:root{--navy:#072b40;--ink:#103345;--blue:#006a9a;--cyan:#8edbef;--muted:#506772;--line:#cbdce4;--pale:#e1edf2;--paper:#e9f0f4;--white:#fff;--font:Arial,Helvetica,sans-serif}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:9rem}
body{margin:0;isolation:isolate;background:var(--paper);color:var(--ink);font-family:var(--font);font-size:1rem;line-height:1.7;-webkit-font-smoothing:antialiased}
.gas-backdrop{position:fixed;inset:0;z-index:-1;overflow:hidden;pointer-events:none;user-select:none;background:radial-gradient(ellipse at 12% 15%,rgba(182,214,227,.45),transparent 62%),radial-gradient(ellipse at 90% 78%,rgba(188,213,224,.35),transparent 58%)}
.gas-backdrop>span{position:absolute;transform:translate(-50%,-50%);color:rgba(31,95,123,.07);font-size:clamp(3rem,6.5vw,6.5rem);font-weight:500;line-height:1;letter-spacing:-.06em;white-space:nowrap}
.gas-backdrop sub{font-size:.44em;vertical-align:-.16em;line-height:0}
.gas-acetylene{top:18%;left:16%}
.gas-argon{top:12%;left:50%}
.gas-carbon-dioxide{top:20%;left:84%}
.gas-helium{top:49%;left:16%}
.gas-hydrogen{top:44%;left:50%}
.gas-methane{top:52%;left:84%}
.gas-nitrogen{top:82%;left:16%}
.gas-oxygen{top:78%;left:50%}
.gas-propane{top:87%;left:84%}
a{color:inherit;text-decoration:none}
a:focus-visible{outline:3px solid var(--blue);outline-offset:6px}
img{display:block;width:100%;height:auto}
h1,h2,h3,p,figure{margin:0}
h1,h2,h3{line-height:1.1;letter-spacing:-.045em;overflow-wrap:anywhere;hyphens:auto}
h2{font-size:clamp(2rem,3.6vw,3.6rem);font-weight:500}
h3{font-size:1.25rem;font-weight:600;line-height:1.3}
.wrap{width:min(1280px,calc(100% - 6rem));margin-inline:auto}
.skip-link{position:fixed;top:-100px;left:1rem;background:var(--navy);color:white;padding:1rem;z-index:20}
.skip-link:focus{top:1rem}
.site-header{position:sticky;top:0;z-index:10;border-bottom:1px solid var(--line);background:rgba(233,240,244,.94);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px)}
.header-inner{min-height:106px;display:flex;align-items:center;justify-content:space-between;gap:2rem;padding-block:1rem}
.brand{display:block;position:relative;width:15rem;aspect-ratio:1308/500;flex-shrink:0;overflow:hidden}
/* Display only the approved logo, excluding the numbered presentation margin. */
.brand img{position:absolute;width:148.470948%;max-width:none;height:auto;left:-24.464832%;top:-32%}
.header-inner nav{display:flex;gap:2rem;align-items:center;flex-wrap:wrap}
.header-inner nav a{font-size:.9375rem;padding:.65rem 0;position:relative}
.header-inner nav a:hover{color:var(--blue)}
.eyebrow{font-size:.8125rem;letter-spacing:.12em;font-weight:600;line-height:1.6;color:var(--blue)}
.hero{padding-top:4.5rem}
.hero-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.04fr);gap:3.5rem;align-items:center}
.hero-copy{padding-block:1rem 2rem}
.hero-copy .eyebrow{margin-bottom:1.8rem}
h1{font-size:clamp(2.6rem,5.1vw,4.9rem);font-weight:500;line-height:1.05;letter-spacing:-.065em}
h1 span{color:var(--blue)}
.hero-intro{margin-top:2rem;font-size:1.25rem;line-height:1.65;max-width:29rem}
.hero-detail{margin-top:1rem;max-width:28rem;color:var(--muted)}
