.bdh-page{--blue:#00c;--visited:#551a8b;--rule:#999;--light-rule:#ccc;--paper:#fff;--note:#f5f5e9;background:var(--paper);color:#111;max-width:960px;margin:0 auto;padding:0 18px 60px;font:16px/1.45 Georgia,Times New Roman,Times,serif}.bdh-page *{box-sizing:border-box}.bdh-page a{color:var(--blue);text-decoration:underline}.bdh-page a:visited{color:var(--visited)}.bdh-page p{margin:.7em 0 1em}.bdh-topbar{border-bottom:1px solid #000;align-items:baseline;gap:22px;padding:15px 0 8px;font-family:Arial,Helvetica,sans-serif;display:flex}.bdh-brand{font-size:18px;font-weight:700;color:#000!important;text-decoration:none!important}.bdh-brand>span{color:#900}.bdh-brand small{color:#555;font:11px Arial,sans-serif}.bdh-topbar nav{gap:13px;margin-left:auto;display:flex}.bdh-topbar nav a,.top-paper{font:12px Arial,sans-serif}.top-paper{white-space:nowrap}.hero{border-bottom:0;grid-template-columns:minmax(0,1fr) 230px;gap:28px;min-height:0;padding:42px 0 20px;display:grid}.hero-copy{padding:0}.eyebrow,.chapter-no,.visual-label{color:#555;letter-spacing:.03em;text-transform:uppercase;font:700 11px Arial,Helvetica,sans-serif}.hero h1{letter-spacing:0;margin:10px 0 14px;font:700 34px/1.15 Arial,Helvetica,sans-serif}.hero h1 i{color:inherit;font-family:Georgia,serif;font-weight:400}.dek{color:#222;max-width:650px;font-size:18px;line-height:1.5}.hero-actions{margin-top:18px;font:13px Arial,sans-serif;display:block}.hero-actions a{margin-right:16px}.hero-actions .primary{color:var(--blue);background:0 0;padding:0}.hero-visual{border:1px solid var(--rule);background:var(--note);padding:9px 12px 12px}.visual-label{margin:0 0 7px}.visual-note{color:#444;font:11px/1.4 Arial,sans-serif}.model-card{border-top:1px solid #000;border-bottom:1px solid #000;padding:8px 0}.model-card>span{font:700 12px Courier New,monospace}.model-card>strong{margin:5px 0 0;font:700 34px Arial,sans-serif;display:block}.model-card>small{text-transform:uppercase;font:10px Arial,sans-serif}.loss-line{display:none}.model-card dl{grid-template-columns:1fr 1fr;margin:10px 0 0;display:grid}.model-card dl div+div{border-left:1px solid var(--rule);padding-left:10px}.model-card dt{font:700 16px Arial,sans-serif}.model-card dd{text-transform:uppercase;margin:0;font:9px Arial,sans-serif}.hero-stats{border-collapse:collapse;border-top:1px solid #000;border-bottom:1px solid #000;grid-column:1/-1;width:100%;margin:18px 0 0;display:table}.hero-stats div{border-right:1px solid var(--light-rule);width:25%;padding:7px 10px;display:table-cell}.hero-stats div:last-child{border-right:0}.hero-stats dt{font:700 14px Arial,sans-serif}.hero-stats dd{text-transform:uppercase;margin:1px 0 0;font:10px Arial,sans-serif}.reading-grid{padding:20px 0 0;display:block}.toc{border:1px solid var(--rule);background:#f7f7f7;padding:9px 12px;font-family:Arial,Helvetica,sans-serif;position:static}.toc p{margin:0 8px 0 0;font-size:12px;font-weight:700;display:inline}.toc a{padding:0;font-size:12px;display:inline}.toc a+a:before{content:" | ";color:#777;text-decoration:none}.story{max-width:780px}.chapter{padding:30px 0 10px;scroll-margin-top:10px}.chapter-no{color:#333}.chapter-no:after{display:none}.chapter h2{letter-spacing:0;border-bottom:1px solid #000;margin:3px 0 