:root{--ink:#142c34;--muted:#576970;--teal:#0b625f;--teal-dark:#073c3c;--cream:#f7f5ee;--pale:#e8efeb;--line:#dce3df;--white:#fff;--accent:#bfe7d3;font-family:ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--white);font-size:16px;line-height:1.65}a{color:inherit;text-decoration:none}a:focus-visible,button:focus-visible{outline:3px solid #e49536;outline-offset:4px}img{max-width:100%;height:auto}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.12;letter-spacing:-.045em}h1{font-size:clamp(3rem,6vw,6.3rem);font-weight:600}h2{font-size:clamp(2.1rem,3.5vw,3.6rem);font-weight:570}h3{font-size:1.55rem;font-weight:600}.wrap{width:min(100% - 48px,1240px);margin-inline:auto}.skip-link{position:absolute;top:-100px;left:12px;z-index:100;background:white;padding:10px}.skip-link:focus{top:12px}.site-header{background:#fff;position:relative;z-index:5;border-bottom:1px solid var(--line)}.header-inner{display:flex;align-items:center;justify-content:space-between;min-height:86px;gap:32px}.brand{display:flex;align-items:center;gap:11px;white-space:nowrap;line-height:1.1}.brand-mark{display:grid;place-items:center;width:39px;height:39px;background:var(--teal);color:#fff;border-radius:50%;font-size:1.8rem}.brand strong{font-size:1.05rem;letter-spacing:.07em}.brand small{display:block;font-size:.51rem;letter-spacing:.2em;margin-top:6px;color:var(--muted)}.primary-nav{display:flex;gap:clamp(12px,2vw,28px);align-items:center}.primary-nav a{font-size:.85rem;font-weight:650;padding:10px 0}.primary-nav a:hover,.text-link:hover{color:var(--teal)}.menu-toggle{display:none}.eyebrow{font-size:.72rem;letter-spacing:.16em;font-weight:750;color:var(--teal);text-transform:uppercase;margin-bottom:20px}.hero{background:#ecf1ed;overflow:hidden}.hero-inner{display:grid;grid-template-columns:1fr .82fr;align-items:center;min-height:565px;gap:55px;padding-block:75px}.hero h1{max-width:780px;margin-bottom:24px}.hero h1 em{font-style:normal;color:var(--teal)}.hero-lede,.page-lede{color:#4c6468;font-size:1.2rem;max-width:620px}.actions{display:flex;align-items:center;gap:25px;margin-top:33px;flex-wrap:wrap}.button{display:inline-flex;align-items:center;gap:30px;background:var(--teal);color:#fff;padding:14px 21px;border-radius:4px;font-size:.9rem;font-weight:700;transition:background .2s}.button:hover{background:var(--teal-dark)}.text-link{font-size:.9rem;font-weight:750;white-space:nowrap}.hero-graphic{aspect-ratio:1;max-width:450px;width:100%;justify-self:end;position:relative;border:1px solid #8ab5a8;border-radius:50%;background:radial-gradient(circle at 65% 35%,#d8e8dd 0,#9dcbb7 40%,#306f69 100%);box-shadow:0 24px 80px #12484122;overflow:hidden}.hero-graphic:before,.hero-graphic:after{content:"";position:absolute;inset:15%;border:1px solid #e9fff078;border-radius:50%}.hero-graphic:after{inset:31%}.blueprint-circle{position:absolute;border:1px solid #e8f6e48c;border-radius:50%;transform:rotate(-30deg)}.circle-one{width:150%;height:43%;left:-25%;top:28%}.circle-two{width:43%;height:150%;left:28%;top:-25%}.circle-three{width:80%;height:80%;left:10%;top:10%;border-style:dashed}.diagram-label{position:absolute;color:#f2fff6;letter-spacing:.2em;font-size:.6rem;font-weight:800}.label-top{top:18%;left:18%}.label-mid{top:48%;left:22%;font-size:1rem;letter-spacing:.11em}.label-bottom{bottom:18%;right:15%}.hero-rail{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid #b7cdc3}.hero-rail a{padding:23px 12px;font-size:.88rem;font-weight:700;border-right:1px solid #b7cdc3;display:flex;justify-content:space-between}.hero-rail a:first-child{padding-left:0}.hero-rail a:last-child{border:0}.hero-rail a:hover{color:var(--teal)}.section{padding-block:105px}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:30px;margin-bottom:38px}.section-heading h2{max-width:700px;margin-bottom:14px}.section-heading p:not(.eyebrow){color:var(--muted);margin:0}.