/* =========================================================
   NIBRE — Fábrica de equipos de calefacción industrial
   Hoja de estilos principal
   ========================================================= */

:root{
  /* Paleta institucional (relevada del sitio original) */
  --naranja:        #E84E1B;
  --naranja-claro:  #FF9424;
  --naranja-suave:  #FC9D39;
  --naranja-oscuro: #C43F14;
  --carbon:         #292929;
  --carbon-2:       #323232;
  --gris-texto:     #5D5C5C;
  --gris-claro:     #F4F2F0;
  --gris-borde:     #E4E1DE;
  --blanco:         #FFFFFF;

  --fuente-titulos: "Barlow Condensed", Arial, sans-serif;
  --fuente-texto:   "Open Sans", Arial, sans-serif;

  --radio: 6px;
  --sombra: 0 10px 30px rgba(41,41,41,.12);
  --transicion: .25s ease;
  --ancho-max: 1200px;
}

/* ---------- Reset básico ---------- */
*, *::before, *::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  font-family:var(--fuente-texto);
  color:var(--gris-texto);
  background:var(--blanco);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
ul{ margin:0; padding:0; list-style:none; }
h1,h2,h3,h4{
  font-family:var(--fuente-titulos);
  color:var(--carbon);
  line-height:1.15;
  margin:0 0 .5em;
  font-weight:700;
  letter-spacing:.3px;
}
h1{ font-size:clamp(2.1rem,5vw,3.4rem); text-transform:uppercase; }
h2{ font-size:clamp(1.7rem,4vw,2.5rem); text-transform:uppercase; }
h3{ font-size:1.3rem; }
p{ margin:0 0 1em; }
button{ font-family:inherit; cursor:pointer; }

.container{
  width:100%;
  max-width:var(--ancho-max);
  margin-inline:auto;
  padding-inline:20px;
}

.skip-link{
  position:absolute; left:-999px; top:0; background:var(--carbon); color:#fff;
  padding:10px 16px; z-index:2000; border-radius:0 0 6px 0;
}
.skip-link:focus{ left:0; }

/* ---------- Botones ---------- */
.btn{
  display:inline-flex; align-items:center; gap:.5em;
  padding:.85em 1.6em;
  border-radius:var(--radio);
  font-weight:700;
  font-family:var(--fuente-texto);
  font-size:.95rem;
  border:2px solid transparent;
  transition:transform var(--transicion), box-shadow var(--transicion), background var(--transicion), color var(--transicion);
  white-space:nowrap;
}
.btn-primary{ background:var(--naranja); color:#fff; }
.btn-primary:hover{ background:var(--naranja-oscuro); transform:translateY(-2px); box-shadow:var(--sombra); }
.btn-outline{ background:transparent; border-color:#fff; color:#fff; }
.btn-outline:hover{ background:#fff; color:var(--carbon); transform:translateY(-2px); }
.btn-dark{ background:var(--carbon); color:#fff; }
.btn-dark:hover{ background:#000; }
.btn-sm{ padding:.6em 1.1em; font-size:.85rem; }
.btn svg{ width:1.1em; height:1.1em; flex:none; }

/* ---------- Barra superior ---------- */
.topbar{
  background:var(--carbon-2);
  color:#cfcfcf;
  font-size:.82rem;
}
.topbar .container{
  display:flex; flex-wrap:wrap; gap:.5em 1.5em;
  align-items:center; justify-content:space-between;
  padding-block:8px;
}
.topbar a{ color:#fff; }
.topbar a:hover{ color:var(--naranja-claro); }
.topbar-info{ display:flex; flex-wrap:wrap; gap:1.2em; }
.topbar-info span{ display:inline-flex; align-items:center; gap:.4em; }
.topbar-social a{ display:inline-flex; padding:.2em; }

/* ---------- Header / nav ---------- */
.site-header{
  background:#fff;
  position:sticky; top:0; z-index:1000;
  box-shadow:0 2px 12px rgba(0,0,0,.06);
}
.header-inner{
  display:flex; align-items:center; justify-content:space-between;
  padding-block:12px;
  gap:20px;
}
.logo img{ height:52px; width:auto; }

