/* ============================================================
   SAB GeoConsulting – style.css
   Colors: Orange #E87722 | Blue #1A3A6B | Light Blue #2E6DB4
   ============================================================ */

/* ---- RESET & BASE ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: 'Open Sans', sans-serif;
  color: #2d2d2d;
  background: #fff;
  line-height: 1.7;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* ---- CSS VARIABLES ---- */
:root {
  --orange: #E87722;
  --orange-dark: #c9611a;
  --blue: #1A3A6B;
  --blue-mid: #2E6DB4;
  --blue-light: #e8f0fa;
  --gray-light: #f5f6f8;
  --gray: #6b7280;
  --white: #ffffff;
  --shadow: 0 4px 20px rgba(0,0,0,0.10);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.15);
  --radius: 12px;
  --transition: 0.3s ease;
}

/* ---- CONTAINER ---- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }

/* ---- BUTTONS ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: 50px;
  font-family: 'Montserrat', sans-serif;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
}
.btn-primary {
  background: var(--orange);
  color: var(--white);
  border-color: var(--orange);
}
.btn-primary:hover {
  background: var(--orange-dark);
  border-color: var(--orange-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(232,119,34,0.4);
}
.btn-outline {
  background: transparent;
  color: var(--white);
  border-color: var(--white);
}
.btn-outline:hover {
  background: var(--white);
  color: var(--blue);
  transform: translateY(-2px);
}
.btn-outline-dark {
  background: transparent;
  color: var(--blue);
  border-color: var(--blue);
  border-radius: 50px;
  padding: 0.65rem 1.5rem;
  font-family: 'Montserrat', sans-serif;
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all var(--transition);
}
.btn-outline-dark:hover {
  background: var(--blue);
  color: var(--white);
  transform: translateY(-2px);
}
.btn-large { padding: 1rem 2.5rem; font-size: 1.05rem; }
.btn-full { width: 100%; justify-content: center; }

/* ---- SECTION COMMON ---- */
.section { padding: 5rem 0; }
.section-header { text-align: center; margin-bottom: 3.5rem; }
.section-header.light h2,
.section-header.light .section-tag { color: var(--white); }
.section-header.light .divider { background: var(--orange); }
.section-tag {
  display: inline-block;
  background: var(--blue-light);
  color: var(--blue-mid);
  font-family: 'Montserrat', sans-serif;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 0.3rem 1rem;
  border-radius: 50px;
  margin-bottom: 0.75rem;
}
.section-header.light .section-tag {
  background: rgba(255,255,255,0.15);
  color: var(--white);
}
.section-header h2 {
  font-family: 'Montserrat', sans-serif;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  color: var(--blue);
  margin-bottom: 1rem;
}
.divider {
  width: 60px;
  height: 4px;
  background: var(--orange);
  border-radius: 2px;
  margin: 0 auto 1.25rem;
}
.section-subtitle {
  max-width: 680px;
  margin: 0 auto;
  color: var(--gray);
  font-size: 1.05rem;
}

/* ============================================================
   NAVBAR
   ============================================================ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(26,58,107,0.97);
  backdrop-filter: blur(10px);
  transition: box-shadow var(--transition);
}
.navbar.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,0.25); }
.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}
.nav-logo img { height: 62px; width: auto; filter: drop-shadow(0 2px 8px rgba(0,0,0,0.45)); }
.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.nav-link {
  font-family: 'Montserrat', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  color: rgba(255,255,255,0.85);
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  transition: all var(--transition);
  letter-spacing: 0.3px;
}
.nav-link:hover, .nav-link.active {
  color: var(--white);
  background: rgba(255,255,255,0.1);
}
.btn-brochure {
  background: var(--orange) !important;
  color: var(--white) !important;
  border-radius: 50px !important;
  padding: 0.45rem 1.1rem !important;
  margin-left: 0.5rem;
}
.btn-brochure:hover {
  background: var(--orange-dark) !important;
  transform: translateY(-1px);
}
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.25rem;
}
.nav-toggle span {
  display: block;
  width: 25px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  background: url('hero_mining_new.jpg') center center / cover no-repeat;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(26,58,107,0.82) 0%,
    rgba(26,58,107,0.60) 50%,
    rgba(232,119,34,0.38) 100%
  );
}
.hero-content {
  position: relative;
  z-index: 2;
  padding: 2rem 1.5rem;
  max-width: 1000px;
}
.hero-logo {
  height: 280px;
  width: auto;
  margin: 0 auto -0.5rem;
  filter: drop-shadow(0 6px 28px rgba(0,0,0,0.7));
}
.hero-content h1 {
  font-family: 'Montserrat', sans-serif;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  color: var(--white);
  line-height: 1.2;
  margin-bottom: 1rem;
  text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}
.hero-content p {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: rgba(255,255,255,0.9);
  margin-bottom: 2rem;
  font-weight: 300;
  letter-spacing: 0.5px;
  line-height: 2;
}
.hero-content p.hero-subtitle {
  font-family: 'Montserrat', sans-serif;
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
  color: rgba(255,255,255,0.95);
  margin-bottom: 0.4rem;
  font-weight: 700;
  letter-spacing: 1px;
  line-height: 1.8;
}
p.hero-tagline {
  font-family: 'Montserrat', sans-serif;
  font-size: clamp(1.2rem, 2.8vw, 1.6rem);
  color: var(--orange) !important;
  font-weight: 700;
  font-style: italic;
  letter-spacing: 0.5px;
  margin-bottom: 2rem;
  text-shadow: 0 2px 10px rgba(0,0,0,0.4);
}
.hero-buttons { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.hero-scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
}
.hero-scroll a {
  color: rgba(255,255,255,0.7);
  font-size: 1.5rem;
  animation: bounce 2s infinite;
  display: block;
}
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(8px); }
}

