:root{
  --navy:#0B1724;
  --navy-2:#112435;
  --ink:#0D1B2A;
  --blue:#276EF1;
  --blue-dark:#1F5DCC;
  --ice:#F5F8FB;
  --white:#FFFFFF;
  --muted:#66788A;
  --line:#DDE5EC;
  --amber:#F4A62A;
  --heat:#F36D3D;
  --green:#18A66B;
  --teal:#2396A2;
  --shadow:0 18px 50px rgba(12,33,50,.10);
  --shell:min(1180px,calc(100% - 40px));
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:#fff;color:var(--ink);font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;line-height:1.5;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid rgba(39,110,241,.35);outline-offset:3px}
.shell{width:var(--shell);margin-inline:auto}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip-link{position:fixed;top:-80px;left:16px;z-index:9999;background:#fff;color:#111;padding:10px 14px;border-radius:10px;box-shadow:var(--shadow)}
.skip-link:focus{top:16px}
.concept-banner{background:#07111a;color:#b8c8d6;text-align:center;font-size:.72rem;padding:7px 16px;letter-spacing:.02em}

.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);border-bottom:1px solid rgba(221,229,236,.9);backdrop-filter:blur(14px)}
.nav-row{min-height:74px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{width:194px;flex:0 0 auto}
.brand img{width:100%}
.desktop-nav{display:flex;gap:23px;align-items:center;font-size:.86rem;font-weight:760;color:#263C4F}
.desktop-nav a:hover{color:var(--blue)}
.nav-actions{display:flex;align-items:center;gap:16px}
.demo-phone{display:flex;gap:8px;align-items:center;font-weight:850;font-size:.9rem}
.phone-icon{font-size:.9rem}
.btn{border:0;border-radius:999px;display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 20px;font-weight:850;transition:transform .2s ease,box-shadow .2s ease,background .2s ease}
.btn:hover{transform:translateY(-1px)}
.btn-blue{background:var(--blue);color:#fff;box-shadow:0 10px 28px rgba(39,110,241,.22)}
.btn-blue:hover{background:var(--blue-dark)}
.btn-large{min-height:54px;padding-inline:24px}
.btn-ghost{border:1px solid rgba(255,255,255,.74);background:rgba(8,22,34,.18);color:#fff}
.btn-white{background:#fff;color:var(--ink)}
.btn-full{width:100%}
.menu-toggle{display:none;background:transparent;border:1px solid var(--line);border-radius:12px;width:48px;height:48px;padding:10px}
.menu-toggle>span:not(.sr-only){display:block;height:2px;background:var(--ink);margin:5px 0;border-radius:2px}
.mobile-nav{background:#fff;border-top:1px solid var(--line);padding:10px 20px 22px}
.mobile-nav a{display:block;padding:12px 0;font-weight:760}
.mobile-nav .btn{width:100%;margin-top:8px}

.hero{position:relative;min-height:590px;display:grid;align-items:center;overflow:hidden;background:var(--navy)}
.hero-image{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(90deg,rgba(5,16,27,.96) 0%,rgba(7,21,35,.90) 38%,rgba(7,21,35,.34) 68%,rgba(7,21,35,.06) 100%)}
.hero-inner{position:relative;z-index:2}
.hero-copy{max-width:680px;padding:76px 0}
.eyebrow{margin:0 0 11px;font-size:.72rem;letter-spacing:.17em;font-weight:900;color:#dbe6ef}
.eyebrow.blue{color:var(--blue)}
.hero h1{font-size:clamp(3.4rem,6.4vw,6.2rem);line-height:.92;letter-spacing:-.057em;color:#fff;margin:0 0 20px}
.hero h1>span:last-child{color:#6FA2FF}
.season-copy{display:none}
body.season-heating .season-heating,
body.season-cooling .season-cooling,
body.season-neutral .season-neutral{display:inline}
.hero-lede{font-size:1.14rem;color:#D7E1E8;max-width:580px;margin:0 0 26px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:28px}
.hero-trust{display:flex;gap:9px;flex-wrap:wrap}
.hero-trust span{border:1px solid rgba(255,255,255,.20);background:rgba(7,20,32,.34);color:#E3EBF1;border-radius:999px;padding:8px 11px;font-size:.78rem;font-weight:720}

