:root{--ink:#111630;--blue:#3050a0;--blue-d:#243d7d;--tint:#e8eef9;--paper:#f5f7fb;--line:#d5ddec;--text:#272d44;--muted:#4f5873;--green:#0f7a22;--green-d:#0b611b;--sky:#c3d1f7;--white:#fff;--pad:clamp(40px,4.5vw,80px)}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;max-width:1920px;margin-inline:auto;background:var(--paper);color:var(--text);font:400 18px/1.6 "Source Sans 3","Source Sans Pro",system-ui,sans-serif;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue-d)}
a:focus-visible,summary:focus-visible{outline:3px solid var(--green);outline-offset:3px}
.wrap{width:min(1340px,100% - 48px);margin-inline:auto}
h1,h2,h3,h4{font-family:"Bricolage Grotesque","Source Sans 3",sans-serif;color:var(--ink);margin:0;line-height:1.1;letter-spacing:-.015em}
h1{font-size:clamp(40px,4.6vw,72px);font-weight:700;letter-spacing:-.025em;line-height:1.03}
h2{font-size:clamp(28px,2.9vw,44px);font-weight:700}
h3{font-size:clamp(20px,1.7vw,26px);font-weight:600}
h4{font-size:19px;font-weight:600}
p{margin:0 0 1em;max-width:68ch}
.sec{padding-block:var(--pad)}
.sec.tint{background:var(--tint)}
.sec.white{background:var(--white)}
.sec.dark{background:var(--ink);color:#e6ebfb}
.sec.dark h2,.sec.dark h3{color:#fff}
.sec.dark a{color:var(--sky)}
.layers{width:56px;height:14px;margin-bottom:18px;background:linear-gradient(var(--ink) 0 4px,transparent 4px 5px,var(--blue) 5px 9px,transparent 9px 10px,var(--green) 10px 14px)}
.dark .layers{background:linear-gradient(#fff 0 4px,transparent 4px 5px,var(--sky) 5px 9px,transparent 9px 10px,#4cc263 10px 14px)}
/* banner + header */
.concept{background:var(--ink);color:#fff;font-size:15px;line-height:1.3;text-align:center;padding:9px 16px;min-height:38px}
.concept b{font-weight:600}
.site-header{background:var(--white);border-bottom:1px solid var(--line);position:relative;z-index:5}
.hd{display:flex;align-items:center;gap:32px;min-height:84px}
.logo{display:block;flex:none}
.logo img{height:52px;width:auto}
nav.main{flex:1;min-width:0}
nav.main ul{list-style:none;margin:0;padding:0;display:flex;gap:clamp(14px,2vw,34px);justify-content:flex-end;align-items:center;white-space:nowrap}
nav.main a{text-decoration:none;color:var(--ink);font-weight:600;font-size:17px;padding:8px 0;border-bottom:3px solid transparent}
nav.main a:hover,nav.main a[aria-current]{border-bottom-color:var(--green)}
nav.main a.cta{background:var(--green);color:#fff;padding:11px 22px;border-radius:6px;border:0}
nav.main a.cta:hover{background:var(--green-d)}
.btn{display:inline-flex;align-items:center;min-height:48px;padding:12px 26px;background:var(--green);color:#fff;font-weight:700;text-decoration:none;border-radius:6px;font-size:17px}
.btn:hover{background:var(--green-d)}
.btn.ghost{background:transparent;border:2px solid #fff;color:#fff}
.btn.ghost:hover{background:#fff;color:var(--ink)}
.btn.blue{background:var(--blue-d)}
.lnk{font-weight:700;color:var(--blue-d);text-underline-offset:4px}
/* heroes */
.hero{--ov:linear-gradient(90deg,rgba(17,22,48,.94) 0%,rgba(17,22,48,.8) 45%,rgba(17,22,48,.55) 100%);position:relative;display:flex;align-items:center;color:#fff;background-color:var(--ink);background-image:var(--ov),var(--hero);background-size:cover;background-repeat:no-repeat;background-position:center}