/* ============================================================
   NOSOTROS
   ============================================================ */
.nosotros { background: var(--white); }
.nosotros-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}
.nosotros-text p {
  color: #444;
  margin-bottom: 1.25rem;
  font-size: 1.02rem;
}
.nosotros-stats {
  display: flex;
  gap: 2rem;
  margin-top: 2.5rem;
  flex-wrap: wrap;
}
.stat {
  text-align: center;
  flex: 1;
  min-width: 100px;
}
.stat-number {
  display: block;
  font-family: 'Montserrat', sans-serif;
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--orange);
  line-height: 1;
  margin-bottom: 0.4rem;
}
.stat-label {
  font-size: 0.8rem;
  color: var(--gray);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.nosotros-image {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  position: relative;
}
.nosotros-image::before {
  content: '';
  position: absolute;
  inset: -8px;
  border: 3px solid var(--orange);
  border-radius: calc(var(--radius) + 8px);
  z-index: -1;
}
.nosotros-image img {
  width: 100%;
  height: 420px;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.nosotros-image:hover img { transform: scale(1.03); }

/* ============================================================
   MISIÓN & VISIÓN
   ============================================================ */
.mision-vision {
  position: relative;
  background: var(--blue);
  overflow: hidden;
}
.mv-bg {
  position: absolute;
  inset: 0;
  background: url('hero_mining_new.jpg') center / cover no-repeat;
  opacity: 0.08;
}
.mv-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  position: relative;
  z-index: 1;
}
.mv-card {
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius);
  padding: 2.5rem 2rem;
  transition: all var(--transition);
}
.mv-card:hover {
  background: rgba(255,255,255,0.12);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.2);
}
.mv-icon {
  width: 60px;
  height: 60px;
  background: var(--orange);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--white);
  margin-bottom: 1.5rem;
}
.mv-card h3 {
  font-family: 'Montserrat', sans-serif;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 1rem;
}
.mv-card p {
  color: rgba(255,255,255,0.82);
  font-size: 0.97rem;
  line-height: 1.75;
}
.valores-list { padding: 0; }
.valores-list li {
  color: rgba(255,255,255,0.82);
  font-size: 0.95rem;
  padding: 0.4rem 0;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.valores-list li:last-child { border-bottom: none; }
.valores-list .fa-check { color: var(--orange); font-size: 0.8rem; }

/* ============================================================
   SERVICIOS
   ============================================================ */
.servicios { background: var(--gray-light); }
.servicios-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}
.servicio-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow);
  transition: all var(--transition);
  border-top: 4px solid transparent;
  position: relative;
  overflow: hidden;
}
.servicio-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--orange), var(--blue-mid));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}
.servicio-card:hover::before { transform: scaleX(1); }
.servicio-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.servicio-icon-wrap {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--orange), var(--orange-dark));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: var(--white);
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 15px rgba(232,119,34,0.3);
}
.servicio-card h3 {
  font-family: 'Montserrat', sans-serif;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--blue);
  margin-bottom: 0.85rem;
}
.servicio-card p {
  color: #555;
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
  line-height: 1.7;
}
.servicio-list { padding-left: 0; }
.servicio-list li {
  font-size: 0.88rem;
  color: var(--gray);
  padding: 0.3rem 0 0.3rem 1.2rem;
  position: relative;
  border-bottom: 1px dashed #e5e7eb;
}
.servicio-list li:last-child { border-bottom: none; }
.servicio-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--orange);
  font-size: 0.75rem;
}