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.card{border:1px solid var(--line);min-height:245px;padding:28px;display:flex;flex-direction:column;transition:transform .2s,box-shadow .2s,border-color .2s;background:#fff}.card:hover{transform:translateY(-4px);border-color:#8bbcaf;box-shadow:0 14px 35px #153c2920}.card .eyebrow{margin-bottom:21px}.card h2,.card h3{font-size:1.55rem;margin-bottom:14px}.card p{color:var(--muted);font-size:.94rem}.card-link{margin-top:auto;font-size:.85rem;color:var(--teal);font-weight:800}.band{background:var(--teal-dark);color:white}.band-inner{padding-block:95px;max-width:1240px}.band .eyebrow{color:var(--accent)}.band h2{max-width:850px}.band p:not(.eyebrow){max-width:590px;color:#d4e5df;font-size:1.1rem}.button-light{background:#d8f1df;color:var(--teal-dark);margin-top:20px}.button-light:hover{background:#fff}.feature-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:20px}.feature-card{background:var(--cream);padding:45px;min-height:360px;display:flex;flex-direction:column}.feature-card h3{font-size:clamp(2rem,3vw,3rem);max-width:520px}.feature-card p{max-width:440px;color:var(--muted)}.feature-card .card-link{margin-top:auto}.article-list a{display:grid;grid-template-columns:1fr 25px;gap:8px;border-bottom:1px solid var(--line);padding:18px 10px}.article-list a:first-child{border-top:1px solid var(--line)}.article-list span{font-size:.68rem;font-weight:750;color:var(--teal);letter-spacing:.12em}.article-list strong{grid-column:1;font-size:1.18rem}.article-list b{grid-column:2;grid-row:1 / span 2;color:var(--teal);font-weight:400}.article-list a:hover strong{color:var(--teal)}.section-tint{background:var(--cream)}.fine-print{font-size:.8rem;color:var(--muted);margin-top:25px}.page-main{min-height:65vh;padding-top:30px;padding-bottom:110px}.breadcrumbs{display:flex;flex-wrap:wrap;gap:10px;font-size:.75rem;color:var(--muted);margin:15px 0 70px}.breadcrumbs a:hover{color:var(--teal)}.page-heading{max-width:970px;margin-bottom:65px}.page-heading h1{font-size:clamp(2.8rem,5vw,5.2rem)}.page-heading .eyebrow{margin-bottom:16px}.content-layout{display:grid;grid-template-columns:minmax(0,750px) minmax(220px,290px);justify-content:space-between;gap:65px}.prose{font-size:1.05rem;color:#283d43}.prose h2{font-size:2rem;margin:2.2em 0 .6em}.prose h3{font-size:1.45rem;margin:1.8em 0 .5em}.prose p{margin-bottom:1.35em}.prose a{color:var(--teal);text-decoration:underline;text-underline-offset:3px}.prose ul,.prose ol{padding-left:1.5em;margin-bottom:1.6em}.prose li{margin:.5em 0}.prose blockquote{border-left:3px solid var(--teal);padding-left:22px;color:var(--muted);margin:35px 0}.prose table{border-collapse:collapse;width:100%;font-size:.9rem;display:block;overflow:auto}.prose th,.prose td{border:1px solid var(--line);padding:10px;text-align:left}.sidebar{align-self:start;background:var(--cream);padding:25px;position:sticky;top:20px}.sidebar a{display:flex;justify-content:space-between;padding:13px 0;border-top:1px solid var(--line);font-size:.88rem;font-weight:700}.sidebar a:hover{color:var(--teal)}.sidebar-note{border-top:1px solid