:root {
          --primary-color: #4361ee;
          --secondary-color: #f8f9fa;
          --text-color: #333;
          --border-color: #ddd;
          --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background-color: #f5f7fa;
            color: var(--text-color);
            padding: 20px;
        }
        
        header {
            text-align: center;
            margin-bottom: 30px;
        }
        
        h1, h2 {
            color: var(--primary-color);
            font-weight: 500;
            margin-bottom: 10px;
        }
        
        h2 {
            margin-top: 30px;
            font-size: 1.5rem;
            padding-bottom: 10px;
            border-bottom: 1px solid var(--border-color);
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background: white;
            border-radius: 10px;
            box-shadow: var(--shadow);
            padding: 30px;
        }
        
        .filter-section {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            margin-bottom: 30px;
            padding-bottom: 20px;
            border-bottom: 1px solid var(--border-color);
        }
        
        .filter-group {
            flex: 1;
            min-width: 200px;
        }
        
        label {
            display: block;
            margin-bottom: 5px;
            font-weight: 500;
            color: #555;
        }
        
        select, input {
            width: 100%;
            padding: 10px;
            border: 1px solid var(--border-color);
            border-radius: 5px;
            outline: none;
            transition: border 0.3s;
        }
        
        select:focus, input:focus {
            border-color: var(--primary-color);
        }
        
        .button-container {
            display: flex;
            justify-content: space-between;
            margin-bottom: 20px;
        }
        
        button {
            padding: 10px 16px;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            transition: all 0.3s;
            font-weight: 500;
        }
        
        .filter-button {
            background-color: var(--primary-color);
            color: white;
        }
        
        .download-button {
            background-color: #198754;
            color: white;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        button:hover {
            opacity: 0.9;
            transform: translateY(-1px);
        }
        
        .table-container {
            overflow-x: auto;
            margin-bottom: 30px;
        }
        
        table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 20px;
        }
        
        th, td {
            padding: 12px 15px;
            text-align: left;
            border-bottom: 1px solid var(--border-color);
        }
        
        th {
            background-color: var(--secondary-color);
            color: #555;
            font-weight: 500;
        }
        
        tr:hover {
            background-color: rgba(67, 97, 238, 0.05);
        }
        
        .empty-message {
            text-align: center;
            padding: 20px;
            color: #777;
        }
        
        .summary-table th, .summary-table td {
            text-align: center;
        }
        
        .summary-table tbody tr:last-child {
            font-weight: 500;
        }
        
        .summary-section {
            margin-top: 40px;
            padding-top: 20px;
            border-top: 1px solid var(--border-color);
        }
        
        .loading {
            text-align: center;
            padding: 20px;
            display: none;
        }
        
        .spinner {
            border: 4px solid rgba(0, 0, 0, 0.1);
            width: 36px;
            height: 36px;
            border-radius: 50%;
            border-left-color: var(--primary-color);
            animation: spin 1s linear infinite;
            display: inline-block;
            vertical-align: middle;
            margin-right: 10px;
        }
        
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        
        @media (max-width: 768px) {
            .filter-section {
                flex-direction: column;
            }
            
            .filter-group {
                width: 100%;
            }
        }