.nav-toggle{
  display:none;
  background:none; border:0; padding:8px;
  flex-direction:column; gap:5px;
}
.nav-toggle span{
  width:26px; height:3px; background:var(--carbon); border-radius:2px; transition:var(--transicion);
}

.main-nav ul{ display:flex; align-items:center; gap:6px; }
.main-nav > ul > li{ position:relative; }
.main-nav a{
  display:block;
  padding:12px 14px;
  font-weight:700;
  font-size:.92rem;
  letter-spacing:.4px;
  text-transform:uppercase;
  color:var(--carbon);
  border-bottom:3px solid transparent;
  transition:color var(--transicion), border-color var(--transicion);
}
.main-nav a:hover,
.main-nav a:focus-visible,
.main-nav li.activa > a{
  color:var(--naranja);
  border-color:var(--naranja);
}

.has-submenu > a{ display:flex; align-items:center; gap:.3em; }
.has-submenu > a::after{ content:"▾"; font-size:.7em; }
.submenu{
  position:absolute; top:100%; left:0;
  background:#fff;
  min-width:280px;
  box-shadow:var(--sombra);
  border-radius:0 0 var(--radio) var(--radio);
  border-top:3px solid var(--naranja);
  opacity:0; visibility:hidden; transform:translateY(8px);
  transition:var(--transicion);
  padding:8px 0;
  z-index:50;
}
.has-submenu:hover > .submenu,
.has-submenu:focus-within > .submenu{
  opacity:1; visibility:visible; transform:translateY(0);
}
.submenu a{
  text-transform:none; font-weight:600; font-size:.88rem;
  padding:10px 20px; border-bottom:0; border-left:3px solid transparent;
}
.submenu a:hover{ background:var(--gris-claro); border-left-color:var(--naranja); }

/* ---------- Hero / slider ---------- */
.hero{
  position:relative;
  min-height:78vh;
  display:flex; align-items:center;
  color:#fff;
  overflow:hidden;
  background:var(--carbon);
}
.hero-slides{ position:absolute; inset:0; }
.hero-slide{
  position:absolute; inset:0;
  background-size:cover; background-position:center;
  opacity:0; transition:opacity 1.2s ease;
}
.hero-slide.activo{ opacity:1; }
.hero::after{
  content:""; position:absolute; inset:0;
  background:linear-gradient(100deg, rgba(20,20,20,.86) 0%, rgba(20,20,20,.55) 55%, rgba(232,78,27,.35) 100%);
}
.hero-content{ position:relative; z-index:2; max-width:720px; }
.hero .kicker{
  display:inline-block; background:var(--naranja); color:#fff;
  padding:.4em 1em; border-radius:999px; font-weight:700;
  font-size:.8rem; letter-spacing:1px; text-transform:uppercase; margin-bottom:1em;
}
.hero h1{ color:#fff; }
.hero p.lead{ font-size:1.15rem; color:#eee; max-width:60ch; }
.hero-actions{ display:flex; gap:14px; flex-wrap:wrap; margin-top:1.6em; }
.hero-dots{ position:absolute; z-index:3; bottom:24px; left:50%; transform:translateX(-50%); display:flex; gap:8px; }
.hero-dots button{ width:10px; height:10px; border-radius:50%; border:2px solid #fff; background:transparent; padding:0; }
.hero-dots button.activo{ background:var(--naranja); border-color:var(--naranja); }

.page-hero{
  background:linear-gradient(120deg, var(--carbon) 0%, #1c1c1c 100%);
  color:#fff; padding:70px 0 50px;
  position:relative;
}
.page-hero::before{
  content:""; position:absolute; inset:0 0 auto 0; height:6px; background:linear-gradient(90deg,var(--naranja),var(--naranja-claro));
}
.page-hero h1{ color:#fff; margin-bottom:.3em; }
.breadcrumb{ font-size:.85rem; color:#cfcfcf; }
.breadcrumb a:hover{ color:var(--naranja-claro); }
.page-hero .lead{ color:#d8d8d8; max-width:65ch; }

