/* YONGXING — site.css : one stylesheet for the whole site.
   Design system v4: DESIGN.md — DSI-referenced cold grotesque system.
   Archivo Expanded (display) + Inter (text); deep petrol, ice, one ice-cyan accent. */
:root{
  --ink:#12242E; --body:#22333D; --grey:#55707D; --deep:#07303E; --deep2:#0B4256;
  --ice:#EDF4F6; --well:#E4EEF1; --cyan:#35C4DC;
  --line:#D9E5E9; --tick:#B9CDD5; --max:1360px;
  --disp:"Archivo",Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Inter",Helvetica,Arial,sans-serif;color:var(--body);
  font-size:17px;line-height:1.6;background:#fff;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--deep);text-decoration:none}
a:hover{color:#0E6E87;text-decoration:underline;text-decoration-color:var(--cyan);text-underline-offset:3px}
h1,h2{font-family:var(--disp);font-stretch:125%;color:var(--deep);font-weight:700;line-height:1.08;letter-spacing:-0.01em;margin:0 0 18px}
h1{font-size:52px}
h2{font-size:36px;margin-bottom:14px}
h3{font-family:var(--disp);color:var(--ink);font-weight:600;font-size:20px;line-height:1.3;margin:0 0 8px}
p{margin:0 0 16px}
.wrap{max-width:var(--max);margin:0 auto;padding:0 32px}
.section{padding:84px 0 8px}
.section.light{background:var(--ice);padding:84px 0 72px;margin-top:84px}
.section-lead{font-size:19px;color:var(--grey);max-width:760px}
.lead{font-size:20px;color:var(--body);max-width:820px}
.text-link{font-weight:500}
/* header */
.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.hbar{display:flex;align-items:center;gap:36px;min-height:72px}
.brand{font-family:var(--disp);font-weight:800;font-size:22px;color:var(--deep);letter-spacing:-0.01em;white-space:nowrap}
.brand span{font-family:"Inter",Helvetica,Arial,sans-serif;font-weight:400;font-size:14px;color:var(--grey);margin-left:12px;padding-left:12px;border-left:2px solid var(--cyan)}
.brand:hover{color:var(--deep);text-decoration:none}
.mainnav{margin-left:auto;display:flex;align-items:center;gap:28px}
.mainnav ul{display:flex;gap:20px;list-style:none;margin:0;padding:0}
.mainnav a{font-size:14px;font-weight:500;color:var(--ink);white-space:nowrap;padding:6px 0}
.mainnav a:hover{color:var(--ink);text-decoration:none;box-shadow:inset 0 -2px 0 var(--cyan)}
.mainnav a[aria-current="page"]{color:var(--deep);box-shadow:inset 0 -2px 0 var(--cyan)}
.menu-btn{display:none;margin-left:auto;background:none;border:1px solid var(--line);
  font:inherit;font-size:15px;font-weight:500;color:var(--ink);padding:8px 14px;cursor:pointer;border-radius:3px}
/* buttons */
.btn{display:inline-block;font-weight:600;font-size:16px;padding:13px 26px;border-radius:3px;
  border:1px solid var(--deep);cursor:pointer;white-space:nowrap;transition:background .18s ease,color .18s ease}
.btn:hover{text-decoration:none}
.btn-navy{background:var(--deep);color:#fff}
.btn-navy:hover{background:var(--deep2);color:#fff}
.btn-outline{background:transparent;color:var(--deep)}
.btn-outline:hover{background:var(--deep);color:#fff}
.btn-light{background:transparent;color:#fff;border-color:#fff}
.btn-light:hover{background:#fff;color:var(--deep)}
.btn-nav{padding:9px 18px;font-size:14px;background:var(--deep);color:#fff !important}
.btn-nav:hover{background:var(--deep2)}
/* hero — v5 cinematic stage: full-viewport deep petrol, cut-out machine
   floating on a radial ice glow (photographic lighting), Ken Burns drift */
.stage{position:relative;background:var(--deep);color:#D7E5EA;overflow:hidden}
.stage-in{position:relative;min-height:calc(94vh - 72px);display:flex;flex-direction:column;
  justify-content:center;padding-top:56px;padding-bottom:88px}
.stage h1{font-size:66px;max-width:1020px;font-weight:600;color:#fff}
.stage h1 .hw{font-weight:800}
.stage .hl{display:block;animation:riseIn .8s ease both}
.stage .hl-2{animation-delay:.14s}
.hero-sub{font-size:21px;max-width:780px}
