body {
      height: 100vh;
      margin: 0;
      overflow: hidden;
    }

    .sidebar {
      position: fixed;
      top: 56px;
      left: 0;
      width: 250px;
      height: calc(100vh - 56px);
      background-color: #f8f9fa;
      padding-top: 1rem;
      overflow-y: auto;
      border-right: 1px solid #dee2e6;
      transition: transform 0.3s ease;
      z-index: 1030;
    }

    .sidebar.hidden {
      transform: translateX(-100%);
    }

    .main {
      margin-top: 56px;
      margin-left: 250px;
      padding: 2rem;
      height: calc(100vh - 56px);
      overflow-y: auto;
      transition: margin-left 0.3s ease;
    }

    .main.full-width {
      margin-left: 0;
    }

    .submenu {
      display: none;
      padding-left: 1.5rem;
    }

    .submenu.show {
      display: block;
    }

    .sidebar .nav-link {
      color: #333;
      font-weight: 500;
      cursor: pointer;
    }

    .submenu a {
      font-size: 0.95rem;
      display: block;
      padding: 0.25rem 0.5rem;
      color: #555;
      border-radius: 0.25rem;
    }

    .submenu a:hover {
      background-color: #e2e6ea;
      color: #000;
    }

    @media (max-width: 768px) {
      .main {
        margin-left: 0 !important;
      }
    }