.shell-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  backdrop-filter: blur(18px);
  background: linear-gradient(to bottom, rgba(9, 9, 12, 0.96), rgba(9, 9, 12, 0.88));
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.shell-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-4);
}

.shell-header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.shell-header__logo-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-4);
}

.shell-header__logo-mark {
  width: 38px;
  height: 38px;
  border-radius: 999px;
  border: 1px solid rgba(212, 180, 106, 0.55);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 1.25rem;
  background: radial-gradient(circle at 30% 0, rgba(212, 180, 106, 0.3), transparent 55%),
              linear-gradient(145deg, #15151b, #111116);
  color: var(--gray-50);
  box-shadow: var(--shadow-subtle);
}

.shell-header__logo-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.shell-header__logo-main {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gray-50);
}

.shell-header__logo-sub {
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.shell-header__nav {
  display: flex;
}

.shell-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-7);
}

.shell-header__nav-link {
  position: relative;
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gray-100);
  padding-block: var(--space-3);
}

.shell-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 1px;
  transform: scaleX(0);
  transform-origin: center;
  background: linear-gradient(90deg, transparent, var(--color-accent-gold), transparent);
  transition: transform var(--transition-base);
}

.shell-header__nav-link:hover::after,
.shell-header__nav-link:focus-visible::after {
  transform: scaleX(1);
}

.shell-header__nav-item--cta .shell-header__nav-link--cta {
  padding-inline: 1.4rem;
  padding-block: 0.65rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(212, 180, 106, 0.6);
  background: radial-gradient(circle at top left, rgba(212, 180, 106, 0.18), transparent 60%),
              linear-gradient(140deg, rgba(31, 90, 74, 0.9), rgba(18, 28, 25, 0.98));
  box-shadow: var(--shadow-subtle);
}

.shell-header__nav-item--cta .shell-header__nav-link--cta::after {
  display: none;
}

.shell-header__nav-item--cta .shell-header__nav-link--cta:hover {
  background: linear-gradient(140deg, var(--color-primary-hover), #0b1512);
  border-color: var(--color-accent-gold);
}

.shell-header__toggle {
  display: none;
  align-items: center;
  gap: var(--space-3);
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(10, 10, 14, 0.85);
  color: var(--gray-100);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.shell-header__toggle-icon {
  position: relative;
  width: 18px;
  height: 12px;
  display: inline-flex;
  flex-direction: column;
  justify-content: space-between;
}

.shell-header__toggle-icon span {
  display: block;
  height: 1px;
  width: 100%;
  background-color: var(--gray-100);
  transition: transform var(--transition-base), opacity var(--transition-base), top var(--transition-base), bottom var(--transition-base);
}

.shell-header__toggle[aria-expanded="true"] .shell-header__toggle-icon span:first-child {
  transform: translateY(5.5px) rotate(45deg);
}

.shell-header__toggle[aria-expanded="true"] .shell-header__toggle-icon span:last-child {
  transform: translateY(-5.5px) rotate(-45deg);
}

@media (max-width: 880px) {
  .shell-header__toggle {
    display: inline-flex;
  }

  .shell-header__nav {
    position: fixed;
    inset-inline: 0;
    top: 56px;
    background: radial-gradient(circle at top, rgba(200, 164, 90, 0.05), transparent 65%),
                rgba(6, 7, 10, 0.98);
    transform: translateY(-110%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition-slow), opacity var(--transition-slow), visibility var(--transition-slow);
  }

  .shell-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-8) var(--space-8) var(--space-10);
    gap: var(--space-5);
  }

  .shell-header__nav-link {
    font-size: 0.85rem;
  }

  .shell-header__nav--open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
}

@media (max-width: 540px) {
  .shell-header__logo-sub {
    display: none;
  }
}