* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            color: #333;
        }
        
        .container {
            max-width: 800px;
            margin: 0 auto;
            padding: 20px;
        }
        
        .quiz-card {
            background: white;
            border-radius: 20px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
            padding: 40px;
            margin: 20px 0;
            animation: fadeInUp 0.6s ease-out;
        }
        
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .header {
            text-align: center;
            margin-bottom: 40px;
        }
        
        .header h1 {
            font-size: 2.5em;
            color: #2c3e50;
            margin-bottom: 10px;
            background: linear-gradient(135deg, #667eea, #764ba2);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        
        .header h2 {
            font-size: 1.5em;
            color: #7f8c8d;
            font-weight: 300;
            margin-bottom: 20px;
        }
        
        .author {
            font-size: 1.1em;
            color: #34495e;
            font-style: italic;
        }
        
        .progress-bar {
            width: 100%;
            height: 8px;
            background: #ecf0f1;
            border-radius: 4px;
            margin-bottom: 30px;
            overflow: hidden;
        }
        
        .progress-fill {
            height: 100%;
            background: linear-gradient(90deg, #667eea, #764ba2);
            border-radius: 4px;
            transition: width 0.5s ease;
            width: 0%;
        }
        
        .question-container {
            display: none;
            animation: slideIn 0.5s ease-out;
        }
        
        .question-container.active {
            display: block;
        }
        
        @keyframes slideIn {
            from {
                opacity: 0;
                transform: translateX(20px);
            }
            to {
                opacity: 1;
                transform: translateX(0);
            }
        }
        
        .question {
            font-size: 1.4em;
            color: #2c3e50;
            margin-bottom: 30px;
            font-weight: 600;
            line-height: 1.4;
        }
        
        .answers {
            display: grid;
            gap: 15px;
        }
        
        .answer {
            background: #f8f9fa;
            border: 2px solid #e9ecef;
            border-radius: 12px;
            padding: 20px;
            cursor: pointer;
            transition: all 0.3s ease;
            font-size: 1.1em;
            line-height: 1.4;
        }
        
        .answer:hover {
            background: #e3f2fd;
            border-color: #667eea;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(102, 126, 234, 0.2);
        }
        
        .answer.selected {
            background: linear-gradient(135deg, #667eea, #764ba2);
            color: white;
            border-color: #667eea;
        }
        
        .navigation {
            display: flex;
            justify-content: space-between;
            margin-top: 40px;
        }
        
        .btn {
            padding: 15px 30px;
            border: none;
            border-radius: 8px;
            font-size: 1.1em;
            cursor: pointer;
            font-weight: 600;
            transition: all 0.3s ease;
        }
        
        .btn-primary {
            background: linear-gradient(135deg, #667eea, #764ba2);
            color: white;
        }
        
        .btn-primary:hover:not(:disabled) {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
        }
        
        .btn:disabled {
            opacity: 0.5;
            cursor: not-allowed;
        }
        
        .btn-secondary {
            background: #6c757d;
            color: white;
        }
        
        .email-section {
            display: none;
            text-align: center;
        }
        
        .email-section.active {
            display: block;
        }
        
        .email-input {
            width: 100%;
            padding: 15px;
            border: 2px solid #e9ecef;
            border-radius: 8px;
            font-size: 1.1em;
            margin: 20px 0;
        }
        
        .email-input:focus {
            outline: none;
            border-color: #667eea;
            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
        }
        
        .results {
            display: none;
            text-align: center;
        }
        
        .results.active {
            display: block;
        }
        
        .result-card {
            background: linear-gradient(135deg, #f8f9fa, #e9ecef);
            border-radius: 15px;
            padding: 30px;
            margin: 30px 0;
        }
        
        .result-title {
            font-size: 2em;
            color: #2c3e50;
            margin-bottom: 20px;
        }
        
        .result-description {
            font-size: 1.2em;
            line-height: 1.6;
            color: #34495e;
            margin-bottom: 20px;
        }
        
        .loading {
            display: none;
            text-align: center;
            padding: 40px;
        }
        
        .spinner {
            width: 50px;
            height: 50px;
            border: 5px solid #f3f3f3;
            border-top: 5px solid #667eea;
            border-radius: 50%;
            animation: spin 1s linear infinite;
            margin: 0 auto 20px;
        }
        
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        
        .intro {
            text-align: center;
            margin-bottom: 40px;
        }
        
        .intro p {
            font-size: 1.2em;
            line-height: 1.6;
            color: #555;
            margin-bottom: 20px;
        }
        
        .start-btn {
            background: linear-gradient(135deg, #667eea, #764ba2);
            color: white;
            padding: 18px 40px;
            border: none;
            border-radius: 10px;
            font-size: 1.3em;
            cursor: pointer;
            font-weight: 600;
            transition: all 0.3s ease;
        }
        
        .start-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(102, 126, 234, 0.3);
        }