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

        html {
            scroll-behavior: smooth;
        }
        
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            line-height: 1.6;
            color: #333;
            background: #f5f5f5;
            padding: 20px;
            overflow-x: hidden;
        }

        .content-wrapper {
            display: flex;
            flex-direction: row;
            gap: 20px;
            max-width: 1400px;
            margin: 0 auto;
            align-items: flex-start;
        }

        .toc {
            width: 260px;
            flex-shrink: 0;
            background: white;
            padding: 24px 20px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.08);
            border-radius: 8px;
            align-self: flex-start;
            position: sticky;
            top: 20px;
            max-height: calc(100vh - 40px);
            overflow-y: auto;
        }

        .toc h2 {
            font-size: 1.3em;
            margin-bottom: 15px;
            color: #232f3e;
            border-bottom: 3px solid #ff9900;
            padding-bottom: 10px;
        }

        .toc ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .toc li {
            margin: 0;
        }

        .toc a {
            text-decoration: none;
            color: #0f5132;
            border-radius: 4px;
            transition: background 0.2s, color 0.2s;
        }

        .toc a:hover,
        .toc a:focus {
            background: rgba(255, 153, 0, 0.1);
            color: #ff8c00;
            outline: none;
        }

        .toc .toc-item {
            margin-bottom: 12px;
        }

        .toc .toc-item:last-child {
            margin-bottom: 0;
        }

        .toc .toc-item-header {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .toc .toc-item-header a {
            flex: 1;
            display: block;
            padding: 6px 10px;
            font-weight: 500;
        }

        .toc .toc-toggle {
            width: 28px;
            height: 28px;
            border-radius: 6px;
            border: 1px solid rgba(15, 81, 50, 0.3);
            background: rgba(15, 81, 50, 0.08);
            color: #0f5132;
            font-weight: 700;
            cursor: pointer;
            line-height: 1;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            transition: background 0.2s, border-color 0.2s;
        }

        .toc .toc-toggle:hover {
            background: rgba(255, 153, 0, 0.15);
            border-color: rgba(255, 153, 0, 0.4);
        }

        .toc .toc-sublist {
            margin: 6px 0 0 38px;
            padding: 0;
            list-style: none;
        }

        .toc .toc-sublist li {
            margin: 4px 0;
        }

        .toc .toc-level-3 a {
            padding: 4px 10px;
            font-weight: 400;
            font-size: 0.95em;
            color: #21543e;
        }

        .toc .toc-level-3 a:hover,
        .toc .toc-level-3 a:focus {
            color: #ff8c00;
        }

        .toc button {
            font-family: inherit;
        }
        
        .container {
            flex: 1;
                min-width: 0;
            background: white;
            padding: 40px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            border-radius: 8px;
            overflow-x: hidden;
        }

                .content-wrapper .container {
            margin: 0;
        }
        
        h1 {
            color: #232f3e;
            border-bottom: 4px solid #ff9900;
            padding-bottom: 15px;
            margin-bottom: 30px;
            font-size: 2.5em;
        }
        
        h2 {
            color: #232f3e;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 15px 20px;
            margin: 40px 0 20px 0;
            border-radius: 5px;
            font-size: 1.8em;
        }
        
        h3 {
            color: #ff9900;
            margin: 25px 0 15px 0;
            font-size: 1.4em;
            border-left: 4px solid #ff9900;
            padding-left: 15px;
        }
        
        h4 {
            color: #232f3e;
            margin: 20px 0 10px 0;
            font-size: 1.1em;
        }
        
        p {
            margin: 10px 0;
            color: #555;
        }
        
        ul, ol {
            margin: 10px 0 10px 30px;
        }
        
        li {
            margin: 8px 0;
            color: #555;
        }
        
        pre {
            background: #f4f4f4;
            border: 1px solid #ddd;
            border-left: 4px solid #ff9900;
            padding: 15px;
            overflow-x: auto;
            max-width: 100%;
            margin: 15px 0;
            border-radius: 4px;
            font-size: 0.9em;
        }
        
