:root{
  --orange:#ef6a1f;
  --orange-deep:#d4590f;
  --orange-soft:#fff0e6;
  --blue:#0a4e8f;
  --blue-deep:#063764;
  --cyan:#18a8d8;
  --cyan-soft:#e6f6fc;
  --yellow:#f7bc1c;
  --white:#fff;
  --paper:#f6f8fb;
  --paper-2:#eef2f7;
  --line:#dde4ee;
  --line-2:#c6d0de;
  --graphite:#161a20;
  --graphite-2:#1e242d;
  --ink:#16202b;
  --ink-2:#3c4a5a;
  --ink-soft:#697889;
  --ink-faint:#96a3b3;
  --sans:'Inter',system-ui,-apple-system,sans-serif;
  --display:'Archivo','Inter',sans-serif;
  --mono:'IBM Plex Mono','SFMono-Regular',Consolas,monospace;
  --wrap:min(1180px,92vw);
  --radius:4px;
  --shadow:0 18px 50px -24px rgba(16,32,48,.32);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--sans);font-size:16.5px;line-height:1.62;color:var(--ink);background:var(--white);overflow-x:hidden;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
button{border:0;background:none;cursor:pointer}
h1,h2,h3{font-family:var(--display);font-weight:800;line-height:1.02;letter-spacing:-.01em;text-wrap:balance}
:where(a,button,input,select,textarea,summary):focus-visible{outline:3px solid rgba(24,168,216,.78);outline-offset:3px}
.wrap{width:var(--wrap);margin-inline:auto}
.kicker{display:inline-flex;align-items:center;gap:.7rem;font-family:var(--mono);font-size:.74rem;letter-spacing:.16em;text-transform:uppercase;color:var(--orange);font-weight:600}
.kicker::before{content:"";width:28px;height:2px;background:currentColor}
.kicker.light{color:var(--cyan)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.55rem;padding:.92rem 1.45rem;border-radius:var(--radius);font-weight:700;font-size:.94rem;transition:transform .2s,background .2s,color .2s,border-color .2s,box-shadow .2s;white-space:nowrap}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:var(--orange);color:#fff;box-shadow:0 12px 26px -12px rgba(239,106,31,.72)}
.btn-primary:hover{background:var(--orange-deep)}
.btn-light{border:1.5px solid rgba(255,255,255,.46);color:#fff}
.btn-light:hover{background:#fff;color:var(--graphite);border-color:#fff}
.btn-dark{background:var(--graphite);color:#fff}
.btn-dark:hover{background:var(--graphite-2)}
.text-link{font-weight:700;color:var(--orange);border-bottom:1px solid currentColor;padding-bottom:2px}

.site-header{position:fixed;top:0;left:0;right:0;z-index:80;padding:.8rem 0;transition:background .3s,box-shadow .3s,backdrop-filter .3s}
.site-header.scrolled{background:rgba(255,255,255,.94);box-shadow:0 1px 0 var(--line);backdrop-filter:blur(10px)}
.header-wrap{display:flex;align-items:center;justify-content:space-between;gap:1.4rem}
.brand img{height:52px;width:auto}
.nav{display:flex;align-items:center;gap:.85rem}
.nav a{font-size:.8rem;font-weight:650;color:rgba(255,255,255,.86)}
.site-header.scrolled .nav a{color:var(--ink-2)}
.nav a:hover{color:var(--orange)}
.header-actions{display:flex;align-items:center;gap:.7rem}
.wa-mini{display:inline-flex;align-items:center;gap:.45rem;background:rgba(37,211,102,.14);color:#fff;padding:.5rem .8rem;border-radius:9px;font-weight:800}
.site-header.scrolled .wa-mini{color:var(--blue)}
.wa-mini svg{width:22px;height:22px;color:#25d366}
.burger{display:none;width:44px;height:44px;flex-direction:column;align-items:center;justify-content:center;gap:5px}
.burger span{width:24px;height:2px;background:#fff;transition:.25s}
.site-header.scrolled .burger span{background:var(--ink)}
.burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger.open span:nth-child(2){opacity:0}
.burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.mobile-nav{display:none}

