:root{--ink:#090909;--yellow:#f4ff29;--red:#ff2548;--radium:#d9e8d6;--white:#fffefa;--grey:#e8e8e3;--shadow:6px 6px 0 var(--ink);--line:3px solid var(--ink);--measure:72ch}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:4rem}
body{margin:0;color:var(--ink);background:var(--radium);font:400 1rem/1.62 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration-thickness:2px;text-underline-offset:3px}a:hover{color:#b50025}
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,summary:focus-visible{outline:4px solid #e40024;outline-offset:3px}
img,svg{max-width:100%}button,input,textarea,select{font:inherit}button{cursor:pointer}
h1,h2,h3,h4{line-height:1.13;letter-spacing:-.035em;font-weight:900;margin:0 0 1rem}h1{font-size:clamp(2.55rem,5.2vw,5.4rem);max-width:17ch}h2{font-size:clamp(1.45rem,2.4vw,2.3rem);max-width:34ch}h3{font-size:1.11rem;letter-spacing:-.015em}p{margin:.5rem 0 1rem;max-width:var(--measure)}
.skip{position:absolute;left:-10000px;top:auto;z-index:99;background:var(--yellow);padding:1rem;font-weight:900}.skip:focus{left:1rem;top:1rem}
.site-header{background:var(--yellow);border-bottom:var(--line);position:relative;z-index:20}
.masthead{display:flex;gap:1rem;align-items:center;max-width:1380px;margin:auto;padding:.9rem clamp(1rem,3vw,2.2rem)}
.brand{display:flex;gap:.75rem;align-items:center;text-decoration:none;line-height:1.1;min-width:0}.brand:hover{color:var(--ink)}
.brand-mark{display:grid;place-items:center;font-size:1.75rem;font-weight:950;background:var(--red);border:var(--line);width:3.35rem;height:3.35rem;box-shadow:3px 3px var(--ink)}
.brand strong{display:block;font-size:clamp(1.05rem,2vw,1.6rem);letter-spacing:-.06em;font-weight:950}.brand small{font-size:.65rem;font-weight:850;letter-spacing:.06em}
.head-note{margin-left:auto;font-weight:850;font-size:.72rem;letter-spacing:.12em}
.btn{font-size:.9rem;line-height:1.2;font-weight:900;text-decoration:none;display:inline-flex;gap:.5rem;justify-content:center;align-items:center;border:var(--line);padding:.85rem 1rem;box-shadow:4px 4px 0 var(--ink);min-height:46px;transition:transform .15s,box-shadow .15s;color:var(--ink);border-radius:0}
.btn:hover{transform:translate(2px,2px);box-shadow:2px 2px var(--ink);color:var(--ink)}.btn-red{background:var(--red)}.btn-yellow{background:var(--yellow)}.btn-outline{background:var(--white)}
.btn:disabled{cursor:not-allowed;opacity:.55;transform:none;box-shadow:none}
.nav-wide{background:var(--white);border-top:var(--line);display:flex;flex-wrap:wrap;gap:0;justify-content:center}
.nav-wide a{padding:.48rem 1rem;border-right:2px solid var(--ink);font-weight:850;text-decoration:none;font-size:.85rem}
.nav-wide a:last-child{border-right:0}.nav-wide a:hover{background:var(--red);color:var(--ink)}
.nav-mobile{display:none}
#main{max-width:1380px;margin:auto;padding:0 clamp(.8rem,3vw,2.2rem) 3.5rem}
.breadcrumbs{margin:1.1rem 0;font-size:.78rem;font-weight:750}
.breadcrumbs ol{margin:0;padding:0;list-style:none;display:flex;flex-wrap:wrap;gap:.25rem .5rem}
.breadcrumbs li+li::before{content:"/";margin-right:.5rem}
.page-hero{border:var(--line);background:var(--red);box-shadow:var(--shadow);padding:clamp(1.3rem,3.5vw,3.4rem);display:grid;grid-template-columns:minmax(0,1.5fr) minmax(230px,.8fr);gap:2rem;margin-bottom:2.6rem;position:relative;overflow:hidden}
.hero-copy{z-index:1}.eyebrow{font-size:.76rem;line-height:1.35;font-weight:950;letter-spacing:.13em;text-transform:uppercase;margin:0 0 1.1rem}
.page-hero h1{margin-bottom:1.2rem}.hero-description{font-size:clamp(1.04rem,1.5vw,1.3rem);line-height:1.45;max-width:57ch;font-weight:600}
.hero-actions{display:flex;flex-wrap:wrap;gap:1rem;margin-top:1.6rem}
.hero-foot{border-top:3px solid var(--ink);display:flex;flex-wrap:wrap;gap:.5rem 1.4rem;font-size:.7rem;letter-spacing:.07em;font-weight:900;padding-top:1rem;margin-top:2rem}
.hero-illustration{margin:0;position:relative}.hero-illustration svg{display:block;width:100%;max-height:300px}.hero-illustration figcaption{font-size:.7rem;font-weight:800;margin-top:.5rem;text-align:center;line-height:1.4}
