body.dark {
            --primary-color: #4ea1c2;
            --accent-color: #2c7da0;
            --light-gray: #2d3748;
            --border-color: #4a5568;
            --text-muted: #a0aec0;
            --bg-body: #1a202c;
            --bg-card: #2d3748;
            --text-color: #e2e8f0;
            background-color: var(--bg-body);
            color: var(--text-color);
        }
        .stat-card {
            background:#fff;
            border-radius: 16px;
            padding: 1rem;
            box-shadow: 0 4px 8px rgba(0,0,0,0.02);
            border: 1px solid var(--border-color);
            margin-bottom: 1rem;
        }
        .stat-label {
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: var(--text-muted);
        }
        .stat-number {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--primary-color);
        }
        canvas#distCanvas {
            background: var(--bg-card);
            border-radius: 12px;
            width: 100%;
            height: auto;
            border: 1px solid var(--border-color);
        }
        .nav-tabs .nav-tabs .footer a {
            color: #cddbe9;
        }
        body.dark .invalid-feedback-custom {
            color: #dc3545;
            font-size: 0.875rem;
            margin-top: 0.25rem;
        }
        body.dark @media (max-width: 768px) {
            .stat-number { font-size: 1.2rem; }
        }