body {
    min-height: 100vh;
    --bs-body-font-family: Helvetica;
    --bs-body-font-size: 18px;
}

/* Responsive sidebar toggle behavior */
.sidebar { min-height: 100vh; }
@media (max-width: 767.98px) {
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: 260px;
        max-width: 85vw;
        transform: translateX(-100%);
        transition: transform .3s ease;
        z-index: 1045; /* above content */
        box-shadow: 0 .5rem 1rem rgba(0,0,0,.15);
    }
    .sidebar.open { transform: translateX(0); }
    .sidebar-backdrop {
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,.5);
        display: none;
        z-index: 1040; /* behind sidebar */
    }
    .sidebar-backdrop.show { display: block; }
}

.nav-link.active {
    font-weight: 600;
}