:root {
    --brand: #4f46e5;
    --brand-rgb: 79, 70, 229;
    --sidebar-width: 260px;
}

body {
    background-color: var(--bs-tertiary-bg);
}

.brand-color { color: var(--brand) !important; }
.bg-brand { background-color: var(--brand) !important; }
.btn-brand { background-color: var(--brand); border-color: var(--brand); color: #fff; }
.btn-brand:hover { filter: brightness(0.92); color: #fff; }
.bg-brand-subtle { background-color: rgba(var(--brand-rgb), .15); color: var(--brand); }
.text-brand { color: var(--brand); }

/* App shell */
.app-shell { min-height: 100vh; }

.sidebar {
    width: var(--sidebar-width);
    min-height: 100vh;
    position: sticky;
    top: 0;
    border-right: 1px solid var(--bs-border-color);
    overflow-y: auto;
}

.sidebar .nav-link {
    color: var(--bs-body-color);
    border-radius: .5rem;
    padding: .5rem .75rem;
    font-size: .925rem;
}

.sidebar .nav-link.active {
    background-color: rgba(var(--brand-rgb), .12);
    color: var(--brand);
    font-weight: 600;
}

.sidebar .nav-link:hover { background-color: var(--bs-secondary-bg); }

.sidebar-section-title {
    font-size: .7rem;
    text-transform: uppercase;
    letter-spacing: .05em;
    color: var(--bs-secondary-color);
    padding: .75rem .75rem .25rem;
}

.main-content { flex: 1; min-width: 0; }

.topbar {
    position: sticky;
    top: 0;
    z-index: 1020;
    background-color: var(--bs-body-bg);
    border-bottom: 1px solid var(--bs-border-color);
}

.stat-card {
    border: 1px solid var(--bs-border-color);
    border-radius: .75rem;
    background-color: var(--bs-body-bg);
}

.stat-card .stat-icon {
    width: 3rem;
    height: 3rem;
    border-radius: .75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.card { border: 1px solid var(--bs-border-color); }

.empty-state {
    text-align: center;
    padding: 3rem 1.5rem;
    color: var(--bs-secondary-color);
}

.table-responsive-card thead { background-color: var(--bs-secondary-bg); }

.avatar-sm {
    width: 2.25rem;
    height: 2.25rem;
    border-radius: 50%;
    object-fit: cover;
    background-color: var(--bs-secondary-bg);
}

.auth-shell {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(var(--brand-rgb), .08), var(--bs-tertiary-bg));
}

.auth-card { max-width: 420px; width: 100%; }

.badge-status-active { background-color: #198754; }
.badge-status-inactive { background-color: #6c757d; }
.badge-status-pending { background-color: #fd7e14; }

@media (max-width: 991.98px) {
    .sidebar {
        position: fixed;
        left: -100%;
        top: 0;
        height: 100vh;
        z-index: 1050;
        background-color: var(--bs-body-bg);
        transition: left .2s ease-in-out;
    }
    .sidebar.show { left: 0; box-shadow: 0 0 2rem rgba(0,0,0,.25); }
    .sidebar-backdrop {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,.4);
        z-index: 1040;
    }
    .sidebar-backdrop.show { display: block; }
}

.developer-footer {
    font-size: .8rem;
    color: var(--bs-secondary-color);
}