body {
    background-color: #f8f9fa;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.sidebar {
    position: fixed;
    top: 56px;
    left: 0;
    height: calc(100vh - 56px);
    z-index: 100;
}

.content {
    margin-left: 250px;
    padding: 20px;
    min-height: calc(100vh - 56px);
}

.navbar-brand {
    font-weight: bold;
}

.card {
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    border: 1px solid rgba(0, 0, 0, 0.125);
}

.sidebar .nav-link {
    color: #495057;
    padding: 12px 15px;
    border-radius: 0.25rem;
    margin: 2px 0;
    transition: all 0.3s;
}

.sidebar .nav-link:hover {
    background-color: #007bff;
    color: white;
}

.sidebar .nav-link.active {
    background-color: #007bff;
    color: white;
}

@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
    }
    
    .content {
        margin-left: 0;
    }
}

.list-group-item {
    border: 1px solid rgba(0,0,0,.125);
    margin-bottom: 5px;
}