<style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            background: #ffffff;
            color: #1e2a3a;
            line-height: 1.5;
        }
        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }
        /* header */
        header {
            background: #ffffff;
            box-shadow: 0 4px 20px rgba(0,0,0,0.02), 0 1px 0 #eef2f6;
            position: sticky;
            top: 0;
            z-index: 100;
        }
        .header-flex {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            padding: 16px 0;
        }
        .logo-area h1 {
            font-size: 1.8rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            gap: 10px;
            color: #0077ff;
        }
        .logo-area i {
            font-size: 2rem;
            color: #0077ff;
        }
        .logo-area span {
            background: linear-gradient(135deg, #0077ff, #00c3ff);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
        }
        .nav-links {
            display: flex;
            gap: 32px;
            align-items: center;
        }
        .nav-links a {
            text-decoration: none;
            font-weight: 600;
            color: #1e2a3a;
            transition: 0.2s;
        }
        .nav-links a:hover, .nav-links a.active {
            color: #0077ff;
        }
        /* buttons */
        .btn-primary {
            background: #0077ff;
            color: white;
            border: none;
            padding: 12px 28px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: 0.2s;
            display: inline-block;
            text-decoration: none;
        }
        .btn-primary:hover {
            background: #0062d9;
            transform: translateY(-2px);
        }
        .btn-outline {
            background: transparent;
            border: 1.5px solid #0077ff;
            color: #0077ff;
            padding: 10px 24px;
            border-radius: 40px;
            font-weight: 600;
            text-decoration: none;
            transition: 0.2s;
        }
        .btn-outline:hover {
            background: #0077ff10;
        }
        /* hero download */
        .hero-download {
            background: linear-gradient(145deg, #f0f9ff 0%, #e6f4ff 100%);
            min-height: 70vh;
            display: flex;
            align-items: center;
            padding: 60px 0;
        }
        .hero-grid {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 40px;
        }
        .hero-left {
            flex: 1.2;
        }
        .hero-left h2 {
            font-size: 3rem;
            margin-bottom: 20px;
            color: #0a2540;
        }
        .hero-left p {
            font-size: 1.2rem;
            margin-bottom: 32px;
            color: #2c3e50;
        }
        .download-buttons {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
        }
        .stats-mini {
            display: flex;
            gap: 32px;
            margin-top: 40px;
            flex-wrap: wrap;
        }
        .stat-card {
            background: white;
            border-radius: 28px;
            padding: 12px 24px;
            box-shadow: 0 8px 20px rgba(0,0,0,0.03);
            text-align: center;
            min-width: 120px;
        }
        .stat-number {
            font-size: 1.8rem;
            font-weight: 800;
            color: #0077ff;
        }
        .stars i {
            color: #ffb800;
        }
        /* cards grid */
        .section-title {
            font-size: 2.2rem;
            margin: 48px 0 32px 0;
            text-align: center;
            color: #0f2b3d;
        }
        .cards-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 32px;
            margin-bottom: 48px;
        }
        .icon-card {
            background: #ffffff;
            border-radius: 32px;
            padding: 28px 20px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
            transition: all 0.2s;
            text-align: center;
            border: 1px solid #eef2f8;
        }
        .icon-card i {
            font-size: 2.8rem;
            color: #0077ff;
            margin-bottom: 20px;
        }
        .icon-card h3 {
            font-size: 1.5rem;
            margin-bottom: 12px;
        }
        .long-text {
            background: #f8fafd;
            padding: 40px;
            border-radius: 32px;
            margin: 32px 0;
            line-height: 1.7;
        }
        .platform-icons {
            display: flex;
            flex-wrap: wrap;
            gap: 28px;
            justify-content: center;
            margin: 40px 0;
        }
        .platform-item {
            background: white;
            border-radius: 36px;
            padding: 20px 30px;
            text-align: center;
            box-shadow: 0 6px 14px rgba(0,0,0,0.05);
            width: 150px;
        }
        .faq-item {
            background: #ffffff;
            border-bottom: 1px solid #e2e8f0;
            margin-bottom: 4px;
        }
        .faq-question {
            background: #f9fcff;
            padding: 18px 20px;
            font-weight: 700;
            font-size: 1.1rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-radius: 16px;
            transition: 0.1s;
        }
        .faq-question:hover {
            background: #eef4fa;
        }
        .faq-answer {
            padding: 0 20px 18px 20px;
            display: none;
            color: #2d3e50;
            border-top: 1px dashed #e2edf7;
            margin-top: 4px;
        }
        .faq-answer.show {
            display: block;
        }
        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px,1fr));
            gap: 28px;
            margin: 40px 0;
        }
        .testimonial {
            background: #fbfeff;
            border-radius: 28px;
            padding: 24px;
            box-shadow: 0 6px 12px rgba(0,0,0,0.03);
            border: 1px solid #eef2ff;
        }
        .news-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-bottom: 1px solid #eef2f8;
            padding: 16px 0;
        }
        .news-date {
            color: #0077ff;
            font-weight: 500;
        }
        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 28px;
            justify-content: center;
            margin: 40px 0 30px;
        }
        .footer {
            background: #0a1c2f;
            color: #cbd5e1;
            padding: 48px 0 32px;
            margin-top: 64px;
        }
        .footer a {
            color: #94a3b8;
            text-decoration: none;
        }
        .keyword-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin: 20px 0;
        }
        .keyword-tags span {
            background: #1e2f44;
            padding: 6px 14px;
            border-radius: 40px;
            font-size: 0.85rem;
            color: #bbd4ff;
        }
        .footer-nav {
            display: flex;
            gap: 32px;
            flex-wrap: wrap;
            margin-top: 20px;
        }
        @media (max-width: 800px) {
            .header-flex { flex-direction: column; gap: 16px; }
            .hero-left h2 { font-size: 2rem; }
        }
    </style>