        code {
            background: #f4f4f4;
            padding: 2px 6px;
            border-radius: 3px;
            font-family: 'Courier New', monospace;
            font-size: 0.9em;
        }
        
        pre code {
            background: none;
            padding: 0;
        }
        
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
            display: table;
                table-layout: auto;
        }
        
        th {
            background: #232f3e;
            color: white;
            padding: 12px;
            text-align: left;
            font-weight: 600;
        }
        
        td {
            padding: 12px;
            border-bottom: 1px solid #ddd;
        }
        
        tr:nth-child(even) {
            background: #f9f9f9;
        }
        
        tr:hover {
            background: #f0f0f0;
        }

        @media (max-width: 992px) {
            .content-wrapper {
                flex-direction: column;
            }

            .toc {
                position: static;
                width: 100%;
                max-height: none;
                order: -1;
            }
        }
        
        .tier-badge {
            display: inline-block;
            padding: 5px 15px;
            border-radius: 20px;
            font-weight: bold;
            margin: 10px 0;
        }
        
        .tier-1 {
            background: #e74c3c;
            color: white;
        }
        
        .tier-2 {
            background: #f39c12;
            color: white;
        }
        
        .tier-3 {
            background: #3498db;
            color: white;
        }
        
        .highlight-box {
            background: #fff3cd;
            border-left: 4px solid #ffc107;
            padding: 15px;
            margin: 20px 0;
            border-radius: 4px;
        }
        
        .success-box {
            background: #d4edda;
            border-left: 4px solid #28a745;
            padding: 15px;
            margin: 20px 0;
            border-radius: 4px;
        }
        
        .info-box {
            background: #d1ecf1;
            border-left: 4px solid #17a2b8;
            padding: 15px;
            margin: 20px 0;
            border-radius: 4px;
            overflow-x: auto;
        }
        
        hr {
            border: none;
            border-top: 2px solid #eee;
            margin: 30px 0;
        }
        
        strong {
            color: #232f3e;
        }
        
        
        /* NEW STYLES FOR ENHANCED ELEMENTS */
        .executive-summary {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 30px;
            margin: 30px 0;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
        }
        
        .executive-summary h2 {
            background: none;
            color: white;
            padding: 0;
            margin: 0 0 20px 0;
            border-bottom: 2px solid rgba(255,255,255,0.3);
            padding-bottom: 10px;
        }
        
        .executive-summary .summary-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin-top: 20px;
        }
        
        .executive-summary .summary-card {
            background: rgba(255,255,255,0.1);
            padding: 20px;
            border-radius: 8px;
            border: 1px solid rgba(255,255,255,0.2);
        }
        
        .executive-summary .summary-card h3 {
            color: #ffd700;
            border: none;
            padding: 0;
            margin: 0 0 10px 0;
            font-size: 1.1em;
        }
        
        .executive-summary ul {
            margin: 10px 0 0 20px;
        }
        
        .executive-summary li {
            color: rgba(255,255,255,0.9);
            margin: 5px 0;
        }
        
        .nav-hub {
            background: #f8f9fa;
            padding: 25px;
            margin: 30px 0;
            border-radius: 8px;
            border: 2px solid #dee2e6;
        }
        
        .nav-hub h2 {
            background: none;
            color: #232f3e;
            padding: 0;
            margin: 0 0 20px 0;
            font-size: 1.8em;
        }
        
        .progress-tracker {
            background: white;
            padding: 20px;
            border-radius: 8px;
            margin: 20px 0;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }
        
        .progress-bar-container {
            background: #e9ecef;
            height: 30px;
            border-radius: 15px;
            overflow: hidden;
            margin: 15px 0;
        }
        
        .progress-bar {
            background: linear-gradient(90deg, #28a745 0%, #20c997 100%);
            height: 100%;
            width: 0%;
            transition: width 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: bold;
        }
        
        .topic-checklist {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 10px;
            margin: 20px 0;
        }
        
