@font-face{font-family:Helix;src:local('Arial');font-display:swap}
/* HELIX colour system: industrial graphite, warm paper and restrained heat accents. */
:root{--ink:#162A32;--muted:#536771;--paper:#F6F3ED;--white:#FFFFFF;--line:#D4DDE0;--amber:#F2B544;--amber-hover:#F7C568;--amber-pressed:#E8A431;--accent:#A84B12;--accent-hover:#813A10;--green:var(--amber);--deep:#193B46;--dark:#10262E;--surface:#EDF0F0;--surface-warm:#F5EFE5;--surface-hover:#E5EBED;--control-line:#718590;--line-strong:#6F858F;--on-dark:#D4DFE3;--on-dark-muted:#BFCDD3;--dark-line:#59747F;--overlay:rgba(16,38,46,.94);--header-glass:rgba(255,255,255,.97);--hover-wash:rgba(122,144,154,.14);--highlight:#F8EED9;--highlight-line:#D8B77A;--success:#27654C;--success-soft:#E8F1EB;--error:#A82F26;--error-soft:#FBEDEA;--warning:#6D4E13;--warning-soft:#FFF3D6;--warning-line:#D3B579;--disabled-ink:#435860;--disabled-surface:#E3E9EB;--shadow-soft:rgba(16,38,46,.08);--shadow-popup:rgba(16,38,46,.16);--media-black:#000000;--radius:5px;--wide:1320px;--font:Arial,Helvetica,sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid var(--ink);outline-offset:5px;box-shadow:0 0 0 5px var(--white)}img{max-width:100%;display:block}button:disabled{cursor:wait}h1,h2,h3,p{margin:0}h1,h2,h3{line-height:1.1;letter-spacing:-.04em}h1{font-size:clamp(2.7rem,5.6vw,5.2rem);font-weight:600}h2{font-size:clamp(2.1rem,3.8vw,3.4rem);font-weight:600}h3{font-size:1.4rem;font-weight:600}p+p{margin-top:1rem}.wrap{width:min(var(--wide),calc(100% - 96px));margin-inline:auto}.skip{position:fixed;left:20px;top:-90px;z-index:100;background:var(--green);padding:12px 20px}.skip:focus{top:10px}.topline{background:var(--dark);color:var(--on-dark);font-size:.8125rem;padding:8px 0}.topline .wrap{display:flex;justify-content:space-between;gap:20px}.topline b{color:var(--white);font-weight:400}.header{background:var(--header-glass);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:30}.nav{height:86px;display:flex;align-items:center;gap:35px}.brand{display:flex;align-items:center;min-width:165px;gap:11px}.brand img{width:156px;height:44px;object-fit:contain;object-position:left}.brand-text{font-size:2rem;letter-spacing:-.07em;font-weight:800}.brand-text small{display:block;font-size:.7rem;font-weight:600;letter-spacing:.35em;margin-top:-8px}.navlinks{display:flex;gap:25px;align-items:center;margin-left:auto}.navlinks a{font-size:.9rem;white-space:nowrap;font-weight:500}.navlinks a:hover,.navlinks a[aria-current=page]{color:var(--accent)}.lang{font-size:.875rem;border-left:1px solid var(--line);padding-left:20px;white-space:nowrap}.nav-cta{padding:12px 17px;background:var(--amber);color:var(--ink);border:1px solid var(--accent);font-size:.875rem;white-space:nowrap;border-radius:var(--radius)}.nav-cta:hover{background:var(--amber-hover);color:var(--ink)}.menu-btn{display:none;background:none;border:1px solid var(--control-line);border-radius:3px;min-height:44px;padding:5px 12px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:24px;min-height:54px;padding:14px 24px;background:var(--amber);border:1px solid var(--accent);border-radius:var(--radius);color:var(--ink);font-size:.9375rem;font-weight:600;transition:background .15s,transform .15s}.btn:hover{background:var(--amber-hover);transform:translateY(-1px)}.btn.secondary{background:transparent;border-color:var(--control-line);color:inherit}.btn.secondary:hover{background:var(--hover-wash)}.btn.dark{background:var(--ink);border-color:var(--ink);color:var(--white)}.btn.dark:hover{background:var(--deep)}.btn.small{min-height:44px;padding:10px 17px;font-size:.875rem}.arrow{font-size:1.2em;font-weight:400;line-height:1}.eyebrow{display:flex;align-items:center;gap:13px;text-transform:uppercase;font-size:.75rem;line-height:1.4;letter-spacing:.15em;font-weight:600;margin-bottom:23px}.eyebrow:before{content:'';width:25px;height:2px;background:currentColor}.hero{background:var(--dark);color:var(--white);position:relative;overflow:hidden}.hero-grid{display:grid;grid-template-columns:1.08fr 1fr;min-height:650px;align-items:center;gap:20px}.hero-copy{padding:70px 0 65px;position:relative;z-index:2}.hero .eyebrow{color:var(--green)}.hero h1 em{font-style:normal;color:var(--green)}.hero-intro{max-width:465px;color:var(--on-dark);font-size:1.0625rem;line-height:1.65;margin-top:27px}.hero-actions{display:flex;gap:13px;flex-wrap:wrap;margin-top:34px}.hero-actions .secondary{border-color:var(--dark-line)}.hero-note{display:flex;gap:14px;align-items:center;margin-top:35px;font-size:.8125rem;color:var(--on-dark)}.hero-note span{width:24px;height:1px;background:var(--green)}.hero-visual{height:100%;min-height:590px;position:relative;display:flex;align-items:center;justify-content:center}.hero-visual:before{content:'';position:absolute;inset:30px -70px 30px 0;border-radius:50%;background:radial-gradient(ellipse,var(--deep) 0%,transparent 69%)}.hero-image{width:115%;max-width:none;height:540px;object-fit:contain;position:relative}.equipment-tag{position:absolute;right:0;bottom:46px;min-width:230px;padding:19px 22px;background:var(--overlay);border:1px solid var(--dark-line);border-radius:var(--radius)}.equipment-tag small{display:block;color:var(--on-dark-muted);font-size:.75rem}.equipment-tag strong{display:block;font-size:1.35rem;letter-spacing:.02em}.equipment-tag span{font-size:.875rem;color:var(--green)}.metrics{background:var(--white);border-bottom:1px solid var(--line)}.metrics-grid{display:grid;grid-template-columns:repeat(4,1fr);padding:31px 0}.metric{padding:0 30px;border-left:1px solid var(--line)}.metric:first-child{padding-left:0;border:0}.metric strong{display:block;font-size:1.8rem;letter-spacing:-.05em;font-weight:500;line-height:1.2}.metric span{font-size:.8125rem;color:var(--muted);display:block;margin-top:7px}.section{padding:96px 0}.section.white{background:var(--white)}.section-head{display:flex;justify-content:space-between;align-items:end;gap:40px;margin-bottom:42px}.section-head p{max-width:380px;color:var(--muted)}.section-head .eyebrow{color:var(--muted)}.section-head h2{max-width:700px}.text-link{display:inline-flex;align-items:center;gap:25px;font-size:.9375rem;border-bottom:1px solid currentColor;padding-bottom:5px;font-weight:600}.section-head .text-link{white-space:nowrap}.lead{font-size:1.125rem;color:var(--muted);max-width:710px;margin-top:24px;line-height:1.7}.model-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.model-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:border-color .2s,transform .2s}.model-card:hover{border-color:var(--accent);transform:translateY(-3px)}.model-picture{height:250px;background:var(--surface);position:relative;padding:18px;overflow:hidden}.model-picture img{width:100%;height:100%;object-fit:contain;mix-blend-mode:multiply}.model-index{position:absolute;top:18px;left:20px;font-size:.75rem;color:var(--muted)}.model-badge{position:absolute;right:16px;top:16px;background:var(--green);padding:4px 9px;font-size:.6875rem;letter-spacing:.1em}.model-info{padding:25px}.model-title{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:13px}.model-title strong{font-size:1.125rem;white-space:nowrap;color:var(--deep)}.model-info p{color:var(--muted);font-size:.9375rem;min-height:48px}.model-foot{margin-top:24px;padding-top:18px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;font-size:.875rem}.model-foot span:last-child{font-size:1.5rem}.inline-note{margin-top:24px;font-size:.8125rem;color:var(--muted);max-width:900px}.technology-band{background:var(--deep);color:var(--white)}.technology-band .wrap{display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:center}.technology-photo{aspect-ratio:1.04;background:var(--surface);border-radius:var(--radius);overflow:hidden}.technology-photo img{width:100%;height:100%;object-fit:cover}.technology-copy .eyebrow{color:var(--green)}.technology-copy>p{color:var(--on-dark);margin-top:24px}.feature-list{margin:30px 0 35px;padding:0;list-style:none}.feature-list li{display:flex;gap:15px;padding:16px 0;border-bottom:1px solid var(--dark-line)}.feature-list .no{color:var(--green);font-size:.8125rem;padding-top:4px}.feature-list b{font-size:.9375rem;font-weight:500}.feature-list small{display:block;font-size:.8125rem;color:var(--on-dark-muted);margin-top:3px}.audience-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.audience-card{padding:35px 30px;border-left:1px solid var(--line)}.audience-card:first-child{padding-left:0;border-left:0}.audience-card .index{font-size:.75rem;color:var(--muted);display:block;margin-bottom:40px}.audience-card h3{max-width:300px}.audience-card p{margin:17px 0 25px;color:var(--muted);font-size:.9375rem}.fuel-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}.fuel-card img{aspect-ratio:1.7;object-fit:cover;width:100%;border-radius:var(--radius)}.fuel-card h3{margin:22px 0 12px}.fuel-card p{font-size:.9375rem;color:var(--muted)}.fuel-card .eyebrow{margin-top:22px;font-size:.75rem}.callout{display:grid;grid-template-columns:1fr auto;gap:40px;align-items:center;background:var(--green);padding:44px 48px;border-radius:var(--radius)}.callout p{margin-top:16px;max-width:660px}.callout h2{font-size:2.3rem}.process-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:26px}.process-step{border-top:1px solid var(--line);padding-top:22px}.process-step .index{color:var(--accent);font-size:.8125rem}.process-step h3{font-size:1.1rem;margin:27px 0 13px}.process-step p{font-size:.875rem;color:var(--muted)}.faq{max-width:900px}.faq details{padding:22px 0;border-bottom:1px solid var(--line)}.faq summary{cursor:pointer;font-size:1.0625rem;font-weight:500;list-style:none;display:flex;justify-content:space-between;gap:20px}.faq summary:after{content:'+';font-size:1.5rem;color:var(--accent);line-height:1}.faq details[open] summary:after{content:'−'}.faq details p{color:var(--muted);margin-top:17px;max-width:760px;font-size:.9375rem}.contact-section{background:var(--surface)}.contact-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:90px}.contact-grid h2{max-width:480px}.contact-grid .intro{color:var(--muted);margin:23px 0 36px;max-width:430px}.phone-link{display:block;font-size:clamp(1.3rem,2.5vw,2rem);letter-spacing:-.04em;margin-top:25px}.email-link{display:inline-block;color:var(--accent);margin-top:7px;border-bottom:1px solid var(--accent)}.contact-meta{margin-top:25px;color:var(--muted);font-size:.875rem}.contact-form{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:34px}.field-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.field{display:flex;flex-direction:column;gap:8px;margin-bottom:18px}.field.full{grid-column:1/-1}.field label{font-size:.875rem;font-weight:500}.field input,.field select,.field textarea{border:1px solid var(--control-line);background:var(--white);border-radius:3px;color:var(--ink);width:100%;min-height:48px;padding:11px 13px;font-size:1rem}.field textarea{min-height:105px;resize:vertical}.field input:hover,.field select:hover,.field textarea:hover{border-color:var(--accent)}.field small{color:var(--muted);font-size:.75rem}.check{display:flex;align-items:flex-start;gap:10px;font-size:.8125rem;color:var(--muted);margin:2px 0 22px}.check input{margin-top:4px;accent-color:var(--accent);width:16px;height:16px;flex-shrink:0}.check a{text-decoration:underline}.form-actions{display:flex;flex-wrap:wrap;gap:12px}.form-help{font-size:.75rem;color:var(--muted);margin-top:15px}.form-status{margin-top:15px;font-size:.875rem}.request-preview{background:var(--paper);border:1px solid var(--line);border-radius:4px;padding:16px;margin-top:20px}.request-preview textarea{width:100%;min-height:165px;background:transparent;border:0;resize:vertical;font-size:.875rem;color:var(--ink)}[hidden]{display:none!important}.footer{background:var(--dark);color:var(--on-dark);padding:62px 0 26px}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.1fr;gap:45px}.footer .brand-text{color:var(--white)}.footer .brand img{filter:brightness(0) invert(1);object-position:left}.footer-about{font-size:.875rem;max-width:280px;margin-top:22px}.footer h3{font-size:.75rem;text-transform:uppercase;letter-spacing:.12em;color:var(--white);margin-bottom:22px}.footer a:not(.brand){display:block;font-size:.875rem;margin-bottom:10px}.footer a:hover{color:var(--green)}.footer-bottom{border-top:1px solid var(--dark-line);margin-top:50px;padding-top:23px;display:flex;justify-content:space-between;gap:25px;font-size:.75rem}.footer-bottom a{font-size:.75rem!important;display:inline!important}.footer-policies{display:flex;gap:20px}.page-hero{padding:68px 