* {
            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;
            padding: 10px;
        }
        .container {
            max-width: 900px;
            margin: 0 auto;
            background: white;
            border-radius: 15px;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
            overflow: hidden;
        }
        .header {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 20px;
            text-align: center;
        }
        .header-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            flex-wrap: wrap;
        }
        .logo-container img {
            height: 50px;
            object-fit: contain;
        }
        .site-link {
            color: white;
            text-decoration: underline;
            font-weight: bold;
            font-size: 1.1em;
            white-space: nowrap;
        }
        .header h1 {
            font-size: 2em;
            margin: 15px 0 5px;
            width: 100%;
            text-align: center;
        }
        .header p {
            font-size: 1em;
            opacity: 0.9;
        }
        .adsense-placeholder {
            text-align: center;
            padding: 10px;
            background: #f5f5f5;
            font-size: 0.85em;
            color: #777;
            border-bottom: 1px solid #eee;
        }
        .module-selector {
            padding: 25px;
            background: #f8f9fa;
            border-bottom: 2px solid #e9ecef;
        }
        .module-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 12px;
        }
        .module-btn {
            padding: 12px;
            border: 2px solid #667eea;
            background: white;
            border-radius: 10px;
            cursor: pointer;
            font-size: 0.95em;
            font-weight: 600;
            transition: all 0.3s ease;
            color: #667eea;
            text-align: center;
        }
        .module-btn:hover {
            background: #667eea;
            color: white;
            transform: translateY(-2px);
        }
        .module-btn.active {
            background: #667eea;
            color: white;
        }
        .quiz-container {
            display: none;
            padding: 25px;
        }
        .quiz-container.active {
            display: block;
        }
        .progress-bar {
            width: 100%;
            height: 8px;
            background: #e9ecef;
            border-radius: 10px;
            margin-bottom: 25px;
            overflow: hidden;
        }
        .progress-fill {
            height: 100%;
            background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
            transition: width 0.3s ease;
        }
        .question-card {
            margin-bottom: 25px;
        }
        .question-number {
            color: #667eea;
            font-weight: 600;
            font-size: 0.9em;
            margin-bottom: 10px;
        }
        .question-text {
            font-size: 1.2em;
            font-weight: 600;
            color: #333;
            margin-bottom: 20px;
        }
        .options {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .option {
            padding: 14px;
            border: 2px solid #e9ecef;
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            background: white;
        }
        .option:hover {
            border-color: #667eea;
            background: #f0f4ff;
        }
        .option input[type="checkbox"],
        .option input[type="radio"] {
            margin-right: 15px;
            width: 20px;
            height: 20px;
            cursor: pointer;
        }
        .option.selected {
            border-color: #667eea;
            background: #f0f4ff;
        }
        .option.correct {
            border-color: #28a745;
            background: #d4edda;
        }
        .option.incorrect {
            border-color: #dc3545;
            background: #f8d7da;
        }
        .button-group {
            display: flex;
            gap: 15px;
            justify-content: space-between;
            margin-top: 25px;
        }
        button {
            padding: 12px 25px;
            border: none;
            border-radius: 8px;
            font-size: 1em;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        .btn-prev {
            background: #e9ecef;
            color: #333;
        }
        .btn-prev:hover {
            background: #dee2e6;
        }
        .btn-next, .btn-submit {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
        }
        .btn-next:hover, .btn-submit:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
        }
        .results-container {
            display: none;
            padding: 35px;
            text-align: center;
        }
        .results-container.active {
            display: block;
        }
        .score-circle {
            width: 180px;
            height: 180px;
            border-radius: 50%;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            margin: 0 auto 25px;
            font-size: 2.5em;
            font-weight: bold;
        }
        .score-percentage {
            font-size: 2em;
            font-weight: bold;
            color: #333;
            margin-bottom: 10px;
        }
        .score-label {
            font-size: 1.2em;
            color: #666;
            margin-bottom: 25px;
        }
        .result-details {
            background: #f8f9fa;
            padding: 20px;
            border-radius: 10px;
            margin-bottom: 25px;
            text-align: left;
        }
        .result-item {
            padding: 10px 0;
            border-bottom: 1px solid #e9ecef;
        }
        .result-item:last-child {
            border-bottom: none;
        }
        .btn-restart {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 14px 40px;
            font-size: 1.1em;
        }
        .hidden {
            display: none;
        }
        @media (max-width: 600px) {
            .header-content {
                flex-direction: column;
                text-align: center;
            }
            .site-link {
                margin-top: 10px;
            }
            .header h1 {
                font-size: 1.7em;
            }
        }