:root {
            /* 主题色：更沉稳的商务蓝 */
            --primary-color: #0066CC;
            --primary-light: #0080FF;
            --primary-hover: #0052A3;
            --text-main: #2c3e50;
            --text-secondary: #555;
            --text-light: #94959F;
            --bg-main: #f5f7fa;
            --bg-white: #fff;
            --bg-footer: #2c3e50;
            --border-color: rgba(255,255,255,0.1);
            /* 间距：加大留白，更大气 */
            --gap-sm: 12px;
            --gap-md: 24px;
            --gap-lg: 36px;
            --gap-xl: 60px;
            /* 字体大小：层级更分明 */
            --font-sm: 15px;
            --font-md: 17px;
            --font-lg: 19px;
            --font-xl: 26px;
            --font-2xl: 38px;
            --font-3xl: 52px;
            /* 阴影/圆角：更精致的质感 */
            --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 15px 30px rgba(0,0,0,0.1);
            --radius-pill: 50px;
            --radius-md: 12px;
            /* 过渡：更丝滑的曲线 */
            --transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
        }

        /* ========== 基础重置 & 通用样式 ========== */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: "Inter", "Microsoft Yahei", "PingFang SC", sans-serif;
        }
        body {
            color: var(--text-main);
            background-color: var(--bg-main);
            line-height: 1.7;
            scroll-behavior: smooth;
            letter-spacing: 0.2px;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        .container {
            width: 88%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 16px;
        }
        button, .btn {
            cursor: pointer;
            border: none;
            transition: var(--transition);
        }

        /* ========== 导航栏：毛玻璃+hover下划线 ========== */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(8px);
            box-shadow: var(--shadow-sm);
            z-index: 999;
            padding: 18px 0;
            transition: var(--transition);
        }
        .navbar .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-size: 28px;
            font-weight: 700;
            color: var(--primary-color);
            letter-spacing: 1px;
        }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 40px;
        }
        .nav-links li a {
            font-size: var(--font-md);
            font-weight: 500;
            position: relative;
        }
        .nav-links li a::after {
            content: "";
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--primary-color);
            transition: width 0.3s ease;
        }
        .nav-links li a:hover {
            color: var(--primary-color);
        }
        .nav-links li a:hover::after {
            width: 100%;
        }
        .mobile-menu-btn {
            display: none;
            font-size: 26px;
            color: var(--text-main);
            background: transparent;
        }

        /* ========== 业务Banner：大气居中+背景装饰 ========== */
        .business-banner {
            margin-top: 94px;
            height: 420px;
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 50%, #00c6ff 100%);
            color: var(--bg-white);
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 0 var(--gap-md);
            position: relative;
            overflow: hidden;
        }
        .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='0.05'%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");
            opacity: 0.6;
        }
        .banner-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 900px;
        }
        .business-banner__title {
            font-size: var(--font-3xl);
            margin-bottom: 20px;
            font-weight: 700;
            letter-spacing: 2px;
            line-height: 1.2;
        }
        .business-banner__desc {
            font-size: var(--font-lg);
            max-width: 800px;
            margin: 0 auto;
            opacity: 0.95;
            line-height: 1.6;
        }

        /* ========== 业务详情：卡片式布局 ========== */
        .business-detail {
            padding: var(--gap-xl) 0;
            background-color: var(--bg-white);
        }
        .business-detail .container {
            max-width: 1100px;
        }
        .section-title {
            text-align: center;
            margin-bottom: 60px;
        }
        .business-detail__title {
            font-size: var(--font-2xl);
            color: var(--text-main);
            margin-bottom: 15px;
            font-weight: 700;
            letter-spacing: 1px;
        }
        .business-detail__title::after {
            content: "";
            display: block;
            width: 80px;
            height: 4px;
            background-color: var(--primary-color);
            margin: 20px auto 0;
            border-radius: 2px;
        }
        .section-desc {
            font-size: var(--font-md);
            color: var(--text-secondary);
            max-width: 800px;
            margin: 0 auto;
            line-height: 1.8;
        }

