body {
    background-color: #f4f6f9;
}

.sidebar {
    height: 100vh;
    background: linear-gradient(180deg, #0d6efd, #0a58ca);
    color: white;
}

.sidebar a {
    color: white;
    text-decoration: none;
    padding: 12px;
    display: block;
    border-radius: 5px;
}

.sidebar a:hover {
    background: rgba(255,255,255,0.2);
}

.card {
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}