/* ---------- Secciones genéricas ---------- */
section{ padding:70px 0; }
.section-alt{ background:var(--gris-claro); }
.section-dark{ background:var(--carbon); color:#ddd; }
.section-dark h2{ color:#fff; }
.section-head{ max-width:700px; margin-bottom:2.5em; }
.section-head .eyebrow{
  color:var(--naranja); font-weight:700; text-transform:uppercase;
  letter-spacing:1.5px; font-size:.85rem; display:block; margin-bottom:.6em;
}
.section-head.centrado{ margin-inline:auto; text-align:center; }

/* ---------- Grillas / tarjetas ---------- */
.grid{ display:grid; gap:28px; }
.grid-3{ grid-template-columns:repeat(3,1fr); }
.grid-4{ grid-template-columns:repeat(4,1fr); }
.grid-2{ grid-template-columns:repeat(2,1fr); }

.card{
  background:#fff; border-radius:var(--radio); overflow:hidden;
  box-shadow:0 4px 18px rgba(0,0,0,.07);
  border:1px solid var(--gris-borde);
  display:flex; flex-direction:column;
  transition:transform var(--transicion), box-shadow var(--transicion);
}
.card:hover{ transform:translateY(-6px); box-shadow:var(--sombra); }
.card-img{ aspect-ratio:4/3; overflow:hidden; background:var(--gris-claro); }
.card-img img{ width:100%; height:100%; object-fit:cover; cursor:zoom-in; transition:transform .4s; }
.card:hover .card-img img{ transform:scale(1.06); }
.card-body{ padding:20px; display:flex; flex-direction:column; gap:.6em; flex:1; }
.card-body h3{ margin:0; }
.card-body p{ color:var(--gris-texto); font-size:.95rem; margin:0; flex:1; }
.card-body .btn{ align-self:flex-start; margin-top:.4em; }

/* Sobre nosotros / stats */
.stats{ display:grid; grid-template-columns:repeat(4,1fr); gap:24px; text-align:center; }
.stat strong{ display:block; font-family:var(--fuente-titulos); font-size:2.6rem; color:var(--naranja); line-height:1; }
.stat span{ font-size:.85rem; text-transform:uppercase; letter-spacing:.6px; color:var(--gris-texto); }

.about-grid{ display:grid; grid-template-columns:1.05fr 1fr; gap:50px; align-items:center; }
.about-grid img{ border-radius:var(--radio); box-shadow:var(--sombra); }
.check-list li{ display:flex; gap:.7em; align-items:flex-start; margin-bottom:.7em; }
.check-list li::before{
  content:"✓"; flex:none; width:1.5em; height:1.5em; border-radius:50%;
  background:var(--naranja); color:#fff; font-size:.8rem; font-weight:700;
  display:flex; align-items:center; justify-content:center; margin-top:.15em;
}

/* CTA */
.cta-banda{
  background:linear-gradient(120deg,var(--naranja) 0%,var(--naranja-oscuro) 100%);
  color:#fff; text-align:center; padding:60px 0;
}
.cta-banda h2{ color:#fff; }
.cta-banda p{ color:#fff3ec; max-width:60ch; margin-inline:auto; }
.cta-banda .hero-actions{ justify-content:center; }
.cta-banda .btn-outline{ border-color:#fff; }

/* Clientes */
.clientes-grid{
  display:grid; grid-template-columns:repeat(3,1fr); gap:10px 24px;
}
.clientes-grid li{
  padding:12px 0; border-bottom:1px solid var(--gris-borde);
  font-size:.92rem; color:var(--carbon); font-weight:600;
}
.marquee{ overflow:hidden; position:relative; -webkit-mask-image:linear-gradient(90deg,transparent,#000 6%,#000 94%,transparent); mask-image:linear-gradient(90deg,transparent,#000 6%,#000 94%,transparent); }
.marquee-track{ display:flex; gap:50px; width:max-content; animation:desfile 32s linear infinite; }
.marquee-track span{ font-family:var(--fuente-titulos); font-size:1.3rem; color:var(--carbon); opacity:.55; white-space:nowrap; }
@keyframes desfile{ from{ transform:translateX(0);} to{ transform:translateX(-50%);} }

