body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f9f9f9;
    max-width: 900px;
    margin: 0 auto;
    padding: 2em;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    color: #1a1a1a;
    margin-top: 1.5em;
}

a {
    color: #007bff;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

pre,
code {
    background-color: #eee;
    border-radius: 4px;
    padding: 0.1em 0.3em;
    font-family: monospace;
}

pre {
    padding: 1em;
    overflow-x: auto;
}

blockquote {
    border-left: 4px solid #ccc;
    padding-left: 1em;
    color: #666;
    margin: 1.5em 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 1em 0;
}

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

th {
    background-color: #f2f2f2;
}

@media (max-width: 767.98px) {
    :root {
        --lvl1-bg: rgba(0, 0, 0, 0.02);
        --lvl2-bg: rgba(0, 0, 0, 0.04);
        --lvl3-bg: rgba(0, 0, 0, 0.06);
        --lvl4-bg: rgba(0, 0, 0, 0.08);

        --li-padding: 0.45rem 0.6rem;
        --li-radius: 8px;
    }

    ul {
        margin: 0;
        padding: 0;
        list-style: none;
    }

    ul li {
        margin: 0.35rem 0;
        padding: var(--li-padding);
        border-radius: var(--li-radius);
    }

    ul>li {
        font-size: 1rem;
        background: var(--lvl1-bg);
    }

    ul ul>li {
        font-size: 0.95rem;
        background: var(--lvl2-bg);
    }

    ul ul ul>li {
        font-size: 0.9rem;
        background: var(--lvl3-bg);
    }

    ul ul ul ul>li {
        font-size: 0.85rem;
        background: var(--lvl4-bg);
    }

    ul ul,
    ul ul ul,
    ul ul ul ul {
        margin: 0;
        padding: 0;
    }
}