12px 0 10px}.stage-label{margin:10px 0 6px;min-height:44px;font-size:13px}.network-surface{padding:18px 14px 12px}.net{grid-template-rows:72px 72px 80px;gap:30px 22px}.model-note{margin-top:16px}.model-note p{font-size:11px}.details{margin-top:14px;padding-top:12px}}
@media(max-width:359px){.node{width:94px;height:74px}.output-node{width:102px;height:80px}.node-value{font-size:20px}.output-node .node-value{font-size:22px}.result-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.play-controls{grid-template-columns:minmax(0,1fr) minmax(0,1fr) 40px}.steps{gap:6px 8px}.steps li{font-size:10px;padding-bottom:6px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}.flow-dot,.node-grad{filter:none}}