0 64px;background:var(--surface-warm);border-bottom:1px solid var(--line)}.page-hero .eyebrow{color:var(--accent)}.page-hero h1{max-width:1040px;font-size:clamp(2.5rem,4.8vw,4.6rem)}.breadcrumbs{display:flex;gap:9px;flex-wrap:wrap;font-size:.75rem;color:var(--muted);margin-bottom:30px}.breadcrumbs a:hover{text-decoration:underline}.page-hero .lead{max-width:790px}.page-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}.page-grid{display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:start}.body-copy p{margin:0 0 20px;line-height:1.8;color:var(--muted)}.body-copy h2{font-size:2.1rem;margin:45px 0 20px}.body-copy h2:first-child{margin-top:0}.body-copy h3{margin:30px 0 15px}.body-copy ul{padding-left:22px;color:var(--muted)}.body-copy a{text-decoration:underline;text-underline-offset:3px}.info-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}.info-card{padding:30px;border:1px solid var(--line);border-radius:var(--radius);background:var(--white)}.info-card .index{display:block;font-size:.75rem;color:var(--muted);margin-bottom:25px}.info-card h3{margin-bottom:15px;font-size:1.2rem}.info-card p{font-size:.9375rem;color:var(--muted)}.info-card a{display:inline-block;margin-top:25px}.related{margin-top:55px;display:flex;flex-wrap:wrap;gap:12px}.related a{border:1px solid var(--line);background:var(--white);padding:10px 17px;border-radius:3px;font-size:.875rem}.related a:hover{border-color:var(--accent)}.calculator{display:grid;grid-template-columns:1.05fr .95fr;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--white)}.calculator-input{padding:38px}.calculator-input h2{font-size:1.7rem;margin-bottom:28px}.calculator-result{padding:40px;background:var(--deep);color:var(--white);display:flex;flex-direction:column;justify-content:center}.calculator-result .eyebrow{color:var(--green)}.result-value{font-size:clamp(2.5rem,4.5vw,4rem);line-height:1.1;letter-spacing:-.05em}.result-unit{font-size:1.15rem;margin-left:8px}.result-model{border-top:1px solid var(--dark-line);padding-top:25px;margin-top:30px}.result-model small{display:block;color:var(--on-dark);font-size:.8125rem}.result-model strong{display:block;font-size:1.6rem;margin:10px 0 8px}.result-description{color:var(--on-dark);font-size:.875rem;margin-top:18px}.calculator-result .btn{margin-top:25px;align-self:start}.calculation-details{margin-top:25px;padding:23px 26px;border:1px solid var(--line);border-radius:var(--radius);background:var(--white);color:var(--muted);font-size:.875rem}.calculation-details summary{cursor:pointer;color:var(--ink);font-weight:600}.calculation-details p{margin-top:15px}.comparison-table{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);margin-top:35px}.comparison-table table{width:100%;border-collapse:collapse;min-width:540px;font-size:.9375rem}.comparison-table th{text-align:left;background:var(--surface);font-size:.8125rem;font-weight:600;padding:19px 22px}.comparison-table td{padding:20px 22px;border-top:1px solid var(--line);background:var(--white)}.comparison-table a{font-weight:600}.comparison-table tr:hover td{background:var(--surface-warm)}.model-hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}.model-main-photo{background:var(--surface);border-radius:var(--radius);height:440px;padding:30px}.model-main-photo img{height:100%;width:100%;object-fit:contain;mix-blend-mode:multiply}.model-specs{display:grid;grid-template-columns:1fr 1fr;gap:0;margin-top:25px;border-top:1px solid var(--line)}.model-spec{padding:20px 0;border-bottom:1px solid var(--line)}.model-spec small{display:block;color:var(--muted);font-size:.75rem}.model-spec strong{font-size:1.15rem;font-weight:500}.filter-bar{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:27px}.filter-bar button{border:1px solid var(--control-line);padding:10px 18px;border-radius:3px;background:var(--white);font-size:.875rem;min-height:44px}.filter-bar button[aria-pressed=true]{background:var(--deep);color:var(--white);border-color:var(--deep)}.article-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}.article-card{border-top:1px solid var(--line);padding:28px 0;display:flex;flex-direction:column;align-items:start}.article-card .eyebrow{color:var(--accent)}.article-card h3{font-size:1.3rem;line-height:1.35}.article-card p{font-size:.875rem;color:var(--muted);margin:16px 0 25px}.article-card .text-link{margin-top:auto}.article-layout{display:grid;grid-template-columns:minmax(0,780px) 1fr;gap:80px}.article-layout aside{position:sticky;top:125px;height:fit-content;padding:27px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}.article-layout aside h3{font-size:1.25rem}.article-layout aside p{margin:15px 0 24px;font-size:.875rem;color:var(--muted)}.cookie-banner{position:fixed;left:24px;bottom:24px;max-width:470px;z-index:60;padding:25px;background:var(--white);box-shadow:0 6px 40px var(--shadow-popup);border:1px solid var(--line);border-radius:5px}.cookie-banner p{font-size:.875rem;margin-bottom:18px}.mobile-contact{display:none}.empty-state{padding:25px;background:var(--warning-soft);color:var(--warning);border:1px solid var(--warning-line);border-radius:4px}.stat-list{display:grid;grid-template-columns:1fr 1fr;gap:15px;margin:20px 0}.stat-list>div{padding:14px 0;border-bottom:1px solid var(--dark-line)}.stat-list dt{color:var(--on-dark);font-size:.8125rem}.stat-list dd{margin:5px 0 0;font-size:1.4rem}.financial-warning{font-size:.75rem;color:var(--on-dark-muted);margin-top:15px}.noscript{padding:15px 24px;background:var(--warning-soft);font-size:.875rem}.contact-title{font-size:1.3rem;margin-bottom:24px}.contact-form .hidden-trap{display:none}.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(min-width:1500px){.hero-image{height:570px}.hero-grid{min-height:690px}}
@media(max-width:1150px){.wrap{width:calc(100% - 64px)}.nav{gap:20px}.navlinks{gap:17px}.navlinks a{font-size:.8125rem}.nav-cta{display:none}.hero-grid{min-height:560px}.hero h1{font-size:4rem}.hero-visual{min-height:510px}.hero-image{height:460px}.hero-copy{padding:60px 0}.equipment-tag{bottom:30px}.section{padding:75px 0}.technology-band .wrap{gap:40px}.contact-grid{gap:40px}.model-picture{height:220px}.footer-grid{gap:25px}.navlinks .optional{display:none}.article-layout{gap:40px}.model-main-photo{height:360px}}
