:root {
            /* Colors */
            --primary-color: #fd3132;
            --primary-hover: #d50404;
            --primary-light: rgba(253, 49, 50, 0.1);
            --secondary-color: #2a3d66;
            --secondary-hover: #16274b;
            --secondary-light: rgba(42, 61, 102, 0.1);
            --text-color: #333333;
            --text-light: #666666;
            --white: #ffffff;
            --light-gray: #f8f9fa;
            --mid-gray: #e9ecef;
            --dark-gray: #adb5bd;
            --success-color: #10B981;
            --error-color: #EF4444;
            --warning-color: #F59E0B;
            --info-color: #06B6D4;
            
            /* Typography */
            --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            --border-radius: 8px;
            --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.12);
        }

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

        body {
            font-family: var(--font-family);
            background: var(--light-gray);
            color: var(--text-color);
            min-height: 100vh;
        }

        /* Navbar */
        .navbar-custom {
            background: var(--white);
            box-shadow: var(--shadow);
            padding: 0.75rem 0;
        }

        .navbar-brand {
            font-weight: 700;
            color: var(--primary-color) !important;
            font-size: 1.5rem;
        }

        .nav-link {
            color: var(--text-color) !important;
            font-weight: 500;
            padding: 0.5rem 1rem !important;
            border-radius: var(--border-radius);
            transition: all 0.3s ease;
            margin: 0 0.25rem;
        }

        .nav-link:hover {
            background: var(--primary-light);
            color: var(--primary-color) !important;
        }

        .nav-link.active {
            background: var(--primary-color);
            color: var(--white) !important;
        }

        .btn-nav {
            padding: 0.5rem 1rem;
            border-radius: var(--border-radius);
            font-weight: 500;
            margin: 0 0.25rem;
            border: none;
            transition: all 0.3s ease;
        }

        .btn-nav.btn-outline-primary {
            border: 1px solid var(--primary-color);
            color: var(--primary-color);
        }

        .btn-nav.btn-outline-primary:hover {
            background: var(--primary-color);
            color: var(--white);
        }

        .btn-nav.btn-outline-secondary {
            border: 1px solid var(--secondary-color);
            color: var(--secondary-color);
        }

        .btn-nav.btn-outline-secondary:hover {
            background: var(--secondary-color);
            color: var(--white);
        }

        /* Loading Screen */
        .loading-container {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            min-height: 60vh;
            text-align: center;
        }

        .loading-spinner {
            width: 50px;
            height: 50px;
            border: 3px solid var(--mid-gray);
            border-top: 3px solid var(--primary-color);
            border-radius: 50%;
            animation: spin 1s linear infinite;
            margin-bottom: 1rem;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        /* Main Score Display */
        .score-overview {
            background: var(--white);
            border-radius: var(--border-radius);
            padding: 2rem;
            margin: 1rem;
            box-shadow: var(--shadow-lg);
        }

        .score-highlights {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            margin: 0 auto;
        }

        .score-main {
            text-align: center;
            padding: 2rem 1.5rem;
            background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
            color: var(--white);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-lg);
        }

        .score-main .score-number {
            font-size: 3.5rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            text-shadow: 0 2px 4px rgba(0,0,0,0.1);
        }

        .score-main .score-label {
            font-size: 1.1rem;
            opacity: 0.95;
            margin-bottom: 0.5rem;
            font-weight: 500;
        }

        .score-main .score-subtitle {
            font-size: 0.9rem;
            opacity: 0.85;
            font-weight: 400;
        }

        .band-score {
            text-align: center;
            padding: 2rem 1.5rem;
            background: linear-gradient(135deg, var(--secondary-color), var(--secondary-hover));
            color: var(--white);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-lg);
            position: relative;
        }

        .band-score::before {
            content: '';
            position: absolute;
            top: -2px;
            left: -2px;
            right: -2px;
            bottom: -2px;
            background: linear-gradient(135deg, #FFD700, #FFA500);
            border-radius: var(--border-radius);
            z-index: -1;
        }

        .band-score .band-number {
            font-size: 3.5rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            text-shadow: 0 2px 4px rgba(0,0,0,0.1);
        }

        .band-score .band-label {
            font-size: 1.1rem;
            opacity: 0.95;
            margin-bottom: 0.5rem;
            font-weight: 500;
        }

        .band-score .band-description {
            font-size: 0.9rem;
            opacity: 0.85;
            font-weight: 400;
        }

        /* Summary Statistics - Simplified */
        .summary-stats {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 0.75rem;
            margin: 1rem;
        }

        .stat-card {
            background: var(--white);
            padding: 1rem 0.75rem;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            text-align: center;
            border-left: 3px solid var(--primary-color);
            transition: transform 0.2s ease;
        }

        .stat-card:hover {
            transform: translateY(-2px);
        }

        .stat-number {
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 0.25rem;
        }

        .stat-label {
            font-size: 0.75rem;
            color: var(--text-light);
            font-weight: 500;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        /* Performance Metrics */
        .metrics-container {
            background: var(--white);
            border-radius: var(--border-radius);
            padding: 1.5rem;
            margin: 1rem;
            box-shadow: var(--shadow);
        }

        .section-title {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            margin-bottom: 1rem;
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--secondary-color);
        }

        .section-title i {
            background: var(--primary-color);
            color: var(--white);
            padding: 0.5rem;
            border-radius: 6px;
            font-size: 0.9rem;
        }

        .metric-row {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0.75rem 0;
            border-bottom: 1px solid var(--mid-gray);
        }

        .metric-row:last-child {
            border-bottom: none;
        }

        .metric-label {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-weight: 500;
            color: var(--text-color);
            font-size: 0.9rem;
        }

        .metric-label i {
            color: var(--primary-color);
            width: 16px;
            text-align: center;
        }