14px;padding-bottom:3px;font:700 24px/1.25 Arial,Helvetica,sans-serif}.chapter>p{color:#111;max-width:none;font-size:16px;line-height:1.5}.chapter .lead{color:#111;font-size:17px;line-height:1.5}.bdh-ref{vertical-align:super;font:10px Arial,sans-serif}.result-strip,.three-up,.arc-readout{border-collapse:collapse;border-top:1px solid #000;border-bottom:1px solid #000;width:100%;margin:16px 0;display:table}.result-strip>div,.three-up>div,.arc-readout>div{border-right:1px solid var(--light-rule);width:33.333%;padding:8px 10px;display:table-cell}.result-strip>div:last-child,.three-up>div:last-child,.arc-readout>div:last-child{border-right:0}.result-strip span,.finding span,.three-up span,.arc-readout span{text-transform:uppercase;font:700 10px Arial,sans-serif}.result-strip b,.three-up b,.arc-readout b{margin:2px 0;font:700 18px Arial,sans-serif;display:block}.result-strip p,.three-up p,.arc-readout p{margin:3px 0;font:12px/1.4 Arial,sans-serif}.finding{border-top:1px dotted var(--rule);grid-template-columns:150px 1fr;padding:8px 0;display:grid}.finding p{margin:0;font-size:14px}.finding.muted{color:#444}.artifact-link{border:1px solid var(--rule);background:#f7f7f7;margin-top:8px;padding:7px 9px;font:12px Arial,sans-serif;display:inline-block}.artifact-link span:before{content:" — ";color:#000}.duality{border-collapse:collapse;width:100%;margin:16px 0;display:table}.duality>div{border:1px solid var(--rule);vertical-align:top;width:48%;padding:9px 11px;display:table-cell}.duality>b{text-align:center;width:4%;display:table-cell}.duality span,.equations span{font:700 10px Arial,sans-serif}.duality h3{margin:3px 0;font:700 18px Arial,sans-serif}.duality p{margin:4px 0;font-size:14px}.callout{border:1px solid var(--rule);background:var(--note);margin:14px 0;padding:9px 12px}.callout>b{text-transform:uppercase;font:700 11px Arial,sans-serif}.callout p{margin-bottom:2px}.architecture{align-items:center;gap:5px;margin:16px 0;font-family:Arial,sans-serif;display:flex}.arch-node{border:1px solid var(--rule);flex-direction:column;flex:1;justify-content:center;min-height:70px;padding:7px;display:flex}.arch-node small{text-transform:uppercase;margin-bottom:4px;font-size:9px}.arch-node strong{font:700 11px Courier New,monospace}.arch-stack{flex:1.4;gap:3px;display:grid}.arch-stack .arch-node{min-height:47px;padding-left:28px;position:relative}.arch-stack span{font-size:9px;position:absolute;top:7px;left:7px}.arch-stack em{font-size:9px}.arch-stack .memory{background:var(--note);border-color:#777}.arch-arrow{flex:0}.equations{color:#000;background:#f8f8f8;border:1px solid #777;margin:14px 0 0;padding:10px;overflow:auto}.equations p{white-space:nowrap;margin:2px 0;font:12px/1.6 Courier New,monospace}.equations span{width:130px;display:inline-block}.caption,.arc-chart figcaption{color:#444!important;font:11px/1.4 Arial,sans-serif!important}.memory-sequence{border-collapse:collapse;text-align:center;width:100%;margin:15px 0;display:table}.memory-sequence>div{border:1px solid var(--rule);padding:8px;display:table-cell}.memory-sequence>b{padding:0 6px;display:table-cell}.memory-sequence span{font:700 10px Arial,sans-serif}.memory-sequence i{margin:7px 0;font:16px Courier New,monospace;display:block}.memory-sequence