.hero-capsule{display:inline-block;background:var(--yellow);border:var(--line);padding:.4rem .8rem}
.content-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(235px,280px);align-items:start;gap:1.5rem}
.main-article{min-width:0}.section-card{background:var(--white);border:var(--line);box-shadow:var(--shadow);padding:clamp(1.1rem,2.2vw,2.2rem);margin:0 0 2.5rem;scroll-margin-top:1rem}
.section-grey{background:var(--grey)}.section-yellow{background:var(--yellow)}
.section-question{border-top:9px solid var(--red)}
.section-number{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;border-bottom:2px solid var(--ink);padding-bottom:.7rem;margin-bottom:1.3rem;font-size:.69rem;font-weight:950;letter-spacing:.11em}
.section-card h2{margin-bottom:1rem}.section-body>p:first-child{font-size:1.07rem;font-weight:650;line-height:1.52}
.section-body h3{margin-top:1.6rem}.section-body p:last-child{margin-bottom:.4rem}
.right-rail{position:sticky;top:1rem}
.contents,.rail-cta{border:var(--line);background:var(--white);padding:1rem;margin-bottom:1.2rem;box-shadow:4px 4px var(--ink)}
.contents>strong,.rail-cta strong{display:block;border-bottom:3px solid var(--ink);padding-bottom:.5rem;font-size:.77rem;letter-spacing:.08em}
.contents ol{list-style:none;padding:0;margin:.6rem 0;counter-reset:toc}.contents li{counter-increment:toc;display:grid;grid-template-columns:1.7rem 1fr;align-items:start;border-bottom:1px solid #aaa;padding:.55rem 0;font-size:.77rem;line-height:1.4}
.contents li::before{content:counter(toc,decimal-leading-zero);font-weight:950}.contents a{text-decoration:none;font-weight:700}.contents a:hover{text-decoration:underline}.rail-cta{background:var(--red)}.rail-cta p{font-size:.85rem;font-weight:650}
.definition-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.8rem;margin:1.3rem 0}
.definition-grid>div{border:2px solid var(--ink);background:var(--yellow);padding:.85rem}.definition-grid dt{font-size:.74rem;font-weight:900;text-transform:uppercase}.definition-grid dd{margin:.3rem 0 0;font-weight:650}
.card-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem;margin:1.2rem 0}
.mini-card{border:var(--line);padding:1.1rem;background:var(--white);box-shadow:3px 3px 0 var(--ink);min-width:0}.mini-card:nth-child(3n+2){background:var(--radium)}.mini-card:nth-child(3n+3){background:var(--yellow)}
.mini-card h3{margin:0 0 .5rem}.mini-card p{margin:.4rem 0 .8rem;font-size:.93rem}.mini-card a{font-weight:900;display:inline-block;margin-top:.2rem}
.table-scroll{overflow-x:auto;margin:1.1rem 0;outline:1px solid var(--ink);max-width:100%}
table{border-collapse:collapse;width:100%;min-width:470px;font-size:.9rem;background:var(--white)}
caption{text-align:left;font-weight:850;line-height:1.35;padding:.8rem;background:var(--yellow);border:2px solid var(--ink);border-bottom:0}
th,td{text-align:left;padding:.8rem;border:2px solid var(--ink);vertical-align:top;min-width:100px}
th{background:var(--radium);font-weight:900}tbody tr:nth-child(even){background:#f0f0eb}
.fact-list{padding-left:1.35rem}.fact-list li{margin:.5rem 0;padding-left:.18rem}
.fact-note{border:3px solid var(--ink);border-left:11px solid var(--red);background:var(--radium);padding:1rem 1.15rem;margin:1.2rem 0}
.fact-note strong{font-size:.85rem;letter-spacing:.04em;text-transform:uppercase}.fact-note p{margin:.4rem 0}
.action-strip{display:flex;gap:1rem;align-items:center;justify-content:space-between;border-top:3px solid var(--ink);background:var(--yellow);padding:1rem;margin:1.3rem 0 0}
.action-strip p{font-weight:750;margin:0;max-width:42ch}.section-bridge a{font-weight:850}.section-bridge{margin:1rem 0}
.steps{list-style:none;padding:0;counter-reset:steps;display:grid;gap:.75rem}
.steps li{counter-increment:steps;display:flex;align-items:start;gap:.8rem;border:2px solid var(--ink);padding:1rem;background:var(--white)}
.steps li::before{content:counter(steps,decimal-leading-zero);font-weight:950;font-size:1.3rem;background:var(--red);border:2px solid var(--ink);min-width:2.7rem;text-align:center;line-height:2.4rem}
