:root {
            --walmart-blue: #0071ce;
            --walmart-yellow: #ffc220;
            --light-gray: #f5f5f5;
            --medium-gray: #e0e0e0;
            --dark-gray: #333333;
            --success-color: #4caf50;
            --error-color: #f44336;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        
        body {
            line-height: 1.6;
            color: var(--dark-gray);
            background-color: #f8f9fa;
        }
        
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 头部样式 */
        header {
            background-color: white;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .logo-img {
            height: 40px;
            width: auto;
        }
        
        .logo-text {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--walmart-blue);
        }
        
        .logo-text span {
            color: var(--walmart-yellow);
        }
        
        /* 主要内容区域 */
        .main-content {
            padding: 40px 0;
            min-height: calc(100vh - 300px);
        }
        
        .hero {
            background: linear-gradient(135deg, var(--walmart-blue) 0%, #005ba1 100%);
            color: white;
            border-radius: 12px;
            padding: 40px;
            margin-bottom: 40px;
            text-align: center;
        }
        
        .hero h1 {
            font-size: 2.2rem;
            margin-bottom: 15px;
            line-height: 1.3;
        }
        
        .hero p {
            font-size: 1.1rem;
            max-width: 700px;
            margin: 0 auto 30px;
            opacity: 0.9;
        }
        
        /* 查询表单 */
        .query-section {
            background-color: white;
            border-radius: 12px;
            padding: 40px;
            box-shadow: 0 5px 20px rgba(0,0,0,0.05);
            margin-bottom: 40px;
        }
        
        .section-title {
            font-size: 1.8rem;
            color: var(--dark-gray);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .section-title i {
            color: var(--walmart-blue);
        }
        
        .section-subtitle {
            color: #666;
            margin-bottom: 30px;
            font-size: 1rem;
        }
        
        .query-form {
            max-width: 600px;
            margin: 0 auto;
        }
        
        .form-group {
            margin-bottom: 25px;
        }
        
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--dark-gray);
        }
        
        .form-input {
            width: 100%;
            padding: 15px;
            border: 2px solid var(--medium-gray);
            border-radius: 8px;
            font-size: 1rem;
            transition: border-color 0.3s;
        }
        
        .form-input:focus {
            border-color: var(--walmart-blue);
            outline: none;
        }
        
        .form-input.error {
            border-color: var(--error-color);
        }
        
        .form-hint {
            font-size: 0.9rem;
            color: #777;
            margin-top: 5px;
        }
        
        .submit-btn {
            background-color: var(--walmart-blue);
            color: white;
            border: none;
            border-radius: 8px;
            padding: 16px 30px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            width: 100%;
            transition: background-color 0.3s;
        }
        
        .submit-btn:hover {
            background-color: #005ba1;
        }
        
        .submit-btn:disabled {
            background-color: #ccc;
            cursor: not-allowed;
        }
        
        /* 结果展示 */
        .result-section {
            background-color: white;
            border-radius: 12px;
            padding: 30px;
            margin-top: 30px;
            box-shadow: 0 5px 20px rgba(0,0,0,0.05);
            display: none;
        }
        
        .result-section.active {
            display: block;
        }
        
        .result-title {
            font-size: 1.5rem;
            color: var(--dark-gray);
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .result-content {
            display: flex;
            flex-wrap: wrap;
            gap: 30px;
            align-items: center;
        }
        
        .balance-display {
            flex: 1;
            min-width: 250px;
        }
        
        .balance-label {
            font-size: 1rem;
            color: #777;
            margin-bottom: 5px;
        }
        
        .balance-amount {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--success-color);
        }
        
        .card-info {
            flex: 1;
            min-width: 250px;
        }
        
        .info-row {
            display: flex;
            justify-content: space-between;
            padding: 10px 0;
            border-bottom: 1px solid var(--light-gray);
        }
        