var(--line);padding-top:20px;margin-top:12px;color:var(--muted);font-size:.82rem}.site-footer{background:#092e30;color:#e7f1ed;padding-top:75px}.footer-grid{display:grid;grid-template-columns:2fr repeat(3,1fr);gap:60px;padding-bottom:70px}.footer-grid p{max-width:320px;color:#b6cfca;font-size:.9rem}.footer-brand{font-weight:800;letter-spacing:.1em;display:block;margin-bottom:18px}.footer-brand span{color:#a3dcbd}.footer-grid h2{font-size:.75rem;letter-spacing:.12em;color:#a3dcbd;text-transform:uppercase;margin-bottom:19px}.footer-grid a:not(.footer-brand){display:block;color:#d3e4e0;font-size:.85rem;margin-bottom:11px}.footer-grid a:hover{color:#fff}.footer-bottom{border-top:1px solid #315457;padding:20px 0;display:flex;justify-content:space-between;gap:20px;color:#a9c3bf;font-size:.75rem}.pagination{margin-top:30px}@media(max-width:1000px){.primary-nav{gap:12px}.primary-nav a{font-size:.76rem}.brand small{display:none}.hero-inner{gap:20px}.footer-grid{gap:25px}}@media(max-width:760px){.wrap{width:min(100% - 32px,1240px)}.header-inner{min-height:68px}.brand strong{font-size:.9rem}.menu-toggle{display:block;border:0;background:transparent;color:var(--ink);font:inherit;font-weight:750;cursor:pointer}.primary-nav{display:none;position:absolute;top:100%;left:0;right:0;background:white;padding:15px 16px 25px;box-shadow:0 15px 25px #17322a22;flex-direction:column;align-items:stretch}.primary-nav.is-open{display:flex}.primary-nav a{font-size:1rem;padding:10px}.hero-inner{grid-template-columns:1fr;padding-block:64px}.hero h1{font-size:clamp(2.7rem,11vw,4.3rem)}.hero-graphic{display:none}.hero-rail{grid-template-columns:1fr}.hero-rail a{border-right:0;border-bottom:1px solid #b7cdc3;padding:14px 0}.section{padding-block:65px}.section-heading{align-items:start;flex-direction:column}.card-grid,.feature-grid,.footer-grid{grid-template-columns:1fr}.card{min-height:200px}.feature-card{min-height:330px}.footer-grid{gap:28px}.footer-bottom{flex-direction:column}.content-layout{grid-template-columns:1fr}.sidebar{position:static}.breadcrumbs{margin-bottom:38px}.page-main{padding-bottom:65px}.page-heading{margin-bottom:40px}}
.contact-form{max-width:650px}.contact-form label{display:block;font-weight:700;font-size:.9rem;margin-bottom:7px}.contact-form input,.contact-form textarea,.contact-form select{width:100%;border:1px solid #a7b8b2;border-radius:3px;padding:12px;font:inherit;background:white;color:var(--ink)}.contact-form p{margin-bottom:23px}.contact-form button{border:0;cursor:pointer}.honeypot{position:absolute!important;left:-9999px!important}.form-notice{border-left:4px solid var(--teal);padding:12px;background:var(--pale)}

/* Visual refresh: bundled, responsive imagery and clearer calls to action. */
:root{--ink:#142832;--muted:#52636b;--teal:#075c60;--teal-dark:#073b44;--cream:#f8f5ef;--pale:#e8f1ef;--line:#d9e4e2;--accent:#d8ad73}
.brand-mark{background:#075c60}.nav-cta{background:#075c60;color:#fff!important;border-radius:6px;padding:11px 16px!important;white-space:nowrap}.nav-cta:hover{background:#073b44;color:#fff!important}
.button{border-radius:6px;min-height:48px;box-shadow:0 8px 22px #062f3340;transition:background .2s,transform .2s,box-shadow .2s}.button:hover{transform:translateY(-2px);box-shadow:0 12px 26px #062f334a}.button-light{box-shadow:none}