        /* 服务卡片网格布局 */
        .service-cards {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
            margin-top: 50px;
        }
        .service-card {
            background-color: #f8f9fa;
            border-radius: var(--radius-md);
            padding: 40px 30px;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid rgba(0, 102, 204, 0.05);
        }
        .service-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(0, 102, 204, 0.1);
        }
        .service-card h3 {
            font-size: var(--font-xl);
            color: var(--primary-color);
            margin-bottom: 20px;
            font-weight: 600;
            display: flex;
            align-items: center;
        }
        .service-card h3 i {
            font-size: 28px;
            margin-right: 12px;
            color: var(--primary-color);
        }
        .custom-list {
            list-style: none;
            margin-bottom: var(--gap-lg);
        }
        .custom-list li {
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: var(--gap-sm);
            padding-left: 28px;
            position: relative;
            font-size: var(--font-sm);
        }
        .custom-list li::before {
            content: "\f121";
            font-family: "bootstrap-icons";
            position: absolute;
            left: 0;
            color: var(--primary-color);
            font-size: 18px;
        }

        /* 服务优势板块 */
        .service-advantages {
            margin-top: 80px;
            padding: 40px;
            background: linear-gradient(135deg, #f0f8ff 0%, #e6f7ff 100%);
            border-radius: var(--radius-md);
            text-align: center;
        }
        .service-advantages p {
            font-size: var(--font-md);
            color: var(--text-main);
            margin-bottom: 0;
            font-weight: 500;
        }

        /* 主按钮：大气质感 */
        .btn-primary {
            display: inline-block;
            padding: 14px 40px;
            background-color: var(--primary-color);
            color: var(--bg-white);
            font-size: var(--font-md);
            border-radius: var(--radius-pill);
            font-weight: 600;
            margin-top: 40px;
            box-shadow: 0 8px 15px rgba(0, 102, 204, 0.15);
        }
        .btn-primary:hover {
            background-color: var(--primary-hover);
            transform: translateY(-3px);
            box-shadow: 0 12px 20px rgba(0, 102, 204, 0.2);
        }

        /* ========== 页脚：沉稳大气 ========== */
        .footer {
            background-color: var(--bg-footer);
            color: var(--bg-white);
            padding: 80px 0 30px;
        }
        .footer .container {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 60px;
        }
        .footer-col {
            flex: 1;
            min-width: 220px;
        }
        .footer-col__title {
            font-size: var(--font-lg);
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 8px;
            font-weight: 600;
        }
        .footer-col__title::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: 0;
            width: 50px;
            height: 3px;
            background-color: var(--primary-color);
            border-radius: 1.5px;
        }
        .footer-col__list {
            list-style: none;
        }
        .footer-col__list li {
            margin-bottom: var(--gap-sm);
            font-size: var(--font-sm);
        }
        .footer-col__list li a:hover {
            color: var(--primary-color);
            padding-left: 8px;
        }
        .footer-col__desc {
            color: var(--text-light);
            margin-top: var(--gap-sm);
            font-size: var(--font-sm);
            line-height: 1.8;
        }
        .copyright {
            text-align: center;
            margin-top: 60px;
            padding-top: 30px;
            border-top: 1px solid var(--border-color);
            font-size: var(--font-sm);
            color: var(--text-light);
        }

        /* ========== 响应式适配（对齐business-tax） ========== */
        @media (max-width: 768px) {
            .mobile-menu-btn {
                display: block;
            }
            .nav-links {
                position: fixed;
                top: 94px;
                left: -100%;
                width: 100%;
                height: calc(100vh - 94px);
                background-color: var(--bg-white);
                flex-direction: column;
                align-items: center;
                justify-content: center;
                gap: 25px;
                transition: left 0.4s ease;
                box-shadow: var(--shadow-md);
            }
            .nav-links.active {
                left: 0;
            }
            .business-banner {
                height: 320px;
            }
            .business-banner__title {
                font-size: var(--font-2xl);
            }
            .business-banner__desc {
                font-size: var(--font-md);
            }
            .business-detail__title {
                font-size: 28px;
            }
            .section-desc {
                font-size: var(--font-sm);
            }
            .service-card {
                padding: 30px 20px;
            }
            .service-card h3 {
                font-size: 22px;
            }
            .btn-primary {
                padding: 12px 35px;
                font-size: var(--font-sm);
            }
            .footer {
                padding: 60px 0 20px;
            }
            .footer-col {
                margin-bottom: 20px;
            }
        }