/* =========================================================
   CBA de Monterrey — Calentadores para Alberca
   Design tokens — identidad CBA: azul + blanco + carbón
   (WhatsApp conserva su verde de marca)
   ========================================================= */
:root{
  --blue:#016BAA;
  --blue-deep:#014F80;
  --blue-pale:#E7F1F8;
  --charcoal:#181919;
  --charcoal-soft:#2A2C2D;
  --white:#FFFFFF;
  --paper:#F4F7FA;
  --ink:#181919;
  --ink-soft:#4B5457;
  --onDark:#FFFFFF;
  --onDark-muted:#B9C3C7;
  --onDark-blue-tint:#BFE0F5;
  --wa-green:#25D366;
  --wa-green-dark:#1EBE58;
  --radius-sm:10px;
  --radius-md:16px;
  --radius-lg:28px;
  --shadow-card:0 12px 28px -14px rgba(24,25,25,0.24);
  --maxw:1180px;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;overflow-x:hidden;width:100%;}
body{
  margin:0;
  font-family:'Work Sans',system-ui,sans-serif;
  color:var(--ink);
  background:var(--white);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  width:100%;
}
h1,h2,h3{
  font-family:'Space Grotesk',system-ui,sans-serif;
  margin:0 0 0.4em;
  line-height:1.08;
  letter-spacing:-0.01em;
  font-weight:700;
}
h2{font-size:clamp(1.7rem,3.2vw,2.5rem);}
h3{font-size:1.15rem;font-weight:600;}
p{line-height:1.6;margin:0 0 1em;color:var(--ink-soft);}
a{color:inherit;}
img{max-width:100%;display:block;}
ul{margin:0;padding:0;list-style:none;}
button{font-family:inherit;}

@media (prefers-reduced-motion: reduce){
  *{animation-duration:0.001ms !important;animation-iteration-count:1 !important;transition-duration:0.001ms !important;scroll-behavior:auto !important;}
}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px;}

.onDark{color:var(--onDark);}
p.onDark{color:var(--onDark-muted);}

/* =============== BUTTONS =============== */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  font-weight:600;
  font-size:0.98rem;
  padding:14px 26px;
  border-radius:999px;
  border:1px solid transparent;
  cursor:pointer;
  text-decoration:none;
  transition:transform .15s ease, box-shadow .15s ease, background .15s ease;
  max-width:100%;
  text-align:center;
}
.btn:focus-visible{outline:3px solid var(--blue);outline-offset:2px;}

/* WhatsApp = siempre verde de marca, nunca azul CBA */
.btn-wa{
  background:var(--wa-green);
  color:#fff;
  box-shadow:0 10px 24px -10px rgba(37,211,102,0.5);
}
.btn-wa:hover{background:var(--wa-green-dark);transform:translateY(-1px);}

/* Azul CBA = identidad, usado en botones secundarios/estructurales */
.btn-blue{
  background:var(--blue);
  color:#fff;
  box-shadow:0 10px 24px -10px rgba(1,107,170,0.5);
}
.btn-blue:hover{background:var(--blue-deep);transform:translateY(-1px);}

.btn-outline{
  background:transparent;
  border-color:rgba(255,255,255,0.5);
  color:var(--onDark);
}
.btn-outline:hover{border-color:#fff;background:rgba(255,255,255,0.08);}
.btn-outline-sm{
  background:transparent;
  border-color:var(--blue);
  color:var(--blue);
  padding:10px 18px;
  font-size:0.9rem;
  border-radius:999px;
  cursor:pointer;
}
.btn-outline-sm:hover{background:var(--blue);color:#fff;}
.btn-large{padding:16px 30px;font-size:1.02rem;}
.btn-xl{padding:20px 40px;font-size:1.1rem;}
.btn-small{padding:9px 16px;font-size:0.85rem;}
.btn-full{width:100%;}
.ico-wa{width:20px;height:20px;fill:currentColor;flex-shrink:0;}

