.card {
            background: var(--message-bg);
            padding: 20px;
            border-radius: 10px;
            margin-bottom: 20px;
        }

        .options {
            margin: 15px 0;
        }

        .option-btn {
            display: block;
            width: 100%;
            padding: 10px;
            margin: 5px 0;
            background: var(--input-bg);
            border: 1px solid var(--border-color);
            border-radius: 5px;
            cursor: pointer;
            transition: all 0.3s;
            color: var(--text-color);
            text-align: left;
        }

        .option-btn:hover {
            background: var(--primary-color);
            opacity: 0.8;
        }

        .selected {
            background: var(--primary-color);
            border-color: var(--primary-color);
        }

        #stats {
            background: var(--input-bg);
            padding: 15px;
            border-radius: 5px;
            margin-top: 20px;
        }

        #submitBtn {
            background: var(--primary-color);
            color: white;
            border: none;
            padding: 10px 20px;
            border-radius: 5px;
            cursor: pointer;
            display: inline-block;
        }

        #resultMessage {
            display: inline-block;
            margin-left: 10px;
            font-weight: bold;
            font-size: 16px;
        }

        .success {
            color: #28a745;
        }

        .error {
            color: #dc3545;
        }

        .progress-container {
            width: 100%;
            max-width: 500px;
            margin: 20px auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .progress-bar {
            flex: 1;
            height: 10px;
            background: var(--input-bg);
            border-radius: 5px;
            margin: 0 10px;
            overflow: hidden;
        }

        .progress-fill {
            height: 100%;
            background: var(--primary-color);
            width: 0%;
            transition: width 0.3s;
        }

        .score {
            font-weight: bold;
            min-width: 30px;
            text-align: center;
        }

        .question-container {
            width: 100%;
            max-width: 500px;
            margin: 0 auto;
            padding: 15px;
            background: var(--message-bg);
            border-radius: 10px;
        }

        .timer {
            font-size: 1.2rem;
            text-align: center;
            margin: 10px 0;
            color: var(--primary-color);
        }