:root{
            --brand-primary:#2563EB;
            --brand-primary-hover:#1D4ED8;
            --brand-cyan:#06B6D4;
            --brand-violet:#7C3AED;
            --brand-deep:#0B1220;
            --brand-navy:#0F2A4A;
            --bg-page:#F8FAFC;
            --bg-card:#FFFFFF;
            --bg-muted:#F1F5F9;
            --border:#E2E8F0;
            --text-primary:#0F172A;
            --text-secondary:#475569;
            --text-muted:#64748B;
            --success:#10B981;
            --warning:#F59E0B;
            --danger:#EF4444;
            --info:#0EA5E9;
            --radius-btn:12px;
            --radius-card:16px;
            --radius-section:24px;
            --shadow-card:0 8px 24px rgba(15,23,42,.08);
            --shadow-hover:0 16px 40px rgba(15,23,42,.14);
            --container:1200px;
            --header-h:72px;
        }

        *,*::before,*::after{box-sizing:border-box}
        html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;scroll-padding-top:96px}
        body{
            margin:0;
            font-family:"Inter","PingFang SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
            font-size:16px;
            line-height:1.75;
            color:var(--text-primary);
            background:var(--bg-page);
            -webkit-font-smoothing:antialiased;
        }
        h1,h2,h3,h4{margin:0;line-height:1.25;font-weight:700;letter-spacing:-.01em}
        p{margin:0}
        ul,ol{margin:0;padding:0;list-style:none}
        img{max-width:100%;display:block}
        a{color:var(--brand-primary);text-decoration:none;transition:color .2s}
        a:hover{color:var(--brand-primary-hover)}
        button{font-family:inherit}
        :focus-visible{outline:2px solid var(--brand-primary);outline-offset:3px;border-radius:6px}

        .container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px}
        .section{padding:80px 0}
        .section--soft{background:var(--bg-muted)}

        .btn{
            display:inline-flex;align-items:center;justify-content:center;gap:10px;
            height:52px;padding:0 28px;border:1px solid transparent;border-radius:var(--radius-btn);
            font-size:16px;font-weight:600;line-height:1;cursor:pointer;white-space:nowrap;
            transition:transform .18s ease,box-shadow .18s ease,background .18s ease,color .18s ease,border-color .18s ease;
        }
        .btn i{font-size:15px}
        .btn-primary{background:var(--brand-primary);color:#fff;box-shadow:0 6px 18px rgba(37,99,235,.24)}
        .btn-primary:hover{background:var(--brand-primary-hover);color:#fff;transform:translateY(-2px);box-shadow:0 12px 28px rgba(37,99,235,.32)}
        .btn-outline{background:transparent;color:var(--text-primary);border-color:var(--border)}
        .btn-outline:hover{background:var(--bg-muted);border-color:#CBD5E1;color:var(--text-primary)}
        .btn-sm{height:44px;padding:0 20px;font-size:14px}
        .btn-block{width:100%}

        .section-head{max-width:760px;margin:0 auto 48px;text-align:center}
        .eyebrow{
            display:inline-flex;align-items:center;gap:8px;
            padding:6px 14px;margin-bottom:18px;border-radius:999px;
            background:#EFF6FF;color:var(--brand-primary);
            font-size:13px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;
        }
        .h2{font-size:clamp(26px,3.2vw,32px);color:var(--text-primary)}
        .section-sub{margin-top:16px;font-size:16px;color:var(--text-secondary)}

