.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(14px);
  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: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text);
}

.site-header__logo-mark {
  width: 40px;
  height: 40px;
  border-radius: 999px;
  background: radial-gradient(circle at 30% 20%, #60a5fa, #1d4ed8);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
}

.site-header__logo-icon {
  color: #ffffff;
  font-size: 1rem;
}

.site-header__brand-text {
  display: flex;
  flex-direction: column;
}

.site-header__brand-name {
  font-weight: 600;
  font-size: var(--font-size-lg);
  letter-spacing: -0.02em;
}

.site-header__brand-tagline {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

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

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-header__nav-link {
  position: relative;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--gray-700);
  padding: 0.25rem 0;
}

.site-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.2rem;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-strong));
  border-radius: 999px;
  transition: width var(--transition-base);
}

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

.site-header__nav-cta {
  margin-left: var(--space-2);
}

.site-header__cta-button {
  font-size: var(--font-size-sm);
  padding-inline: 1.25rem;
  padding-block: 0.5rem;
}

.site-header__nav-toggle {
  display: none;
  position: relative;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 999px;
  border: 1px solid var(--gray-200);
  align-items: center;
  justify-content: center;
  cursor: pointer;
  background-color: #ffffff;
  color: var(--color-text);
}

.site-header__nav-toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

.site-header__nav-toggle-bar {
  position: absolute;
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background-color: var(--gray-700);
  transition: transform var(--transition-base), opacity var(--transition-fast), top var(--transition-base), bottom var(--transition-base);
}

.site-header__nav-toggle-bar:nth-child(1) {
  top: 0.9rem;
}

.site-header__nav-toggle-bar:nth-child(2) {
  top: 50%;
  transform: translateY(-50%);
}

.site-header__nav-toggle-bar:nth-child(3) {
  bottom: 0.9rem;
}

.site-header__nav-toggle[aria-expanded="true"] .site-header__nav-toggle-bar:nth-child(1) {
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
}

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

.site-header__nav-toggle[aria-expanded="true"] .site-header__nav-toggle-bar:nth-child(3) {
  bottom: auto;
  top: 50%;
  transform: translateY(-50%) rotate(-45deg);
}

@media (max-width: 900px) {
  .site-header__nav-toggle {
    display: inline-flex;
  }

  .site-header__nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    background-color: rgba(15, 23, 42, 0.75);
    backdrop-filter: blur(18px);
    transform-origin: top;
  }

  .site-header__nav-list {
    display: none;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: var(--space-2) var(--space-4) var(--space-4);
  }

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

  .site-header__nav-link,
  .site-header__cta-button {
    display: block;
    width: 100%;
    padding-block: 0.75rem;
  }

  .site-header__nav-link {
    color: #e5e7eb;
  }

  .site-header__nav-link::after {
    background: rgba(191, 219, 254, 0.8);
  }

  .site-header__nav-cta {
    margin-left: 0;
    margin-top: var(--space-2);
  }

  .site-header__cta-button {
    text-align: center;
  }

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

@media (max-width: 640px) {
  .site-header__brand-tagline {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header__nav-toggle-bar,
  .site-header__nav-link::after {
    transition: none;
  }
}