body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
    display: flex;
    min-height: 100vh;
}

/* Sidebar Navigation */
nav {
    width: 250px;
    background-color: #2c3e50;
    color: #ecf0f1;
    padding: 20px;
    box-sizing: border-box;
    flex-shrink: 0;
}

nav h2 {
    color: #ecf0f1;
    font-size: 1.2em;
    margin-bottom: 20px;
    border-bottom: 2px solid #34495e;
    padding-bottom: 10px;
}

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

nav ul li {
    margin-bottom: 10px;
}

nav ul li a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s;
    display: block;
    padding: 5px 0;
}

nav ul li a:hover {
    color: #ecf0f1;
    padding-left: 5px;
}

nav ul li a.active {
    color: #fff;
    font-weight: bold;
}

/* Main Content */
main {
    flex-grow: 1;
    padding: 40px;
    background-color: #fff;
    overflow-y: auto;
}

header {
    margin-bottom: 30px;
    border-bottom: 1px solid #eee;
    padding-bottom: 20px;
}

h1 {
    color: #2c3e50;
    margin-top: 0;
}

h2, h3 {
    color: #34495e;
}

a {
    color: #2980b9;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

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

    nav {
        width: 100%;
        padding: 10px 20px;
    }

    main {
        padding: 20px;
    }
}