:root {
    --sidebar-width: 250px;
}

body {
    background: #f4f6f9;
}

.login-page {
    background: linear-gradient(135deg, #0d6efd 0%, #6610f2 100%);
}

.login-card {
    border: none;
    border-radius: 12px;
}

#sidebar {
    width: var(--sidebar-width);
    min-height: 100vh;
    position: sticky;
    top: 0;
}

#sidebar .nav-link {
    border-radius: 6px;
    padding: 0.55rem 0.75rem;
}

#sidebar .nav-link:hover {
    background: rgba(255, 255, 255, 0.1);
}

.topbar {
    background: #fff;
    border-bottom: 1px solid #dee2e6;
}

.stat-card {
    border-left: 4px solid #0d6efd;
}

.table td, .table th {
    vertical-align: middle;
}

@media (max-width: 768px) {
    #sidebar {
        display: none;
    }
}