/* ========== 全局CSS变量：统一品牌风格，易维护 ========== */
        :root {
            /* 主色调：沉稳商务蓝，适配科技/软件开发场景 */
            --primary: #0066CC;
            --primary-light: #0080FF;
            --primary-hover: #0052A3;
            /* 文字色阶：层级分明，提升可读性 */
            --text-main: #1E293B;
            --text-secondary: #475569;
            --text-light: #94A3B8;
            /* 背景色：柔和高级，贴合科技感 */
            --bg-body: #F8FAFC;
            --bg-white: #FFFFFF;
            --bg-card: #F1F5F9;
            --bg-footer: #1E293B;
            /* 间距体系：加大留白，更显大气 */
            --gap-xs: 8px;
            --gap-sm: 16px;
            --gap-md: 24px;
            --gap-lg: 40px;
            --gap-xl: 60px;
            /* 字体体系：层级清晰，适配中文 */
            --font-xs: 14px;
            --font-sm: 16px;
            --font-md: 18px;
            --font-lg: 22px;
            --font-xl: 32px;
            --font-2xl: 48px;
            /* 视觉质感：阴影/圆角/过渡 */
            --shadow-sm: 0 4px 12px rgba(0,0,0,0.05);
            --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 36px rgba(0,0,0,0.12);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
        }

        /* ========== 基础重置 & 全局样式 ========== */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: "Inter", "PingFang SC", "Microsoft Yahei", sans-serif;
        }
        body {
            color: var(--text-main);
            background-color: var(--bg-body);
            line-height: 1.8;
            scroll-behavior: smooth;
            letter-spacing: 0.3px;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        .container {
            width: 90%;
            max-width: 1440px;
            margin: 0 auto;
            padding: 0 var(--gap-sm);
        }
        button, .btn {
            cursor: pointer;
            border: none;
            transition: var(--transition);
        }

        /* ========== 导航栏：毛玻璃+滚动动效，科技感拉满 ========== */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(12px);
            box-shadow: var(--shadow-sm);
            z-index: 999;
            padding: 20px 0;
            border-bottom: 1px solid rgba(0, 102, 204, 0.06);
        }
        .navbar .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-size: 30px;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: 1.2px;
        }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 45px;
        }
        .nav-links li a {
            font-size: var(--font-md);
            font-weight: 500;
            position: relative;
        }
        /* 导航下划线动效：细腻展开，科技感交互 */
        .nav-links li a::after {
            content: "";
            position: absolute;
            bottom: -6px;
            left: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--primary), var(--primary-light));
            border-radius: 1px;
            transition: width 0.35s ease-in-out;
        }
        .nav-links li a:hover {
            color: var(--primary);
        }
        .nav-links li a:hover::after {
            width: 100%;
        }
        .mobile-menu-btn {
            display: none;
            font-size: 28px;
            color: var(--text-main);
            background: transparent;
            padding: 5px 10px;
            border-radius: var(--radius-sm);
        }
        .mobile-menu-btn:hover {
            background-color: rgba(0, 102, 204, 0.05);
        }

        /* ========== Banner区域：科技感全屏视觉，更具冲击力 ========== */
        .business-banner {
            margin-top: 98px;
            height: 480px;
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 50%, #0099CC 100%);
            color: var(--bg-white);
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 0 var(--gap-md);
            position: relative;
            overflow: hidden;
        }
        /* 科技感背景纹理，增加层次 */
        .business-banner::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.06'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
            z-index: 1;
        }
        .banner-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 1000px;
        }
        .business-banner h1 {
            font-size: var(--font-2xl);
            margin-bottom: var(--gap-md);
            font-weight: 700;
            letter-spacing: 1.5px;
            line-height: 1.2;
        }
        .business-banner p {
            font-size: var(--font-lg);
            max-width: 850px;
            margin: 0 auto;
            opacity: 0.95;
            line-height: 1.7;
        }

        /* ========== 业务详情：卡片式布局+hover动效，科技感立体 ========== */
        .business-detail {
            padding: var(--gap-xl) 0;
            background-color: var(--bg-white);
            margin: var(--gap-lg) auto;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
        }
        .business-detail .container {
            max-width: 1200px;
        }
        .section-header {
            text-align: center;
            margin-bottom: var(--gap-xl);
        }
        .section-header h2 {
            font-size: var(--font-xl);
            color: var(--text-main);
            margin-bottom: var(--gap-sm);
            font-weight: 700;
            letter-spacing: 1px;
            position: relative;
            display: inline-block;
        }
        /* 标题渐变下划线，居中显示 */
        .section-header h2::after {
            content: "";
            position: absolute;
            bottom: -12px;
            left: 50%;
            transform: translateX(-50%);
            width: 90px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--primary-light));
            border-radius: 2px;
        }
        .section-header p {
            font-size: var(--font-md);
            color: var(--text-secondary);
            max-width: 900px;
            margin: 0 auto;
            line-height: 1.8;
            margin-top: var(--gap-lg);
        }