.link-wa{
  background:none;
  border:none;
  padding:0;
  margin-top:6px;
  color:var(--wa-green-dark);
  font-weight:600;
  font-size:0.92rem;
  cursor:pointer;
  border-bottom:1px solid transparent;
}
.link-wa:hover{border-bottom-color:var(--wa-green-dark);}
.cat-card-lg .link-wa{color:#fff;border-bottom-color:rgba(255,255,255,0.4);}
.cat-card-lg .link-wa:hover{border-bottom-color:#fff;}

/* =============== HEADER =============== */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(24,25,25,0.94);
  backdrop-filter:blur(8px);
  border-bottom:1px solid rgba(255,255,255,0.08);
}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;
  gap:12px;padding:12px 20px;
}
.brand{min-width:0;flex-shrink:1;}
.brand-logo{height:28px;width:auto;max-width:100%;}
.header-phone{
  display:none;
  color:var(--onDark-muted);
  font-size:0.92rem;
  text-decoration:none;
  white-space:nowrap;
}
@media (min-width:640px){.header-phone{display:inline;}}
@media (max-width:480px){
  .header-inner .btn-small span{display:none;}
  .header-inner .btn-small{padding:11px;border-radius:50%;}
  .header-inner .btn-small .ico-wa{width:20px;height:20px;}
}

/* =============== HERO (fotografía real protagonista) =============== */
.hero{
  position:relative;
  overflow:hidden;
  color:var(--onDark);
  min-height:640px;
  display:flex;
  align-items:flex-end;
}
.hero-photo{
  position:absolute;inset:0;
  width:100%;height:100%;
  object-fit:cover;
  object-position:center 40%;
  z-index:0;
}
.hero-scrim{
  position:absolute;inset:0;
  background:
    linear-gradient(90deg, rgba(4,20,28,0.88) 0%, rgba(4,20,28,0.72) 32%, rgba(4,20,28,0.30) 62%, rgba(4,20,28,0.10) 100%),
    linear-gradient(0deg, rgba(1,18,26,0.55) 0%, rgba(1,18,26,0) 40%);
  z-index:1;
}
.hero-inner{
  position:relative;z-index:2;
  width:100%;
  padding:150px 0 64px;
}
.hero-copy{max-width:620px;}
.hero-copy h1{color:var(--onDark);font-size:clamp(2.2rem,5vw,3.5rem);}
.hero-sub{
  color:var(--onDark-blue-tint);
  font-family:'Space Grotesk',sans-serif;
  font-size:clamp(1.1rem,2vw,1.4rem);
  font-weight:600;
  margin:0 0 0.6em;
}
.hero-support{color:var(--onDark-muted);max-width:46ch;}
.hero-ctas{display:flex;flex-wrap:wrap;gap:14px;margin:24px 0 30px;}
.hero-trust{
  display:flex;flex-wrap:wrap;gap:10px 22px;
  font-size:0.85rem;color:var(--onDark-muted);
}
.hero-trust li{position:relative;padding-left:16px;}
.hero-trust li::before{
  content:'';position:absolute;left:0;top:0.45em;
  width:7px;height:7px;border-radius:50%;background:var(--blue);
}

.hero-badge{
  position:absolute;z-index:2;
  right:5%;bottom:14%;
  background:rgba(255,255,255,0.14);
  border:1px solid rgba(255,255,255,0.3);
  backdrop-filter:blur(10px);
  border-radius:14px;
  padding:14px 20px;
  display:flex;flex-direction:column;gap:2px;
}
.hero-badge .stat-num{font-family:'Space Grotesk',sans-serif;color:#fff;font-weight:700;font-size:1.2rem;}
.hero-badge .stat-label{color:var(--onDark-muted);font-size:0.76rem;max-width:18ch;}
@media (max-width:760px){
  .hero{min-height:560px;}
  .hero-inner{padding:120px 0 48px;}
  .hero-badge{display:none;}
}

