.pfx-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  background: radial-gradient(circle at top left, rgba(0, 180, 255, 0.16), transparent 55%),
              linear-gradient(to bottom, rgba(5, 8, 16, 0.96), rgba(5, 8, 16, 0.90));
  border-bottom: 1px solid rgba(148, 163, 184, 0.35);
}

.pfx-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-16);
  padding-bottom: var(--space-16);
  gap: var(--space-16);
}

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

.pfx-header__logo-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-12);
  color: inherit;
}

.pfx-header__logo-mark {
  width: 40px;
  height: 40px;
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at 20% 0, rgba(0, 180, 255, 0.8), transparent 55%),
              linear-gradient(135deg, #020617, #0f172a);
  box-shadow: 0 12px 30px rgba(0, 180, 255, 0.45);
}

.pfx-header__logo-icon {
  color: #e5f4ff;
  font-size: 1.05rem;
}

.pfx-header__text-group {
  display: flex;
  flex-direction: column;
}

.pfx-header__title {
  font-family: "Space Grotesk", var(--font-sans);
  font-weight: 600;
  letter-spacing: 0.03em;
  font-size: var(--text-lg);
}

.pfx-header__subtitle {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.pfx-header__nav {
  margin-left: auto;
}

.pfx-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-16);
  list-style: none;
  margin: 0;
  padding: 0;
}

.pfx-header__nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  font-size: var(--text-sm);
  color: var(--gray-100);
  padding: 0.35rem 0.25rem;
}

.pfx-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.25rem;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, #00b4ff, #00e0ff);
  opacity: 0;
  transform-origin: center;
  transform: scaleX(0.4);
  transition: opacity var(--transition-normal), transform var(--transition-normal);
}

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

.pfx-header__nav-link--cta {
  padding-inline: 0.9rem;
  padding-block: 0.35rem;
  border-radius: var(--radius-pill);
  background: linear-gradient(135deg, #00b4ff, #00e0ff);
  color: #020617;
  box-shadow: 0 10px 30px rgba(0, 180, 255, 0.35);
}

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

.pfx-header__nav-link--cta:hover {
  transform: translateY(-1px);
}

.pfx-header__nav-item--cta {
  margin-left: var(--space-8);
}

.pfx-header__toggle {
  display: none;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.7rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(148, 163, 184, 0.55);
  background: rgba(15, 23, 42, 0.95);
  color: var(--gray-100);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  cursor: pointer;
}

.pfx-header__toggle-box {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
}

.pfx-header__toggle-bar {
  width: 16px;
  height: 2px;
  border-radius: 999px;
  background: #e5f4ff;
  transition: transform var(--transition-fast), opacity var(--transition-fast), translate var(--transition-fast);
}

.pfx-header__toggle-text {
  font-weight: 500;
}

.pfx-header__toggle:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

.pfx-header__toggle[aria-expanded="true"] .pfx-header__toggle-bar:nth-child(1) {
  transform: rotate(42deg) translate(2px, 4px);
}

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

.pfx-header__toggle[aria-expanded="true"] .pfx-header__toggle-bar:nth-child(3) {
  transform: rotate(-42deg) translate(3px, -5px);
}

@media (max-width: 768px) {
  .pfx-header__inner {
    padding-top: var(--space-12);
    padding-bottom: var(--space-12);
  }

  .pfx-header__subtitle {
    display: none;
  }

  .pfx-header__toggle {
    display: inline-flex;
  }

  .pfx-header__nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    padding-inline: var(--space-16);
    padding-bottom: var(--space-16);
  }

  .pfx-header__nav-list {
    margin-top: var(--space-12);
    flex-direction: column;
    align-items: stretch;
    border-radius: var(--radius-lg);
    padding: var(--space-16);
    background: radial-gradient(circle at top, rgba(0, 180, 255, 0.24), transparent 70%),
                linear-gradient(135deg, rgba(15, 23, 42, 0.98), rgba(15, 23, 42, 0.98));
    border: 1px solid rgba(148, 163, 184, 0.45);
    box-shadow: var(--shadow-hard);
    max-height: 0;
    opacity: 0;
    transform: translateY(-4px);
    pointer-events: none;
    transition: max-height var(--transition-slow), opacity var(--transition-normal), transform var(--transition-normal);
  }

  .pfx-header__nav-item {
    width: 100%;
  }

  .pfx-header__nav-link,
  .pfx-header__nav-link--cta {
    width: 100%;
    justify-content: space-between;
    padding-block: 0.55rem;
  }

  .pfx-header__nav-link::after {
    display: none;
  }

  .pfx-header--menu-open .pfx-header__nav-list {
    max-height: 520px;
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }
}

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