.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  background-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  transition: all var(--transition-base);
}

.nav.scrolled {
  box-shadow: var(--shadow-sm);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-2xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 44px;
}

.nav-logo a {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  transition: color var(--transition-fast);
}

.nav-logo a:hover {
  color: var(--color-primary);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.nav-link {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-normal);
  color: var(--color-text-primary);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-base);
}

.nav-link:hover {
  color: var(--color-primary);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 5px;
}

.nav-toggle .bar {
  width: 25px;
  height: 2px;
  background-color: var(--color-text-primary);
  transition: all var(--transition-base);
  border-radius: 2px;
}

@media (max-width: 768px) {
  .nav-container {
    height: 48px;
    padding: 0 var(--spacing-lg);
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .nav-menu {
    position: fixed;
    left: -100%;
    top: 48px;
    flex-direction: column;
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    width: 100%;
    text-align: center;
    transition: left var(--transition-base);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xl) 0;
    gap: var(--spacing-md);
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .nav-link {
    font-size: var(--font-size-lg);
    width: 100%;
    padding: var(--spacing-md);
  }
  
  .nav-link::after {
    display: none;
  }
  
  .nav-toggle.active .bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  
  .nav-toggle.active .bar:nth-child(2) {
    opacity: 0;
  }
  
  .nav-toggle.active .bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
}