.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  z-index: var(--z-fixed);
  height: var(--header-height);
}

.header-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  height: 100%;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo-link {
  display: flex;
  align-items: center;
  height: 100%;
  margin-right: var(--spacing-xl);
}

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

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

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

.nav-link {
  color: var(--text-primary);
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast), color var(--transition-fast);
  text-align: center;
}

.nav-link:hover {
  background: rgba(99, 102, 241, 0.1);
  color: var(--color-primary-light);
}

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

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

.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(6px, -6px);
}

@media (max-width: 1200px) {
  .mobile-menu-toggle {
    display: flex;
  }
  
  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
    flex-direction: column;
    align-items: stretch;
    z-index: var(--z-dropdown);
  }
  
  .main-nav.active {
    max-height: 500px;
  }
  
  .nav-list {
    flex-direction: column;
    gap: 0;
    padding: var(--spacing-md);
    align-items: stretch;
  }
  
  .nav-link {
    display: block;
    padding: var(--spacing-md);
    width: 100%;
    text-align: center;
  }
}