@import url('https://fonts.googleapis.com/css2?family=Liberation+Mono:wght@400;700&display=swap');
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Liberation Mono', monospace;
            background: #0f0f0f;
            color: #c9c9c9;
            line-height: 1.4;
            font-size: 13px;
        }
        
        /* Header Bar */
        .top-bar {
            background: #1a1a1a;
            border-bottom: 1px solid #333;
            padding: 8px 20px;
            font-size: 11px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        
        .logo {
            font-weight: bold;
            color: #fff;
        }
        
        .user-info {
            color: #888;
        }
        
        .balance {
            color: #4a9eff;
            font-weight: bold;
        }
        
        /* Navigation */
        .nav-bar {
            background: #222;
            border-bottom: 1px solid #333;
            padding: 0;
        }
        
        .nav-items {
            display: flex;
            flex-wrap: wrap;
        }
        
        .nav-item {
            padding: 12px 20px;
            border-right: 1px solid #333;
            cursor: pointer;
            transition: background 0.2s;
            font-size: 12px;
            color: #c9c9c9;
        }
        
        .nav-item:hover {
            background: #2a2a2a;
        }
        
        .nav-item.active {
            background: #1a1a1a;
            color: #fff;
        }
        
        /* Main Container */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            min-height: calc(100vh - 60px);
        }
        
        /* Sidebar */
        .sidebar {
            width: 280px;
            background: #1a1a1a;
            border-right: 1px solid #333;
            padding: 20px;
            flex-shrink: 0;
        }
        
        .sidebar-section {
            margin-bottom: 25px;
            border: 1px solid #333;
            background: #0f0f0f;
        }
        
        .sidebar-header {
            background: #222;
            padding: 8px 12px;
            font-size: 11px;
            font-weight: bold;
            color: #fff;
            border-bottom: 1px solid #333;
        }
        
        .sidebar-content {
            padding: 12px;
        }
        
        .stats-item {
            display: flex;
            justify-content: space-between;
            padding: 4px 0;
            font-size: 11px;
            border-bottom: 1px dotted #333;
        }
        
        .stats-value {
            color: #4a9eff;
        }
        
        .category-item {
            padding: 6px 0;
            font-size: 11px;
            color: #888;
            cursor: pointer;
            border-bottom: 1px dotted #222;
        }
        
        .category-item:hover {
            color: #c9c9c9;
        }
        
        .category-item:before {
            content: "→ ";
            color: #555;
        }
        
        /* Main Content */
        .main-content {
            flex: 1;
            background: #0f0f0f;
            padding: 20px;
        }
        
        .tab-content {
            display: none;
        }
        
        .tab-content.active {
            display: block;
        }
        
        /* Breadcrumb */
        .breadcrumb {
            color: #666;
            font-size: 11px;
            margin-bottom: 15px;
            padding: 8px 0;
            border-bottom: 1px solid #222;
        }
        
        .breadcrumb a {
            color: #4a9eff;
            text-decoration: none;
        }
        
        /* Product Grid */
        .product-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 15px;
            margin: 20px 0;
        }
        
        .product-card {
            background: #1a1a1a;
            border: 1px solid #333;
            padding: 15px;
            transition: all 0.2s;
            cursor: pointer;
        }
        
        .product-card:hover {
            border-color: #4a9eff;
            box-shadow: 0 0 5px rgba(74, 158, 255, 0.2);
        }
        
        .product-title {
            font-weight: bold;
            color: #fff;
            margin-bottom: 8px;
            font-size: 13px;
        }
        
        .product-meta {
            font-size: 11px;
            color: #888;
            margin-bottom: 10px;
            display: flex;
            justify-content: space-between;
        }
        
        .product-description {
            font-size: 11px;
            line-height: 1.5;
            margin-bottom: 12px;
            color: #c9c9c9;
        }
        
        .product-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 5px;
            margin-bottom: 10px;
        }
        
        .tag {
            background: #333;
            color: #c9c9c9;
            padding: 2px 6px;
            font-size: 10px;
            border-radius: 2px;
        }
        
        .product-footer {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 11px;
        }
        
        .vendor-rating {
            color: #4a9eff;
        }
        
        .price {
            color: #fff;
            font-weight: bold;
        }
        
        /* Tables */
        .data-table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
        }
        
