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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: #f5f5f5;
            color: #333;
        }

        /* Header */
        .header {
            background-color: #2c3e50;
            color: white;
            padding: 1rem 2rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 100;
        }

        .header-title {
            font-size: 1.5rem;
            font-weight: 600;
        }

        /* Toggle Button */
        .toggle-btn {
            background-color: #34495e;
            border: none;
            color: white;
            padding: 0.75rem 1rem;
            cursor: pointer;
            border-radius: 4px;
            font-size: 1rem;
            transition: background-color 0.3s;
        }

        .toggle-btn:hover {
            background-color: #415a77;
        }

        /* Main Container */
        .container {
            display: flex;
            min-height: calc(100vh - 70px);
        }

        /* Sidebar */
        .sidebar {
            width: 280px;
            background-color: #34495e;
            color: white;
            padding: 2rem 0;
            transition: transform 0.3s ease;
            position: fixed;
            height: calc(100vh - 70px);
            overflow-y: auto;
        }

        .sidebar.hidden {
            transform: translateX(-280px);
        }

        .sidebar-section {
            margin-bottom: 2rem;
        }

        .sidebar-section-title {
            padding: 0.5rem 1.5rem;
            font-size: 0.875rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: #bdc3c7;
            font-weight: 600;
        }

        .sidebar-item {
            padding: 0.75rem 1.5rem;
            color: #ecf0f1;
            text-decoration: none;
            display: block;
            transition: background-color 0.2s, padding-left 0.2s;
        }

        .sidebar-item:hover {
            background-color: #2c3e50;
            padding-left: 2rem;
        }

        .sidebar-item.active {
            background-color: #3498db;
            border-left: 4px solid #2980b9;
        }

        /* Main Content */
        .main-content {
            flex: 1;
            padding: 2rem;
            margin-left: 280px;
            transition: margin-left 0.3s ease;
        }

        .main-content.expanded {
            margin-left: 0;
        }

        .content-wrapper {
            max-width: 900px;
            background-color: white;
            padding: 2rem;
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
        }

        /* Documentation Content Styles */
        .doc-title {
            font-size: 2rem;
            color: #2c3e50;
            margin-bottom: 1rem;
            border-bottom: 3px solid #3498db;
            padding-bottom: 0.5rem;
        }

        .doc-section {
            margin-bottom: 2rem;
        }

        .doc-section h2 {
            color: #34495e;
            font-size: 1.5rem;
            margin-bottom: 1rem;
        }

        .doc-section h3 {
            color: #546e7a;
            font-size: 1.25rem;
            margin-bottom: 0.75rem;
            margin-top: 1.5rem;
        }

        .doc-section p {
            line-height: 1.6;
            margin-bottom: 1rem;
            color: #555;
        }

        .code-block {
            background-color: #f8f9fa;
            border-left: 4px solid #3498db;
            padding: 1rem;
            margin: 1rem 0;
            border-radius: 4px;
            overflow-x: auto;
        }

        .code-block code {
            font-family: 'Courier New', monospace;
            color: #e74c3c;
        }

        .note {
            background-color: #fff3cd;
            border-left: 4px solid #ffc107;
            padding: 1rem;
            margin: 1rem 0;
            border-radius: 4px;
        }

        .tip {
            background-color: #d1ecf1;
            border-left: 4px solid #17a2b8;
            padding: 1rem;
            margin: 1rem 0;
            border-radius: 4px;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-280px);
            }

            .sidebar.visible {
                transform: translateX(0);
            }

            .main-content {
                margin-left: 0;
            }

            .content-wrapper {
                padding: 1rem;
            }
        }

        /* Scrollbar */
        .sidebar::-webkit-scrollbar {
            width: 6px;
        }

        .sidebar::-webkit-scrollbar-track {
            background: #2c3e50;
        }

        .sidebar::-webkit-scrollbar-thumb {
            background: #555;
            border-radius: 3px;
        }