@media(max-width:850px){.wrap{width:calc(100% - 44px)}.topline .wrap span:last-child{display:none}.nav{height:74px;justify-content:space-between}.brand img{width:140px;height:42px}.brand{min-width:140px}.navlinks{display:none;position:absolute;top:74px;left:0;right:0;padding:20px 22px;background:var(--white);border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;gap:0;max-height:calc(100vh - 100px);overflow:auto}.navlinks.open{display:flex}.navlinks a{padding:14px 0;font-size:1rem;border-bottom:1px solid var(--line)}.navlinks .optional{display:block}.lang{margin-left:auto;padding-left:0;border:0}.menu-btn{display:block}.hero-grid{gap:0;grid-template-columns:1fr 1fr;min-height:540px}.hero h1{font-size:3.2rem}.hero-intro{font-size:1rem}.hero-visual{min-height:450px}.hero-image{height:360px;width:125%}.equipment-tag{bottom:20px;right:-5px;min-width:180px;padding:14px}.equipment-tag strong{font-size:1.1rem}.hero-actions .btn{min-height:48px;padding:11px 16px;gap:13px;font-size:.875rem}.metrics-grid{padding:26px 0}.metric{padding:0 17px}.metric strong{font-size:1.45rem}.metric span{font-size:.75rem}.section-head{align-items:start;gap:24px}.section-head p{max-width:270px;font-size:.9375rem}.model-grid{grid-template-columns:repeat(2,1fr)}.home-models .model-card:last-child{display:none}.technology-band .wrap{gap:30px}.technology-copy h2{font-size:2.3rem}.feature-list li{padding:13px 0}.audience-card{padding:27px 22px}.audience-card h3{font-size:1.2rem}.audience-card p{font-size:.875rem}.contact-grid{grid-template-columns:1fr;gap:35px}.contact-grid h2{max-width:700px}.contact-grid .intro{max-width:650px}.contact-form{max-width:750px}.footer-grid{grid-template-columns:1.6fr 1fr 1fr}.footer-grid>div:last-child{grid-column:1/-1;display:flex;gap:25px;align-items:start}.footer-grid>div:last-child h3{margin-top:7px}.callout{padding:32px;grid-template-columns:1fr;gap:25px}.callout .btn{justify-self:start}.process-grid{grid-template-columns:repeat(2,1fr);gap:35px}.info-grid{grid-template-columns:repeat(2,1fr)}.calculator-input,.calculator-result{padding:27px}.calculator .field-grid{grid-template-columns:1fr;gap:0}.model-hero-grid{gap:25px}.model-main-photo{height:350px;padding:10px}.model-specs{grid-template-columns:1fr}.article-grid{grid-template-columns:repeat(2,1fr)}.page-grid{gap:35px}.article-layout{grid-template-columns:1fr}.article-layout aside{position:static}.footer-bottom{flex-direction:column;gap:8px}}
@media(max-width:600px){.wrap{width:calc(100% - 36px)}.topline{font-size:.75rem;padding:7px 0}.topline .wrap{justify-content:center}.nav{height:68px;gap:14px}.navlinks{top:68px}.brand img{width:127px;height:38px}.brand{min-width:127px}.lang{font-size:.8125rem}.menu-btn{font-size:.8125rem;padding:7px 10px}.hero-grid{grid-template-columns:1fr}.hero-copy{padding:42px 0 12px}.hero h1{font-size:clamp(2.6rem,10vw,3.5rem);max-width:490px;line-height:1.04}.eyebrow{font-size:.6875rem;letter-spacing:.14em;margin-bottom:20px}.hero-intro{max-width:450px;margin-top:22px;font-size:1rem}.hero-actions{margin-top:25px;gap:10px}.hero-actions .btn{padding:13px 17px;min-height:50px;font-size:.875rem}.hero-note{margin-top:22px;font-size:.75rem}.hero-visual{height:335px;min-height:335px}.hero-image{height:325px;width:100%;margin-top:-8px}.hero-visual:before{inset:0 -40px}.equipment-tag{right:0;bottom:18px;padding:11px 15px;min-width:158px}.equipment-tag strong{font-size:1.05rem}.equipment-tag small{font-size:.6875rem}.equipment-tag span{font-size:.75rem}.metrics-grid{grid-template-columns:1fr 1fr;padding:22px 0;row-gap:24px}.metric{padding:0 0 0 20px}.metric:nth-child(3){border:0;padding:0}.metric strong{font-size:1.5rem}.metric span{font-size:.75rem}.section{padding:58px 0}h2{font-size:2.2rem}.section-head{flex-direction:column;align-items:start;gap:22px;margin-bottom:30px}.section-head p{max-width:none}.section-head .eyebrow{margin-bottom:14px}.section-head .text-link{font-size:.875rem}.model-grid{grid-template-columns:1fr;gap:18px}.home-models .model-card:last-child{display:block}.model-picture{height:255px}.model-info{padding:22px}.model-info p{min-height:0}.model-title h3{font-size:1.35rem}.model-title strong{font-size:1.05rem}.technology-band .wrap{grid-template-columns:1fr;gap:35px}.technology-photo{aspect-ratio:1.2}.technology-copy h2{font-size:2.2rem}.audience-grid{grid-template-columns:1fr}.audience-card,.audience-card:first-child{padding:25px 0;border-left:0;border-top:1px solid var(--line)}.audience-card:first-child{border-top:0}.audience-card .index{margin-bottom:20px}.audience-card h3{font-size:1.5rem;max-width:100%}.audience-card p{font-size:.9375rem}.audience-card .text-link{font-size:.875rem}.fuel-grid{grid-template-columns:1fr;gap:30px}.fuel-card img{aspect-ratio:2}.fuel-card h3{margin-top:19px}.fuel-card .eyebrow{margin-top:18px}.callout{padding:26px;gap:24px}.callout h2{font-size:1.8rem}.callout p{font-size:.9375rem}.process-grid{gap:25px}.process-step h3{font-size:1.1rem;line-height:1.25;margin:18px 0 12px}.process-step p{font-size:.875rem}.faq summary{font-size:1rem;line-height:1.5}.faq details{padding:19px 0}.contact-grid{gap:28px}.contact-form{padding:23px 19px}.field-grid{grid-template-columns:1fr;gap:0}.form-actions .btn{flex:1;white-space:nowrap;padding:13px;font-size:.875rem}.phone-link{font-size:1.6rem}.footer{padding:45px 0 90px}.footer-grid{grid-template-columns:1fr 1fr;gap:30px}.footer-grid>div:first-child{grid-column:1/-1}.footer-about{max-width:340px}.footer-grid>div:last-child{display:block}.footer-grid>div:last-child h3{margin-top:0}.footer-grid>div:last-child a{display:inline-block;margin-right:20px}.footer-bottom{margin-top:30px}.footer-policies{flex-wrap:wrap;gap:10px 20px}.page-hero{padding:35px 0 42px}.page-hero h1{font-size:2.7rem}.page-hero .lead{font-size:1rem;margin-top:20px}.breadcrumbs{margin-bottom:24px;font-size:.75rem}.page-grid{grid-template-columns:1fr;gap:30px}.info-grid{grid-template-columns:1fr;gap:16px}.info-card{padding:26px}.calculator{grid-template-columns:1fr}.calculator-input,.calculator-result{padding:27px 22px}.calculator .field-grid{grid-template-columns:1fr 1fr;gap:15px}.calculator .field-grid .full{grid-column:1/-1}.calculator .field-grid label{font-size:.8125rem}.calculator .field{margin-bottom:16px}.calculator-input h2{font-size:1.5rem}.calculator-result{padding:32px 25px}.result-value{font-size:3.5rem}.calculation-details{padding:20px}.model-hero-grid{grid-template-columns:1fr;gap:30px}.model-main-photo{height:320px}.model-specs{grid-template-columns:1fr 1fr}.article-grid{grid-template-columns:1fr}.article-card{padding:25px 0}.article-card h3{font-size:1.4rem}.body-copy h2{font-size:1.7rem}.article-layout{gap:35px}.filter-bar{gap:8px}.filter-bar button{font-size:.8125rem;padding:10px 12px}.mobile-contact{position:fixed;left:0;bottom:0;right:0;background:var(--white);display:grid;grid-template-columns:1fr 1fr;gap:10px;padding:10px 18px calc(10px + env(safe-area-inset-bottom));z-index:25;border-top:1px solid var(--line)}.mobile-contact a{display:flex;justify-content:center;align-items:center;min-height:43px;border:1px solid var(--control-line);border-radius:3px;font-size:.8125rem}.mobile-contact a:last-child{background:var(--amber);border-color:var(--accent);color:var(--ink);font-weight:600}.cookie-banner{left:12px;right:12px;bottom:85px;max-width:none;padding:20px}.cookie-banner .btn{min-height:43px;padding:9px 13px}.form-help{font-size:.75rem}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}
@media print{.header,.footer,.mobile-contact,.cookie-banner,.contact-form{display:none!important}.section{padding:25px 0}.wrap{width:100%}.page-hero{padding:20px 0}.calculator-result{background:var(--white);color:var(--ink)}.hero{background:var(--white);color:var(--ink)}a{color:inherit}}
.hero-visual.real-photo{min-height:0;align-self:stretch;margin:38px 0 38px 22px;border-radius:5px;overflow:hidden;background:var(--deep)}.hero-visual.real-photo:before{display:none}.real-photo .hero-image{width:100%;height:100%;min-height:570px;object-fit:cover;object-position:50% 63%}.real-photo .equipment-tag{right:22px;bottom:22px;background:var(--overlay);max-width:calc(100% - 44px)}.type-model{display:flex;align-items:center;justify-content:center;background:var(--surface-warm);height:225px}.power-type{font-size:7rem;font-weight:400;line-height:1;letter-spacing:-.07em;color:var(--deep)}.power-type small{font-size:1.25rem;letter-spacing:-.02em;margin-left:8px}.model-drawing-label{position:absolute;left:22px;bottom:16px;font-size:.6875rem;letter-spacing:.12em;color:var(--muted)}.model-main-photo{padding:0;overflow:hidden}.model-main-photo img{object-fit:cover;object-position:50% 68%;mix-blend-mode:normal}.editorial-photo{height:440px;width:100%;object-fit:cover;object-position:center 65%;border-radius:5px;margin-bottom:40px}.contact-h1{font-size:clamp(2.5rem,4vw,3.6rem)}.article-search{max-width:540px;margin-bottom:20px}.article-search input{background:var(--white)}.legacy-article>div{margin-bottom:18px}.legacy-article table{font-size:.875rem}.legacy-article h4{font-size:1.1rem;margin-top:25px}.legacy-article br{display:none}a[aria-disabled=true]{opacity:1;color:var(--disabled-ink);background:var(--disabled-surface);border-color:var(--control-line);pointer-events:none}.contact-form p>button{margin:10px 0}.btn{min-width:0}
@media(max-width:1150px){.real-photo .hero-image{min-height:530px}}
@media(max-width:850px){.hero-visual.real-photo{margin-left:10px;margin-block:26px}.real-photo .hero-image{min-height:500px}.real-photo .equipment-tag{min-width:0;right:14px;left:14px;max-width:none;padding:13px}.real-photo .equipment-tag strong{font-size:1rem}.power-type{font-size:6rem}}
@media(max-width:600px){.hero-visual.real-photo{height:400px;margin:24px 0 25px;min-height:400px}.real-photo .hero-image{height:400px;min-height:400px;margin:0;object-position:50% 73%}.real-photo .equipment-tag{left:auto;right:15px;bottom:15px;max-width:calc(100% - 30px);min-width:200px}.type-model{height:220px}.power-type{font-size:7rem}.editorial-photo{height:340px}.calculator .field-grid{grid-template-columns:1fr;gap:0}}

.applications-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}.application-card{display:flex;flex-direction:column;align-items:flex-start;padding:38px;border:1px solid var(--line);border-radius:5px;background:var(--surface-warm);transition:background .2s,border-color .2s}.application-card:hover{background:var(--highlight);border-color:var(--accent)}.application-card .index{font-size:.75rem;letter-spacing:.12em;color:var(--muted);margin-bottom:32px}.application-card h3{font-size:2rem;line-height:1.15;letter-spacing:-.04em;margin:0 0 18px}.application-card p{color:var(--muted);max-width:430px;margin:0 0 30px;line-height:1.65}.application-card .text-link{margin-top:auto}.model-applications{max-width:850px;font-size:1.125rem;color:var(--muted);line-height:1.7;margin:0 0 40px}
@media(min-width:851px) and (max-width:1050px){.nav{height:74px;justify-content:space-between}.brand img{width:140px;height:42px}.brand{min-width:140px}.navlinks{display:none;position:absolute;top:74px;left:0;right:0;padding:20px 32px;background:var(--white);border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;gap:0;max-height:calc(100vh - 110px);overflow:auto}.navlinks.open{display:flex}.navlinks a{padding:14px 0;font-size:1rem;border-bottom:1px solid var(--line)}.navlinks .optional{display:block}.lang{margin-left:auto;padding-left:0;border:0}.menu-btn{display:block}}
@media(max-width:600px){.applications-grid{grid-template-columns:1fr;gap:18px}.application-card{padding:28px 25px}.application-card h3{font-size:1.7rem}.application-card .index{margin-bottom:24px}.model-applications{font-size:1rem}}

.site-photo-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.site-photo{margin:0;min-width:0}.site-photo>a{display:block;border-radius:5px;overflow:hidden;background:var(--dark)}.site-photo img{width:100%;height:auto;aspect-ratio:3/4;object-fit:cover;display:block}.site-photo figcaption{font-size:.875rem;color:var(--muted);padding-top:14px;line-height:1.5}.operation-film{display:grid;grid-template-columns:1.1fr .9fr;align-items:center;gap:70px;margin-top:65px;padding:42px 52px;background:var(--dark);color:var(--white);border-radius:5px}.film-copy h3{font-size:2.5rem;line-height:1.15;letter-spacing:-.035em;margin:0 0 24px}.film-copy>p{color:var(--on-dark);line-height:1.7;max-width:460px}.film-copy .film-note{font-size:.875rem;margin-top:24px;color:var(--on-dark-muted)}.film-copy .text-link{margin-top:28px;color:var(--amber)}.film-copy .eyebrow{color:var(--amber)}.film-player{margin:0;min-width:0;justify-self:center;width:100%;max-width:340px}.film-player video{width:100%;height:auto;aspect-ratio:9/16;display:block;object-fit:contain;background:var(--media-black);border-radius:4px}.film-player figcaption{font-size:.875rem;line-height:1.5;color:var(--on-dark-muted);margin-top:12px}