        .site-header{
            position:fixed;inset:0 0 auto 0;z-index:100;height:var(--header-h);
            transition:background .28s ease,box-shadow .28s ease,border-color .28s ease;
            border-bottom:1px solid transparent;
        }
        .header-inner{display:flex;align-items:center;justify-content:space-between;height:100%;gap:24px}
        .brand{display:inline-flex;align-items:center;gap:10px;font-size:19px;font-weight:700;color:#fff;letter-spacing:.01em}
        .brand:hover{color:#fff}
        .brand-mark{
            width:34px;height:34px;border-radius:8px;object-fit:contain;
            background:rgba(255,255,255,.12);
            box-shadow:0 6px 16px rgba(6,182,212,.28);
        }
        .nav{display:flex;align-items:center;gap:4px}
        .nav a{
            display:inline-block;padding:8px 14px;border-radius:10px;
            color:rgba(255,255,255,.82);font-size:15px;font-weight:500;transition:.2s;
        }
        .nav a:hover{color:#fff;background:rgba(255,255,255,.1)}
        .header-actions{display:flex;align-items:center;gap:12px}
        .header-actions .btn-sm{box-shadow:0 6px 16px rgba(37,99,235,.35)}
        .nav-toggle{
            display:none;width:44px;height:44px;border-radius:12px;border:1px solid rgba(255,255,255,.24);
            background:rgba(255,255,255,.08);color:#fff;font-size:18px;cursor:pointer;
        }
        .site-header.scrolled{
            background:rgba(255,255,255,.94);backdrop-filter:saturate(180%) blur(12px);
            border-bottom-color:var(--border);box-shadow:0 4px 20px rgba(15,23,42,.06);
        }
        .site-header.scrolled .brand{color:var(--text-primary)}
        .site-header.scrolled .nav a{color:var(--text-secondary)}
        .site-header.scrolled .nav a:hover{color:var(--brand-primary);background:#EFF6FF}
        .site-header.scrolled .nav-toggle{color:var(--text-primary);border-color:var(--border);background:#fff}
        .site-header.scrolled .brand-mark{background:rgba(37,99,235,.08)}

        .faq-item{
            background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-card);
            margin-bottom:14px;overflow:hidden;transition:border-color .2s,box-shadow .2s;
        }
        .faq-item[open]{border-color:#BFDBFE;box-shadow:var(--shadow-card)}
        .faq-item summary{
            display:flex;align-items:center;justify-content:space-between;gap:16px;
            padding:20px 24px;cursor:pointer;list-style:none;
            font-size:16px;font-weight:600;color:var(--text-primary);
        }
        .faq-item summary::-webkit-details-marker{display:none}
        .faq-icon{
            flex:0 0 auto;width:26px;height:26px;display:grid;place-items:center;
            border-radius:50%;background:#EFF6FF;color:var(--brand-primary);
            font-size:12px;transition:transform .25s ease,background .25s;
        }
        .faq-item[open] .faq-icon{transform:rotate(180deg);background:var(--brand-primary);color:#fff}
        .faq-a{padding:0 24px 22px;color:var(--text-secondary);font-size:15px;line-height:1.8}

        .support-fab{
            position:fixed;right:24px;bottom:24px;z-index:90;
            display:inline-flex;align-items:center;gap:10px;height:54px;padding:0 20px;
            border-radius:999px;background:var(--brand-deep);color:#fff;font-size:15px;font-weight:600;
            box-shadow:0 12px 32px rgba(11,18,32,.32);transition:.2s;
        }
        .support-fab:hover{color:#fff;transform:translateY(-2px);box-shadow:0 16px 40px rgba(11,18,32,.4)}
        .support-fab .dot{width:9px;height:9px;border-radius:50%;background:var(--success);box-shadow:0 0 0 4px rgba(16,185,129,.22)}

        .site-footer{background:var(--brand-deep);color:rgba(255,255,255,.68);padding:72px 0 32px;font-size:14px}
        .footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:48px;padding-bottom:48px;border-bottom:1px solid rgba(255,255,255,.1)}
        .footer-brand .brand{color:#fff;margin-bottom:16px}
        .footer-brand p{max-width:320px;color:rgba(255,255,255,.6);line-height:1.9}
        .footer-col h4{font-size:14px;color:#fff;margin-bottom:16px;letter-spacing:.04em}
        .footer-col li{margin-bottom:11px}
        .footer-col a{color:rgba(255,255,255,.66)}
        .footer-col a:hover{color:#fff}
        .footer-bottom{padding-top:28px;display:flex;flex-wrap:wrap;gap:12px 24px;justify-content:space-between;color:rgba(255,255,255,.45);font-size:13px}
        .footer-bottom p{max-width:720px}

