:root {
            --primary-color: #212529;
            --secondary-color: #495057;
            --accent-color: #6c757d;
            --safe-color: #198754;
            --danger-color: #dc3545;
            --warning-color: #ffc107;
            --info-color: #0dcaf0;
            --light-bg: #f8f9fa;
            --dark-bg: #212529;
            --border-radius: 4px;
            --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        .cyber-visualization {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -1;
            pointer-events: none;
            opacity: 0.35;
        }

        .binary-bg {
            position: absolute;
            width: 100%;
            height: 100%;
            bottom: 0;
            left: 0;
            background-size: cover;
            opacity: 0.015;
            z-index: 0;
            pointer-events: none;
            background-image: url('data:image/svg+xml;base64,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');
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
            position: relative;
            z-index: 1;
        }

        /* Cyber Design Elements */
        .cyber-accent {
            position: relative;
        }

        .cyber-accent::before {
            content: "";
            position: absolute;
            height: 2px;
            width: 60px;
            background-color: var(--secondary-color);
            bottom: -12px;
            left: 0;
        }

        .cyber-accent::after {
            content: "";
            position: absolute;
            height: 2px;
            width: 30px;
            background-color: #adb5bd;
            bottom: -12px;
            left: 70px;
        }

        .cyber-line {
            position: absolute;
            width: 1px;
            background-color: rgba(73, 80, 87, 0.1);
            z-index: 0;
        }

        .cyber-line-left {
            left: 15%;
            top: 0;
            height: 100%;
        }

        .cyber-line-right {
            right: 15%;
            top: 0;
            height: 100%;
        }

        .cyber-dots {
            position: absolute;
            top: 40px;
            right: 40px;
            width: 180px;
            height: 180px;
            z-index: 0;
            opacity: 0.08;
        }

        .cyber-dots::before {
            content: "";
            position: absolute;
            width: 100%;
            height: 100%;
            background-image: radial-gradient(var(--secondary-color) 2px, transparent 2px);
            background-size: 18px 18px;
        }

        .section-title {
            font-size: 36px;
            margin-bottom: 35px;
            color: var(--primary-color);
            position: relative;
            display: inline-block;
            z-index: 1;
        }

        .section-subtitle {
            font-size: 18px;
            color: var(--secondary-color);
            max-width: 800px;
            margin-bottom: 40px;
        }

        body {
            font-family: "Times New Roman", Times, serif;
            font-style: italic;
            line-height: 1.6;
            background-color: var(--light-bg);
            color: var(--primary-color);
        }

        .container {
            max-width: 1000px;
            margin: 0 auto;
            padding: 20px;
        }

        .quiz-header {
            text-align: center;
            margin-bottom: 30px;
            position: relative;
        }

        .quiz-title {
            font-size: 28px;
            margin-bottom: 10px;
            color: var(--primary-color);
        }

        .quiz-subtitle {
            font-size: 18px;
            color: var(--secondary-color);
            max-width: 800px;
            margin: 0 auto 20px;
        }

        .progress-container {
            width: 100%;
            height: 8px;
            background-color: #e9ecef;
            border-radius: 4px;
            margin-bottom: 20px;
            overflow: hidden;
        }

        .progress-bar {
            height: 100%;
            background-color: var(--secondary-color);
            transition: width 0.4s ease;
        }

        .quiz-card {
            background-color: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: 30px;
            margin-bottom: 20px;
            position: relative;
            overflow: hidden;
        }

        .quiz-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 5px;
            height: 100%;
            background-color: var(--secondary-color);
        }

        .question-number {
            display: inline-block;
            background-color: var(--secondary-color);
            color: white;
            width: 30px;
            height: 30px;
            border-radius: 50%;
            text-align: center;
            line-height: 30px;
            margin-right: 10px;
        }

        .question-text {
            font-size: 20px;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
        }

        .scenario-container {
            background-color: #f8f9fa;
            border: 1px solid #e9ecef;
            border-radius: var(--border-radius);
            padding: 20px;
            margin-bottom: 20px;
        }

        .scenario-image {
            width: 100%;
            max-height: 300px;
            object-fit: contain;
            border: 1px solid #dee2e6;
            margin-bottom: 15px;
        }

