* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Poppins', sans-serif;
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            min-height: 100vh;
        }

        .test-container {
            max-width: 900px;
            margin: 40px auto;
            padding: 20px;
        }

        .test-header {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 40px;
            border-radius: 15px;
            text-align: center;
            margin-bottom: 30px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
        }

        .test-header h1 {
            font-size: 2.5em;
            margin-bottom: 10px;
            font-weight: 700;
        }

        .test-header p {
            font-size: 1.1em;
            opacity: 0.95;
        }

        .test-info {
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: white;
            padding: 20px 30px;
            border-radius: 10px;
            margin-bottom: 30px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            flex-wrap: wrap;
            gap: 15px;
        }

        .timer {
            font-size: 1.5em;
            font-weight: 600;
            color: #667eea;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .timer.warning {
            color: #e74c3c;
            animation: pulse 1s infinite;
        }

        @keyframes pulse {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.7; }
        }

        .progress-container {
            flex: 1;
            min-width: 200px;
        }

        .progress-label {
            font-size: 0.9em;
            color: #666;
            margin-bottom: 5px;
        }

        .progress-bar {
            width: 100%;
            height: 10px;
            background: #e0e0e0;
            border-radius: 5px;
            overflow: hidden;
        }

        .progress-fill {
            height: 100%;
            background: linear-gradient(90deg, #667eea, #764ba2);
            transition: width 0.3s ease;
        }

        .question-card {
            background: white;
            padding: 40px;
            border-radius: 15px;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
            margin-bottom: 30px;
        }

        .question-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 25px;
            padding-bottom: 15px;
            border-bottom: 2px solid #f0f0f0;
        }

        .question-number {
            font-size: 1.1em;
            font-weight: 600;
            color: #667eea;
        }

        .question-topic {
            background: #f0f4ff;
            color: #667eea;
            padding: 5px 15px;
            border-radius: 20px;
            font-size: 0.9em;
            font-weight: 500;
        }

        .question-text {
            font-size: 1.2em;
            font-weight: 500;
            color: #333;
            margin-bottom: 30px;
            line-height: 1.6;
        }

        .options {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .option {
            padding: 18px 25px;
            border: 2px solid #e0e0e0;
            border-radius: 10px;
            cursor: pointer;
            transition: all 0.3s ease;
            font-size: 1.05em;
            background: white;
        }

        .option:hover {
            border-color: #667eea;
            background: #f8f9ff;
            transform: translateX(5px);
        }

        .option.selected {
            border-color: #667eea;
            background: #f0f4ff;
            font-weight: 500;
        }

        .navigation {
            display: flex;
            justify-content: space-between;
            gap: 15px;
            margin-top: 30px;
        }

        .btn {
            padding: 14px 30px;
            border: none;
            border-radius: 8px;
            font-size: 1.05em;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            font-family: 'Poppins', sans-serif;
        }

        .btn-primary {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
        }

        .btn-secondary {
            background: #f0f0f0;
            color: #333;
        }

        .btn-secondary:hover {
            background: #e0e0e0;
        }

        .btn:disabled {
            opacity: 0.5;
            cursor: not-allowed;
        }

        .btn-submit {
            background: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%);
            color: white;
        }

        .btn-submit:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(231, 76, 60, 0.4);
        }

        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.7);
            z-index: 1000;
            overflow-y: auto;
        }

        .modal.active {
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }

        .modal-content {
            background: white;
            padding: 40px;
            border-radius: 20px;
            max-width: 900px;
            width: 100%;
            max-height: 90vh;
            overflow-y: auto;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
        }

        .results-header {
            text-align: center;
            margin-bottom: 40px;
        }

        .score-display {
            font-size: 4em;
            font-weight: 700;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 10px;
        }

        .score-label {
            font-size: 1.3em;
            color: #666;
        }

        .performance-summary {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin-bottom: 40px;
        }

        .stat-card {
            background: #f8f9ff;
            padding: 20px;
            border-radius: 10px;
            text-align: center;
        }

        .stat-value {
            font-size: 2em;
            font-weight: 700;
            color: #667eea;
        }

        .stat-label {
            color: #666;
            margin-top: 5px;
        }

        .feedback-section {
            background: #fff9e6;
            padding: 25px;
            border-radius: 10px;
            margin-bottom: 30px;
            border-left: 5px solid #f39c12;
        }

        .feedback-section h3 {
            color: #f39c12;
            margin-bottom: 15px;
        }

        .weak-topics {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 15px;
        }

        .topic-badge {
            background: #e74c3c;
            color: white;
            padding: 8px 15px;
            border-radius: 20px;
            font-size: 0.9em;
        }

        .suggestions {
            background: #e8f8f0;
            padding: 20px;
            border-radius: 10px;
            border-left: 5px solid #27ae60;
        }

        .suggestions h4 {
            color: #27ae60;
            margin-bottom: 10px;
        }

        .suggestions ul {
            list-style-position: inside;
            color: #333;
        }

        .suggestions li {
            margin-bottom: 8px;
        }

        .results-table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 30px;
        }

        .results-table th,
        .results-table td {
            padding: 12px;
            text-align: left;
            border-bottom: 1px solid #e0e0e0;
        }

        .results-table th {
            background: #f8f9ff;
            font-weight: 600;
            color: #667eea;
        }

        .results-table tr:hover {
            background: #f8f9ff;
        }

        .answer-status {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 15px;
            font-size: 0.85em;
            font-weight: 600;
        }

        .answer-status.correct {
            background: #e8f8f0;
            color: #27ae60;
        }

        .answer-status.incorrect {
            background: #fdecea;
            color: #e74c3c;
        }

        .start-screen {
            text-align: center;
            padding: 60px 40px;
        }

        .start-screen h2 {
            font-size: 2em;
            color: #333;
            margin-bottom: 20px;
        }

        .test-instructions {
            background: #f8f9ff;
            padding: 30px;
            border-radius: 10px;
            text-align: left;
            margin: 30px 0;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }

        .test-instructions h3 {
            color: #667eea;
            margin-bottom: 15px;
        }

        .test-instructions ul {
            list-style-position: inside;
            color: #666;
        }

        .test-instructions li {
            margin-bottom: 10px;
        }

        .btn-start {
            background: linear-gradient(135deg, #27ae60 0%, #229954 100%);
            color: white;
            padding: 18px 50px;
            font-size: 1.2em;
        }

        .btn-start:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(39, 174, 96, 0.4);
        }

        @media (max-width: 768px) {
            .test-header h1 {
                font-size: 1.8em;
            }

            .question-card {
                padding: 25px;
            }

            .question-text {
                font-size: 1.05em;
            }

            .modal-content {
                padding: 25px;
            }

            .score-display {
                font-size: 3em;
            }
        }