/* ============================================================
   RADON INDUSTRIAL — radonindustrial.com
   Hoja de estilos principal · Estética industrial
   ============================================================ */

:root {
  --antracita: #161b21;
  --antracita-2: #1f262e;
  --gris: #2b333d;
  --gris-claro: #8a949e;
  --linea: #39424d;
  --acento: #f07818;
  --acento-osc: #c95f0a;
  --claro: #f4f5f6;
  --blanco: #ffffff;
  --fuente-titulos: "Barlow Condensed", "Arial Narrow", sans-serif;
  --fuente-texto: "Barlow", "Segoe UI", Arial, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--fuente-texto);
  color: var(--antracita);
  background: var(--claro);
  line-height: 1.65;
  font-size: 17px;
}

img { max-width: 100%; display: block; }

a { color: var(--acento-osc); text-decoration: none; }
a:hover { text-decoration: underline; }

.contenedor {
  width: min(1180px, 92%);
  margin: 0 auto;
}

/* ---------- Cabecera ---------- */
.cabecera {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background: rgba(22, 27, 33, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--linea);
}

.cabecera .contenedor {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  font-family: var(--fuente-titulos);
  font-weight: 700;
  font-size: 1.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--blanco);
  display: flex;
  align-items: center;
  gap: 0.55rem;
}
.logo:hover { text-decoration: none; }

.logo .icono-rn {
  width: 36px; height: 36px;
  background: var(--acento);
  color: var(--antracita);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.05rem;
  font-weight: 800;
  clip-path: polygon(0 0, 100% 0, 100% 75%, 75% 100%, 0 100%);
}

.logo span.industrial { color: var(--acento); }

.nav-principal { display: flex; gap: 1.6rem; align-items: center; }

.nav-principal a {
  color: #cdd4da;
  font-size: 0.98rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  padding: 0.4rem 0;
  border-bottom: 2px solid transparent;
}
.nav-principal a:hover,
.nav-principal a.activo {
  color: var(--blanco);
  border-bottom-color: var(--acento);
  text-decoration: none;
}

.nav-principal .btn-contacto {
  background: var(--acento);
  color: var(--antracita);
  font-weight: 700;
  padding: 0.55rem 1.2rem;
  border-bottom: none;
}
.nav-principal .btn-contacto:hover { background: var(--blanco); }

.menu-toggle { display: none; background: none; border: none; cursor: pointer; }
.menu-toggle span {
  display: block; width: 26px; height: 3px;
  background: var(--blanco); margin: 5px 0;
}

/* ---------- Hero ---------- */
.hero {
  min-height: 92vh;
  display: flex;
  align-items: center;
  position: relative;
  color: var(--blanco);
  background-size: cover;
  background-position: center;
  padding: 140px 0 90px;
}

.hero::before {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(100deg,
    rgba(15, 19, 24, 0.93) 0%,
    rgba(15, 19, 24, 0.75) 45%,
    rgba(15, 19, 24, 0.35) 100%);
}

.hero .contenedor { position: relative; z-index: 1; }

.hero-interior { min-height: 62vh; padding: 150px 0 70px; }

.eyebrow {
  display: inline-block;
  font-family: var(--fuente-titulos);
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-size: 0.95rem;
  color: var(--acento);
  border-left: 4px solid var(--acento);
  padding-left: 0.8rem;
  margin-bottom: 1.1rem;
}

.hero h1 {
  font-family: var(--fuente-titulos);
  font-size: clamp(2.6rem, 6vw, 4.6rem);
  line-height: 1.04;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.015em;
  max-width: 16ch;
}

.hero h1 em { font-style: normal; color: var(--acento); }

.hero p.sub {
  margin-top: 1.4rem;
  max-width: 56ch;
  font-size: 1.16rem;
  color: #dde2e7;
}

.hero-acciones { margin-top: 2.2rem; display: flex; gap: 1rem; flex-wrap: wrap; }

.btn {
  display: inline-block;
  font-family: var(--fuente-titulos);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  font-size: 1.05rem;
  padding: 0.85rem 1.9rem;
  border: 2px solid var(--acento);
  transition: all 0.18s ease;
}
.btn:hover { text-decoration: none; }

