header {
  background: var(--bg-primary);
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-family: var(--font-heading);
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  margin-right: var(--spacing-xl);
}

.logo img {
  height: 40px;
  width: auto;
}

.nav {
  display: flex;
  justify-content: center;
  align-items: center;
  flex: 1;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: var(--spacing-xl);
  margin: 0;
  padding: 0;
}

.nav-link {
  color: var(--text-primary);
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-md);
  transition: color var(--transition-fast);
  text-decoration: none;
  text-align: center;
}

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

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: var(--font-size-2xl);
  color: var(--text-primary);
  cursor: pointer;
  padding: var(--spacing-sm);
}

.mobile-nav {
  display: none;
  position: fixed;
  top: 70px;
  left: 0;
  right: 0;
  background: var(--bg-primary);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-dropdown);
  max-height: calc(100vh - 70px);
  overflow-y: auto;
}

.mobile-nav.active {
  display: block;
}

.mobile-nav-list {
  list-style: none;
  padding: var(--spacing-md);
}

.mobile-nav-link {
  display: block;
  padding: var(--spacing-md);
  color: var(--text-primary);
  text-decoration: none;
  border-bottom: 1px solid var(--bg-secondary);
}

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

@media (max-width: 1200px) {
  .nav {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
}

@media (max-width: 767px) {
  .header-container {
    padding: var(--spacing-sm) var(--spacing-md);
  }
}