body {
      margin: 0;
      font-family: 'Segoe UI', sans-serif;
      background-color: #f0f4f8;
      transition: background-color 0.3s ease;
    }

    header {
      background-color: #002b5c;
      color: white;
      padding: 1rem 2rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .dark-mode {
      background-color: #121212;
      color: white;
    }

    .container {
      display: flex;
      min-height: 100vh;
    }

    nav {
      width: 220px;
      background-color: #003366;
      color: white;
      padding: 20px;
    }

    nav a {
      display: block;
      color: white;
      text-decoration: none;
      margin-bottom: 12px;
      font-weight: bold;
    }

    main {
      flex: 1;
      padding: 30px;
    }

    .card {
      background: white;
      padding: 20px;
      margin-bottom: 20px;
      border-radius: 10px;
      box-shadow: 0 0 10px rgba(0,0,0,0.1);
    }

    .status {
      padding: 5px 10px;
      color: white;
      border-radius: 5px;
      font-size: 0.8rem;
    }

    .green { background-color: #28a745; }
    .orange { background-color: #fd7e14; }
    .red { background-color: #dc3545; }

    .search-bar {
      margin-bottom: 15px;
      display: flex;
      gap: 10px;
    }

    input[type="text"] {
      padding: 8px;
      width: 50%;
    }

    select {
      padding: 8px;
    }

    .notification {
      background-color: #fff8e1;
      padding: 10px;
      margin-top: 10px;
      border-left: 5px solid #ffa000;
    }

    .dark-mode .card {
      background-color: #1e1e1e;
      color: #f0f0f0;
    }

    .dark-mode nav, .dark-mode header {
      background-color: #1b1b1b;
    }

    .toggle-btn {
      background-color: #ffffff;
      color: #002b5c;
      padding: 6px 12px;
      border-radius: 6px;
      cursor: pointer;
      border: none;
    }

    .dark-mode .toggle-btn {
      background-color: #333;
      color: #ffffff;
    }
    .status.on-time {
      background-color: #28a745;
    }
    .status.delayed {
      background-color: #dc3545;
    }
    .status.cancelled {
      background-color: #dc3545;
    }               
    .status.scheduled {
      background-color: #17a2b8;
    }
    .status.completed {
      background-color: #28a745;
    }