.section{padding:86px 0}
.section-heading{max-width:760px;margin-bottom:34px}
.section-heading h2{font-size:clamp(2.5rem,4.7vw,4.7rem);line-height:.98;letter-spacing:-.05em;margin:0 0 13px}
.section-heading>p{color:var(--muted);margin:0}
.section-heading.split{display:grid;max-width:none;grid-template-columns:1fr minmax(280px,440px);gap:48px;align-items:end}
.section-heading.split>p{margin-bottom:5px}

.problem-section{background:var(--ice)}
.problem-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:12px}
.problem-card{appearance:none;border:1px solid var(--line);background:#fff;border-radius:16px;min-height:178px;padding:22px 13px;text-align:center;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:7px;transition:.2s ease;color:var(--ink)}
.problem-card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#C8D8E7}
.problem-card[aria-pressed="true"]{border-color:#A7C4FF;background:#EEF4FF;box-shadow:0 12px 28px rgba(39,110,241,.10)}
.problem-icon{width:50px;height:50px;border-radius:50%;display:grid;place-items:center;font-size:1.4rem;font-weight:900;margin-bottom:3px}
.problem-icon.heat{background:#FFF0EA;color:var(--heat)}
.problem-icon.cool{background:#EAF2FF;color:var(--blue)}
.problem-icon.teal{background:#E9F7F7;color:var(--teal)}
.problem-icon.amber{background:#FFF5E6;color:var(--amber)}
.problem-icon.green{background:#EAF8F1;color:var(--green)}
.problem-icon.blue-soft{background:#EEF4FF;color:var(--blue)}
.problem-card strong{font-size:.94rem;line-height:1.2}
.problem-card small{color:var(--muted);font-size:.77rem;line-height:1.35}
.problem-response{margin-top:16px;border:1px solid var(--line);background:#fff;border-radius:16px;padding:22px 24px;display:grid;grid-template-columns:1fr auto;align-items:center;gap:22px}
.problem-response h3{margin:0 0 6px;font-size:1.3rem}
.problem-response p{margin:0;color:var(--muted)}

.service-split{display:grid;grid-template-columns:1fr 1fr}
.service-visual{position:relative;min-height:510px;overflow:hidden}
.service-visual img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.service-shade{position:absolute;inset:0;background:linear-gradient(90deg,rgba(7,18,28,.82),rgba(7,18,28,.25))}
.service-copy{position:absolute;left:clamp(28px,6vw,72px);bottom:48px;max-width:430px;color:#fff;z-index:2}
.service-copy h2{font-size:clamp(2.3rem,4vw,4.4rem);line-height:.98;letter-spacing:-.05em;margin:0 0 12px}
.service-copy p{color:#E1E8ED;margin:0 0 22px;max-width:370px}

.trust-row{border-bottom:1px solid var(--line);background:#fff}
.trust-row-inner{display:grid;grid-template-columns:repeat(4,1fr)}
.trust-row article{display:flex;align-items:flex-start;gap:13px;padding:26px 18px;border-right:1px solid var(--line)}
.trust-row article:first-child{padding-left:0}
.trust-row article:last-child{border-right:0}
.trust-icon{width:38px;height:38px;flex:0 0 38px;border:1px solid #BBD0FF;border-radius:50%;display:grid;place-items:center;color:var(--blue);font-weight:900}
.trust-row strong,.trust-row small{display:block}
.trust-row strong{font-size:.88rem;margin-bottom:4px}
.trust-row small{color:var(--muted);font-size:.76rem;line-height:1.4}

.diagnosis-section{background:#fff}
.diagnosis-grid{display:grid;grid-template-columns:1fr 1fr;align-items:stretch;gap:0;border:1px solid var(--line);border-radius:22px;overflow:hidden;box-shadow:var(--shadow)}
.diagnosis-image{min-height:540px}
.diagnosis-image img{width:100%;height:100%;object-fit:cover}
.diagnosis-copy{padding:clamp(38px,6vw,74px);display:flex;flex-direction:column;justify-content:center}
.diagnosis-copy h2{font-size:clamp(2.6rem,4.6vw,4.7rem);line-height:.98;letter-spacing:-.052em;margin:0 0 18px}
.diagnosis-copy>p{color:var(--muted);font-size:1.02rem}
.check-list{list-style:none;padding:0;margin:16px 0 26px;display:grid;gap:10px}
.check-list li{position:relative;padding-left:28px}
.check-list li::before{content:"✓";position:absolute;left:0;color:var(--blue);font-weight:900}