        /* 软件开发服务卡片网格 */
        .service-cards {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: var(--gap-lg);
            margin-top: var(--gap-xl);
        }
        .service-card {
            background-color: var(--bg-card);
            border-radius: var(--radius-md);
            padding: var(--gap-lg) var(--gap-md);
            border: 1px solid rgba(0, 102, 204, 0.08);
            transition: var(--transition);
        }
        .service-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(0, 102, 204, 0.15);
        }
        .service-card h3 {
            font-size: var(--font-lg);
            color: var(--primary);
            margin-bottom: var(--gap-md);
            font-weight: 600;
            display: flex;
            align-items: center;
        }
        .service-card h3 i {
            font-size: 28px;
            margin-right: 12px;
            color: var(--primary-light);
        }
        .service-card ul {
            list-style: none;
            margin-bottom: var(--gap-md);
        }
        .service-card ul li {
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: var(--gap-xs);
            padding-left: 30px;
            position: relative;
            font-size: var(--font-sm);
        }
        /* 列表对勾图标优化，科技感样式 */
        .service-card ul li::before {
            content: "\f26a";
            font-family: "bootstrap-icons";
            position: absolute;
            left: 0;
            color: var(--primary);
            font-size: 18px;
            font-weight: 600;
        }

        /* 服务优势板块：科技感渐变背景 */
        .service-advantages {
            margin-top: var(--gap-xl);
            padding: var(--gap-lg);
            background: linear-gradient(135deg, #EEF2FF 0%, #E0F2FE 100%);
            border-radius: var(--radius-md);
            text-align: center;
        }
        .service-advantages p {
            font-size: var(--font-md);
            color: var(--text-main);
            font-weight: 500;
            margin-bottom: 0;
        }

        /* 主按钮：渐变+上浮动效，科技感醒目 */
        .btn-primary {
            display: inline-block;
            padding: 16px 45px;
            background: linear-gradient(90deg, var(--primary) 0%, var(--primary-light) 100%);
            color: var(--bg-white);
            font-size: var(--font-md);
            border-radius: var(--radius-lg);
            font-weight: 600;
            margin-top: var(--gap-lg);
            box-shadow: 0 6px 20px rgba(0, 102, 204, 0.2);
        }
        .btn-primary:hover {
            background: linear-gradient(90deg, var(--primary-hover) 0%, var(--primary) 100%);
            transform: translateY(-4px);
            box-shadow: 0 10px 28px rgba(0, 102, 204, 0.28);
        }

        /* ========== 页脚：沉稳大气，层级清晰 ========== */
        .footer {
            background-color: var(--bg-footer);
            color: var(--bg-white);
            padding: var(--gap-xl) 0 30px;
            margin-top: var(--gap-xl);
        }
        .footer .container {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: var(--gap-xl);
        }
        .footer-col {
            flex: 1;
            min-width: 240px;
        }
        .footer-col h4 {
            font-size: var(--font-md);
            margin-bottom: var(--gap-lg);
            position: relative;
            padding-bottom: 10px;
            font-weight: 600;
            letter-spacing: 0.5px;
        }
        .footer-col h4::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: 0;
            width: 55px;
            height: 3px;
            background-color: var(--primary-light);
            border-radius: 1.5px;
        }
        .footer-col ul {
            list-style: none;
        }
        .footer-col ul li {
            margin-bottom: var(--gap-sm);
            font-size: var(--font-xs);
            color: var(--text-light);
        }
        .footer-col ul li a:hover {
            color: var(--primary-light);
            padding-left: 8px;
        }
        .footer-col p {
            color: var(--text-light);
            font-size: var(--font-xs);
            line-height: 1.8;
        }
        .copyright {
            text-align: center;
            margin-top: var(--gap-xl);
            padding-top: var(--gap-md);
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: var(--font-xs);
            color: var(--text-light);
            letter-spacing: 0.5px;
        }

        /* ========== 响应式适配：全尺寸适配，保持大气风格 ========== */
        @media (max-width: 992px) {
            .nav-links {
                gap: 30px;
            }
            .business-banner h1 {
                font-size: 40px;
            }
            .business-banner p {
                font-size: 20px;
            }
            .section-header h2 {
                font-size: 28px;
            }
        }
        @media (max-width: 768px) {
            .mobile-menu-btn {
                display: block;
            }
            .nav-links {
                position: fixed;
                top: 98px;
                left: -100%;
                width: 100%;
                height: calc(100vh - 98px);
                background-color: var(--bg-white);
                flex-direction: column;
                align-items: center;
                justify-content: center;
                gap: 35px;
                transition: left 0.4s ease;
                box-shadow: var(--shadow-md);
            }
            .nav-links.active {
                left: 0;
            }
            .business-banner {
                height: 380px;
            }
            .business-banner h1 {
                font-size: 32px;
            }
            .business-banner p {
                font-size: 18px;
            }
            .service-cards {
                grid-template-columns: 1fr;
                gap: var(--gap-md);
            }
            .service-card {
                padding: var(--gap-md) var(--gap-sm);
            }
            .btn-primary {
                padding: 14px 38px;
                font-size: var(--font-sm);
            }
            .footer {
                padding: var(--gap-lg) 0 20px;
            }
            .footer .container {
                gap: var(--gap-lg);
            }
        }