:root {
            --red: #ef443b;
            --red-dark: #c0392b;
            --orange: #ee5a3b;
            --text: #1a1a1a;
            --text2: #4a4a4a;
            --gray-light: #f7f8fa;
            --gray-border: #e8eaef;
            --white: #fff;
            --radius: 16px;
            --radius-sm: 8px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
            --shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
            --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.10);
            --transition: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
            --max-w: 1280px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
            color: var(--text);
            background: #fefefe;
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        ul {
            list-style: none;
        }

        /* ===== 导航栏 ===== */
        .nav {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.88);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
            height: 64px;
            display: flex;
            align-items: center;
            padding: 0 5%;
            justify-content: space-between;
            transition: var(--transition);
        }
        .nav-logo img {
            height: 28px;
            width: auto;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }
        .nav-links a {
            font-size: 14px;
            font-weight: 500;
            color: #333;
            padding: 8px 14px;
            border-radius: 20px;
            transition: var(--transition);
            white-space: nowrap;
        }
        .nav-links a:hover {
            background: #fff0ef;
            color: var(--red);
        }
        .nav-cta {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .btn-nav-dl {
            background: var(--red);
            color: #fff;
            font-weight: 600;
            font-size: 14px;
            padding: 9px 20px;
            border-radius: 22px;
            transition: var(--transition);
            white-space: nowrap;
        }
        .btn-nav-dl:hover {
            background: var(--red-dark);
            transform: translateY(-1px);
            box-shadow: 0 4px 14px rgba(239, 68, 59, 0.35);
        }

        /* ===== 通用容器 ===== */
        .container {
            max-width: var(--max-w);
            margin: 0 auto;
            padding: 0 5%;
        }
        .section {
            padding: 90px 0;
        }
        .section-tight {
            padding: 60px 0;
        }

        /* ===== Hero ===== */
        .hero {
            padding: 140px 5% 80px;
            display: flex;
            align-items: center;
            gap: 50px;
            max-width: var(--max-w);
            margin: 0 auto;
            min-height: 80vh;
            position: relative;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: -120px;
            right: -180px;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(239, 68, 59, 0.04) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
            z-index: 0;
        }
        .hero-content {
            flex: 1;
            position: relative;
            z-index: 1;
        }
        .hero-badge {
            display: inline-block;
            background: #fff0ef;
            color: var(--red);
            font-weight: 600;
            font-size: 13px;
            padding: 6px 16px;
            border-radius: 20px;
            margin-bottom: 22px;
            letter-spacing: 0.3px;
        }
        .hero-content h1 {
            font-size: clamp(2.6rem, 5vw, 3.8rem);
            font-weight: 800;
            line-height: 1.18;
            margin-bottom: 18px;
            letter-spacing: -0.02em;
        }
        .hero-content h1 .hl {
            background: linear-gradient(135deg, #ef443b 0%, #ee6b3b 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-content .hero-sub {
            font-size: 1.2rem;
            color: #555;
            margin-bottom: 12px;
            font-weight: 500;
            line-height: 1.5;
        }
        .hero-content .hero-desc {
            font-size: 1.05rem;
            color: #666;
            margin-bottom: 32px;
            max-width: 520px;
            line-height: 1.75;
        }
        .hero-btns {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }
        .btn-primary {
            background: var(--red);
            color: #fff;
            font-weight: 700;
            font-size: 16px;
            padding: 14px 32px;
            border-radius: 28px;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .btn-primary:hover {
            background: var(--red-dark);
            box-shadow: 0 10px 28px rgba(239, 68, 59, 0.35);
            transform: translateY(-2px);
        }
        .btn-secondary {
            border: 2px solid var(--red);
            color: var(--red);
            font-weight: 700;
            font-size: 16px;
            padding: 13px 30px;
            border-radius: 28px;
            transition: var(--transition);
        }
        .btn-secondary:hover {
            background: var(--red);
            color: #fff;
            box-shadow: 0 8px 24px rgba(239, 68, 59, 0.20);
        }
        .hero-visual {
            flex: 1;
            position: relative;
            z-index: 1;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        .hero-visual img {
            width: 100%;
            max-width: 460px;
            border-radius: 20px;
            box-shadow: 0 30px 60px rgba(0, 0, 0, 0.08);
            transition: var(--transition);
        }
        .hero-visual::after {
            content: '';
            position: absolute;
            inset: -20px;
            border-radius: 28px;
            background: linear-gradient(135deg, rgba(239, 68, 59, 0.06) 0%, rgba(238, 107, 59, 0.03) 100%);
            z-index: -1;
            pointer-events: none;
        }

