.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  width: 100%;
  background: linear-gradient(to bottom, rgba(5, 6, 10, 0.98), rgba(5, 6, 10, 0.9), transparent);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: var(--header-height-desktop);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  pointer-events: none;
  z-index: 0;
}

.site-header-inner {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height-desktop);
}

.site-header-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-md);
  color: var(--color-text);
  flex-shrink: 0;
}

.site-header-brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 14px;
  background: radial-gradient(circle at 0 0, rgba(0, 245, 255, 0.6), transparent 55%), radial-gradient(circle at 100% 100%, rgba(245, 196, 81, 0.7), transparent 55%), #05060a;
  box-shadow: 0 0 0 1px rgba(245, 196, 81, 0.4), 0 12px 30px rgba(0, 0, 0, 0.9);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-inverse);
}

.site-header-brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.site-header-brand-title {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text);
}

.site-header-brand-subtitle {
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.site-header-nav {
  display: flex;
  align-items: center;
  margin-left: auto;
}

.site-header-nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.site-header-nav-item {
  display: flex;
}

.site-header-nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-soft);
  padding: 0.25rem 0;
}

.site-header-nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.2rem;
  width: 0;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  box-shadow: 0 0 12px rgba(0, 245, 255, 0.7);
  transition: width var(--transition-base);
}

.site-header-nav-link:hover {
  color: var(--color-text);
}

.site-header-nav-link:hover::after {
  width: 100%;
}

.site-header-nav-link.is-active {
  color: var(--color-primary-strong);
}

.site-header-nav-link.is-active::after {
  width: 100%;
}

.site-header-nav-item-cta {
  align-items: center;
}

.site-header-nav-item-cta .site-header-nav-link-cta {
  padding: 0.45rem 1.3rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(245, 196, 81, 0.7);
  background: radial-gradient(circle at top left, rgba(245, 196, 81, 0.4), transparent 55%), radial-gradient(circle at bottom right, rgba(0, 245, 255, 0.3), transparent 55%), #11141f;
  box-shadow: 0 0 0 1px rgba(245, 196, 81, 0.4), 0 14px 35px rgba(0, 0, 0, 0.9);
  color: var(--color-text);
}

.site-header-nav-item-cta .site-header-nav-link-cta::after {
  display: none;
}

.site-header-nav-item-cta .site-header-nav-link-cta:hover {
  color: var(--color-primary-strong);
  border-color: var(--color-primary-strong);
}

.site-header-toggle {
  display: none;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(5, 6, 10, 0.96);
  border-radius: var(--radius-pill);
  width: 2.5rem;
  height: 2.5rem;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 0;
  cursor: pointer;
  color: var(--color-text);
}

.site-header-toggle:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.site-header-toggle-bar {
  position: relative;
  width: 16px;
  height: 2px;
  border-radius: 999px;
  background: var(--color-text);
  transition: transform var(--transition-base), opacity var(--transition-base), background var(--transition-base);
}

.site-header-toggle[aria-expanded="true"] .site-header-toggle-bar:nth-child(1) {
  transform: translateY(3px) rotate(45deg);
}

.site-header-toggle[aria-expanded="true"] .site-header-toggle-bar:nth-child(2) {
  transform: translateY(-3px) rotate(-45deg);
}

@media (max-width: 991.98px) {
  .site-header::before {
    height: var(--header-height-tablet);
  }

  .site-header-inner {
    height: var(--header-height-tablet);
  }
}

@media (max-width: 767.98px) {
  .site-header::before {
    height: var(--header-height-mobile);
  }

  .site-header-inner {
    height: var(--header-height-mobile);
  }

  .site-header-toggle {
    display: inline-flex;
    flex-shrink: 0;
  }

  .site-header-nav {
    margin-left: 0;
    position: fixed;
    top: var(--header-height-mobile);
    right: 0;
    bottom: 0;
    left: 0;
    z-index: var(--z-overlay);
    background: radial-gradient(circle at top, rgba(0, 245, 255, 0.22), transparent 60%), #05060a;
    display: flex;
    align-items: flex-start;
    justify-content: flex-start;
    padding: var(--space-2xl) var(--space-xl) var(--space-3xl);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    overflow-y: auto;
    transition: transform var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
  }

  .site-header-nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-lg);
    width: 100%;
  }

  .site-header-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .site-header-nav-link {
    font-size: var(--text-md);
  }

  .site-header-nav-item-cta .site-header-nav-link-cta {
    width: 100%;
    justify-content: center;
  }

  .site-header-brand-title {
    font-size: var(--text-xs);
  }

  .site-header-brand-subtitle {
    display: none;
  }
}

@media (max-width: 479.98px) {
  .site-header-brand-mark {
    width: 34px;
    height: 34px;
    font-size: 0.7rem;
  }

  .site-header-nav {
    padding-left: var(--space-md);
    padding-right: var(--space-md);
  }
}