@charset "utf-8";
        :root {
            --primary: #1e88e5;
            --primary-light: #42a5f5;
            --accent: #ff8f00;
            --bg-light: #f4f9ff;
            --text-dark: #1e293b;
            --text-muted: #5f6b7a;
            --surface: #ffffff;
            --radius-lg: 1.25rem;
            --shadow-card: 0 8px 24px rgba(0,0,0,0.04), 0 2px 8px rgba(0,0,0,0.02);
            --shadow-hover: 0 16px 32px rgba(30,136,229,0.12), 0 8px 16px rgba(0,0,0,0.04);
            --transition: all 0.25s cubic-bezier(0.23, 1, 0.32, 1);
            --navbar-height: 72px; /* 导航栏高度，用于 body 内边距 */
        }

        body {
            font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
            color: var(--text-dark);
            background-color: #ffffff;
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            padding-top: var(--navbar-height); /* 补偿固定导航栏高度 */
        }
        sup{color:var(--accent);}

        html {
            scroll-behavior: auto !important;
        }
        html, body {
            overflow-x: hidden;
        }

        /* 自定义53客服样式 */
        #icon_menu_module {
            background:var(--primary)!important;
            border-radius:8px
        }
        #_53dk_center__53dk__centerBox {
            transform:none!important;
            will-change:unset!important
        }

        /* 导航栏 - 固定定位 */
        .navbar {
            padding: 0.7rem 0;
            background: #ffffff;
            border-bottom: 1px solid #e2e8f0;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1030;
            height: var(--navbar-height);
        }

        .navbar-brand {
            font-weight: 700;
            font-size: 1.4rem;
            color: #0052d9 !important;
            letter-spacing: -0.4px;
        }
        .navbar-brand img {
            height: 32px;
            margin-right: 8px;
        }
        .nav-link {
            color: var(--text-dark) !important;
            font-weight: 500;
            margin: 0 0.1rem;
            padding: 0.5rem 1.2rem !important;
            border-radius: 2rem;
            transition: var(--transition);
        }
        .nav-link:hover {
            background-color: #e1effe;
            color: var(--primary) !important;
        }
        .btn-outline-primary {
            border-color: #bbdefb;
            color: var(--primary);
            border-radius: 2rem;
            padding: 0.5rem 1.6rem;
            font-weight: 600;
        }
        .btn-outline-primary:hover {
            background-color: var(--primary);
            color: white;
            border-color: var(--primary);
        }
        .btn-primary {
            background-color: var(--primary);
            border: none;
            border-radius: 2rem;
            padding: 0.6rem 1.8rem;
            font-weight: 600;
            box-shadow: 0 6px 14px rgba(30,136,229,0.25);
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: #1976d2;
            transform: translateY(-1px);
            box-shadow: 0 10px 20px rgba(30,136,229,0.35);
        }

        /* 移动端导航图标可见性 */
        .navbar-toggler {
            border-color: rgba(0,0,0,0.1);
        }
        .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(0,0,0,0.55)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }

        /* Hero 区域 */
        .hero-section {
            padding: 6.5rem 0 5rem;
            background: linear-gradient(135deg, #e3f2fd 0%, #f0f8ff 100%);
            position: relative;
            overflow: hidden;
        }
        .hero-content {
            position: relative;
            z-index: 2;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            background: rgba(255,255,255,0.8);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(30,136,229,0.15);
            border-radius: 3rem;
            padding: 0.25rem 1.2rem;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 1.5rem;
            letter-spacing: 0.3px;
        }
        .hero-title {
            font-size: 3.2rem;
            font-weight: 800;
            line-height: 1.2;
            color: #0d2137;
            letter-spacing: -0.5px;
        }
        .hero-highlight {
            background-size: 100% 34%;
            background-repeat: no-repeat;
            background-position: 0 80%;
        }
        .hero-feature-list {
            list-style: none;
            padding-left: 0;
            margin-top: 1.5rem;
        }
        .hero-feature-list li {
            display: flex;
            align-items: center;
            margin-bottom: 0.65rem;
            font-weight: 500;
            color: #1e293b;
        }
        .hero-feature-list i {
            color: var(--accent);
            font-size: 1.25rem;
            margin-right: 0.6rem;
        }
        .hero-image-col {
            position: relative;
            z-index: 2;
        }
        .hero-img-card {
            background: white;
            border-radius: 1.5rem;
            box-shadow: 0 20px 50px -20px rgba(0,0,0,0.06);
            padding: 0.6rem;
            transition: box-shadow 0.3s ease;
        }
        .hero-img-card:hover {
            box-shadow: 0 25px 55px -20px rgba(30,136,229,0.1);
        }

        /* 标题与描述间距优化 */
        .section-title {
            font-weight: 750;
            font-size: 2.2rem;
            color: #0d2137;
            margin-bottom: 0.75rem;
        }
        .section-subtitle {
            color: var(--text-muted);
            font-size: 1.1rem;
            max-width: 620px;
            margin: 0 auto 0.5rem;
        }