.steps li strong{display:block;min-width:8rem}.steps li span{display:block;font-size:.88rem}
.rfq-panel{background:var(--red);border-width:4px}.rfq-panel .rfq-form{background:var(--white);padding:1rem;border:3px solid var(--ink)}.rfq-intro{border:2px solid var(--ink);background:var(--white);padding:.85rem 1.2rem}
.rfq-form{display:grid;gap:1rem;margin-top:1.3rem}
.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem}
.rfq-form label:not(.checkline){display:flex;flex-direction:column;gap:.35rem;font-size:.85rem;font-weight:900}
.rfq-form input:not([type=checkbox]),.rfq-form textarea,.rfq-form select{width:100%;border:2px solid var(--ink);border-radius:0;background:#fff;padding:.66rem .75rem;min-height:44px;color:var(--ink);outline-offset:2px}
.rfq-form textarea{min-height:92px;resize:vertical}
.rfq-form .checkline{font-weight:600;font-size:.8rem;display:flex;gap:.55rem;align-items:flex-start;line-height:1.5}
.checkline input{accent-color:#171717;width:20px;height:20px;flex:0 0 20px}
.rfq-form .honeypot{position:absolute;left:-9999px}
.form-privacy{border-top:2px solid var(--ink);padding-top:.9rem}
.turnstile-slot{min-height:58px}.turnstile-slot small{font-size:.78rem;display:block;font-weight:650}
.form-actions{display:flex;flex-wrap:wrap;gap:.8rem;align-items:center}.form-actions button{flex:0 0 auto}.form-status{font-size:.85rem;font-weight:700;margin:0;max-width:40ch}.form-status[data-status=success]{color:#11633c}.form-status[data-status=error]{color:#a50025}
.display-address{background:var(--yellow);font-weight:800;font-style:normal;border:var(--line);padding:1rem;margin:1rem 0}
.bottom-assurance{border:var(--line);background:var(--yellow);padding:1.2rem;margin:1rem 0 0;font-size:.85rem}
.site-footer{background:var(--ink);color:var(--white);border-top:8px solid var(--red)}
.footer-top{max-width:1380px;margin:auto;padding:3rem clamp(1rem,3vw,2.2rem);display:grid;grid-template-columns:2fr repeat(3,1fr);gap:1.8rem}
.footer-brand strong{font-size:clamp(1.5rem,3vw,2.3rem);letter-spacing:-.06em}.red-dot{color:var(--red)}.footer-brand p{max-width:42ch}.footer-brand address{font-style:normal;font-size:.85rem}
.site-footer nav{display:flex;flex-direction:column;gap:.42rem}.site-footer nav strong{color:var(--yellow);border-bottom:2px solid var(--yellow);font-size:.8rem;padding-bottom:.4rem;margin-bottom:.5rem}
.site-footer nav a{font-size:.84rem;text-decoration:none}.site-footer a:hover{color:var(--yellow);text-decoration:underline}
.footer-bottom{border-top:1px solid #666;padding:1rem clamp(1rem,3vw,2.2rem);max-width:1380px;margin:auto;display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;font-size:.72rem}
@media(max-width:1090px){.content-layout{grid-template-columns:1fr}.right-rail{position:static;display:grid;grid-template-columns:1fr 1fr;gap:1rem}.right-rail .contents{max-height:280px;overflow:auto}.footer-top{grid-template-columns:repeat(2,1fr)}}
@media(max-width:760px){.head-note,.head-quote,.nav-wide{display:none}.nav-mobile{display:block;border-top:var(--line);background:var(--white)}.nav-mobile summary{display:flex;justify-content:space-between;padding:.65rem 1rem;font-weight:900;cursor:pointer}.nav-mobile nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));padding:.6rem 1rem 1rem;gap:.35rem}.nav-mobile a{font-weight:800;border:2px solid var(--ink);padding:.45rem;text-decoration:none}.page-hero{grid-template-columns:1fr}.hero-art{max-width:280px;justify-self:center}.right-rail{display:block}.right-rail .contents{display:none}.definition-grid,.card-grid,.form-grid{grid-template-columns:1fr}.action-strip{display:block}.action-strip .btn{margin-top:1rem}.steps li{display:grid;grid-template-columns:3rem 1fr}.steps li strong,.steps li span{grid-column:2}.footer-top{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}}
@media(max-width:430px){.masthead{padding:.7rem}.brand-mark{height:2.8rem;width:2.8rem;font-size:1.25rem}.brand strong{font-size:1rem}.brand small{font-size:.54rem}.page-hero{padding:1rem}.page-hero h1{font-size:clamp(2.15rem,10vw,3rem)}.hero-foot{display:grid;gap:.25rem}.section-card{padding:1rem}.section-card h2{font-size:1.44rem}.footer-top{grid-template-columns:1fr}.footer-brand{grid-column:auto}.hero-actions .btn{width:100%}.action-strip .btn{width:100%}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.btn{transition:none}}
