/* ==========================================================
   VARIABLES DE COLOR Y FUENTES
   ========================================================== */
:root {
  --color-principal: #0a2340;     /* Azul muy oscuro/casi negro */
  --color-secundario: #1a4267;    /* Azul medio */
  --color-acento: #4cbf35;        /* Verde brillante */
  --color-claro: #f4f7f6;         /* Blanco grisáceo */
  --color-texto: #d9e2ec;
  --fuente-base: 'Arial', sans-serif;
}

/* ==========================================================
   ESTILOS GLOBALES
   ========================================================== */
body {
  font-family: var(--fuente-base);
  background-color: var(--color-principal);
  color: var(--color-claro);
  padding-top: 70px; /* espacio para navbar fijo */
  margin: 0;
}

/* ==========================================================
   HEADER Y NAVEGACIÓN
   ========================================================== */
#main-nav {
  background-color: var(--color-principal) !important;
}

.navbar-brand .logo-img {
  height: 30px;
}

.nav-link {
  color: var(--color-claro) !important;
  transition: color 0.3s ease;
}

.nav-link:hover {
  color: var(--color-acento) !important;
}

/* ==========================================================
   SECCIÓN HERO
   ========================================================== */
.hero-section {
  position: relative;
  min-height: 90vh;
  background: var(--color-principal);
  overflow: hidden;
  display: flex;
  align-items: center;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    rgba(10, 35, 64, 0.95) 0%,
    rgba(26, 66, 103, 0.85) 100%
  );
  z-index: 1;
}

.hero-section .container {
  position: relative;
  z-index: 2;
}

.hero-section h1 {
  font-size: 2.8rem;
  line-height: 1.2;
  color: var(--color-claro);
}

.hero-section p {
  font-size: 1.3rem;
  color: var(--color-texto);
}

.hero-section .btn-success {
  background-color: var(--color-acento);
  border: none;
  color: #fff;
  padding: 0.7rem 1.8rem;
  border-radius: 50px;
  transition: all 0.3s ease;
}

.hero-section .btn-success:hover {
  background-color: #3aa72b;
  transform: translateY(-3px);
  box-shadow: 0 0 12px rgba(76, 191, 53, 0.4);
}

/* --- Imagen del logo --- */
.logo-hero {
  max-width: 440px;
  width: 100%;
  height: auto;
  transition: transform 0.6s ease, filter 0.6s ease;
}

.logo-hero:hover {
  transform: scale(1.05);
  filter: drop-shadow(0 0 20px rgba(255, 255, 255, 0.5));
}

/* ==========================================================
   SECCIÓN DE SERVICIOS
   ========================================================== */
.services-section {
  background-color: var(--color-principal);
  padding: 60px 0;
}

.service-card {
  background-color: var(--color-secundario);
  color: var(--color-claro);
  border-radius: 8px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
  height: 100%;
  transition: transform 0.3s ease, background-color 0.3s ease;
}

.service-card:hover {
  transform: translateY(-5px);
  background-color: #245a8f;
}

.service-icon {
  font-size: 3rem;
  color: var(--color-acento);
  margin-bottom: 15px;
}

.service-card h4 {
  color: var(--color-acento);
}

.services-section .btn-success {
  background-color: var(--color-acento);
  border: none;
  font-weight: 600;
  transition: background-color 0.3s ease, transform 0.3s ease;
}

.services-section .btn-success:hover {
  background-color: #3a9a2a;
  transform: scale(1.05);
}

/* ==========================================================
   SECCIÓN SOBRE NOSOTROS / CONTACTO
   ========================================================== */
.about-contact-section {
  background-color: var(--color-secundario);
  color: var(--color-claro);
  padding: 60px 0;
}

.about-contact-section h2 {
  color: var(--color-acento);
  margin-bottom: 30px;
  border-bottom: 2px solid var(--color-acento);
  padding-bottom: 10px;
}

.about-content p {
  margin-bottom: 0.8rem;
}

.about-image {
  max-width: 160px;
  border-radius: 12px;
}

.contact-icon {
  font-size: 3rem;
  color: #28a745;
  transition: transform 0.3s ease, color 0.3s ease;
}

.contact-icon:hover {
  color: #52e678;
  transform: scale(1.15);
}

/* ==========================================================
   FOOTER
   ========================================================== */
.footer {
  background-color: var(--color-principal);
  text-align: center;
}

.footer a {
  color: #a0c2e6;
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer a:hover {
  color: var(--color-acento);
}

/* ==========================================================
   MEDIA QUERIES (RESPONSIVIDAD)
   ========================================================== */

/* --- Pantallas medianas (≤ 992px) --- */
@media (max-width: 992px) {
  .hero-section {
    text-align: center;
    padding: 4rem 1rem;
    min-height: auto;
  }

  .hero-section h1 {
    font-size: 2.2rem;
  }

  .logo-hero {
    max-width: 300px;
    margin-top: 2rem;
  }
}

/* --- Pantallas pequeñas (≤ 768px) --- */
@media (max-width: 768px) {
  body {
    padding-top: 60px;
  }

  .hero-section {
    padding: 100px 0 50px;
  }

  .hero-section h1 {
    font-size: 2rem;
  }

  .about-content {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .about-image {
    max-width: 200px;
    margin-bottom: 20px;
  }

  .service-icon {
    font-size: 2.5rem;
  }

  .contact-icon {
    font-size: 2.5rem;
  }
}

/* --- Pantallas muy pequeñas (≤ 576px) --- */
@media (max-width: 576px) {
  .hero-section h1 {
    font-size: 1.8rem;
  }

  .services-section {
    padding: 40px 0;
  }

  .service-card {
    padding: 2rem 1rem;
  }

  .footer p {
    font-size: 0.9rem;
  }
}