.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h-mobile);
  display: flex;
  align-items: center;
  z-index: var(--z-nav);
  background-color: transparent;
  border-bottom: 1px solid transparent;
  border-radius: 0;
  /* NOTE: nada de transform/will-change en default — eso crea containing block
     y rompe el position:fixed del .nav-primary mobile overlay. */
  transition:
    background-color var(--duration-base) var(--ease-out),
    border-color var(--duration-base) var(--ease-out),
    border-radius var(--duration-base) var(--ease-out),
    top 350ms var(--ease-out),
    left var(--duration-base) var(--ease-out),
    right var(--duration-base) var(--ease-out),
    height var(--duration-base) var(--ease-out);
}

.site-header.is-scrolled,
.site-header.is-nav-open {
  top: 0;
  left: 0;
  right: 0;
  border-radius: 0;
  background-color: var(--surface-dark);
  border-bottom-color: var(--surface-dark);
}

/* Hide on scroll-down — slides up via `top` (no containing block side effect).
   Debe ir DESPUÉS de .is-scrolled para ganar la cascada (misma specificity). */
.site-header.is-hidden {
  top: calc(-1 * var(--header-h-mobile) - 8px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  width: 100%;
}

.site-header__logo {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  position: relative;
  z-index: 2;
}

.site-header__logo-img {
  height: 22px;
  width: auto;
  display: block;
  transition: opacity 220ms var(--ease-out);
}

/* Mini se posiciona absolute sobre el full, alineado al left.
   El full logo en flow normal define el ancho del wrapper. */
.site-header__logo-img--mini {
  position: absolute;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
  opacity: 0;
}

/* Cross-fade en is-scrolled */
.site-header.is-scrolled .site-header__logo-img--full {
  opacity: 0;
}
.site-header.is-scrolled .site-header__logo-img--mini {
  opacity: 1;
}

/* ─── Nav primary (desktop default + mobile overlay) ─── */
.nav-primary {
  position: fixed;
  inset: 0;
  background: var(--surface-dark);
  color: var(--text-on-dark); /* Override del body claro — todo descendiente hereda blanco */
  padding: calc(var(--header-h-mobile) + var(--space-6)) var(--container-pad-mobile) var(--space-7);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  visibility: hidden;
  opacity: 0;
  transform: translateY(-12px);
  transition:
    opacity var(--duration-base) var(--ease-out),
    transform var(--duration-base) var(--ease-out),
    visibility 0s linear var(--duration-base);
  z-index: 1;
}

.site-header.is-nav-open .nav-primary {
  visibility: visible;
  opacity: 1;
  transform: translateY(0);
  transition:
    opacity var(--duration-base) var(--ease-out),
    transform var(--duration-base) var(--ease-out),
    visibility 0s linear 0s;
}

.nav-primary__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  list-style: none;
  margin: 0;
  padding: 0;
  width: 100%;
}

.nav-primary__item {
  border-bottom: 1px solid var(--border-on-dark);
  opacity: 0;
  transform: translateY(8px);
  transition:
    opacity var(--duration-base) var(--ease-out),
    transform var(--duration-base) var(--ease-out);
}

.site-header.is-nav-open .nav-primary__item {
  opacity: 1;
  transform: translateY(0);
}

.site-header.is-nav-open .nav-primary__item:nth-child(1) { transition-delay: 60ms; }
.site-header.is-nav-open .nav-primary__item:nth-child(2) { transition-delay: 120ms; }
.site-header.is-nav-open .nav-primary__item:nth-child(3) { transition-delay: 180ms; }
.site-header.is-nav-open .nav-primary__item:nth-child(4) { transition-delay: 240ms; }
.site-header.is-nav-open .nav-primary__item:nth-child(5) { transition-delay: 320ms; }

.nav-primary__item--mobile-cta {
  border-bottom: none;
  margin-top: var(--space-5);
}

.nav-primary__link,
.nav-primary__sub-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  font-family: inherit;
  font-size: var(--text-lg);
  font-weight: var(--weight-medium);
  color: var(--text-on-dark);
  letter-spacing: var(--tracking-normal);
  padding: var(--space-4) 0;
  position: relative;
  background: transparent;
  border: 0;
  cursor: pointer;
  text-align: left;
  transition: color var(--duration-base) var(--ease-out);
}

