.stroop-stimulus-card {
            background: #f8f9fc;
            border-radius: 32px;
            box-shadow: 0 20px 35px -12px rgba(0,0,0,0.15);
            padding: 2.5rem 1rem;
            margin: 1.5rem 0;
            transition: all 0.2s;
            text-align: center;
        }
        .stimulus-word {
            font-size: 5rem;
            font-weight: 800;
            letter-spacing: 2px;
            text-shadow: 2px 2px 6px rgba(0,0,0,0.1);
            transition: transform 0.1s ease;
            font-family: 'Segoe UI', 'Poppins', system-ui, sans-serif;
            min-height: 160px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .color-btn-group {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            justify-content: center;
            margin: 2rem 0 1rem;
        }
        .color-option-btn {
            min-width: 110px;
            font-weight: 600;
            font-size: 1.2rem;
            padding: 0.8rem 1.2rem;
            border-radius: 60px;
            transition: all 0.2s;
            border: 2px solid transparent;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }
        .color-option-btn:active { transform: scale(0.96); }
        .color-option-btn.red { background-color: #dc3545; color: white; border-color: #b02a37; }
        .color-option-btn.green { background-color: #198754; color: white; border-color: #0f5132; }
        .color-option-btn.blue { background-color: #0d6efd; color: white; border-color: #0a58ca; }
        .color-option-btn.yellow { background-color: #ffc107; color: #212529; border-color: #d39e00; }
        .test-progress {
            font-size: 1rem;
            font-weight: 500;
            background: #e9ecef;
            display: inline-block;
            padding: 0.3rem 1rem;
            border-radius: 40px;
        }
        .result-stats {
            background: #ffffff;
            border-radius: 24px;
            padding: 1.5rem;
            margin-top: 1.8rem;
            box-shadow: 0 8px 20px rgba(0,0,0,0.05);
            border: 1px solid #eef2f6;
        }
        .metric-badge {
            background: #f2f4f8;
            border-radius: 28px;
            padding: 0.5rem 1.2rem;
            text-align: center;
        }
        .metric-value {
            font-size: 2rem;
            font-weight: 700;
            color: #1e466e;
        }
        .interference-badge {
            background: linear-gradient(135deg, #f0f4ff, #e9edf5);
            border-left: 4px solid #0d6efd;
        }
        .feedback-toast {
            position: fixed;
            bottom: 20px;
            right: 20px;
            z-index: 1090;
            background: #2c3e66;
            color: white;
            border-radius: 40px;
            padding: 0.6rem 1.2rem;
            font-weight: 500;
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
            opacity: 0;
            transition: opacity 0.2s;
            pointer-events: none;
        }
        .btn-start-test {
            padding: 0.9rem 2.2rem;
            font-weight: 700;
            font-size: 1.2rem;
            border-radius: 60px;
        }
        .instruction-text {
            background: #eef2ff;
            border-radius: 20px;
            padding: 0.8rem 1.5rem;
            font-weight: 500;
        }
        .accuracy-ring {
            font-size: 1.8rem;
            font-weight: 700;
        }
        .authority-ref {
            background: #fef9e6;
        }
        @media (max-width: 576px) {
            .stimulus-word { font-size: 3rem; min-height: 120px; }
            .color-option-btn { min-width: 70px; font-size: 1rem; padding: 0.6rem 0.8rem; }
        }