:root {
            --primary-color: #0f172a;
            --secondary-color: #0ea5e9;
            --accent-color: #06b6d4;
            --success-color: #10b981;
            --warning-color: #f59e0b;
            --danger-color: #ef4444;
            --light-bg: #f8fafc;
            --light-text: #64748b;
            --border-color: #e2e8f0;
            --card-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
            --card-shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            line-height: 1.6;
            color: #1e293b;
            background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
            min-height: 100vh;
        }

        /* ============ HEADER & NAVIGATION ============ */
        header {
            background: linear-gradient(135deg, var(--primary-color) 0%, #1e3a8a 100%);
            color: white;
            padding: 2rem;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: var(--card-shadow-lg);
        }

        header h1 {
            font-size: 1.875rem;
            margin-bottom: 0.5rem;
            font-weight: 700;
            letter-spacing: -0.5px;
        }

        header p {
            font-size: 0.95rem;
            opacity: 0.9;
            margin-bottom: 1rem;
        }

        .header-meta {
            display: flex;
            gap: 2rem;
            flex-wrap: wrap;
            font-size: 0.875rem;
            opacity: 0.85;
        }

        .header-meta span {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        /* ============ MAIN LAYOUT ============ */
        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 2rem;
            display: grid;
            grid-template-columns: 1fr 3fr;
            gap: 2rem;
        }

        @media (max-width: 1024px) {
            .container {
                grid-template-columns: 1fr;
            }
        }

        /* ============ SIDEBAR NAVIGATION ============ */
        aside {
            position: sticky;
            top: 100px;
            max-height: calc(100vh - 120px);
            overflow-y: auto;
            padding: 0;
        }

        .toc {
            background: white;
            border-radius: 12px;
            padding: 1.5rem;
            box-shadow: var(--card-shadow);
            border: 1px solid var(--border-color);
        }

        .toc h2 {
            font-size: 1rem;
            margin-bottom: 1.5rem;
            color: var(--primary-color);
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .toc ul {
            list-style: none;
        }

        .toc li {
            margin-bottom: 0.5rem;
        }

        .toc a {
            display: block;
            padding: 0.5rem 0.75rem;
            color: var(--light-text);
            text-decoration: none;
            border-left: 3px solid transparent;
            transition: var(--transition);
            font-size: 0.875rem;
            font-weight: 500;
        }

        .toc a:hover {
            color: var(--secondary-color);
            background: rgba(15, 23, 42, 0.05);
            border-left-color: var(--secondary-color);
            padding-left: 1rem;
        }

        .toc .level-2 {
            padding-left: 1.5rem;
            font-size: 0.8125rem;
            opacity: 0.8;
        }

        @media (max-width: 1024px) {
            aside {
                position: relative;
                top: 0;
                max-height: none;
            }
        }

        /* ============ MAIN CONTENT ============ */
        main {
            min-height: 100vh;
        }

        section {
            margin-bottom: 3rem;
            scroll-margin-top: 120px;
        }

        /* ============ TYPOGRAPHY ============ */
        h1 {
            font-size: 2.5rem;
            font-weight: 700;
            margin: 2.5rem 0 1rem;
            color: var(--primary-color);
            letter-spacing: -1px;
        }

        h2 {
            font-size: 2rem;
            font-weight: 700;
            margin: 2rem 0 1.5rem;
            color: var(--primary-color);
            padding-bottom: 0.75rem;
            border-bottom: 3px solid var(--secondary-color);
        }

        h3 {
            font-size: 1.5rem;
            font-weight: 600;
            margin: 1.75rem 0 1rem;
            color: #1e293b;
        }

        h4 {
            font-size: 1.25rem;
            font-weight: 600;
            margin: 1.5rem 0 0.75rem;
            color: #334155;
        }

        h5 {
            font-size: 1.125rem;
            font-weight: 600;
            margin: 1.25rem 0 0.5rem;
            color: #475569;
        }

        p {
            margin-bottom: 1rem;
            line-height: 1.8;
        }

        hr {
            margin: 2rem 0;
            border: none;
            border-top: 2px solid var(--border-color);
        }

        strong {
            font-weight: 600;
            color: var(--primary-color);
        }

        em {
            font-style: italic;
            color: var(--light-text);
        }

