<style>
        /* ----- 全局变量：柔和蓝色质感风格 ----- */
        :root {
            --primary-blue: #2b6eb3;
            --primary-light: #e8f1fc;
            --accent-blue: #1a4d7a;
            --soft-gray: #f8faff;
            --text-dark: #1e2f4a;
            --text-soft: #2c3e5a;
            --border-light: #d9e6f5;
            --shadow-sm: 0 8px 20px rgba(43, 110, 179, 0.06);
            --shadow-hover: 0 20px 32px -10px rgba(43, 110, 179, 0.14);
            --gradient-bg: linear-gradient(145deg, #ffffff 0%, #f2f8ff 100%);
            --card-radius: 32px;
            --btn-radius: 60px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
        }

        body {
            background: var(--soft-gray);
            color: var(--text-dark);
            line-height: 1.5;
            -webkit-font-smoothing: antialiased;
        }

        a {
            text-decoration: none;
            color: inherit;
        }

        ul {
            list-style: none;
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ----- 头部：符合必应SEO，语义化 header, nav ----- */
        .site-header {
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            box-shadow: var(--shadow-sm);
            position: sticky;
            top: 0;
            z-index: 100;
            border-bottom: 1px solid var(--border-light);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 8px 0;
            flex-wrap: wrap;
        }

        .logo-area {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .logo-icon {
            width: 44px;
            height: 44px;
            background: linear-gradient(145deg, var(--primary-blue), #3a8bd2);
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: bold;
            font-size: 22px;
            box-shadow: 0 8px 14px rgba(43, 110, 179, 0.2);
            transition: 0.2s;
        }

        .logo-icon:hover {
            transform: scale(1.02);
        }

        .logo-text {
            font-size: 1.7rem;
            font-weight: 700;
            letter-spacing: -0.01em;
            background: linear-gradient(135deg, #1a4d7a, #2b6eb3);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .nav-item {
            position: relative;
            padding: 10px 16px;
            font-weight: 600;
            color: var(--text-soft);
            border-radius: 40px;
            transition: all 0.2s;
        }

        .nav-item:hover {
            background: var(--primary-light);
            color: var(--primary-blue);
        }

        .has-submenu:hover .submenu {
            display: block;
        }

        .submenu {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            background: white;
            box-shadow: var(--shadow-hover);
            border-radius: 20px;
            padding: 10px 0;
            min-width: 150px;
            border: 1px solid var(--border-light);
        }

        .submenu a {
            display: block;
            padding: 10px 22px;
            font-weight: 500;
        }

        .submenu a:hover {
            background: var(--primary-light);
        }

        .btn-download-header {
            background: var(--primary-blue);
            color: white !important;
            padding: 10px 24px;
            border-radius: 40px;
            font-weight: 600;
            margin-left: 12px;
            box-shadow: 0 8px 18px rgba(43, 110, 179, 0.25);
            transition: 0.2s;
        }

        .btn-download-header:hover {
            background: #1f5a96;
            transform: scale(1.02);
        }

        /* ----- 底部 ----- */
        .site-footer {
            background: #1a2d44;
            color: #e0edf9;
            margin-top: 70px;
            padding: 48px 0 24px;
            border-radius: 48px 48px 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1.2fr;
            gap: 30px;
        }

        .footer-about p {
            margin: 18px 0 0;
            opacity: 0.85;
            font-size: 0.95rem;
        }

        .footer-links h4 {
            color: white;
            margin-bottom: 18px;
            font-weight: 600;
        }

        .footer-links ul li {
            margin-bottom: 12px;
            opacity: 0.8;
        }

        .footer-links ul li:hover {
            opacity: 1;
            color: white;
        }

        .copyright {
            text-align: center;
            padding-top: 32px;
            margin-top: 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            opacity: 0.7;
        }

        /* ----- 通用样式 ----- */
        section {
            margin: 64px 0;
        }

        .section-title {
            font-size: 2.3rem;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--accent-blue);
            letter-spacing: -0.02em;
        }

        .section-sub {
            color: #4a6885;
            margin-bottom: 36px;
            font-size: 1.2rem;
            font-weight: 400;
        }

        .btn {
            display: inline-block;
            background: white;
            border: 1px solid var(--border-light);
            padding: 12px 30px;
            border-radius: var(--btn-radius);
            font-weight: 600;
            box-shadow: var(--shadow-sm);
            transition: all 0.25s;
        }

        .btn-primary {
            background: var(--primary-blue);
            border: none;
            color: white;
            box-shadow: 0 14px 24px -8px rgba(43, 110, 179, 0.3);
        }

        .btn-primary:hover {
            background: #1f5a96;
            transform: translateY(-3px);
        }

        .btn-outline-blue {
            border-color: var(--primary-blue);
            color: var(--primary-blue);
            background: white;
        }

        .btn-outline-blue:hover {
            background: var(--primary-light);
        }

        /* 卡片质感 */
        .card {
            background: var(--gradient-bg);
            border-radius: var(--card-radius);
            padding: 28px 30px;
            box-shadow: var(--shadow-sm);
            border: 1px solid rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(4px);
            transition: all 0.3s;
        }

        .card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-5px);
        }

        .feature-icon {
            font-size: 2.5rem;
            margin-bottom: 22px;
        }

        /* 响应式 */
        @media (max-width: 900px) {
            .header-inner {
                flex-direction: column;
                gap: 12px;
            }
            .nav-menu {
                flex-wrap: wrap;
                justify-content: center;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 600px) {
            .container {
                padding: 0 18px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .section-title {
                font-size: 1.9rem;
            }
        }

        /* 星级评分 */
        .rating-star {
            color: #fbbf24;
            letter-spacing: 3px;
            font-size: 1.3rem;
        }

        /* 用于隐藏Schema数据 */
        .schema-hidden {
            display: none;
        }
    </style>