:root{
            --safe-primary:#0b5fff;
            --safe-primary-dark:#0847c4;
            --safe-accent:#00d4aa;
            --safe-dark:#0d1b2a;
            --safe-darker:#08111c;
            --safe-text:#1f2937;
            --safe-muted:#5b6b7c;
            --safe-bg:#ffffff;
            --safe-bg-alt:#f5f8ff;
            --safe-border:#e6ecf5;
            --safe-radius:20px;
            --safe-shadow:0 12px 30px rgba(11,95,255,.08);
            --safe-transition:.3s cubic-bezier(.4,0,.2,1);
            --font-sans:'Inter','PingFang SC','Microsoft YaHei','Segoe UI',sans-serif;
            /* 下载页额外变量 */
            --dl-accent:#f59e0b;
            --dl-accent-light:#fef3c7;
            --dl-gradient:linear-gradient(135deg,#0d1b2a 0%,#1e3a5f 100%);
        }
        *{margin:0;padding:0;box-sizing:border-box}
        html{scroll-behavior:smooth}
        body{font-family:var(--font-sans);color:var(--safe-text);background:var(--safe-bg);line-height:1.6;overflow-x:hidden}
        a{text-decoration:none;color:inherit}
        img{max-width:100%;display:block}
        .site{display:flex;flex-direction:column;min-height:100vh}
        .section-wrap{max-width:1200px;margin:0 auto;padding:0 24px}

        /* Header (与首页一致) */
        .site-header{background:rgba(255,255,255,.9);backdrop-filter:blur(12px);position:sticky;top:0;z-index:100;border-bottom:1px solid var(--safe-border)}
        .nav-shell{display:flex;align-items:center;justify-content:space-between;max-width:1200px;margin:0 auto;padding:12px 24px;gap:20px}
        .brand{display:flex;align-items:center;gap:8px;font-weight:800;font-size:1.5rem;color:var(--safe-dark);}
        .brand img{height:40px;width:auto}
        .main-nav{display:flex;align-items:center;gap:28px}
        .main-nav a{font-weight:600;color:var(--safe-text);position:relative;padding:6px 0;transition:var(--safe-transition)}
        .main-nav a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;background:var(--safe-primary);transition:var(--safe-transition)}
        .main-nav a:hover::after,.main-nav a.active::after{width:100%}
        .main-nav a.active{color:var(--safe-primary)}
        .menu-button{display:none;background:none;border:none;cursor:pointer;width:32px;height:32px;flex-direction:column;justify-content:center;gap:5px}
        .menu-button span{display:block;width:22px;height:2px;background:var(--safe-text);border-radius:2px;transition:var(--safe-transition)}

        /* 下载页 Hero 特有 */
        .dl-hero{background:var(--dl-gradient);color:#fff;padding:80px 0 70px;position:relative;overflow:hidden}
        .dl-hero::before{content:"";position:absolute;top:-20%;right:-10%;width:500px;height:500px;background:radial-gradient(circle,rgba(245,158,11,.2) 0%,transparent 70%);border-radius:50%;pointer-events:none}
        .dl-hero::after{content:"";position:absolute;bottom:-30%;left:-10%;width:400px;height:400px;background:radial-gradient(circle,rgba(0,212,170,.15) 0%,transparent 70%);border-radius:50%;pointer-events:none}
        .dl-hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:50px;align-items:center;position:relative;z-index:2}
        .dl-hero-kicker{display:inline-block;background:rgba(255,255,255,.1);backdrop-filter:blur(8px);color:#fcd34d;font-weight:700;font-size:14px;padding:8px 18px;border-radius:40px;margin-bottom:18px;letter-spacing:.5px}
        .dl-hero-heading{font-size:clamp(2.2rem,4.5vw,3.4rem);line-height:1.2;font-weight:800;margin-bottom:20px}
        .dl-hero-heading span{color:var(--safe-accent)}
        .dl-hero-text{font-size:1.15rem;color:rgba(255,255,255,.85);max-width:560px;margin-bottom:30px}
        .dl-hero-media img{border-radius:24px;box-shadow:0 30px 60px rgba(0,0,0,.3)}
		.download-buttons{
    display:flex;
    flex-wrap:wrap;
    gap:14px;
}

.download-button{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    gap:8px;
    font-weight:600;
    padding:12px 22px;
    border-radius:50px;
    border:1.5px solid transparent;   /* 添加边框，默认透明，但为内联样式提供基础 */
    transition:var(--safe-transition);
    box-shadow:0 8px 20px rgba(13,27,42,.15);
    cursor:pointer;
    text-align:center;
}

.download-button:hover{
    transform:translateY(-2px);
    box-shadow:0 12px 24px rgba(11,95,255,.25);
}