@media(max-width:850px){.site-photo-grid{gap:17px}.operation-film{gap:30px;padding:32px}.film-copy h3{font-size:2rem}}
@media(max-width:600px){.site-photo-grid{grid-template-columns:none;grid-auto-flow:column;grid-auto-columns:min(82%,340px);gap:18px;overflow-x:auto;scroll-snap-type:x proximity;padding-bottom:12px}.site-photo{width:100%;scroll-snap-align:start}.operation-film{grid-template-columns:1fr;padding:28px 22px;gap:30px;margin-top:42px}.film-copy h3{font-size:1.9rem}.film-copy .text-link{margin-top:20px}.film-player{max-width:330px}.site-photo figcaption{padding-top:11px}}

/* Owner-supplied landscape and furnace photographs, 2026-10-11. */
.hero-visual.real-photo.installation-photo{height:auto;min-height:0;align-self:center;margin:38px 0 38px 22px;display:block;background:var(--dark)}
.hero-visual.installation-photo .hero-image{width:100%;height:auto;min-height:0;margin:0;aspect-ratio:4/3;object-fit:contain;object-position:center}
.installation-photo .equipment-tag{right:15px;bottom:15px;padding:12px 15px;min-width:0}
.installation-photo .equipment-tag strong{font-size:1.05rem}
.media-section .site-photo-grid:not(.photo-details) img{aspect-ratio:4/3;object-fit:contain;background:var(--dark)}
.site-photo-grid.installation-photo-grid{grid-template-columns:repeat(4,minmax(0,1fr))}
.site-photo-grid.photo-details{grid-template-columns:repeat(3,minmax(0,1fr));margin-top:32px}
@media(max-width:850px){.site-photo-grid.photo-details{grid-template-columns:repeat(3,minmax(0,1fr))}.hero-visual.real-photo.installation-photo{margin-left:10px}.installation-photo .equipment-tag{left:auto;right:12px;bottom:12px;max-width:calc(100% - 24px)}}
@media(max-width:600px){.hero-visual.real-photo.installation-photo{height:auto;min-height:0;margin:24px 0 25px}.site-photo-grid.photo-details{grid-template-columns:none;margin-top:24px}.installation-photo .equipment-tag{padding:9px 12px}.installation-photo .equipment-tag strong{font-size:.95rem}}

/* Motion follows the visitor's accessibility preference. */
@keyframes helix-entrance{from{opacity:0;transform:translate3d(0,18px,0)}to{opacity:1;transform:translate3d(0,0,0)}}
@keyframes helix-photo-entrance{from{opacity:0;transform:scale(1.025)}to{opacity:1;transform:scale(1)}}
.hero-copy .eyebrow,.hero h1,.hero-intro,.hero-actions,.hero-note{animation:helix-entrance .7s cubic-bezier(.2,.65,.3,1) both}
.hero h1{animation-delay:.08s}.hero-intro{animation-delay:.16s}.hero-actions{animation-delay:.24s}.hero-note{animation-delay:.3s}
.hero-visual.installation-photo .hero-image{animation:helix-photo-entrance 1s cubic-bezier(.2,.65,.3,1) both}
.reveal-ready{opacity:0;transform:translate3d(0,18px,0);transition:opacity .6s ease,transform .6s cubic-bezier(.2,.65,.3,1)}
.reveal-ready.is-visible,.reveal-ready:focus-within{opacity:1;transform:translate3d(0,0,0)}
.model-card,.application-card,.audience-card{transition:opacity .6s ease,transform .3s ease,box-shadow .3s ease}
.site-photo>a img{transition:transform .45s cubic-bezier(.2,.65,.3,1)}
.navlinks a,.text-link{transition:color .18s ease}
@media(hover:hover) and (pointer:fine){.model-card:hover,.application-card:hover{transform:translateY(-4px);box-shadow:0 14px 28px var(--shadow-soft)}.site-photo>a:hover img,.site-photo>a:focus-visible img{transform:scale(1.025)}}
@media(max-width:850px){.site-photo-grid.installation-photo-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:600px){.site-photo-grid.installation-photo-grid{grid-template-columns:none}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.hero-copy .eyebrow,.hero h1,.hero-intro,.hero-actions,.hero-note,.hero-visual.installation-photo .hero-image{animation:none}.reveal-ready{opacity:1;transform:none;transition:none}.model-card,.application-card,.audience-card,.site-photo>a img,.btn,.navlinks a,.text-link{transition:none}.model-card:hover,.application-card:hover,.site-photo>a:hover img,.site-photo>a:focus-visible img,.btn:hover{transform:none}}
@media print{.reveal-ready{opacity:1;transform:none;transition:none}.hero-copy .eyebrow,.hero h1,.hero-intro,.hero-actions,.hero-note,.hero-visual.installation-photo .hero-image{animation:none}}

/* Client services and practical learning share the site's visual language. */
.hero-learning{margin-top:24px;color:var(--green);font-size:.9rem}
.home-services{background:var(--dark);color:var(--white)}
.home-services .section-head .eyebrow,.home-services .info-card .eyebrow{color:var(--green)}
.home-services .section-head p,.home-services .info-card p{color:var(--on-dark)}
.home-services .info-card{background:var(--deep);border:1px solid var(--dark-line)}
.home-services .info-card h3{color:var(--white)}
.home-services .section-actions,.home-learning .section-actions{margin-top:30px;display:flex;gap:16px;flex-wrap:wrap;align-items:center}
.home-learning .article-card{background:var(--white);border:1px solid var(--line);border-radius:5px;padding:28px}
.home-learning .article-card h3{font-size:1.4rem;line-height:1.25}
.home-learning .article-card p{margin-top:18px}
.home-learning .article-card .text-link{margin-top:22px}
.service-checklist li{margin-bottom:12px}
.nav{gap:22px}.navlinks{gap:18px}
@media(min-width:1051px) and (max-width:1260px){.nav-cta{display:none}.navlinks{gap:16px}.navlinks a{font-size:.82rem}}
.library-intro{color:var(--muted);margin-bottom:26px}
.article-topics{margin-block:24px}
.article-byline{font-size:.875rem;color:var(--muted);margin-bottom:28px}
.article-answer{border-left:4px solid var(--accent);background:var(--highlight);padding:26px 30px;margin-bottom:32px;border-radius:4px}
.body-copy .article-answer h2{font-size:1.3rem;margin:0 0 15px}
.article-toc{background:var(--paper);border:1px solid var(--line);padding:24px 30px;margin-bottom:35px;border-radius:4px}
.body-copy .article-toc h2{font-size:1.25rem;margin:0 0 15px}