.hero{color:#fff;background:#0b3039 url('images/hero-hvac.webp') center center/cover no-repeat;position:relative}.hero:before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(4,37,46,.95) 0%,rgba(5,42,49,.9) 37%,rgba(5,42,49,.52) 69%,rgba(5,42,49,.13) 100%);pointer-events:none}.hero-inner,.hero-rail{position:relative;z-index:1}.hero-inner{display:flex;align-items:center;min-height:610px;padding-block:90px}.hero-inner>div:first-child{max-width:760px}.hero h1{font-size:clamp(3.1rem,5.7vw,6.1rem);max-width:750px}.hero h1 em{color:#d8ad73}.hero .eyebrow{color:#e8c99f}.hero-lede{color:#e1eceb;max-width:610px}.hero .button{background:#d8ad73;color:#102d35}.hero .button:hover{background:#efd2a9}.hero .text-link{color:#fff}.hero .text-link:hover{color:#efd2a9}.hero-graphic{display:none}.hero-rail{border-top:1px solid #ffffff63}.hero-rail a{border-color:#ffffff63;background:#092e3573;padding:21px 18px}.hero-rail a:first-child{padding-left:18px}.hero-rail a:hover{background:#0b595db8;color:#fff}
.card{padding:0;overflow:hidden;border-radius:7px;min-height:unset}.card-image{display:block;width:100%;height:190px;object-fit:cover;transition:transform .35s}.card:hover .card-image{transform:scale(1.045)}.card-body{padding:26px 27px 29px;display:flex;flex-direction:column;flex:1}.card .eyebrow{margin-bottom:15px}.card p{margin-bottom:23px}.card-link{display:inline-flex;align-items:center;gap:7px}.card:hover .card-link{color:#073b44}.feature-card{background:linear-gradient(90deg,rgba(5,39,46,.92),rgba(5,39,46,.54)),url('images/heating.webp') center/cover;color:#fff;border-radius:7px}.feature-card .eyebrow{color:#efd2a9}.feature-card p{color:#e2eeeb}.feature-card .card-link{color:#efd2a9}.band{background:linear-gradient(100deg,#073b44ed,#073b44d8),url('images/ventilation.webp') center/cover}.section-tint{background:#f7f6f1}
.page-heading-photo{max-width:none;min-height:390px;display:flex;flex-direction:column;justify-content:center;padding:55px clamp(28px,5vw,70px);border-radius:9px;color:#fff;background-size:cover;background-position:center;position:relative;isolation:isolate;overflow:hidden}.page-heading-photo:before{content:"";position:absolute;z-index:-1;inset:0;background:linear-gradient(90deg,#082e38f2 0%,#082e38d9 50%,#082e3859 100%)}.page-heading-heating{background-image:url('images/heating.webp')}.page-heading-ventilation{background-image:url('images/ventilation.webp')}.page-heading-air-conditioning{background-image:url('images/air-conditioning.webp')}.page-heading-photo .eyebrow{color:#efd2a9}.page-heading-photo .page-lede{color:#e2eeeb;max-width:670px}.page-heading-photo .button{align-self:flex-start;background:#d8ad73;color:#102d35;margin-top:12px}.page-heading-photo .button:hover{background:#efd2a9}
@media(max-width:1050px){.header-inner{gap:18px}.primary-nav{gap:10px}.primary-nav a{font-size:.75rem}.nav-cta{padding:9px 11px!important}}
@media(max-width:760px){.nav-cta{text-align:center}.hero{background-position:61% center}.hero:before{background:linear-gradient(90deg,#082d37ed,#082d37bd)}.hero-inner{min-height:570px;padding-block:72px}.hero-rail a{border-bottom-color:#ffffff55}.card-image{height:210px}.page-heading-photo{min-height:360px;padding:35px 24px}.page-heading-photo:before{background:linear-gradient(90deg,#082e38ef,#082e38ac)}}
@media(prefers-reduced-motion:reduce){.button,.card,.card-image{transition:none}.button:hover,.card:hover,.card:hover .card-image{transform:none}}

.page-heading-photo{background-image:var(--page-photo);background-color:#173c44}.page-heading-photo h1{max-width:850px}.page-heading-photo .page-lede{max-width:650px}@media(max-width:760px){.page-heading-photo{background-position:64% center}}