/* =============== SECTIONS =============== */
.section{padding:76px 0;}
.section-paper{background:var(--paper);}
.section-white{background:var(--white);}
.section-dark{background:var(--charcoal);}
.section-blue{background:linear-gradient(155deg,var(--blue),var(--blue-deep));}
.section-final{
  position:relative;
  overflow:hidden;
  text-align:center;
  color:var(--onDark);
}
.section-final .final-photo{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center 55%;z-index:0;
}
.section-final .final-scrim{
  position:absolute;inset:0;z-index:1;
  background:linear-gradient(180deg, rgba(1,18,26,0.85) 0%, rgba(1,25,38,0.90) 55%, rgba(1,15,22,0.94) 100%);
}
.section-final .final-inner{position:relative;z-index:2;}
.section-lead{max-width:60ch;font-size:1.05rem;}
.section-lead.onDark{color:var(--onDark-muted);}
.center-cta{text-align:center;margin-top:36px;}

/* Divisor fotográfico entre secciones */
.photo-divider{
  position:relative;
  height:260px;
  overflow:hidden;
}
.photo-divider img{
  width:100%;height:100%;object-fit:cover;object-position:center 45%;
}
.photo-divider::after{
  content:'';position:absolute;inset:0;
  background:linear-gradient(180deg, rgba(1,18,26,0.45) 0%, rgba(1,18,26,0.15) 50%, rgba(1,18,26,0.45) 100%);
}
@media (max-width:640px){.photo-divider{height:170px;}}

/* =============== CATEGORIAS =============== */
.cat-grid{
  display:grid;
  grid-template-columns:1.3fr 1fr 1fr;
  gap:22px;
  margin-top:36px;
}
@media (max-width:900px){.cat-grid{grid-template-columns:1fr;}}
.cat-card{
  background:var(--white);
  border:1px solid rgba(24,25,25,0.08);
  border-radius:var(--radius-lg);
  padding:32px;
  box-shadow:var(--shadow-card);
  display:flex;flex-direction:column;
}
.cat-card-lg{background:linear-gradient(155deg,var(--blue),var(--blue-deep));border:none;}
.cat-card-lg h3,.cat-card-lg p{color:var(--onDark);}
.cat-card-lg p{color:var(--onDark-blue-tint);}
.cat-icon{color:var(--blue);width:42px;height:42px;margin-bottom:18px;}
.cat-card-lg .cat-icon{color:#fff;}
.cat-icon svg{width:100%;height:100%;}

/* =============== PRODUCTOS =============== */
.prod-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:22px;
  margin-top:36px;
}
.prod-card-featured{grid-column:span 3;display:grid;grid-template-columns:0.9fr 1.1fr;}
@media (max-width:920px){
  .prod-grid{grid-template-columns:repeat(2,1fr);}
  .prod-card-featured{grid-column:span 2;grid-template-columns:1fr;}
}
@media (max-width:620px){
  .prod-grid{grid-template-columns:1fr;}
  .prod-card-featured{grid-column:span 1;}
}
.prod-card{
  background:var(--white);
  border:1px solid rgba(24,25,25,0.08);
  border-radius:var(--radius-md);
  overflow:hidden;
  display:flex;flex-direction:column;
  box-shadow:var(--shadow-card);
}
.prod-media{background:var(--paper);aspect-ratio:1/1;align-self:start;overflow:hidden;}
.prod-media img{width:100%;height:100%;object-fit:contain;padding:14px;}
.prod-body{padding:22px;display:flex;flex-direction:column;flex:1;}
.prod-brand{
  font-size:0.75rem;text-transform:uppercase;letter-spacing:0.06em;
  color:var(--blue);font-weight:700;margin-bottom:6px;
}
.prod-body h3{margin-bottom:12px;}
.prod-specs{margin-bottom:18px;flex:1;}
.prod-specs li{
  font-size:0.9rem;color:var(--ink-soft);padding:6px 0 6px 18px;
  position:relative;border-top:1px solid rgba(24,25,25,0.06);
}
.prod-specs li:first-child{border-top:none;}
.prod-specs li::before{
  content:'';position:absolute;left:0;top:14px;width:6px;height:6px;
  border-radius:50%;background:var(--blue);
}

