* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', sans-serif;
    display: flex;
    background-color: #ffffff;
    color: #333333;
    height: 100vh;
    overflow: hidden;
}

#navbar {
    width: 300px;
    background-color: #f9f9f9;
    border-right: 1px solid #ccc;
    padding: 1rem 0;
    overflow-y: auto;
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
}

#navbar header {
    font-size: 1.8rem;
    font-weight: bold;
    text-align: center;
    margin-bottom: 2rem;
}

#navbar ul {
    list-style-type: none;
}

#navbar li {
    border-top: 1px solid #ccc;
}

#navbar li:first-child {
    border-top: none;
}

.nav-link {
    display: block;
    padding: 1rem 1.5rem;
    text-decoration: none;
    color: #333;
    transition: background-color 0.3s ease;
}

.nav-link:hover {
    background-color: #eaeaea;
}

#main-doc {
    margin-left: 300px;
    padding: 2rem;
    height: 100vh;
    overflow-y: auto;
    width: calc(100% - 300px);
}

.main-section {
    margin-bottom: 2.5rem;
}

.main-section header {
    font-size: 2rem;
    margin-bottom: 1rem;
    border-bottom: 2px solid #ccc;
    padding-bottom: 0.5rem;
}

.main-section p {
    margin-bottom: 1rem;
}

.main-section ul {
    margin: 1rem 0 1rem 2rem;
}

code {
    background-color: #f5f5f5;
    border: 1px solid #ddd;
    padding: 0.75rem;
    display: block;
    text-align: left;
    margin: 1rem 0;
    white-space: pre-wrap;
    font-family: Consolas, monospace;
    border-radius: 5px;
}

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

    #navbar {
        width: 100%;
        height: auto;
        position: relative;
        border-right: none;
        border-bottom: 1px solid #ccc;
    }

    #main-doc {
        margin-left: 0;
        width: 100%;
        height: calc(100vh - 300px);
    }

    #navbar header {
        font-size: 1.5rem;
        margin-bottom: 1rem;
    }

    .nav-link {
        padding: 0.75rem 1rem;
    }
}