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

html {
    scroll-behavior: smooth;
}

body {
    display: flex;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
}

#navbar {
    position: fixed;
    min-width: 290px;
    top: 0;
    left: 0;
    width: 300px;
    height: 100%;
    border-right: solid;
    border-color: rgba(0, 22, 22, 0.4);
    background-color: #f8f9fa;
    padding: 20px;
    overflow-y: auto;
}

#navbar header {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: #2c3e50;
    text-align: center;
    padding-bottom: 10px;
    border-bottom: 1px solid #ddd;
}

#navbar a {
    display: block;
    padding: 10px 15px;
    color: #2c3e50;
    text-decoration: none;
    border-bottom: 1px solid #ddd;
    transition: all 0.3s ease;
}

#navbar a:hover {
    background-color: #e9ecef;
    color: #007bff;
}

#main-doc {
    position: absolute;
    margin-left: 310px;
    padding: 20px;
    margin-bottom: 110px;
}

.main-section {
    margin-bottom: 40px;
}

.main-section header {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #2c3e50;
    padding-bottom: 5px;
    border-bottom: 1px solid #eee;
}

.main-section p {
    margin-bottom: 15px;
}

.main-section code {
    display: block;
    background-color: #f8f9fa;
    padding: 8px 15px;
    margin: 10px 0;
    border-radius: 5px;
    font-family: 'Courier New', Courier, monospace;
    white-space: pre-wrap;
    line-height: 1.4;
    tab-size: 2;
}

.main-section ul {
    margin: 15px 0 15px 40px;
}

.main-section li {
    margin-bottom: 10px;
}

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

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

    #main-doc {
        margin-left: 0;
        margin-top: 20px;
    }
}