        /* 全平台下载卡片区 */
        .platform-section{padding:90px 0;background:var(--safe-bg)}
        .platform-section h2{font-size:clamp(1.8rem,3.5vw,2.6rem);font-weight:800;color:var(--safe-dark);text-align:center;margin-bottom:20px}
        .platform-subtitle{text-align:center;color:var(--safe-muted);max-width:700px;margin:0 auto 50px;font-size:1.05rem}
        .platform-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:28px}
        .platform-card{background:var(--safe-bg-alt);border:1px solid var(--safe-border);border-radius:var(--safe-radius);padding:32px 24px;text-align:center;transition:var(--safe-transition);display:flex;flex-direction:column;align-items:center;gap:14px}
        .platform-card:hover{transform:translateY(-8px);box-shadow:var(--safe-shadow);border-color:var(--dl-accent)}
        .platform-icon{font-size:3.5rem;line-height:1}
        .platform-card h3{font-size:1.4rem;font-weight:700;color:var(--safe-dark)}
        .platform-card p{color:var(--safe-muted);font-size:0.95rem;min-height:60px}
        .platform-btn{display:inline-flex;align-items:center;gap:8px;background:var(--safe-dark);color:#fff;font-weight:600;padding:10px 20px;border-radius:50px;transition:var(--safe-transition);margin-top:auto}
        .platform-btn:hover{background:var(--dl-accent);color:var(--safe-dark);transform:translateY(-2px)}
        .platform-version{font-size:0.85rem;color:var(--safe-muted);margin-top:-8px}

        /* 版本更新节奏 */
        .version-section{padding:90px 0;background:var(--safe-bg-alt)}
        .version-section h2{font-size:clamp(1.8rem,3.5vw,2.6rem);font-weight:800;color:var(--safe-dark);text-align:center;margin-bottom:30px}
        .version-timeline{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;max-width:900px;margin:0 auto}
        .version-item{background:#fff;border-radius:16px;padding:24px;min-width:220px;flex:1;border:1px solid var(--safe-border);transition:var(--safe-transition)}
        .version-item:hover{box-shadow:var(--safe-shadow)}
        .version-number{font-weight:800;font-size:1.6rem;color:var(--dl-accent)}
        .version-date{color:var(--safe-muted);font-size:0.9rem;margin:8px 0}
        .version-feature{color:var(--safe-text);font-weight:600;font-size:0.95rem}

        /* 设备对比创意区块 */
        .compare-section{padding:90px 0;background:var(--safe-bg)}
        .compare-section h2{font-size:clamp(1.8rem,3.5vw,2.6rem);font-weight:800;color:var(--safe-dark);text-align:center;margin-bottom:50px}
        .compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:stretch}
        .compare-card{background:var(--safe-bg-alt);border-radius:var(--safe-radius);padding:36px 28px;border:1px solid var(--safe-border);transition:var(--safe-transition)}
        .compare-card:hover{transform:translateY(-6px);box-shadow:var(--safe-shadow)}
        .compare-card.desk{background:linear-gradient(145deg,#f0f6ff 0%,#ffffff 100%);}
        .compare-card.mobile{background:linear-gradient(145deg,#fefce8 0%,#ffffff 100%);}
        .compare-icon{font-size:3rem;margin-bottom:16px}
        .compare-card h3{font-size:1.6rem;font-weight:700;color:var(--safe-dark);margin-bottom:16px}
        .compare-list{list-style:none}
        .compare-list li{display:flex;gap:10px;align-items:flex-start;margin-bottom:12px;color:var(--safe-text);font-weight:500}
        .compare-list li::before{content:"✓";color:var(--safe-accent);font-weight:800;flex-shrink:0;margin-top:2px}

        /* 同步演示 */
        .sync-section{padding:90px 0;background:var(--safe-bg-alt)}
        .sync-section h2{font-size:clamp(1.8rem,3.5vw,2.6rem);font-weight:800;color:var(--safe-dark);text-align:center;margin-bottom:20px}
        .sync-subtitle{text-align:center;color:var(--safe-muted);max-width:700px;margin:0 auto 50px;font-size:1.05rem}
        .sync-diagram{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:20px}
        .sync-device{background:#fff;border:1px solid var(--safe-border);border-radius:16px;padding:20px 28px;text-align:center;min-width:140px;transition:var(--safe-transition)}
        .sync-device:hover{transform:translateY(-4px);box-shadow:var(--safe-shadow)}
        .sync-device-icon{font-size:2.5rem}
        .sync-arrow{font-size:2rem;color:var(--safe-muted)}
        .sync-center{background:var(--safe-dark);color:#fff;border-radius:16px;padding:20px 28px;text-align:center;min-width:160px}
        .sync-center h3{color:#fff;font-size:1.2rem;margin-bottom:8px}

        /* 安全承诺 */
        .promise-section{padding:90px 0;background:var(--safe-bg)}
        .promise-section h2{font-size:clamp(1.8rem,3.5vw,2.6rem);font-weight:800;color:var(--safe-dark);text-align:center;margin-bottom:50px}
        .promise-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:28px}
        .promise-card{background:var(--safe-bg-alt);border-radius:var(--safe-radius);padding:32px 24px;text-align:center;border:1px solid var(--safe-border);transition:var(--safe-transition)}
        .promise-card:hover{transform:translateY(-5px);box-shadow:var(--safe-shadow)}
        .promise-icon{font-size:2.5rem;margin-bottom:16px}
        .promise-card h3{font-size:1.3rem;font-weight:700;color:var(--safe-dark);margin-bottom:10px}
        .promise-card p{color:var(--safe-muted);font-size:0.95rem}