.button{display:inline-flex;align-items:center;justify-content:space-between;gap:2rem;min-height:54px;margin-top:2rem;padding:.9rem 1.25rem;background:var(--navy);color:white;font-size:.9375rem;font-weight:600;transition:background .15s}
.button:hover{background:var(--blue)}
.button span{font-size:1.3rem}
.hero-photo{background:var(--pale);min-width:0}
.hero-photo img{aspect-ratio:1.08;object-fit:cover;object-position:center}
.hero-photo figcaption{display:flex;justify-content:space-between;flex-wrap:wrap;gap:.6rem 1rem;background:var(--navy);color:white;padding:1.1rem 1.3rem;font-size:.8125rem}
.hero-photo figcaption span:first-child{letter-spacing:.1em;color:var(--cyan);font-weight:600}
.application-strip{display:flex;justify-content:space-between;gap:1rem;border-top:1px solid var(--line);margin-top:3.5rem;padding-block:1.4rem;color:var(--muted);font-size:.9375rem}
.application-strip span{padding-left:1rem;border-left:2px solid #95c9da}
.section{padding-block:6.5rem}
.section-heading{display:grid;grid-template-columns:minmax(0,.65fr) minmax(0,1.35fr);gap:3.5rem;margin-bottom:3.7rem}
.section-heading>.eyebrow{padding-top:.65rem}
.section-heading h2+p{max-width:40rem;color:var(--muted);margin-top:1.6rem;font-size:1.125rem}
.system-grid,.purity-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border-top:1px solid var(--line)}
.system-grid article,.purity-grid article{padding:1.7rem 1.5rem 0;border-right:1px solid var(--line)}
.system-grid article:first-child,.purity-grid article:first-child{padding-left:0}
.system-grid article:last-child,.purity-grid article:last-child{border-right:0;padding-right:0}
.item-number{display:block;font-size:.875rem;color:var(--blue);margin-bottom:2rem}
.system-grid p,.purity-grid p{margin-top:1.1rem;color:var(--muted)}
.connections{background:rgba(205,225,235,.38)}
.connection-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.04fr);gap:3.5rem}
.connection-intro h2{margin-top:1.6rem}
.connection-intro>p:last-child{font-size:1.125rem;margin-top:1.8rem;color:var(--muted);max-width:26rem}
.vcr-feature{background:var(--navy);color:white;padding:2.6rem}
.technical-label{font-size:.75rem;letter-spacing:.11em;color:var(--cyan);font-weight:600}
.vcr-feature h3{font-size:2.5rem;margin-top:1.3rem;font-weight:500}
.vcr-feature h3+p{margin-top:1.3rem;color:#d2e2e9}
.feature-note{display:block;border-top:1px solid #365a6d;margin-top:1.8rem;padding-top:1.2rem;font-size:.875rem;color:var(--cyan)}
.component-row{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);gap:1.5rem;padding-block:1.7rem;border-bottom:1px solid #cbdce3}
.component-row h3{font-size:1.125rem;line-height:1.5}
.component-row p{color:var(--muted);font-size:.9375rem}
.surface-panel{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.04fr);gap:3.5rem;align-items:center;border-top:1px solid #bacfd9;margin-top:3.5rem;padding-top:2.7rem}
.surface-copy h3{font-size:clamp(1.75rem,2.6vw,2.5rem);font-weight:500;margin-top:1rem}
.surface-copy>p:last-child{color:var(--muted);margin-top:1rem;max-width:34rem}
.surface-unit{font-size:.875rem;font-weight:600;color:var(--blue)}
.roughness-scale{list-style:none;display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:.5rem;padding:0;margin:1.1rem 0 1.3rem}
