body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f5f5;
}

.sidebar {
    min-height: 100vh;
    box-shadow: 2px 0 5px rgba(0,0,0,0.1);
}

.sidebar .nav-link {
    color: #fff;
    padding: 1rem;
    transition: all 0.3s;
}

.sidebar .nav-link:hover {
    background-color: #495057;
    border-radius: 5px;
}

.sidebar .nav-link i {
    margin-right: 10px;
}

.sidebar .nav-link.active {
    background-color: #0d6efd;
    border-radius: 5px;
}

#content-area {
    padding: 20px;
}

.card {
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

.btn {
    border-radius: 5px;
    padding: 8px 20px;
}