body.dark-mode {
    background: #0f172a;
    color: #e2e8f0;
}
body.dark-mode .navbar,
body.dark-mode .sidebar,
body.dark-mode .card,
body.dark-mode .stat-card,
body.dark-mode .chart-container,
body.dark-mode table,
body.dark-mode .table-container {
    background: #1e293b;
    border-color: #334155;
}
body.dark-mode .sidebar nav a       { color: #94a3b8; }
body.dark-mode .sidebar nav a:hover { background: rgba(99,102,241,.15); color: #a5b4fc; }
body.dark-mode .sidebar nav a.active{ background: rgba(99,102,241,.2);  color: #818cf8; }
body.dark-mode .page-header         { border-color: #334155; }
body.dark-mode table th, body.dark-mode table td { border-color: #334155; }
body.dark-mode table td             { color: #cbd5e1; }
body.dark-mode .stat-value          { color: #f1f5f9; }
body.dark-mode .form-control,
body.dark-mode .form-select,
body.dark-mode input, body.dark-mode select {
    background: #0f172a;
    border-color: #334155;
    color: #e2e8f0;
}
body.dark-mode .alert-success { background: #14532d; color: #86efac; border-color: #166534; }
body.dark-mode .alert-error   { background: #4c0519; color: #fda4af; border-color: #9f1239; }
body.dark-mode .navbar-brand  { color: #818cf8; }