@font-face{font-family:"Inter";src:url("inter-var-latin.woff2") format("woff2-variations"),url("inter-var-latin.woff2") format("woff2");font-weight:100 900;font-style:normal;font-display:swap}
:root{--ink:#0A0A0C;--paper:#F4F4F4;--white:#FFFFFF;--red:#D5122B;--grey-label:#8A8A90;--grey-body:#A9A9AF;--text-2:#45454B;--text-3:#66666C;--rule-light:#D9D9DD;--rule-dark:#26262B;--maxw:1200px;--gutter:clamp(20px,5vw,64px)}
*,*::before,*::after{box-sizing:border-box}
*{margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{font-family:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;font-optical-sizing:auto;font-size:18px;line-height:1.6;color:var(--ink);background:var(--white);-webkit-font-smoothing:antialiased}
a{color:inherit}
h1,h2,h3{text-wrap:balance}
:focus-visible{outline:2px solid var(--red);outline-offset:3px;border-radius:2px}
.wrap{max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.skip{position:absolute;left:var(--gutter);top:-60px;z-index:20;background:var(--paper);color:var(--ink);padding:10px 14px;font-size:15px;text-decoration:none}
.skip:focus{top:12px}

/* wordmark: red bold X, regular Laboratory */
.wordmark{display:inline-flex;align-items:baseline;gap:.22em;text-decoration:none;white-space:nowrap;line-height:1}
.wordmark .x{color:var(--red);font-weight:700;letter-spacing:.01em}
.wordmark .rest{font-weight:400;letter-spacing:-.012em}
.xn{color:var(--red);font-weight:700}

.site-head{background:var(--ink);color:var(--paper)}
.site-head .wrap{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:84px}
.site-head .wordmark{font-size:23px;color:var(--paper)}
.site-nav{display:flex;gap:clamp(16px,3vw,36px)}
.site-nav a{color:var(--grey-body);text-decoration:none;font-size:15px;font-weight:450}
.site-nav a:hover{color:var(--paper)}

.hero{background:var(--ink);color:var(--paper);padding:clamp(56px,9vw,120px) 0 clamp(56px,7vw,96px);overflow:hidden}
.hero h1{font-size:clamp(46px,8.6vw,112px);font-weight:640;letter-spacing:-.045em;line-height:.96;max-width:11em}
.hero .lead{margin-top:clamp(24px,3vw,36px);max-width:34em;font-size:clamp(18px,2.1vw,22px);line-height:1.55;color:var(--grey-body)}
.btn{display:inline-block;margin-top:36px;padding:15px 24px 16px;background:var(--paper);color:var(--ink);font-size:16px;font-weight:600;text-decoration:none;border-radius:3px}
.btn:hover{background:var(--white)}

/* the chain: one line, four stations, the record made at the third */
.chain{list-style:none;position:relative;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));margin-top:clamp(64px,9vw,112px);padding-top:40px}
.chain::before{content:"";position:absolute;left:0;right:calc(50% - 50vw);top:20px;height:1px;background:#4A4A52;transform-origin:left center;animation:draw 1.3s cubic-bezier(.2,.7,.2,1) .25s both}
.chain li{position:relative;padding-right:16px}
.chain li::before{content:"";position:absolute;left:0;top:-24px;width:9px;height:9px;border-radius:50%;background:var(--grey-label)}
.chain .lbl{display:block;font-size:16px;line-height:1.4;color:var(--grey-body)}
.chain .x::before{display:none}
.chain .mark{position:absolute;left:-13px;top:-45px;font-size:52px;font-weight:700;line-height:1;color:var(--red);animation:land .5s cubic-bezier(.2,.7,.2,1) 1.15s both}
.chain .x .lbl{color:var(--paper);font-weight:600}
.chain .x .sub{display:block;margin-top:4px;font-weight:400;color:var(--grey-body)}
.chain-note{margin-top:36px;font-size:16px;color:var(--grey-label)}
@keyframes draw{from{transform:scaleX(0)}to{transform:scaleX(1)}}
@keyframes land{from{opacity:0;transform:scale(.55)}to{opacity:1;transform:scale(1)}}
@media (prefers-reduced-motion:reduce){.chain::before,.chain .mark{animation:none}}

.section{padding:clamp(72px,10vw,136px) 0}
.on-paper{background:var(--paper)}
.on-white{background:var(--white)}
.section h2{font-size:clamp(32px,4.6vw,54px);font-weight:620;letter-spacing:-.032em;line-height:1.06;max-width:16em}
.section p{color:var(--text-2)}
.split{display:grid;grid-template-columns:5fr 6fr;gap:clamp(32px,6vw,96px);align-items:start}
.split p{font-size:clamp(18px,1.7vw,20px);line-height:1.65;max-width:34em}
.split p+p{margin-top:1em}

/* four layers of the chain: hairline-separated columns, no cards */
.layers{display:grid;grid-template-columns:repeat(4,1fr);margin-top:clamp(40px,6vw,72px);border-top:1px solid var(--ink)}
.layer{padding:28px clamp(16px,2.5vw,36px) 0 0}
.layer+.layer{padding-left:clamp(16px,2.5vw,36px);border-left:1px solid var(--rule-light)}
.layer h3{font-size:clamp(20px,2vw,24px);font-weight:620;letter-spacing:-.018em;line-height:1.2}
.layer p{margin-top:12px;font-size:17px;line-height:1.6;max-width:26em}
.layer .when{display:block;margin-top:14px;font-size:14px;color:var(--grey-label)}

