:root {
            --primary: #6366f1;
            --primary-dark: #4f46e5;
            --text: #1e293b;
            --text-light: #64748b;
            --bg: #ffffff;
            --bg-alt: #f8fafc;
            --border: #e2e8f0;
            --success: #10b981;
            --warning: #f59e0b;
            --danger: #ef4444;
        }

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

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
        }

        .container {
            max-width: 900px;
            margin: 0 auto;
            padding: 40px 20px;
        }

        /* Header */
        .doc-header {
            text-align: center;
            padding: 60px 20px;
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            color: white;
            margin-bottom: 40px;
        }

        .doc-header h1 {
            font-size: 2.5rem;
            margin-bottom: 10px;
        }

        .doc-header .subtitle {
            font-size: 1.1rem;
            opacity: 0.9;
        }

        .doc-header .version {
            margin-top: 15px;
            font-size: 0.9rem;
            opacity: 0.8;
        }

        /* Print/Download Button */
        .action-bar {
            display: flex;
            justify-content: flex-end;
            gap: 10px;
            margin-bottom: 30px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 20px;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            text-decoration: none;
            transition: background 0.2s;
        }

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

        .btn-secondary {
            background: var(--bg-alt);
            color: var(--text);
            border: 1px solid var(--border);
        }

        .btn-secondary:hover {
            background: var(--border);
        }

        /* Table of Contents */
        .toc {
            background: var(--bg-alt);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 30px;
            margin-bottom: 40px;
        }

        .toc h2 {
            font-size: 1.3rem;
            margin-bottom: 20px;
            color: var(--primary);
        }

        .toc ul {
            list-style: none;
        }

        .toc li {
            margin-bottom: 10px;
        }

        .toc a {
            color: var(--text);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 8px 12px;
            border-radius: 6px;
            transition: all 0.2s;
        }

        .toc a:hover {
            background: white;
            color: var(--primary);
        }

        .toc .section-num {
            background: var(--primary);
            color: white;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 12px;
            font-weight: 600;
        }

        /* Sections */
        .section {
            margin-bottom: 50px;
            padding-bottom: 30px;
            border-bottom: 1px solid var(--border);
        }

        .section:last-child {
            border-bottom: none;
        }

        h2 {
            font-size: 1.8rem;
            color: var(--primary);
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--primary);
        }

        h3 {
            font-size: 1.3rem;
            color: var(--text);
            margin: 25px 0 15px;
        }

        h4 {
            font-size: 1.1rem;
            color: var(--text);
            margin: 20px 0 10px;
        }

        p {
            margin-bottom: 15px;
            color: var(--text-light);
        }

        ul, ol {
            margin: 15px 0 15px 25px;
            color: var(--text-light);
        }

        li {
            margin-bottom: 8px;
        }

        /* Code Blocks */
        code {
            background: var(--bg-alt);
            padding: 2px 6px;
            border-radius: 4px;
            font-family: 'Consolas', 'Monaco', monospace;
            font-size: 0.9em;
            color: var(--primary-dark);
        }

        pre {
            background: #1e293b;
            color: #e2e8f0;
            padding: 20px;
            border-radius: 8px;
            overflow-x: auto;
            margin: 15px 0;
            font-family: 'Consolas', 'Monaco', monospace;
            font-size: 13px;
            line-height: 1.5;
        }

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

        /* Tips and Notes */
        .note {
            background: #eff6ff;
            border-left: 4px solid #3b82f6;
            padding: 15px 20px;
            border-radius: 0 8px 8px 0;
            margin: 20px 0;
        }

        .note.warning {
            background: #fffbeb;
            border-color: var(--warning);
        }

        .note.success {
            background: #ecfdf5;
            border-color: var(--success);
        }

        .note-title {
            font-weight: 600;
            color: var(--text);
            margin-bottom: 5px;
        }

        .note p {
            margin: 0;
            color: var(--text);
        }

        /* Tables */
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
        }

        th, td {
            padding: 12px 15px;
            text-align: left;
            border: 1px solid var(--border);
        }

        th {
            background: var(--bg-alt);
            font-weight: 600;
            color: var(--text);
        }

        td {
            color: var(--text-light);
        }

        /* Tool Cards */
        .tool-overview {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin: 20px 0;
        }

        .tool-card {
            background: var(--bg-alt);
            border: 1px solid var(--border);
            border-radius: 10px;
            padding: 20px;
        }

        .tool-card h4 {
            margin: 0 0 10px;
            color: var(--primary);
        }

        .tool-card p {
            margin: 0;
            font-size: 14px;
        }

        /* Screenshots placeholder */
        .screenshot {
            background: var(--bg-alt);
            border: 2px dashed var(--border);
            border-radius: 8px;
            padding: 40px;
            text-align: center;
            color: var(--text-light);
            margin: 20px 0;
        }

        /* Footer */
        .doc-footer {
            text-align: center;
            padding: 40px 20px;
            background: var(--bg-alt);
            margin-top: 40px;
            color: var(--text-light);
        }

        .doc-footer a {
            color: var(--primary);
            text-decoration: none;
        }

        /* Print Styles */
        @media print {
            .action-bar {
                display: none;
            }

            .doc-header {
                background: var(--primary) !important;
                -webkit-print-color-adjust: exact;
                print-color-adjust: exact;
            }

            .section {
                page-break-inside: avoid;
            }

            pre {
                white-space: pre-wrap;
                word-wrap: break-word;
            }

            body {
                font-size: 11pt;
            }

            h2 {
                page-break-after: avoid;
            }

            .toc {
                page-break-after: always;
            }
        }

        @media (max-width: 600px) {
            .doc-header h1 {
                font-size: 1.8rem;
            }

            .container {
                padding: 20px 15px;
            }
        }