        @media (max-width:1024px){
            .nav{display:none}
            .nav-toggle{display:grid;place-items:center}
            .header-actions .btn-sm{display:none}
            .nav.open{
                display:flex;flex-direction:column;align-items:stretch;gap:4px;
                position:absolute;top:var(--header-h);left:16px;right:16px;
                background:#fff;border:1px solid var(--border);border-radius:var(--radius-card);
                padding:12px;box-shadow:var(--shadow-hover);
            }
            .nav.open a{color:var(--text-secondary);padding:12px 16px}
            .nav.open a:hover{background:#EFF6FF;color:var(--brand-primary)}
        }
        @media (max-width:768px){
            .section{padding:64px 0}
            .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
            .footer-brand{grid-column:1/-1}
            .support-fab{right:16px;bottom:16px;height:48px;padding:0 16px;font-size:14px}
        }
        @media (max-width:480px){
            .footer-grid{grid-template-columns:1fr}
            .btn{height:50px;padding:0 22px;font-size:15px}
        }
        @media (prefers-reduced-motion:reduce){
            *{animation:none !important;transition:none !important}
            html{scroll-behavior:auto}
        }

.page-download .hero-download{
            position:relative;overflow:hidden;
            padding:calc(var(--header-h) + 72px) 0 80px;
            background:
                radial-gradient(900px 520px at 82% 8%,rgba(6,182,212,.24),transparent 62%),
                linear-gradient(135deg,#0B1220 0%,#0F2A4A 60%,#1E3A8A 100%);
            color:#fff;text-align:center;
        }
        .page-download .hero-download::after{
            content:"";position:absolute;inset:0;pointer-events:none;
            background-image:radial-gradient(rgba(255,255,255,.1) 1px,transparent 1px);
            background-size:32px 32px;opacity:.4;
        }
        .page-download .hero-download .container{position:relative;z-index:1}
        .page-download .hero-download h1{font-size:clamp(32px,4.2vw,48px);letter-spacing:-.02em;margin-bottom:20px}
        .page-download .hero-download .hero-sub{max-width:820px;margin:0 auto;font-size:17px;color:rgba(255,255,255,.8);line-height:1.8}
        .page-download .hero-download .hero-note{
            display:inline-flex;align-items:center;gap:8px;margin-top:24px;
            padding:8px 18px;border-radius:999px;background:rgba(16,185,129,.15);
            border:1px solid rgba(16,185,129,.3);color:#34D399;font-size:14px;font-weight:500;
        }

        .page-download .detect-section{margin-top:-40px;position:relative;z-index:10;padding-bottom:64px;}
        .page-download .detect-panel{
            background:var(--bg-card); border:1px solid var(--border);
            border-radius:var(--radius-section); box-shadow:var(--shadow-hover);
            display:grid; grid-template-columns: 1fr 240px; gap:0; overflow:hidden;
        }
        .page-download .detect-main{ padding:48px; }
        .page-download .detect-main h2{ font-size:24px; margin-bottom:8px; }
        .page-download .detect-main p{ font-size:15px; color:var(--text-secondary); margin-bottom:32px; }
        .page-download .platform-grid{ display:grid; grid-template-columns:1fr 1fr; gap:16px; }
        .page-download .platform-item{
            display:flex; align-items:center; justify-content:space-between; padding:16px 20px;
            border:1px solid var(--border); border-radius:var(--radius-card); transition:0.2s;
        }
        .page-download .platform-item:hover{ border-color:#BFDBFE; background:var(--bg-page); }
        .page-download .platform-info{ display:flex; align-items:center; gap:12px; }
        .page-download .platform-info i{ font-size:24px; color:var(--text-primary); }
        .page-download .platform-info strong{ display:block; font-size:15px; }
        .page-download .platform-info span{ font-size:12px; color:var(--text-muted); }
        .page-download .platform-item .btn-sm{ height:36px; padding:0 16px; font-size:13px; }

        .page-download .detect-side{
            background:var(--bg-muted); border-left:1px solid var(--border);
            padding:48px 32px; display:flex; flex-direction:column; align-items:center; text-align:center;
        }
        .page-download .qr-placeholder img{ width:120px; height:120px; border-radius:12px; margin-bottom:16px; border:1px solid var(--border);}
        .page-download .detect-side h3{ font-size:16px; margin-bottom:8px; }
        .page-download .detect-side p{ font-size:13px; color:var(--text-muted); margin-bottom:16px; }
        .page-download .copy-link{ font-size:13px; color:var(--brand-primary); cursor:pointer; font-weight:600; text-decoration:underline;}