.roughness-scale li{border-top:3px solid #a7c2d0;padding-top:.7rem;font-size:clamp(1.2rem,2vw,1.8rem);font-weight:500;letter-spacing:-.04em;font-variant-numeric:tabular-nums;line-height:1.3}
.roughness-scale li:nth-child(2){border-color:#94b7c9}
.roughness-scale li:nth-child(3){border-color:#78a6bd}
.roughness-scale li:nth-child(4){border-color:#508eab}
.roughness-scale li:nth-child(5){border-color:#287a9f}
.roughness-scale li:last-child{border-color:var(--blue);color:var(--blue)}
.surface-note{font-size:.9375rem;color:var(--muted)}
.surface-note strong{display:block;font-weight:500;color:var(--ink);margin-bottom:.35rem}
.welding-grid{display:grid;grid-template-columns:minmax(0,1.04fr) minmax(0,1fr);gap:5rem;align-items:center}
.welding-photo{min-width:0;background:var(--pale)}
.welding-photo img{aspect-ratio:1.1;object-fit:cover;object-position:center}
.welding-photo figcaption{padding:1rem 1.2rem;font-size:.75rem;letter-spacing:.09em;color:var(--muted)}
.welding-copy h2{margin-top:1.6rem}
.welding-copy>p:not(.eyebrow){color:var(--muted);margin-top:1.5rem}
.welding-points{padding:0;margin:1.8rem 0 0;list-style:none;border-top:1px solid var(--line)}
.welding-points li{padding:.8rem 0;border-bottom:1px solid var(--line);font-size:.9375rem}
.purity{background:rgba(205,225,235,.38)}
.purity-heading{max-width:46rem;margin-bottom:3rem}
.purity-heading h2{margin-top:1.6rem}
.purity-heading h2+p{max-width:34rem;color:var(--muted);font-size:1.125rem;margin-top:1.5rem}
.closing{background:var(--navy);color:white;padding-block:4.5rem}
.closing-inner{display:flex;justify-content:space-between;align-items:flex-end;gap:3rem}
.closing-inner>p{font-size:clamp(2.4rem,4.5vw,4.2rem);letter-spacing:-.05em;line-height:1.1}
.closing-inner>p span{color:var(--cyan)}
.closing-inner>div{max-width:26rem;font-size:1.25rem}
.closing-inner>div span{display:block;margin-top:.8rem;color:#bfdae6;font-size:.9375rem;line-height:1.8}
.footer-inner{display:flex;justify-content:space-between;align-items:center;gap:2rem;padding-block:2.4rem}
.footer-address{min-width:0;font-style:normal;font-size:.9375rem;line-height:1.7;overflow-wrap:anywhere}
.footer-address .address-label{display:block;font-size:.875rem;color:var(--muted);margin-bottom:.25rem}
.footer-inner>p{font-size:.875rem;color:var(--muted)}
.footer-inner>a:last-child{font-size:.875rem;color:var(--blue);white-space:nowrap}
@media(max-width:1100px){
  .wrap{width:calc(100% - 4rem)}
  .header-inner nav{gap:1.5rem}
  .hero-grid,.connection-grid,.section-heading,.surface-panel{gap:2.5rem}
  .welding-grid{gap:3rem}
  .system-grid article,.purity-grid article{padding-inline:1.1rem}
  .component-row{grid-template-columns:1fr;gap:.5rem}
}
@media(max-width:900px){
  .header-inner{flex-wrap:wrap;gap:.7rem 2rem;min-height:96px}
  .header-inner nav{gap:1.25rem}
  .brand{width:13.75rem}
  .hero{padding-top:3rem}
  .hero-grid{grid-template-columns:1fr;gap:2rem}
  .hero-copy{max-width:42rem;padding-bottom:0}
  h1{font-size:clamp(2.6rem,8vw,4.9rem)}
  .hero-intro,.hero-detail{max-width:38rem}
  .hero-photo img{aspect-ratio:16/9}
  .system-grid,.purity-grid{grid-template-columns:repeat(2,minmax(0,1fr));row-gap:2.5rem}
