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

        :root {
            --bg-primary: #0a0a0a;
            --bg-secondary: #1a1a1a;
            --bg-tertiary: #2a2a2a;
            --text-primary: #e0e0e0;
            --text-secondary: #b0b0b0;
            --accent: #4a9eff;
            --border: #333;
            --hover: #3a3a3a;
            --success: #2ecc71;
            --error: #e74c3c;
            --warning: #f39c12;
        }

        body {
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            background: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.6;
            overflow-x: hidden;
        }

        .container {
            display: flex;
            min-height: 100vh;
        }

        /* Sidebar Navigation */
        .sidebar {
            width: 280px;
            background: var(--bg-secondary);
            border-right: 1px solid var(--border);
            padding: 20px 0;
            position: fixed;
            height: 100vh;
            overflow-y: auto;
            z-index: 100;
        }

        .logo {
            padding: 0 20px 30px;
            border-bottom: 1px solid var(--border);
            margin-bottom: 20px;
        }

        .logo h1 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 5px;
        }

        .logo p {
            font-size: 12px;
            color: var(--text-secondary);
        }

        .nav-item {
            padding: 12px 20px;
            cursor: pointer;
            transition: all 0.3s ease;
            border-left: 3px solid transparent;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .nav-item:hover {
            background: var(--hover);
            border-left-color: var(--accent);
        }

        .nav-item.active {
            background: var(--bg-tertiary);
            border-left-color: var(--accent);
            color: var(--accent);
        }

        .nav-item .icon {
            font-size: 14px;
            width: 16px;
        }

        /* Main Content */
        .main-content {
            flex: 1;
            margin-left: 280px;
            padding: 40px;
            max-width: calc(100vw - 280px);
        }

        .section {
            display: none;
            animation: fadeIn 0.5s ease;
        }

        .section.active {
            display: block;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .section-header {
            margin-bottom: 30px;
        }

        .section-header h2 {
            font-size: 28px;
            font-weight: 600;
            margin-bottom: 10px;
            color: var(--text-primary);
        }

        .section-header p {
            color: var(--text-secondary);
            font-size: 14px;
        }

        /* API Cards */
        .api-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 20px;
            margin-bottom: 40px;
        }

        .api-card {
            background: var(--bg-secondary);
            border: 1px solid var(--border);
            border-radius: 8px;
            padding: 24px;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .api-card:hover {
            transform: translateY(-2px);
            border-color: var(--accent);
            box-shadow: 0 4px 12px rgba(74, 158, 255, 0.1);
        }

        .api-card h3 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 12px;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .api-card p {
            color: var(--text-secondary);
            font-size: 14px;
            margin-bottom: 16px;
            line-height: 1.5;
        }

        .api-card .endpoint {
            font-family: 'Courier New', monospace;
            font-size: 12px;
            color: var(--accent);
            background: var(--bg-tertiary);
            padding: 8px 12px;
            border-radius: 4px;
            margin-bottom: 16px;
            word-break: break-all;
        }

        .api-card .method {
            display: inline-block;
            background: var(--accent);
            color: white;
            padding: 2px 8px;
            border-radius: 3px;
            font-size: 10px;
            font-weight: 600;
            text-transform: uppercase;
            margin-right: 8px;
        }

        /* Form Elements */
        .form-group {
            margin-bottom: 16px;
        }

        .form-group label {
            display: block;
            margin-bottom: 6px;
            font-size: 13px;
            color: var(--text-secondary);
            font-weight: 500;
        }

        .form-group input,
        .form-group select,
        .form-group textarea {
            width: 100%;
            padding: 10px 12px;
            background: var(--bg-tertiary);
            border: 1px solid var(--border);
            border-radius: 4px;
            color: var(--text-primary);
            font-size: 14px;
            transition: border-color 0.3s ease;
        }

        .form-group input:focus,
        .form-group select:focus,
        .form-group textarea:focus {
            outline: none;
            border-color: var(--accent);
        }

        .btn {
            background: var(--accent);
            color: white;
            border: none;
            padding: 10px 20px;
            border-radius: 4px;
            cursor: pointer;
            font-size: 14px;
            font-weight: 500;
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .btn:hover {
            background: #3a8ee6;
            transform: translateY(-1px);
        }

        .btn:disabled {
            background: var(--text-secondary);
            cursor: not-allowed;
            transform: none;
        }

        /* Loading States */
        .loading {
            position: relative;
            pointer-events: none;
        }

        .loading::after {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 20px;
            height: 20px;
            margin: -10px 0 0 -10px;
            border: 2px solid var(--accent);
            border-radius: 50%;
            border-top-color: transparent;
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        /* Response Display */
        .response {
            margin-top: 16px;
            background: var(--bg-tertiary);
            border: 1px solid var(--border);
            border-radius: 4px;
            padding: 16px;
            max-height: 400px;
            overflow-y: auto;
        }

        .response pre {
            font-family: 'Courier New', monospace;
            font-size: 12px;
            line-height: 1.4;
            white-space: pre-wrap;
            word-break: break-word;
            margin: 0;
            color: var(--text-primary);
        }

        .response.success {
            border-left: 4px solid var(--success);
        }

        .response.error {
            border-left: 4px solid var(--error);
        }

        /* Status Indicators */
        .status {
            position: absolute;
            top: 8px;
            right: 8px;
            padding: 4px 8px;
            border-radius: 3px;
            font-size: 11px;
            font-weight: 600;
        }

        .status.success {
            background: var(--success);
            color: white;
        }

        .status.error {
            background: var(--error);
            color: white;
        }

        .status.loading {
            background: var(--warning);
            color: white;
        }

        /* Mobile Responsive */
        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
                transition: transform 0.3s ease;
            }

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

            .main-content {
                margin-left: 0;
                padding: 20px;
                max-width: 100vw;
            }

            .api-grid {
                grid-template-columns: 1fr;
            }

            .mobile-menu-btn {
                display: block;
                position: fixed;
                top: 20px;
                left: 20px;
                z-index: 1000;
                background: var(--accent);
                color: white;
                border: none;
                padding: 8px 12px;
                border-radius: 4px;
                cursor: pointer;
            }
        }

        .mobile-menu-btn {
            display: none;
        }

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

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

        ::-webkit-scrollbar-thumb {
            background: var(--border);
            border-radius: 3px;
        }

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