        .info-label {
            color: #777;
        }
        
        .info-value {
            font-weight: 600;
        }
        
        /* 信息区域 */
        .info-section {
            margin-bottom: 40px;
        }
        
        .info-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin-top: 20px;
        }
        
        .info-card {
            background-color: white;
            border-radius: 10px;
            padding: 25px;
            box-shadow: 0 3px 15px rgba(0,0,0,0.05);
        }
        
        .info-card h3 {
            color: var(--walmart-blue);
            margin-bottom: 15px;
            font-size: 1.3rem;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .info-card ul {
            padding-left: 20px;
        }
        
        .info-card li {
            margin-bottom: 8px;
        }
        
        /* FAQ区域 */
        .faq-section {
            margin-bottom: 40px;
        }
        
        .faq-item {
            background-color: white;
            border-radius: 10px;
            margin-bottom: 15px;
            overflow: hidden;
            box-shadow: 0 3px 10px rgba(0,0,0,0.05);
        }
        
        .faq-question {
            padding: 20px;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .faq-question:hover {
            background-color: #f9f9f9;
        }
        
        .faq-answer {
            padding: 0 20px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
        }
        
        .faq-item.active .faq-answer {
            padding: 0 20px 20px;
            max-height: 300px;
        }
        
        /* 底部 */
        footer {
            background-color: var(--dark-gray);
            color: white;
            padding: 40px 0 20px;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            margin-bottom: 30px;
        }
        
        .footer-column h3 {
            font-size: 1.2rem;
            margin-bottom: 20px;
            color: var(--walmart-yellow);
        }
        
        .footer-column ul {
            list-style: none;
        }
        
        .footer-column li {
            margin-bottom: 10px;
        }
        
        .footer-column a {
            color: #ddd;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-column a:hover {
            color: white;
        }
        
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #444;
            color: #aaa;
            font-size: 0.9rem;
        }
        
        /* 面包屑导航 */
        .breadcrumb {
            padding: 15px 0;
            font-size: 0.9rem;
            color: #666;
        }
        
        .breadcrumb a {
            color: var(--walmart-blue);
            text-decoration: none;
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .hero {
                padding: 30px 20px;
            }
            
            .hero h1 {
                font-size: 1.8rem;
            }
            
            .query-section {
                padding: 30px 20px;
            }
            
            .section-title {
                font-size: 1.5rem;
            }
            
            .info-grid {
                grid-template-columns: 1fr;
            }
            
            .header-container {
                flex-direction: column;
                gap: 15px;
            }
        }
        
        @media (max-width: 480px) {
            .hero h1 {
                font-size: 1.5rem;
            }
            
            .balance-amount {
                font-size: 2rem;
            }
            
            .result-content {
                flex-direction: column;
                align-items: flex-start;
            }
        }
        
        /* 加载动画 */
        .loader {
            display: none;
            text-align: center;
            margin: 20px 0;
        }
        
        .loader.active {
            display: block;
        }
        
        .spinner {
            border: 4px solid rgba(0, 0, 0, 0.1);
            border-radius: 50%;
            border-top: 4px solid var(--walmart-blue);
            width: 40px;
            height: 40px;
            animation: spin 1s linear infinite;
            margin: 0 auto;
        }
        
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        
        /* 工具提示 */
        .tooltip {
            position: relative;
            display: inline-block;
            color: var(--walmart-blue);
            cursor: help;
        }
        
        .tooltip .tooltip-text {
            visibility: hidden;
            width: 200px;
            background-color: var(--dark-gray);
            color: white;
            text-align: center;
            border-radius: 6px;
            padding: 10px;
            position: absolute;
            z-index: 1;
            bottom: 125%;
            left: 50%;
            margin-left: -100px;
            opacity: 0;
            transition: opacity 0.3s;
            font-size: 0.9rem;
            font-weight: normal;
        }
        
        .tooltip:hover .tooltip-text {
            visibility: visible;
            opacity: 1;
        }