/* Cabecera fija. Sobre el papel no necesita sombra: un filete aparece
   solo cuando el contenido empieza a pasar por debajo. */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--niebla);
  border-bottom: 1px solid transparent;
  padding-top: env(safe-area-inset-top, 0px);
  transition: border-color var(--t-ui) ease;
}

.site-header.is-scrolled {
  border-bottom-color: var(--rule);
}

.site-header__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: calc(var(--u) * 3);
  min-height: 4.5rem;
}

.site-header__logo {
  display: block;
  flex: none;
  border-radius: var(--r-xs);
}

.site-header__logo img {
  width: auto;
  height: 2.125rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: calc(var(--u) * 4);
}

.site-nav__list {
  display: flex;
  gap: calc(var(--u) * 3.5);
}

.site-nav__list a {
  position: relative;
  display: block;
  padding-block: var(--u);
  color: var(--ink-2);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  transition: color var(--t-ui) ease;
}

.site-nav__list a::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 2px;
  height: 1.5px;
  background: var(--duoris);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 260ms var(--ease-out);
}

.site-nav__list a[aria-current='true'] {
  color: var(--ink);
}

.site-nav__list a[aria-current='true']::after {
  transform: scaleX(1);
}

@media (hover: hover) and (pointer: fine) {
  .site-nav__list a:hover {
    color: var(--ink);
  }
}

.site-nav__cta {
  min-height: 2.75rem;
  font-size: 0.9375rem;
}

.site-header__toggle {
  display: none;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  margin-right: calc(var(--u) * -1);
  padding: 0;
  border: 0;
  border-radius: var(--r-sm);
  background: transparent;
  color: var(--ink);
  transition: transform var(--t-press) var(--ease-out);
}

.site-header__toggle:active {
  transform: scale(0.94);
}

.site-header__toggle .icon {
  width: 1.5rem;
  height: 1.5rem;
}

/* ---------- Móvil: el menú baja como una hoja ---------- */
@media (max-width: 56rem) {
  .site-header__toggle {
    display: grid;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: calc(var(--u) * 3);
    padding: calc(var(--u) * 2) var(--gutter) calc(var(--u) * 4 + env(safe-area-inset-bottom, 0px));
    background: var(--niebla);
    border-bottom: 1px solid var(--rule);
    box-shadow: 0 24px 40px -24px rgb(14 26 58 / 0.25);
    max-height: calc(100dvh - 4.5rem);
    overflow-y: auto;
    overscroll-behavior: contain;
    visibility: hidden;
    opacity: 0;
    transform: translateY(-8px);
    transition:
      opacity 220ms var(--ease-out),
      transform 220ms var(--ease-out),
      visibility 0s linear 220ms;
  }

  .site-nav.is-open {
    visibility: visible;
    opacity: 1;
    transform: none;
    transition:
      opacity 260ms var(--ease-out),
      transform 260ms var(--ease-out),
      visibility 0s;
  }

  .site-nav__list {
    flex-direction: column;
    gap: 0;
  }

  .site-nav__list li + li {
    border-top: 1px solid var(--rule);
  }

  .site-nav__list a {
    padding-block: calc(var(--u) * 2);
    font-size: 1.375rem;
    font-weight: 600;
    font-variation-settings: var(--display);
    letter-spacing: -0.015em;
    color: var(--ink);
  }

  .site-nav__list a::after {
    display: none;
  }

  .site-nav__cta {
    min-height: 3.25rem;
    font-size: 1rem;
  }
}