/* ============================================================
   Admira · nav.css · Header de navegación reutilizable
   Depende de tokens.css.
   Markup mínimo:
     <nav class="admira-nav" aria-label="Navegación principal">
       <a class="admira-nav-brand" href="https://www.admira.app">
         <span class="admira-nav-brand-name">Admira</span>
         <span class="admira-nav-brand-tag">Xperience</span>
       </a>
       <div class="admira-nav-items">
         <a class="admira-nav-link" href="/...">Concepto</a>
         <a class="admira-nav-link admira-nav-link-external" href="https://...">Pixer.IA</a>
         <a class="admira-nav-link admira-nav-link-external" href="https://...">XpaceOS</a>
         <a class="admira-nav-link admira-nav-link-cta" href="mailto:csilva@admira.com">Contacto</a>
       </div>
     </nav>
   ============================================================ */

.admira-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--admira-space-3);
  padding: 0 var(--admira-space-4);
  min-height: 44px;
  line-height: 1;
  background: linear-gradient(180deg, rgba(7, 10, 16, 0.85) 0%, rgba(7, 10, 16, 0) 100%);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

/* Variante: barra en el flujo normal del documento (no fixed) — útil
   para insertar arriba del topnav existente sin solapamiento. Mantiene
   la misma altura (44px) en todos los sitios independientemente del
   line-height heredado del body, para que la banda sea idéntica. */
.admira-nav.admira-nav-static {
  position: static;
  padding: 0 var(--admira-space-4);
  min-height: 44px;
  line-height: 1;
  background:
    linear-gradient(90deg, rgba(170, 136, 255, 0.10) 0%, rgba(80, 200, 255, 0.08) 50%, rgba(255, 216, 102, 0.06) 100%),
    rgba(2, 8, 13, 0.92);
  border-bottom: 1px solid var(--admira-border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

/* ── Brand (logo izquierda) ────────────────────────────────── */
.admira-nav-brand {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  text-decoration: none;
  color: var(--admira-amber);
  font-family: var(--admira-font-mono);
  font-size: 13px;
  line-height: 1;
  letter-spacing: .14em;
  text-transform: uppercase;
  font-weight: 700;
  transition: color var(--admira-tx-fast), text-shadow var(--admira-tx-fast);
}
.admira-nav-brand:hover {
  color: #fff;
  text-shadow: var(--admira-shadow-glow-amber);
}
.admira-nav-brand-name {
  color: var(--admira-amber);
}
.admira-nav-brand-tag {
  color: var(--admira-text-muted);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .28em;
  padding: 1px 6px;
  border: 1px solid var(--admira-border);
  border-radius: var(--admira-radius-sm);
}

/* ── Items (derecha) ───────────────────────────────────────── */
.admira-nav-items {
  display: flex;
  gap: 4px;
  align-items: center;
  flex-wrap: wrap;
}

.admira-nav-link {
  color: rgba(255, 255, 255, .75);
  text-decoration: none;
  font-family: var(--admira-font-sans);
  font-size: 13px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: .02em;
  text-transform: none;
  padding: 7px 12px;
  border-radius: var(--admira-radius-sm);
  border: 1px solid transparent;
  background: rgba(255, 255, 255, .04);
  transition: color var(--admira-tx-fast), background var(--admira-tx-fast), border-color var(--admira-tx-fast), transform var(--admira-tx-fast);
  white-space: nowrap;
}
.admira-nav-link:hover {
  color: #fff;
  background: rgba(255, 255, 255, .10);
  border-color: rgba(255, 255, 255, .20);
  transform: translateY(-1px);
}
.admira-nav-link.admira-nav-link-active {
  color: var(--admira-amber);
  background: rgba(255, 216, 102, .08);
  border-color: var(--admira-border-amber);
}
.admira-nav-link.admira-nav-link-external::before {
  content: "↗ ";
  opacity: 0.85;
  font-weight: 400;
}
.admira-nav-link.admira-nav-link-cta {
  color: #0a0c12;
  background: linear-gradient(135deg, var(--admira-amber), #ffb800);
  border-color: var(--admira-amber);
  font-weight: 700;
  box-shadow: 0 0 16px rgba(255, 216, 102, .35);
}
.admira-nav-link.admira-nav-link-cta:hover {
  filter: brightness(1.1);
  box-shadow: 0 4px 24px rgba(255, 216, 102, .55);
}

@media (max-width: 640px) {
  .admira-nav { padding: 10px 14px; gap: 6px; }
  .admira-nav-brand-tag { display: none; }
  .admira-nav-link { font-size: 12px; padding: 6px 10px; }
  .admira-nav-items { gap: 2px; }
}