.nav-primary__link:hover,
.nav-primary__sub-toggle:hover,
.nav-primary__sub-toggle[aria-expanded="true"] {
  color: var(--color-accent);
}

/* Chevron icon for submenu trigger */
.nav-primary__chev {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform var(--duration-base) var(--ease-out);
  flex-shrink: 0;
  margin-left: var(--space-3);
}

.nav-primary__sub-toggle[aria-expanded="true"] .nav-primary__chev {
  transform: rotate(225deg) translate(-2px, -2px);
}

/* Submenu (mobile collapse + desktop dropdown) */
.nav-primary__submenu {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
  max-height: 0;
  overflow: hidden;
  transition:
    max-height var(--duration-slow) var(--ease-out),
    opacity var(--duration-base) var(--ease-out);
  opacity: 0;
}

.nav-primary__sub-toggle[aria-expanded="true"] + .nav-primary__submenu {
  max-height: 640px;
  opacity: 1;
}

.nav-primary__sub-link {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4) 0 var(--space-4) var(--space-5);
  text-decoration: none;
  color: var(--text-on-dark); /* Override defensivo contra cascade del body */
  border-left: 2px solid var(--color-accent);
  margin-bottom: var(--space-3);
  transition: border-color var(--duration-base) var(--ease-out), color var(--duration-base) var(--ease-out);
}

.nav-primary__sub-link:hover {
  border-color: #FFFFFF;
}

.nav-primary__sub-title {
  font-size: var(--text-md); /* 18px mobile (mejor lectura) */
  font-weight: var(--weight-bold);
  color: var(--text-on-dark);
  line-height: var(--lh-tight);
}

.nav-primary__sub-tag {
  font-size: 0.6875rem; /* 11px mobile */
  font-weight: var(--weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
}

/* Group label inside submenu (decorative, presentational) */
.nav-primary__sub-group-label {
  font-size: 0.6875rem; /* 11px mobile — match sub-tag */
  font-weight: var(--weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-on-dark);
  opacity: 0.45;
  padding: var(--space-3) 0 var(--space-2) var(--space-5);
}

/* Divider between submenu groups */
.nav-primary__sub-divider {
  height: 1px;
  background: var(--border-on-dark);
  margin: var(--space-3) 0;
  padding: 0;
  border: 0;
}

.nav-primary__cta {
  width: 100%;
  justify-content: space-between;
}

.site-header__cta {
  flex-shrink: 0;
  display: none;
}

/* ─── Burger toggle ─── */
.nav-toggle {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text-on-dark);
  border-radius: var(--radius-sm);
  background: transparent;
  border: 0;
  cursor: pointer;
  position: relative;
  z-index: 2;
}

.nav-toggle__bars,
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--duration-base) var(--ease-out), top var(--duration-base) var(--ease-out), opacity var(--duration-base) var(--ease-out);
}

.nav-toggle__bars {
  position: relative;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle__bars::before { top: -7px; }
.nav-toggle__bars::after  { top:  7px; }

/* Burger → X transform */
.site-header.is-nav-open .nav-toggle__bars {
  background: transparent;
}
.site-header.is-nav-open .nav-toggle__bars::before {
  top: 0;
  transform: rotate(45deg);
}
.site-header.is-nav-open .nav-toggle__bars::after {
  top: 0;
  transform: rotate(-45deg);
}

/* Body scroll lock when menu open */
body.has-nav-open {
  overflow: hidden;
}

@media (prefers-reduced-motion: reduce) {
  .nav-primary,
  .nav-primary__item,
  .nav-primary__submenu,
  .nav-primary__chev,
  .nav-toggle__bars,
  .nav-toggle__bars::before,
  .nav-toggle__bars::after {
    transition: none;
  }
}

/* ─── Desktop ≥ 1024px ─── */
@media (min-width: 1024px) {
  .site-header {
    height: var(--header-h-desktop);
    top: var(--stage-pad-desktop);
    left: var(--stage-pad-desktop);
    right: var(--stage-pad-desktop);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    overflow: visible;
  }

  .site-header.is-scrolled {
    height: var(--header-h-desktop);
    top: 0;
    left: 0;
    right: 0;
    border-radius: 0;
  }