        /* ============ EXECUTIVE SUMMARY CARD ============ */
        .executive-summary {
            background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 100%);
            color: white;
            padding: 2.5rem;
            border-radius: 16px;
            margin-bottom: 2rem;
            box-shadow: var(--card-shadow-lg);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .executive-summary h2 {
            border-bottom-color: var(--accent-color);
            color: white;
            margin-top: 0;
        }

        .executive-summary h3 {
            color: var(--accent-color);
            font-size: 1.25rem;
            margin-top: 1.5rem;
            margin-bottom: 1rem;
        }

        .executive-summary ol {
            padding-left: 1.5rem;
            margin-bottom: 1.5rem;
        }

        .executive-summary li {
            margin-bottom: 1rem;
            line-height: 1.8;
        }

        .key-stat {
            display: inline-block;
            background: rgba(255, 255, 255, 0.1);
            padding: 0.25rem 0.75rem;
            border-radius: 4px;
            font-weight: 600;
            margin: 0 0.25rem;
        }

        /* ============ CARDS & CALLOUTS ============ */
        .card {
            background: white;
            border-radius: 12px;
            padding: 1.75rem;
            margin-bottom: 1.5rem;
            box-shadow: var(--card-shadow);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .card:hover {
            box-shadow: var(--card-shadow-lg);
            transform: translateY(-2px);
        }

        .card-metric {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1.5rem;
            margin: 1.5rem 0;
        }

        .metric {
            background: linear-gradient(135deg, var(--light-bg) 0%, #f1f5f9 100%);
            padding: 1.5rem;
            border-radius: 10px;
            border-left: 4px solid var(--secondary-color);
        }

        .metric-value {
            font-size: 2rem;
            font-weight: 700;
            color: var(--secondary-color);
            margin-bottom: 0.25rem;
        }

        .metric-label {
            font-size: 0.875rem;
            color: var(--light-text);
            font-weight: 500;
        }

        .callout {
            background: linear-gradient(135deg, rgba(6, 182, 212, 0.05) 0%, rgba(14, 165, 233, 0.05) 100%);
            border-left: 4px solid var(--accent-color);
            padding: 1.5rem;
            border-radius: 8px;
            margin: 1.5rem 0;
        }

        .callout strong {
            color: var(--accent-color);
        }

        .warning {
            background: linear-gradient(135deg, rgba(239, 68, 68, 0.05) 0%, rgba(245, 158, 11, 0.05) 100%);
            border-left-color: var(--danger-color);
        }

        .success {
            background: linear-gradient(135deg, rgba(16, 185, 129, 0.05) 0%, rgba(34, 197, 94, 0.05) 100%);
            border-left-color: var(--success-color);
        }

        /* ============ LISTS ============ */
        ol, ul {
            margin-left: 1.5rem;
            margin-bottom: 1.5rem;
        }

        li {
            margin-bottom: 0.75rem;
            line-height: 1.8;
        }

        ol > li:first-child, ul > li:first-child {
            margin-top: 0;
        }

        /* ============ TABLES ============ */
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
            background: white;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: var(--card-shadow);
            font-size: 0.9375rem;
        }

        thead {
            background: linear-gradient(135deg, var(--primary-color) 0%, #1e3a8a 100%);
            color: white;
        }

        th {
            padding: 1rem;
            text-align: left;
            font-weight: 600;
            letter-spacing: 0.5px;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        td {
            padding: 1rem;
            border: 1px solid var(--border-color);
        }

        tbody tr:nth-child(even) {
            background: rgba(15, 23, 42, 0.02);
        }

        tbody tr:hover {
            background: rgba(14, 165, 233, 0.08);
            transition: var(--transition);
        }

        /* ============ CODE BLOCKS ============ */
        code {
            font-family: 'Source Code Pro', monospace;
            font-size: 0.875rem;
            background: linear-gradient(135deg, var(--light-bg) 0%, #f1f5f9 100%);
            padding: 0.2em 0.5em;
            border-radius: 4px;
            color: #d63384;
            border: 1px solid var(--border-color);
        }

        pre {
            background: #1e293b;
            color: #e2e8f0;
            padding: 1.5rem;
            border-radius: 10px;
            overflow-x: auto;
            margin: 1.5rem 0;
            border: 1px solid #334155;
            line-height: 1.5;
        }

        pre code {
            background: transparent;
            color: inherit;
            padding: 0;
            border: none;
        }

