body {
      background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
      min-height: 100vh;
      padding: 20px 0;
    }
    .task-card {
      background: white;
      border-radius: 10px;
      box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
      max-width: 600px;
      margin: 0 auto;
    }
    .card-header {
      background: linear-gradient(to right, #4b6cb7, #182848);
      color: white;
      padding: 20px;
      border-radius: 10px 10px 0 0 !important;
    }
    .task-item {
      border-left: 4px solid #4b6cb7;
      margin-bottom: 10px;
      transition: all 0.3s;
    }
    .task-item:hover {
      transform: translateY(-2px);
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    }
    .bi-check-circle {
      color: #28a745;
    }
    .btn-add {
      background: linear-gradient(to right, #4b6cb7, #182848);
      border: none;
    }
    .btn-add:hover {
      background: linear-gradient(to right, #3a56a0, #121d3a);
    }
    .btn-delete {
      background: #dc3545;
      color: white;
    }
    .empty-state {
      text-align: center;
      padding: 30px;
      color: #6c757d;
    }