.hero .wrap{padding-block:24px}
.hero h1{color:#fff;max-width:15ch}
.hero p{font-size:clamp(18px,1.4vw,22px);max-width:52ch;color:#e6ebfb;margin-top:18px}
.hero .crumb{font-size:15px;margin:0 0 14px;color:#c3d1f7}
.hero .crumb a{color:#c3d1f7}
.hero.home{--ov:linear-gradient(90deg,rgba(17,22,48,.92) 0%,rgba(17,22,48,.65) 42%,rgba(17,22,48,0) 74%);min-height:clamp(340px,calc(100svh - 252px),640px);background-position:right center}
.hero.home h1{max-width:21ch}
.hero.inner{min-height:360px}
.hero .btns{display:flex;flex-wrap:wrap;gap:14px;margin-top:26px}
/* facts strip */
.facts{background:var(--white);border-bottom:1px solid var(--line)}
.facts ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(5,1fr)}
.facts li{padding:18px 24px;border-left:1px solid var(--line)}
.facts li:first-child{border-left:0;padding-left:0}
.facts strong{display:block;font:700 clamp(28px,2.6vw,40px)/1 "Bricolage Grotesque",sans-serif;color:var(--blue)}
.facts span{font-size:16px;color:var(--muted)}
/* generic */
.two{display:grid;grid-template-columns:5fr 6fr;gap:clamp(24px,5vw,90px);align-items:start}
.two.rev{grid-template-columns:6fr 5fr;align-items:center}
.lead{font-size:clamp(20px,1.6vw,24px);line-height:1.5;color:var(--ink)}
.ph{width:100%;object-fit:cover;border-radius:4px}
.rule{border:0;border-top:1px solid var(--line);margin:0}
/* home solutions index */
.index{list-style:none;margin:36px 0 0;padding:0;border-top:2px solid var(--ink)}
.index li{display:grid;grid-template-columns:minmax(0,4fr) minmax(0,5fr) minmax(0,3fr);gap:clamp(20px,3vw,56px);align-items:center;padding-block:30px;border-bottom:1px solid var(--line)}
.index h3{font-size:clamp(28px,3vw,46px)}
.index h3 a{text-decoration:none;color:var(--ink)}
.index h3 a:hover{color:var(--blue)}
.index .prods{font-weight:600;color:var(--blue-d);margin:0}
.index .tile{background:var(--white);border:1px solid var(--line);border-radius:4px;aspect-ratio:3/2;display:grid;place-items:center;padding:12px}
.index .tile img{max-height:100%;width:auto;object-fit:contain}
/* trio */
.trio{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(20px,2.4vw,40px);margin-top:36px}
.trio img{aspect-ratio:4/3;margin-bottom:18px}
.trio h3{margin:6px 0 10px}
.trio .mk{font-weight:700;color:var(--green);margin:0}
/* markets list */
.mklist{list-style:none;margin:0;padding:0}
.mklist li{padding:18px 0;border-bottom:1px solid var(--line);display:grid;grid-template-columns:minmax(0,200px) 1fr;gap:20px}
.mklist li:first-child{border-top:1px solid var(--line)}
.mklist h3 a{text-decoration:none;color:var(--ink)}
.mklist h3 a:hover{color:var(--blue)}
.mklist p{margin:0;color:var(--muted)}
/* eco band */
.eco{position:relative;color:#fff;background:linear-gradient(90deg,rgba(17,22,48,.96),rgba(17,22,48,.86)),url(https://www.seliggroup.com/wp-content/uploads/2022/12/Sustainability-Hero.jpg) center/cover}
.eco p{color:#e6ebfb}
.eco .grid{display:grid;grid-template-columns:1fr minmax(0,300px);gap:clamp(24px,5vw,80px);align-items:center}
.eco img{border-radius:4px;background:#fff}
/* news */
.news{list-style:none;margin:28px 0 0;padding:0;border-top:2px solid var(--ink)}
.news li{display:grid;grid-template-columns:200px 1fr;gap:20px;padding:20px 0;border-bottom:1px solid var(--line);align-items:baseline}
.news time{color:var(--muted);font-weight:600}
.news a{font:600 clamp(20px,1.7vw,26px)/1.25 "Bricolage Grotesque",sans-serif;color:var(--ink);text-decoration:none}
.news a:hover{color:var(--blue)}
/* reps */
.reps{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:28px}
.rep{background:var(--white);border:1px solid var(--line);border-left:6px solid var(--blue);padding:22px 24px;border-radius:4px}
.rep h3{margin-bottom:2px}
.rep p{margin:0 0 4px;color:var(--muted)}
.rep a{font-weight:700;word-break:break-word}
/* product table (container sealing etc.) */
.catalog{display:grid;grid-template-columns:repeat(3,1fr);column-gap:clamp(20px,3vw,48px)}
.catalog div{padding:16px 0;border-top:1px solid var(--line)}
.catalog h4{margin-bottom:4px}
.catalog h4 a{color:var(--ink);text-decoration:none}
.catalog h4 a:hover{color:var(--blue)}
.catalog p{margin:0;font-size:16px;color:var(--muted)}
.sidebar-l{display:grid;grid-template-columns:260px 1fr;gap:clamp(24px,4vw,64px);align-items:start}
.toc{position:sticky;top:20px;border-left:3px solid var(--blue);padding-left:18px}
.toc h2{font-size:20px;margin-bottom:10px}
.toc ol{list-style:none;margin:0;padding:0}
.toc a{display:block;padding:6px 0;text-decoration:none;color:var(--ink);font-weight:600}
.toc a:hover{color:var(--blue)}
.seal{display:grid;grid-template-columns:minmax(0,260px) 1fr;gap:28px;padding:30px 0;border-top:1px solid var(--line);scroll-margin-top:20px}
.seal img{aspect-ratio:4/3;object-fit:cover;border-radius:4px;background:#fff;border:1px solid var(--line)}
.seal h3{margin-bottom:8px}
/* defs */
.defs{display:grid;grid-template-columns:repeat(4,1fr);gap:0}
.defs div{padding:20px 22px 20px 0}
.defs div+div{padding-left:22px;border-left:1px solid var(--line)}
.defs h4{margin-bottom:6px}
.defs p{font-size:16.5px;color:var(--muted);margin:0}
/* checklist (no pseudo content) */
.bars{list-style:none;margin:0;padding:0;columns:4;column-gap:32px}
.bars li{break-inside:avoid;padding:9px 0 9px 14px;border-left:3px solid var(--green);margin-bottom:8px;font-weight:600;color:var(--ink);background:transparent}
.bars.three{columns:3}
.bars.two{columns:2}
/* bands */
.band{display:grid;grid-template-columns:1fr 1fr;align-items:stretch}
.band>img{width:100%;height:100%;min-height:340px;object-fit:cover;border-radius:0}
.band .txt{padding:var(--pad) clamp(24px,5vw,90px);display:flex;flex-direction:column;justify-content:center;align-items:flex-start}
.band.rev>img{order:2}
.band .txt ul{margin:0 0 20px;padding-left:20px}
.band .txt .tilefit{object-fit:contain}
.bandimg{display:grid;place-items:center;background:var(--white);padding:30px}
.bandimg img{max-height:380px;width:auto;object-fit:contain}
/* venting steps */
.vrow{display:grid;grid-template-columns:170px minmax(0,1fr) minmax(0,260px);gap:28px;align-items:center;padding:24px 0;border-top:1px solid var(--line)}
.vrow:last-child{border-bottom:1px solid var(--line)}
.vrow img{aspect-ratio:4/3;object-fit:cover;border-radius:4px;width:100%;order:3}
.vrow h3{font-size:clamp(22px,2vw,30px)}
.vrow .big{font:700 clamp(26px,2.4vw,38px)/1 "Bricolage Grotesque",sans-serif;color:var(--blue)}
.three3{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(20px,2.4vw,40px);margin-top:32px}
.three3 article{background:var(--white);border-radius:4px;overflow:hidden;border:1px solid var(--line)}
.three3 img{aspect-ratio:3/2;object-fit:cover;width:100%}
.three3 .in{padding:22px 24px 26px}
.three3 ul{padding-left:20px;margin:12px 0 0}
.three3 li{margin-bottom:8px}
/* flexible rail */
.rail{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border:1px solid var(--line);background:var(--white)}
.rail article+article{border-left:1px solid var(--line)}
.rail img{aspect-ratio:3/2;object-fit:cover;width:100%}
.rail .in{padding:22px 26px 28px}
.rail ul{padding-left:20px;margin:12px 0 0}
.rail li{margin-bottom:6px}
.quad{display:grid;grid-template-columns:1fr 1fr;gap:0}
.quad article{display:grid;grid-template-columns:minmax(0,200px) 1fr;gap:22px;padding:26px 28px 26px 0;border-top:1px solid var(--line)}
.quad article:nth-child(even){padding-left:28px;padding-right:0;border-left:1px solid var(--line)}
.quad img{aspect-ratio:1;object-fit:cover;border-radius:4px;width:100%}
.quad p{font-size:17px;margin:8px 0 0}
/* markets rows */
.mrow{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,6fr);gap:clamp(24px,4vw,72px);padding-block:clamp(28px,3vw,52px);border-top:1px solid var(--line);align-items:center}
.mrow:nth-child(even) .ph{order:2}
.mrow .ph{aspect-ratio:3/2}
.mrow .apps{color:var(--muted);font-size:16.5px}
/* timeline */
.tl{list-style:none;margin:36px 0 0;padding:0;border-left:3px solid var(--blue)}
.tl li{display:grid;grid-template-columns:130px minmax(0,1fr) minmax(0,300px);gap:28px;padding:0 0 38px 28px;align-items:start}
.tl .yr{font:700 clamp(30px,3vw,46px)/1 "Bricolage Grotesque",sans-serif;color:var(--blue)}
.tl img{aspect-ratio:3/2;object-fit:cover;border-radius:4px;width:100%}
.tl h3{margin-bottom:6px}
.vals{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:2px solid var(--ink)}
.vals div{padding:20px 20px 20px 0;border-bottom:1px solid var(--line)}
.vals h3{font-size:21px;margin-bottom:4px}
.vals p{font-size:16.5px;margin:0;color:var(--muted)}
.sites{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-top:28px}
.sites img{aspect-ratio:3/2;object-fit:cover;border-radius:4px;margin-bottom:10px}
.sites h3{font-size:20px}
.sites p{font-size:16px;margin:0;color:var(--muted)}
/* resources */
.rs{display:grid;grid-template-columns:240px 1fr;gap:clamp(24px,4vw,64px);align-items:start}
.rs-list{list-style:none;margin:20px 0 0;padding:0;border-top:2px solid var(--ink)}
.rs-list li{padding:14px 0;border-bottom:1px solid var(--line)}
.rs-list a{font-weight:700;text-decoration:none;color:var(--ink)}
.rs-list a:hover{color:var(--blue)}
.rs-list p{margin:4px 0 0;font-size:16.5px;color:var(--muted)}
.rs-block{margin-bottom:var(--pad)}
.rs-block:last-child{margin-bottom:0}
/* sustainability */
.pillars{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(20px,2.4vw,40px);margin-top:32px}
.pillars article{border-top:4px solid var(--green);padding-top:16px}
.pillars img{aspect-ratio:3/2;object-fit:cover;border-radius:4px;margin-bottom:16px;width:100%}
details.acc{border-top:1px solid var(--line);padding:0}
details.acc:last-of-type{border-bottom:1px solid var(--line)}
details.acc summary{cursor:pointer;list-style:none;padding:22px 0;font:600 clamp(20px,1.8vw,28px)/1.2 "Bricolage Grotesque",sans-serif;color:var(--ink);display:flex;justify-content:space-between;gap:20px}
details.acc summary::-webkit-details-marker{display:none}
details.acc .tog{flex:none;color:var(--blue);font-weight:700}
details.acc[open] .tog{transform:rotate(45deg)}
details.acc .body{padding:0 0 26px;display:grid;grid-template-columns:minmax(0,300px) 1fr;gap:28px;align-items:start}
details.acc .body.one{grid-template-columns:1fr}
details.acc .body img{aspect-ratio:3/2;object-fit:cover;border-radius:4px;width:100%}
/* footer */
.site-footer{background:var(--white);border-top:4px solid var(--blue);padding-block:56px 0;color:var(--text)}
.ft{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:40px}
.ft h2{font-size:18px;margin-bottom:12px}
.ft ul{list-style:none;margin:0;padding:0}
.ft li{margin-bottom:7px}
.ft a{color:var(--blue-d)}
.ft img{height:50px;width:auto;margin-bottom:14px}
.ft p{font-size:16px;color:var(--muted)}
.built{margin-top:40px;padding:20px 0;border-top:1px solid var(--line);font-size:15.5px;color:var(--muted)}
.built p{max-width:none;margin:0}
/* responsive */
@media (max-width:1100px){
 .index li{grid-template-columns:1fr 1fr}.index .tile{display:none}
 .catalog,.trio,.reps,.three3,.pillars{grid-template-columns:1fr 1fr}
 .defs,.vals,.sites{grid-template-columns:1fr 1fr}.defs div+div{border-left:0;padding-left:0}
 .bars{columns:2}.bars.three{columns:2}
 .ft{grid-template-columns:1fr 1fr}
 .sidebar-l,.rs{grid-template-columns:1fr}.toc{position:static}
 .tl li{grid-template-columns:100px 1fr}.tl img{display:none}
}
@media (max-width:900px){
 .hd{flex-wrap:wrap;gap:6px 16px;padding-block:10px;min-height:0}
 nav.main{flex:1 0 100%;overflow-x:auto;-webkit-overflow-scrolling:touch}
 nav.main ul{justify-content:flex-start;padding-bottom:6px}
 .two,.two.rev,.band,.mrow,.eco .grid,.seal,.quad article,.rail,.vrow,.news li,.mklist li,details.acc .body{grid-template-columns:1fr}
 .band.rev>img,.mrow:nth-child(even) .ph{order:0}
 .vrow img{order:0;max-width:320px}
 .rail article+article{border-left:0;border-top:1px solid var(--line)}
 .quad{grid-template-columns:1fr}.quad article:nth-child(even){padding-left:0;border-left:0}
 .quad article{grid-template-columns:120px 1fr}
 .facts ul{grid-template-columns:1fr 1fr}.facts li{border-left:0;padding:14px 12px 14px 0}
 .index li{grid-template-columns:1fr}
 .hero.home{background-position:70% center;--ov:linear-gradient(rgba(17,22,48,.88),rgba(17,22,48,.88))}
 .hero.inner{--ov:linear-gradient(rgba(17,22,48,.9),rgba(17,22,48,.9))}
}
@media (max-width:600px){
 .catalog,.trio,.reps,.three3,.pillars,.defs,.vals,.sites,.ft{grid-template-columns:1fr}
 .bars,.bars.three,.bars.two{columns:1}
 .hero.inner{min-height:320px}
 .facts ul{grid-template-columns:1fr 1fr}
 .logo img{height:44px}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}