/* ============================================================
   GALERÍA
   ============================================================ */
.galeria { overflow: hidden; }
.galeria-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  height: 320px;
}
.galeria-item {
  position: relative;
  overflow: hidden;
  cursor: pointer;
}
.galeria-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.galeria-item:hover img { transform: scale(1.08); }
.galeria-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(26,58,107,0.85) 0%, transparent 60%);
  display: flex;
  align-items: flex-end;
  padding: 1.25rem;
  opacity: 0;
  transition: opacity var(--transition);
}
.galeria-item:hover .galeria-overlay { opacity: 1; }
.galeria-overlay span {
  font-family: 'Montserrat', sans-serif;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.5px;
}

/* ============================================================
   EQUIPO
   ============================================================ */
.equipo { background: var(--white); }
.equipo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}
.socio-card {
  background: var(--gray-light);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  transition: all var(--transition);
  box-shadow: var(--shadow);
}
.socio-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}
.socio-avatar {
  position: relative;
  width: 100px;
  height: 100px;
  margin: 0 auto 1.5rem;
}
.avatar-initials {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--blue), var(--blue-mid));
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Montserrat', sans-serif;
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--white);
  border: 4px solid var(--orange);
}
.avatar-icon {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 30px;
  height: 30px;
  background: var(--orange);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 0.75rem;
  border: 2px solid var(--white);
}
.socio-info h3 {
  font-family: 'Montserrat', sans-serif;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--blue);
  margin-bottom: 0.3rem;
}
.socio-cargo {
  display: inline-block;
  background: var(--orange);
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.8rem;
  border-radius: 50px;
  margin-bottom: 1rem;
  font-family: 'Montserrat', sans-serif;
  letter-spacing: 0.5px;
}
.socio-info p {
  font-size: 0.9rem;
  color: #555;
  line-height: 1.65;
  margin-bottom: 1.25rem;
}
.socio-contacto a {
  font-size: 0.82rem;
  color: var(--blue-mid);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  transition: color var(--transition);
}
.socio-contacto a:hover { color: var(--orange); }
.equipo-note {
  text-align: center;
  margin-top: 2.5rem;
  font-size: 0.88rem;
  color: var(--gray);
  font-style: italic;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}
.equipo-note .fa-info-circle { color: var(--blue-mid); }

/* ============================================================
   BROCHURE CTA
   ============================================================ */
.brochure-cta {
  background: linear-gradient(135deg, var(--orange) 0%, var(--orange-dark) 100%);
  padding: 4rem 0;
}
.brochure-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}
.brochure-text h2 {
  font-family: 'Montserrat', sans-serif;
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 800;
  color: var(--white);
  margin-bottom: 0.5rem;
}
.brochure-text p {
  color: rgba(255,255,255,0.88);
  font-size: 1rem;
  max-width: 560px;
}
.brochure-cta .btn-primary {
  background: var(--white);
  color: var(--orange);
  border-color: var(--white);
  white-space: nowrap;
}
.brochure-cta .btn-primary:hover {
  background: var(--blue);
  color: var(--white);
  border-color: var(--blue);
}

/* ============================================================
   CONTACTO
   ============================================================ */
.contacto { background: var(--gray-light); }
.contacto-grid {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 3rem;
  align-items: start;
}
.contacto-info h3 {
  font-family: 'Montserrat', sans-serif;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--blue);
  margin-bottom: 2rem;
}
.info-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.info-icon {
  width: 44px;
  height: 44px;
  background: var(--blue);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 1rem;
  flex-shrink: 0;
}
.info-item strong {
  display: block;
  font-family: 'Montserrat', sans-serif;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--gray);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.2rem;
}
.info-item a, .info-item span {
  color: var(--blue);
  font-size: 0.97rem;
  font-weight: 600;
  transition: color var(--transition);
}
.info-item a:hover { color: var(--orange); }
.contacto-brochure {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid #dde2ea;
}
.contacto-brochure p {
  font-size: 0.9rem;
  color: var(--gray);
  margin-bottom: 0.75rem;
}
.contacto-form-wrap {
  background: var(--white);
  border-radius: var(--radius);
  padding: 2.5rem;
  box-shadow: var(--shadow);
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}
.form-group {
  margin-bottom: 1.25rem;
}
.form-group label {
  display: block;
  font-family: 'Montserrat', sans-serif;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--blue);
  margin-bottom: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}
.form-group label span { color: var(--orange); }
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1.5px solid #dde2ea;
  border-radius: 8px;
  font-family: 'Open Sans', sans-serif;
  font-size: 0.95rem;
  color: #2d2d2d;
  background: var(--white);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--blue-mid);
  box-shadow: 0 0 0 3px rgba(46,109,180,0.12);
}
.form-group textarea { resize: vertical; min-height: 130px; }

