/* SALTA — header. Transparent over the hero, translucent once scrolled.
   Light/dark variants follow the section underneath. */

.header {
  position: fixed;
  inset: 0 0 auto;
  z-index: var(--z-header);
  height: var(--header-h);
  display: flex;
  align-items: center;
  color: var(--white);
  transition: background var(--dur) var(--ease-out),
              color var(--dur) var(--ease-out),
              backdrop-filter var(--dur) var(--ease-out),
              box-shadow var(--dur) var(--ease-out),
              translate var(--dur) var(--ease-out);
}
.header__inner {
  width: min(100% - var(--gutter) * 2, var(--maxw));
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: clamp(1rem, 3vw, 2.5rem);
}

.header.is-compact {
  background: rgba(5, 43, 69, .72);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  box-shadow: 0 1px 0 var(--white-14);
}
/* Over warm-white sections the bar inverts instead of muddying the type. */
.header.is-compact[data-tone="light"] {
  background: rgba(247, 247, 242, .78);
  color: var(--deep);
  box-shadow: 0 1px 0 var(--deep-12);
}
.header.is-hidden { translate: 0 -110%; }

.brand {
  display: flex;
  align-items: baseline;
  gap: .55rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: .16em;
  text-indent: .16em;
  line-height: 1;
}
.brand__mark { color: inherit; }
.brand__dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--lime);
  translate: 0 -.15em;
}

.nav { margin-left: auto; }
.nav__list { display: flex; gap: clamp(1rem, 2.2vw, 2.1rem); }
.nav__link {
  position: relative;
  display: block;
  padding: .4rem 0;
  font-size: var(--t-label);
  font-weight: 600;
  letter-spacing: var(--track-label);
  text-transform: uppercase;
}
/* the underline travels rather than blinks */
.nav__link::after {
  content: '';
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 2px;
  background: var(--lime);
  scale: 0 1;
  transform-origin: right;
  transition: scale var(--dur-fast) var(--ease-out);
}
.nav__link:hover::after,
.nav__link[aria-current='true']::after { scale: 1 1; transform-origin: left; }

.header__actions { display: flex; align-items: center; gap: .9rem; }

.lang {
  display: flex;
  align-items: center;
  gap: .35rem;
  font-size: var(--t-label);
  font-weight: 600;
  letter-spacing: .1em;
}
.lang button { padding: .3rem .15rem; opacity: .55; transition: opacity var(--dur-fast); }
.lang button[aria-pressed='true'] { opacity: 1; color: var(--lime); }
.lang button:hover { opacity: 1; }
.lang span { opacity: .35; }

.header .btn { padding: .85em 1.35em; }

/* --- mobile ----------------------------------------------------------- */
.burger {
  display: none;
  width: 44px; height: 44px;
  margin-right: -10px;
  place-items: center;
  gap: 5px;
  grid-auto-flow: row;
}
.burger span {
  width: 22px; height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: translate var(--dur-fast) var(--ease-out), rotate var(--dur-fast) var(--ease-out), opacity var(--dur-fast);
}
.burger[aria-expanded='true'] span:first-child { translate: 0 7px; rotate: 45deg; }
.burger[aria-expanded='true'] span:nth-child(2) { opacity: 0; }
.burger[aria-expanded='true'] span:last-child { translate: 0 -7px; rotate: -45deg; }

.menu {
  position: fixed;
  inset: 0;
  z-index: 55;
  display: grid;
  align-content: center;
  gap: .4rem;
  padding: var(--header-h) var(--gutter) 2rem;
  background: var(--deep);
  color: var(--white);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur) var(--ease-out);
}
/* Closed state hides the panel with opacity (so it can still fade out) and is
   taken out of the tab order with the `inert` attribute instead of
   `visibility`, which only becomes focusable a frame after the class flips. */
.menu[inert] { pointer-events: none; }
html.is-menu-open .menu { opacity: 1; pointer-events: auto; }
.menu__link {
  display: flex;
  align-items: baseline;
  gap: .9rem;
  padding: .35rem 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 11vw, 3.2rem);
  letter-spacing: -.02em;
  line-height: 1.05;
  text-transform: uppercase;
  translate: 0 24px;
  opacity: 0;
  transition: translate .5s var(--ease-out), opacity .5s var(--ease-out);
  transition-delay: calc(var(--i) * 55ms);
}
html.is-menu-open .menu .menu__link { translate: 0 0; opacity: 1; }
.menu__link .num { color: var(--lime); font-size: .7rem; }
.menu__foot { margin-top: 2rem; display: grid; gap: 1rem; }

@media (max-width: 900px) {
  .nav, .header__actions .btn, .lang { display: none; }
  .burger { display: grid; }
  .header__inner { justify-content: space-between; }
  .header__actions { margin-left: auto; }
}
@media (min-width: 901px) {
  .menu { display: none; }
}