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

.banner {
    background: #2c3e50;
    color: #fff;
    padding: 1rem;
    text-align: center;
}

.container {
    display: flex;
    min-height: 90vh;
}

.sidebar {
    background: #34495e;
    color: #fff;
    width: 220px;
    min-width: 150px;
    padding: 1rem 0;
}

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

.sidebar a {
    color: #fff;
    text-decoration: none;
    display: block;
    padding: 0.75rem 1.5rem;
}

.content {
    flex: 1;
    padding: 2rem;
    background: #f4f4f4;
}

/* Responsive for mobile */
@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        min-width: 0;
    }
}