.stage .hero-sub{color:#C3D5DC;animation:riseIn .8s ease .28s both}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin:28px 0 0}
.stage .hero-cta{animation:riseIn .8s ease .42s both}
.btn-stage{background:#fff;color:var(--deep);border-color:#fff}
.btn-stage:hover{background:var(--ice);color:var(--deep)}
.stage-media{position:relative;margin-top:30px;animation:riseIn 1s ease .3s both}
.stage-media:before{content:"";position:absolute;inset:-14% -8% -10%;
  background:radial-gradient(ellipse 58% 55% at 50% 42%,rgba(53,196,220,.20),rgba(53,196,220,0) 70%);
  pointer-events:none}
.stage-img{position:relative;z-index:1;width:min(1040px,94%);margin:0 auto;
  animation:kb 18s ease-in-out infinite alternate}
.stage-shadow{position:relative;width:min(860px,74%);height:42px;margin:-10px auto 0;
  background:radial-gradient(ellipse at center,rgba(0,0,0,.45),rgba(0,0,0,0) 68%)}
.scroll-cue{position:absolute;right:34px;top:calc(100vh - 168px);z-index:2;width:56px;height:56px;
  border:1px solid rgba(255,255,255,.5);border-radius:50%;color:#fff;font-size:20px;line-height:1;
  display:flex;align-items:center;justify-content:center;animation:bob 2.6s ease-in-out infinite}
.scroll-cue:hover{color:#fff;text-decoration:none;border-color:#fff}
@keyframes kb{from{transform:scale(1)}to{transform:scale(1.06)}}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(7px)}}
@keyframes riseIn{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}
.data-strip{display:grid;grid-template-columns:repeat(4,1fr);padding:36px 0 30px;
  border-top:2px solid var(--cyan);border-bottom:1px solid var(--line)}
.data-cell{padding:2px 28px;border-left:1px solid var(--line)}
.data-cell:first-child{border-left:0;padding-left:0}
.data-num{display:block;font-family:var(--disp);font-stretch:125%;font-size:44px;font-weight:700;color:var(--deep);line-height:1.05;font-variant-numeric:tabular-nums}
.data-lab{display:block;color:var(--grey);font-size:15px;margin-top:6px}
/* temperature scale (signature device) */
.tscale{margin:30px 0 10px;max-width:860px}
.ts-track{position:relative;height:14px;border-top:1px solid var(--tick)}
.ts-band{position:absolute;top:-1px;height:3px;background:var(--cyan);opacity:.45}
.ts-tick{position:absolute;top:0;width:1px;background:var(--tick)}
.ts-mark{position:absolute;top:-4px;width:2px;height:11px;background:var(--cyan);margin-left:-1px}
.ts-mark:after{content:"";position:absolute;top:-4px;left:50%;margin-left:-4px;width:8px;height:8px;
  background:var(--cyan);border-radius:50%}
.ts-labels{position:relative;height:18px;margin-top:3px}
.ts-lab{position:absolute;transform:translateX(-50%);font-size:11px;color:var(--grey);
  font-variant-numeric:tabular-nums;white-space:nowrap}
.ts-lab:first-child{transform:none}
.ts-lab:last-child{transform:translateX(-100%)}
.ts-note{font-size:13.5px;color:var(--grey);margin:4px 0 0}
/* the verified-range band draws in when the scale is revealed */
.ts-band{transform-origin:left center}
html.rvin .tscale .ts-band{transform:scaleX(0);transition:transform 1s ease .25s}
html.rvin .tscale.on .ts-band{transform:scaleX(1)}
/* DSI-voice section headlines (home + hubs only): lowercase, final word 800 */
h2.lh{text-transform:lowercase;font-weight:500}
h2.lh .hw{font-weight:800}
/* cards & tiles */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:36px 28px;margin:28px 0 20px}
.card{display:block;position:relative;color:var(--body);background:#fff;border:1px solid var(--line);border-radius:3px;
  padding-bottom:18px;transition:transform .18s ease,border-color .18s ease}
.card:hover{text-decoration:none;transform:translateY(-2px);border-color:var(--cyan)}
.card-img{display:block;background:var(--well);padding:18px;margin-bottom:14px}
.card-img img{width:100%;height:230px;object-fit:contain}
.card-name{display:block;font-family:var(--disp);font-size:21px;font-weight:600;color:var(--ink);line-height:1.25;padding:0 18px}