  .site-header.is-hidden {
    top: calc(-1 * var(--header-h-desktop) - 16px);
  }

  .site-header__logo-img { height: 26px; }

  /* Reset nav-primary to inline desktop */
  .nav-primary {
    position: static;
    inset: auto;
    background: transparent;
    padding: 0;
    display: flex;
    flex-direction: row;
    overflow: visible;
    visibility: visible;
    opacity: 1;
    transform: none;
    transition: none;
    z-index: auto;
  }

  .nav-primary__list {
    flex-direction: row;
    gap: var(--space-6);
    align-items: center;
  }

  .nav-primary__item {
    border-bottom: none;
    opacity: 1;
    transform: none;
    transition: none;
    position: relative;
  }

  .nav-primary__link,
  .nav-primary__sub-toggle {
    font-size: var(--text-base);
    padding: var(--space-2) 0;
    width: auto;
  }

  /* Underline effect on desktop links */
  .nav-primary__link::after,
  .nav-primary__sub-toggle::after {
    content: "";
    position: absolute;
    left: 0;
    right: 18px;
    bottom: 2px;
    height: 1px;
    background: currentColor;
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform var(--duration-base) var(--ease-out);
  }

  .nav-primary__sub-toggle::after { right: 18px; }
  .nav-primary__link::after { right: 0; }

  .nav-primary__link:hover::after,
  .nav-primary__sub-toggle:hover::after,
  .nav-primary__sub-toggle[aria-expanded="true"]::after,
  .nav-primary__link[aria-current="page"]::after {
    transform: scaleX(1);
  }

  .nav-primary__chev {
    width: 8px;
    height: 8px;
    margin-left: var(--space-2);
    transform: rotate(45deg) translate(-1px, -1px);
  }

  .nav-primary__sub-toggle[aria-expanded="true"] .nav-primary__chev {
    transform: rotate(225deg) translate(-1px, -1px);
  }

  /* Desktop dropdown submenu */
  .nav-primary__submenu {
    position: absolute;
    top: calc(100% + var(--space-3));
    left: -16px;
    min-width: 280px;
    max-height: none;
    background: var(--surface-dark);
    border: 1px solid var(--border-on-dark);
    border-radius: var(--radius-md);
    padding: var(--space-3);
    opacity: 0;
    transform: translateY(-8px);
    pointer-events: none;
    transition:
      opacity var(--duration-base) var(--ease-out),
      transform var(--duration-base) var(--ease-out);
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.32);
  }

  /* Invisible bridge — keeps hover continuous from trigger to dropdown */
  .nav-primary__submenu::before {
    content: "";
    position: absolute;
    top: -12px;
    left: 0;
    right: 0;
    height: 12px;
    background: transparent;
  }

  /* Bridge below trigger — keeps :hover alive while crossing the gap to dropdown */
  .nav-primary__item--has-submenu::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    height: var(--space-3);
    background: transparent;
  }

  .nav-primary__sub-toggle[aria-expanded="true"] + .nav-primary__submenu,
  .nav-primary__item--has-submenu:hover .nav-primary__submenu {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-primary__sub-link {
    padding: var(--space-3) var(--space-4);
    border-left: 2px solid transparent;
    margin: 0;
    border-radius: var(--radius-sm);
    transition: background-color var(--duration-base) var(--ease-out), border-color var(--duration-base) var(--ease-out);
  }

  .nav-primary__sub-link:hover {
    background-color: rgba(255, 255, 255, 0.04);
    border-color: var(--color-accent);
  }

  /* Reset desktop submenu typography */
  .nav-primary__sub-title {
    font-size: var(--text-base); /* 16px desktop */
  }

  .nav-primary__sub-tag {
    font-size: 0.625rem; /* 10px desktop */
  }

  .nav-primary__sub-group-label {
    font-size: 0.625rem; /* 10px desktop */
    padding: var(--space-2) var(--space-4) var(--space-1);
  }

  .nav-primary__sub-divider {
    margin: var(--space-2) var(--space-2);
  }

  .nav-primary__item--mobile-cta {
    display: none;
  }

  .site-header__cta {
    display: inline-flex;
  }

  .nav-toggle {
    display: none;
  }

  body.has-nav-open {
    overflow: visible;
  }
}