        .page-download .install-tabs-section{background: var(--bg-card); padding: 80px 0; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);}
        .page-download .tabs-layout{display: grid; grid-template-columns: 240px 1fr; gap: 48px;}
        .page-download .tabs-nav{display: flex; flex-direction: column; gap: 8px;}
        .page-download .tab-btn{
            text-align: left; padding: 16px 20px; border-radius: 12px; border: 1px solid transparent;
            background: transparent; color: var(--text-secondary); font-size: 15px; font-weight: 600;
            cursor: pointer; transition: 0.2s; display: flex; align-items: center; gap: 12px;
        }
        .page-download .tab-btn:hover{background: var(--bg-muted);}
        .page-download .tab-btn.active{background: #EFF6FF; color: var(--brand-primary); border-color: #BFDBFE;}
        .page-download .tab-btn i{width: 20px; text-align: center; font-size: 18px;}
        .page-download .tab-content{display: none; background: var(--bg-page); border: 1px solid var(--border); border-radius: var(--radius-card); padding: 40px;}
        .page-download .tab-content.active{display: block;}
        .page-download .tab-content h3{font-size: 22px; margin-bottom: 24px;}
        .page-download .tab-content ol{counter-reset: custom-counter;}
        .page-download .tab-content li{
            position: relative; padding-left: 44px; margin-bottom: 20px;
            font-size: 15px; color: var(--text-secondary); line-height: 1.7;
        }
        .page-download .tab-content li::before{
            counter-increment: custom-counter; content: counter(custom-counter);
            position: absolute; left: 0; top: 0; width: 28px; height: 28px;
            background: var(--brand-primary); color: #fff; border-radius: 50%;
            display: grid; place-items: center; font-size: 14px; font-weight: 700;
        }
        .page-download .tab-content code{background: #E2E8F0; padding: 2px 6px; border-radius: 4px; font-family: monospace; font-size: 13px;}

        .page-download .trial-section{ padding: 80px 0; background: var(--bg-muted); }
        .page-download .trial-box{
            background: #fff; border: 1px solid #BFDBFE; border-radius: var(--radius-section); padding: 48px;
            display: flex; align-items: center; justify-content: space-between; gap: 40px;
            box-shadow: 0 12px 32px rgba(37,99,235,.06);
        }
        .page-download .trial-box-text h2{ font-size: 28px; margin-bottom: 12px; color: var(--brand-primary); }
        .page-download .trial-box-text p{ font-size: 15px; color: var(--text-secondary); line-height: 1.8; }
        .page-download .trial-rules{ display: flex; gap: 24px; margin-top: 20px; }
        .page-download .trial-rules li{ display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--text-primary); font-weight: 500; }
        .page-download .trial-rules i{ color: var(--success); }

        .page-download .features-grid{display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;}
        .page-download .feature-card{background: var(--bg-card); padding: 32px; border-radius: var(--radius-card); border: 1px solid var(--border); text-align: center;}
        .page-download .feature-icon{width: 48px; height: 48px; margin: 0 auto 16px; background: #EFF6FF; color: var(--brand-primary); border-radius: 50%; display: grid; place-items: center; font-size: 20px;}
        .page-download .feature-card h4{font-size: 18px; margin-bottom: 12px;}
        .page-download .feature-card p{font-size: 14px; color: var(--text-secondary);}

        .page-download .safety-box{background: var(--brand-deep); color: #fff; border-radius: var(--radius-section); padding: 48px; display: flex; align-items: center; gap: 48px;}
        .page-download .safety-box img{width: 300px; border-radius: var(--radius-card);}
        .page-download .safety-text h3{font-size: 24px; margin-bottom: 16px;}
        .page-download .safety-text p{font-size: 15px; color: rgba(255,255,255,.7); line-height: 1.8; margin-bottom: 24px;}
        .page-download .safety-list li{display: flex; gap: 12px; margin-bottom: 12px; font-size: 14px; color: rgba(255,255,255,.9);}
        .page-download .safety-list i{color: var(--success); margin-top: 4px;}
        .page-download .safety-list a { color: #67E8F9; text-decoration: underline; }