        /* ===== 数据条 ===== */
        .stats-strip {
            background: #fdf2f1;
            border-radius: var(--radius);
            padding: 36px 30px;
            display: flex;
            justify-content: space-around;
            flex-wrap: wrap;
            gap: 24px;
            text-align: center;
            max-width: var(--max-w);
            margin: 0 auto;
        }
        .stat-item .stat-num {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--red);
            letter-spacing: -0.02em;
        }
        .stat-item .stat-label {
            font-size: 0.9rem;
            color: #666;
            margin-top: 4px;
            font-weight: 500;
        }

        /* ===== 速度优势区 ===== */
        .speed-section {
            background: #fff;
        }
        .speed-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 28px;
            margin-top: 40px;
        }
        .speed-card {
            background: var(--gray-light);
            border-radius: var(--radius);
            padding: 36px 28px;
            transition: var(--transition);
            border: 1px solid transparent;
            position: relative;
            overflow: hidden;
        }
        .speed-card:hover {
            border-color: #fdd;
            box-shadow: var(--shadow);
            transform: translateY(-3px);
        }
        .speed-card .card-icon {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            font-size: 28px;
            box-shadow: var(--shadow-sm);
        }
        .speed-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: #1a1a1a;
        }
        .speed-card p {
            font-size: 0.95rem;
            color: #555;
            line-height: 1.7;
        }
        .speed-highlight {
            color: var(--red);
            font-weight: 600;
        }

        /* ===== 平台展示区 ===== */
        .platform-section {
            background: #fafbfc;
            text-align: center;
        }
        .platform-grid {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 20px;
            margin-top: 36px;
        }
        .platform-chip {
            background: #fff;
            border: 1px solid var(--gray-border);
            border-radius: 40px;
            padding: 14px 24px;
            font-weight: 600;
            font-size: 0.95rem;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .platform-chip:hover {
            border-color: var(--red);
            box-shadow: 0 4px 16px rgba(239, 68, 59, 0.10);
            transform: translateY(-2px);
        }
        .platform-chip .dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--red);
            flex-shrink: 0;
        }

        /* ===== 安全区 ===== */
        .security-section {
            background: #fff;
        }
        .security-inner {
            display: flex;
            gap: 40px;
            align-items: center;
            flex-wrap: wrap;
        }
        .security-text {
            flex: 1;
            min-width: 280px;
        }
        .security-text h2 {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 16px;
        }
        .security-text .sec-desc {
            color: #555;
            line-height: 1.8;
            margin-bottom: 20px;
            font-size: 1rem;
        }
        .security-list {
            list-style: none;
            display: grid;
            gap: 12px;
        }
        .security-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 0.95rem;
            color: #333;
            padding: 10px 14px;
            background: #fdf7f6;
            border-radius: var(--radius-sm);
            border-left: 3px solid var(--red);
        }
        .security-list li::before {
            content: '🔒';
            flex-shrink: 0;
            font-size: 1rem;
        }
        .security-visual {
            flex: 1;
            min-width: 260px;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        .security-visual img {
            max-width: 360px;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }

        /* ===== 场景区 ===== */
        .scenarios-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 24px;
            margin-top: 40px;
        }
        .scenario-card {
            background: #fff;
            border-radius: var(--radius);
            padding: 32px 22px;
            text-align: center;
            border: 1px solid var(--gray-border);
            transition: var(--transition);
        }
        .scenario-card:hover {
            box-shadow: var(--shadow-lg);
            border-color: #fcc;
            transform: translateY(-4px);
        }
        .scenario-card .s-icon {
            font-size: 3rem;
            margin-bottom: 16px;
        }
        .scenario-card h3 {
            font-weight: 700;
            margin-bottom: 8px;
            font-size: 1.1rem;
        }
        .scenario-card p {
            font-size: 0.9rem;
            color: #666;
            line-height: 1.65;
        }

        /* ===== 定价区 ===== */
        .pricing-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
            gap: 24px;
            margin-top: 40px;
            align-items: stretch;
        }
        .pricing-card {
            background: #fff;
            border: 1px solid var(--gray-border);
            border-radius: var(--radius);
            padding: 34px 24px;
            display: flex;
            flex-direction: column;
            transition: var(--transition);
            position: relative;
        }
        .pricing-card.featured {
            border: 2px solid var(--red);
            box-shadow: 0 12px 36px rgba(239, 68, 59, 0.10);
        }
        .pricing-ribbon {
            position: absolute;
            top: -14px;
            right: 18px;
            background: var(--red);
            color: #fff;
            font-size: 0.78rem;
            font-weight: 700;
            padding: 5px 16px;
            border-radius: 14px;
            letter-spacing: 0.4px;
        }
        .pricing-card .plan-name {
            font-weight: 700;
            font-size: 1.1rem;
            margin-bottom: 6px;
        }
        .pricing-card .plan-price {
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--red);
            margin: 10px 0;
            letter-spacing: -0.02em;
        }
        .pricing-card .plan-price small {
            font-size: 0.9rem;
            color: #888;
            font-weight: 400;
        }
        .pricing-card .plan-desc {
            color: #666;
            font-size: 0.9rem;
            margin-bottom: 18px;
        }
        .pricing-card ul {
            list-style: none;
            flex: 1;
            margin-bottom: 20px;
        }
        .pricing-card ul li {
            padding: 7px 0;
            font-size: 0.9rem;
            color: #444;
            border-bottom: 1px dashed #f0f0f0;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .pricing-card ul li::before {
            content: '✓';
            color: var(--red);
            font-weight: 700;
        }
        .btn-pricing {
            display: block;
            text-align: center;
            padding: 13px 0;
            border-radius: 26px;
            font-weight: 700;
            transition: var(--transition);
            border: 2px solid var(--red);
            color: var(--red);
            margin-top: auto;
        }
        .btn-pricing:hover {
            background: var(--red);
            color: #fff;
        }
        .btn-pricing-solid {
            background: var(--red);
            color: #fff;
            display: block;
            text-align: center;
            padding: 13px 0;
            border-radius: 26px;
            font-weight: 700;
            transition: var(--transition);
            margin-top: auto;
        }
        .btn-pricing-solid:hover {
            background: var(--red-dark);
            box-shadow: 0 8px 22px rgba(239, 68, 59, 0.30);
        }