.article-toc ol{margin:0;padding-left:22px}.article-toc li+li{margin-top:8px}
.article-toc a,.article-sources a{color:var(--accent);text-decoration:underline;text-underline-offset:3px}
.knowledge-article section{scroll-margin-top:110px}
.knowledge-article .article-sources{border-top:1px solid var(--line);margin-top:32px}
.article-layout .related .text-link{display:block;line-height:1.5;margin-top:16px}
@media(max-width:600px){.article-answer,.article-toc{padding:22px}.home-learning .article-card{padding:24px}}

@view-transition{navigation:auto}
::view-transition-old(root),::view-transition-new(root){animation-duration:.22s;animation-timing-function:ease}
.page-hero{animation:helix-entrance .45s ease both}
.brand-technology .section-head h2{max-width:800px}
.brand-technology .info-card{background:var(--surface-warm);border:1px solid var(--line)}
.brand-technology .page-actions{display:flex;gap:16px;flex-wrap:wrap;margin-top:32px}
@media(prefers-reduced-motion:reduce){@view-transition{navigation:none}::view-transition-old(root),::view-transition-new(root){animation:none!important}.page-hero{animation:none}}
@media print{.page-hero{animation:none}}

/* Colour hierarchy and semantic states. Amber identifies commercial actions; neutral consent actions stay distinct. */
::selection{background:var(--amber);color:var(--ink)}
.text-link{color:var(--accent)}
.text-link:hover,.body-copy a:hover,.email-link:hover{color:var(--accent-hover)}
.hero .text-link,.technology-band .text-link,.home-services .text-link,.calculator-result .text-link,.operation-film .text-link{color:var(--amber)}
.hero .text-link:hover,.technology-band .text-link:hover,.home-services .text-link:hover,.calculator-result .text-link:hover,.operation-film .text-link:hover{color:var(--amber-hover)}
.callout .text-link{color:var(--ink)}
.btn:active,.nav-cta:active{background:var(--amber-pressed)}
.btn.secondary:active{background:var(--hover-wash)}
.btn.dark:active{background:var(--dark)}
.model-badge{color:var(--ink)}
.filter-bar button:hover:not([aria-pressed=true]){background:var(--highlight);border-color:var(--accent)}
.cookie-banner .btn{background:var(--surface);border-color:var(--control-line);color:var(--ink)}
.cookie-banner .btn:hover,.cookie-banner .btn:active{background:var(--surface-hover);border-color:var(--line-strong);color:var(--ink)}
.cookie-banner .btn.secondary{background:var(--white)}
.cookie-banner .btn.secondary:hover,.cookie-banner .btn.secondary:active{background:var(--surface)}
.field input::placeholder,.field textarea::placeholder{color:var(--muted);opacity:1}
.field input:disabled,.field select:disabled,.field textarea:disabled,button:disabled,.btn[aria-disabled=true]{opacity:1;color:var(--disabled-ink);background:var(--disabled-surface);border-color:var(--control-line)}
.field input[aria-invalid=true],.field select[aria-invalid=true],.field textarea[aria-invalid=true]{border-color:var(--error);background:var(--error-soft)}
.form-status{color:var(--ink)}
.form-status.is-error,.form-status[data-status=error]{color:var(--error)}
.form-status.is-success,.form-status[data-status=success]{color:var(--success)}
@media print{.hero h1 em,.hero .eyebrow,.calculator-result .eyebrow,.hero-learning{color:var(--ink)}}
/* Keep screen accents readable when dark panels are printed on white. */
@media print{.hero .eyebrow,.hero h1 em,.hero-intro,.hero-note,.hero .text-link,.hero .text-link:hover,.calculator-result,.calculator-result .result-kicker,.calculator-result .result-model,.calculator-result .result-model small,.calculator-result .result-description,.calculator-result .financial-warning,.calculator-result .stat-list dt,.calculator-result .text-link,.calculator-result .text-link:hover{color:var(--ink)}.hero .equipment-tag{color:var(--white)}}

/* Topic navigation scales with the library and uses the established palette. */
.page-hero h1{overflow-wrap:anywhere}.knowledge-article{min-width:0;overflow-wrap:anywhere}
.knowledge-summary{display:flex;align-items:center;flex-wrap:wrap;gap:18px 36px;margin-bottom:32px;padding-bottom:25px;border-bottom:1px solid var(--line)}
.knowledge-summary p{margin-right:auto;color:var(--muted)}.knowledge-summary strong{font-size:2rem;line-height:1;color:var(--ink);font-weight:600;letter-spacing:-.04em}
.knowledge-topics-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}
.knowledge-topic-card{padding:26px;display:flex;flex-direction:column;min-height:280px;background:var(--white);border:1px solid var(--line);border-radius:5px;transition:background .2s,border-color .2s,transform .2s}
.knowledge-topic-card:hover{background:var(--highlight);border-color:var(--accent);transform:translateY(-3px)}
.topic-card-top{display:flex;justify-content:space-between;align-items:center;gap:10px;color:var(--muted);font-size:.75rem;margin-bottom:32px}.topic-number{color:var(--accent);font-size:.9rem;letter-spacing:.08em}
.knowledge-topic-card h3{font-size:1.35rem;line-height:1.2;letter-spacing:-.025em}.knowledge-topic-card p{color:var(--muted);font-size:.9375rem;margin-top:16px;margin-bottom:25px}.knowledge-topic-card>.text-link{margin-top:auto}
.knowledge-reference{background:var(--dark);border-color:var(--dark);color:var(--white)}.knowledge-reference:hover{background:var(--deep);border-color:var(--dark-line)}.knowledge-reference p,.knowledge-reference .topic-card-top{color:var(--on-dark)}.knowledge-reference .text-link,.knowledge-reference .topic-number{color:var(--amber)}
.knowledge-paths{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.knowledge-path{padding:30px;border:1px solid var(--line);border-radius:5px;background:var(--paper)}
.knowledge-path h3{font-size:1.5rem;line-height:1.2}.knowledge-path>p{color:var(--muted);margin-top:18px}.knowledge-path ol{padding-left:24px;margin:24px 0 0}.knowledge-path li+li{margin-top:16px}.knowledge-path a{color:var(--accent);text-decoration:underline;text-underline-offset:4px}
.article-library .article-card{display:flex;flex-direction:column}.article-library .article-card[hidden]{display:none}.article-card-bottom{display:flex;align-items:center;flex-wrap:wrap;gap:12px 20px;margin-top:auto;padding-top:25px}.article-card-bottom small{font-size:.75rem;color:var(--muted)}.article-card-bottom .text-link{margin-top:0}