        .email-container {
            background-color: white;
            border: 1px solid #e0e0e0;
            border-radius: 4px;
            padding: 15px;
            margin-bottom: 15px;
            box-shadow: 0 1px 3px rgba(0,0,0,0.1);
            font-family: Arial, sans-serif;
            font-style: normal;
        }

        .email-header {
            padding-bottom: 10px;
            margin-bottom: 10px;
            border-bottom: 1px solid #eee;
        }

        .email-row {
            display: flex;
            margin-bottom: 5px;
            font-size: 14px;
        }

        .email-label {
            flex: 0 0 60px;
            font-weight: bold;
            color: #666;
        }

        .email-value {
            flex: 1;
            color: #333;
        }

        .email-body {
            font-size: 14px;
            line-height: 1.6;
            color: #333;
        }

        .options-container {
            display: grid;
            grid-template-columns: 1fr;
            gap: 10px;
            margin-bottom: 20px;
        }

        .option-btn {
            background-color: white;
            border: 1px solid #dee2e6;
            border-radius: var(--border-radius);
            padding: 15px;
            text-align: left;
            cursor: pointer;
            font-family: inherit;
            font-style: italic;
            font-size: 16px;
            transition: all 0.2s ease;
            position: relative;
            overflow: hidden;
        }

        .option-btn:hover {
            background-color: #f8f9fa;
            border-color: #c1c9d0;
        }

        .option-btn.selected {
            background-color: #e9ecef;
            border-color: var(--secondary-color);
            font-weight: bold;
        }

        .option-btn.correct {
            background-color: rgba(25, 135, 84, 0.1);
            border-color: var(--safe-color);
            color: var(--safe-color);
        }

        .option-btn.incorrect {
            background-color: rgba(220, 53, 69, 0.1);
            border-color: var(--danger-color);
            color: var(--danger-color);
        }

        .feedback-container {
            background-color: #f8f9fa;
            border-left: 4px solid var(--secondary-color);
            padding: 15px;
            margin-top: 20px;
            display: none;
        }

        .feedback-container.correct {
            border-left-color: var(--safe-color);
        }

        .feedback-container.incorrect {
            border-left-color: var(--danger-color);
        }

        .feedback-header {
            font-weight: bold;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
        }

        .feedback-header i {
            margin-right: 8px;
        }

        .feedback-text {
            line-height: 1.5;
        }

        .clue-list {
            margin: 10px 0;
            padding-left: 25px;
        }

        .clue-item {
            margin-bottom: 5px;
        }

        .action-buttons {
            display: flex;
            justify-content: space-between;
            margin-top: 20px;
        }

        .btn {
            padding: 10px 25px;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-family: inherit;
            font-style: italic;
            font-size: 16px;
            transition: all 0.2s ease;
            border: none;
        }

        .btn-primary {
            background-color: var(--secondary-color);
            color: white;
        }

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

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

        .btn-outline:hover {
            background-color: #f1f3f5;
        }

        .btn-disabled {
            background-color: #e9ecef;
            color: #868e96;
            cursor: not-allowed;
        }

        .results-container {
            text-align: center;
            padding: 30px;
        }

        .results-title {
            font-size: 28px;
            margin-bottom: 20px;
            color: var(--primary-color);
        }

        .results-score {
            font-size: 24px;
            margin-bottom: 15px;
        }

        .score-value {
            font-weight: bold;
            color: var(--secondary-color);
        }

        .results-message {
            margin-bottom: 20px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }

        .results-badge {
            width: 150px;
            height: 150px;
            margin: 0 auto 30px;
            background-color: #f8f9fa;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        }

        .results-badge i {
            font-size: 60px;
            color: var(--secondary-color);
        }

        .badge-expert {
            background-color: rgba(25, 135, 84, 0.1);
        }

        .badge-expert i {
            color: var(--safe-color);
        }

        .badge-proficient {
            background-color: rgba(13, 202, 240, 0.1);
        }

        .badge-proficient i {
            color: var(--info-color);
        }

        .badge-novice {
            background-color: rgba(255, 193, 7, 0.1);
        }

        .badge-novice i {
            color: var(--warning-color);
        }

        .badge-vulnerable {
            background-color: rgba(220, 53, 69, 0.1);
        }