.decision-section{background:var(--ice)}
.decision-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:18px}
.repair-replace-card,.feature-promo{background:#fff;border:1px solid var(--line);border-radius:18px;overflow:hidden}
.repair-replace-card{padding:32px}
.repair-replace-card h2{font-size:clamp(2.35rem,4vw,4rem);line-height:1;letter-spacing:-.045em;margin:0 0 10px}
.subcopy{color:var(--muted)}
.decision-columns{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin:26px 0}
.decision-columns>div:first-child{padding-right:24px;border-right:1px solid var(--line)}
.decision-columns h3{font-size:.92rem;margin:0 0 12px}
.decision-columns ul{padding:0;margin:0;list-style:none;display:grid;gap:8px}
.decision-columns li{position:relative;padding-left:22px;color:#475D70;font-size:.88rem}
.decision-columns li::before{content:"✓";position:absolute;left:0;color:var(--teal);font-weight:900}
.stacked-cards{display:grid;grid-template-rows:1fr 1fr;gap:18px}
.feature-promo{display:grid;grid-template-columns:1.05fr .95fr;min-height:260px}
.promo-copy{padding:28px;display:flex;flex-direction:column;justify-content:center}
.promo-copy h3{font-size:1.55rem;line-height:1.05;margin:0 0 9px}
.promo-copy p{color:var(--muted);font-size:.86rem}
.promo-copy a{color:var(--blue);font-weight:850;font-size:.86rem;margin-top:auto}
.feature-promo img{width:100%;height:100%;object-fit:cover}

.proof-section{background:#fff}
.proof-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.proof-grid article{border:1px solid var(--line);border-radius:16px;padding:26px;background:#fff}
.proof-grid span{color:var(--blue);font-size:.78rem;font-weight:900}
.proof-grid h3{font-size:1.16rem;margin:15px 0 8px}
.proof-grid p{color:var(--muted);margin:0}

.skyline-cta{position:relative;min-height:340px;display:grid;align-items:center;overflow:hidden;background:var(--navy);color:#fff}
.skyline-cta>img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.skyline-overlay{position:absolute;inset:0;background:linear-gradient(90deg,rgba(7,18,30,.88),rgba(7,18,30,.60),rgba(7,18,30,.25))}
.skyline-inner{position:relative;z-index:2;display:grid;grid-template-columns:1fr auto;gap:40px;align-items:end;padding-block:66px}
.skyline-inner h2{font-size:clamp(2.6rem,5vw,5rem);line-height:.98;letter-spacing:-.05em;margin:0 0 10px}
.skyline-inner p{color:#D6E1E8;margin:0}
.skyline-actions{display:flex;gap:12px;flex-wrap:wrap;justify-content:flex-end}

.site-footer{background:#08131D;color:#fff;padding:56px 0 26px}
.footer-grid{display:grid;grid-template-columns:1.4fr .7fr .7fr 1.2fr;gap:44px}
.footer-brand img{width:220px;background:#fff;border-radius:10px;padding:7px 10px;margin-bottom:14px}
.site-footer h3{font-size:.85rem;margin-top:0}
.site-footer p,.site-footer a{color:#9DAEBA;font-size:.84rem}
.site-footer a{display:block;margin:8px 0}
.site-footer a:hover{color:#fff}
.footer-bottom{margin-top:34px;padding-top:20px;border-top:1px solid #22313D;display:flex;justify-content:space-between;gap:20px;color:#7F919D;font-size:.76rem}

.mobile-action-bar{display:none}

.booking-dialog{border:0;padding:0;background:transparent;width:min(760px,calc(100% - 28px));max-width:none}
.booking-dialog::backdrop{background:rgba(5,15,24,.76);backdrop-filter:blur(5px)}
.booking-card{position:relative;background:#fff;border-radius:22px;padding:34px;box-shadow:0 30px 80px rgba(0,0,0,.28)}
.dialog-close{position:absolute;right:16px;top:14px;width:40px;height:40px;border:0;border-radius:50%;background:#EDF2F6;font-size:1.5rem;color:var(--ink)}
.booking-card h2{font-size:clamp(2.2rem,5vw,3.8rem);letter-spacing:-.045em;line-height:1;margin:0 0 11px}
.dialog-intro{color:var(--muted)}
.booking-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:22px 0 14px}
.booking-card label span{display:block;font-size:.77rem;color:#4E6373;font-weight:850;margin-bottom:6px}
.booking-card input,.booking-card select,.booking-card textarea{width:100%;border:1px solid #D6E0E7;border-radius:10px;background:#FBFCFD;color:var(--ink);padding:13px}
.booking-card input,.booking-card select{min-height:50px}
.booking-card textarea{resize:vertical;margin-bottom:14px}
.form-disclaimer,.form-status{text-align:center;font-size:.76rem;color:#778995;margin:10px 0 0}
.form-status{color:var(--blue);font-weight:800}

