* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f5f5f5;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }
        
        header {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 40px 0;
            text-align: center;
            margin-bottom: 30px;
            border-radius: 10px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }
        
        h1 {
            font-size: 2.5em;
            margin-bottom: 10px;
        }
        
        h2 {
            color: #444;
            border-bottom: 3px solid #667eea;
            padding-bottom: 10px;
            margin: 30px 0 20px 0;
        }
        
        h3 {
            color: #555;
            margin: 20px 0 10px 0;
        }
        
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }
        
        .stat-card {
            background: white;
            padding: 25px;
            border-radius: 10px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            text-align: center;
            transition: transform 0.2s;
        }
        
        .stat-card:hover {
            transform: translateY(-5px);
        }
        
        .stat-number {
            font-size: 2em;
            font-weight: bold;
            color: #667eea;
            margin-bottom: 5px;
        }
        
        .stat-label {
            color: #666;
            font-size: 0.9em;
        }
        
        .table-container {
            background: white;
            border-radius: 10px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            overflow: hidden;
            margin: 20px 0;
        }
        
        table {
            width: 100%;
            border-collapse: collapse;
        }
        
        th {
            background: #667eea;
            color: white;
            padding: 15px;
            text-align: left;
            font-weight: 600;
        }
        
        td {
            padding: 12px 15px;
            border-bottom: 1px solid #eee;
        }
        
        tbody tr:hover {
            background-color: #f8f9ff;
        }
        
        .group-size {
            background: #e3f2fd;
            color: #1976d2;
            padding: 4px 8px;
            border-radius: 15px;
            font-size: 0.8em;
            font-weight: bold;
        }
        
        .similarity {
            color: #4caf50;
            font-weight: bold;
        }
        
        .search-box {
            width: 100%;
            padding: 12px;
            font-size: 16px;
            border: 2px solid #ddd;
            border-radius: 25px;
            margin-bottom: 20px;
            background-color: white;
        }
        
        .search-box:focus {
            outline: none;
            border-color: #667eea;
            box-shadow: 0 0 10px rgba(102, 126, 234, 0.3);
        }
        
        .group-detail {
            background: white;
            margin: 20px 0;
            border-radius: 10px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            overflow: hidden;
        }
        
        .group-header {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 20px;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .group-header:hover {
            background: linear-gradient(135deg, #5a6fd8 0%, #6a4190 100%);
        }
        
        .group-content {
            padding: 20px;
            display: none;
        }
        
        .group-content.active {
            display: block;
        }
        
        .product-list {
            list-style: none;
            margin: 15px 0;
        }
        
        .product-list li {
            padding: 8px 0;
            border-bottom: 1px solid #eee;
            color: #555;
        }
        
        .product-list li:last-child {
            border-bottom: none;
        }
        
        .toggle-icon {
            font-size: 1.2em;
            transition: transform 0.3s;
        }
        
        .toggle-icon.rotated {
            transform: rotate(180deg);
        }
        
        .size-distribution {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            margin: 20px 0;
        }
        
        .size-badge {
            background: #f0f0f0;
            padding: 10px 15px;
            border-radius: 20px;
            font-size: 0.9em;
        }
        
        .navigation {
            background: white;
            padding: 15px 0;
            margin-bottom: 20px;
            border-radius: 10px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }
        
        .nav-links {
            display: flex;
            justify-content: center;
            gap: 30px;
        }
        
        .nav-links a {
            color: #667eea;
            text-decoration: none;
            font-weight: 600;
            padding: 10px 20px;
            border-radius: 25px;
            transition: all 0.3s;
        }
        
        .nav-links a:hover {
            background: #667eea;
            color: white;
        }
        
        @media (max-width: 768px) {
            .container {
                padding: 10px;
            }
            
            h1 {
                font-size: 2em;
            }
            
            .stats-grid {
                grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
                gap: 15px;
            }
            
            .nav-links {
                flex-direction: column;
                align-items: center;
                gap: 10px;
            }
        }