* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        
        body {
            background-color: #f8f9fa;
            color: #333;
            line-height: 1.6;
        }
        
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }
        
        /* 头部样式 */
        header {
            background-color: #0071ce;
            color: white;
            padding: 20px 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }
        
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        
        .logo {
            display: flex;
            align-items: center;
            gap: 15px;
        }
        
        .logo h1 {
            font-size: 1.8rem;
            font-weight: 700;
        }
        
        .logo-icon {
            font-size: 2rem;
            color: #ffc220;
        }
        
        nav ul {
            display: flex;
            list-style: none;
            gap: 25px;
        }
        
        nav a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.05rem;
            transition: color 0.3s;
        }
        
        nav a:hover {
            color: #ffc220;
        }
        
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
        }
        
        /* 主内容区域 */
        .hero {
            background: linear-gradient(135deg, #0071ce 0%, #004c91 100%);
            color: white;
            padding: 60px 0;
            text-align: center;
            border-radius: 0 0 20px 20px;
            margin-bottom: 40px;
        }
        
        .hero h2 {
            font-size: 2.5rem;
            margin-bottom: 20px;
        }
        
        .hero p {
            font-size: 1.2rem;
            max-width: 800px;
            margin: 0 auto 30px;
            opacity: 0.9;
        }
        
        /* 查询表单样式 */
        .card-checker {
            background-color: white;
            border-radius: 12px;
            padding: 40px;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
            margin-bottom: 50px;
        }
        
        .form-title {
            color: #0071ce;
            margin-bottom: 25px;
            font-size: 1.8rem;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .form-group {
            margin-bottom: 25px;
        }
        
        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #444;
        }
        
        input[type="text"] {
            width: 100%;
            padding: 15px;
            border: 2px solid #e1e5eb;
            border-radius: 8px;
            font-size: 1rem;
            transition: border-color 0.3s;
        }
        
        input[type="text"]:focus {
            border-color: #0071ce;
            outline: none;
        }
        
        .security-notice {
            background-color: #f0f7ff;
            border-left: 4px solid #0071ce;
            padding: 15px;
            margin-bottom: 25px;
            border-radius: 0 8px 8px 0;
        }
        
        .btn {
            display: inline-block;
            background-color: #0071ce;
            color: white;
            padding: 15px 30px;
            border: none;
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background-color 0.3s;
            text-decoration: none;
        }
        
        .btn:hover {
            background-color: #005ea6;
        }
        
        .btn-check {
            background-color: #ffc220;
            color: #333;
            width: 100%;
            font-size: 1.2rem;
            padding: 18px;
        }
        
        .btn-check:hover {
            background-color: #e6af1d;
        }
        
        /* 结果区域 */
        .result {
            margin-top: 30px;
            padding: 25px;
            border-radius: 8px;
            display: none;
        }
        
        .result.success {
            background-color: #f0fff4;
            border: 1px solid #38a169;
            display: block;
        }
        
        .result.error {
            background-color: #fff5f5;
            border: 1px solid #e53e3e;
            display: block;
        }
        
        .result-title {
            font-size: 1.5rem;
            margin-bottom: 15px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .balance-amount {
            font-size: 2.5rem;
            font-weight: 700;
            color: #0071ce;
            text-align: center;
            margin: 20px 0;
        }
        
        .card-info {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 20px;
            margin-top: 25px;
        }
        
        .info-item {
            background-color: #f8f9fa;
            padding: 15px;
            border-radius: 8px;
        }
        
        /* 内容区域 */
        .content-section {
            margin-bottom: 50px;
        }
        
        .section-title {
            font-size: 1.8rem;
            color: #0071ce;
            margin-bottom: 25px;
            padding-bottom: 10px;
            border-bottom: 3px solid #ffc220;
            display: inline-block;
        }
        
        .guide-steps, .faq-list {
            display: grid;
            gap: 25px;
        }
        
        .step, .faq-item {
            background-color: white;
            padding: 25px;
            border-radius: 10px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
        }
        
        .step-number {
            display: inline-block;
            background-color: #0071ce;
            color: white;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            text-align: center;
            line-height: 36px;
            font-weight: 700;
            margin-right: 15px;
        }
        
        .step h3, .faq-item h3 {
            display: inline-block;
            color: #333;
        }
        
        .faq-item h3 {
            color: #0071ce;
            margin-bottom: 10px;
        }
        
        /* 页脚 */
        footer {
            background-color: #004c91;
            color: white;
            padding: 50px 0 20px;
            margin-top: 50px;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        
        .footer-column h3 {
            font-size: 1.3rem;
            margin-bottom: 20px;
            color: #ffc220;
        }
        
        .footer-column ul {
            list-style: none;
        }
        
        .footer-column ul li {
            margin-bottom: 12px;
        }
        
        .footer-column a {
            color: #d1e3ff;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-column a:hover {
            color: #ffc220;
        }
        
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: #a0c8ff;
            font-size: 0.9rem;
        }
        
        /* 响应式设计 */
        @media (max-width: 992px) {
            .hero h2 {
                font-size: 2.2rem;
            }
            
            .card-checker {
                padding: 30px;
            }
        }
        
        @media (max-width: 768px) {
            .header-content {
                flex-direction: column;
                align-items: flex-start;
                gap: 15px;
            }
            
            nav {
                width: 100%;
                display: none;
            }
            
            nav.active {
                display: block;
            }
            
            nav ul {
                flex-direction: column;
                gap: 0;
            }
            
            nav ul li {
                padding: 12px 0;
                border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            }
            
            .mobile-menu-btn {
                display: block;
                position: absolute;
                top: 25px;
                right: 15px;
            }
            
            .hero {
                padding: 40px 0;
            }
            
            .hero h2 {
                font-size: 1.8rem;
            }
            
            .hero p {
                font-size: 1.1rem;
            }
            
            .card-checker {
                padding: 25px;
            }
            
            .form-title {
                font-size: 1.5rem;
            }
            
            .balance-amount {
                font-size: 2rem;
            }
        }
        
        @media (max-width: 480px) {
            .logo h1 {
                font-size: 1.5rem;
            }
            
            .hero h2 {
                font-size: 1.6rem;
            }
            
            .section-title {
                font-size: 1.5rem;
            }
            
            .step, .faq-item {
                padding: 20px;
            }
        }