/* Reset e stili globali */
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: 'Roboto', sans-serif;
      background: #f4f4f4;
      color: #333;
      line-height: 1.6;
    }
    header {
      background: #005a87;
      color: #fff;
      padding: 20px 0;
      text-align: center;
    }
    header h1 { font-size: 2.5rem; }
    .container {
      width: 90%;
      max-width: 1000px;
      margin: 20px auto;
      background: #fff;
      padding: 20px;
      border-radius: 8px;
      box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    }
    .form-group { margin-bottom: 15px; }
    label {
      display: block;
      margin-bottom: 5px;
      font-weight: 700;
    }
    select, input[type="number"] {
      width: 100%;
      padding: 10px;
      font-size: 1rem;
      border: 1px solid #ddd;
      border-radius: 4px;
    }
    select[multiple] { height: 150px; }
    button {
      background: #005a87;
      color: #fff;
      border: none;
      padding: 10px 15px;
      border-radius: 5px;
      cursor: pointer;
      font-size: 1rem;
    }
    button:hover { background: #004466; }
    hr { margin: 30px 0; }
    .chart-section { margin-bottom: 40px; }
    canvas { width: 100% !important; max-height: 500px; }
    footer { text-align: center; margin: 20px 0; font-size: 0.9rem; color: #777; }
    @media (max-width:600px) {
      header h1 { font-size: 1.8rem; }
    }