@media print{.site-header,.site-footer,.right-rail,.rfq-panel,.hero-actions,.action-strip{display:none}.page-hero,.section-card{box-shadow:none;break-inside:avoid}.content-layout{display:block}}


/* V2: Entity evidence imagery, technical data and verifiable external references */
.gallery-section{background:var(--grey)}
.photo-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr));gap:1.3rem}
.industrial-photo{margin:0;min-width:0;background:var(--white);border:3px solid var(--ink);box-shadow:4px 4px 0 var(--ink)}
.photo-frame{position:relative;aspect-ratio:4/3;overflow:hidden;background:var(--radium);border-bottom:3px solid var(--ink)}
.photo-frame img{display:block;width:100%;height:100%;object-fit:cover;object-position:center}
.photo-ribbon{position:absolute;bottom:.7rem;left:.65rem;right:.65rem;background:var(--yellow);color:var(--ink);border:2px solid var(--ink);padding:.4rem .5rem;font-size:clamp(.55rem,.9vw,.72rem);font-weight:950;line-height:1.25;letter-spacing:.02em}
.industrial-photo figcaption{padding:.8rem 1rem;font-weight:650;font-size:.85rem;line-height:1.48}
.new-technical{background:var(--white)}
#cylinder-safety-dimensions{background:var(--radium)}
#gas-regulatory-sources,#verified-regulatory-resources{background:var(--yellow)}
.spec-table{border-collapse:collapse;width:100%;font-size:.91rem;margin:1rem 0 1.4rem;max-width:100%}
.spec-table caption{font-weight:800;text-align:left;max-width:70ch;margin-bottom:.5rem;line-height:1.4}
.spec-table th,.spec-table td{border:2px solid var(--ink);padding:.65rem;text-align:left;vertical-align:top;word-break:normal}
.spec-table thead{background:var(--ink);color:var(--white)}
.spec-table tbody tr:nth-child(even){background:var(--grey)}
.spec-caveat{background:var(--yellow);border-left:8px solid var(--red);padding:1rem;font-weight:650}
.engineering-dl{margin:1.25rem 0}
.engineering-dl>div{display:grid;grid-template-columns:minmax(140px,1fr) minmax(0,2fr);border-top:2px solid var(--ink);gap:.7rem;padding:.75rem .3rem}
.engineering-dl>div:last-child{border-bottom:2px solid var(--ink)}
.engineering-dl dt{font-weight:950}
.engineering-dl dd{margin:0;max-width:65ch}
.gov-list{list-style:square;padding-left:1.3rem;margin:1rem 0}
.gov-list li{margin:.65rem 0;font-weight:700}
.gov-list a{overflow-wrap:anywhere}
.business-address{display:grid;gap:.35rem;border:3px solid var(--ink);background:var(--yellow);padding:1.3rem;font-style:normal;margin:1rem 0}
.contact-buttons{display:flex;flex-wrap:wrap;gap:1rem;margin:1rem 0 1.4rem}
.contact-buttons a{overflow-wrap:anywhere}
.footer-contact{display:flex;flex-direction:column;gap:.35rem;margin-top:.9rem}
.footer-contact a{color:var(--yellow);overflow-wrap:anywhere;font-size:.88rem;font-weight:750}
.policy-review-warning{border:3px solid var(--ink);background:var(--yellow);padding:1.2rem}
.form-contact-fallback{background:var(--yellow);border:3px solid var(--ink);padding:1rem;font-weight:700;overflow-wrap:anywhere}
@media(max-width:680px){
 .engineering-dl>div{grid-template-columns:1fr;gap:.2rem}
 .spec-table{font-size:.78rem}
 .spec-table th,.spec-table td{padding:.42rem;overflow-wrap:anywhere}
 .contact-buttons{flex-direction:column}
 .contact-buttons .btn{width:100%;justify-content:flex-start}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

.rfq-technical-details{border:3px solid var(--ink);background:var(--grey);padding:1rem;margin:1.5rem 0}.rfq-technical-details summary{font-weight:950;font-size:1.1rem;cursor:pointer}.rfq-technical-details[open] summary{margin-bottom:1rem}

.table-scroll{display:block;overflow-x:auto;max-width:100%;min-width:0;overscroll-behavior-x:contain;-webkit-overflow-scrolling:touch;margin:1rem 0 1.5rem;border:2px solid var(--ink)}.table-scroll table{margin:0;min-width:470px;max-width:none}.table-scroll:focus-visible{outline:3px solid var(--red)}