        /* 品牌定位 */
        .brand-lead {
            font-size: 1.15rem;
            font-weight: 500;
            color: var(--text-dark);
            margin-top: 0.5rem;
        }

        /* 产品卡片 */
        .product-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 2rem 1.8rem;
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            border: 1px solid #e8f0fe;
            height: 100%;
        }
        .product-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
            border-color: #c5d9f5;
        }
        .product-header {
            display: flex;
            align-items: center;
            margin-bottom: 1.2rem;
        }
        .product-icon {
            width: 48px;
            height: 48px;
            background: #e3f2fd;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 1.6rem;
            flex-shrink: 0;
            margin-right: 0.9rem;
        }
        .product-header h5 {
            margin-bottom: 0;
            font-weight: 700;
            color: #0d2137;
        }

        /* 价格卡片 */
        .price-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 2.2rem 1.8rem;
            text-align: center;
            box-shadow: var(--shadow-card);
            border: 1px solid #e8f0fe;
            transition: var(--transition);
            height: 100%;
            position: relative;
        }
        .price-card.popular {
            border: 2px solid var(--primary);
            box-shadow: 0 18px 40px -12px rgba(30,136,229,0.2);
            background: #ffffff;
            transform: scale(1.03);
        }
        .popular-badge {
            position: absolute;
            top: -13px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--primary);
            color: white;
            padding: 0.2rem 1.6rem;
            border-radius: 2rem;
            font-size: 0.85rem;
            font-weight: 600;
            box-shadow: 0 4px 12px rgba(30,136,229,0.35);
            white-space: nowrap;
        }
        .price-amount {
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--primary);
        }
        .price-unit {
            font-size: 1rem;
            color: #7c8ba0;
            font-weight: 500;
        }
        .price-card ul {
            text-align: left;
            list-style: none;
            padding-left: 0;
            margin-top: 1.5rem;
            color: #334155;
        }
        .price-card ul li {
            margin-bottom: 0.7rem;
            font-size: 0.9rem;
            display: flex;
            align-items: center;
        }
        .price-card ul li i {
            font-size: 1.1rem;
            margin-right: 0.5rem;
            color: #22c55e;
        }

        /* 场景切换 */
        .scene-tab {
            border-radius: 2rem;
            padding: 0.7rem 1.8rem;
            font-weight: 600;
            color: #475569;
            background: #f1f5f9;
            border: none;
            transition: var(--transition);
            margin: 0 0.25rem;
            cursor: pointer;
        }
        .scene-tab.active {
            background: var(--primary);
            color: white;
            box-shadow: 0 6px 16px rgba(30,136,229,0.35);
        }
        .scene-tab:hover:not(.active) {
            background: #e2e8f0;
            color: #1e293b;
        }

        /* CTA */
        .cta-section {
            background: linear-gradient(135deg, #1565c0 0%, #1e88e5 100%);
            border-radius: 2rem;
            padding: 3.5rem 2rem;
            margin: 3rem 0;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: "";
            position: absolute;
            right: -30px;
            bottom: -40px;
            width: 200px;
            height: 200px;
            background: rgba(255,255,255,0.06);
            border-radius: 50%;
            z-index: 1;
        }
        .cta-content {
            position: relative;
            z-index: 2;
        }

        a { color: var(--primary); }

        .footer {
            background: #f8fafc;
            border-top: 1px solid #e2e8f0;
        }
        .footer a {
            color: var(--text-muted);
            text-decoration: none;
        }
        .footer a:hover {
            color: var(--primary-light);
            text-decoration: none;
        }

        /* 移动端适配 */
        @media (max-width: 768px) {
            :root {
                --navbar-height: 62px; /* 移动端导航高度可能不同 */
            }

            /* 折叠菜单绝对定位，不撑开页面 */
            .navbar-collapse {
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: #ffffff;
                z-index: 1020;
                box-shadow: 0 8px 20px rgba(0,0,0,0.08);
                max-height: 80vh;
                overflow-y: auto;
                border-radius: 0 0 1rem 1rem;
            }

            .hero-title { font-size: 2.3rem; }
            .price-card.popular { transform: scale(1); }
            .cta-section { padding: 2.5rem 1rem; }
            .hero-section .col-lg-7 { text-align: center; }
            .hero-section .hero-feature-list li { justify-content: center; }
            .hero-section .d-flex.flex-wrap { justify-content: center; }

            /* 品牌定位居中 */
            #brand .col-lg-6 { text-align: center; }
            #brand img { display: block; margin-left: auto; margin-right: auto; }

            /* 真伪验证居中 */
            #verify .col-lg-7 { text-align: center; }
            #verify .btn { margin-left: auto; margin-right: auto; }
            #verify img { display: block; margin-left: auto; margin-right: auto; }

            .section-title { font-size: 1.8rem; }
        }

        /* 动画 */
        @media (prefers-reduced-motion: no-preference) {
            .fade-up {
                opacity: 0;
                transform: translateY(20px);
                animation: fadeUp 0.7s ease forwards;
            }
            @keyframes fadeUp {
                to { opacity: 1; transform: translateY(0); }
            }
        }