:root {
            --primary: #0A2540;
            --primary-light: #0E4D8C;
            --accent: #00C2A8;
            --accent-dark: #009B86;
            --cta: #FF7A1A;
            --cta-hover: #E56500;
            --bg: #F5F7FB;
            --text: #1A2B3C;
            --muted: #5A6B7C;
            --white: #ffffff;
            --footer-bg: #081426;
            --footer-text: rgba(255,255,255,0.75);
            --hero-gradient: linear-gradient(135deg, #0A2540 0%, #0E4D8C 55%, #00C2A8 130%);
            --card-shadow: 0 5px 18px rgba(10,37,64,0.08);
            --radius: 16px;
        }
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif; line-height: 1.6; color: var(--text); background: var(--bg); }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

        header { background: rgba(255,255,255,0.96); backdrop-filter: blur(12px); position: fixed; top: 0; left: 0; right: 0; z-index: 1000; box-shadow: 0 2px 12px rgba(10,37,64,0.08); transition: all 0.3s; }
        header.scrolled { background: rgba(255,255,255,0.99); }
        nav { display: flex; justify-content: space-between; align-items: center; padding: 15px 0; }
        .logo { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--primary); font-size: 24px; font-weight: bold; }
        .logo img { height: 40px; }
        .logo span { color: var(--accent-dark); }
        .nav-links { display: flex; gap: 22px; list-style: none; }
        .nav-links a { text-decoration: none; color: var(--text); font-weight: 500; transition: color 0.3s; position: relative; font-size: 15px; }
        .nav-links a:hover, .nav-links a.active { color: var(--accent-dark); }
        .nav-links a.active::after { content: ''; position: absolute; bottom: -5px; left: 0; right: 0; height: 2px; background: var(--accent); }
        .nav-right { display: flex; align-items: center; gap: 16px; }
        .lang-switch select { padding: 8px 28px 8px 12px; border: 1px solid #ddd; border-radius: 6px; background: white; cursor: pointer; color: var(--text); }
        .login-btn { padding: 8px 20px; background: var(--cta); color: white; border: none; border-radius: 6px; cursor: pointer; text-decoration: none; font-weight: 500; transition: background 0.3s; }
        .login-btn:hover { background: var(--cta-hover); }
        .mobile-menu-btn { display: none; background: none; border: none; font-size: 24px; cursor: pointer; color: var(--primary); }

        .hero { padding: 130px 0 80px; background: var(--hero-gradient); color: white; position: relative; overflow: hidden; }
        .hero::before { content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: radial-gradient(circle at 20% 20%, rgba(255,255,255,0.12) 0%, transparent 40%), radial-gradient(circle at 80% 80%, rgba(0,194,168,0.18) 0%, transparent 40%); }
        .hero-content { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; position: relative; z-index: 1; }
        .hero-text h1 { font-size: 46px; margin-bottom: 18px; line-height: 1.2; color: #fff; }
        .hero-text .sub { font-size: 19px; margin-bottom: 28px; opacity: 0.92; }
        .hero-stats { display: flex; gap: 30px; margin-bottom: 28px; }
        .hero-stat { text-align: center; }
        .hero-stat .number { font-size: 30px; font-weight: bold; display: block; color: #fff; }
        .hero-stat .label { font-size: 13px; opacity: 0.85; }
        .hero-buttons { display: flex; gap: 14px; flex-wrap: wrap; }
        .btn-primary { padding: 14px 32px; background: var(--cta); color: white; border: none; border-radius: 8px; font-size: 16px; font-weight: 600; cursor: pointer; text-decoration: none; display: inline-block; transition: all 0.3s; animation: pulse 2s infinite; }
        .btn-primary:hover { background: var(--cta-hover); transform: translateY(-2px); box-shadow: 0 10px 20px rgba(255,122,26,0.35); }
        .btn-secondary { padding: 14px 32px; background: transparent; color: white; border: 2px solid white; border-radius: 8px; font-size: 16px; font-weight: 600; cursor: pointer; text-decoration: none; display: inline-block; transition: all 0.3s; }
        .btn-secondary:hover { background: white; color: var(--primary); }

        .simulator { background: rgba(255,255,255,0.14); border-radius: 20px; padding: 26px; backdrop-filter: blur(12px); border: 1px solid rgba(255,255,255,0.25); box-shadow: 0 20px 50px rgba(0,0,0,0.25); }
        .sim-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
        .sim-brand { display: flex; align-items: center; gap: 8px; font-size: 16px; font-weight: 600; color: #fff; }
        .sim-brand .logo-dot { width: 22px; height: 22px; border-radius: 6px; background: var(--cta); display: inline-flex; align-items: center; justify-content: center; font-size: 12px; }
        .sim-status { display: flex; align-items: center; gap: 7px; font-size: 13px; padding: 5px 12px; border-radius: 20px; background: rgba(0,0,0,0.2); color: rgba(255,255,255,0.9); }
        .sim-status .dot { width: 9px; height: 9px; border-radius: 50%; background: #e0e0e0; }
        .sim-status.connected { background: rgba(0,194,168,0.3); }
        .sim-status.connected .dot { background: #00C2A8; animation: blink 1.5s infinite; }
        .sim-status.connecting .dot { background: #FFC107; animation: blink 0.7s infinite; }

        .sim-map { position: relative; height: 210px; background: rgba(0,0,0,0.22); border-radius: 12px; overflow: hidden; margin-bottom: 16px; }
        .sim-map svg { width: 100%; height: 100%; }
        .sim-map .grid { position: absolute; inset: 0; background-image: linear-gradient(rgba(255,255,255,0.06) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.06) 1px, transparent 1px); background-size: 24px 24px; }
        .sim-user { position: absolute; width: 14px; height: 14px; background: #fff; border-radius: 50%; box-shadow: 0 0 12px #fff; left: 50%; top: 78%; transform: translate(-50%, -50%); z-index: 2; }
        .sim-user-label { position: absolute; left: 50%; top: 88%; transform: translateX(-50%); font-size: 11px; opacity: 0.8; z-index: 2; color: #fff; }
        .sim-node { position: absolute; width: 11px; height: 11px; background: #00C2A8; border-radius: 50%; box-shadow: 0 0 10px #00C2A8; z-index: 2; }
        .sim-node-label { position: absolute; font-size: 10px; opacity: 0.85; white-space: nowrap; transform: translateX(-50%); z-index: 2; color: #fff; }

        .sim-control { display: flex; flex-direction: column; align-items: center; gap: 14px; }
        .sim-connect { width: 100%; padding: 15px; border: none; border-radius: 12px; font-size: 16px; font-weight: 700; cursor: pointer; background: linear-gradient(135deg, #FF7A1A, #FF9F4D); color: white; transition: all 0.3s; letter-spacing: 2px; }
        .sim-connect:hover { transform: translateY(-2px); box-shadow: 0 10px 22px rgba(255,122,26,0.4); }
        .sim-connect.connected { background: linear-gradient(135deg, #009B86, #00C2A8); }
        .sim-metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; width: 100%; }
        .sim-metric { background: rgba(255,255,255,0.1); padding: 10px 12px; border-radius: 8px; }
        .sim-metric .label { font-size: 11px; opacity: 0.75; margin-bottom: 2px; color: rgba(255,255,255,0.9); }
        .sim-metric .value { font-size: 14px; font-weight: 600; font-family: 'Courier New', monospace; color: #fff; }

        @keyframes pulse { 0%, 100% { box-shadow: 0 0 0 0 rgba(255,122,26,0.4); } 50% { box-shadow: 0 0 0 10px rgba(255,122,26,0); } }
        @keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }

        .features { padding: 80px 0; background: white; }
        .section-title { text-align: center; font-size: 34px; margin-bottom: 12px; color: var(--primary); }
        .section-subtitle { text-align: center; font-size: 17px; color: var(--muted); margin-bottom: 48px; }
        .features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 28px; }
        .feature-card { background: #F8FAFD; padding: 30px; border-radius: var(--radius); text-align: center; transition: all 0.3s; border: 1px solid #E7EDF5; }
        .feature-card:hover { transform: translateY(-8px); box-shadow: var(--card-shadow); border-color: var(--accent); }
        .feature-icon { width: 60px; height: 60px; background: linear-gradient(135deg, #0A2540 0%, #00C2A8 100%); border-radius: 12px; display: flex; align-items: center; justify-content: center; margin: 0 auto 18px; font-size: 28px; }
        .feature-card h3 { font-size: 20px; margin-bottom: 10px; color: var(--primary); }
        .feature-card p { color: var(--muted); font-size: 15px; }

        .tech-section { padding: 80px 0; background: linear-gradient(135deg, #EDF3FA 0%, #D9E8F5 100%); }
        .tech-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 28px; margin-top: 10px; }
        .tech-card { background: white; padding: 30px; border-radius: var(--radius); box-shadow: var(--card-shadow); }
        .tech-card h3 { font-size: 21px; margin-bottom: 14px; color: var(--accent-dark); }
        .tech-card ul { list-style: none; }
        .tech-card li { padding: 10px 0; border-bottom: 1px solid #eee; display: flex; align-items: center; gap: 10px; color: var(--text); }
        .tech-card li:before { content: '✓'; color: var(--accent); font-weight: bold; }