        .metric-value {
            font-weight: 600;
            color: var(--secondary-color);
            font-size: 0.9rem;
        }

        /* Question Results - Grid Layout */
        .question-results {
            background: var(--white);
            border-radius: var(--border-radius);
            padding: 1.5rem;
            margin: 1rem;
            box-shadow: var(--shadow);
        }

        .questions-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 1rem;
        }

        .question-item {
            border: 2px solid var(--mid-gray);
            border-radius: var(--border-radius);
            padding: 1rem;
            transition: all 0.3s ease;
            position: relative;
            background: var(--white);
        }

        .question-item.correct {
            border-color: var(--success-color);
            background: linear-gradient(135deg, rgba(16, 185, 129, 0.03), rgba(16, 185, 129, 0.01));
        }

        .question-item.incorrect {
            border-color: var(--error-color);
            background: linear-gradient(135deg, rgba(239, 68, 68, 0.03), rgba(239, 68, 68, 0.01));
        }

        .question-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 0.75rem;
            padding-bottom: 0.5rem;
            border-bottom: 1px solid var(--mid-gray);
        }

        .question-number {
            background: var(--primary-color);
            color: var(--white);
            padding: 0.3rem 0.7rem;
            border-radius: 15px;
            font-size: 0.8rem;
            font-weight: 600;
        }

        .status-indicator {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .status-badge {
            padding: 0.25rem 0.6rem;
            border-radius: 12px;
            font-size: 0.7rem;
            font-weight: 600;
            text-transform: uppercase;
        }

        .status-badge.correct {
            background: var(--success-color);
            color: var(--white);
        }

        .status-badge.incorrect {
            background: var(--error-color);
            color: var(--white);
        }

        .status-icon {
            font-size: 1rem;
        }

        .status-icon.correct {
            color: var(--success-color);
        }

        .status-icon.incorrect {
            color: var(--error-color);
        }

        .question-text {
            margin-bottom: 0.75rem;
            line-height: 1.5;
            color: var(--text-light);
            font-size: 0.9rem;
        }

        .answer-section {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 0.75rem;
        }

        .answer-box {
            padding: 0.75rem;
            border-radius: 6px;
            border: 1px solid;
        }

        .answer-box.user-answer {
            border-color: var(--error-color);
            background: rgba(239, 68, 68, 0.03);
        }

        .answer-box.correct-answer {
            border-color: var(--success-color);
            background: rgba(16, 185, 129, 0.03);
        }

        .answer-label {
            display: flex;
            align-items: center;
            gap: 0.4rem;
            font-size: 0.75rem;
            font-weight: 600;
            text-transform: uppercase;
            margin-bottom: 0.5rem;
        }

        .answer-label.user {
            color: var(--error-color);
        }

        .answer-label.correct {
            color: var(--success-color);
        }

        .answer-text {
            font-size: 0.85rem;
            font-weight: 500;
            word-break: break-word;
        }

        .empty-answer {
            color: var(--text-light);
            font-style: italic;
        }

        /* Chart Container */
        .chart-container {
            background: var(--white);
            border-radius: var(--border-radius);
            padding: 1rem;
            height: 180px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow);
            margin: 1rem;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .score-highlights {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }

            .score-main, .band-score {
                padding: 1.5rem 1rem;
            }

            .score-main .score-number,
            .band-score .band-number {
                font-size: 2.5rem;
            }

            .summary-stats {
                grid-template-columns: repeat(2, 1fr);
                margin: 1rem 0.5rem;
            }

            .metrics-container,
            .question-results,
            .score-overview {
                margin: 1rem 0.5rem;
                padding: 1.5rem;
            }

            .questions-grid {
                grid-template-columns: 1fr;
            }

            .answer-section {
                grid-template-columns: 1fr;
            }

            /* Mobile navbar adjustments */
            .navbar-nav {
                gap: 0.5rem;
            }

            .btn-nav {
                margin: 0.25rem 0;
                width: 100%;
            }
        }

        @media (min-width: 1200px) {
            .questions-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        /* Print Styles */
        @media print {
            body {
                background: white !important;
                font-size: 11px !important;
            }
            
            .navbar-custom {
                display: none !important;
            }
            
            .metrics-container,
            .question-results,
            .score-overview,
            .summary-stats {
                box-shadow: none !important;
                border: 1px solid #ddd !important;
                margin: 0.5rem 0 !important;
                padding: 0.75rem !important;
                page-break-inside: avoid;
            }

            .score-highlights {
                grid-template-columns: 1fr 1fr;
                gap: 1rem;
            }

            .score-main, .band-score {
                padding: 1rem !important;
            }

            .score-main .score-number,
            .band-score .band-number {
                font-size: 2rem !important;
            }

            .band-score::before {
                display: none !important;
            }

            .summary-stats {
                grid-template-columns: repeat(4, 1fr);
                gap: 0.5rem;
                margin: 0.5rem 0 !important;
            }

            .stat-card {
                padding: 0.5rem !important;
            }

            .stat-number {
                font-size: 1rem !important;
            }

            .questions-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 0.5rem;
            }

            .question-item {
                padding: 0.75rem !important;
                margin-bottom: 0.5rem;
            }

            .question-text {
                font-size: 10px !important;
            }

            .answer-box {
                padding: 0.5rem !important;
            }

            .answer-text {
                font-size: 10px !important;
            }

            .section-title {
                font-size: 1rem !important;
                margin-bottom: 0.5rem !important;
            }

            .metric-row {
                padding: 0.4rem 0 !important;
            }

            .metric-label,
            .metric-value {
                font-size: 10px !important;
            }

            h1, h2, h3, h4, h5, h6 {
                page-break-after: avoid;
            }

            .question-item {
                page-break-inside: avoid;
            }
        }