:root { --primary: rgb(3,105,161); --primary-hover: rgb(2,85,130); --primary-light: rgba(3,105,161, 0.08); --text-main: #1e293b; --text-muted: #64748b; --bg-body: #f8fafc; --radius: 12px; --shadow-sm: 0 1px 3px rgba(0,0,0,0.1); --shadow-md: 0 10px 25px -5px rgba(0,0,0,0.05); --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1); }
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: "PingFang SC", "Microsoft YaHei", sans-serif; color: var(--text-main); background: #fff; line-height: 1.6; }
        a { text-decoration: none; color: inherit; transition: var(--transition); }
        ul, ol { list-style: none; }
        img { max-width: 100%; height: auto; display: block; }
        .container { width: 100%; max-width: 1240px; margin: 0 auto; padding: 0 24px; }
        
        .logo { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; }
        .logo img { display: block; height: 44px; width: auto; max-width: 180px; object-fit: contain; flex-shrink: 0; }
        .logo span { display: inline-block; font-size: 22px; font-weight: 800; line-height: 1; color: var(--primary); white-space: nowrap; }

        .site-header { background: rgba(255,255,255,0.95); backdrop-filter: blur(10px); position: sticky; top: 0; z-index: 100; border-bottom: 1px solid rgba(226,232,240,0.8); }
        .site-header.scrolled { box-shadow: var(--shadow-sm); }
        .header-inner { display: flex; align-items: center; justify-content: space-between; height: 80px; }
        .desktop-nav ul { display: flex; gap: 32px; }
        .desktop-nav a { font-weight: 500; font-size: 16px; color: #334155; position: relative; padding: 8px 0; }
        .desktop-nav a:hover { color: var(--primary); }
        .desktop-nav a::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px; background: var(--primary); transition: var(--transition); }
        .desktop-nav a:hover::after { width: 100%; }
        .header-actions { display: flex; gap: 20px; align-items: center;}
        
        .btn { display: inline-flex; align-items: center; justify-content: center; padding: 14px 32px; border-radius: 50px; font-weight: 600; cursor: pointer; transition: var(--transition); font-size: 16px; }
        .btn-primary { background: var(--primary); color: #fff; border: 2px solid var(--primary); box-shadow: 0 4px 15px rgba(3,105,161,0.3); }
        .btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); transform: translateY(-2px); color: #fff;}

        .mobile-toggle { display: none; background: none; border: none; flex-direction: column; gap: 6px; cursor: pointer; padding: 5px; }
        .mobile-toggle span { display: block; width: 26px; height: 2px; background: var(--text-main); transition: var(--transition); }
        .mobile-drawer { position: fixed; inset: 0; z-index: 999; pointer-events: none; }
        .drawer-overlay { position: absolute; inset: 0; background: rgba(15,23,42,0.6); opacity: 0; transition: opacity 0.3s; }
        .drawer-content { position: absolute; top: 0; left: -320px; bottom: 0; width: 300px; background: #fff; transition: transform 0.4s; display: flex; flex-direction: column; }
        .mobile-drawer.active { pointer-events: auto; }
        .mobile-drawer.active .drawer-overlay { opacity: 1; }
        .mobile-drawer.active .drawer-content { transform: translateX(320px); }
        .drawer-header { display: flex; align-items: center; justify-content: space-between; padding: 24px; border-bottom: 1px solid var(--border-color); background: #f8fafc; }
        .drawer-close { background: #e2e8f0; border: none; width: 32px; height: 32px; border-radius: 50%; font-size: 20px; cursor: pointer; display: flex; align-items: center; justify-content: center;}
        .drawer-nav { padding: 24px 0; flex: 1; overflow-y: auto; }
        .drawer-nav ul li a { display: block; padding: 16px 32px; border-bottom: 1px solid #f1f5f9; color: #334155; font-weight: 500;}
        .drawer-footer { padding: 24px; border-top: 1px solid var(--border-color); }
        @media (max-width: 992px) { .desktop-nav, .header-actions .btn { display: none; } .mobile-toggle { display: flex; } .logo span { font-size: 18px; } .logo img { height: 36px; } }

        
        .dl-hero { padding: 100px 0; background: linear-gradient(to right, #f8fafc, #e0f2fe); position: relative; overflow: hidden; }
        .dl-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 60px; align-items: center; }
        .dl-content h1 { font-size: 48px; font-weight: 800; color: #0f172a; margin-bottom: 20px; line-height: 1.2; }
        .dl-content h1 span { color: var(--primary); }
        .dl-content p { font-size: 18px; color: #475569; margin-bottom: 40px; line-height: 1.8; }
        