.card-line{display:block;color:var(--grey);font-size:15px;margin-top:4px;padding:0 18px;font-variant-numeric:tabular-nums}
.card-more{display:block;color:var(--deep);font-weight:500;font-size:15px;margin-top:8px;padding:0 18px}
.card:hover .card-name{color:var(--deep)}
/* v5 colour-field cards (DSI products grid): the cut-out machine floats on a
   colour field, text sits bottom-left inside the field */
.card-field{padding:0;overflow:hidden;border:0;border-radius:4px;display:flex;flex-direction:column}
.card-field:hover{transform:translateY(-3px);border-color:transparent}
.card-stage{position:relative;display:flex;align-items:center;justify-content:center;
  min-height:238px;padding:28px 24px 2px}
.card-stage img{max-width:100%;max-height:202px;width:auto;height:auto;object-fit:contain}
.field-deep{background-color:var(--deep);
  background-image:radial-gradient(120% 95% at 82% 0%,rgba(53,196,220,.30),rgba(53,196,220,0) 58%)}
.field-deep .card-stage img{filter:drop-shadow(0 16px 16px rgba(0,0,0,.35))}
.field-ice{background:linear-gradient(165deg,#E8F1F3 0%,#C9DCE1 100%)}
.field-ice .card-stage img{filter:drop-shadow(0 14px 14px rgba(7,48,62,.18))}
.card-meta{display:block;padding:8px 22px 20px;margin-top:auto}
.card-field .card-line{padding:0;margin:0;font-size:13.5px}
.card-field .card-name{padding:0;margin-top:3px;font-size:22px}
.card-field .card-more{padding:0;margin-top:9px;font-size:13.5px;font-weight:600;
  letter-spacing:.05em;text-transform:uppercase;text-decoration:underline;
  text-decoration-color:var(--cyan);text-underline-offset:4px}
.field-deep .card-line{color:#A9C6CF}
.field-deep .card-name{color:#fff}
.card-field.field-deep:hover .card-name{color:#fff}
.card-field.field-ice:hover .card-name{color:var(--deep)}
.field-deep .card-more{color:#fff}
.field-ice .card-line{color:var(--grey)}
.field-ice .card-name{color:var(--ink)}
.field-ice .card-more{color:var(--deep)}
.tile-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;margin:28px 0 20px}
.tile{position:relative;display:block;border-radius:3px;overflow:hidden;min-height:230px;
  border:1px solid var(--line);transition:transform .18s ease,border-color .18s ease}
.tile:hover{text-decoration:none;transform:translateY(-2px);border-color:var(--cyan)}
.tile img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0}
.tile-meta{position:absolute;left:0;right:0;bottom:0;background:rgba(7,48,62,.78);padding:13px 20px 15px}
.tile-name{display:block;color:#fff;font-family:var(--disp);font-size:20px;font-weight:600}
.tile-more{display:inline-block;margin-top:5px;color:#fff;font-size:13px;font-weight:600;
  letter-spacing:.05em;text-transform:uppercase;text-decoration:underline;
  text-decoration-color:var(--cyan);text-underline-offset:4px}
.fam-title{margin-top:44px}
/* deep sections (dark used sparingly: factory story, CTA band, footer) */
.section.steel{background:var(--deep);color:#D7E5EA;padding:84px 0 72px;margin-top:84px}
.section.steel h2{color:#fff}
.section.steel p{color:#C3D5DC}
.section.steel .fact-num{color:#fff}
.section.steel .fact-lab{color:#9FB8C1}
.section.steel .text-link{color:var(--cyan)}
.section.steel .split img{background:var(--well);padding:14px}
.steel-hero{background:var(--deep);color:#D7E5EA;padding:6px 0 72px}
.steel-hero h1{color:#fff}
.steel-hero .lead{color:#C3D5DC}
.steel-hero .crumbs li{color:#9FB8C1}
.steel-hero .crumbs a{color:#C3D5DC}
.steel-hero .crumbs li+li:before{color:var(--cyan)}
.steel-hero .pfig{background:var(--deep2);margin-bottom:0}
.steel-hero .pfig img{background:transparent}
/* spec strip / tables */
.phead{padding:44px 0 8px}
.crumbs ol{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:26px 0 0;padding:0;font-size:14px;color:var(--grey)}
.crumbs li+li:before{content:"/";margin-right:8px;color:var(--tick)}
.crumbs a{color:var(--grey)}
.pfig{margin:26px 0;background:var(--well);padding:28px;text-align:center;border-radius:3px}