  .system-grid article,.purity-grid article{padding:1.7rem 1.7rem 0}
  .system-grid article:nth-child(2n),.purity-grid article:nth-child(2n){border-right:0;padding-right:0}
  .system-grid article:nth-child(2n+1),.purity-grid article:nth-child(2n+1){padding-left:0}
  .section-heading{grid-template-columns:1fr;gap:1.5rem}
  .connection-grid,.welding-grid{grid-template-columns:1fr;gap:2.5rem}
  .surface-panel{grid-template-columns:1fr;gap:1.8rem}
  .surface-values{max-width:42rem}
  .roughness-scale li{font-size:1.65rem}
  .connection-intro>p:last-child{max-width:35rem}
  .component-row{grid-template-columns:minmax(0,1fr) minmax(0,1.3fr);gap:1.5rem}
  .welding-photo img{aspect-ratio:16/10}
  .welding-copy{max-width:44rem}
  .closing-inner{align-items:flex-start;flex-direction:column;gap:2.5rem}
  .footer-inner{flex-wrap:wrap;gap:1.5rem 2rem}
  .footer-inner>p{order:3;width:100%}
}
@media(max-width:600px){
  html{scroll-padding-top:11rem}
  .wrap{width:calc(100% - 2.5rem)}
  .header-inner{padding-block:1rem .6rem;gap:.8rem}
  .header-inner nav{width:100%;justify-content:space-between;gap:.2rem .6rem;border-top:1px solid var(--line);padding-top:.3rem}
  .header-inner nav a{font-size:.875rem;padding:.6rem 0}
  .hero{padding-top:2.4rem}
  .hero-copy .eyebrow{margin-bottom:1.4rem}
  h1{font-size:clamp(2.45rem,10vw,3.6rem)}
  .hero-intro{font-size:1.125rem;margin-top:1.5rem}
  .hero-detail{font-size:1rem}
  .hero-photo img{aspect-ratio:4/3}
  .hero-photo figcaption{padding:1rem;font-size:.75rem}
  .application-strip{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-top:2.2rem;font-size:.875rem;padding-block:1.4rem}
  .section{padding-block:4rem}
  .section-heading{margin-bottom:2.3rem;gap:1.2rem}
  .section-heading h2+p{font-size:1rem}
  h2{font-size:2.3rem;line-height:1.13}
  .system-grid,.purity-grid{grid-template-columns:1fr;gap:0}
  .system-grid article,.purity-grid article{padding:1.5rem 0!important;border-right:0;border-bottom:1px solid var(--line)}
  .item-number{margin-bottom:1rem}
  .system-grid p,.purity-grid p{margin-top:.8rem}
  .vcr-feature{padding:1.7rem}
  .vcr-feature h3{font-size:2.2rem}
  .component-row{grid-template-columns:1fr;gap:.6rem;padding-block:1.4rem}
  .surface-panel{margin-top:2.5rem;padding-top:2rem}
  .roughness-scale{grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem}
  .gas-backdrop>span{font-size:clamp(2.25rem,9vw,3.25rem)}
  .welding-photo img{aspect-ratio:4/3}
  .welding-photo figcaption{font-size:.75rem;padding:.8rem 1rem}
  .purity-heading{margin-bottom:2rem}
  .closing{padding-block:3rem}
  .footer-inner{gap:1.4rem}
  .footer-inner>p{line-height:1.6}
}
@media(max-width:350px){
  .header-inner nav{justify-content:flex-start;column-gap:1rem}
  .footer-inner>a:last-child{width:100%}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.button{transition:none}}

.closing-inner .contact-link{display:block;width:fit-content;max-width:100%;margin-top:1rem;color:white;font-size:1.15rem;overflow-wrap:anywhere;text-underline-offset:.25em}
.closing-inner .contact-link:hover{color:var(--cyan)}
.closing-inner .contact-link:focus-visible{outline:2px solid var(--cyan);outline-offset:5px}