/* ─── Navigation ─── */
.nav {
  position: fixed;
  top: var(--marquee-h); left: 0; right: 0;
  height: var(--nav-h);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 var(--space-md);
  z-index: var(--z-nav);
  transition: background var(--dur-slow) var(--ease),
              color var(--dur-slow) var(--ease);
  mix-blend-mode: normal; /* se controla vía JS según fondo */
}

/* Estado transparente sobre el hero */
.nav--transparent {
  background: transparent;
  color: var(--color-bone);
}

/* Estado sólido al hacer scroll */
.nav--solid {
  background: var(--color-bone);
  color: var(--color-black);
  border-bottom: 1px solid rgba(10, 10, 10, 0.18);
  box-shadow: 0 2px 28px rgba(10, 10, 10, 0.09);
}

/* ─── Logo ─── */
.nav__logo-link {
  font-family: var(--font-sans);
  font-size: var(--size-sm);
  font-weight: 600;
  letter-spacing: 0.25em;
  text-transform: uppercase;
}

/* ─── Links ─── */
.nav__links {
  display: flex;
  align-items: center;
  gap: 2.5rem;
}

.nav__item { position: relative; }

.nav__link {
  font-family: var(--font-sans);
  font-size: var(--size-sm);
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 0.25rem 0;
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 1px;
  background: currentColor;
  transition: width var(--dur-base) var(--ease);
}
.nav__link:hover::after,
.nav__item--active .nav__link::after { width: 100%; }

/* ─── Actions ─── */
.nav__actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  justify-self: end;
}

.nav__action {
  display: flex;
  align-items: center;
  justify-content: center;
  color: inherit;
  padding: 0.25rem;
  position: relative;
  transition: opacity var(--dur-fast) var(--ease);
}
.nav__action:hover { opacity: 0.65; }

.nav__cart-count {
  position: absolute;
  top: -6px; right: -8px;
  width: 16px; height: 16px;
  background: var(--color-black);
  color: var(--color-bone);
  border-radius: 50%;
  font-size: 9px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--dur-slow) var(--ease);
}
.nav--transparent .nav__cart-count {
  background: var(--color-bone);
  color: var(--color-black);
}

@media (max-width: 768px) {
  .nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 var(--space-sm);
  }
  .nav__links { display: none; }
}