.btn-primario { background: var(--acento); color: var(--antracita); }
.btn-primario:hover { background: var(--blanco); border-color: var(--blanco); }

.btn-secundario { background: transparent; color: var(--blanco); }
.btn-secundario:hover { background: var(--acento); color: var(--antracita); }

/* Franja tipo señalización industrial */
.franja-industrial {
  height: 10px;
  background: repeating-linear-gradient(
    -45deg,
    var(--acento) 0 18px,
    var(--antracita) 18px 36px
  );
}

/* ---------- Bloques generales ---------- */
.seccion { padding: 5.2rem 0; }
.seccion-oscura { background: var(--antracita); color: var(--claro); }
.seccion-gris { background: #e8eaec; }

.titulo-seccion {
  font-family: var(--fuente-titulos);
  font-size: clamp(2rem, 4vw, 3rem);
  text-transform: uppercase;
  line-height: 1.08;
  margin-bottom: 0.6rem;
}
.titulo-seccion em { font-style: normal; color: var(--acento); }

.intro-seccion { max-width: 70ch; color: #4c565f; margin-bottom: 2.8rem; font-size: 1.08rem; }
.seccion-oscura .intro-seccion { color: #b9c2ca; }

/* ---------- Tarjetas de servicios ---------- */
.rejilla-servicios {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.8rem;
}

.tarjeta-servicio {
  background: var(--blanco);
  border-top: 4px solid var(--acento);
  box-shadow: 0 10px 28px rgba(15, 19, 24, 0.10);
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.tarjeta-servicio:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 38px rgba(15, 19, 24, 0.18);
}

.tarjeta-servicio .foto {
  height: 215px;
  background-size: cover;
  background-position: center;
  position: relative;
}
.tarjeta-servicio .foto::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(15,19,24,0) 55%, rgba(15,19,24,0.55) 100%);
}

.tarjeta-servicio .cuerpo { padding: 1.6rem 1.7rem 1.9rem; flex: 1; display: flex; flex-direction: column; }

.tarjeta-servicio h3 {
  font-family: var(--fuente-titulos);
  font-size: 1.55rem;
  text-transform: uppercase;
  line-height: 1.1;
  margin-bottom: 0.7rem;
}

.tarjeta-servicio p { color: #4c565f; font-size: 0.99rem; flex: 1; }

.tarjeta-servicio .enlace {
  margin-top: 1.3rem;
  font-family: var(--fuente-titulos);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  color: var(--acento-osc);
}
.tarjeta-servicio .enlace::after { content: " →"; }

/* ---------- Cifras / experiencia ---------- */
.rejilla-cifras {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  text-align: center;
}

.cifra {
  border: 1px solid var(--linea);
  padding: 2rem 1rem 1.7rem;
  background: var(--antracita-2);
}

.cifra .numero {
  font-family: var(--fuente-titulos);
  font-size: 3.2rem;
  font-weight: 700;
  color: var(--acento);
  line-height: 1;
}

.cifra .etiqueta {
  margin-top: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.88rem;
  color: #b9c2ca;
}

/* ---------- Proceso ---------- */
.rejilla-proceso {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.6rem;
  counter-reset: paso;
}

.paso {
  background: var(--blanco);
  padding: 1.8rem 1.6rem;
  border-left: 4px solid var(--acento);
  box-shadow: 0 6px 18px rgba(15, 19, 24, 0.08);
  counter-increment: paso;
}

.paso::before {
  content: "0" counter(paso);
  font-family: var(--fuente-titulos);
  font-size: 2.4rem;
  font-weight: 700;
  color: #d4d9dd;
  display: block;
  line-height: 1;
  margin-bottom: 0.6rem;
}

.paso h3 {
  font-family: var(--fuente-titulos);
  text-transform: uppercase;
  font-size: 1.3rem;
  margin-bottom: 0.45rem;
}

.paso p { font-size: 0.96rem; color: #4c565f; }

/* ---------- Listas técnicas ---------- */
.lista-tecnica { list-style: none; margin: 1.2rem 0 0; }
.lista-tecnica li {
  padding: 0.65rem 0 0.65rem 2rem;
  position: relative;
  border-bottom: 1px dashed #cfd4d9;
}
.seccion-oscura .lista-tecnica li { border-bottom-color: var(--linea); }
.lista-tecnica li::before {
  content: "▸";
  position: absolute; left: 0.4rem;
  color: var(--acento);
  font-weight: 700;
}

