/* ============================================================
   NAV.CSS — Menu hamburguesa + resaltado de seccion activa
   (scrollspy). Solo aparece una vez que la carta se abrio (etapa
   2), lo controla nav.js agregando .inv-nav-toggle--visible.
   ============================================================ */

:root {
  --nav-btn-size: 46px;
  --nav-transition: 0.35s cubic-bezier(0.34, 1.3, 0.64, 1);
}

/* ── BOTON HAMBURGUESA ─────────────────────────────────────── */
.inv-nav-toggle {
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 999;
  width: var(--nav-btn-size);
  height: var(--nav-btn-size);
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(15,12,26,0.75);
  backdrop-filter: blur(8px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.45);   /* look "flotante" sobre el contenido */
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  /* Oculto hasta que nav.js confirme que la carta ya se abrio --
     evita mostrar un menu de navegacion mientras el invitado
     todavia esta en la etapa 1 (carta cerrada). */
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}

.inv-nav-toggle--visible { opacity: 1; pointer-events: auto; }

.inv-nav-toggle:focus { outline: none; }
.inv-nav-toggle:focus-visible { outline: 2px solid var(--gold); outline-offset: 3px; }

/* Icono de 3 barras que se convierte en X cuando el menu esta abierto */
.inv-nav-toggle-bars {
  position: relative;
  width: 20px;
  height: 14px;
}

.inv-nav-toggle-bars span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: var(--gold);
  transition: transform var(--nav-transition), opacity 0.2s ease;
}

.inv-nav-toggle-bars span:nth-child(1) { top: 0; }
.inv-nav-toggle-bars span:nth-child(2) { top: 6px; }
.inv-nav-toggle-bars span:nth-child(3) { top: 12px; }

.inv-nav-toggle.open .inv-nav-toggle-bars span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.inv-nav-toggle.open .inv-nav-toggle-bars span:nth-child(2) { opacity: 0; }
.inv-nav-toggle.open .inv-nav-toggle-bars span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ── MENU DE PANTALLA COMPLETA ─────────────────────────────── */
.inv-nav-menu {
  position: fixed;
  inset: 0;
  z-index: 998;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 28px;
  background: rgba(15,12,26,0.96);
  backdrop-filter: blur(10px);
  opacity: 0;
  visibility: hidden;
  transform: scale(0.96);
  transition: opacity var(--nav-transition), transform var(--nav-transition), visibility 0s linear var(--nav-transition);
}

.inv-nav-menu.open {
  opacity: 1;
  visibility: visible;
  transform: scale(1);
  transition: opacity var(--nav-transition), transform var(--nav-transition);
}

.inv-nav-menu a {
  font-family: 'Georgia', serif;
  font-size: 1.3rem;
  letter-spacing: 0.04em;
  color: #f5f0e8;
  text-decoration: none;
  padding: 6px 12px;
  position: relative;
  -webkit-tap-highlight-color: transparent;
}

.inv-nav-menu a:focus { outline: none; }
.inv-nav-menu a:focus-visible { outline: 2px solid var(--gold); outline-offset: 4px; border-radius: 6px; }

/* Seccion activa (scrollspy) -- se pinta de dorado + un puntito
   guia a la izquierda para que se note incluso sin fijarse en el
   color (accesibilidad: no depender solo del color). */
.inv-nav-menu a.active {
  color: var(--gold);
  font-style: italic;
}

.inv-nav-menu a.active::before {
  content: '';
  position: absolute;
  left: -14px;
  top: 50%;
  transform: translateY(-50%);
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--gold);
}

@media (prefers-reduced-motion: reduce) {
  .inv-nav-toggle,
  .inv-nav-toggle-bars span,
  .inv-nav-menu {
    transition: none !important;
  }
}