.hero{position:relative;min-height:min(860px,92svh);background:var(--graphite);color:#fff;display:flex;align-items:center;overflow:hidden}
.hero-media{position:absolute;inset:0;z-index:0}
.hero-media::after{content:"";position:absolute;inset:0;background:linear-gradient(95deg,rgba(10,12,16,.96) 0%,rgba(10,12,16,.82) 38%,rgba(10,12,16,.42) 68%,rgba(10,12,16,.16) 100%),linear-gradient(0deg,rgba(10,12,16,.62),transparent 38%)}
.hero-media img,.hero-media picture{width:100%;height:100%;object-fit:cover}
.hero-grid{position:relative;z-index:1;padding:7.4rem 0 4.5rem}
.hero-copy{max-width:820px}
.breadcrumbs{display:flex;align-items:center;gap:.55rem;margin-bottom:1.35rem;font-size:.82rem;color:rgba(255,255,255,.7)}
.breadcrumbs a{color:#fff;border-bottom:1px solid rgba(255,255,255,.35)}
.claim{display:inline-flex;background:var(--orange);color:#fff;padding:.48rem .8rem;border-radius:8px;font-weight:800;font-size:.9rem;margin-bottom:1.35rem;box-shadow:0 12px 28px -12px rgba(239,106,31,.8)}
.hero h1{font-size:clamp(2.45rem,4.8vw,4.35rem);max-width:780px;margin-bottom:1.35rem}
.hero p{font-size:clamp(1.04rem,1.5vw,1.24rem);color:rgba(255,255,255,.84);max-width:54ch;font-weight:350}
.hero-line{margin-top:.5rem;color:#fff!important;font-weight:700!important}
.hero-actions{display:flex;flex-wrap:wrap;gap:.85rem;margin:2rem 0 2.2rem}
.proof-list{list-style:none;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:.7rem;max-width:760px}
.proof-list li{border-left:2px solid rgba(255,255,255,.18);padding:.35rem .75rem}
.proof-list b{display:block;color:#fff;font-family:var(--display);font-size:1rem}
.proof-list span{display:block;color:rgba(255,255,255,.66);font-size:.78rem;line-height:1.28}

section{scroll-margin-top:86px}
.section-head{display:grid;grid-template-columns:minmax(0,.9fr) minmax(280px,.8fr);gap:clamp(1.4rem,4vw,3rem);align-items:end;margin-bottom:2rem}
.section-head.compact{display:block;max-width:650px}
.section-head h2{font-size:clamp(2rem,4vw,3.35rem);margin-top:.95rem}
.section-head p{color:var(--ink-2);max-width:60ch}

.price-section{padding:clamp(4rem,8vw,7rem) 0;background:var(--paper)}
.pricing-layout{display:grid;grid-template-columns:.78fr 1.22fr;gap:1.2rem;align-items:stretch}
.price-intro{background:var(--graphite);color:#fff;border-radius:var(--radius);overflow:hidden;display:grid;grid-template-rows:1fr auto;min-height:560px}
.price-intro img{width:100%;height:100%;object-fit:cover;min-height:320px;opacity:.76}
.price-intro div{padding:1.4rem;background:linear-gradient(180deg,rgba(22,26,32,.92),var(--graphite))}
.price-intro span{font-family:var(--mono);font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;color:rgba(255,255,255,.62)}
.price-intro strong{display:block;font-family:var(--display);font-size:clamp(2.4rem,4vw,3.5rem);line-height:1;color:#fff;margin:.35rem 0 .65rem}
.price-intro p{color:rgba(255,255,255,.72)}
.price-tabs{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:clamp(1rem,2.5vw,1.7rem);box-shadow:var(--shadow)}
.tabs{display:flex;gap:.45rem;flex-wrap:wrap;margin-bottom:1.1rem}
.tab{padding:.65rem 1rem;border:1px solid var(--line);border-radius:999px;color:var(--ink-2);font-weight:800;background:var(--paper)}
.tab.is-active{background:var(--ink);color:#fff;border-color:var(--ink)}
.price-panel{display:none}
.price-panel.is-active{display:block}
.price-panel h3{font-size:clamp(1.35rem,2.2vw,1.8rem);margin-bottom:.65rem}
.price-list{list-style:none;border-top:1px solid var(--line)}
.price-list li{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:1.1rem .2rem;border-bottom:1px solid var(--line)}
.price-list b{display:block;font-size:1rem}
.price-list small{display:block;color:var(--ink-soft);font-size:.86rem;margin-top:.12rem}
.price-list strong{font-family:var(--display);font-size:1.35rem;color:var(--orange)}
.price-actions{display:flex;gap:1rem;align-items:center;flex-wrap:wrap;margin-top:1.2rem}

