body.dark-mode { background-color: #121212; color: #f1f1f1; }
    .dark-mode .form-control, .dark-mode .btn { background-color: #1e1e1e; color: #fff; }
    .stat-box { background: #f7f7f7; padding: 10px; border-radius: 6px; margin-bottom: 10px; }