body {
    font-family: 'Poppins', sans-serif;
    background-color: #f8f9fa;
    padding: 20px;
    text-align: center;
  }
  
  h1 {
    margin-bottom: 10px;
    font-size: 32px;
    color: #2c3e50;
  }
  
  .subtitlu {
    color: #7f8c8d;
    margin-bottom: 30px;
    font-size: 18px;
  }
  
  .lectii-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
  }
  
  .lectie {
    background: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    text-decoration: none;
    color: #34495e;
    font-weight: bold;
    transition: transform 0.2s, background-color 0.3s;
  }
  
  .lectie:hover {
    transform: translateY(-5px);
    background-color: #ecf0f1;
  }
  
  .lectie.citita {
    background-color: #d4edda; /* Verde pentru lecție citită */
    color: #2e7d32;
    text-decoration: line-through;
  }
  
  #progress {
    margin: 20px 0;
    font-size: 18px;
    color: #34495e;
  }
  
  #quizButton {
    padding: 12px 30px;
    font-size: 18px;
    background-color: grey;
    border: none;
    color: white;
    border-radius: 8px;
    cursor: not-allowed;
    transition: 0.3s;
  }
  
  #quizButton.active {
    background-color: #27ae60;
    cursor: pointer;
  }
  .butoane-lectie {
    margin-top: 30px;
  }
  
  .buton-lectie, .buton-intoarcere {
    display: inline-block;
    padding: 12px 25px;
    margin: 5px;
    background-color: #3498db;
    color: white;
    text-decoration: none;
    border-radius: 8px;
    transition: background-color 0.3s;
  }
  
  .buton-lectie:hover, .buton-intoarcere:hover {
    background-color: #2980b9;
  }