        .page-download .req-table{width: 100%; border-collapse: collapse; font-size: 15px; background: #fff; border-radius: var(--radius-card); overflow: hidden; box-shadow: var(--shadow-card);}
        .page-download .req-table th, .page-download .req-table td{padding: 16px 20px; border-bottom: 1px solid var(--border); text-align: left;}
        .page-download .req-table thead th{background: var(--bg-muted); font-weight: 700; color: var(--text-primary);}
        .page-download .req-table tbody th{font-weight: 600; color: var(--text-secondary); background: var(--bg-page);}
        .page-download .req-table tbody tr:last-child th, .page-download .req-table tbody tr:last-child td{border-bottom: none;}

        .page-download .review-grid{display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;}
        .page-download .review-card{background: var(--bg-card); padding: 32px; border-radius: var(--radius-card); border: 1px solid var(--border);}
        .page-download .stars{color: var(--warning); font-size: 14px; margin-bottom: 12px;}
        .page-download .review-text{font-size: 15px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 20px; font-style: italic;}
        .page-download .review-author{display: flex; align-items: center; gap: 12px;}
        .page-download .avatar{width: 36px; height: 36px; border-radius: 50%; background: #EFF6FF; color: var(--brand-primary); display: grid; place-items: center; font-weight: 700;}
        .page-download .author-info strong{display: block; font-size: 14px;}
        .page-download .author-info span{font-size: 12px; color: var(--text-muted);}

        .page-download .faq-wrap{display: grid; grid-template-columns: 1fr 1fr; gap: 0 24px; width: 100%; margin: 0 auto;}
        .page-download .faq-cta{text-align: center; margin-top: 40px;}

        .page-download .final-cta{
            position: relative; overflow: hidden; color: #fff; text-align: center; padding: 80px 0;
            background: linear-gradient(120deg,#1D4ED8 0%,#2563EB 45%,#0891B2 100%);
        }
        .page-download .final-cta::before{
            content: ""; position: absolute; inset: 0;
            background-image: radial-gradient(rgba(255,255,255,.16) 1px, transparent 1px);
            background-size: 28px 28px; opacity: .55;
        }
        .page-download .final-cta .container{position: relative; z-index: 1;}
        .page-download .final-cta h2{font-size: clamp(28px,3.6vw,36px); color: #fff;}
        .page-download .final-cta p{max-width: 640px; margin: 16px auto 0; font-size: 16px; color: rgba(255,255,255,.84);}
        .page-download .final-actions{display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; margin-top: 32px;}
        .page-download .final-actions .btn-primary{background: #fff; color: var(--brand-primary); box-shadow: 0 12px 32px rgba(2,6,23,.24);}
        .page-download .final-actions .btn-primary:hover{background: #F1F5F9; color: var(--brand-primary-hover);}

        @media (max-width: 1024px) {
            .page-download .detect-panel { grid-template-columns: 1fr; }
            .page-download .detect-side { border-left: none; border-top: 1px solid var(--border); padding: 32px; }
            .page-download .review-grid { grid-template-columns: 1fr 1fr; }
            .page-download .safety-box { flex-direction: column; text-align: center; }
            .page-download .safety-box img { display: none; }
        }
        @media (max-width: 900px) {
            .page-download .platform-grid { grid-template-columns: 1fr; }
            .page-download .tabs-layout { grid-template-columns: 1fr; gap: 24px; }
            .page-download .tabs-nav { flex-direction: row; overflow-x: auto; padding-bottom: 8px; }
            .page-download .tab-btn { white-space: nowrap; }
            .page-download .trial-box { flex-direction: column; text-align: center; padding: 32px; }
            .page-download .trial-rules { flex-direction: column; align-items: center; gap: 12px; }
            .page-download .features-grid { grid-template-columns: 1fr; }
            .page-download .review-grid { grid-template-columns: 1fr; }
            .page-download .faq-wrap { grid-template-columns: 1fr; }
            .page-download .req-table { display: block; overflow-x: auto; white-space: nowrap; }
        }