* {
            margin:0; padding:0; box-sizing:border-box;
            font-family: "Microsoft YaHei", sans-serif;
        }
        body {
            background: #f7f9fc;
            color: #333;
            line-height: 1.7;
            overflow-x: hidden;
        }
        a { text-decoration: none; color: inherit; }
        .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 16px; }
        .section { padding: 50px 0; }
        .title {
            font-size: 24px;
            font-weight: 600;
            text-align: center;
            margin-bottom: 30px;
            color: #111;
        }
        .btn {
            display: inline-block;
            padding: 14px 28px;
            background: #2d6cdf;
            color: #fff;
            border-radius: 8px;
            font-weight: 500;
            transition: .3s;
            border: none;
            cursor: pointer;
            font-size: 15px;
        }
        .btn:hover { background: #1e54bb; }

        /* 导航 - 移动端核心优化 */
        .header {
            position: fixed; top:0; left:0; right:0;
            background: rgba(255,255,255,0.97);
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            z-index: 999;
        }
        .nav {
            display: flex; align-items: center;
            height: 65px;
            position: relative;
        }
        .logo {
            font-size: 20px;
            font-weight: bold;
            color: #2d6cdf;
            flex-shrink: 0;
            margin-right: 16px;
        }
        /* 移动端菜单：横向滚动 */
        .menu {
            display: flex;
            overflow-x: auto;
            white-space: nowrap;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
            flex: 1;
            padding: 10px 0;
        }
        .menu::-webkit-scrollbar { display: none; }
        .menu a {
            font-weight: 500;
            color: #333;
            padding: 8px 12px;
            flex-shrink: 0;
            font-size: 15px;
        }
        .nav .btn {
            display: none; /* 手机端隐藏右侧按钮 */
        }

        /* 首屏 */
        .banner {
            min-height: 80vh;
            background: linear-gradient(to right, #eef2f7, #d7e2f0);
            display: flex; align-items: center;
            text-align: center;
            margin-top: 65px;
            padding: 40px 0;
        }
        .banner h1 {
            font-size: 26px;
            line-height: 1.4;
            margin-bottom: 16px;
        }
        .banner p {
            font-size: 16px;
            color: #555;
            margin-bottom: 24px;
        }

        /* 业务板块 */
        .service-box {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
        }
        .service-item {
            background: #fff;
            padding: 30px 24px;
            border-radius: 12px;
            box-shadow: 0 4px 20px rgba(0,0,0,0.04);
        }
        .service-item h3 {
            margin-bottom: 12px;
            font-size: 18px;
            color: #222;
        }
        .service-item p {
            color: #666;
            font-size: 15px;
        }

        /* 案例 */
        .case-list {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
        }
        .case-item {
            background: #fff;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 4px 15px rgba(0,0,0,0.05);
        }
        .case-item img {
             width: 100%;
             object-fit: cover;
             border-radius: 4px;
        }
        .case-info { padding: 18px; }
        .case-title { font-weight: 500; margin-bottom: 4px; }
        .case-tag { font-size:14px; color:#888; }

        /* 关于 */
        .about { background: #fff; }
        .about-content {
            text-align: center;
            font-size: 15px;
            color: #444;
        }

        /* 团队 */
        .team {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            justify-content: center;
        }
        .team-item {
            width: 140px;
            text-align: center;
        }
        .team-avatar {
            width: 100px; height:100px;
            background: #eee;
            border-radius: 50%;
            margin: 0 auto 12px;
        }
        .team-name { font-weight: 500; }
        .team-post { color:#888; font-size:14px; }

        /* 合作客户 */
        .client { background: #fff; }
        .client-logo {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: center;
            gap: 25px;
        }
        .client-logo img {
            height: 36px;
            opacity: 0.7;
        }

        /* 表单 */
        .contact { background: #fff; }
        .form-box {
            background: #f7f9fc;
            padding: 30px 20px;
            border-radius: 12px;
        }
        .form-item { margin-bottom: 18px; }
        .form-item input,
        .form-item textarea,
        .form-item select {
            width: 100%;
            padding: 14px 16px;
            border: 1px solid #eee;
            border-radius: 8px;
            font-size: 15px;
        }
        .form-item textarea {
            min-height: 120px;
            resize: none;
        }
        .form-btn button { width: 100%; }

        /* 页脚 */
        .footer {
            background: #222;
            color: #ccc;
            padding: 25px 0;
            text-align: center;
            font-size: 14px;
        }

        /* ≥768px 平板/电脑 恢复多列 */
        @media (min-width:768px) {
            .section { padding: 80px 0; }
            .title { font-size: 32px; margin-bottom: 50px; }
            .nav .btn { display: inline-block; }
            .menu { overflow: visible; flex: none; }
            .banner h1 { font-size: 42px; }
            .service-box { grid-template-columns: repeat(2, 1fr); }
            .case-list { grid-template-columns: repeat(3, 1fr); }
        }
        @media (min-width:1024px) {
            .service-box { grid-template-columns: repeat(4, 1fr); }
        }