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--blue);
  color: rgba(255,255,255,0.75);
  padding: 4rem 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-logo { height: 50px; width: auto; margin-bottom: 1rem; }
.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.7;
  max-width: 280px;
}
.footer h4 {
  font-family: 'Montserrat', sans-serif;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--white);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 1.25rem;
}
.footer-links ul li,
.footer-servicios ul li {
  font-size: 0.9rem;
  padding: 0.3rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.footer-links ul li:last-child,
.footer-servicios ul li:last-child { border-bottom: none; }
.footer-links a {
  color: rgba(255,255,255,0.75);
  transition: color var(--transition);
}
.footer-links a:hover { color: var(--orange); }
.footer-contacto ul li {
  font-size: 0.9rem;
  padding: 0.4rem 0;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.footer-contacto ul li:last-child { border-bottom: none; }
.footer-contacto ul li i { color: var(--orange); width: 16px; }
.footer-contacto a {
  color: rgba(255,255,255,0.75);
  transition: color var(--transition);
}
.footer-contacto a:hover { color: var(--orange); }
.footer-brochure-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.5rem;
  background: var(--orange);
  color: var(--white);
  padding: 0.6rem 1.25rem;
  border-radius: 50px;
  font-family: 'Montserrat', sans-serif;
  font-size: 0.82rem;
  font-weight: 700;
  transition: all var(--transition);
}
.footer-brochure-btn:hover {
  background: var(--orange-dark);
  transform: translateY(-2px);
}
.footer-bottom {
  padding: 1.5rem 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.5);
}
.footer-bottom a {
  color: rgba(255,255,255,0.6);
  transition: color var(--transition);
}
.footer-bottom a:hover { color: var(--orange); }

/* ---- FOOTER ANIMATION ---- */
.footer-animation {
  margin-top: 1rem;
  width: 100%;
  max-width: 380px;
}
.caex-animation {
  width: 100%;
  height: auto;
}

/* ============================================================
   BACK TO TOP
   ============================================================ */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 46px;
  height: 46px;
  background: var(--orange);
  color: var(--white);
  border: none;
  border-radius: 50%;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 15px rgba(232,119,34,0.4);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
  z-index: 999;
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}
.back-to-top:hover {
  background: var(--orange-dark);
  transform: translateY(-3px);
}

/* ============================================================
   RESPONSIVE – TABLET
   ============================================================ */
@media (max-width: 1024px) {
  .mv-grid { grid-template-columns: 1fr 1fr; }
  .mv-card:last-child { grid-column: 1 / -1; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .galeria-grid { height: 260px; }
}

@media (max-width: 900px) {
  .nosotros-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .nosotros-image { order: -1; }
  .nosotros-image img { height: 300px; }
  .equipo-grid { grid-template-columns: 1fr 1fr; }
  .servicios-grid { grid-template-columns: 1fr; }
  .contacto-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   RESPONSIVE – MOBILE
   ============================================================ */
@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav-menu {
    position: fixed;
    top: 70px; left: 0; right: 0;
    background: var(--blue);
    flex-direction: column;
    padding: 1.5rem;
    gap: 0.25rem;
    transform: translateY(-110%);
    transition: transform var(--transition);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    z-index: 999;
  }
  .nav-menu.open { transform: translateY(0); }
  .nav-link { padding: 0.75rem 1rem; width: 100%; text-align: center; }
  .btn-brochure { margin-left: 0 !important; margin-top: 0.5rem; }

  .hero-logo { height: 150px; }
  .hero-buttons { flex-direction: column; align-items: center; }

  .mv-grid { grid-template-columns: 1fr; }
  .mv-card:last-child { grid-column: auto; }

  .galeria-grid {
    grid-template-columns: 1fr 1fr;
    height: auto;
  }
  .galeria-item { height: 180px; }

  .equipo-grid { grid-template-columns: 1fr; }

  .form-row { grid-template-columns: 1fr; }

  .brochure-content { flex-direction: column; text-align: center; }
  .brochure-text p { max-width: 100%; }

  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .footer-bottom { flex-direction: column; text-align: center; }

  .nosotros-stats { justify-content: center; }
  .contacto-form-wrap { padding: 1.5rem; }
}

@media (max-width: 480px) {
  .section { padding: 3.5rem 0; }
  .galeria-grid { grid-template-columns: 1fr 1fr; }
  .galeria-item { height: 150px; }
  .hero-content h1 { font-size: 1.8rem; }
  .servicio-card { padding: 1.75rem 1.5rem; }
  .mv-card { padding: 2rem 1.5rem; }
  .socio-card { padding: 1.5rem; }
}