        .data-table th,
        .data-table td {
            padding: 8px 12px;
            text-align: left;
            border-bottom: 1px solid #333;
            font-size: 11px;
        }
        
        .data-table th {
            background: #222;
            color: #fff;
            font-weight: bold;
        }
        
        .data-table tr:hover {
            background: #1a1a1a;
        }
        
        /* Buttons */
        .btn {
            background: #333;
            color: #c9c9c9;
            border: 1px solid #555;
            padding: 6px 12px;
            cursor: pointer;
            font-family: inherit;
            font-size: 11px;
            transition: all 0.2s;
            text-decoration: none;
            display: inline-block;
        }
        
        .btn:hover {
            background: #4a9eff;
            color: #fff;
            border-color: #4a9eff;
        }
        
        .btn-primary {
            background: #4a9eff;
            color: #fff;
            border-color: #4a9eff;
        }
        
        .btn-primary:hover {
            background: #357acc;
        }
        
        /* Search */
        .search-bar {
            background: #1a1a1a;
            border: 1px solid #333;
            padding: 15px;
            margin-bottom: 20px;
        }
        
        .search-input {
            width: 100%;
            background: #0f0f0f;
            border: 1px solid #333;
            color: #c9c9c9;
            padding: 8px 12px;
            font-family: inherit;
            font-size: 12px;
        }
        
        .search-input:focus {
            outline: none;
            border-color: #4a9eff;
        }
        
        .search-filters {
            display: flex;
            gap: 10px;
            margin-top: 10px;
            flex-wrap: wrap;
        }
        
        .filter-select {
            background: #333;
            border: 1px solid #555;
            color: #c9c9c9;
            padding: 6px 10px;
            font-family: inherit;
            font-size: 11px;
        }
        
        /* Profile Section */
        .profile-header {
            background: #1a1a1a;
            border: 1px solid #333;
            padding: 20px;
            margin-bottom: 20px;
        }
        
        .profile-title {
            font-size: 16px;
            color: #fff;
            margin-bottom: 10px;
        }
        
        .profile-subtitle {
            color: #888;
            font-size: 12px;
            margin-bottom: 15px;
        }
        
        .profile-stats {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 15px;
            margin-top: 15px;
        }
        
        .stat-box {
            background: #0f0f0f;
            border: 1px solid #333;
            padding: 10px;
            text-align: center;
        }
        
        .stat-value {
            font-size: 18px;
            color: #4a9eff;
            font-weight: bold;
        }
        
        .stat-label {
            font-size: 10px;
            color: #888;
            margin-top: 5px;
        }
        
        /* Messages/Reviews */
        .message-thread {
            background: #1a1a1a;
            border: 1px solid #333;
            margin-bottom: 15px;
        }
        
        .message-header {
            background: #222;
            padding: 10px;
            border-bottom: 1px solid #333;
            font-size: 11px;
        }
        
        .message-body {
            padding: 15px;
            font-size: 12px;
        }
        
        .message-footer {
            padding: 8px 15px;
            background: #0f0f0f;
            border-top: 1px solid #333;
            font-size: 10px;
            color: #666;
        }
        
        /* Footer */
        .footer {
            background: #1a1a1a;
            border-top: 1px solid #333;
            padding: 15px 20px;
            text-align: center;
            font-size: 10px;
            color: #666;
        }
        
        .footer-links {
            margin-bottom: 10px;
        }
        
        .footer-links a {
            color: #4a9eff;
            text-decoration: none;
            margin: 0 10px;
        }
        
        /* Responsive */
        @media (max-width: 768px) {
            .container {
                flex-direction: column;
            }
            
            .sidebar {
                width: 100%;
                border-right: none;
                border-bottom: 1px solid #333;
                padding: 15px;
            }
            
            .nav-items {
                flex-direction: column;
            }
            
            .nav-item {
                border-right: none;
                border-bottom: 1px solid #333;
            }
            
            .product-grid {
                grid-template-columns: 1fr;
            }
        }
        
        /* Security Warnings */
        .security-notice {
            background: #2a1a1a;
            border: 1px solid #664444;
            color: #ffcccc;
            padding: 15px;
            margin: 20px 0;
            font-size: 11px;
        }
        
        .security-notice strong {
            color: #ff6666;
        }