.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  background: linear-gradient(to bottom, rgba(5, 8, 22, 0.92), rgba(5, 8, 22, 0.78));
  border-bottom: 1px solid rgba(148, 163, 184, 0.35);
}

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

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

.site-header__logo {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--color-text);
}

.site-header__logo-mark {
  width: 2.1rem;
  height: 2.1rem;
  border-radius: 30%;
  background: radial-gradient(circle at 30% 20%, #f97316, transparent 55%),
              radial-gradient(circle at 70% 80%, #22c55e, transparent 55%),
              radial-gradient(circle at 50% 50%, #38bdf8, transparent 65%);
  box-shadow: var(--shadow-neon);
}

.site-header__logo-text {
  font-family: var(--font-display);
  font-size: 0.95rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.site-header__nav {
  display: flex;
  align-items: center;
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  list-style: none;
}

.site-header__nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: var(--font-size-sm);
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.site-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.3rem;
  width: 0;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--color-primary), #38bdf8);
  transition: width var(--transition-normal);
}

.site-header__nav-link:hover,
.site-header__nav-link:focus-visible {
  color: var(--color-text);
}

.site-header__nav-link:hover::after,
.site-header__nav-link:focus-visible::after {
  width: 100%;
}

.site-header__nav-item--cta .site-header__nav-link--cta {
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(148, 163, 184, 0.6);
  background: radial-gradient(circle at 0 0, var(--color-primary-soft), transparent 60%);
  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,
.site-header__nav-item--cta .site-header__nav-link--cta:focus-visible {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-neon);
}

.site-header__nav-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.9);
}

.site-header__toggle {
  position: relative;
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 0.25rem;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.7);
  background: radial-gradient(circle at 0 0, rgba(56, 189, 248, 0.25), transparent 65%);
  color: var(--color-text);
}

.site-header__toggle-bar {
  width: 1.3rem;
  height: 2px;
  border-radius: 999px;
  background: var(--color-text);
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.site-header__toggle:focus-visible {
  outline: 2px solid #38bdf8;
  outline-offset: 3px;
}

.site-header__toggle.is-active .site-header__toggle-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.site-header__toggle.is-active .site-header__toggle-bar:nth-child(2) {
  opacity: 0;
}

.site-header__toggle.is-active .site-header__toggle-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

@media (max-width: 768px) {
  .site-header__inner {
    padding-top: var(--space-2);
    padding-bottom: var(--space-2);
  }

  .site-header__nav {
    position: fixed;
    inset: 0;
    inset-block-start: 3.5rem;
    display: none;
    justify-content: flex-start;
    align-items: flex-start;
    background: radial-gradient(circle at top, rgba(15, 23, 42, 0.98), rgba(5, 8, 22, 0.98));
    border-top: 1px solid rgba(148, 163, 184, 0.35);
    padding: var(--space-4);
  }

  .site-header__nav--open {
    display: flex;
  }

  .site-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    background: rgba(15, 23, 42, 0.95);
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(148, 163, 184, 0.3);
  }

  .site-header__nav-link {
    font-size: var(--font-size-base);
  }

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

@media (min-width: 769px) {
  .site-header__toggle {
    display: none;
  }
}

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