/* ==========================================================================
   NEXURA — Header, navegación y footer (compartidos en las 4 páginas)
   ========================================================================== */

/* ---------- Header / Nav ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  display: flex;
  align-items: center;
  background: rgba(13, 13, 13, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.navbar {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: var(--space-xl);
}

.nav-brand {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.nav-brand img {
  height: 52px;
  width: auto;
  transition: filter var(--transition-base);
}

.nav-brand:hover img {
  filter: drop-shadow(0 0 8px rgba(0, 229, 255, 0.5));
}

.nav-menu {
  display: flex;
  align-items: center;
  flex: 1;
  gap: var(--space-lg);
}

.nav-link {
  position: relative;
  font-size: var(--fs-small);
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--color-text);
  padding: var(--space-xs) 0;
  transition: color var(--transition-base);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  box-shadow: var(--shadow-neon);
  transition: width var(--transition-base);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-accent);
}

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

.nav-link.is-active {
  color: var(--color-accent);
}

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

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-left: auto;
}

/* Botón hamburguesa (oculto en desktop) */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  flex-shrink: 0;
  gap: 5px;
  width: 40px;
  height: 40px;
  z-index: 110;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base), background-color var(--transition-base);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
  background: var(--color-accent);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
  background: var(--color-accent);
}

@media (max-width: 860px) {
  .nav-toggle {
    display: flex;
  }

  .navbar {
    justify-content: space-between;
    gap: var(--space-sm);
  }

  .nav-menu {
    position: fixed;
    inset: 0 0 0 auto;
    width: min(320px, 80vw);
    height: 100vh;
    background: var(--color-bg-alt);
    border-left: 1px solid var(--color-border);
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: var(--space-lg);
    padding: var(--space-xl) var(--space-lg);
    transform: translateX(100%);
    transition: transform var(--transition-base);
  }

  .nav-menu.is-open {
    transform: translateX(0);
  }

  .nav-link::after {
    display: none;
  }

  .nav-cta {
    width: 100%;
    justify-content: center;
  }

  body.nav-open {
    overflow: hidden;
  }
}

/* Overlay que oscurece el fondo cuando el menú móvil está abierto */
.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
  z-index: 99;
}

.nav-overlay.is-visible {
  opacity: 1;
  pointer-events: auto;
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-alt);
  padding-block: var(--space-2xl) var(--space-lg);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 1fr;
  gap: var(--space-lg);
  padding-bottom: var(--space-lg);
}

@media (max-width: 860px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 520px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-brand img {
  height: 34px;
  margin-bottom: var(--space-sm);
}

.footer-brand p {
  max-width: 30ch;
  font-size: var(--fs-small);
}

.footer-heading {
  font-family: var(--font-heading);
  font-size: var(--fs-small);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-white);
  margin-bottom: var(--space-sm);
}

.footer-links li {
  margin-bottom: var(--space-xs);
}

.footer-links a {
  font-size: var(--fs-small);
  color: var(--color-text-muted);
  transition: color var(--transition-base);
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--color-accent);
}

.footer-social {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
}

.footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  transition: border-color var(--transition-base), color var(--transition-base), box-shadow var(--transition-base);
}

.footer-social a:hover,
.footer-social a:focus-visible {
  color: var(--color-accent);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-neon);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  font-size: var(--fs-small);
  color: var(--color-text-muted);
}

.footer-legal {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.footer-legal a {
  color: var(--color-text-muted);
  transition: color var(--transition-base);
}

.footer-legal a:hover,
.footer-legal a:focus-visible {
  color: var(--color-accent);
}