        .topic-item {
            display: flex;
            align-items: center;
            padding: 10px;
            background: white;
            border-radius: 5px;
            border: 1px solid #dee2e6;
            transition: all 0.2s;
        }
        
        .topic-item:hover {
            background: #f8f9fa;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }
        
        .topic-item input[type="checkbox"] {
            width: 20px;
            height: 20px;
            margin-right: 10px;
            cursor: pointer;
        }
        
        .topic-item label {
            cursor: pointer;
            flex: 1;
        }
        
        .topic-item.completed {
            background: #d4edda;
            border-color: #28a745;
        }
        
        .service-card {
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            padding: 25px;
            margin: 30px 0;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        
        .service-card h2 {
            background: none;
            color: #232f3e;
            padding: 0;
            margin: 0 0 20px 0;
        }
        
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 15px;
            margin-top: 20px;
        }
        
        .card-item {
            background: white;
            padding: 15px;
            border-radius: 8px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }
        
        .card-item h4 {
            color: #ff9900;
            margin: 0 0 10px 0;
            font-size: 1em;
        }
        
        .card-item p, .card-item ul {
            margin: 5px 0;
            font-size: 0.95em;
        }
        
        .card-item ul {
            margin-left: 20px;
        }
        
        .mental-model-box {
            background: #e3f2fd;
            border-left: 5px solid #2196f3;
            padding: 20px;
            margin: 25px 0;
            border-radius: 5px;
            overflow-x: auto;
        }
        
        .mental-model-box h3 {
            color: #1976d2;
            border: none;
            padding: 0;
            margin: 0 0 15px 0;
        }
        
        .ascii-diagram {
            background: #263238;
            color: #aed581;
            border: none;
            border-left: 5px solid #2196f3;
            font-family: 'Courier New', monospace;
            font-size: 0.85em;
            line-height: 1.4;
            overflow-x: auto;
                max-width: 100%;
        }
        
        .analogy {
            background: rgba(255,255,255,0.7);
            padding: 15px;
            margin-top: 15px;
            border-radius: 5px;
            border: 1px solid rgba(33,150,243,0.3);
        }
        
        .analogy h4 {
            color: #1976d2;
            margin: 0 0 10px 0;
        }
        
        .mnemonic-box {
            background: #fff3e0;
            border-left: 5px solid #ff9800;
            padding: 20px;
            margin: 25px 0;
            border-radius: 5px;
        }
        
        .mnemonic-box h3, .mnemonic-box h4 {
            color: #e65100;
            border: none;
            padding: 0;
            margin: 0 0 15px 0;
        }
        
        .mnemonic-box h4 {
            margin-top: 20px;
            font-size: 1.1em;
        }
        
        .mnemonic-box ul li {
            font-family: 'Courier New', monospace;
            font-weight: 600;
            color: #d84315;
        }
        
        .mistake-box {
            background: #ffebee;
            border-left: 5px solid #f44336;
            padding: 20px;
            margin: 25px 0;
            border-radius: 5px;
            overflow-x: auto;
        }
        
        .mistake-box.critical {
            border-left-width: 8px;
            box-shadow: 0 3px 10px rgba(244,67,54,0.2);
        }
        
        .mistake-box h3 {
            color: #c62828;
            border: none;
            padding: 0;
            margin: 0 0 15px 0;
        }
        
        .mistake-box table th {
            background: #f44336;
        }
        
        .integration-patterns {
            background: #f3e5f5;
            border-left: 5px solid #9c27b0;
            padding: 20px;
            margin: 25px 0;
            border-radius: 5px;
            overflow-x: auto;
        }
        
        .integration-patterns h3, .integration-patterns h4 {
            color: #6a1b9a;
            border: none;
            padding: 0;
        }
        
        .integration-patterns h3 {
            margin: 0 0 20px 0;
        }
        
        .integration-patterns h4 {
            margin: 20px 0 10px 0;
            font-size: 1.1em;
        }
        