p{text-transform:uppercase;margin:2px 0;font:10px Arial,sans-serif}.memory-sequence .hot{background:var(--note)}.comparison{border-top:2px solid #000;border-bottom:2px solid #000;width:100%}.comparison>div{border-bottom:1px solid var(--light-rule);grid-template-columns:1fr 1.35fr 1.35fr;display:grid}.comparison>div:last-child{border-bottom:0}.comparison span,.comparison b{padding:6px 8px;font:12px Arial,sans-serif}.comparison b{border-left:1px solid var(--light-rule);font-weight:400}.comparison .head span,.comparison .head b{font-weight:700}.arc-chart{margin:16px 0}.arc-chart img{border:1px solid var(--rule);width:100%;height:auto;display:block}.arc-chart figcaption{margin-top:5px}.evidence-list{border-top:2px solid #000}.evidence-list>div{border-bottom:1px solid var(--light-rule);padding:10px 100px 10px 0;position:relative}.evidence-list h3{margin:0 0 2px;font:700 16px Arial,sans-serif}.evidence-list p{margin:2px 0;font-size:14px}.evidence-list small{color:#444;font:10px Arial,sans-serif}.status{border:1px solid var(--rule);padding:2px 4px;font:9px Arial,sans-serif;position:absolute;top:11px;right:0}.supported{color:#060}.interpret-list{padding-left:24px}.interpret-list li{padding:4px 0}.interpret-list li:before{display:none}.interpret-list b{font-family:Arial,sans-serif}.interpret-list p{margin:2px 0}.limits-grid{border-top:1px solid #000;grid-template-columns:1fr 1fr;display:grid}.limits-grid>div{border-bottom:1px solid var(--light-rule);min-height:0;padding:10px 14px 10px 0}.limits-grid>div:nth-child(2n){border-left:1px solid var(--light-rule);padding-left:14px}.limits-grid span{font:700 10px Arial,sans-serif}.limits-grid h3{margin:2px 0 4px;font:700 15px Arial,sans-serif}.limits-grid p{margin:0;font-size:13px}.resources>a{border-bottom:1px dotted var(--rule);grid-template-columns:32px 1fr auto;padding:7px 0;display:grid}.resources>a>span,.resources>a>i{font:10px Arial,sans-serif}.resources b{font-family:Arial,sans-serif;font-size:14px}.resources p{margin:1px 0;font-size:12px}.resources details{border-top:1px solid #000;border-bottom:1px solid #000;margin-top:14px;padding:8px 0}.resources summary{cursor:pointer;font:700 12px Arial,sans-serif}.resources li{margin:4px 0}.bdh-footer{color:#444;border-top:1px solid #000;margin-top:25px;padding-top:8px;font:11px/1.4 Arial,sans-serif}@media (max-width:700px){.bdh-page{padding:0 12px 40px;font-size:15px}.bdh-topbar nav{display:none}.hero{padding-top:28px;display:block}.hero h1{font-size:30px}.hero-visual{margin-top:20px}.hero-stats,.result-strip,.three-up,.arc-readout{display:block}.hero-stats div,.result-strip>div,.three-up>div,.arc-readout>div{border-right:0;border-bottom:1px solid var(--light-rule);width:100%;display:block}.toc a{line-height:1.8}.finding{grid-template-columns:1fr;gap:4px}.duality,.duality>div,.duality>b{width:100%;display:block}.duality>b{padding:4px}.architecture{display:block}.arch-arrow{text-align:center;padding:3px;transform:rotate(90deg)}.memory-sequence{display:block}.memory-sequence>div,.memory-sequence>b{width:100%;display:block}.memory-sequence>b{transform:rotate(90deg)}.comparison{overflow-x:auto}.comparison>div{min-width:560px}.limits-grid{grid-template-columns:1fr}.limits-grid>div:nth-child(2n){border-left:0;padding-left:0}}