        .badge-vulnerable i {
            color: var(--danger-color);
        }

        .tips-container {
            margin-top: 30px;
            text-align: left;
            background-color: white;
            border-radius: var(--border-radius);
            padding: 20px;
            box-shadow: var(--box-shadow);
        }

        .tips-heading {
            font-size: 20px;
            margin-bottom: 15px;
            color: var(--primary-color);
            position: relative;
            padding-left: 30px;
        }

        .tips-heading i {
            position: absolute;
            left: 0;
            top: 3px;
        }

        .tips-list {
            list-style-type: none;
            padding-left: 0;
        }

        .tips-item {
            padding: 10px 0;
            border-bottom: 1px solid #eee;
            position: relative;
            padding-left: 30px;
        }

        .tips-item:last-child {
            border-bottom: none;
        }

        .tips-item i {
            position: absolute;
            left: 0;
            top: 13px;
            color: var(--secondary-color);
        }
        /* Header styles */
        header {
            background-color: var(--primary-color);
            color: white;
            padding: 15px 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        header:after {
            content: "";
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(to right, transparent, rgba(255, 255, 255, 0.1), transparent);
        }

        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            font-size: 24px;
            font-weight: bold;
            display: flex;
            align-items: center;
        }

        .logo i {
            margin-right: 10px;
            color: #adb5bd;
        }

        .nav-links {
            display: flex;
            list-style: none;
        }

        .nav-links li {
            margin-left: 30px;
        }

        .nav-links a {
            color: white;
            font-weight: 500;
            position: relative;
            text-decoration: none;
        }

        .nav-links a:after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 1px;
            background-color: white;
            transition: width 0.3s;
        }

        .nav-links a:hover {
            color: white;
        }

        .nav-links a:hover:after {
            width: 100%;
        }

        .mobile-menu-btn {
            display: none;
            cursor: pointer;
            font-size: 24px;
        }
        /* Footer */
        footer {
            background-color: var(--dark-bg);
            color: white;
            padding: 60px 0 30px;
            margin-top: 60px;
        }

        .footer-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            margin-bottom: 40px;
        }

        .footer-about h3 {
            font-size: 24px;
            margin-bottom: 20px;
            color: white;
        }

        .footer-about p {
            margin-bottom: 20px;
            opacity: 0.8;
            line-height: 1.7;
        }

        .social-links {
            display: flex;
            gap: 15px;
        }

        .social-link {
            width: 40px;
            height: 40px;
            background-color: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            transition: background-color 0.3s;
        }

        .social-link:hover {
            background-color: rgba(255, 255, 255, 0.2);
            color: white;
        }

        .footer-links h3 {
            font-size: 24px;
            margin-bottom: 20px;
            color: white;
        }

        .quick-links {
            list-style: none;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 15px;
        }

        .quick-links a {
            color: rgba(255, 255, 255, 0.8);
            transition: color 0.3s;
            display: flex;
            align-items: center;
            text-decoration: none;
        }

        .quick-links a:hover {
            color: var(--accent-color);
        }

        .quick-links a i {
            margin-right: 10px;
            font-size: 14px;
        }

        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 14px;
            opacity: 0.7;
        }

        @media (max-width: 768px) {
            .container {
                padding: 15px;
            }

            .quiz-card {
                padding: 20px;
            }

            .question-text {
                font-size: 18px;
            }

            .action-buttons {
                flex-direction: column;
                gap: 10px;
            }

            .btn {
                width: 100%;
            }
            .category-tabs {
                padding-bottom: 10px;
            }

            .category-tab {
                padding: 8px 15px;
                font-size: 14px;
            }

            .mobile-menu-btn {
                display: block;
            }

            .nav-links {
                position: fixed;
                top: 70px;
                left: 0;
                width: 100%;
                flex-direction: column;
                background-color: var(--primary-color);
                padding: 20px;
                transform: translateY(-150%);
                transition: transform 0.3s;
                z-index: 1000;
            }

            .nav-links.active {
                transform: translateY(0);
            }

            .nav-links li {
                margin: 15px 0;
            }
        }