.sidebar {
    width: 250px;
    min-height: 100vh;
    background: #1a1a2e;
    color: #fff;
    transition: all 0.3s;
    position: fixed;
    left: 0;
    top: 0;
    z-index: 999;
    box-shadow: 4px 0 10px rgba(0, 0, 0, 0.1);
}

.content-wrapper {
    margin-left: 250px;
    min-height: 100vh;
    background-color: #f8f9fc;
    transition: all 0.3s;
}

.nav-link {
    color: #fff;
    padding: 0.5rem 1rem;
    margin: 0.2rem 0.5rem;
    border-radius: 0.25rem;
    transition: all 0.3s;
}

.nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.nav-link.active {
    background-color: #4361ee;
    color: white !important;
}

.brand-link {
    padding: 1rem;
    font-size: 1.25rem;
    text-decoration: none;
    color: #fff;
    display: block;
    text-align: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

/* For mobile responsiveness */
@media (max-width: 768px) {
    .sidebar {
        margin-left: -250px;
    }
    
    .sidebar.active {
        margin-left: 0;
    }
    
    .content-wrapper {
        margin-left: 0;
    }
    
    .content-wrapper.active {
        margin-left: 250px;
    }
}