‘+
‘

‘;
s.addEventListener(‘click’,function(){ select(i); });
s.addEventListener(‘mouseenter’,function(){ select(i); });
ladderEl.appendChild(s); nodes.push(s);
});
var readout=document.getElementById(‘readout’);
function select(i){
nodes.forEach(function(n,j){ n.classList.toggle(‘sel’,j===i); });
var m=milestones[i];
readout.innerHTML=’

‘+
‘

‘;
}
select(3);

// Compute / gigawatts data
var gws=[
[‘SpaceX Colossus 1+2′,’live now’,300,’live’],
[‘Amazon AWS’,’5 GW · 1 GW by end of 2026′,5000,’soon’],
[‘Google + Broadcom’,’5 GW TPU · 2027+’,5000,’long’],
[‘Microsoft + Nvidia’,’$30B Azure’,null,’soon’],
[‘Fluidstack’,’$50B US AI infrastructure’,null,’long’]
];
var gwLinesEl=document.getElementById(‘gwlines’);
// bar widths: live = 6%, soon/AWS = 50%, soon/Azure (no MW) = 35%, long/G+B = 50%, long/FS = 40%
var widths={live:6,soon:50,soonAzure:35,long:50,longFS:40};
gws.forEach(function(g,i){
var row=document.createElement(‘div’); row.className=’gwline ‘+g[3];
var labelExt = g[0].indexOf(‘Azure’)>-1 || g[0].indexOf(‘Microsoft’)>-1 ? ‘Azure’ : ”;
var w = (g[3]===’soon’ && labelExt===’Azure’) ? widths.soonAzure :
(g[3]===’long’ && g[0].indexOf(‘Fluid’)>-1) ? widths.longFS :
widths[g[3]];
var rightLabel = g[2] ? (g[2]>=1000? (g[2]/1000).toFixed(g[2]/1000===Math.floor(g[2]/1000)?0:1)+’ GW’ : g[2]+’ MW’) : (g[3]===’soon’?’$30B’:’$50B’);
row.innerHTML=’

‘+
‘

‘+
‘

‘;
gwLinesEl.appendChild(row);
});

function fillLadder(){
nodes.forEach(function(n,i){
var bar=n.querySelector(‘.bar’), val=n.querySelector(‘.val’);
var h=bar.getAttribute(‘data-h’);
if(reduce){ bar.style.height=h+’%’; val.classList.add(‘in’); }
else{ setTimeout(function(){ bar.style.height=h+’%’;
setTimeout(function(){ val.classList.add(‘in’); },800);
},120+i*180); }
});
}
function fillGW(){
gwLinesEl.querySelectorAll(‘.gwt i’).forEach(function(b,i){
var w=b.getAttribute(‘data-w’);
if(reduce)b.style.width=w+’%’; else setTimeout(function(){b.style.width=w+’%’;},150+i*120);
});
}

var seen=new WeakSet();
var io=new IntersectionObserver(function(es){
es.forEach(function(en){ if(en.isIntersecting){ en.target.classList.add(‘in’);
var sec=en.target.closest(‘section’);
if(sec && !seen.has(sec)){ seen.add(sec);
if(sec.querySelector(‘.ladder’))fillLadder();
if(sec.querySelector(‘#gwlines’))fillGW();
}
}});
},{threshold:.16});
root.querySelectorAll(‘.rv’).forEach(function(el){ if(reduce)el.classList.add(‘in’); else io.observe(el); });

// auto-demo: cycle the ladder once
var demoed=false;
var ioDemo=new IntersectionObserver(function(es){
es.forEach(function(en){ if(en.isIntersecting && !demoed){ demoed=true;
if(!reduce){
setTimeout(function(){ select(0); },1800);
setTimeout(function(){ select(1); },2400);
setTimeout(function(){ select(2); },3000);
setTimeout(function(){ select(3); },3600);
}
ioDemo.disconnect();
}});
},{threshold:.5});
if(!reduce)ioDemo.observe(document.querySelector(‘.traj’));
})();