        /* ===== CTA区 ===== */
        .cta-banner {
            background: linear-gradient(135deg, #ef443b 0%, #e8372e 40%, #d42e25 100%);
            color: #fff;
            border-radius: var(--radius);
            padding: 50px 40px;
            text-align: center;
            max-width: var(--max-w);
            margin: 0 auto;
            position: relative;
            overflow: hidden;
        }
        .cta-banner::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -60px;
            width: 260px;
            height: 260px;
            background: rgba(255, 255, 255, 0.04);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-banner h2 {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 12px;
            position: relative;
            z-index: 1;
        }
        .cta-banner p {
            font-size: 1.05rem;
            margin-bottom: 24px;
            opacity: 0.9;
            position: relative;
            z-index: 1;
        }
        .btn-cta-white {
            display: inline-block;
            background: #fff;
            color: var(--red);
            font-weight: 700;
            font-size: 16px;
            padding: 14px 36px;
            border-radius: 28px;
            transition: var(--transition);
            position: relative;
            z-index: 1;
        }
        .btn-cta-white:hover {
            background: #ffe8e6;
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.18);
            transform: translateY(-2px);
        }

        /* ===== 页脚 ===== */
        .footer {
            background: #111;
            color: #ccc;
            padding: 60px 5% 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
            gap: 30px;
            max-width: var(--max-w);
            margin: 0 auto;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 16px;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-col h4::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 28px;
            height: 2px;
            background: var(--red);
            border-radius: 1px;
        }
        .footer-col ul li {
            margin-bottom: 8px;
        }
        .footer-col ul li a {
            color: #aaa;
            font-size: 13px;
            transition: var(--transition);
        }
        .footer-col ul li a:hover {
            color: #fff;
        }
        .footer-bottom {
            max-width: var(--max-w);
            margin: 40px auto 0;
            padding-top: 20px;
            border-top: 1px solid #2a2a2a;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 12px;
            color: #777;
        }
        .footer-bottom a {
            color: #999;
            margin-left: 16px;
            transition: var(--transition);
        }
        .footer-bottom a:hover {
            color: #fff;
        }

        /* ===== 标题通用 ===== */
        .section-title {
            text-align: center;
            margin-bottom: 16px;
            font-size: clamp(1.8rem, 3.5vw, 2.4rem);
            font-weight: 700;
            letter-spacing: -0.02em;
        }
        .section-title .hl {
            background: linear-gradient(135deg, #ef443b, #ee6b3b);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .section-subtitle {
            text-align: center;
            color: #666;
            max-width: 640px;
            margin: 0 auto 10px;
            font-size: 1rem;
            line-height: 1.7;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 900px) {
            .hero {
                flex-direction: column;
                text-align: center;
                padding: 120px 5% 50px;
                gap: 30px;
            }
            .hero-content .hero-desc {
                max-width: 100%;
            }
            .hero-btns {
                justify-content: center;
            }
            .hero-visual img {
                max-width: 320px;
            }
            .nav-links a {
                font-size: 12px;
                padding: 6px 10px;
            }
            .security-inner {
                flex-direction: column;
                text-align: center;
            }
            .security-list li {
                text-align: left;
            }
            .stats-strip {
                gap: 16px;
                padding: 24px 16px;
            }
            .stat-item .stat-num {
                font-size: 1.6rem;
            }
        }
        @media (max-width: 600px) {
            .nav-links {
                display: none;
            }
            .hero-content h1 {
                font-size: 2rem;
            }
            .section {
                padding: 50px 0;
            }
            .cta-banner {
                padding: 30px 20px;
            }
            .cta-banner h2 {
                font-size: 1.4rem;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }