body {
            font-family: 'Inter', sans-serif;
            background-color: #f0f2f5;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            margin: 0;
        }
        .quiz-container {
            background-color: #ffffff;
            margin-top: 5%;
            border-radius: 5px;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
            padding: 30px;
            width: 90%;
            /* max-width: 90%; */
            text-align: center;
        }
        .question-text {
            font-size: 1.5rem;
            font-weight: 600;
            white-space: pre;
            margin-bottom: 30px;
            color: #333;
        }
        .option-button {
            background-color: #f7fafc;
            border: 2px solid #e2e8f0;
            border-radius: 5px;
            padding: 15px 20px;
            margin-bottom: 15px;
            width: 100%;
            text-align: left;
            font-size: 1.1rem;
            color: #4a5568;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        .option-button:hover:not(.correct):not(.incorrect) {
            background-color: #edf2f7;
            border-color: #cbd5e0;
        }
        .option-button.correct {
            background-color: #ecfdf5;
            border-color: #38a169;
            color: #2f855a;
        }
        .option-button.incorrect {
            background-color: #fff5f5;
            border-color: #e53e3e;
            color: #c53030;
        }
        .option-button:disabled {
            cursor: not-allowed;
            opacity: 0.7;
        }
        .feedback {
            margin-top: 20px;
            font-size: 120%;
            white-space: pre;
            color: #4a5568;
            text-align: left;
        }
        .feedback .incorrect-label {
            color: #e53e3e;
            font-weight: bold;
        }
        .feedback .correct-label {
            color: #38a169;
            font-weight: bold;
        }
        .navigation-buttons {
            display: flex;
            justify-content: space-between;
            margin-top: 30px;
        }
        .nav-button {
            background-color: #4299e1;
            color: white;
            padding: 12px 25px;
            border-radius: 5px;
            font-size: 1rem;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }
        .nav-button:hover {
            background-color: #3182ce;
        }
        .nav-button:disabled {
            background-color: #a0aec0;
            cursor: not-allowed;
        }
        .results-container {
            margin-top: 40px;
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        .chart-container {
            position: relative;
            width: 200px;
            height: 200px;
            margin-bottom: 20px;
        }
        .chart-percentage {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            font-size: 2.5rem;
            font-weight: 600;
            color: #333;
        }
        canvas {
            display: block;
        }
        .hidden {
            display: none;
        }