.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
}

.site-header .nav {
  background: linear-gradient(90deg, rgba(245, 247, 250, 0.96), rgba(245, 247, 250, 0.98));
}

.nav-logo {
  display: inline-flex;
  align-items: center;
}

.nav-title-link {
  text-decoration: none;
}

.nav-toggle {
  display: none;
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: 999px;
  border: 1px solid rgba(203, 216, 230, 0.9);
  background: rgba(255, 255, 255, 0.9);
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal), transform var(--transition-fast);
}

.nav-toggle-bar {
  position: relative;
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: var(--gray-700);
  display: block;
  transition: transform var(--transition-normal), opacity var(--transition-normal), background-color var(--transition-normal);
}

.nav-toggle-bar + .nav-toggle-bar {
  margin-top: 4px;
}

.nav-toggle:hover {
  background: #fff;
  border-color: var(--color-accent);
  box-shadow: var(--shadow-soft);
  transform: translateY(-1px);
}

.nav-toggle.is-open .nav-toggle-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle.is-open .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-open .nav-toggle-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.nav-primary {
  display: flex;
  align-items: center;
}

.nav-links {
  list-style: none;
}

.nav-item {
  position: relative;
}

.nav-link {
  position: relative;
  padding-inline: 0.25rem;
}

.nav-link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

@media (max-width: 768px) {
  .nav-toggle {
    display: inline-flex;
    flex-direction: column;
  }

  .nav-primary {
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(245, 247, 250, 0.98);
    border-bottom: 1px solid rgba(203, 216, 230, 0.85);
    box-shadow: 0 12px 30px rgba(15, 23, 42, 0.18);
    transform-origin: top;
    transform: scaleY(0.9);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition-normal), transform var(--transition-normal), visibility var(--transition-normal);
  }

  .nav-primary.is-open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: scaleY(1);
  }

  .nav-links {
    display: flex;
    flex-direction: column;
    padding: 0.75rem 1.25rem 1rem;
    gap: 0.25rem;
  }

  .nav-item {
    width: 100%;
  }

  .nav-link {
    display: block;
    padding-block: 0.35rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .nav-primary,
  .nav-toggle,
  .nav-toggle-bar {
    transition: none !important;
  }
}