        /* 用户评价 */
        .voice-section{padding:90px 0;background:var(--safe-bg-alt)}
        .section-heading-row{display:flex;align-items:center;justify-content:space-between;margin-bottom:40px}
        .section-heading-row h2{font-size:clamp(1.8rem,3.5vw,2.6rem);font-weight:800;color:var(--safe-dark)}
        .arrow-pair span{display:inline-flex;width:44px;height:44px;border-radius:50%;background:#fff;border:1px solid var(--safe-border);align-items:center;justify-content:center;font-size:1.5rem;cursor:pointer;margin-left:10px;transition:var(--safe-transition)}
        .arrow-pair span:hover{background:var(--safe-primary);color:#fff;border-color:var(--safe-primary)}
        .testimonial-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:28px}
        .testimonial-card{background:#fff;border-radius:var(--safe-radius);padding:28px 24px;box-shadow:0 6px 18px rgba(0,0,0,.04);border:1px solid var(--safe-border)}
        .person{display:flex;align-items:center;gap:12px;margin-bottom:16px}
        .avatar-icon{width:44px;height:44px;border-radius:50%;background:var(--dl-accent-light);display:flex;align-items:center;justify-content:center;font-size:24px;flex-shrink:0}
        .person strong{font-size:1.05rem;color:var(--safe-dark)}
        .testimonial-card p{color:var(--safe-muted);font-size:.95rem}

        /* FAQ */
        .faq-section{padding:90px 0;background:var(--safe-bg)}
        .faq-section h2{font-size:clamp(1.8rem,3.5vw,2.6rem);font-weight:800;color:var(--safe-dark);text-align:center;margin-bottom:50px}
        .faq-list{max-width:800px;margin:0 auto}
        .faq-item{border-bottom:1px solid var(--safe-border);padding:20px 0}
        .faq-question{font-weight:700;color:var(--safe-dark);font-size:1.1rem;cursor:pointer;display:flex;justify-content:space-between;align-items:center}
        .faq-question::after{content:"+";font-size:1.5rem;color:var(--safe-muted)}
        .faq-answer{color:var(--safe-muted);margin-top:10px;display:none}
        .faq-item.active .faq-answer{display:block}
        .faq-item.active .faq-question::after{content:"−"}

        /* 底部下载区 */
        .final-download{padding:90px 0;background:var(--dl-gradient);color:#fff}
        .final-download-grid{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center}
        .final-download-copy h2{font-size:clamp(1.8rem,3.5vw,2.6rem);font-weight:800;margin-bottom:26px}
        .final-download-copy .download-buttons{display:flex;flex-wrap:wrap;gap:14px}
        .final-download-copy .download-button{display:inline-flex;align-items:center;gap:8px;background:#fff;color:var(--safe-dark);font-weight:600;padding:12px 22px;border-radius:50px;transition:var(--safe-transition);box-shadow:0 10px 30px rgba(0,0,0,.3)}
        .final-download-copy .download-button:hover{background:var(--safe-accent);color:var(--safe-dark);transform:translateY(-2px)}
        .final-download-media img{border-radius:24px;box-shadow:0 30px 60px rgba(0,0,0,.3)}

        /* Footer (与首页一致) */
        .site-footer{background:var(--safe-darker);color:#aebdce;padding:60px 0 20px}
        .footer-wrap{max-width:1200px;margin:0 auto;padding:0 24px}
        .footer-logo{display:flex;align-items:center;gap:8px;font-weight:800;font-size:1.5rem;color:#fff;margin-bottom:32px;}
        .footer-logo img{height:40px;margin-bottom:0;}
        .footer-cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:32px;margin-bottom:40px}
        .footer-cols h2{font-size:1.1rem;font-weight:700;color:#fff;margin-bottom:16px}
        .footer-cols p{display:flex;flex-direction:column;gap:8px}
        .footer-cols a{color:#aebdce;transition:var(--safe-transition)}
        .footer-cols a:hover{color:var(--safe-primary)}
        .footer-cols .mail-link{color:var(--safe-accent)}
        .site-footer small{display:block;text-align:center;padding-top:20px;border-top:1px solid rgba(255,255,255,.08);color:#64748b;font-size:.85rem}

        /* Responsive */
        @media(max-width:900px){
            .dl-hero-grid,.final-download-grid,.compare-grid{grid-template-columns:1fr;text-align:center}
            .dl-hero-text{margin-left:auto;margin-right:auto}
            .download-buttons{justify-content:center}
            .dl-hero-media img{margin:0 auto}
        }
        @media(max-width:768px){
            .main-nav{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;flex-direction:column;padding:20px;box-shadow:0 20px 40px rgba(0,0,0,.08);border-bottom:1px solid var(--safe-border);gap:12px}
            .main-nav.open{display:flex}
            .menu-button{display:flex}
            .nav-shell{flex-wrap:wrap}
            .sync-diagram{flex-direction:column}
            .sync-arrow{transform:rotate(90deg)}
        }