/* ==========================================================================
   Site header
   Transparent over the hero, then a blurred paper backdrop on scroll.
   ========================================================================== */

.gx-header {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 100;
  background: transparent;
  border-block-end: var(--gx-hairline) solid transparent;
  transition:
    background-color   var(--gx-dur-std) var(--gx-ease-enter),
    border-color       var(--gx-dur-std) var(--gx-ease-enter),
    backdrop-filter    var(--gx-dur-std) var(--gx-ease-enter),
    transform          var(--gx-dur-std) var(--gx-ease-enter);
}

.gx-header.is-solid {
  background-color: color-mix(in srgb, var(--gx-paper) 82%, transparent);
  backdrop-filter: blur(14px) saturate(1.4);
  -webkit-backdrop-filter: blur(14px) saturate(1.4);
  border-block-end-color: color-mix(in srgb, var(--gx-ink) 14%, transparent);
}

/* Browsers without backdrop-filter get an opaque bar rather than mud. */
@supports not (backdrop-filter: blur(4px)) {
  .gx-header.is-solid { background-color: var(--gx-paper); }
}

.gx-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gx-space-m);
  max-width: 90rem;
  margin-inline: auto;
  padding: var(--gx-space-s) var(--gx-gutter);
  min-block-size: 4.5rem;
}

/* --- Wordmark ----------------------------------------------------------- */

.gx-wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: 0.32rem;
  font-family: var(--gx-font-display);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.045em;
  line-height: 1;
  color: var(--gx-ink);
  text-decoration: none;
  font-variation-settings: "opsz" 24;
}

/* The registration dot. The one place the print idea shows in the chrome. */
.gx-wordmark__mark {
  inline-size: 0.42rem;
  block-size: 0.42rem;
  border-radius: 50%;
  background: var(--gx-press);
  transition: background-color var(--gx-dur-std) var(--gx-ease-enter);
}

.gx-wordmark:hover .gx-wordmark__mark { background: var(--gx-turmeric); }

/* --- Desktop nav -------------------------------------------------------- */

.gx-nav { display: none; }

.gx-nav__list {
  display: flex;
  align-items: center;
  gap: var(--gx-space-m);
  list-style: none;
  margin: 0;
  padding: 0;
}

.gx-nav__link {
  position: relative;
  font-family: var(--gx-font-utility);
  font-size: var(--gx-size-label);
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--gx-ink);
  padding-block: 0.35rem;
}

/* Underline draws left to right. transform only, so it composites. */
.gx-nav__link::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  inset-block-end: 0;
  block-size: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--gx-dur-std) var(--gx-ease-enter);
}

.gx-nav__link:hover::after,
.gx-nav__link:focus-visible::after { transform: scaleX(1); }

.gx-nav__link[aria-current="page"] { color: var(--gx-press); }
.gx-nav__link[aria-current="page"]::after { transform: scaleX(1); }

/* --- Header CTA --------------------------------------------------------- */

.gx-header__cta {
  display: none;
  padding: 0.8rem 1.5rem;
  will-change: transform;
}

/* --- Burger ------------------------------------------------------------- */

.gx-burger {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.36rem;
  inline-size: 2.75rem;
  block-size: 2.75rem;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.gx-burger__bar {
  display: block;
  inline-size: 1.5rem;
  block-size: 2px;
  margin-inline: auto;
  background: var(--gx-ink);
  transition: transform var(--gx-dur-std) var(--gx-ease-enter);
}

.gx-burger[aria-expanded="true"] .gx-burger__bar { background: var(--gx-paper); }
.gx-burger[aria-expanded="true"] .gx-burger__bar:first-child { transform: translateY(0.19rem) rotate(45deg); }
.gx-burger[aria-expanded="true"] .gx-burger__bar:last-child  { transform: translateY(-0.19rem) rotate(-45deg); }

/* --- Full-screen overlay menu ------------------------------------------- */

.gx-overlay {
  position: fixed;
  inset: 0;
  z-index: 99;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--gx-space-xl);
  padding: 7rem var(--gx-gutter) var(--gx-space-xl);
  background: var(--gx-ink);
  color: var(--gx-paper);
  opacity: 0;
  transform: translate3d(0, -1.5rem, 0);
  transition:
    opacity   var(--gx-dur-std) var(--gx-ease-enter),
    transform var(--gx-dur-std) var(--gx-ease-enter);
}

.gx-overlay[hidden] { display: none; }
.gx-overlay.is-open { opacity: 1; transform: translate3d(0, 0, 0); }

.gx-overlay__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--gx-space-2xs);
}

.gx-overlay__list li {
  opacity: 0;
  transform: translate3d(0, var(--gx-reveal-y), 0);
  transition:
    opacity   var(--gx-dur-std) var(--gx-ease-enter),
    transform var(--gx-dur-std) var(--gx-ease-enter);
  transition-delay: calc(var(--gx-i, 0) * var(--gx-stagger));
}

.gx-overlay.is-open .gx-overlay__list li { opacity: 1; transform: translate3d(0, 0, 0); }

.gx-overlay__link {
  font-family: var(--gx-font-display);
  font-size: clamp(2.5rem, 12vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.05;
  text-transform: lowercase;
  text-decoration: none;
  color: var(--gx-paper);
}

.gx-overlay__link[aria-current="page"] { color: var(--gx-turmeric); }

.gx-overlay__foot {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--gx-space-s);
  opacity: 0;
  transform: translate3d(0, var(--gx-reveal-y), 0);
  transition:
    opacity   var(--gx-dur-std) var(--gx-ease-enter),
    transform var(--gx-dur-std) var(--gx-ease-enter);
  transition-delay: calc(var(--gx-i, 0) * var(--gx-stagger));
}

.gx-overlay.is-open .gx-overlay__foot { opacity: 1; transform: translate3d(0, 0, 0); }

.gx-overlay__email { color: var(--gx-paper); }

.gx-overlay .gx-btn { background: var(--gx-turmeric); color: var(--gx-ink); }
.gx-overlay .gx-btn:hover { background: var(--gx-paper); color: var(--gx-ink); }

/* Focus ring must stay visible against the dark overlay. */
.gx-overlay :focus-visible { outline-color: var(--gx-turmeric); }

/* --- Breakpoints -------------------------------------------------------- */

@media (min-width: 64rem) {
  .gx-nav          { display: block; }
  .gx-header__cta  { display: inline-flex; }
  .gx-burger       { display: none; }
  .gx-overlay      { display: none !important; }
}