.site-header {
  background: var(--color-bg-primary);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.header-content {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--spacing-md) 0;
  position: relative;
}

.logo-link {
  display: flex;
  align-items: center;
  margin-right: auto;
}

.logo {
  height: 50px;
  width: auto;
}

.main-nav {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.nav-list {
  display: flex;
  list-style: none;
  gap: var(--spacing-xl);
  align-items: center;
  justify-content: center;
}

.nav-link {
  color: var(--color-text-primary);
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

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

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
  margin-left: auto;
}

.mobile-menu-toggle span {
  width: 25px;
  height: 3px;
  background-color: var(--color-text-primary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
}

@media (max-width: 1200px) {
  .mobile-menu-toggle {
    display: flex;
  }
  
  .main-nav {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    transform: translateX(100%);
    background: var(--color-bg-primary);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xl);
    transition: transform var(--transition-base);
    z-index: var(--z-dropdown);
  }
  
  .main-nav.active {
    transform: translateX(0);
  }
  
  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
  }
  
  .nav-link {
    width: 100%;
    padding: var(--spacing-md);
  }
  
  .mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
  }
  
  .mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  
  .mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }
}