:root{
  --ink:#141416;
  --ink-2:#3b3b40;
  --muted:#76767d;
  --line:#e4e4e6;
  --line-2:#d0d0d4;
  --bg:#ffffff;
  --bg-2:#f6f6f5;
  --max:1160px;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{font-family:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6;font-size:17px;-webkit-font-smoothing:antialiased}
a{color:inherit}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px;position:relative}

/* Header */
.hdr{position:sticky;top:0;z-index:50;background:#fff;border-bottom:1px solid var(--line)}
.hdr .wrap{display:flex;align-items:center;justify-content:space-between;height:68px;gap:20px}
.brand img{height:40px;width:auto;display:block}
.nav{display:flex;align-items:center;gap:26px}
.nav a{text-decoration:none;font-size:14.5px;color:var(--ink-2)}
.nav a:hover{color:var(--ink);text-decoration:underline;text-underline-offset:6px;text-decoration-thickness:1px}
.nav .lang{font-family:var(--mono);font-size:13px;border:1px solid var(--line-2);padding:3px 10px}
.burger{display:none;background:none;border:0;width:40px;height:40px;cursor:pointer}
.burger span,.burger span::before,.burger span::after{display:block;width:22px;height:1.5px;background:var(--ink);position:relative;margin:auto;content:""}
.burger span::before{position:absolute;top:-7px}
.burger span::after{position:absolute;top:7px}

/* Decorative engineering drawings */
.drawing{position:absolute;pointer-events:none;color:var(--ink)}
.drawing svg{width:100%;height:auto;display:block}
.drawing text{font-family:var(--mono);font-size:11px;fill:currentColor;stroke:none}

/* Hero */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line);
  background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:48px 48px}
.hero::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,#fff 32%,rgba(255,255,255,.72) 62%,rgba(255,255,255,.5))}
.hero .wrap{padding:108px 24px 84px}
.hero .drawing{right:-150px;top:40px;width:720px;opacity:.28}
.hero-text{position:relative;max-width:600px}
.eyebrow{font-family:var(--mono);font-size:12.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.hero h1{font-size:clamp(32px,4.2vw,48px);line-height:1.12;font-weight:600;letter-spacing:-.015em;margin:18px 0 22px}
.hero p{font-size:19px;color:var(--ink-2);max-width:580px}
.cta{margin-top:34px;display:flex;flex-wrap:wrap;gap:12px}
.btn{display:inline-block;padding:13px 24px;font:inherit;font-size:15px;font-weight:500;text-decoration:none;border:1px solid var(--ink);cursor:pointer;transition:background .15s,color .15s}
.btn-dark{background:var(--ink);color:#fff}
.btn-dark:hover{background:#000}
.btn-line{color:var(--ink);background:#fff}
.btn-line:hover{background:var(--ink);color:#fff}
.facts{position:relative;display:flex;flex-wrap:wrap;margin-top:48px;border-top:1px solid var(--line-2);max-width:760px}
.fact{padding:18px 48px 0 0}
.fact b{display:block;font-family:var(--mono);font-weight:500;font-size:21px}
.fact span{font-size:14px;color:var(--muted)}

/* Sections */
section{padding:104px 0;position:relative;overflow:hidden}
.alt{background:var(--bg-2)}
.sec-head{display:grid;grid-template-columns:200px 1fr;gap:32px;margin-bottom:52px;position:relative}
.num{font-family:var(--mono);font-size:13px;color:var(--muted);padding-top:12px;border-top:1px solid var(--ink);align-self:start}
h2{font-size:clamp(28px,3.3vw,40px);line-height:1.15;font-weight:600;letter-spacing:-.01em}
.lead{margin-top:14px;font-size:18.5px;color:var(--ink-2);max-width:720px}
.body{margin-left:232px;position:relative}
section .drawing.bgd{right:-220px;bottom:-60px;width:640px;opacity:.09}

/* Consulting rows */
.rows{border-top:1px solid var(--line-2)}
.row{display:grid;grid-template-columns:60px 1fr 1.35fr;gap:24px;padding:24px 0;border-bottom:1px solid var(--line-2);align-items:baseline}
.row .i{font-family:var(--mono);font-size:13px;color:var(--muted)}
.row h3{font-size:18px;font-weight:600;line-height:1.35}
.row p{font-size:15.5px;color:var(--ink-2)}