.pfig img{display:inline-block;max-height:640px;width:auto;max-width:100%;background:#fff}
.pfig.wide{padding:0;background:none;border-radius:0}
.pfig.wide img{width:100%;max-height:none;background:none}
.pfig figcaption{font-size:14px;color:var(--grey);margin-top:14px;text-align:left}
.gallery{display:flex;gap:20px;flex-wrap:wrap;margin:0 0 8px}
.gallery img{background:#fff;border:1px solid var(--line);padding:14px;max-height:260px;width:auto}
.gallery-3 img{flex:1 1 0;min-width:0;object-fit:cover;height:250px;width:100%}
.spec-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:28px;margin:34px 0 6px;
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:26px 0}
.spec-strip dt{font-size:14px;color:var(--grey);margin-bottom:6px}
.spec-strip dd{margin:0;font-family:var(--disp);font-stretch:125%;font-size:28px;font-weight:700;color:var(--deep);
  line-height:1.2;font-variant-numeric:tabular-nums}
.strip-note{font-size:14px;color:var(--grey)}
.spec-table{width:100%;border-collapse:collapse;margin:10px 0 8px;font-variant-numeric:tabular-nums}
.spec-table th,.spec-table td{text-align:left;padding:15px 18px 15px 0;border-bottom:1px solid var(--line);vertical-align:top}
.spec-table tbody th{font-family:var(--disp);font-weight:600;font-size:17px;color:var(--ink);width:32%}
.spec-table td:first-child{font-weight:500;color:var(--ink)}
.spec-table thead th{background:var(--deep);color:#fff;font-family:var(--disp);font-stretch:125%;font-weight:600;
  font-size:17px;padding:14px 18px;border-bottom:0}
.table-note{font-size:14px;color:var(--grey)}
.feat-grid{display:grid;grid-template-columns:1fr 1fr;gap:34px 48px;margin-top:10px}
.feat p{color:var(--body)}
.prose{max-width:860px}
.prose p{font-size:18px}
/* steps & flow */
.steps{display:grid;grid-template-columns:repeat(5,1fr);gap:30px;margin-top:14px}
.steps-1{grid-template-columns:1fr;max-width:860px;gap:8px}
.steps-1 .step{border-top:1px solid var(--line);padding-top:20px}
.flow{list-style:none;counter-reset:flow;margin:10px 0;padding:0;max-width:860px}
.flow li{counter-increment:flow;border-top:1px solid var(--line);padding:20px 0 6px}
.flow h3:before{content:counter(flow) ". ";color:var(--deep)}
/* facts */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:start}
.split img{background:var(--well)}
.fact-grid{display:grid;grid-template-columns:1fr 1fr;gap:26px 30px;margin:28px 0}
.fact-num{display:block;font-family:var(--disp);font-stretch:125%;font-size:34px;font-weight:700;color:var(--deep);line-height:1.1;font-variant-numeric:tabular-nums}
.fact-lab{display:block;color:var(--grey);font-size:15px;margin-top:4px}
/* faq */
.faq-list{border-top:1px solid var(--line);max-width:900px}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{display:flex;justify-content:space-between;align-items:center;width:100%;background:none;border:0;
  font:inherit;font-size:18px;font-weight:600;color:var(--ink);text-align:left;padding:20px 0;cursor:pointer}
.faq-q:after{content:"+";font-size:24px;font-weight:400;color:var(--deep);margin-left:16px}
.faq-q[aria-expanded="true"]:after{content:"–"}
.faq-a p{padding:0 0 20px;max-width:820px}
/* cta band */
.cta-band{background:var(--deep);margin-top:96px}
.band-in{display:flex;align-items:center;gap:40px;padding:64px 32px}
.band-in h2{color:#fff;margin-bottom:8px}
.band-in p{color:#C3D5DC;margin:0;max-width:640px}
.band-in .btn{margin-left:auto}
/* footer */
.site-footer{background:var(--deep);color:#C3D5DC;margin-top:0;padding:72px 0 0;
  border-top:1px solid rgba(255,255,255,.15)}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr 1fr;gap:36px}
.site-footer h3{font-family:var(--disp);font-size:17px;font-weight:600;color:#fff;margin-bottom:12px}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin-bottom:8px}
.site-footer a{color:#C3D5DC;font-size:14.5px}
.site-footer a:hover{color:#fff}
