:root{
  --bg:#E6E6E4;
  --surface:#F8F8F6;
  --ink:#15171A;
  --muted:#5C5F63;
  --line:#CBCCCA;
  --climate:#123B57;
  --climate-deep:#0B2740;
  --climate-tint:#DCE6EC;
  --fire:#7E1B14;
  --fire-deep:#4E0F0A;
  --fire-tint:#EDDBD7;
}

*{box-sizing:border-box}
html,body{margin:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:'IBM Plex Sans',sans-serif;-webkit-font-smoothing:antialiased;display:flex;flex-direction:column;min-height:100vh}
h1,h2,h3{font-family:'Archivo',sans-serif;margin:0;letter-spacing:-0.015em}
p{margin:0}
a{color:inherit;text-decoration:none}
button{font-family:inherit;background:none;border:none;padding:0;margin:0;color:inherit;cursor:pointer}
img{max-width:100%;display:block}

.wrap{max-width:1160px;margin:0 auto;padding:0 40px;width:100%}
.center{text-align:center}
.eyebrow{font-size:13px;font-weight:600;letter-spacing:0.06em;text-transform:uppercase;color:var(--muted)}
.eyebrow-climate{color:var(--climate-deep)}
.eyebrow-fire{color:var(--fire-deep)}
.h2{font-size:36px;line-height:1.1;margin-top:14px}
.max-copy{max-width:640px}
.lead{margin-top:16px;font-size:16px;line-height:1.6;color:var(--muted)}
.max-lead{max-width:600px}
.slide-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}

.cta{display:inline-flex;align-items:center;background:var(--ink);color:var(--surface);padding:14px 28px;border-radius:4px;font-weight:600;font-size:15px;cursor:pointer;transition:background .15s ease;border:none}
.cta:hover{background:#000}

/* HEADER */
.site-header{position:sticky;top:0;z-index:30;background:rgba(230,230,228,0.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{display:flex;align-items:center;gap:10px}
.brand-logo{height:40px;width:auto;display:block}
.nav-items{display:flex;align-items:center;gap:34px}
.nav-link{color:var(--muted);font-weight:500;font-size:15px}
.nav-link:hover{color:var(--ink)}

/* HERO: dos paneles */
.hero{display:grid;grid-template-columns:1fr 1fr;height:min(82vh,680px);min-height:520px}
.panel{position:relative;display:flex;align-items:flex-end;overflow:hidden;color:#fff}
.panel-climate{background:linear-gradient(160deg,#0B2740 0%,#123B57 60%,#1B4E70 100%)}
.panel-fire{background:#4E0F0A}
.panel-grid-lines{position:absolute;inset:0;background-image:repeating-linear-gradient(0deg,rgba(255,255,255,0.05) 0 1px,transparent 1px 56px),repeating-linear-gradient(90deg,rgba(255,255,255,0.05) 0 1px,transparent 1px 56px)}
.panel-scrim{position:absolute;inset:0;background:linear-gradient(0deg, rgba(60,10,6,0.9) 0%, rgba(60,10,6,0.55) 45%, rgba(60,10,6,0.25) 100%)}
.panel-scrim-climate{background:linear-gradient(0deg, rgba(11,39,64,0.92) 0%, rgba(11,39,64,0.6) 45%, rgba(11,39,64,0.28) 100%)}
.hero-slides{position:absolute;inset:0}
.hero-slide{position:absolute;inset:0;opacity:0;transition:opacity 1s ease}
.hero-slide.is-active{opacity:1}
.panel-copy{position:relative;padding:56px 56px 64px;max-width:560px}
.panel-eyebrow{font-size:14px;font-weight:600;letter-spacing:0.04em;color:rgba(255,255,255,0.72)}
.panel-title{font-size:46px;line-height:1.05;margin-top:12px}
.panel-desc{margin-top:14px;font-size:17px;line-height:1.5;color:rgba(255,255,255,0.88)}
.panel-link{display:inline-block;margin-top:22px;font-weight:600;font-size:15px;border-bottom:1px solid rgba(255,255,255,0.6);padding-bottom:3px;transition:transform .2s ease}
.panel:hover .panel-link{transform:translateX(6px)}

/* MENSAJE PRINCIPAL */
.main-message{padding:104px 0 80px}
.h1-main{font-size:44px;line-height:1.1;max-width:820px;margin:0 auto}
.main-sub{margin:22px auto 0;font-size:18px;line-height:1.55;color:var(--muted);max-width:640px}
.main-cta{margin-top:34px}

