.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: rgb(15, 23, 42);
    backdrop-filter: blur(8px);
    z-index: 100;
    padding-top: 10px;
  }
  
  .header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
  }
  
  .logo {
    display: flex;
    align-items: center;
  }
  
  .logo-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 1.2rem;
    color: var(--light-text);
    transition: color var(--transition-speed) ease;
  }
  
  .logo-link:hover {
    color: var(--primary-light);
  }
  
  .logo-icon {
    font-size: 1.5rem;
  }
  
  .main-nav {
    flex: 1;
    display: flex;
    justify-content: center;
  }
  
  .nav-list {
    display: flex;
    align-items: center;
    gap: 2rem;
  }
  
  .nav-item {
    position: relative;
  }
  
  .nav-link {
    color: var(--light-text);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color var(--transition-speed) ease;
    display: flex;
    align-items: center;
    gap: 0.25rem;
  }
  
  .nav-link:hover, 
  .nav-link.active {
    color: var(--primary-light);
  }
  
  .dropdown-icon {
    font-size: 0.7rem;
    transition: transform var(--transition-speed) ease;
  }
  
  .dropdown {
    position: relative;
  }
  
  .dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--dark-surface);
    border-radius: 0.5rem;
    min-width: 180px;
    padding: 0.75rem 0;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-speed) ease;
    z-index: 10;
    margin-top: 0.5rem;
  }
  
  .dropdown.active .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  
  .dropdown.active .dropdown-icon {
    transform: rotate(180deg);
  }
  
  .dropdown-item {
    display: block;
    padding: 0.5rem 1.5rem;
    font-size: 0.9rem;
    color: var(--light-text);
    transition: all var(--transition-speed) ease;
  }
  
  .dropdown-item:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--primary-light);
  }
  
  .header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }
  
  .mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
  }
  
  .mobile-menu-btn span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--light-text);
    transition: all var(--transition-speed) ease;
  }
  
  /* Mobile menu styles */
  .mobile-menu-open .main-nav {
    transform: translateX(0);
    opacity: 1;
    visibility: visible;
  }
  
  .mobile-menu-open .mobile-menu-btn span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  
  .mobile-menu-open .mobile-menu-btn span:nth-child(2) {
    opacity: 0;
  }
  
  .mobile-menu-open .mobile-menu-btn span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }
  
  @media (max-width: 992px) {
    .nav-list {
      gap: 1.5rem;
    }
  }
  
  @media (max-width: 768px) {
    .main-nav {
      position: fixed;
      top: var(--header-height);
      left: 0;
      width: 100%;
      height: calc(100vh - var(--header-height));
      background-color: var(--dark-bg);
      transform: translateX(-100%);
      opacity: 0;
      visibility: hidden;
      transition: all 0.3s ease;
      z-index: 99;
    }
  
    .nav-list {
      flex-direction: column;
      align-items: flex-start;
      padding: 2rem;
      gap: 1.5rem;
    }
  
    .nav-item {
      width: 100%;
    }
  
    .nav-link {
      font-size: 1.1rem;
      width: 100%;
      display: flex;
      justify-content: space-between;
    }
  
    .dropdown-menu {
      position: static;
      background-color: transparent;
      box-shadow: none;
      padding: 0.5rem 0 0 1rem;
      opacity: 1;
      visibility: visible;
      transform: none;
      display: none;
      margin-top: 0.75rem;
    }
  
    .dropdown.active .dropdown-menu {
      display: block;
    }
  
    .dropdown-item {
      padding: 0.5rem 0;
    }
  
    .mobile-menu-btn {
      display: flex;
      z-index: 100;
    }
  
    .header-actions {
      gap: 0.5rem;
    }
  
    .header-actions .btn {
      display: none;
    }
  }