:root {
  --azul-marino: #1e293b;
  --azul-claro: #f1f5f9;
  --naranja-ferretero: #f97316;
  --texto-oscuro: #0f172a;
  --blanco: #ffffff;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background-color: #f8fafc;
  color: var(--texto-oscuro);
  line-height: 1.6;
}

/* ENCABEZADO */
header {
  background-color: var(--azul-marino);
  color: var(--blanco);
  padding: 1rem 2rem;
  border-bottom: 3px solid var(--naranja-ferretero);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.brand-box {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo-img {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  object-fit: cover;
  background-color: white;
  border: 2px solid var(--naranja-ferretero);
}

.brand-text h1 {
  font-size: 1.5rem;
  font-weight: 700;
}

.brand-text h1 span {
  color: var(--naranja-ferretero);
}

.brand-text p {
  font-size: 0.8rem;
  color: #94a3b8;
}

nav {
  display: flex;
  gap: 1.5rem;
}

nav a {
  color: var(--blanco);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.3s;
}

nav a:hover {
  color: var(--naranja-ferretero);
}

nav a.active {
  color: var(--naranja-ferretero);
  border-bottom: 2px solid var(--naranja-ferretero);
  padding-bottom: 2px;
}

/* BANNER CON VIDEO IFRAME TOTALMENTE CENTRADO Y SIN BORDES */
.hero-video-wrapper {
  position: relative;
  width: 100%;
  height: 280px;
  overflow: hidden;
  background-color: #0f172a;
  border-bottom: 3px solid var(--naranja-ferretero);
}

.hero-video-wrapper iframe {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 130vw;
  height: 73.125vw; /* Mantiene proporción 16:9 en relación al ancho de pantalla */
  min-width: 100%;
  min-height: 100%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  opacity: 0.35;
}

.hero-overlay-content {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 0 1.5rem;
  color: var(--blanco);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.8);
}

.hero-overlay-content h2 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.hero-overlay-content p {
  font-size: 1rem;
  max-width: 800px;
}

/* CONTENEDOR Y TARJETAS */
.container {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.card {
  background-color: var(--blanco);
  padding: 1.8rem;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
  margin-bottom: 2rem;
}

.card h2 {
  color: var(--azul-marino);
  font-size: 1.4rem;
  margin-bottom: 1rem;
  border-bottom: 2px solid var(--azul-claro);
  padding-bottom: 0.5rem;
}

/* GRIDS */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.calc-card {
  background-color: var(--azul-claro);
  padding: 1.5rem;
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-left: 4px solid var(--naranja-ferretero);
}

.calc-card h3 {
  color: var(--azul-marino);
  margin-bottom: 0.5rem;
}

.calc-card p {
  font-size: 0.9rem;
  color: #475569;
}

.info-box {
  background-color: var(--azul-claro);
  padding: 1.2rem;
  border-radius: 8px;
}

.info-box h3 {
  color: var(--azul-marino);
  margin-bottom: 0.5rem;
}

.info-box p {
  font-size: 0.92rem;
}

/* BOTONES NARANJA */
.btn-primary {
  display: inline-block;
  background-color: var(--naranja-ferretero);
  color: var(--blanco);
  padding: 0.6rem 1.2rem;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 600;
  text-align: center;
  margin-top: 1rem;
  transition: background-color 0.3s;
}

.btn-primary:hover {
  background-color: #ea580c;
}

/* GALERÍA DE PRODUCTOS CON CARRUSEL */
.product-card-gallery {
  background: var(--blanco);
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  display: flex;
  flex-direction: column;
}

.carousel-container {
  position: relative;
  width: 100%;
  height: 180px;
  overflow: hidden;
  background-color: #000;
}

.carousel-slide {
  display: flex;
  width: 100%;
  height: 100%;
  transition: transform 0.4s ease-in-out;
}

.carousel-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  flex-shrink: 0;
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background-color: rgba(0, 0, 0, 0.5);
  color: white;
  border: none;
  padding: 8px 12px;
  cursor: pointer;
  border-radius: 4px;
  font-size: 14px;
  z-index: 2;
  transition: background-color 0.2s;
}

.carousel-btn:hover {
  background-color: rgba(249, 115, 22, 0.9);
}

.carousel-btn.prev {
  left: 5px;
}
.carousel-btn.next {
  right: 5px;
}

.product-info-box {
  padding: 1rem;
}

.product-info-box h4 {
  color: var(--azul-marino);
  font-size: 1.05rem;
  margin-bottom: 0.4rem;
}

.product-info-box p {
  font-size: 0.85rem;
  color: #64748b;
}

/* PIE DE PÁGINA */
footer {
  text-align: center;
  padding: 1.5rem;
  background-color: var(--azul-marino);
  color: var(--blanco);
  font-size: 0.9rem;
  margin-top: 2rem;
}

/* ESTILOS PARA FORMULARIOS Y CALCULADORAS */
.form-group {
  margin-bottom: 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--azul-marino);
}

.form-group input,
.form-group select {
  padding: 0.75rem;
  border: 1px solid #cbd5e1;
  border-radius: 6px;
  font-size: 1rem;
  background-color: #fff;
  transition:
    border-color 0.2s,
    box-shadow 0.2s;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--naranja-ferretero);
  box-shadow: 0 0 0 3px rgba(249, 115, 22, 0.2);
}

/* =======================================================
   RESPONSIVE / MÓVIL - aplica a TODAS las páginas por igual
   ======================================================= */

/* Tablet y móvil grande */
@media (max-width: 768px) {
  .header-container {
    flex-direction: column;
    text-align: center;
    gap: 0.75rem;
  }

  .brand-box {
    flex-direction: column;
    text-align: center;
    gap: 0.5rem;
  }

  nav {
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.6rem 1rem;
    font-size: 0.85rem;
  }

  .hero-video-wrapper {
    height: 180px;
  }

  .hero-overlay-content h2 {
    font-size: 1.35rem;
  }

  .hero-overlay-content p {
    font-size: 0.85rem;
  }

  .container {
    padding: 0 0.85rem;
  }

  .card {
    padding: 1.2rem;
  }

  .grid-2,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  /* Tablas de dosificación con scroll horizontal en vez de desbordar */
  table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
  }
}

/* Móvil pequeño */
@media (max-width: 480px) {
  .brand-text h1 {
    font-size: 1.15rem;
  }

  .brand-text p {
    font-size: 0.72rem;
  }

  .logo-img {
    width: 42px;
    height: 42px;
  }

  nav {
    font-size: 0.78rem;
    gap: 0.5rem 0.8rem;
  }

  .hero-video-wrapper {
    height: 150px;
  }

  .hero-overlay-content h2 {
    font-size: 1.1rem;
  }

  .card h2 {
    font-size: 1.15rem;
  }

  .btn-primary {
    width: 100%;
  }
}

/* Evita que tablas u otro contenido ensanchen la página en móvil */
.grid-2 > * {
  min-width: 0;
}
.card {
  min-width: 0;
}
.card table {
  display: block;
  max-width: 100%;
  overflow-x: auto;
}