/* EE measures */
.ee{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line-2);border-left:1px solid var(--line-2);background:rgba(255,255,255,.75)}
.m{padding:22px 22px 26px;border-right:1px solid var(--line-2);border-bottom:1px solid var(--line-2)}
.m .i{font-family:var(--mono);font-size:12.5px;color:var(--muted);display:block;margin-bottom:14px}
.m h3{font-size:16px;font-weight:600;margin-bottom:6px;line-height:1.35}
.m p{font-size:14.5px;color:var(--muted)}
.ee-note{margin-top:28px;font-size:16px;color:var(--ink-2);max-width:760px;padding-left:16px;border-left:1px solid var(--ink)}

/* Process */
.steps{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--ink)}
.step{padding:22px 28px 0 0}
.step .i{font-family:var(--mono);font-size:13px;color:var(--muted)}
.step h3{font-size:17px;font-weight:600;margin:10px 0 6px}
.step p{font-size:15px;color:var(--ink-2)}

/* Design disciplines */
.disc{display:grid;grid-template-columns:1fr 1fr;gap:0 48px;border-top:1px solid var(--line-2)}
.d{padding:18px 0;border-bottom:1px solid var(--line-2)}
.d h3{font-size:16.5px;font-weight:600}
.d p{font-size:15px;color:var(--muted);margin-top:2px}

/* Sectors */
.sectors{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}
.sector{border-top:1px solid var(--ink);padding-top:18px}
.sector h3{font-size:18px;font-weight:600;margin-bottom:6px}
.sector p{font-size:15.5px;color:var(--ink-2)}
.about{margin-top:64px}
.about p{color:var(--ink-2);max-width:760px}
.about p+p{margin-top:16px}

/* Projects */
.filters{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:28px}
.filters button{font:inherit;font-size:13.5px;border:1px solid var(--line-2);background:#fff;color:var(--ink-2);padding:6px 13px;cursor:pointer}
.filters button[aria-pressed="true"]{background:var(--ink);border-color:var(--ink);color:#fff}
.filters .n{font-family:var(--mono);font-size:12px;opacity:.6;margin-left:4px}
.plist{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:0 48px;border-top:1px solid var(--line-2)}
.plist li{padding:12px 0;border-bottom:1px solid var(--line-2);font-size:15.5px}
.plist li[hidden]{display:none}
.plist .pl{color:var(--muted);font-size:13.5px;display:block}
.more-btn{margin-top:28px}
.more{margin-top:20px;color:var(--muted);font-size:15px}

/* Contacts */
.contact-grid{display:grid;grid-template-columns:1fr 1.15fr;gap:48px}
.crow{padding:16px 0;border-bottom:1px solid var(--line-2)}
.crow:first-child{border-top:1px solid var(--line-2)}
.crow small{display:block;font-family:var(--mono);font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.06em;margin-bottom:2px}
.crow a,.crow span{font-size:17px;text-decoration:none}
.crow a:hover{text-decoration:underline;text-underline-offset:4px}
.person{margin-top:4px}
.person b{font-weight:600}
.person span{color:var(--muted);font-size:15px}
.map{border:1px solid var(--line-2);min-height:380px;background:var(--bg-2)}
.map iframe{width:100%;height:100%;min-height:380px;border:0;display:block;filter:grayscale(1) contrast(1.05)}

/* Footer */
footer{border-top:1px solid var(--line);padding:28px 0;font-size:13.5px;color:var(--muted)}
footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px}
footer a{text-decoration:none}