/* =============== ASESORIA (fotografía real) =============== */
.asesoria-inner{display:grid;grid-template-columns:1.2fr 0.8fr;gap:48px;align-items:center;}
.asesoria-inner > *{min-width:0;}
@media (max-width:860px){.asesoria-inner{grid-template-columns:1fr;}}
.asesoria-list{margin:22px 0 30px;display:flex;flex-direction:column;gap:12px;}
.asesoria-list li{
  color:var(--onDark);font-weight:500;padding-left:26px;position:relative;
}
.asesoria-list li::before{
  content:'';position:absolute;left:0;top:0.4em;width:12px;height:12px;
  border:2px solid var(--blue);border-radius:4px;
}
.asesoria-photo{
  width:100%;height:auto;aspect-ratio:4/5;object-fit:cover;
  border-radius:var(--radius-lg);
}
@media (max-width:860px){.asesoria-photo{aspect-ratio:16/10;}}

/* =============== CONFIANZA =============== */
.trust-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:36px;
}
@media (max-width:760px){.trust-grid{grid-template-columns:repeat(2,1fr);}}
.trust-item{
  display:flex;flex-direction:column;align-items:center;text-align:center;gap:12px;
  padding:26px 16px;background:var(--white);border:1px solid rgba(24,25,25,0.08);border-radius:var(--radius-md);
  box-shadow:var(--shadow-card);
}
.trust-item svg{width:36px;height:36px;color:var(--blue);}
.trust-item span{font-weight:600;font-size:0.92rem;}

/* =============== MARCAS =============== */
.brand-row{
  display:flex;flex-wrap:wrap;gap:14px;margin-top:32px;
}
.brand-chip{
  border:1px solid rgba(24,25,25,0.16);
  border-radius:999px;
  padding:10px 22px;
  font-family:'Space Grotesk',sans-serif;
  font-weight:600;
  font-size:0.95rem;
  color:var(--ink);
}

/* =============== PROCESO =============== */
.steps{
  display:grid;grid-template-columns:1fr auto 1fr auto 1fr;
  align-items:start;gap:8px;margin-top:44px;
}
@media (max-width:760px){
  .steps{grid-template-columns:1fr;}
  .step-line{display:none;}
}
.step{text-align:left;max-width:280px;}
.step h3{color:var(--onDark);}
.step p{color:var(--onDark-muted);}
.step-num{
  display:inline-flex;align-items:center;justify-content:center;
  width:44px;height:44px;border-radius:50%;
  background:#fff;color:var(--blue-deep);font-family:'Space Grotesk',sans-serif;
  font-weight:700;font-size:1.15rem;margin-bottom:16px;
}
.step-line{width:64px;height:2px;background:linear-gradient(90deg,rgba(255,255,255,0.6),transparent);margin-top:22px;align-self:start;}

/* =============== FORMULARIO =============== */
.form-wrap{display:grid;grid-template-columns:0.8fr 1.2fr;gap:48px;align-items:start;}
@media (max-width:860px){.form-wrap{grid-template-columns:1fr;}}
.quote-form{
  display:grid;grid-template-columns:1fr 1fr;gap:18px;
  background:var(--white);padding:32px;border-radius:var(--radius-lg);
  border:1px solid rgba(24,25,25,0.08);
  box-shadow:var(--shadow-card);
}
@media (max-width:560px){.quote-form{grid-template-columns:1fr;}}
.field{display:flex;flex-direction:column;gap:6px;}
.field-full{grid-column:1/-1;}
.field label{font-size:0.85rem;font-weight:600;color:var(--ink);}
.field input,.field select,.field textarea{
  border:1px solid rgba(24,25,25,0.2);
  border-radius:var(--radius-sm);
  padding:11px 14px;
  font-family:inherit;
  font-size:0.95rem;
  background:var(--paper);
  color:var(--ink);
}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:2px solid var(--blue);outline-offset:1px;background:#fff;
}
.field textarea{resize:vertical;}