        .dl-box { background: #fff; padding: 30px; border-radius: 20px; box-shadow: var(--shadow-md); display: inline-flex; gap: 30px; align-items: center; border: 1px solid var(--border-color); }
        .qr-placeholder { width: 120px; height: 120px; background: #f1f5f9; border-radius: 10px; border: 2px dashed #cbd5e1; display: flex; align-items: center; justify-content: center; flex-direction: column; color: var(--text-muted); font-size: 12px; }
        .qr-placeholder svg { width: 32px; height: 32px; margin-bottom: 8px; color: var(--primary); }
        .dl-buttons { display: flex; flex-direction: column; gap: 15px; }
        .dl-btn { display: flex; align-items: center; gap: 12px; padding: 12px 24px; border-radius: 10px; font-weight: 600; background: #f8fafc; border: 1px solid #e2e8f0; cursor: pointer; transition: var(--transition); min-width: 200px; justify-content: center; color: #0f172a; }
        .dl-btn:hover { background: var(--primary-light); border-color: var(--primary); color: var(--primary); }
        .dl-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }
        .dl-btn svg { width: 24px; height: 24px; }

        .dl-img-wrap { position: relative; display: flex; justify-content: center; }
        
        .phone-mockup { width: 280px; height: 580px; background: #0f172a; border-radius: 40px; border: 10px solid #cbd5e1; box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25); position: relative; overflow: hidden; display: flex; align-items: center; justify-content: center; color: #fff; text-align: center; }
        .phone-mockup::before { content: ''; position: absolute; top: 0; left: 50%; transform: translateX(-50%); width: 120px; height: 25px; background: #cbd5e1; border-bottom-left-radius: 15px; border-bottom-right-radius: 15px; }
        .phone-inner { background: linear-gradient(135deg, var(--primary), #0ea5e9); width: 100%; height: 100%; display: flex; flex-direction: column; padding: 40px 20px; }
        .phone-inner h4 { font-size: 24px; font-weight: 800; margin-bottom: 20px; margin-top: 40px; }

        .dl-steps { padding: 100px 0; background: #fff; text-align: center; }
        .dl-steps h2 { font-size: 32px; font-weight: 800; margin-bottom: 60px; }
        .step-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
        .step-card { padding: 40px 30px; background: var(--bg-body); border-radius: var(--radius); position: relative; }
        .step-num { position: absolute; top: -25px; left: 50%; transform: translateX(-50%); width: 50px; height: 50px; background: var(--primary); color: #fff; font-size: 24px; font-weight: 800; border-radius: 50%; display: flex; align-items: center; justify-content: center; border: 4px solid #fff; }
        .step-card h3 { font-size: 20px; font-weight: 700; margin-top: 15px; margin-bottom: 10px; }
        .step-card p { color: var(--text-muted); font-size: 15px; }

        @media (max-width: 992px) { 
            .dl-grid { grid-template-columns: 1fr; text-align: center; } 
            .dl-box { flex-direction: column; margin: 0 auto; }
            .dl-img-wrap { display: none; }
            .step-grid { grid-template-columns: 1fr; }
            .dl-hero { padding: 60px 0; }
        }

        
        .site-footer { background: #0f172a; color: #cbd5e1; padding: 80px 0 30px; }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 50px; margin-bottom: 60px; }
        .site-footer .logo span { color: #fff; }
        .footer-desc { margin-top: 24px; font-size: 14px; line-height: 1.8; color: #94a3b8; }
        .footer-title { font-size: 18px; color: #fff; margin-bottom: 25px; font-weight: 600; }
        .footer-links ul li { margin-bottom: 16px; }
        .footer-links ul li a { color: #94a3b8; transition: var(--transition); display: inline-block; }
        .footer-links ul li a:hover { color: #38bdf8; transform: translateX(5px); }
        .contact-item { margin-bottom: 16px; display: flex; gap: 12px; font-size: 14px; align-items: flex-start; }
        .contact-item span:first-child { color: #94a3b8; white-space: nowrap; font-weight: 500; }
        .footer-bottom { padding-top: 30px; border-top: 1px solid rgba(255,255,255,0.1); text-align: center; font-size: 14px; color: #64748b; display: flex; flex-direction: column; gap: 10px; align-items: center; }
        .footer-bottom a { color: #94a3b8; }
        .footer-bottom a:hover { color: #fff; }
        @media (max-width: 992px) { .footer-grid { grid-template-columns: 1fr 1fr; gap: 40px; } }
        @media (max-width: 576px) { .footer-grid { grid-template-columns: 1fr; } }