/* Sistemas de calefacción */
.sistema-detalle{ display:grid; grid-template-columns:1fr 1fr; gap:50px; align-items:center; }
.sistema-detalle img{ border-radius:var(--radio); box-shadow:var(--sombra); }

/* Novedades */
.novedad-destacada{
  display:grid; grid-template-columns:1fr 1fr; gap:40px; align-items:center;
  background:var(--gris-claro); border-radius:var(--radio); padding:36px; margin-bottom:40px;
}
.novedad-destacada img{ border-radius:var(--radio); }
.aviso-tel{
  background:#fff; border:2px dashed var(--naranja); border-radius:var(--radio);
  padding:24px; text-align:center; font-family:var(--fuente-titulos); font-size:1.3rem; color:var(--carbon);
}
.aviso-tel a{ color:var(--naranja); }

/* Producto detalle */
.producto-hero{ display:grid; grid-template-columns:.9fr 1.1fr; gap:50px; align-items:start; }
.producto-hero .card-img{ border-radius:var(--radio); box-shadow:var(--sombra); }
.producto-cuerpo{ white-space:pre-line; }
.producto-cuerpo p{ margin-bottom:1em; }
.ficha-lateral{
  background:var(--gris-claro); border-radius:var(--radio); padding:26px; margin-top:24px;
}
.ficha-lateral h4{ margin-bottom:.6em; }
.related{ margin-top:20px; }

/* Formulario de contacto */
.contacto-grid{ display:grid; grid-template-columns:1fr 1.1fr; gap:50px; align-items:start; }
.info-contacto li{ display:flex; gap:.8em; margin-bottom:1.1em; align-items:flex-start; }
.info-contacto svg{ flex:none; width:22px; height:22px; color:var(--naranja); margin-top:.15em; }
.info-contacto a:hover{ color:var(--naranja); }

form.form-contacto{ background:var(--gris-claro); padding:30px; border-radius:var(--radio); }
.campo{ margin-bottom:18px; }
.campo label{ display:block; font-weight:700; font-size:.85rem; margin-bottom:.4em; color:var(--carbon); }
.campo input, .campo textarea{
  width:100%; padding:.8em 1em; border:1px solid var(--gris-borde); border-radius:var(--radio);
  font-family:inherit; font-size:.95rem; background:#fff; color:var(--carbon);
}
.campo input:focus, .campo textarea:focus{ outline:2px solid var(--naranja); outline-offset:1px; }
.form-nota{ font-size:.8rem; color:var(--gris-texto); margin-top:.6em; }
.mapa{ border:0; width:100%; height:320px; border-radius:var(--radio); margin-top:30px; }

/* ---------- Footer ---------- */
.site-footer{ background:var(--carbon-2); color:#c9c9c9; padding-top:60px; }
.footer-grid{ display:grid; grid-template-columns:1.3fr 1fr 1fr 1.1fr; gap:40px; padding-bottom:40px; }
.footer-grid h4{ color:#fff; font-size:1rem; text-transform:uppercase; letter-spacing:.5px; margin-bottom:1em; }
.footer-grid p{ font-size:.9rem; color:#b6b6b6; }
.footer-logo img{ height:44px; margin-bottom:1em; filter:brightness(0) invert(1); }
.footer-links li{ margin-bottom:.6em; font-size:.9rem; }
.footer-links a:hover{ color:var(--naranja-claro); }
.footer-social{ display:flex; gap:10px; margin-top:1em; }
.footer-social a{
  width:38px; height:38px; border-radius:50%; background:#3d3d3d;
  display:flex; align-items:center; justify-content:center; transition:var(--transicion);
}
.footer-social a:hover{ background:var(--naranja); }
.footer-bottom{
  border-top:1px solid #3d3d3d; padding:18px 0; font-size:.8rem;
  display:flex; flex-wrap:wrap; gap:10px; justify-content:space-between; color:#9a9a9a;
}
.footer-bottom a:hover{ color:var(--naranja-claro); }

