body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #ffffff;
    color: #333;
}

header {
    text-align: center;
    padding: 40px 20px;
    background-color: #f7f7f7;
    color: #222;
}

h1 {
    margin: 0;
    font-size: 36px;
}

main {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
}

h2 {
    color: #222;
    font-size: 24px;
    margin: 0 0 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.toggle-icon {
    font-size: 18px;
    width: 18px;
    height: 18px;
    transition: transform 0.3s ease;
    padding-right: 8px;
}

.site-lists {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 12px;
}

.site-list-column {
    width: 48%;
}

.site-list {
    list-style-type: none;
    padding: 0;
}

.site-list li {
    margin-bottom: 10px;
}

.site-list a {
    display: block;
    padding: 10px;
    background-color: #f7f7f7;
    color: #0078BD;
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

.site-list a:hover {
    background-color: #e0e0e0;
}

@media (max-width: 768px) {
    .site-lists {
        flex-direction: column;
    }

    .site-list-column {
        width: 100%;
        margin-bottom: 10px;
    }

    h1 {
        font-size: 28px;
    }

    h2 {
        font-size: 21px;
        cursor: pointer;
    }

    .collapsible .toggle-icon {
        display: inline-block;
    }
}

@media (min-width: 769px) {
    .collapsible .toggle-icon {
        display: none;
    }

    hr.divider {
        display: none;
    }
}

hr.divider {
    height: 1px; 
    background-color: rgba(0, 0, 0, 0.09);
    width: 100%;
    border: none;
    margin: 0;
    padding: 0;
}