/* DISEÑO · INSTALACIÓN · MONTAJE */
.pillars-section{padding:0 0 104px}
.pillars{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:48px;border-top:1px solid var(--line);padding-top:56px}
.pillars .pillar{text-align:center}
.pillars .pillar svg{margin:0 auto}
.pillars .pillar h3{font-size:20px;margin-top:18px}
.pillars .pillar p{margin-top:8px;color:var(--muted);font-size:15px;line-height:1.55}

/* QUIÉNES SOMOS */
.quienes-section{padding:96px 0;background:var(--surface)}
.quienes-grid{display:grid;grid-template-columns:0.9fr 1.1fr;gap:80px;align-items:start}
.quienes-items{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 40px}
.subitem{padding:14px 0;border-top:1px solid var(--line)}
.quienes-items .subitem h3{font-size:16px}
.quienes-items .subitem p{margin-top:6px;color:var(--muted);font-size:14px;line-height:1.5}
.subitem-title{font-weight:600;font-size:14px}
.subitem-desc{margin-top:3px;color:var(--muted);font-size:14px;line-height:1.5}

/* CLIMATIZACIÓN / INCENDIOS */
.climate-section{background:var(--climate-tint);padding:96px 0}
.fire-section{background:var(--fire-tint);padding:96px 0}

/* MASTER-DETAIL */
.md{display:grid;grid-template-columns:320px minmax(0,1fr);gap:40px;margin-top:52px;align-items:start}
.md-list{display:flex;flex-direction:column}
.md-item{display:block;width:100%;text-align:left;padding:18px 22px;border-radius:0 8px 8px 0;margin-bottom:8px;cursor:pointer;transition:background .15s ease;background:transparent;border-left:4px solid transparent}
.md-item:hover{background:rgba(248,248,246,0.6)}
.md-item.is-selected{background:#F8F8F6}
.climate-section .md-item.is-selected{border-left-color:var(--climate)}
.fire-section .md-item.is-selected{border-left-color:var(--fire)}
.md-item-title{display:block;font-family:'Archivo',sans-serif;font-weight:700;font-size:18px}
.md-item-short{display:block;margin-top:4px;color:var(--muted);font-size:14px;line-height:1.4}

.md-panels{position:relative}
.md-detail{display:none;background:var(--surface);border-radius:10px;overflow:hidden}
.md-detail.is-active{display:block}
.md-photo{position:relative;height:300px;overflow:hidden}
.md-photo-caption{position:absolute;inset:0;display:flex;align-items:flex-end;pointer-events:none}
.md-photo-caption p{padding:16px 20px;width:100%;color:#F5F2EA;font-size:13px;font-weight:500}
.climate-section .md-photo-caption p{background:linear-gradient(0deg, rgba(11,39,64,0.75), rgba(11,39,64,0))}
.fire-section .md-photo-caption p{background:linear-gradient(0deg, rgba(78,15,10,0.78), rgba(78,15,10,0))}
.md-body{padding:30px 32px 34px}
.md-body h3{font-size:24px}
.md-long{margin-top:10px;color:var(--muted);font-size:15px;line-height:1.6}
.md-subitems{margin-top:20px}

/* CARRUSEL DE FOTOS */
.photo-carousel{position:relative;height:100%;overflow:hidden}
.photo-carousel-track{position:absolute;inset:0}
.photo-carousel-slide{position:absolute;inset:0;opacity:0;transition:opacity .4s ease}
.photo-carousel-slide.is-active{opacity:1}
.arrow{position:absolute;top:50%;transform:translateY(-50%);width:36px;height:36px;display:flex;align-items:center;justify-content:center;cursor:pointer;z-index:5;filter:drop-shadow(0 1px 3px rgba(0,0,0,0.7))}
.arrow:hover{background:rgba(255,255,255,0.15);border-radius:50%}
.arrow-low{top:auto;bottom:52px;transform:none}
.carousel-prev{left:10px}
.carousel-next{right:10px}
.arrow-circle{position:absolute;width:40px;height:40px;border-radius:50%;background:rgba(248,248,246,0.96);display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 4px 12px rgba(0,0,0,0.18);z-index:5}
.arrow-circle:hover{background:#fff}
.dot{width:8px;height:8px;border-radius:50%;cursor:pointer;padding:0;background:rgba(255,255,255,0.5);border:none}
.dot.is-active{background:#F5F2EA}
.carousel-dots{position:absolute;bottom:14px;right:16px;display:flex;gap:6px;z-index:5}
.carousel-dots.dots-top{top:14px;bottom:auto}

