body {
    font-size: 0.96rem;
}

.sidebar {
    width: 260px;
    min-height: 100vh;
    position: sticky;
    top: 0;
}

.card {
    transition: 0.18s ease;
}

.card:hover {
    transform: translateY(-2px);
}

.btn,
.form-control {
    border-radius: 12px;
}

@media (max-width: 991px) {
    .sidebar {
        width: 100%;
        min-height: auto;
        position: relative;
    }

    body > .d-flex {
        flex-direction: column;
    }
}
main { min-width: 0; }
@media (max-width: 991px) {
    .sidebar nav { flex-direction: row !important; flex-wrap: wrap; }
    .sidebar { border-bottom: 1px solid #ddd; }
    .sidebar > .mb-4 { margin-bottom: .7rem !important; }
    main.p-4 { padding: 1rem !important; }
}