/* ---------- Columnas con imagen ---------- */
.dos-columnas {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 3rem;
  align-items: center;
}

.dos-columnas .imagen {
  min-height: 420px;
  background-size: cover;
  background-position: center;
  box-shadow: 14px 14px 0 var(--acento);
}

.dos-columnas.invertida .imagen { box-shadow: -14px 14px 0 var(--acento); order: 2; }

/* ---------- Banda CTA con imagen fija ---------- */
.banda-cta {
  position: relative;
  padding: 5.5rem 0;
  color: var(--blanco);
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  text-align: center;
}
.banda-cta::before {
  content: "";
  position: absolute; inset: 0;
  background: rgba(15, 19, 24, 0.82);
}
.banda-cta .contenedor { position: relative; z-index: 1; }
.banda-cta h2 {
  font-family: var(--fuente-titulos);
  font-size: clamp(1.9rem, 4vw, 2.9rem);
  text-transform: uppercase;
  margin-bottom: 1.6rem;
}

/* ---------- Aviso normativo ---------- */
.caja-normativa {
  background: var(--antracita-2);
  border: 1px solid var(--linea);
  border-left: 5px solid var(--acento);
  padding: 1.6rem 1.8rem;
  margin-top: 2rem;
}
.caja-normativa strong { color: var(--acento); }

/* ---------- Contacto ---------- */
.rejilla-contacto {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.6rem;
  margin-top: 2.4rem;
}

.dato-contacto {
  border: 1px solid var(--linea);
  background: var(--antracita-2);
  padding: 1.8rem 1.6rem;
}

.dato-contacto h3 {
  font-family: var(--fuente-titulos);
  text-transform: uppercase;
  font-size: 1.2rem;
  color: var(--acento);
  margin-bottom: 0.4rem;
}

.dato-contacto a { color: var(--blanco); font-size: 1.1rem; }

/* ---------- Formulario de contacto ---------- */
.formulario-contacto {
  margin-top: 2.4rem;
  border: 1px solid var(--linea);
  background: var(--antracita-2);
  padding: 2rem 1.8rem;
}

.formulario-contacto .campo-doble {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.2rem;
}

.formulario-contacto .campo { margin-bottom: 1.2rem; }

.formulario-contacto label {
  display: block;
  font-family: var(--fuente-titulos);
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  color: var(--acento);
  margin-bottom: 0.4rem;
}

.formulario-contacto input,
.formulario-contacto select,
.formulario-contacto textarea {
  width: 100%;
  padding: 0.7rem 0.9rem;
  background: var(--antracita, #161b22);
  border: 1px solid var(--linea);
  color: var(--blanco);
  font: inherit;
  font-size: 1rem;
}

.formulario-contacto input:focus,
.formulario-contacto select:focus,
.formulario-contacto textarea:focus {
  outline: 2px solid var(--acento);
  outline-offset: -1px;
}

.formulario-contacto button { margin-top: 0.4rem; cursor: pointer; }

/* ---------- Pie ---------- */
.pie {
  background: #10141a;
  color: #97a1ab;
  padding: 2.6rem 0;
  font-size: 0.92rem;
}
.pie .contenedor {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}
.pie a { color: #cdd4da; }
.pie nav { display: flex; gap: 1.4rem; flex-wrap: wrap; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .dos-columnas,
  .dos-columnas.invertida { grid-template-columns: 1fr; }
  .dos-columnas .imagen,
  .dos-columnas.invertida .imagen { min-height: 280px; order: 0; box-shadow: 0 10px 0 var(--acento); }
  .banda-cta { background-attachment: scroll; }

  .menu-toggle { display: block; }
  .nav-principal {
    display: none;
    position: absolute;
    top: 72px; left: 0; right: 0;
    background: var(--antracita);
    flex-direction: column;
    padding: 1.4rem 0 1.8rem;
    border-bottom: 2px solid var(--acento);
  }
  .nav-principal.abierto { display: flex; }
}