.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  background: color-mix(in srgb, var(--color-background) 80%, transparent);
  border-bottom: 1px solid rgba(148, 163, 184, 0.25);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
  gap: var(--space-4);
}

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

.site-header__logo-link {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--color-gray-900);
}

.site-header__logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 12px;
  background: radial-gradient(circle at 20% 20%, #dbeafe 0, #2563eb 50%, #1e40af 100%);
  box-shadow: 0 10px 25px rgba(37, 99, 235, 0.3);
}

.site-header__logo-text {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

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

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
}

.site-header__nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: 0.2rem 0;
}

.site-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.25rem;
  width: 0;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, #60a5fa, #2563eb);
  transition: width var(--transition-base);
}

.site-header__nav-link:hover,
.site-header__nav-link:focus-visible {
  color: var(--color-gray-900);
}

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

.site-header__nav-item--cta .site-header__nav-link--btn {
  padding: 0.35rem 0.95rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(37, 99, 235, 0.18);
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

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

.site-header__nav-item--cta .site-header__nav-link--btn:hover,
.site-header__nav-item--cta .site-header__nav-link--btn:focus-visible {
  background: linear-gradient(135deg, #1d4ed8, #1e40af);
  color: #ffffff;
}

.site-header__menu-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-gray-200);
  background-color: rgba(248, 250, 252, 0.85);
  color: var(--color-gray-800);
  font-size: var(--font-size-sm);
  cursor: pointer;
}

.site-header__menu-toggle-icon {
  position: relative;
  width: 18px;
  height: 14px;
}

.site-header__menu-toggle-icon::before,
.site-header__menu-toggle-icon::after,
.site-header__menu-toggle-icon span {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 999px;
  background-color: var(--color-gray-800);
  transition: transform var(--transition-base), opacity var(--transition-base), top var(--transition-base), bottom var(--transition-base);
}

.site-header__menu-toggle-icon::before {
  top: 0;
}

.site-header__menu-toggle-icon::after {
  bottom: 0;
}

.site-header__menu-toggle-icon span {
  top: 50%;
  transform: translateY(-50%);
}

.site-header__menu-toggle[aria-expanded="true"] .site-header__menu-toggle-icon::before {
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
}

.site-header__menu-toggle[aria-expanded="true"] .site-header__menu-toggle-icon::after {
  bottom: 50%;
  transform: translateY(50%) rotate(-45deg);
}

.site-header__menu-toggle[aria-expanded="true"] .site-header__menu-toggle-icon span {
  opacity: 0;
}

.site-header__menu-toggle-label {
  font-weight: 500;
}

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

  .site-header__menu-toggle {
    display: inline-flex;
  }

  .site-header__nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    background: rgba(248, 250, 252, 0.98);
    border-bottom: 1px solid var(--color-border-subtle);
    box-shadow: var(--shadow-md);
    transform-origin: top;
    transform: scaleY(1);
  }

  .site-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-3) var(--space-4) var(--space-4);
    gap: 0.25rem;
  }

  .site-header__nav-item--cta {
    margin-top: 0.5rem;
  }

  .site-header__nav-link {
    padding: 0.55rem 0.25rem;
  }

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

  .site-header__nav--hidden {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header__menu-toggle-icon::before,
  .site-header__menu-toggle-icon::after,
  .site-header__menu-toggle-icon span {
    transition: none;
  }
}