body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
}

/* main app layout */

.app {
    display: flex;
    height: 100vh;
}

/* sidebar */

.sidebar {
    width: 220px;
    background: #1e293b;
    color: white;
    padding: 20px;
}

    .sidebar h2 {
        margin-top: 0;
    }

    .sidebar nav a {
        display: block;
        color: white;
        text-decoration: none;
        padding: 10px 0;
    }

        .sidebar nav a:hover {
            color: #38bdf8;
        }

/* main area */

.main {
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* header */

.header {
    background: #f1f5f9;
    padding: 15px;
    border-bottom: 1px solid #ddd;
}

/* page content */

#content {
    padding: 20px;
}