* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }
        
        .header {
            background: white;
            border-radius: 20px;
            padding: 20px;
            margin-bottom: 20px;
            box-shadow: 0 10px 40px rgba(0,0,0,0.1);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        
        .logo {
            font-size: 24px;
            font-weight: bold;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        
        .btn {
            padding: 12px 24px;
            border: none;
            border-radius: 12px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.2s, box-shadow 0.2s;
        }
        
        .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 20px rgba(0,0,0,0.2);
        }
        
        .btn-primary {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
        }
        
        .btn-danger {
            background: #ef4444;
            color: white;
        }
        
        .card {
            background: white;
            border-radius: 20px;
            padding: 30px;
            margin-bottom: 20px;
            box-shadow: 0 10px 40px rgba(0,0,0,0.1);
        }
        
        .form-group {
            margin-bottom: 20px;
        }
        
        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #333;
        }
        
        input, textarea, select {
            width: 100%;
            padding: 12px;
            border: 2px solid #e5e7eb;
            border-radius: 12px;
            font-size: 16px;
            transition: border-color 0.2s;
        }
        
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: #667eea;
        }
        
        .products-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 20px;
            margin-top: 20px;
        }
        
        .product-card {
            background: #f9fafb;
            border-radius: 16px;
            padding: 20px;
            position: relative;
        }
        
        .product-title {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 8px;
        }
        
        .product-price {
            font-size: 24px;
            font-weight: bold;
            color: #667eea;
            margin: 10px 0;
        }
        
        .product-stats {
            display: flex;
            gap: 15px;
            font-size: 14px;
            color: #6b7280;
            margin: 10px 0;
        }
        
        .product-link {
            font-size: 12px;
            color: #3b82f6;
            word-break: break-all;
            margin: 10px 0;
        }
        
        .copy-btn {
            background: #10b981;
            color: white;
            padding: 8px 16px;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            font-size: 14px;
            margin-right: 10px;
        }
        
        .auth-screen {
            max-width: 400px;
            margin: 50px auto;
        }
        
        .hidden {
            display: none;
        }
        
        .success-message {
            background: #10b981;
            color: white;
            padding: 12px;
            border-radius: 12px;
            margin-bottom: 20px;
        }
        
        .error-message {
            background: #ef4444;
            color: white;
            padding: 12px;
            border-radius: 12px;
            margin-bottom: 20px;
        }
        
        @media (max-width: 768px) {
            .container {
                padding: 10px;
            }
            
            .card {
                padding: 20px;
            }
        }