        /* ============ BLOCKQUOTES ============ */
        blockquote {
            border-left: 4px solid var(--secondary-color);
            padding-left: 1.5rem;
            margin: 1.5rem 0;
            font-style: italic;
            color: var(--light-text);
            background: rgba(14, 165, 233, 0.05);
            padding: 1.5rem;
            border-radius: 0 8px 8px 0;
        }

        /* ============ BUTTONS & LINKS ============ */
        a {
            color: var(--secondary-color);
            text-decoration: none;
            font-weight: 500;
            transition: var(--transition);
            border-bottom: 1px solid transparent;
        }

        a:hover {
            color: var(--accent-color);
            border-bottom-color: var(--accent-color);
        }

        button, .btn {
            background: linear-gradient(135deg, var(--secondary-color) 0%, var(--accent-color) 100%);
            color: white;
            padding: 0.75rem 1.5rem;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            font-size: 0.9375rem;
            font-weight: 600;
            transition: var(--transition);
            display: inline-block;
            text-decoration: none;
        }

        button:hover, .btn:hover {
            transform: translateY(-2px);
            box-shadow: var(--card-shadow-lg);
        }

        /* ============ FOOTER ============ */
        footer {
            background: var(--primary-color);
            color: white;
            padding: 2rem;
            text-align: center;
            margin-top: 3rem;
            border-top: 1px solid var(--border-color);
        }

        footer p {
            margin-bottom: 0.5rem;
            opacity: 0.9;
        }

        footer a {
            color: var(--accent-color);
        }

        /* ============ PRINT STYLES ============ */
        @media print {
            body {
                background: white;
            }

            header {
                position: static;
                margin-bottom: 2rem;
            }

            aside {
                display: none;
            }

            .container {
                grid-template-columns: 1fr;
                max-width: 100%;
                padding: 0;
            }

            section {
                page-break-inside: avoid;
                margin-bottom: 2rem;
            }

            h1, h2 {
                page-break-after: avoid;
            }

            table {
                page-break-inside: avoid;
                margin: 1rem 0;
            }

            pre {
                page-break-inside: avoid;
            }

            .card {
                page-break-inside: avoid;
                box-shadow: none;
                border: 1px solid #ccc;
            }

            a {
                color: inherit;
                text-decoration: underline;
            }
        }

        /* ============ RESPONSIVE ============ */
        @media (max-width: 768px) {
            header h1 {
                font-size: 1.5rem;
            }

            h1 {
                font-size: 1.75rem;
            }

            h2 {
                font-size: 1.5rem;
            }

            h3 {
                font-size: 1.25rem;
            }

            .container {
                padding: 1rem;
            }

            .card {
                padding: 1.25rem;
            }

            .card-metric {
                grid-template-columns: 1fr;
            }

            .header-meta {
                gap: 1rem;
                font-size: 0.8125rem;
            }

            table {
                font-size: 0.8125rem;
            }

            th, td {
                padding: 0.75rem;
            }
        }

        /* ============ SCROLLBAR STYLING ============ */
        ::-webkit-scrollbar {
            width: 10px;
        }

        ::-webkit-scrollbar-track {
            background: var(--light-bg);
        }

        ::-webkit-scrollbar-thumb {
            background: var(--secondary-color);
            border-radius: 5px;
        }

        ::-webkit-scrollbar-thumb:hover {
            background: var(--accent-color);
        }

        /* ============ ANIMATIONS ============ */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .card, .callout {
            animation: fadeInUp 0.6s ease-out;
        }

        /* ============ UTILITY CLASSES ============ */
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border-width: 0;
        }

        .text-center {
            text-align: center;
        }

        .text-muted {
            color: var(--light-text);
        }

        .mt-1 { margin-top: 0.5rem; }
        .mt-2 { margin-top: 1rem; }
        .mt-3 { margin-top: 1.5rem; }
        .mt-4 { margin-top: 2rem; }

        .mb-1 { margin-bottom: 0.5rem; }
        .mb-2 { margin-bottom: 1rem; }
        .mb-3 { margin-bottom: 1.5rem; }
        .mb-4 { margin-bottom: 2rem; }