        /* 新增创意版块：永不掉线承诺 */
        .never-drop { padding: 80px 0; background: #F0F4FA; }
        .never-drop-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 28px; margin-top: 10px; }
        .never-drop-card { background: white; padding: 35px 25px; border-radius: var(--radius); text-align: center; box-shadow: var(--card-shadow); transition: transform 0.3s; }
        .never-drop-card:hover { transform: translateY(-6px); }
        .never-drop-icon { font-size: 42px; margin-bottom: 14px; }
        .never-drop-card h3 { font-size: 20px; margin-bottom: 10px; color: var(--primary); }
        .never-drop-card p { color: var(--muted); font-size: 15px; }

        /* 新增创意版块：全场景永远在线 */
        .scenarios { padding: 80px 0; background: white; }
        .scenario-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 24px; }
        .scenario-card { background: #F8FAFD; border-radius: var(--radius); padding: 28px 20px; text-align: center; border: 1px solid #E7EDF5; transition: all 0.3s; }
        .scenario-card:hover { border-color: var(--accent); box-shadow: var(--card-shadow); transform: translateY(-5px); }
        .scenario-icon { font-size: 36px; margin-bottom: 12px; }
        .scenario-card h3 { font-size: 18px; margin-bottom: 8px; color: var(--primary); }
        .scenario-card p { color: var(--muted); font-size: 14px; }

        .servers { padding: 80px 0; background: white; }
        .server-map { background: var(--hero-gradient); border-radius: 20px; padding: 40px; color: white; margin-top: 10px; }
        .server-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 20px; margin-bottom: 28px; }
        .server-stat { text-align: center; padding: 20px; background: rgba(255,255,255,0.1); border-radius: 12px; }
        .server-stat .number { font-size: 34px; font-weight: bold; display: block; color: #fff; }
        .server-stat .label { font-size: 14px; opacity: 0.9; }
        .server-regions { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 15px; }
        .server-region { background: rgba(255,255,255,0.1); padding: 15px; border-radius: 8px; }
        .server-region h4 { margin-bottom: 8px; color: #fff; }
        .server-region ul { list-style: none; font-size: 14px; opacity: 0.9; }

        .trust { padding: 80px 0; background: #F0F4FA; }
        .trust-badges { display: flex; justify-content: center; gap: 30px; flex-wrap: wrap; margin-top: 20px; }
        .trust-badge { text-align: center; padding: 28px; background: white; border-radius: 12px; box-shadow: var(--card-shadow); min-width: 200px; }
        .trust-badge .icon { font-size: 46px; margin-bottom: 14px; }
        .trust-badge h3 { font-size: 17px; margin-bottom: 6px; color: var(--primary); }
        .trust-badge p { color: var(--muted); font-size: 14px; }

        .pricing { padding: 80px 0; background: white; }
        .pricing-toggle { display: flex; justify-content: center; gap: 10px; margin-bottom: 36px; }
        .pricing-toggle button { padding: 10px 25px; border: 2px solid var(--accent); background: white; color: var(--accent-dark); border-radius: 25px; cursor: pointer; font-weight: 600; }
        .pricing-toggle button.active { background: var(--accent); color: white; }
        .pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 28px; max-width: 800px; margin: 0 auto; }
        .pricing-card { background: #F8FAFD; border-radius: 16px; padding: 35px; text-align: center; border: 2px solid transparent; transition: all 0.3s; position: relative; }
        .pricing-card:hover { transform: translateY(-5px); box-shadow: var(--card-shadow); }
        .pricing-card.recommended { border-color: var(--accent); background: var(--hero-gradient); color: white; }
        .pricing-card.recommended .price { color: white; }
        .pricing-badge { position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--cta); color: white; padding: 5px 15px; border-radius: 15px; font-size: 12px; font-weight: 600; }
        .pricing-card h3 { font-size: 24px; margin-bottom: 10px; }
        .price { font-size: 40px; font-weight: bold; color: var(--accent-dark); margin: 18px 0; }
        .price span { font-size: 16px; font-weight: normal; }
        .feature-list { list-style: none; margin: 22px 0; text-align: left; }
        .feature-list li { padding: 9px 0; border-bottom: 1px solid rgba(0,0,0,0.05); display: flex; align-items: center; gap: 10px; color: var(--muted); }
        .feature-list li:before { content: '✓'; color: var(--accent); font-weight: bold; }
        .pricing-card.recommended .feature-list li { color: rgba(255,255,255,0.92); }
        .pricing-card.recommended .feature-list li:before { color: #FFD54F; }

