:root { --primary: rgb(0, 122, 255); --primary-hover: #0062cc; --primary-light: rgba(0, 122, 255, 0.1); --bg-body: #f4f7fb; --bg-white: #ffffff; --text-main: #1e293b; --text-muted: #64748b; --border-color: #e2e8f0; --header-bg: #0b1120; --footer-bg: #040814; }
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif; background: var(--bg-body); color: var(--text-main); line-height: 1.6; }
        a { text-decoration: none; color: inherit; transition: 0.3s; }
        ul, li { list-style: none; }
        img { max-width: 100%; height: auto; display: block; }
        .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        
        
        .site-header { background: var(--header-bg); position: sticky; top: 0; z-index: 100; box-shadow: 0 4px 20px rgba(0,0,0,0.2); }
        .header-inner { height: 70px; display: flex; align-items: center; justify-content: space-between; }
        .logo { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; }
        .logo img { display: block; height: 36px; width: auto; max-width: 160px; object-fit: contain; flex-shrink: 0; }
        .logo span { display: inline-block; font-size: 20px; font-weight: 800; line-height: 1; color: #fff; white-space: nowrap; }
        .desktop-nav { display: none; } .desktop-nav ul { display: flex; gap: 30px; } .desktop-nav a { color: #cbd5e1; font-size: 15px; font-weight: 500; 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: 0.3s; } .desktop-nav a:hover::after { width: 100%; }
        .header-right { display: flex; align-items: center; gap: 20px; } .btn-download-sm { display: none; background: var(--primary); color: #fff; padding: 8px 20px; border-radius: 20px; font-weight: 600; font-size: 14px; } .btn-download-sm:hover { background: var(--primary-hover); transform: translateY(-1px); } .menu-toggle { display: block; background: none; border: none; cursor: pointer; padding: 5px; } .menu-toggle span { display: block; width: 24px; height: 2px; background: #fff; margin: 5px 0; transition: 0.3s; }
        @media (min-width: 992px) { .desktop-nav, .btn-download-sm { display: block; } .menu-toggle { display: none; } }
        .drawer-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.6); z-index: 998; opacity: 0; visibility: hidden; transition: 0.3s; backdrop-filter: blur(4px); } .mobile-drawer { position: fixed; top: 0; left: -300px; width: 280px; height: 100%; background: var(--header-bg); z-index: 999; transition: 0.4s; display: flex; flex-direction: column; } .drawer-active .drawer-overlay { opacity: 1; visibility: visible; } .drawer-active .mobile-drawer { left: 0; } .drawer-header { padding: 20px; border-bottom: 1px solid rgba(255,255,255,0.05); display: flex; justify-content: space-between; align-items: center; } .btn-close { background: none; border: none; color: #fff; font-size: 28px; cursor: pointer; } .drawer-body { padding: 20px; overflow-y: auto; flex: 1; } .drawer-nav a { display: block; padding: 15px 0; color: #cbd5e1; border-bottom: 1px solid rgba(255,255,255,0.05); font-weight: 500; } .drawer-nav a:hover { color: var(--primary); padding-left: 10px; } .drawer-footer { padding: 20px; border-top: 1px solid rgba(255,255,255,0.05); } .btn-primary { background: var(--primary); color: #fff; padding: 14px 32px; border-radius: 8px; font-weight: 600; font-size: 16px; display: inline-flex; justify-content: center; }
        .site-footer { background: var(--footer-bg); color: #94a3b8; padding: 60px 0 30px; border-top: 1px solid #1e293b; } .footer-grid { display: grid; grid-template-columns: 1fr; gap: 40px; margin-bottom: 40px; } .footer-brand p { margin-top: 20px; font-size: 14px; line-height: 1.8; } .footer-title { color: #fff; font-size: 18px; font-weight: 700; margin-bottom: 20px; position: relative; padding-bottom: 10px; } .footer-title::after { content: ''; position: absolute; left: 0; bottom: 0; width: 30px; height: 2px; background: var(--primary); } .footer-links li { margin-bottom: 12px; } .footer-links a { font-size: 14px; } .footer-links a:hover { color: var(--primary); padding-left: 5px; } .footer-bottom { text-align: center; padding-top: 30px; border-top: 1px solid rgba(255,255,255,0.05); font-size: 14px; } @media (min-width: 768px) { .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; } }

