/* 保留原所有样式，无修改 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: "Microsoft Yahei", sans-serif;
        }
        body {
            color: #333;
            background-color: #f8f9fa;
            line-height: 1.6;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.3s ease;
        }
        .container {
            width: 90%;
            max-width: 1200px;
            margin: 0 auto;
        }
        button {
            cursor: pointer;
            border: none;
            transition: all 0.3s ease;
        }
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background-color: #fff;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            z-index: 999;
            padding: 15px 0;
        }
        .navbar .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-size: 24px;
            font-weight: bold;
            color: #007bff;
        }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 30px;
        }
        .nav-links li a {
            font-size: 16px;
            font-weight: 500;
        }
        .nav-links li a:hover {
            color: #007bff;
        }
        .mobile-menu-btn {
            display: none;
            font-size: 24px;
            color: #333;
        }
        .banner {
            margin-top: 80px;
            height: 500px;
            background: linear-gradient(135deg, #007bff 0%, #00c6ff 100%);
            color: #fff;
            display: flex;
            align-items: center;
            text-align: center;
        }
        .banner-content {
            width: 100%;
        }
        .banner h1 {
            font-size: 48px;
            margin-bottom: 20px;
        }
        .banner p {
            font-size: 18px;
            margin-bottom: 30px;
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
        }
        .btn-primary {
            padding: 12px 30px;
            background-color: #fff;
            color: #007bff;
            font-size: 16px;
            border-radius: 50px;
            font-weight: 600;
        }
        .btn-primary:hover {
            background-color: #f0f0f0;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .section {
            padding: 80px 0;
        }
        .section-title {
            text-align: center;
            font-size: 36px;
            margin-bottom: 60px;
            color: #333;
            position: relative;
        }
        .section-title::after {
            content: "";
            position: absolute;
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 3px;
            background-color: #007bff;
        }
        .content-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }
        .content-card {
            background-color: #fff;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            padding: 30px;
            transition: all 0.3s ease;
            cursor: pointer; /* 新增：鼠标指针变为手型 */
        }
        .content-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        }
        .content-card i {
            font-size: 40px;
            color: #007bff;
            margin-bottom: 20px;
        }
        .content-card h3 {
            font-size: 20px;
            margin-bottom: 15px;
        }
        .content-card p {
            color: #666;
            line-height: 1.7;
        }
        .about-contact {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
            gap: 40px;
            padding: 80px 0;
        }
        .about-card, .contact-card {
            background-color: #fff;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            padding: 40px;
        }
        .about-card h3, .contact-card h3 {
            font-size: 28px;
            color: #333;
            margin-bottom: 20px;
            color: #007bff;
        }
        .about-card .about-item {
            color: #666;
            line-height: 1.8;
            margin-bottom: 15px;
            display: flex;
            align-items: flex-start;
            gap: 15px;
        }
        .about-card .about-item i {
            font-size: 22px;
            color: #007bff;
            margin-top: 3px;
            flex-shrink: 0;
        }
        .contact-card ul {
            list-style: none;
        }
        .contact-card ul li {
            margin-bottom: 15px;
            font-size: 16px;
            color: #666;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .contact-card ul li i {
            font-size: 20px;
            color: #007bff;
        }
        .footer {
            background-color: #333;
            color: #fff;
            padding: 50px 0 20px;
        }
        .footer .container {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 40px;
        }
        .footer-col h4 {
            font-size: 18px;
            margin-bottom: 20px;
            position: relative;
        }
        .footer-col h4::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: -8px;
            width: 40px;
            height: 2px;
            background-color: #007bff;
        }
        .footer-col ul {
            list-style: none;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a:hover {
            color: #007bff;
            padding-left: 5px;
        }
        .copyright {
            text-align: center;
            margin-top: 40px;
            padding-top: 20px;
            border-top: 1px solid #444;
            font-size: 14px;
            color: #999;
        }
        @media (max-width: 768px) {
            .mobile-menu-btn {
                display: block;
            }
            .nav-links {
                position: fixed;
                top: 80px;
                left: -100%;
                width: 100%;
                height: calc(100vh - 80px);
                background-color: #fff;
                flex-direction: column;
                align-items: center;
                justify-content: center;
                gap: 20px;
                transition: left 0.3s ease;
            }
            .nav-links.active {
                left: 0;
            }
            .banner h1 {
                font-size: 32px;
            }
            .banner p {
                font-size: 16px;
            }
            .section-title {
                font-size: 28px;
            }
            .about-contact {
                grid-template-columns: 1fr;
            }
            .about-card, .contact-card {
                padding: 30px 20px;
            }
            .about-card h3, .contact-card h3 {
                font-size: 24px;
            }
            .about-card .about-item i {
                font-size: 20px;
            }
        }