@media (max-width:1000px){
  .body{margin-left:0}
  .sec-head{grid-template-columns:1fr;gap:18px}
  .num{max-width:200px}
  .ee{grid-template-columns:1fr 1fr}
  .steps{grid-template-columns:1fr 1fr;gap:28px 0}
  .contact-grid{grid-template-columns:1fr}
  .hero .drawing{width:580px;right:-180px}
}
@media (max-width:760px){
  body{font-size:16px}
  .nav{position:fixed;top:68px;left:0;right:0;background:#fff;flex-direction:column;align-items:flex-start;gap:0;padding:4px 24px 16px;border-bottom:1px solid var(--line);display:none}
  .nav.open{display:flex}
  .nav a{padding:12px 0;width:100%;border-bottom:1px solid var(--line)}
  .nav .lang{border:0;border-bottom:1px solid var(--line);padding:12px 0}
  .burger{display:block}
  .brand img{height:30px}
  .hero .wrap{padding:60px 24px 52px}
  .hero .drawing{display:none}
  .hero::before{background:rgba(255,255,255,.8)}
  .facts{flex-direction:column;margin-top:44px}
  .fact{padding:14px 0;border-bottom:1px solid var(--line)}
  section{padding:68px 0}
  .row{grid-template-columns:1fr;gap:4px}
  .ee,.steps,.disc,.sectors,.plist{grid-template-columns:1fr}
  section .drawing.bgd{width:440px;right:-180px}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.btn{transition:none}}

/* ---------- Projects: cards ---------- */
#projects .filters{margin-bottom:36px}
.pgrid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:40px 28px}
.pcard{font:inherit;color:inherit;text-align:left;background:none;border:0;padding:0;cursor:pointer;display:flex;flex-direction:column;min-width:0}
.pcard[hidden]{display:none}
.pimg{position:relative;display:block;aspect-ratio:4/3;overflow:hidden;background:#e8e8e6}
.pimg img{width:100%;height:100%;object-fit:cover;display:block;filter:grayscale(1) contrast(1.03);transition:filter .6s ease,transform .9s cubic-bezier(.2,.7,.2,1)}
.pcard:hover .pimg img,.pcard:focus-visible .pimg img{filter:grayscale(0);transform:scale(1.035)}
.pimg.noimg{background-image:linear-gradient(var(--line-2) 1px,transparent 1px),linear-gradient(90deg,var(--line-2) 1px,transparent 1px);background-size:24px 24px}
.pcount{position:absolute;right:0;bottom:0;background:#fff;color:var(--ink);font-family:var(--mono);font-size:12px;padding:5px 9px;display:flex;gap:6px;align-items:center}
.pcount::before{content:"";width:12px;height:9px;border:1.2px solid currentColor;display:block}
.pmeta{display:flex;flex-direction:column;gap:3px;padding-top:14px;border-top:1px solid var(--ink);margin-top:14px}
.pcat{font-family:var(--mono);font-size:11.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.pmeta b{font-size:17px;font-weight:600;line-height:1.3;text-wrap:balance}
.ploc{font-size:14px;color:var(--muted)}
.pcard:focus-visible{outline:2px solid var(--ink);outline-offset:6px}
.pcard.in{animation:rise .5s cubic-bezier(.2,.7,.2,1) both}
@keyframes rise{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
.pmore-wrap{margin-top:40px;display:flex;justify-content:center}
.others{margin-top:88px}
.others-head{display:flex;align-items:baseline;gap:12px;margin-bottom:18px}
.others-head h3{font-size:22px;font-weight:600}
.mono-n{font-family:var(--mono);font-size:13px;color:var(--muted)}

