/* ============================================================
   NAV — Navegación principal
   ============================================================ */

#nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2.5rem;
  height: 56px;
  border-bottom: 1px solid transparent;
  transition: background 0.3s, border-color 0.3s;
}

#nav.scrolled       { background: var(--bg);     border-color: var(--border); }
#nav.dark           { background: transparent; }
#nav.dark.scrolled  { background: var(--bg-dark); border-color: var(--border-dark); }

/* ── Logo imagen ── */
.logo-blanco, .logo-negro {
  height: 36px;
  object-fit: contain;
  display: block;
}
#nav.dark       .logo-blanco { display: block; }
#nav.dark       .logo-negro  { display: none;  }
#nav:not(.dark) .logo-blanco { display: none;  }
#nav:not(.dark) .logo-negro  { display: block; }

/* ── Links centro ── */
.nav-center {
  display: flex;
  gap: 2rem;
  list-style: none;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}
.nav-center a {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
  opacity: 0.6;
  transition: opacity 0.2s;
}
.nav-center a:hover { opacity: 1; }

/* ── Derecha ── */
.nav-right { display: flex; align-items: center; gap: 1.5rem; }

.nav-cta {
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 700;
  border: 1.5px solid currentColor;
  padding: 0.45rem 1.1rem;
  transition: background 0.2s, color 0.2s;
}
.nav-cta:hover            { background: var(--text);    color: var(--bg); }
#nav.dark .nav-cta:hover  { background: var(--text-inv); color: var(--bg-dark); }