.navbar {
    background-color: var(--card-bg-color);
    box-shadow: var(--box-shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: var(--transition);
  }
  
  .navbar-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
  }
  
  .navbar-brand {
    display: flex;
    align-items: center;
  }
  
  .navbar-brand a {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--heading-color);
  }
  
  .logo {
    height: 32px;
  }
  
  .navbar-menu {
    display: flex;
    align-items: center;
  }
  
  .navbar-menu ul {
    display: flex;
    list-style: none;
    margin-right: 20px;
  }
  
  .navbar-menu li {
    margin: 0 10px;
  }
  
  .navbar-menu a {
    color: var(--text-color);
    font-weight: 500;
    padding: 8px 12px;
    border-radius: 4px;
  }
  
  .navbar-menu a:hover,
  .navbar-menu a.active {
    color: var(--primary-color);
    background-color: rgba(73, 144, 226, 0.1);
  }
  
  .theme-toggle {
    background: transparent;
    border: none;
    font-size: 1.2rem;
    color: var(--text-color);
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: var(--transition);
  }
  
  .theme-toggle:hover {
    background-color: rgba(0, 0, 0, 0.1);
  }
  
  #mobile-menu-toggle {
    display: none;
    background: transparent;
    border: none;
    font-size: 1.5rem;
    color: var(--heading-color);
    cursor: pointer;
  }
  
  /* Responsive styles */
  @media (max-width: 768px) {
    .navbar-menu {
      position: fixed;
      top: 70px;
      left: 0;
      right: 0;
      background-color: var(--card-bg-color);
      box-shadow: var(--box-shadow);
      flex-direction: column;
      align-items: flex-start;
      padding: 15px;
      transform: translateY(-100%);
      opacity: 0;
      visibility: hidden;
      transition: 0.3s ease;
    }
    
    .navbar-menu.active {
      transform: translateY(0);
      opacity: 1;
      visibility: visible;
    }
    
    .navbar-menu ul {
      flex-direction: column;
      width: 100%;
      margin-right: 0;
      margin-bottom: 15px;
    }
    
    .navbar-menu li {
      margin: 5px 0;
      width: 100%;
    }
    
    .navbar-menu a {
      display: block;
      padding: 12px;
      width: 100%;
    }
    
    #mobile-menu-toggle {
      display: block;
    }
    
    .theme-toggle {
      margin-left: 12px;
    }
  }