:root {
      --primary: rgb(52,168,83);
      --primary-hover: rgb(40,140,70);
      --glacier-blue: #1D7BFF;
      --glacier-deep: #0A2540;
      --silver-white: #F8FAFC;
      --dark-navy: #0d131a;
      --text-main: #333333;
      --text-muted: #666666;
      --border-color: #E2E8F0;
      --container-width: 1200px;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; color: var(--text-main); background-color: var(--silver-white); line-height: 1.6; }
    a { color: inherit; text-decoration: none; transition: all 0.3s; }
    .container { max-width: var(--container-width); margin: 0 auto; padding: 0 20px; }
    
    
    .site-header { background: rgba(13, 25, 41, 0.95); backdrop-filter: blur(10px); position: sticky; top: 0; z-index: 1000; border-bottom: 1px solid rgba(255,255,255,0.1); }
    .header-container { display: flex; align-items: center; justify-content: space-between; height: 70px; }
    .logo { display: inline-flex; align-items: center; gap: 12px; }
    .logo img { display: block; height: 40px; 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: flex; gap: 24px; }
    .desktop-nav a { color: rgba(255,255,255,0.8); font-size: 15px; font-weight: 500; padding: 6px 12px; border-radius: 4px; }
    .desktop-nav a:hover { color: #FFF; background: rgba(255,255,255,0.1); }
    .nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 4px; }
    .nav-toggle span { display: block; width: 24px; height: 2px; background: #FFF; margin: 5px 0; transition: 0.3s; }
    
    
    .drawer-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); z-index: 1001; opacity: 0; pointer-events: none; transition: 0.3s; }
    .drawer-overlay.active { opacity: 1; pointer-events: auto; }
    .mobile-drawer { position: fixed; top: 0; left: -280px; width: 280px; height: 100%; background: #0A2540; z-index: 1002; transition: 0.3s; display: flex; flex-direction: column; padding: 20px; }
    .mobile-drawer.active { left: 0; }
    .drawer-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 30px; }
    .drawer-close { font-size: 28px; color: #FFF; background: none; border: none; cursor: pointer; }
    .drawer-nav { display: flex; flex-direction: column; gap: 15px; }
    .drawer-nav a { color: #FFF; font-size: 16px; padding: 10px; border-bottom: 1px solid rgba(255,255,255,0.1); }

    
    .download-hero { background: linear-gradient(135deg, var(--glacier-deep) 0%, #112240 100%); color: #FFF; padding: 80px 0; text-align: center; }
    .download-hero h1 { font-size: 38px; font-weight: 800; margin-bottom: 15px; }
    .download-hero p { font-size: 18px; color: rgba(255,255,255,0.8); max-width: 600px; margin: 0 auto; }

    .download-container { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; margin: 60px auto; max-width: 1000px; align-items: center; }
    .download-visual { background: #FFF; border: 1px solid var(--border-color); border-radius: 16px; padding: 40px; text-align: center; box-shadow: 0 15px 40px rgba(0,0,0,0.05); }
    .qr-mock { width: 180px; height: 180px; background: #FFF; border: 1px solid var(--border-color); margin: 0 auto 20px; padding: 10px; border-radius: 8px; position: relative; }
    .qr-mock::after { content: '扫描二维码下载'; display: block; position: absolute; bottom: -30px; left: 0; right: 0; text-align: center; font-size: 13px; color: var(--text-muted); }
    .app-meta-box { margin-top: 50px; display: flex; justify-content: space-around; font-size: 13px; color: var(--text-muted); border-top: 1px solid var(--border-color); padding-top: 20px; }
    
    .download-actions { display: flex; flex-direction: column; gap: 20px; }
    .download-btn { display: flex; align-items: center; justify-content: center; gap: 15px; padding: 18px; border-radius: 10px; font-weight: 700; font-size: 18px; transition: 0.3s; cursor: pointer; }
    .download-btn.android { background: var(--primary); color: #FFF; }
    .download-btn.android:hover { background: var(--primary-hover); transform: translateY(-2px); }
    .download-btn.ios { background: #1A1A1A; color: #FFF; }
    .download-btn.ios:hover { background: #333; transform: translateY(-2px); }
    
    
    .section-padding { padding: 60px 0; }
    .guide-title { text-align: center; margin-bottom: 40px; font-size: 26px; font-weight: 800; color: var(--dark-navy); }
    .steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
    .step-card { background: #FFF; border: 1px solid var(--border-color); border-radius: 12px; padding: 30px; position: relative; }
    .step-num { position: absolute; top: 20px; right: 20px; font-size: 36px; font-weight: 800; color: rgba(52,168,83,0.15); }
    .step-card h3 { font-size: 18px; font-weight: 700; color: var(--dark-navy); margin-bottom: 12px; }
    .step-card p { font-size: 14px; color: var(--text-muted); line-height: 1.6; }

    
    .site-footer { background: #0A192F; color: #A0AEC0; padding: 80px 0 30px; font-size: 14px; border-top: 1px solid rgba(255,255,255,0.1); }
    .footer-grid { display: grid; grid-template-columns: 1.5fr repeat(3, 1fr); gap: 40px; margin-bottom: 50px; }
    .footer-brand .logo { margin-bottom: 20px; }
    .footer-brand p { line-height: 1.6; margin-bottom: 20px; }
    .footer-col h5 { font-size: 16px; font-weight: 700; color: #FFF; margin-bottom: 20px; position: relative; }
    .footer-col h5::after { content: ''; display: block; width: 30px; height: 2px; background: var(--primary); margin-top: 8px; }
    .footer-col ul { list-style: none; }
    .footer-col ul li { margin-bottom: 12px; }
    .footer-col ul li a:hover { color: #FFF; }
    .footer-bottom { border-top: 1px solid rgba(255,255,255,0.05); padding-top: 30px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 15px; }
    .footer-bottom p { font-size: 13px; }
    .footer-meta-links { display: flex; gap: 20px; }

    @media (max-width: 768px) {
      .desktop-nav { display: none; }
      .nav-toggle { display: block; }
      .download-container { grid-template-columns: 1fr; margin: 30px auto; }
      .steps-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }