@font-face{font-family:"Arquitecta";src:url("fonts/ArquitectaBook.woff2") format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"Arquitecta";src:url("fonts/ArquitectaMedium.woff2") format("woff2");font-weight:500;font-display:swap}
@font-face{font-family:"Arquitecta";src:url("fonts/ArquitectaHeavy.woff2") format("woff2");font-weight:900;font-display:swap}
/* Layout: full-width bands alternating ink (dark) and paper (light); 72rem measure; the logo's hexagons are the PFAS motif throughout */
:root{
  --ink:#002e40; --ink-deep:#00202e; --teal:#1e9ba0; --teal-light:#5fc4c8;
  --paper:#f2f6f6; --paper-2:#e3ecec; --text-ink:#0b2633; --muted-ink:#4a6470; --muted-paper:#a9c3cc;
  --display:"Arquitecta","Avenir Next","Century Gothic","Futura",system-ui,sans-serif;
  --body:"Arquitecta","Avenir Next","Segoe UI",system-ui,sans-serif;
  --step-0:1.0625rem; --step-1:1.3rem; --step-2:clamp(1.6rem,1.2rem + 1.6vw,2.4rem); --step-3:clamp(2.2rem,1.4rem + 3.6vw,4.2rem);
  --mut:var(--muted-ink); --acc:var(--teal); --line:rgba(0,46,64,.14); --card:#fff;
  color-scheme:light;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:90px}
body{margin:0;background:var(--paper);color:var(--text-ink);font-family:var(--body);font-size:var(--step-0);line-height:1.6;font-weight:400;-webkit-font-smoothing:antialiased}
img,video,svg{max-width:100%;display:block}
a{color:inherit}
:focus-visible{outline:3px solid var(--teal);outline-offset:3px}
h1,h2,h3{font-family:var(--display);line-height:1.08;margin:0;text-wrap:balance;letter-spacing:-.01em}
h1{font-size:var(--step-3);font-weight:900;text-transform:uppercase;letter-spacing:.01em}
h2{font-size:var(--step-2);font-weight:900;text-transform:uppercase;letter-spacing:.02em}
h3{font-size:var(--step-1);font-weight:500}
p{margin:0;max-width:62ch}
.wrap{max-width:72rem;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
@media (min-width:700px){.wrap{padding-left:max(32px,env(safe-area-inset-left,0px));padding-right:max(32px,env(safe-area-inset-right,0px))}}
.band{padding-block:clamp(4rem,9vw,7.5rem)}
.dark{background:var(--ink);color:var(--paper);--mut:var(--muted-paper);--acc:var(--teal-light);--line:rgba(169,195,204,.25);--card:rgba(255,255,255,.04)}
.dark.deep{background:var(--ink-deep)}
.light{background:var(--paper);color:var(--text-ink)}
.eyebrow{font-family:var(--display);font-weight:500;font-size:.8rem;letter-spacing:.16em;text-transform:uppercase;color:var(--acc);display:flex;align-items:center;gap:.6rem}
.hex{width:.8em;height:.7em;background:currentColor;clip-path:polygon(25% 0,75% 0,100% 50%,75% 100%,25% 100%,0 50%);flex:none}
.stack{display:grid;gap:1.25rem;align-content:start}
.lead{font-size:var(--step-1);line-height:1.5}
.sub{color:var(--mut)}

/* header */
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:10;background:var(--ink)}
.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:9;background:rgba(0,46,64,.95);backdrop-filter:blur(8px);color:var(--paper)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding-block:1rem}
.brand img{height:68px;width:auto}
@media (max-width:600px){.brand img{height:52px}.top .wrap{padding-block:.75rem}}
.nav{display:flex;align-items:center;gap:1.5rem;font-family:var(--display);font-weight:500;font-size:.95rem}
.nav a{text-decoration:none;opacity:.85}.nav a:hover{opacity:1;color:var(--teal-light)}
.nav .lang{border:1.5px solid var(--teal);border-radius:2px;padding:.25rem .6rem;opacity:1;letter-spacing:.08em}
@media (max-width:900px){.nav .opt{display:none}}

/* hero */
.hero{position:relative;overflow:hidden;background:var(--ink-deep);color:var(--paper)}
.hero video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.32}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(100deg,var(--ink-deep) 20%,rgba(0,32,46,.6) 62%,rgba(0,32,46,.35))}
.hero .wrap{position:relative;z-index:1;padding-block:clamp(4.5rem,11vw,8.5rem) clamp(4rem,9vw,7rem);display:grid;gap:2.5rem;align-items:center}
@media (min-width:900px){.hero .wrap{grid-template-columns:1.25fr .75fr}}
.hero .copy{display:grid;gap:1.6rem;min-width:0}
.hero h1 em{font-style:normal;color:var(--teal-light)}
.hero .lead{color:#d5e4e8;max-width:46ch}
.signet{width:100%;max-width:440px;justify-self:center;overflow:visible}
@media (max-width:899px){.signet{max-width:260px;justify-self:start;order:-1}}
.signet .loop{fill:var(--teal)}
.signet .h{fill:var(--teal-light)}
.signet .s{animation:settle 2.2s cubic-bezier(.2,.8,.2,1) both}
.signet .f{animation:float 5s ease-in-out 2.4s infinite alternate;transform-box:fill-box;transform-origin:center}
@keyframes settle{from{transform:translate(var(--dx),var(--dy)) rotate(var(--r));opacity:.25}to{transform:none;opacity:1}}
@keyframes float{to{transform:translate(0,-1.2px)}}
@media (prefers-reduced-motion:reduce){.signet .s,.signet .f{animation:none}html{scroll-behavior:auto}}
.btns{display:flex;flex-wrap:wrap;gap:.8rem;margin-top:.4rem}
.btn{display:inline-flex;align-items:center;gap:.5rem;font-family:var(--display);font-weight:500;text-decoration:none;padding:.85rem 1.3rem;border-radius:2px;border:1.5px solid var(--teal);transition:background .2s,color .2s}
.btn.primary{background:var(--teal);color:#fff}.btn.primary:hover{background:var(--teal-light);border-color:var(--teal-light);color:var(--ink-deep)}
.btn.ghost{color:inherit}.btn.ghost:hover{background:rgba(30,155,160,.15)}

.split{display:grid;gap:clamp(2rem,5vw,4.5rem);align-items:start}
@media (min-width:860px){.split{grid-template-columns:1fr 1fr}.split.wide-left{grid-template-columns:1.2fr .8fr}}
.split>*{min-width:0}

.facts{list-style:none;margin:0;padding:0;display:grid;gap:1.1rem}
.facts li{display:grid;grid-template-columns:auto 1fr;gap:.9rem;align-items:baseline}
.facts li .hex{color:var(--acc);transform:translateY(.1em)}
.facts strong{font-weight:500;font-family:var(--display)}

.maplink{display:grid;gap:.6rem;padding:1.6rem;background:var(--ink);color:var(--paper);text-decoration:none;border-radius:2px;position:relative;overflow:hidden}
.maplink:hover{background:var(--ink-deep)}
.maplink .k{font-family:var(--display);font-size:.78rem;letter-spacing:.16em;text-transform:uppercase;color:var(--teal-light)}
.maplink .t{font-family:var(--display);font-size:var(--step-1);font-weight:500}
.maplink .sub{color:var(--muted-paper)}
.maplink .arr{color:var(--teal-light);font-weight:500}

/* principle diagrams */
.panels{display:grid;gap:1.5rem;margin-top:3rem}
@media (min-width:900px){.panels{grid-template-columns:1fr 1fr}}
.panel{margin:0;display:grid;gap:.9rem;min-width:0}
.panel figcaption{display:flex;align-items:center;gap:.6rem;font-family:var(--display);font-weight:500;font-size:var(--step-1)}
.panel figcaption .pill{font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;padding:.2rem .55rem;border-radius:2px;border:1px solid currentColor}
.panel.bad figcaption .pill{color:#f0a07a}
.panel.good figcaption .pill{color:var(--teal-light)}
.panel svg{width:100%;height:auto;border-radius:2px;background:#0b3a4e}
.panel p{color:var(--mut);font-size:.98rem}
.versus{display:grid;gap:1px;margin-top:clamp(3rem,6vw,4.5rem);background:var(--line);border:1px solid var(--line);border-radius:2px}
@media (min-width:760px){.versus{grid-template-columns:1fr 1fr}}
.versus>div{background:var(--ink);padding:1.6rem;display:grid;gap:.7rem;align-content:start}
.versus h3{display:flex;gap:.6rem;align-items:center}
.versus .us h3{color:var(--teal-light)}
.versus p{color:var(--mut)}
.versus .q{grid-column:1/-1;background:var(--ink-deep)}

/* steps + table */
.steps{list-style:none;margin:3rem 0 0;padding:0;display:grid;gap:1.5rem;counter-reset:s}
@media (min-width:760px){.steps{grid-template-columns:repeat(3,1fr)}}
.steps li{counter-increment:s;border-top:2px solid var(--teal);padding-top:1.1rem;display:grid;gap:.6rem;align-content:start}
.steps li::before{content:counter(s);font-family:var(--display);font-weight:900;font-size:2.4rem;line-height:1;color:var(--acc)}
.steps p{color:var(--mut)}
.compare{margin-top:clamp(3rem,6vw,5rem);overflow-x:auto}
.compare table{width:100%;min-width:620px;border-collapse:collapse;font-size:.95rem}
.compare th,.compare td{text-align:left;padding:.85rem .9rem;border-bottom:1px solid var(--line);vertical-align:top}
.compare thead th{font-family:var(--display);font-weight:500;font-size:.78rem;letter-spacing:.12em;text-transform:uppercase;color:var(--mut)}
.compare tbody th{font-family:var(--display);font-weight:500}
.compare tr.us{background:rgba(30,155,160,.12)}
.compare tr.us th{color:var(--acc)}
.compare caption{caption-side:bottom;text-align:left;padding-top:.8rem;font-size:.85rem;color:var(--mut)}

/* field trial */
.carbon{margin-top:3rem;display:grid;gap:1.4rem;padding:clamp(1.5rem,4vw,2.5rem);border:1.5px solid var(--teal);border-radius:2px;background:rgba(30,155,160,.08)}
@media (min-width:760px){.carbon{grid-template-columns:auto 1fr;align-items:center;gap:2.5rem}}
.carbon .icon{width:220px;height:auto}.carbon .k{font-family:var(--display);font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:var(--teal-light)}
.carbon .stack{gap:.8rem}
.gallery{margin-top:3rem;display:grid;gap:10px;grid-template-columns:repeat(2,1fr)}
@media (min-width:760px){.gallery{grid-template-columns:repeat(4,1fr);grid-auto-rows:220px;grid-auto-flow:dense}.gallery .tall{grid-row:span 2}.gallery .wide{grid-column:span 2}}
.gallery figure{margin:0;position:relative;overflow:hidden;border-radius:2px;background:#0b3a4e;min-height:180px}
.gallery img,.gallery video{width:100%;height:100%;object-fit:cover}
.gallery figcaption{position:absolute;left:0;right:0;bottom:0;padding:1.6rem .8rem .6rem;font-size:.82rem;color:#fff;background:linear-gradient(transparent,rgba(0,20,30,.75))}
.note{font-size:.88rem;color:var(--mut);margin-top:1.4rem}

/* timeline */
.timeline{list-style:none;margin:3rem 0 0;padding:0;display:grid;border-left:2px solid var(--line)}
.timeline li{position:relative;padding:0 0 2.2rem 2rem;display:grid;gap:.35rem}
.timeline li:last-child{padding-bottom:0}
.timeline li::before{content:"";position:absolute;left:-9px;top:.35rem;width:16px;height:14px;background:#b9cbd1;clip-path:polygon(25% 0,75% 0,100% 50%,75% 100%,25% 100%,0 50%)}
.timeline li.done::before{background:var(--ink)}
.timeline li.now::before{background:var(--teal)}
.timeline .when{font-family:var(--display);font-size:.8rem;letter-spacing:.14em;text-transform:uppercase;color:var(--mut)}
.timeline .tag{display:inline-block;margin-left:.6rem;font-size:.72rem;letter-spacing:.1em;padding:.1rem .45rem;border:1px solid var(--teal);color:var(--teal);border-radius:2px;vertical-align:.1em}
.timeline p{color:var(--mut)}

/* partner */
.who{display:grid;gap:1rem;margin-top:.5rem}
@media (min-width:600px){.who{grid-template-columns:1fr 1fr}}
.who div{padding:1.2rem 1.3rem;background:var(--card);border:1px solid var(--line);border-radius:2px;display:grid;gap:.3rem;align-content:start}
.who strong{font-family:var(--display);font-weight:500}
.who span{color:var(--mut);font-size:.95rem}
.contact{display:grid;gap:.9rem;padding:1.8rem;border:1.5px solid var(--teal);border-radius:2px;background:rgba(30,155,160,.08)}
.contact .mail{font-family:var(--display);font-size:var(--step-1);font-weight:500;color:var(--teal-light);word-break:break-all}
.contact address{font-style:normal;color:var(--mut);line-height:1.7}.contact address a{text-decoration:none;color:var(--paper)}

footer{background:var(--ink-deep);color:var(--muted-paper);font-size:.9rem}
footer .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:1.2rem;padding-block:2.4rem}
footer img{height:64px;width:auto}
footer nav{display:flex;gap:1.4rem}
footer a{text-decoration:none}footer a:hover{color:var(--teal-light)}

.legal .wrap{max-width:46rem}
.legal h2{font-size:1.2rem;margin-top:2rem}
.legal .ph{background:#fff3c4;padding:0 .25em}