:root {
      --primary: rgb(3,105,161);
      --glacier: #1D7BFF;
      --deep-sea: #0A1128;
      --sea-medium: #101F42;
      --silver-white: #F4F7FC;
      --text-dark: #1E293B;
      --text-muted: #64748B;
      --text-light: #F8FAFC;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body { font-family: sans-serif; color: var(--text-dark); background-color: var(--silver-white); line-height: 1.6; }
    a { text-decoration: none; color: inherit; transition: all 0.3s ease; }

    
    .header { background: var(--deep-sea); border-bottom: 1px solid rgba(255, 255, 255, 0.08); position: sticky; top: 0; z-index: 1000; }
    .header-container { max-width: 1200px; margin: 0 auto; padding: 16px 20px; display: flex; align-items: center; justify-content: space-between; }
    .logo { display: inline-flex; align-items: center; gap: 12px; }
    .logo img { display: block; height: 40px; width: auto; max-width: 160px; object-fit: contain; }
    .logo span { display: inline-block; font-size: 20px; font-weight: 800; color: var(--text-light); }
    .nav-desktop { display: flex; gap: 28px; }
    .nav-desktop a { color: #94A3B8; font-size: 15px; }
    .nav-desktop a:hover { color: var(--glacier); }
    .btn-primary-sm { background: linear-gradient(135deg, var(--glacier), var(--primary)); color: var(--text-light); padding: 10px 20px; border-radius: 6px; font-weight: 600; font-size: 14px; }
    .mobile-menu-btn { display: none; background: none; border: none; cursor: pointer; flex-direction: column; gap: 6px; }
    .mobile-menu-btn span { display: block; width: 24px; height: 2px; background: var(--text-light); }

    .drawer-overlay { position: fixed; top: 0; left: 0; width: 100vw; height: 100vh; background: rgba(10, 17, 40, 0.8); z-index: 1999; display: none; }
    .drawer { position: fixed; top: 0; left: -300px; width: 300px; height: 100vh; background: var(--deep-sea); z-index: 2000; transition: left 0.3s ease; display: flex; flex-direction: column; }
    .drawer.active { left: 0; }
    .drawer-header { padding: 24px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid rgba(255, 255, 255, 0.08); }
    .drawer-close { background: none; border: none; color: var(--text-light); font-size: 28px; }
    .drawer-content { flex: 1; padding: 24px; }
    .drawer-nav { display: flex; flex-direction: column; gap: 20px; }

    
    .download-hero { background: radial-gradient(circle at center, var(--sea-medium), var(--deep-sea)); color: var(--text-light); padding: 80px 20px; text-align: center; }
    .download-hero h1 { font-size: 38px; font-weight: 800; margin-bottom: 16px; }
    .download-hero p { font-size: 18px; color: #94A3B8; max-width: 600px; margin: 0 auto; }

    .download-grid { max-width: 1100px; margin: -50px auto 60px; padding: 0 20px; display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; position: relative; z-index: 10; }
    .download-card { background: #FFF; border-radius: 16px; padding: 40px; box-shadow: 0 10px 30px rgba(0,0,0,0.1); border-top: 5px solid var(--primary); text-align: center; }
    .download-card.ios-android { border-top-color: var(--glacier); }
    .download-card h2 { font-size: 24px; font-weight: 700; color: var(--deep-sea); margin-bottom: 12px; }
    .download-card p { font-size: 14px; color: var(--text-muted); margin-bottom: 30px; }
    
    .btn-download { display: inline-flex; align-items: center; justify-content: center; gap: 10px; width: 100%; max-width: 280px; padding: 14px 24px; border-radius: 8px; font-weight: 700; font-size: 16px; margin-bottom: 16px; transition: all 0.3s ease; }
    .btn-download.pc { background: var(--deep-sea); color: var(--text-light); }
    .btn-download.wap { background: var(--glacier); color: var(--text-light); }
    .btn-download:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,0,0,0.15); }

    .step-section { max-width: 800px; margin: 60px auto; padding: 0 20px; text-align: center; }
    .step-section h2 { font-size: 28px; font-weight: 800; color: var(--deep-sea); margin-bottom: 30px; }
    .steps-wrapper { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .step-item { background: #FFF; padding: 24px; border-radius: 12px; box-shadow: 0 4px 6px rgba(0,0,0,0.02); }
    .step-num { width: 36px; height: 36px; border-radius: 50%; background: var(--glacier); color: #FFF; display: flex; align-items: center; justify-content: center; font-weight: 700; margin: 0 auto 16px; }

    
    .footer { background: var(--deep-sea); color: #94A3B8; border-top: 1px solid rgba(255, 255, 255, 0.08); padding: 60px 20px 20px; margin-top: 80px; }
    .footer-container { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 1.5fr repeat(3, 1fr); gap: 40px; margin-bottom: 40px; }
    .footer-brand .logo { margin-bottom: 16px; }
    .footer-col h4 { color: var(--text-light); font-size: 16px; font-weight: 700; margin-bottom: 20px; }
    .footer-col ul { list-style: none; }
    .footer-col ul li { margin-bottom: 12px; }
    .footer-bottom { border-top: 1px solid rgba(255, 255, 255, 0.05); padding-top: 20px; font-size: 12px; text-align: center; }

    @media (max-width: 991px) {
      .nav-desktop { display: none; }
      .mobile-menu-btn { display: flex; }
      .download-grid { grid-template-columns: 1fr; margin-top: 20px; }
      .steps-wrapper { grid-template-columns: 1fr; }
      .footer-container { grid-template-columns: 1fr; }
    }