/* temperature ladder */
.ladder{margin-top:clamp(40px,6vw,72px)}
.ladder svg{width:100%;height:auto;display:block}
.ladder figcaption{margin-top:20px;font-size:16px;line-height:1.6;color:var(--text-3);max-width:44em}

.where{display:grid;grid-template-columns:1fr 1fr;gap:clamp(32px,6vw,96px);margin-top:clamp(40px,6vw,72px)}
.where h3{font-size:clamp(22px,2.4vw,28px);font-weight:620;letter-spacing:-.02em;line-height:1.2}
.where p{margin-top:14px;font-size:18px;line-height:1.65;max-width:32em}
.where ul{margin-top:14px;padding-left:1.1em;color:var(--text-2);font-size:18px;line-height:1.65}
.where li+li{margin-top:6px}

.contact{background:var(--ink);color:var(--paper);padding:clamp(72px,10vw,128px) 0}
.contact h2{font-size:clamp(32px,4.6vw,54px);font-weight:620;letter-spacing:-.032em;line-height:1.06}
.contact p{margin-top:20px;max-width:34em;font-size:clamp(18px,1.7vw,20px);color:var(--grey-body)}
.contact .mail{display:inline-block;margin-top:28px;font-size:clamp(22px,3vw,34px);font-weight:600;letter-spacing:-.02em;color:var(--paper);text-decoration:none;border-bottom:2px solid var(--red);padding-bottom:4px}
.contact .who{margin-top:28px;font-size:16px;color:var(--grey-label)}

.site-foot{background:var(--ink);color:var(--grey-body);border-top:1px solid var(--rule-dark);padding:40px 0 48px;font-size:15px}
.site-foot .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:24px 40px;align-items:flex-start}
.site-foot .wordmark{font-size:20px;color:var(--paper)}
.site-foot nav{display:flex;flex-wrap:wrap;gap:18px 28px}
.site-foot nav a{color:var(--grey-body);text-decoration:none}
.site-foot nav a:hover{color:var(--paper)}
.site-foot .legal{width:100%;color:var(--grey-label);font-size:14px;line-height:1.6}
.site-foot .legal p+p{margin-top:4px}

@media (max-width:900px){
  .split,.where{grid-template-columns:1fr}
  .layers{grid-template-columns:1fr 1fr}
  .layer:nth-child(3){padding-left:0;border-left:0;border-top:1px solid var(--rule-light);margin-top:24px}
  .layer:nth-child(4){border-top:1px solid var(--rule-light);margin-top:24px}
}
@media (max-width:640px){
  .site-nav{display:none}
  .chain{grid-template-columns:1fr 1fr;row-gap:44px}
  .chain li:nth-child(n+3)::before{display:none}
  .chain li:nth-child(n+3){padding-top:0}
  .chain .mark{font-size:44px;top:-40px}
  .layers{grid-template-columns:1fr}
  .layer+.layer{padding-left:0;border-left:0;border-top:1px solid var(--rule-light);margin-top:24px}
}

/* ladder geometry: label column + track scaled 0–4,000 °C */
.ladder .band{position:relative;margin-left:clamp(0px,26%,300px);height:56px}
.ladder .band .bmark{position:absolute;left:calc(30% - 13px);top:-6px;font-size:52px;font-weight:700;line-height:1;color:var(--red)}
.ladder .band .btext{position:absolute;left:calc(30% + 34px);top:14px;font-size:15px;font-weight:600;color:var(--red);white-space:nowrap}
.ladder .band::after{content:"";position:absolute;left:30%;right:40%;top:50px;height:2px;background:var(--red)}
.ladder .rows{border-top:1px solid var(--ink)}
.ladder .row{display:grid;grid-template-columns:clamp(0px,26%,300px) 1fr;align-items:center;min-height:52px;border-bottom:1px solid var(--rule-light)}
.ladder .lab{font-size:15px;line-height:1.35;color:var(--text-2);padding:10px 16px 10px 0}
.ladder .track{position:relative;height:52px}
.ladder .bar{position:absolute;left:0;top:19px;height:14px}
.ladder .bar.metal{background:var(--rule-light)}
.ladder .bar.ink{background:var(--ink)}
.ladder .bar.thin{top:31px;height:2px;background:var(--text-3)}
.ladder .val{position:absolute;top:15px;margin-left:10px;font-size:14px;font-weight:500;color:var(--text-3);white-space:nowrap}
.w1100{width:27.5%}.w1600{width:40%}.w2400{width:60%}.w3900{width:97.5%}
.v1100{left:27.5%}.v1600{left:40%}.v2400{left:60%}.ladder .v3900{left:97.5%;margin-left:0;transform:translateX(-100%);top:6px}
.ladder .axis{position:relative;margin-left:clamp(0px,26%,300px);height:26px;border-top:1px solid var(--ink)}
.ladder .axis span{position:absolute;top:6px;font-size:13px;color:var(--grey-label);transform:translateX(-50%);white-space:nowrap}
.ladder .axis span:nth-child(1){left:0;transform:none}
.ladder .axis span:nth-child(2){left:25%}
.ladder .axis span:nth-child(3){left:50%}
.ladder .axis span:nth-child(4){left:75%}
.ladder .axis span:nth-child(5){left:100%;transform:translateX(-100%)}
@media (max-width:640px){
  .ladder .row{grid-template-columns:1fr;min-height:0;padding:10px 0 6px}
  .ladder .lab{padding:0 0 4px}
  .ladder .track{height:36px}
  .ladder .bar{top:11px}.ladder .bar.thin{top:24px}
  .ladder .val{top:7px}
  .ladder .band,.ladder .axis{margin-left:0}
  .ladder .band .btext{font-size:13px}
}