/* ============================================================
   CENTINELA SMART — layout.css
   Header, footer, navegación y estructura de página.
   ============================================================ */

/* ==================== HEADER / NAVEGACIÓN ==================== */

/* El header es transparente al inicio y se vuelve sólido al hacer scroll.
   JS en main.js añade la clase .scrolled cuando el usuario baja. */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 900;
  transition: background var(--transition-base), box-shadow var(--transition-base);
  /* Borde inferior sutil */
  border-bottom: 1px solid transparent;
}

.site-header.scrolled {
  background: rgba(5, 10, 21, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom-color: rgba(0, 245, 212, 0.08);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}

/* Contenedor interno del header */
.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo */
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.nav-logo img {
  height: 44px;
  width: auto;
}

/* Menú de navegación */
.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-link {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-secondary);
  text-decoration: none;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: var(--space-2) 0;
  position: relative;
  transition: color var(--transition-fast);
}

/* Línea animada bajo el link activo o en hover */
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--cyan);
  transition: width var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
  color: var(--cyan);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* CTA en el nav */
.nav-cta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  padding: 0.5rem 1.2rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

/* Botón hamburguesa (solo en móvil) */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: var(--space-2);
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition-base);
  transform-origin: center;
}

/* Animación X cuando el menú está abierto */
.nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ==================== FOOTER ==================== */

.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--bg-border);
  padding: var(--space-16) 0 var(--space-8);
  position: relative;
  overflow: hidden;
}

/* Decoración de fondo en el footer */
.site-footer::before {
  content: '';
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 200px;
  background: radial-gradient(ellipse, rgba(0, 245, 212, 0.05) 0%, transparent 70%);
  pointer-events: none;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

.footer-brand img {
  height: 48px;
  margin-bottom: var(--space-4);
}

.footer-brand p {
  font-size: var(--text-sm);
  color: var(--text-muted);
  max-width: 280px;
  line-height: 1.7;
}

/* Redes sociales */
.footer-social {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.social-link {
  width: 36px;
  height: 36px;
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: var(--text-sm);
  transition: all var(--transition-fast);
  text-decoration: none;
}

.social-link:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: var(--cyan-dim);
}

.footer-col-title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--cyan);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: var(--space-6);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-links a {
  font-size: var(--text-sm);
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.footer-contact-item span:first-child {
  color: var(--cyan);
  flex-shrink: 0;
  margin-top: 2px;
}

/* Línea divisoria del footer inferior */
.footer-bottom {
  border-top: 1px solid var(--bg-border);
  padding-top: var(--space-8);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-bottom p {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

/* Número de versión decorativo (estilo terminal) */
.footer-version {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.footer-version::before {
  content: '//';
  color: var(--cyan);
}

/* ==================== ESPACIADO DE CONTENIDO BAJO NAV ==================== */

/* Añadir padding-top a la primera sección para que no quede tapada por el header fijo */
.page-offset {
  padding-top: var(--nav-height);
}

/* ==================== RESPONSIVE NAV ==================== */

@media (max-width: 768px) {
  .nav-toggle { display: flex; }

  /* El menú en móvil es un panel que desliza desde arriba */
  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(5, 10, 21, 0.98);
    backdrop-filter: blur(12px);
    flex-direction: column;
    align-items: center;
    padding: var(--space-8) var(--space-6);
    gap: var(--space-6);
    border-bottom: 1px solid var(--bg-border);
    /* Oculto por defecto */
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition-base), opacity var(--transition-base);
  }

  /* JS añade clase .open al nav-menu para mostrar el menú */
  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav-link { font-size: var(--text-base); }

  /* Footer en móvil: una columna */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }
}