.article-new{display:block;letter-spacing:0;text-transform:none;color:var(--muted);font-size:.7rem;margin-top:7px}.article-more{margin-top:32px;text-align:center}.article-audience{color:var(--muted);font-size:.9375rem;margin-bottom:30px!important}
.knowledge-topic-intro{display:grid;grid-template-columns:1.4fr 1fr;gap:65px}.knowledge-topic-intro h2{font-size:2rem;line-height:1.15}.knowledge-topic-intro p{color:var(--muted);margin-top:22px}.knowledge-topic-intro .text-link,.knowledge-topic-intro .btn{margin-top:25px}.knowledge-topic-intro aside{padding:30px;background:var(--paper);border:1px solid var(--line);border-radius:5px}
.glossary-index{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:48px}.glossary-index a{padding:7px 14px;border:1px solid var(--control-line);border-radius:4px;font-size:.875rem;color:var(--ink);background:var(--paper)}.glossary-index a:hover{background:var(--highlight)}
.knowledge-glossary{margin:0 0 50px;max-width:980px}.knowledge-glossary>div{display:grid;grid-template-columns:.7fr 1.3fr;gap:35px;padding:28px 0;border-bottom:1px solid var(--line);scroll-margin-top:110px}.knowledge-glossary dt{font-size:1.35rem;font-weight:600;line-height:1.3;letter-spacing:-.02em}.knowledge-glossary dd{margin:0}.knowledge-glossary dd p{color:var(--muted)}.knowledge-glossary .text-link{margin-top:16px}
@media(max-width:1050px){.knowledge-topics-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.knowledge-paths{gap:18px}.knowledge-path{padding:24px}.knowledge-topic-intro{gap:35px}}
@media(max-width:850px){.knowledge-topics-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.knowledge-paths{grid-template-columns:1fr}.knowledge-topic-intro{grid-template-columns:1fr}.knowledge-summary .text-link{font-size:.9375rem}}
@media(max-width:600px){.page-hero h1{font-size:clamp(2rem,8.8vw,2.6rem)}.knowledge-topics-grid{grid-template-columns:1fr}.knowledge-topic-card{min-height:0;padding:24px}.topic-card-top{margin-bottom:22px}.knowledge-summary{gap:18px}.knowledge-summary p{flex-basis:100%}.knowledge-topic-intro aside{padding:24px}.knowledge-glossary>div{grid-template-columns:1fr;gap:14px}.glossary-index{gap:8px}.glossary-index a{padding:6px 11px}}
@media(prefers-reduced-motion:reduce){.knowledge-topic-card{transition:none}.knowledge-topic-card:hover{transform:none}}
@media print{.article-more,.article-search,.article-topics{display:none!important}.article-library .article-card[hidden]{display:flex!important}.knowledge-topics-grid,.knowledge-paths{grid-template-columns:repeat(2,minmax(0,1fr))}.knowledge-topic-card{transform:none;min-height:0}.knowledge-glossary>div{break-inside:avoid}.knowledge-topic-intro{grid-template-columns:1fr}}

/* Graphite glass header requested by the owner; original orange emblem is retained. */
.header{background:rgba(16,38,46,.90);color:var(--white);border-bottom-color:rgba(212,223,227,.18);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}
.header .brand{gap:11px}
.header .brand-emblem{display:block;width:36px;height:36px;flex:0 0 36px;border-radius:8px;background-image:url('/assets/helix-logo.png');background-size:160px 40px;background-position:-2px -2px;background-repeat:no-repeat}
.header .brand-text{color:var(--white);font-size:1.65rem;line-height:1;letter-spacing:-.04em}
.header .brand-text small{font-size:.58rem;line-height:1.2;letter-spacing:.3em;margin-top:3px;color:var(--on-dark-muted)}
.header .navlinks a{color:var(--on-dark)}
.header .navlinks a:hover,.header .navlinks a[aria-current=page]{color:var(--amber)}
.header .lang{color:var(--white);border-color:rgba(212,223,227,.25)}
.header .menu-btn{color:var(--white);border-color:var(--on-dark-muted)}
.header .menu-btn:hover,.header .menu-btn[aria-expanded=true]{background:rgba(212,223,227,.12)}
.header .navlinks.open{background:rgba(16,38,46,.98);border-color:var(--dark-line);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}
.header .navlinks.open a{border-color:var(--dark-line)}

/* Heat exchanger principle: two separate paths with decorative direction cues. */
.exchanger-feature{background:var(--paper)}
.exchanger-flow{margin:32px 0;padding:clamp(20px,4vw,40px);background:var(--dark);color:var(--white);border:1px solid var(--dark-line);border-radius:8px;min-width:0}
.exchanger-circuit+.exchanger-circuit{margin-top:26px;padding-top:26px;border-top:1px solid var(--dark-line)}
.exchanger-flow .circuit-label{font-size:.75rem;text-transform:uppercase;letter-spacing:.12em;color:var(--on-dark-muted);margin:0 0 14px}
.exchanger-circuit ol{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;list-style:none;margin:0;padding:0}
.exchanger-circuit li{position:relative;min-width:0;display:flex;align-items:center;margin:0}
.circuit-step{display:flex;align-items:center;width:100%;min-height:86px;padding:18px;border:1px solid var(--dark-line);border-radius:5px;background:rgba(255,255,255,.04);font-size:1rem;line-height:1.4}
.exchanger-circuit.air .circuit-step{border-color:rgba(242,181,68,.5);background:rgba(242,181,68,.08)}
.circuit-arrow{position:absolute;right:-23px;color:var(--on-dark-muted);font-size:1.2rem;animation:exchanger-direction 3s ease-in-out infinite}
.exchanger-circuit.air .circuit-arrow{color:var(--amber)}
.exchanger-flow figcaption{margin-top:24px;padding-top:20px;border-top:1px solid var(--dark-line);color:var(--on-dark-muted);font-size:.875rem;line-height:1.6}
.exchanger-promise{max-width:960px;color:var(--muted);line-height:1.7}
.exchanger-promise strong{display:block;margin-bottom:12px;color:var(--ink);font-size:1.35rem}
@keyframes exchanger-direction{0%,100%{transform:translateX(0);opacity:.65}50%{transform:translateX(3px);opacity:1}}
@media(max-width:700px){.exchanger-circuit ol{grid-template-columns:1fr;gap:27px}.circuit-step{min-height:64px}.circuit-arrow{top:100%;right:50%;transform:rotate(90deg);animation:none}.exchanger-flow{padding:22px}.exchanger-flow .circuit-label{font-size:.7rem}.exchanger-promise strong{font-size:1.2rem}}
@media(prefers-reduced-motion:reduce){.circuit-arrow{animation:none}}
@media print{.exchanger-flow{background:white;color:black;border-color:#888}.circuit-step{background:white!important;border-color:#888!important}.exchanger-flow .circuit-label,.exchanger-flow figcaption,.circuit-arrow{color:black!important}.circuit-arrow{animation:none}}