body {
      background-color: #121212;
      color: #e0e0e0;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    a {
      color: #5ecfff;
      text-decoration: none;
    }
    a:hover {
      color: #93e3ff;
      text-decoration: underline;
    }
    .sidebar {
      position: fixed;
      top: 0;
      left: 0;
      height: 100%;
      width: 250px;
      background-color: #1f1f1f;
      border-right: 2px solid #1f8fbf;
      transition: transform 0.3s ease;
      transform: translateX(0);
      z-index: 1000;
    }
    .sidebar.hidden {
      transform: translateX(-250px);
    }
    .nav-link {
      color: #e0e0e0;
      transition: color 0.3s, background-color 0.3s;
      cursor: pointer;
    }
    .nav-link:hover {
      color: #5ecfff;
      background-color: rgba(94, 207, 255, 0.1);
    }
    .nav-link.active {
      color: #5ecfff !important;
      font-weight: 600;
    }
    .dropdown-container {
      display: none;
      flex-direction: column;
      padding-left: 1rem;
      border-left: 2px solid rgba(94, 207, 255, 0.3);
      margin-top: 0.25rem;
      margin-bottom: 0.5rem;
    }
    .dropdown-container.show {
      display: flex;
    }
    .dropdown-item {
      color: #bcbcbc;
      text-decoration: none;
      padding: 0.25rem 0;
      transition: color 0.3s;
    }
    .dropdown-item:hover {
      color: #5ecfff;
    }
    .dropdown-toggle::after {
      content: "▸";
      float: right;
      transition: transform 0.3s;
    }
    .dropdown-toggle.open::after {
      transform: rotate(90deg);
    }
    .content {
      margin-left: 250px;
      transition: margin-left 0.3s ease;
      padding: 2rem;
    }
    .content.expanded {
      margin-left: 0;
    }
    .toggle-btn {
      position: fixed;
      top: 1rem;
      right: 1rem;
      z-index: 1100;
      background-color: #1f1f1f;
      color: #5ecfff;
      border: 1px solid #1f8fbf;
      padding: 0.5rem 1rem;
      border-radius: 5px;
      cursor: pointer;
      transition: background-color 0.3s, color 0.3s;
    }
    .toggle-btn:hover {
      background-color: #5ecfff;
      color: #121212;
    }
    @media (max-width: 768px) {
      .sidebar {
        transform: translateX(-250px);
      }
      .sidebar.active {
        transform: translateX(0);
      }
      .content {
        margin-left: 0;
      }
    }

    /* Active highlight for nav links and dropdown items */
    .nav-link.active, .dropdown-item.active {
      background-color: rgba(94, 207, 255, 0.15);
      color: #5ecfff !important;
      font-weight: 600;
      border-left: 4px solid #1f8fbf;
    }
    .dropdown-toggle.open {
      color: #5ecfff !important;
      font-weight: 600;
    }
    .dropdown-container.show {
      display: flex;
      flex-direction: column;
    }

    .fade-in {
      opacity: 0;
      animation: fadeIn 2s forwards;
    }

    @keyframes fadeIn {
      to {
        opacity: 1;
      }
    }