body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            margin: 0;
            padding: 0;
            background-color: #f8f9fa;
            color: #333;
        }
        .container {
            max-width: 95%;
            width: 1200px;
            margin: 0 auto;
            padding: 20px;
            background-color: white;
            box-shadow: 0 0 20px rgba(0,0,0,0.1);
            border-radius: 8px;
            margin-top: 30px;
            margin-bottom: 30px;
        }
        .header-box {
            width: 100%;
            border: 2px dashed #28a745;
            box-sizing: border-box;
            padding: 15px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background-color: white;
            min-height: 80px;
            border-radius: 8px;
            margin-bottom: 25px;
            background: white;
        }
        .left-image,
        .right-image {
            max-height: 60px;
            height: auto;
            margin: 10px;
        }
        .problem-title {
            font-size: 1.8em;
            font-weight: bold;
            color: black;
            margin: 25px 0 15px 0;
            text-align: center;
            text-shadow: 1px 1px 2px rgba(0,0,0,0.1);
        }
        .main-page-title { /* Stile per il titolo principale */
            font-size: 2.2em;
            font-weight: bold;
            text-align: center;
            margin-bottom: 30px;
        }
        .main-page-title .blue {
            color: #0000FF; /* Blu */
        }
        .main-page-title .red {
            color: #FF0000; /* Rosso */
        }
        .separator {
            border: 0;
            height: 2px;
            background: linear-gradient(to right, transparent, #28a745, transparent);
            margin: 15px 0 25px 0;
        }
        .problem-text {
            font-weight: bold;
            margin-left: 8px;
            padding-left: 17px;
            margin-bottom: 25px;
            color: #2c3e50;
            font-size: 1.1em;
            line-height: 1.7;
        }
        .solution {
            display: none;
            background-color: #f8f9fa;
            padding: 15px 15px 15px 25px;
            margin: 15px 0 15px 8px;
border-left: 4px solid #0000FF; /* Questo cambierà la linea verticale in blu */            border-radius: 0 5px 5px 0;
            box-shadow: 0 2px 5px rgba(0,0,0,0.05);
            position: relative;
        }
        button {
            background-color: #a5d6a7;
            color: black;
            border: 2px solid #81c784;
            padding: 10px 20px;
            text-align: center;
            text-decoration: none;
            display: inline-block;
            font-size: 14px;
            margin: 8px 4px;
            cursor: pointer;
            border-radius: 25px;
            transition: all 0.3s ease;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
            font-weight: 600;
        }
        button:hover {
            background-color: #81c784;
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0,0,0,0.15);
        }
		
       h3 {
    color: #28a745;
    border-bottom: none;
    padding-bottom: 0;
    /* Riduciamo lo spazio SOPRA h3 */
    margin-top: 15px; 
    /* Aggiungiamo un piccolo margine fisso SOTTO h3 */
    margin-bottom: 5px; 
    font-size: 1.4em;
}
        .graph {
            text-align: center;
            margin: 25px 0;
            padding: 15px;
            background-color: white;
            border-radius: 8px;
            box-shadow: 0 3px 10px rgba(0,0,0,0.08);
            border: 1px solid #e9ecef;
        }
        .graph img {
            max-width: 100%;
            height: auto;
            border-radius: 5px;
        }
        .MathJax {
            font-size: 1.1em;
            color: #2c3e50;
        }
        a {
            text-decoration: none;
        }
        .question {
            background-color: #f8f9fa;
            padding: 15px 15px 15px 25px;
            margin-left: 8px;
            border-radius: 8px;
            margin-bottom: 20px;
            border-left: 4px solid #6c757d;
            position: relative;

        }
        .question strong {
            color: #2c3e50;
        }
        .footer {
            text-align: center;
            margin-top: 40px;
            padding-top: 20px;
            border-top: 1px solid #e9ecef;
        }
   .my-table {
    border-collapse: collapse; /* per unire i bordi come con border=1 */
    border: 1px solid #000;    /* sostituisce border="1" */
    padding: 5px;               /* sostituisce cellpadding="5" */
}

.my-table td,
.my-table th {
    border: 1px solid #000;
    padding: 5px;
}