/* ---------- Botón flotante de WhatsApp ---------- */
.whatsapp-flotante{
  position:fixed; right:20px; bottom:20px; z-index:1500;
  width:60px; height:60px; border-radius:50%;
  background:#25D366; display:flex; align-items:center; justify-content:center;
  box-shadow:0 6px 20px rgba(0,0,0,.3);
  animation:pulso 2.4s infinite;
}
.whatsapp-flotante svg{ width:32px; height:32px; fill:#fff; }
@keyframes pulso{
  0%{ box-shadow:0 0 0 0 rgba(37,211,102,.55); }
  70%{ box-shadow:0 0 0 16px rgba(37,211,102,0); }
  100%{ box-shadow:0 0 0 0 rgba(37,211,102,0); }
}

/* ---------- Lightbox ---------- */
.lightbox{
  position:fixed; inset:0; background:rgba(15,15,15,.92);
  display:none; align-items:center; justify-content:center; z-index:3000;
  padding:40px 20px;
}
.lightbox.abierto{ display:flex; }
.lightbox img{ max-width:min(90vw,1000px); max-height:85vh; border-radius:4px; box-shadow:0 10px 40px rgba(0,0,0,.5); }
.lightbox-cerrar{
  position:absolute; top:18px; right:22px; background:none; border:0; color:#fff;
  font-size:2.2rem; line-height:1; padding:6px 12px; cursor:pointer;
}
.lightbox-cerrar:hover{ color:var(--naranja-claro); }

/* ---------- Utilidades ---------- */
.text-center{ text-align:center; }
.mt-0{ margin-top:0; }
.badge{
  display:inline-block; background:var(--naranja); color:#fff; font-size:.75rem;
  font-weight:700; text-transform:uppercase; letter-spacing:.5px; padding:.3em .8em; border-radius:999px;
  margin-bottom:.8em;
}

/* ---------- Responsive ---------- */
@media (max-width:1024px){
  .grid-4{ grid-template-columns:repeat(2,1fr); }
  .grid-3{ grid-template-columns:repeat(2,1fr); }
  .about-grid, .sistema-detalle, .producto-hero, .contacto-grid, .novedad-destacada{
    grid-template-columns:1fr;
  }
  .stats{ grid-template-columns:repeat(2,1fr); gap:32px; }
  .footer-grid{ grid-template-columns:1fr 1fr; }
}

@media (max-width:860px){
  .nav-toggle{ display:flex; }
  .main-nav{
    position:fixed; inset:0 0 0 auto; width:min(320px,86vw); height:100vh;
    background:#fff; padding:90px 24px 40px; box-shadow:-8px 0 30px rgba(0,0,0,.2);
    transform:translateX(100%); transition:transform var(--transicion);
    overflow-y:auto;
  }
  .main-nav.abierto{ transform:translateX(0); }
  .main-nav ul{ flex-direction:column; align-items:stretch; gap:0; }
  .main-nav a{ padding:14px 4px; border-bottom:1px solid var(--gris-borde); }
  .has-submenu > a::after{ margin-left:auto; }
  .main-nav .submenu{
    position:static; box-shadow:none; border:0; opacity:1; visibility:visible;
    transform:none; display:none; padding-left:12px; min-width:0;
  }
  .main-nav .has-submenu.abierto .submenu{ display:flex; }
  .nav-overlay{
    position:fixed; inset:0; background:rgba(0,0,0,.5); z-index:900;
    opacity:0; visibility:hidden; transition:var(--transicion);
  }
  .nav-overlay.activo{ opacity:1; visibility:visible; }
  .topbar-info span:nth-child(3){ display:none; }
}

@media (max-width:640px){
  section{ padding:50px 0; }
  .grid-4, .grid-3, .grid-2{ grid-template-columns:1fr; }
  .stats{ grid-template-columns:1fr 1fr; }
  .clientes-grid{ grid-template-columns:1fr; }
  .hero{ min-height:88vh; text-align:left; }
  .footer-grid{ grid-template-columns:1fr; }
  .whatsapp-flotante{ width:54px; height:54px; right:14px; bottom:14px; }
}

@media (prefers-reduced-motion: reduce){
  *{ animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:.001ms !important; }
  html{ scroll-behavior:auto; }
}