/* =============== FAQ =============== */
.faq-list{margin-top:32px;max-width:760px;border-top:1px solid rgba(24,25,25,0.1);}
.faq-item{border-bottom:1px solid rgba(24,25,25,0.1);padding:18px 0;}
.faq-item summary{
  cursor:pointer;font-weight:600;font-size:1.02rem;
  list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{
  content:'+';font-size:1.4rem;color:var(--blue);flex-shrink:0;
  transition:transform .2s ease;
}
.faq-item[open] summary::after{transform:rotate(45deg);}
.faq-item p{margin-top:12px;}
.faq-cta{margin-top:36px;display:flex;align-items:center;gap:18px;flex-wrap:wrap;}
.faq-cta p{margin:0;font-weight:600;color:var(--ink);}

/* =============== CTA FINAL =============== */
.final-inner{max-width:680px;padding:0 24px;display:flex;flex-direction:column;align-items:center;margin:0 auto;}
.final-inner h2{max-width:18ch;}
.final-phone{
  display:block;margin-top:20px;color:var(--onDark-muted);
  text-decoration:none;font-family:'Space Grotesk',sans-serif;letter-spacing:0.02em;
}

/* =============== FOOTER =============== */
.site-footer{background:var(--charcoal);color:var(--onDark-muted);padding:60px 0 20px;}
.footer-inner{
  display:grid;grid-template-columns:1.2fr 1fr 1fr 1fr;gap:32px;
}
@media (max-width:820px){.footer-inner{grid-template-columns:1fr 1fr;}}
@media (max-width:520px){.footer-inner{grid-template-columns:1fr;}}
.footer-logo{margin-bottom:14px;}
.footer-col h4{
  color:var(--onDark);font-family:'Space Grotesk',sans-serif;
  font-size:0.95rem;margin-bottom:14px;
}
.footer-col p{font-size:0.86rem;line-height:1.55;margin-bottom:10px;}
.footer-contact a,.footer-col a{color:var(--onDark-muted);text-decoration:none;}
.footer-contact a:hover,.footer-col a:hover{color:var(--onDark-blue-tint);}
.footer-bottom{
  margin-top:44px;padding-top:22px;border-top:1px solid rgba(255,255,255,0.08);
  font-size:0.8rem;
}

/* =============== WHATSAPP FLOTANTE (siempre verde) =============== */
.wa-floating{
  position:fixed;right:20px;bottom:20px;z-index:60;
  background:var(--wa-green);color:#fff;
  width:58px;height:58px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 10px 26px -8px rgba(37,211,102,0.6);
  text-decoration:none;
  transition:width .25s ease, border-radius .25s ease, padding .25s ease;
  overflow:hidden;white-space:nowrap;
}
.wa-floating svg{width:28px;height:28px;fill:#fff;flex-shrink:0;}
.wa-floating-text{
  max-width:0;opacity:0;font-size:0.85rem;font-weight:600;
  transition:max-width .25s ease, opacity .2s ease, margin .25s ease;
}
@media (hover:hover){
  .wa-floating:hover{width:auto;border-radius:999px;padding:0 20px 0 16px;}
  .wa-floating:hover .wa-floating-text{max-width:220px;opacity:1;margin-left:10px;}
}
@media (max-width:640px){
  .wa-floating{bottom:84px;}
}

.mobile-sticky-cta{
  display:none;
  position:fixed;left:0;right:0;bottom:0;z-index:55;
  background:var(--white);
  padding:10px 16px calc(10px + env(safe-area-inset-bottom));
  box-shadow:0 -8px 24px -12px rgba(24,25,25,0.3);
}
@media (max-width:640px){
  .mobile-sticky-cta{display:block;}
}