        
        .dl-hero { background: #fff; padding: 80px 0 0 0; overflow: hidden; }
        .dl-grid { display: grid; grid-template-columns: 1fr; gap: 50px; align-items: center; }
        @media (min-width: 992px) { .dl-grid { grid-template-columns: 1fr 1fr; } }
        
        .dl-content { padding-bottom: 80px; text-align: center; }
        @media (min-width: 992px) { .dl-content { text-align: left; } }
        
        .dl-title { font-size: 38px; font-weight: 900; margin-bottom: 20px; color: var(--text-main); line-height: 1.2; }
        .dl-title span { color: var(--primary); }
        .dl-desc { font-size: 18px; color: var(--text-muted); margin-bottom: 40px; }
        
        .dl-actions { display: flex; flex-wrap: wrap; gap: 20px; justify-content: center; align-items: center; }
        @media (min-width: 992px) { .dl-actions { justify-content: flex-start; } }
        
        .dl-btn { display: flex; align-items: center; gap: 15px; padding: 15px 30px; border-radius: 12px; font-weight: bold; font-size: 16px; color: #fff; background: var(--text-main); transition: 0.3s; box-shadow: 0 10px 20px rgba(0,0,0,0.1); width: 220px; justify-content: center;}
        .dl-btn.ios { background: #000; }
        .dl-btn.android { background: #3ddc84; color: #000;}
        .dl-btn:hover { transform: translateY(-3px); box-shadow: 0 15px 30px rgba(0,0,0,0.15); }
        .dl-btn i { font-size: 24px; font-style: normal; }
        
        .qr-code-box { background: #fff; padding: 10px; border-radius: 12px; border: 1px solid var(--border-color); box-shadow: 0 4px 10px rgba(0,0,0,0.05); text-align: center; }
        .qr-code-box div { width: 120px; height: 120px; background: #e2e8f0; margin: 0 auto 10px; display: flex; align-items: center; justify-content: center; font-size: 12px; color: var(--text-muted); }
        
        .dl-mockup { position: relative; height: 500px; }
        .dl-phone { width: 260px; height: 520px; background: #111; border-radius: 36px; border: 8px solid #333; position: absolute; bottom: -50px; left: 50%; transform: translateX(-50%); box-shadow: 0 20px 50px rgba(0,0,0,0.3); overflow: hidden; display: flex; flex-direction: column; }
        .dl-phone-screen { flex: 1; background: var(--header-bg); padding: 20px; color: #fff; }
        
        .dl-features { padding: 80px 0; background: var(--bg-body); }
        .step-grid { display: grid; grid-template-columns: 1fr; gap: 30px; margin-top: 50px; }
        @media (min-width: 768px) { .step-grid { grid-template-columns: repeat(3, 1fr); } }
        .step-card { background: #fff; padding: 40px 30px; border-radius: 16px; text-align: center; position: relative; box-shadow: 0 4px 6px rgba(0,0,0,0.02); }
        .step-num { width: 40px; height: 40px; background: var(--primary); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 20px; font-weight: bold; position: absolute; top: -20px; left: 50%; transform: translateX(-50%); box-shadow: 0 4px 10px rgba(0,122,255,0.3); }
        .step-card h3 { margin-top: 10px; margin-bottom: 15px; font-size: 20px; }
        .step-card p { color: var(--text-muted); font-size: 14px; }

        .app-adv { padding: 80px 0; background: #fff; }
        .adv-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 20px; }
        .adv-item { display: flex; gap: 20px; align-items: flex-start; padding: 20px; background: var(--bg-body); border-radius: 12px; }
        .adv-icon { width: 50px; height: 50px; background: var(--primary-light); color: var(--primary); border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 24px; flex-shrink: 0; }
        .adv-text h4 { font-size: 18px; margin-bottom: 5px; }
        .adv-text p { color: var(--text-muted); font-size: 14px; }