.guide{padding:clamp(4rem,8vw,7rem) 0}
.split{display:grid;grid-template-columns:.85fr 1.15fr;gap:clamp(2rem,6vw,5rem);align-items:start}
.choice-list{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--line);border-left:1px solid var(--line)}
.choice-list article{padding:1.25rem;border-right:1px solid var(--line);border-bottom:1px solid var(--line);background:#fff}
.choice-list span{font-family:var(--mono);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--orange);font-weight:700}
.choice-list h3{font-size:1.35rem;margin:.7rem 0 .5rem}
.choice-list p{color:var(--ink-2)}

.install{padding:clamp(4rem,8vw,7rem) 0;background:var(--graphite);color:#fff}
.install-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:clamp(2rem,6vw,5rem);align-items:start}
.install h2{font-size:clamp(2rem,4vw,3.4rem);margin:1rem 0}
.install p{color:rgba(255,255,255,.72);max-width:50ch}
.install .btn{margin-top:1.4rem}
.process{counter-reset:step;list-style:none;display:grid;gap:.6rem}
.process li{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);padding:1.1rem 1.2rem;display:grid;grid-template-columns:auto 1fr;gap:.8rem;align-items:start}
.process li::before{counter-increment:step;content:"0" counter(step);font-family:var(--mono);color:var(--cyan);font-weight:700}
.process b{display:block;color:#fff}
.process span{display:block;color:rgba(255,255,255,.68)}

.multi{padding:clamp(4rem,8vw,7rem) 0;background:linear-gradient(135deg,var(--blue-deep),var(--graphite));color:#fff;overflow:hidden}
.multi-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(2rem,6vw,5rem);align-items:center}
.multi-card h2{font-size:clamp(2rem,4vw,3.3rem);margin:1rem 0}
.multi-card p{color:rgba(255,255,255,.74);max-width:54ch}
.brand-line{margin:1rem 0 1.4rem;color:#fff!important;font-weight:700}
.ms-diagram{min-height:360px;position:relative;border:1px solid rgba(255,255,255,.16);background:rgba(255,255,255,.06);padding:2rem;display:grid;grid-template-columns:1fr 70px 1fr;align-items:center}
.unit{background:#fff;color:var(--ink);padding:1.1rem 1rem;text-align:center;font-weight:800;border-radius:var(--radius)}
.line{height:2px;background:var(--cyan);position:relative}
.line::before,.line::after{content:"";position:absolute;top:50%;width:48px;height:2px;background:var(--cyan)}
.line::before{right:100%;transform:translateY(-50%) rotate(28deg);transform-origin:right center}
.line::after{left:100%;transform:translateY(-50%) rotate(-28deg);transform-origin:left center}
.indoor-list{display:grid;gap:.7rem}
.indoor-list span{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.18);padding:.8rem 1rem;text-align:center;font-weight:700}

.brands{padding:clamp(4rem,8vw,7rem) 0;background:var(--paper)}
.brand-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:.7rem}
.brand-grid img,.brand-grid span{height:74px;background:#fff;border:1px solid var(--line);display:grid;place-items:center;padding:1rem;object-fit:contain;color:#7c8998;font-family:var(--display);font-weight:800}
.brand-grid img{width:100%}

.support{padding:clamp(4rem,8vw,7rem) 0}
.support-grid{display:grid;grid-template-columns:.95fr 1.05fr;gap:clamp(2rem,6vw,5rem);align-items:center}
.support figure{aspect-ratio:16/11;overflow:hidden;border-radius:var(--radius)}
.support img{width:100%;height:100%;object-fit:cover}
.support h2{font-size:clamp(2rem,4vw,3.2rem);margin:1rem 0}
.support p{color:var(--ink-2)}
.check-list{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:.6rem;margin:1.3rem 0}
.check-list li{background:var(--paper);border:1px solid var(--line);padding:.8rem .9rem;font-weight:700}
.check-list li::before{content:"";display:inline-block;width:9px;height:9px;background:var(--cyan);transform:rotate(45deg);margin-right:.6rem}