/* OBRAS */
.obras-section{padding:96px 0 40px}
.obras-wrap{position:relative;margin-top:48px}
.obra-scroll{display:flex;gap:24px;overflow-x:auto;scroll-snap-type:x proximity;padding:4px 4px 16px;scrollbar-width:thin;scrollbar-color:var(--line) transparent}
.obra-scroll::-webkit-scrollbar{height:8px}
.obra-scroll::-webkit-scrollbar-thumb{background:var(--line);border-radius:4px}
.project-card{background:var(--surface);border-radius:10px;overflow:hidden}
.obra-card{flex:0 0 calc(50% - 12px);min-width:300px;scroll-snap-align:start}
.obra-photo{position:relative;height:280px}
.obra-photo-placeholder{display:flex;align-items:flex-end}
.obra-caption{width:100%}
.obra-caption p{padding:14px 18px;background:linear-gradient(0deg, rgba(21,23,26,0.6), rgba(21,23,26,0));width:100%;color:#F5F2EA;font-size:13px;font-weight:500}
.obra-info{padding:24px 26px 28px}
.obra-client{font-weight:600;font-size:15px}
.obra-desc{margin-top:8px;color:var(--muted);font-size:14px;line-height:1.55}
.obra-prev{left:-20px;top:130px}
.obra-next{right:-20px;top:130px}

/* CLIENTES */
.clientes-section{padding:48px 0 96px}
.clientes-grid{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:16px;margin-top:20px}
.cliente-logo{height:72px;display:flex;align-items:center;justify-content:center;background:var(--surface);border-radius:6px;font-family:'Archivo',sans-serif;font-weight:700;font-size:17px}
.cliente-placeholder{height:72px;display:flex;align-items:center;justify-content:center;border:1px dashed var(--line);border-radius:6px;font-size:12px;color:var(--muted);text-align:center}

/* CONTACTO */
.contact-section{background:var(--surface);padding:96px 0}
.contact-grid{display:grid;grid-template-columns:0.8fr 1.2fr;gap:80px;align-items:start}
.contact-note{margin-top:14px;color:var(--muted);font-size:14px;line-height:1.6}
.contact-data{margin-top:28px;font-size:14px;line-height:1.9;color:var(--muted)}
.contact-data a:hover{color:var(--ink);text-decoration:underline}
.contact-form{display:flex;flex-direction:column;gap:20px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.field label{display:block;font-size:13px;font-weight:600;color:var(--muted);margin-bottom:6px}
.field input,.field select,.field textarea{width:100%;font-family:inherit;font-size:15px;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:4px;padding:12px 14px}
.field input:focus,.field select:focus,.field textarea:focus{outline:2px solid var(--ink);outline-offset:1px}
.form-actions{display:flex;align-items:center;gap:20px;flex-wrap:wrap}
.form-hint{font-size:13px;color:var(--muted)}
.contact-submit:disabled{opacity:.6;cursor:not-allowed}
.form-status{font-size:14px;min-height:20px}
.form-status.is-success{color:#1a6b3c}
.form-status.is-error{color:var(--fire)}

/* FOOTER */
.site-footer{background:var(--ink);color:#F1EFEA;padding:56px 0 40px;margin-top:auto}
.footer-top{display:flex;flex-wrap:wrap;justify-content:space-between;gap:32px}
.footer-brand-block{max-width:420px}
.footer-logo{height:64px;width:auto;display:block}
.footer-desc{margin-top:16px;font-size:14px;line-height:1.6;color:#B0B0AE}
.footer-nav{display:flex;gap:28px;flex-wrap:wrap;align-items:flex-start}
.footer-link{color:#CACAC8;font-size:14px}
.footer-link:hover{color:#fff}
.footer-copy{margin-top:40px;padding-top:20px;border-top:1px solid #34373B;font-size:13px;color:#8E8F8D}

/* WHATSAPP FLOAT */
.whatsapp-float{position:fixed;right:20px;bottom:110px;width:56px;height:56px;border-radius:50%;background:#25D366;display:flex;align-items:center;justify-content:center;box-shadow:0 8px 20px rgba(0,0,0,0.28);z-index:40;transition:transform .15s ease;font-size:24px;line-height:1}
.whatsapp-float:hover{transform:scale(1.06)}

@media (max-width:900px){
  .nav-items{display:none !important}
  .hero{grid-template-columns:1fr !important;height:auto !important}
  .panel{min-height:380px}
  .panel-copy{padding:40px 24px 48px}
  .panel-title{font-size:36px}
  .grid-2,.grid-3,.md,.form-grid,.quienes-items,.pillars,.contact-grid,.quienes-grid{grid-template-columns:1fr !important;gap:32px}
  .wrap{padding:0 24px}
  .obra-card{flex:0 0 85% !important}
  .h1-main{font-size:32px !important}
  .h2{font-size:28px}
  .clientes-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .obra-prev,.obra-next{display:none}
  .md-list{margin-bottom:8px}
}