@media(max-width:1020px){
  .desktop-nav,.nav-actions{display:none}
  .menu-toggle{display:block}
  .hero{min-height:560px}
  .problem-grid{grid-template-columns:repeat(3,1fr)}
  .trust-row-inner{grid-template-columns:1fr 1fr}
  .trust-row article:nth-child(2){border-right:0}
  .trust-row article:nth-child(-n+2){border-bottom:1px solid var(--line)}
  .diagnosis-grid{grid-template-columns:1fr}
  .diagnosis-image{min-height:420px}
  .decision-grid{grid-template-columns:1fr}
  .feature-promo{min-height:250px}
  .footer-grid{grid-template-columns:1.3fr 1fr 1fr}
  .footer-grid>div:last-child{grid-column:2/4}
}

@media(max-width:760px){
  :root{--shell:min(100% - 28px,650px)}
  .concept-banner{font-size:.67rem}
  .nav-row{min-height:66px}
  .brand{width:170px}
  .hero{min-height:650px;align-items:end}
  .hero-image{object-position:61% center}
  .hero-overlay{background:linear-gradient(0deg,rgba(5,16,27,.97) 0%,rgba(5,16,27,.78) 56%,rgba(5,16,27,.15) 100%)}
  .hero-copy{padding:210px 0 48px}
  .hero h1{font-size:clamp(3rem,13vw,4.7rem)}
  .hero-lede{font-size:1rem}
  .hero-actions{display:grid;grid-template-columns:1fr}
  .hero-actions .btn{width:100%}
  .hero-trust{gap:6px}
  .section{padding:62px 0}
  .section-heading.split{display:block}
  .section-heading.split>p{margin-top:14px}
  .section-heading h2{font-size:clamp(2.4rem,10vw,3.7rem)}
  .problem-grid{grid-template-columns:1fr 1fr;gap:10px}
  .problem-card{min-height:160px;padding:18px 10px}
  .problem-response{grid-template-columns:1fr}
  .problem-response .btn{width:100%}
  .service-split{grid-template-columns:1fr}
  .service-visual{min-height:500px}
  .service-copy{left:24px;right:24px;bottom:34px}
  .trust-row-inner{grid-template-columns:1fr}
  .trust-row article{border-right:0!important;border-bottom:1px solid var(--line)!important;padding:18px 0}
  .trust-row article:last-child{border-bottom:0!important}
  .diagnosis-image{min-height:360px}
  .diagnosis-copy{padding:34px 24px}
  .decision-columns{grid-template-columns:1fr}
  .decision-columns>div:first-child{padding-right:0;padding-bottom:20px;border-right:0;border-bottom:1px solid var(--line)}
  .feature-promo{grid-template-columns:1fr;min-height:0}
  .feature-promo img{height:230px}
  .proof-grid{grid-template-columns:1fr}
  .skyline-cta{min-height:430px}
  .skyline-inner{grid-template-columns:1fr;align-items:end;padding-block:55px}
  .skyline-actions{display:grid;grid-template-columns:1fr;justify-content:stretch}
  .skyline-actions .btn{width:100%}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
  .footer-grid>div:last-child{grid-column:1/-1}
  .footer-bottom{flex-direction:column}
  .booking-grid{grid-template-columns:1fr}
  .booking-card{padding:28px 20px}
  .mobile-action-bar{position:fixed;z-index:95;left:10px;right:10px;bottom:10px;display:grid;grid-template-columns:1fr 1fr;border-radius:14px;overflow:hidden;box-shadow:0 16px 36px rgba(4,16,26,.26);border:1px solid rgba(255,255,255,.15)}
  .mobile-action-bar button,.mobile-action-bar a{border:0;min-height:52px;display:grid;place-items:center;font-weight:900}
  .mobile-action-bar button{background:var(--blue);color:#fff}
  .mobile-action-bar a{background:var(--navy);color:#fff}
  body{padding-bottom:74px}
}

@media(max-width:420px){
  .problem-grid{grid-template-columns:1fr 1fr}
  .problem-card{min-height:150px}
  .hero-trust span{font-size:.72rem}
}

@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
}