.maintenance{padding:clamp(3rem,6vw,5rem) 0;background:var(--orange)}
.maint-box{display:flex;align-items:center;justify-content:space-between;gap:1.5rem;color:#fff}
.maint-box h2{font-size:clamp(1.8rem,3.5vw,2.8rem);margin:.8rem 0 .35rem}
.maint-box p{color:rgba(255,255,255,.88)}

.social{padding:clamp(4rem,8vw,7rem) 0;background:var(--paper)}
.reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;margin-top:1.6rem}
.reviews article{background:#fff;border:1px solid var(--line);padding:1.3rem;border-radius:var(--radius)}
.stars{color:var(--yellow);letter-spacing:.05em}
.reviews blockquote{margin:.8rem 0;color:var(--ink-2)}
.reviews cite{font-style:normal;font-size:.84rem;color:var(--ink-soft);font-weight:700}

.faq{padding:clamp(4rem,8vw,7rem) 0}
.faq-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:clamp(2rem,5vw,4rem)}
.faq-list{display:grid;gap:.55rem}
details{border:1px solid var(--line);background:#fff;border-radius:var(--radius)}
summary{list-style:none;cursor:pointer;padding:1rem 1.1rem;font-weight:800;color:var(--ink)}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";float:right;color:var(--orange);font-size:1.2rem}
details[open] summary::after{content:"−"}
details p{padding:0 1.1rem 1rem;color:var(--ink-2)}

.final-cta{padding:clamp(4rem,8vw,7rem) 0;background:var(--graphite);color:#fff}
.contact-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:clamp(2rem,6vw,5rem);align-items:start}
.final-cta h2{font-size:clamp(2rem,4.6vw,3.7rem);margin:1rem 0}
.final-cta p{color:rgba(255,255,255,.74)}
.contact-data{display:grid;gap:.45rem;margin:1.3rem 0;color:rgba(255,255,255,.78)}
.contact-data b{color:#fff}
.cta-actions{display:flex;flex-wrap:wrap;gap:.8rem}
.quote-form{background:#fff;color:var(--ink);border-radius:var(--radius);padding:clamp(1.1rem,3vw,2rem);box-shadow:0 24px 70px -34px rgba(0,0,0,.7)}
.quote-form h3{font-size:1.45rem;margin-bottom:.25rem}
.quote-form p{color:var(--ink-soft);font-size:.92rem;margin-bottom:1rem}
.quote-form label{display:block;font-size:.78rem;font-weight:800;color:var(--ink-2);margin:.85rem 0 .34rem}
.quote-form input,.quote-form select,.quote-form textarea{width:100%;border:1px solid var(--line-2);border-radius:var(--radius);padding:.82rem .9rem;background:#fff;color:var(--ink)}
.quote-form input:focus,.quote-form select:focus,.quote-form textarea:focus{outline:0;border-color:var(--orange);box-shadow:0 0 0 3px var(--orange-soft)}
.quote-form textarea{resize:vertical;min-height:96px}
.quote-form .btn{width:100%;margin-top:1rem}
.form-note{font-size:.82rem;color:var(--ink-soft);min-height:1.2rem;margin-top:.8rem}

.footer{background:#0f141b;color:rgba(255,255,255,.68);padding:3rem 0 1.4rem}
.footer-grid{display:grid;grid-template-columns:1fr 1.4fr;gap:2rem;align-items:start}
.footer img{height:42px;width:auto;margin-bottom:.8rem}
.footer nav{display:flex;flex-wrap:wrap;gap:.75rem 1.2rem;justify-content:flex-end}
.footer a:hover{color:var(--orange)}
.footer-bottom{width:var(--wrap);margin:2rem auto 0;padding-top:1rem;border-top:1px solid rgba(255,255,255,.1);font-size:.82rem;color:rgba(255,255,255,.45)}
.wa-float{position:fixed;right:1.4rem;bottom:1.4rem;z-index:70;width:58px;height:58px;border-radius:50%;background:#25d366;color:#fff;display:grid;place-items:center;box-shadow:0 12px 28px -8px rgba(37,211,102,.68)}
.wa-float svg{width:31px;height:31px}

@media(max-width:1040px){
  .nav{display:none}
  .burger{display:flex}
  .mobile-nav{position:fixed;top:68px;left:0;right:0;display:grid;gap:.1rem;background:#fff;border-top:1px solid var(--line);box-shadow:0 18px 34px -26px rgba(16,32,48,.5);transform:translateY(-125%);transition:transform .28s;z-index:75;padding:.8rem 4vw}
  .mobile-nav.open{transform:translateY(0)}
  .mobile-nav a{padding:.85rem;border-bottom:1px solid var(--line);font-weight:800}
  .section-head,.pricing-layout,.split,.install-grid,.multi-grid,.support-grid,.faq-grid,.contact-grid{grid-template-columns:1fr}
  .price-intro{min-height:auto}
  .proof-list{grid-template-columns:repeat(2,1fr)}
  .reviews{grid-template-columns:1fr 1fr}
}
@media(max-width:760px){
  body{font-size:16px}
  .brand img{height:40px}
  .site-header{padding:.65rem 0}
  .wa-mini span{font-size:.9rem}
  .hero{min-height:auto}
  .hero-media::after{background:linear-gradient(180deg,rgba(10,12,16,.44) 0%,rgba(10,12,16,.82) 46%,rgba(10,12,16,.96) 100%)}
  .hero-grid{padding:7rem 0 4rem}
  .hero h1{font-size:clamp(2.35rem,12vw,3.6rem);max-width:10ch}
  .hero-actions,.cta-actions,.price-actions{flex-direction:column;align-items:stretch}
  .hero-actions .btn,.cta-actions .btn,.price-actions .btn{width:100%}
  .proof-list{grid-template-columns:1fr 1fr;gap:.4rem}
  .proof-list li{padding:.4rem .55rem}
  .choice-list{grid-template-columns:1fr}
  .price-list li{align-items:flex-start;flex-direction:column;gap:.35rem}
  .ms-diagram{grid-template-columns:1fr;gap:1rem;min-height:auto}
  .line{height:42px;width:2px;margin:auto}
  .line::before,.line::after{display:none}
  .check-list{grid-template-columns:1fr}
  .maint-box{flex-direction:column;align-items:flex-start}
  .maint-box .btn{width:100%}
  .reviews{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .footer nav{justify-content:flex-start}
  .wa-float{display:none}
}
@media(max-width:420px){
  .tabs{display:grid;grid-template-columns:1fr}
  .tab{width:100%}
  .brand-grid{grid-template-columns:1fr 1fr}
}

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

/* -------- Guía BTU → m² -------- */
.btu-guide{padding:clamp(4rem,8vw,6.5rem) 0;background:linear-gradient(180deg,#fff,var(--paper))}
.btu-head{max-width:62ch;margin:0 auto 2.4rem;text-align:center}
.btu-head .kicker{display:inline-block;margin-bottom:.6rem}
.btu-head h2{font-size:clamp(1.9rem,3.4vw,2.8rem);margin-bottom:.75rem}
.btu-head p{color:var(--ink-2);font-size:1rem}
.btu-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(1rem,2vw,1.5rem)}
.btu-tile{position:relative;margin:0;background:#fff;border:1px solid var(--line);overflow:hidden;display:flex;flex-direction:column}
.btu-tile img{width:100%;height:auto;display:block;background:#fff}
.btu-tile figcaption{display:flex;align-items:baseline;justify-content:space-between;gap:1rem;padding:1rem 1.2rem;border-top:1px solid var(--line);font-family:var(--mono);text-transform:uppercase;letter-spacing:.06em;font-size:.82rem;color:var(--ink-2)}
.btu-tile figcaption b{color:var(--ink);font-weight:800;letter-spacing:.08em}
.btu-tile figcaption span{color:var(--orange);font-weight:800}
.btu-note{margin:1.6rem auto 0;max-width:72ch;text-align:center;font-size:.86rem;color:var(--ink-soft);line-height:1.55}
.btu-note b{color:var(--ink-2);font-weight:800}
@media(max-width:720px){
  .btu-grid{grid-template-columns:1fr;gap:.9rem}
  .btu-head{text-align:left;margin-left:0}
  .btu-tile figcaption{padding:.9rem 1rem;font-size:.78rem}
}