        .news { padding: 80px 0; background: #F0F4FA; }
        .news-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 24px; }
        .news-card { background: white; border-radius: 12px; overflow: hidden; box-shadow: var(--card-shadow); transition: all 0.3s; display: flex; flex-direction: column; }
        .news-card:hover { transform: translateY(-5px); box-shadow: 0 15px 30px rgba(10,37,64,0.12); }
        .news-body { padding: 22px; }
        .news-meta { display: flex; gap: 12px; align-items: center; font-size: 13px; color: #8A9AA8; margin-bottom: 10px; }
        .news-tag { background: #E0F2F1; color: var(--accent-dark); padding: 2px 10px; border-radius: 4px; font-size: 12px; }
        .news-card h3 { font-size: 18px; margin-bottom: 10px; color: var(--primary); line-height: 1.4; }
        .news-card p { color: var(--muted); font-size: 14px; }

        .reviews { padding: 80px 0; background: white; }
        .reviews-container { position: relative; overflow: hidden; margin-top: 20px; }
        .reviews-track { display: flex; gap: 20px; animation: scroll 30s linear infinite; }
        .review-card { background: #F8FAFD; padding: 24px; border-radius: 12px; min-width: 300px; box-shadow: var(--card-shadow); }
        .review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
        .review-avatar { width: 40px; height: 40px; background: linear-gradient(135deg, #0A2540 0%, #00C2A8 100%); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: white; font-weight: bold; }
        .review-info h4 { font-size: 16px; margin-bottom: 2px; color: var(--primary); }
        .review-info .rating { color: #FFC107; font-size: 14px; }
        .review-text { color: var(--muted); font-size: 15px; line-height: 1.6; }
        @keyframes scroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }

        .faq { padding: 80px 0; background: #F0F4FA; }
        .faq-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(420px, 1fr)); gap: 20px; margin-top: 20px; }
        .faq-item { background: white; border-radius: 12px; overflow: hidden; box-shadow: var(--card-shadow); }
        .faq-question { padding: 20px; cursor: pointer; display: flex; justify-content: space-between; align-items: center; font-weight: 600; font-size: 16px; color: var(--primary); }
        .faq-question:hover { background: #F1F5FA; }
        .faq-question .arrow { transition: transform 0.3s; color: var(--accent-dark); }
        .faq-item.active .faq-question .arrow { transform: rotate(180deg); }
        .faq-answer { padding: 0 20px; max-height: 0; overflow: hidden; transition: all 0.35s; }
        .faq-item.active .faq-answer { padding: 0 20px 20px; max-height: 800px; }
        .faq-answer ol { padding-left: 20px; color: var(--muted); }
        .faq-answer ol li { margin-bottom: 10px; line-height: 1.7; }

        .download { padding: 80px 0; background: var(--hero-gradient); color: white; text-align: center; }
        .download h2 { font-size: 34px; margin-bottom: 14px; color: #fff; }
        .download p { font-size: 18px; margin-bottom: 36px; opacity: 0.9; }
        .download-platforms { display: flex; justify-content: center; gap: 18px; flex-wrap: wrap; }
        .download-btn { padding: 15px 28px; background: white; color: var(--primary); border-radius: 10px; text-decoration: none; font-weight: 600; display: flex; align-items: center; gap: 10px; transition: all 0.3s; }
        .download-btn:hover { transform: translateY(-3px); box-shadow: 0 10px 20px rgba(0,0,0,0.2); }
        .download-btn .icon { font-size: 24px; }

        footer { background: var(--footer-bg); color: white; padding: 60px 0 20px; }
        .footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 40px; margin-bottom: 36px; }
        .footer-col h3 { font-size: 18px; margin-bottom: 18px; color: var(--accent); }
        .footer-col ul { list-style: none; }
        .footer-col li { margin-bottom: 10px; }
        .footer-col a { color: var(--footer-text); text-decoration: none; transition: color 0.3s; }
        .footer-col a:hover { color: white; }
        .footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 20px; text-align: center; color: rgba(255,255,255,0.5); font-size: 14px; }
        .footer-bottom a { color: var(--footer-text); }
        #my-friend-links { margin-top: 20px; padding: 15px; background: rgba(255,255,255,0.05); border-radius: 8px; color: var(--footer-text); }
        #my-friend-links a { color: var(--footer-text); margin: 0 10px; text-decoration: none; }
        #my-friend-links a:hover { color: white; }

        @media (max-width: 768px) {
            .nav-links { display: none; }
            .mobile-menu-btn { display: block; }
            .hero-content { grid-template-columns: 1fr; gap: 40px; }
            .hero-text h1 { font-size: 32px; }
            .hero-stats { flex-wrap: wrap; gap: 15px; }
            .features-grid, .tech-grid, .pricing-grid, .faq-grid, .news-grid, .never-drop-grid, .scenario-grid { grid-template-columns: 1fr; }
            .server-stats { grid-template-columns: repeat(2, 1fr); }
            .download-platforms { flex-direction: column; align-items: center; }
            .download-btn { width: 100%; max-width: 300px; justify-content: center; }
        }