body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f4f6f9;
}
.sidebar {
    box-shadow: 2px 0 5px rgba(0,0,0,0.1);
    min-height: 100vh;
}
.nav-link:hover {
    background-color: #495057;
    border-radius: 5px;
}
.card {
    border: none;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}