.gch-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  background: linear-gradient(to bottom, rgba(10, 10, 12, 0.96), rgba(10, 10, 12, 0.9));
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.gch-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
}

.gch-header__brand {
  display: flex;
  align-items: center;
}

.gch-header__logo-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.gch-header__logo-mark {
  width: 40px;
  height: 40px;
  border-radius: 14px;
  background: radial-gradient(circle at 20% 0%, #ffffff, transparent 55%), radial-gradient(circle at 80% 100%, rgba(217, 164, 65, 0.85), transparent 55%), #12161e;
  box-shadow: 0 0 0 1px rgba(217, 164, 65, 0.65), 0 14px 30px rgba(0, 0, 0, 0.7);
  position: relative;
}

.gch-header__logo-mark::before,
.gch-header__logo-mark::after {
  content: "";
  position: absolute;
  border-radius: 999px;
}

.gch-header__logo-mark::before {
  inset: 9px;
  border: 2px solid rgba(217, 164, 65, 0.85);
}

.gch-header__logo-mark::after {
  inset: 16px;
  border: 2px solid rgba(255, 255, 255, 0.8);
}

.gch-header__title {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.gch-header__subtitle {
  display: block;
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.gch-header__nav {
  margin-left: var(--space-6);
}

.gch-header__menu {
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin: 0;
  padding: 0;
}

.gch-header__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding: 0.35rem 0.1rem;
}

.gch-header__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #f7e0a3, #d9a441);
  transition: width var(--transition-base);
}

.gch-header__link:hover,
.gch-header__link:focus-visible {
  color: var(--color-text);
}

.gch-header__link:hover::after,
.gch-header__link:focus-visible::after {
  width: 100%;
}

.gch-header__item--cta .gch-header__link {
  padding: 0.5rem 1.2rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(217, 164, 65, 0.85);
  background: radial-gradient(circle at 0 0, rgba(255, 255, 255, 0.14), transparent 55%), #d9a441;
  color: #1a1712;
  box-shadow: var(--shadow-soft);
}

.gch-header__item--cta .gch-header__link::after {
  display: none;
}

.gch-header__item--cta .gch-header__link:hover,
.gch-header__item--cta .gch-header__link:focus-visible {
  background: #f0c96a;
  color: #1a1712;
}

.gch-header__toggle {
  display: none;
  position: relative;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 999px;
  border: 1px solid rgba(217, 164, 65, 0.6);
  background: rgba(10, 10, 12, 0.95);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
}

.gch-header__toggle-bar {
  width: 1.35rem;
  height: 2px;
  border-radius: 999px;
  background: #f5f3ef;
  transition: transform var(--transition-base), opacity var(--transition-fast), width var(--transition-fast);
}

.gch-header__toggle[aria-expanded="true"] .gch-header__toggle-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.gch-header__toggle[aria-expanded="true"] .gch-header__toggle-bar:nth-child(2) {
  opacity: 0;
}

.gch-header__toggle[aria-expanded="true"] .gch-header__toggle-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

@media (max-width: 920px) {
  .gch-header__toggle {
    display: inline-flex;
  }
  .gch-header__nav {
    position: absolute;
    inset: calc(100% - 1px) var(--space-4) auto var(--space-4);
    border-radius: var(--radius-lg);
    background: radial-gradient(circle at top left, rgba(217, 164, 65, 0.18), transparent 55%), rgba(15, 17, 21, 0.98);
    box-shadow: var(--shadow-subtle);
    transform-origin: top right;
    transform: scale(0.98) translateY(-6px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base), transform var(--transition-base);
  }
  .gch-header__menu {
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-4);
    gap: var(--space-2);
  }
  .gch-header__link {
    padding: 0.6rem 0.4rem;
  }
  .gch-header__nav.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: scale(1) translateY(0);
  }
}

@media (max-width: 600px) {
  .gch-header__subtitle {
    display: none;
  }
  .gch-header__title {
    font-size: 1.1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .gch-header__nav,
  .gch-header__toggle-bar {
    transition: none;
  }
}

.gch-header__toggle:focus-visible,
.gch-header__link:focus-visible {
  box-shadow: var(--shadow-focus);
  border-radius: var(--radius-pill);
  outline: none;
}