.foot-logo{font-family:var(--disp);font-size:22px;font-weight:800;color:#fff;letter-spacing:-0.01em}
.foot-brand p{font-size:14.5px;color:#93ACB5}
.foot-legal{border-top:1px solid rgba(255,255,255,.2);margin-top:48px;padding:22px 32px}
.foot-legal p{font-size:13.5px;color:#93ACB5;margin:0}
/* contact */
.contact-grid{display:grid;grid-template-columns:1.5fr 1fr;gap:64px;padding:20px 0 30px}
.field{margin-bottom:20px}
.field label{display:block;font-weight:500;margin-bottom:7px;color:var(--ink)}
.field input,.field select,.field textarea{width:100%;font:inherit;font-size:16px;color:var(--ink);
  border:1px solid #B9CDD5;border-radius:3px;padding:11px 13px;background:#fff}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--deep);outline:1px solid var(--deep)}
.field input[aria-invalid="true"],.field select[aria-invalid="true"]{border-color:#B3261E}
.err{color:#B3261E;font-size:14px;margin:6px 0 0}
.form-note{font-size:14px;color:var(--grey);margin-top:14px}
#send-btn[disabled]{opacity:.75;cursor:default}
.contact-side h3{margin-top:28px}
.checklist{list-style:none;padding:0;margin:0 0 16px}
.checklist li{padding-left:22px;position:relative;margin-bottom:8px}
.checklist li:before{content:"—";position:absolute;left:0;color:var(--deep)}
/* reveal (the .rvin class is added by JS only; no-JS keeps everything visible) */
html.rvin .rv{opacity:0;transform:translateY(10px);transition:opacity .5s ease,transform .5s ease}
html.rvin .rv.on{opacity:1;transform:none}
html.rvin a.card.rv,html.rvin a.tile.rv{transform:none;transition:opacity .5s ease,transform .18s ease,border-color .18s ease}
html.rvin a.card.rv.on,html.rvin a.tile.rv.on{transform:none}
html.rvin a.card.rv:hover,html.rvin a.tile.rv:hover{transform:translateY(-2px)}
html.rvin a.card-field.rv:hover{transform:translateY(-3px)}
/* responsive */
@media (max-width:1080px){
  .card-grid,.tile-grid{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .foot-grid{grid-template-columns:1fr 1fr}
  .spec-strip{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:820px){
  h1{font-size:38px}.stage h1{font-size:40px}h2{font-size:28px}
  .wrap{padding:0 20px}
  .stage-in{min-height:0;padding-top:44px;padding-bottom:76px}
  .stage-img{width:100%}
  .stage-shadow{height:30px}
  .scroll-cue{right:20px;top:auto;bottom:20px;width:48px;height:48px;font-size:17px}
  .card-stage{min-height:200px}
  .data-strip{grid-template-columns:repeat(2,1fr);gap:24px 0;padding:28px 0 24px}
  .data-cell{padding:2px 20px}
  .data-cell:nth-child(odd){border-left:0;padding-left:0}
  .data-num{font-size:30px}
  .spec-strip dd{font-size:24px}
  .menu-btn{display:block}
  .mainnav{display:none;position:absolute;top:100%;left:0;right:0;background:#fff;
    border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;gap:0;padding:10px 20px 20px}
  .mainnav.open{display:flex}
  .mainnav ul{flex-direction:column;gap:0}
  .mainnav li a{display:block;padding:11px 0;font-size:16px}
  .btn-nav{margin-top:12px;text-align:center}
  .brand span{display:none}
  .split,.contact-grid,.feat-grid{grid-template-columns:1fr}
  .band-in{flex-direction:column;align-items:flex-start;padding:48px 20px}
  .band-in .btn{margin-left:0}
  .section{padding:60px 0 4px}
  .section.light,.section.steel{padding:60px 0 52px;margin-top:60px}
  .steel-hero{padding-bottom:52px}
}
@media (max-width:560px){
  .card-grid,.tile-grid,.steps,.spec-strip{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr}
  .spec-table th,.spec-table td{padding:12px 10px 12px 0}
  .spec-table thead th{padding:12px 10px}
  .pfig{padding:18px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  html.rvin .rv{opacity:1;transform:none;transition:none}
  html.rvin .tscale .ts-band{transform:none;transition:none}
  .card,.tile,.btn{transition:none}
  .card:hover,.tile:hover{transform:none}
  .stage-img,.scroll-cue,.stage .hl,.stage .hero-sub,.stage .hero-cta,.stage-media{animation:none}
}