table {
    border-collapse: collapse;
    width: 100%;
}

th, td {
    border: 1px solid #ddd;
    padding: 8px;
    text-align: left;
}

th {
    background: #f4f4f4;
}

.toggle-btn {
    cursor: pointer;
    background: #007bff;
    color: white;
    border: none;
    padding: 5px 10px;
    border-radius: 4px;
}

.hidden-cols {
    display: none;
}

@media screen and (max-width: 750px) {
    /* hide after 2nd column (adjust as needed) */
    td:nth-child(n+3),
    th:nth-child(n+3) {
        display: none;
    }

    td.hidden-cols {
        display: block;
        border-top: none;
        background: #fafafa;
    }
}