/* ══ Barra de navegación principal (liquid-glass) ══
   Componente compartido por la landing y el Manual de IA. Se carga junto a
   css/style.css en la landing y junto a manual-ia/manual.css en el Manual,
   por lo que no puede depender de reglas base de ninguna de las dos: todo lo
   que necesita esta declarado aqui. */

#side-nav {
  position: fixed;
  left: clamp(16px, 2.6vw, 40px);
  top: clamp(16px, 2.4vh, 34px);
  /* manual.css declara `nav { margin-left: auto }` para su maquetado propio.
     El componente no debe depender de quien lo hospede. */
  margin: 0;
  z-index: 100;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 2px;
  padding: 10px 14px;
  border-radius: 28px;
  border: 1px solid transparent;
  background: transparent;
  box-shadow: none;
  transition: background 700ms cubic-bezier(.19,1,.22,1),
              border-color 700ms cubic-bezier(.19,1,.22,1),
              box-shadow 700ms cubic-bezier(.19,1,.22,1),
              padding 700ms cubic-bezier(.19,1,.22,1),
              backdrop-filter 700ms cubic-bezier(.19,1,.22,1),
              -webkit-backdrop-filter 700ms cubic-bezier(.19,1,.22,1);
}

#side-nav.is-open {
  padding: 12px 22px;
  background: rgba(251,250,246,.5);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  backdrop-filter: blur(20px) saturate(180%);
  border-color: rgba(0,26,79,.14);
  box-shadow: 0 12px 42px rgba(0,26,79,.15), inset 0 1px 0 rgba(255,255,255,.65);
}
#side-nav.on-dark.is-open {
  background: rgba(0,26,79,.34);
  border-color: rgba(251,250,246,.22);
  box-shadow: 0 12px 42px rgba(0,0,0,.32), inset 0 1px 0 rgba(255,255,255,.2);
}

.sn-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 10px;
  color: #001A4F;
  /* manual.css subraya los enlaces por defecto; aqui nunca. */
  text-decoration: none;
  transition: color 500ms ease;
}
#side-nav.on-dark .sn-item { color: #FBFAF6; }
#side-nav.on-dark:not(.is-open) .sn-dot { box-shadow: 0 0 10px rgba(0,26,79,.9); }
.sn-item:hover { color: #006FC9; text-decoration: none; }
#side-nav.on-dark .sn-item:hover { color: #FBFAF6; }

.sn-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  opacity: .5;
  flex-shrink: 0;
  transition: opacity 400ms ease, transform 500ms cubic-bezier(.16,1,.3,1);
}
.sn-item:hover .sn-dot { opacity: 1; transform: scale(1.6); }
.sn-item.is-current .sn-dot { opacity: 1; transform: scale(1.5); }

.sn-label {
  font-family: Manrope, sans-serif;
  font-weight: 400;
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  white-space: nowrap;
  opacity: 0;
  max-width: 0;
  overflow: hidden;
  transform: translateX(-8px);
  transition: opacity 500ms ease,
              max-width 700ms cubic-bezier(.19,1,.22,1),
              transform 700ms cubic-bezier(.19,1,.22,1);
}
#side-nav.is-open .sn-label { opacity: .55; max-width: 260px; transform: none; }
#side-nav.is-open .sn-item:hover .sn-label,
#side-nav.is-open .sn-item.is-current .sn-label { opacity: 1; }

/* Conversemos — último ítem destacado */
.sn-cta { margin-left: 8px; padding-left: 16px; border-left: 1px solid rgba(0,26,79,.16); }
#side-nav.on-dark .sn-cta { border-left-color: rgba(251,250,246,.22); }
.sn-cta .sn-dot { background: #FFB900; opacity: 1; }
.sn-cta:hover .sn-dot { transform: scale(1.7); }
.sn-cta .sn-label { font-weight: 600; }
#side-nav.is-open .sn-cta .sn-label { opacity: 1; }

/* Teclado: abrir al enfocar cualquier ítem */
#side-nav:focus-within { padding: 12px 22px; background: rgba(251,250,246,.5); -webkit-backdrop-filter: blur(20px) saturate(180%); backdrop-filter: blur(20px) saturate(180%); border-color: rgba(0,26,79,.14); }
#side-nav:focus-within .sn-label { opacity: .55; max-width: 260px; transform: none; }

/* Pantallas angostas: la barra abierta cae como panel vertical */
@media (max-width: 860px) {
  #side-nav.is-open,
  #side-nav:focus-within {
    flex-direction: column;
    align-items: flex-start;
    padding: 14px 18px;
    border-radius: 22px;
  }
  #side-nav.is-open .sn-item,
  #side-nav:focus-within .sn-item { padding: 6px 0; }
  #side-nav.is-open .sn-cta,
  #side-nav:focus-within .sn-cta {
    margin: 6px 0 0;
    padding: 12px 0 0;
    border-left: 0;
    border-top: 1px solid rgba(0,26,79,.16);
  }
  #side-nav.on-dark.is-open .sn-cta { border-top-color: rgba(251,250,246,.22); }
}
@media (max-width: 720px) {
  #side-nav { left: 10px; top: 10px; gap: 0; padding: 8px 10px; }
  .sn-item { padding: 4px 7px; }
}

@media (prefers-reduced-motion: reduce) {
  #side-nav, .sn-label, .sn-dot { transition: none !important; }
}

/* Al imprimir el Manual la barra no debe aparecer. */
@media print {
  #side-nav { display: none !important; }
}