        .architecture-diagram {
            background: #263238;
            color: #80cbc4;
            border: none;
            border-left: 5px solid #9c27b0;
            font-family: 'Courier New', monospace;
            font-size: 0.85em;
            line-height: 1.6;
            overflow-x: auto;
                max-width: 100%;
        }
        
        .self-check {
            background: #e8f5e9;
            border: 2px solid #4caf50;
            padding: 25px;
            margin: 30px 0;
            border-radius: 8px;
        }
        
        .self-check h3 {
            color: #2e7d32;
            border: none;
            padding: 0;
            margin: 0 0 20px 0;
        }
        
        .question {
            background: white;
            padding: 20px;
            margin: 20px 0;
            border-radius: 8px;
            border-left: 5px solid #4caf50;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }
        
        .question h4 {
            color: #2e7d32;
            margin: 0 0 10px 0;
        }
        
        .question p {
            margin: 10px 0;
            line-height: 1.8;
        }
        
        .question details {
            margin-top: 15px;
        }
        
        .question summary {
            cursor: pointer;
            padding: 10px 15px;
            background: #4caf50;
            color: white;
            border-radius: 5px;
            font-weight: bold;
            user-select: none;
            transition: background 0.2s;
        }
        
        .question summary:hover {
            background: #45a049;
        }
        
        .question .answer {
            padding: 20px;
            margin-top: 10px;
            background: #f1f8e9;
            border-radius: 5px;
        }
        
        .question .answer h5 {
            color: #2e7d32;
            margin: 15px 0 10px 0;
        }
        
        .exam-notes-box {
            background: #fff9c4;
            border: 3px solid #fbc02d;
            padding: 25px;
            margin: 30px 0;
            border-radius: 8px;
            box-shadow: 0 3px 10px rgba(251,192,45,0.3);
            overflow-x: auto;
        }
        
        .exam-notes-box h3 {
            color: #f57f17;
            border: none;
            padding: 0;
            margin: 0 0 20px 0;
        }
        
        .exam-notes-box h4 {
            color: #f57f17;
            margin: 20px 0 10px 0;
            border-bottom: 2px solid #fdd835;
            padding-bottom: 5px;
        }
        
        .red-flag-box {
            background: #ffcdd2;
            border: 3px solid #e53935;
            padding: 20px;
            margin: 20px 0;
            border-radius: 8px;
        }
        
        .red-flag-box h4 {
            color: #b71c1c;
            margin: 0 0 15px 0;
        }
        
        .comparison-matrix {
            background: #e1f5fe;
            border-left: 5px solid #0288d1;
            padding: 25px;
            margin: 30px 0;
            border-radius: 8px;
            overflow-x: auto;
        }
        
        .comparison-matrix h3 {
            color: #01579b;
            border: none;
            padding: 0;
            margin: 0 0 20px 0;
        }
        
        .decision-tree {
            background: #f3e5f5;
            padding: 20px;
            margin: 20px 0;
            border-radius: 8px;
            border: 2px solid #9c27b0;
        }
        
        .decision-tree pre {
            background: #263238;
            color: #ce93d8;
            border-left: 5px solid #9c27b0;
        }
        
        @media print {
            .nav-hub, .progress-tracker, .question details {
                display: none;
            }
            
            body {
                background: white;
            }
            
            .container {
                box-shadow: none;
            }
        }

                @media (max-width: 1024px) {
                    .content-wrapper {
                        flex-direction: column;
                    }
        
                    .toc {
                        width: 100%;
                        position: static;
                        max-height: none;
                    }
        
                    body {
                        padding: 10px;
                    }
        
                    .container {
                        padding: 20px;
                    }
                }
        
                @media (max-width: 768px) {
                    h1 {
                        font-size: 1.8em;
                    }
        
                    h2 {
                        font-size: 1.4em;
                        padding: 12px 15px;
                    }
        
                    h3 {
                        font-size: 1.2em;
                    }
        
                    .summary-grid {
                        grid-template-columns: 1fr;
                    }
        
                    table {
                        font-size: 0.85em;
                    }
        
                    th,
                    td {
                        padding: 8px;
                    }
                }