:root {
  --azul: #0057a3;
  --azul-claro: #007acc;
  --azul-oscuro: #0a2a5c;
  --blanco: #ffffff;
  --gris: #f5f8fa;
  --gris-oscuro: #333;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--gris-oscuro);
  background: var(--blanco);
}

.container {
  max-width: 1100px;
  margin: auto;
  padding: 20px;
}

header {
  background: var(--azul-oscuro);
  color: var(--blanco);
  padding: 15px 0;
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 1000;
  box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  position: relative;
}

/* Logo personalizado */
.logo {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-principal {
  font-size: 1.8rem;
  font-weight: bold;
  color: var(--blanco);
}

.logo-sub {
  font-size: 0.9rem;
  font-weight: normal;
  color: #d0d0d0; /* plomo plateado */
  letter-spacing: 0.5px;
}

.menu-toggle {
  display: none;
  font-size: 1.8rem;
  background: none;
  color: var(--blanco);
  border: none;
  cursor: pointer;
}

nav ul.nav-list {
  list-style: none;
  display: flex;
  gap: 20px;
}

nav a {
  color: var(--blanco);
  text-decoration: none;
  padding-bottom: 4px;
  transition: border-bottom 0.3s;
}

nav a.active {
  border-bottom: 3px solid var(--blanco);
  font-weight: 600;
}

.hero {
  position: relative;
  background: var(--azul-oscuro);
  color: var(--blanco);
  padding: 100px 20px 60px 20px;
  text-align: center;
  overflow: hidden;
}

#particles-js {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  z-index: 0;
  filter: brightness(1.1) contrast(1.1);
}

.hero .container {
  position: relative;
  z-index: 1;
  max-width: 600px;
  margin: auto;
}

.hero h2,
.hero p {
  margin-bottom: 20px;
}

.servicios {
  background: var(--gris);
  padding: 60px 20px;
}

.cards {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 30px;
}

.card {
  background: var(--blanco);
  padding: 20px;
  border-left: 4px solid var(--azul);
  flex: 1 1 30%;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.nosotros,
.contacto {
  padding: 60px 20px;
}

.contacto form {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.contacto input,
.contacto textarea {
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 4px;
}

footer {
  background: var(--azul-oscuro);
  color: var(--blanco);
  text-align: center;
  padding: 20px;
}

/* Botón flotante WhatsApp */
.whatsapp-float {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background-color: #25d366;
  border-radius: 50%;
  padding: 12px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  z-index: 1000;
  transition: transform 0.3s ease;
}
.whatsapp-float:hover {
  transform: scale(1.1);
}
.whatsapp-float img {
  width: 28px;
  height: 28px;
  display: block;
  filter: invert(1);
}
@media (max-width: 480px) {
  .whatsapp-float {
    padding: 10px;
    bottom: 15px;
    right: 15px;
  }
  .whatsapp-float img {
    width: 24px;
    height: 24px;
  }
}

/* Responsive menú hamburguesa */
@media (max-width: 768px) {
  html {
    scroll-padding-top: 80px;
  }

  .menu-toggle {
    display: block;
    position: absolute;
    right: 20px;
    top: 15px;
  }

  nav ul.nav-list {
    display: none;
    flex-direction: column;
    background: var(--blanco);
    position: absolute;
    top: 60px;
    right: 0;
    width: 200px;
    padding: 15px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    z-index: 1001;
  }

  nav ul.nav-list.show {
    display: flex;
  }

  nav ul.nav-list li {
    margin: 10px 0;
  }

  nav ul.nav-list li a {
    color: var(--azul-oscuro);
    border-bottom: none;
    padding-bottom: 4px;
    transition: border-bottom 0.3s;
  }

  nav ul.nav-list li a.active {
    border-bottom: 3px solid var(--azul-oscuro);
    font-weight: 600;
  }

  nav ul.nav-list li a:hover {
    border-bottom: 3px solid var(--azul-oscuro);
  }

  .cards {
    flex-direction: column;
  }

  .card {
    flex: 1 1 100%;
  }
}