:root {
    --primary-color: #2c3e50;
    --secondary-color: #007bff;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --danger-color: #c0392b;
    --light-color: #ecf0f1;
    --bg-color: #e8ecef;
    --column-bg: #f8f9fa;
  }
  
  body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
  }
  
  .header {
    background-color: #2c3e50;
    color: white;
    padding: 1rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
  }
  
  .back-button {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.3s;
    text-decoration: none;
    margin-top: 10px;
  }
  
  .back-button:hover {
    background-color: #2980b9;
  }
  
  .license-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
  }
  
  .license-message {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
    max-width: 80%;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
  }
  
  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
  }
  
  .task-form {
    background-color: var(--column-bg);
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    margin-bottom: 30px;
    border: 1px solid #dee2e6;
  }
  
  .input-group {
    margin-bottom: 20px;
  }
  
  .input-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--primary-color);
    font-weight: bold;
    font-size: 0.95rem;
  }
  
  .input-group input, 
  .input-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ced4da;
    border-radius: 6px;
    font-size: 14px;
    transition: border-color 0.3s, box-shadow 0.3s;
    background-color: white;
  }
  
  .input-group input:focus,
  .input-group textarea:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(0,123,255,0.1);
  }
  
  .button {
    background-color: var(--secondary-color);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s;
  }
  
  .button:hover {
    background-color: #0056b3;
    transform: translateY(-1px);
  }
  
  .tasks-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
  }
  
  .tasks-column {
    background-color: var(--column-bg);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    border: 1px solid #dee2e6;
  }
  
  .column-header {
    color: var(--primary-color);
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--secondary-color);
    font-size: 1.25rem;
  }
  
  .task-card {
    background-color: white;
    padding: 20px;
    margin-bottom: 15px;
    border-radius: 8px;
    transition: all 0.3s;
    border: 1px solid #e9ecef;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  }
  
  .task-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
  }
  
  .task-title {
    font-weight: bold;
    margin-bottom: 8px;
    color: var(--primary-color);
    font-size: 1.1rem;
  }
  
  .task-description {
    font-size: 14px;
    color: #495057;
    margin-bottom: 15px;
    line-height: 1.5;
  }
  
  .task-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
  }
  
  .task-actions button {
    padding: 8px 12px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    color: white;
    transition: all 0.3s;
    font-weight: 500;
  }
  
  .move-btn {
    background-color: var(--warning-color);
  }
  
  .move-btn:hover {
    background-color: #e67e22;
  }
  
  .delete-btn {
    background-color: var(--danger-color);
  }
  
  .delete-btn:hover {
    background-color: #a93226;
  }
  
  @media (max-width: 768px) {
    .tasks-container {
      grid-template-columns: 1fr;
    }
    
    .container {
      padding: 15px;
    }
    
    .task-form {
      padding: 20px;
    }
  }