* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
        }
        :root {
            --primary: #0052cc;
            --primary-light: #0066ff;
            --dark: #0f172a;
            --gray: #64748b;
            --light: #f8fafc;
            --radius: 16px;
            --shadow: 0 12px 32px rgba(0,0,0,0.07);
            --shadow-lg: 0 20px 40px rgba(0,0,0,0.1);
        }
        a {
            text-decoration: none; /* 去除下划线 */
            color: inherit; /* 继承父元素的文字颜色 */
        }

        body {
            color: var(--dark);
            background: #fff;
            line-height: 1.7;
        }
        img {
            max-width: 100%;
            border-radius: var(--radius);
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 导航 */
        header {
            position: sticky;
            top: 0;
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            z-index: 999;
        }
        .nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 76px;
        }
        .logo {
            font-size: 24px;
            font-weight: 700;
            color: var(--primary);
        }
        .nav-menu a {
            margin-left: 32px;
            text-decoration: none;
            color: var(--dark);
            font-weight: 500;
            transition: 0.3s;
        }
        .nav-menu a:hover {
            color: var(--primary);
        }

        /* 首屏 */
        .hero {
            padding: 100px 0;
            background: linear-gradient(135deg, #e6f0ff 0%, #ffffff 100%);
            text-align: center;
            overflow: hidden;
        }
        .hero h1 {
            font-size: 48px;
            margin-bottom: 20px;
            max-width: 850px;
            margin-left: auto;
            margin-right: auto;
            line-height: 1.3;
        }
        .hero p {
            font-size: 20px;
            color: var(--gray);
            max-width: 720px;
            margin: 0 auto 40px;
        }
        .hero-img {
            max-width: 860px;
            margin: 50px auto 0;
            border-radius: 20px;
            box-shadow: var(--shadow-lg);
        }
        .btn {
            display: inline-block;
            padding: 16px 40px;
            background: var(--primary);
            color: #fff;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 500;
            font-size: 16px;
            transition: 0.3s;
            box-shadow: 0 6px 20px rgba(0,82,204,0.25);
        }
        .btn:hover {
            background: var(--primary-light);
            transform: translateY(-3px);
            box-shadow: 0 10px 25px rgba(0,82,204,0.3);
        }

        /* 模块标题 */
        .section-title {
            text-align: center;
            margin-bottom: 60px;
        }
        .section-title h2 {
            font-size: 36px;
            margin-bottom: 14px;
        }
        .section-title p {
            color: var(--gray);
            font-size: 18px;
        }

        /* 核心能力 */
        .abilities {
            padding: 100px 0;
        }
        .grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
        }
        .card {
            background: #fff;
            border-radius: var(--radius);
            padding: 36px 30px;
            box-shadow: var(--shadow);
            transition: 0.4s;
            text-align: center;
        }
        .card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-lg);
        }
        .card-icon {
            width: 64px;
            height: 64px;
            margin: 0 auto 20px;
            background: linear-gradient(135deg, #0052cc, #0088ff);
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 28px;
        }
        .card h3 {
            font-size: 20px;
            margin-bottom: 12px;
        }
        .card p {
            color: var(--gray);
            font-size: 15px;
        }

        /* 产品能力 */
        .products {
            padding: 100px 0;
            background: var(--light);
        }
        .product-item {
            display: flex;
            align-items: center;
            gap: 40px;
            margin-bottom: 50px;
            padding: 40px;
            background: #fff;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        .product-item:nth-child(even) {
            flex-direction: row-reverse;
        }
        .product-img {
            flex: 1;
        }
        .product-text {
            flex: 1;
        }
        .product-item h3 {
            color: var(--primary);
            font-size: 24px;
            margin-bottom: 20px;
        }
        .product-item ul {
            padding-left: 22px;
            color: var(--gray);
            font-size: 16px;
        }
        .product-item li {
            margin-bottom: 10px;
        }

        /* 优势 */
        .advantage {
            padding: 100px 0;
        }
        .adv-item {
            display: flex;
            align-items: center;
            margin-bottom: 24px;
            padding: 28px;
            background: #fff;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            transition: 0.3s;
        }
        .adv-item:hover {
            transform: translateX(6px);
        }
        .step-num {
            width: 48px;
            height: 48px;
            background: var(--primary);
            color: #fff;
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: 600;
            margin-right: 20px;
            flex-shrink: 0;
        }
        .adv-item h4 {
            font-size: 18px;
            margin-bottom: 4px;
        }
        .adv-item p {
            color: var(--gray);
        }

        /* 流程 */
        .process {
            padding: 100px 0;
            background: var(--light);
        }
        .step {
            display: flex;
            justify-content: space-between;
            text-align: center;
            gap: 30px;
        }
        .step-item {
            flex: 1;
        }
        .step-num-big {
            width: 70px;
            height: 70px;
            background: var(--primary);
            color: #fff;
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            font-weight: 600;
            margin-bottom: 20px;
            box-shadow: 0 8px 20px rgba(0,82,204,0.2);
        }
        .step-item h4 {
            font-size: 18px;
            margin-bottom: 8px;
        }
        .step-item p {
            color: var(--gray);
        }

        /* 案例 */
        .case {
            padding: 100px 0;
        }
        .case-card {
            display: flex;
            align-items: center;
            gap: 40px;
            padding: 50px;
            background: #fff;
            border-radius: var(--radius);
            box-shadow: var(--shadow-lg);
        }
        .case-img {
            flex: 1;
        }
        .case-text {
            flex: 1;
        }
        .case-card h3 {
            font-size: 26px;
            margin-bottom: 16px;
        }
        .case-card p {
            color: var(--gray);
            font-size: 16px;
            line-height: 1.8;
        }

        /* 底部 */
        footer {
            background: var(--dark);
            color: #fff;
            padding: 60px 0;
            text-align: center;
        }
        footer p {
            margin-bottom: 10px;
            color: rgba(255,255,255,0.8);
        }

        /* 自适应 */
        @media (max-width: 992px) {
            .grid { grid-template-columns: repeat(2,1fr); }
            .product-item, .case-card { flex-direction: column !important; text-align: center; }
            .step { flex-wrap: wrap; }
            .step-item { flex: 45%; }
        }
        @media (max-width: 768px) {
            .hero h1 { font-size: 32px; }
            .hero p { font-size: 17px; }
            .nav-menu { display: none; }
            .grid { grid-template-columns: 1fr; }
            .step-item { flex: 100%; }
        }