/* ---------- Lightbox ---------- */
html.lb-open{overflow:hidden}
.lb{position:fixed;inset:0;z-index:100;background:rgba(17,17,19,.97);display:grid;grid-template-columns:minmax(0,1fr) 380px;opacity:0;transition:opacity .22s ease}
.lb.show{opacity:1}
.lb[hidden]{display:none}
.lb-stage{position:relative;display:grid;place-items:center;padding:48px 72px;min-height:0;min-width:0}
.lb-img{max-width:100%;max-height:calc(100vh - 96px);object-fit:contain;display:block;transition:opacity .28s ease}
.lb-img.fade{opacity:0}
.lb-nav{position:absolute;top:50%;transform:translateY(-50%);width:48px;height:48px;border:1px solid rgba(255,255,255,.28);background:transparent;color:#fff;font-size:20px;cursor:pointer;transition:background .15s}
.lb-nav:hover{background:rgba(255,255,255,.12)}
.lb-nav[hidden]{display:none}
.lb-prev{left:14px}.lb-next{right:14px}
.lb-info{background:#fff;color:var(--ink);padding:26px 28px;overflow:auto;display:flex;flex-direction:column;gap:12px}
.lb-top{display:flex;justify-content:space-between;align-items:center}
.lb-count{font-family:var(--mono);font-size:13px;color:var(--muted)}
.lb-close{border:1px solid var(--line-2);background:#fff;width:40px;height:40px;cursor:pointer;font-size:15px;color:var(--ink)}
.lb-close:hover{background:var(--ink);color:#fff}
.lb-cat{font-family:var(--mono);font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-top:8px}
.lb-title{font-size:23px;line-height:1.25;font-weight:600;text-wrap:balance}
.lb-dl{border-top:1px solid var(--line-2);margin-top:6px}
.lb-dl dt{font-family:var(--mono);font-size:11.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-top:14px}
.lb-dl dd{font-size:15.5px;margin-top:2px}
.lb-thumbs{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;margin-top:12px}
.lb-thumbs[hidden]{display:none}
.lb-thumbs button{padding:0;border:0;background:#eee;aspect-ratio:1;cursor:pointer;overflow:hidden;outline-offset:2px}
.lb-thumbs img{width:100%;height:100%;object-fit:cover;display:block;filter:grayscale(1);opacity:.7;transition:filter .3s,opacity .3s}
.lb-thumbs button:hover img,.lb-thumbs button[aria-current="true"] img{filter:none;opacity:1}
.lb-thumbs button[aria-current="true"]{outline:2px solid var(--ink)}
.lb-pn{display:flex;justify-content:space-between;border-top:1px solid var(--line-2);padding-top:14px;margin-top:auto}
.lb-pn button{font:inherit;font-size:14px;background:none;border:0;cursor:pointer;color:var(--ink-2);padding:6px 0}
.lb-pn button:hover{color:var(--ink);text-decoration:underline;text-underline-offset:4px}

@media (max-width:1000px){.pgrid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:900px){
  .lb{grid-template-columns:1fr;grid-template-rows:minmax(0,1fr) auto}
  .lb-stage{padding:16px 12px}
  .lb-img{max-height:52vh}
  .lb-info{max-height:46vh;padding:18px 20px}
  .lb-nav{width:40px;height:40px;background:rgba(0,0,0,.35)}
  .lb-prev{left:8px}.lb-next{right:8px}
  .lb-thumbs{grid-template-columns:repeat(6,1fr)}
}
@media (max-width:600px){.pgrid{grid-template-columns:1fr;gap:32px}}
@media (prefers-reduced-motion:reduce){.pcard.in{animation:none}.pimg img,.lb,.lb-img{transition:none}}
@media (max-width:900px){.lb-close{position:fixed;top:10px;right:10px;z-index:2;background:rgba(255,255,255,.95)}}
@media (max-width:600px){#projects .filters{flex-wrap:nowrap;overflow-x:auto;margin-right:-24px;padding-right:24px;scrollbar-width:none}#projects .filters button{flex:none}}

.lb-stage::after{content:"";position:absolute;inset:48px 72px;background-image:linear-gradient(rgba(255,255,255,.08) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.08) 1px,transparent 1px);background-size:32px 32px;display:none}
.lb.lb-noimg .lb-stage::after{display:block}
.lb-img[hidden]{display:none}




/* ---------- Left-column art: Mollier h,x diagram / formula column (pale, not the focus) ---------- */
.colart{position:absolute;left:24px;width:200px;top:52px;bottom:0;overflow:hidden;pointer-events:none;user-select:none}
.colart img{position:absolute;max-width:none;height:auto;opacity:.2;transform-origin:50% 40%}
.colf{opacity:.6;color:var(--ink)}
.colf span{position:absolute;white-space:nowrap;line-height:1;font-family:"IBM Plex Serif",Georgia,"Times New Roman",serif;font-style:italic}
.colf sub{font-size:.62em;vertical-align:-.3em;line-height:0}
.colf sup{font-size:.62em;vertical-align:.5em;line-height:0}
.colf .fr{display:inline-flex;flex-direction:column;align-items:center;font-size:.82em;line-height:1.12;vertical-align:middle;margin:0 .12em}
.colf .fr i{padding:0 .15em}
.colf .fr i:first-child{border-bottom:.05em solid currentColor}
.wrap>.sec-head,.wrap>.body{position:relative;z-index:1}
@media (max-width:1000px){.colart{display:none}}