:root {
      --primary-color: rgb(79,70,229);
      --primary-hover: rgb(67,56,202);
      --accent-blue: #1D7BFF;
      --glacier-blue: #E0F2FE;
      --deep-sea: #0B0F19;
      --silver-white: #F8FAFC;
      --text-primary: #0F172A;
      --text-secondary: #475569;
      --border-color: #E2E8F0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08);
      --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
      --radius: 12px;
    }

    * { box-sizing: border-box; margin: 0; padding: 0; }
    body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; color: var(--text-primary); background-color: var(--silver-white); line-height: 1.6; }
    a { color: inherit; text-decoration: none; transition: 0.3s; }
    .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }

    
    header { background: rgba(255, 255, 255, 0.95); backdrop-filter: blur(8px); border-bottom: 1px solid var(--border-color); position: sticky; top: 0; z-index: 100; height: 70px; }
    .header-container { display: flex; justify-content: space-between; align-items: center; height: 100%; }
    .logo { display: inline-flex; align-items: center; gap: 12px; }
    .logo img { height: 40px; max-width: 160px; object-fit: contain; }
    .logo span { font-size: 18px; font-weight: 800; }
    .nav-desktop { display: flex; align-items: center; gap: 24px; }
    .nav-desktop a { font-weight: 500; color: var(--text-secondary); }
    .nav-desktop a:hover { color: var(--primary-color); }
    .menu-toggle { display: none; background: none; border: none; font-size: 24px; cursor: pointer; }

    
    .drawer-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); z-index: 998; opacity: 0; visibility: hidden; transition: 0.3s; }
    .drawer { position: fixed; top: 0; left: -280px; width: 280px; height: 100%; background: #fff; z-index: 999; box-shadow: var(--shadow-lg); transition: 0.3s; display: flex; flex-direction: column; padding: 20px; }
    .drawer.active { left: 0; }
    .drawer-overlay.active { opacity: 1; visibility: visible; }
    .drawer-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 30px; border-bottom: 1px solid var(--border-color); padding-bottom: 15px; }
    .drawer-close { background: none; border: none; font-size: 24px; cursor: pointer; }
    .drawer-menu { display: flex; flex-direction: column; gap: 16px; }

    
    .download-hero { background: var(--deep-sea); color: #fff; padding: 80px 0; text-align: center; }
    .download-hero h1 { font-size: 40px; font-weight: 800; margin-bottom: 12px; }
    .download-hero p { color: rgba(255,255,255,0.7); max-width: 600px; margin: 0 auto 40px; }

    .download-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; max-width: 1000px; margin: 0 auto; }
    .download-card { background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1); border-radius: var(--radius); padding: 40px 30px; backdrop-filter: blur(8px); display: flex; flex-direction: column; align-items: center; transition: 0.3s; }
    .download-card:hover { border-color: var(--accent-blue); background: rgba(255,255,255,0.08); transform: translateY(-5px); }
    .download-icon { font-size: 48px; margin-bottom: 20px; }
    .download-card h3 { font-size: 22px; font-weight: 700; margin-bottom: 8px; }
    .download-card p { font-size: 13px; color: rgba(255,255,255,0.6); margin-bottom: 30px; text-align: center; }
    .download-btn { background: #fff; color: var(--deep-sea); padding: 12px 30px; border-radius: 8px; font-weight: 600; font-size: 14px; width: 100%; text-align: center; }
    .download-btn:hover { background: var(--accent-blue); color: #fff; }

    
    .guide-section { padding: 80px 0; background: #fff; }
    .section-title { text-align: center; font-size: 32px; font-weight: 800; margin-bottom: 50px; }
    .guide-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; }
    .step-card { text-align: center; }
    .step-num { width: 50px; height: 50px; background: var(--glacier-blue); color: var(--accent-blue); font-size: 24px; font-weight: 800; border-radius: 50%; display: flex; align-items: center; justify-content: center; margin: 0 auto 20px; }
    .step-card h4 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
    .step-card p { font-size: 14px; color: var(--text-secondary); }

    
    footer { background: #0f172a; color: #94a3b8; padding: 60px 0 30px; font-size: 14px; }
    .footer-grid { display: grid; grid-template-columns: 2fr repeat(3, 1fr); gap: 40px; margin-bottom: 40px; }
    .footer-logo-desc { display: flex; flex-direction: column; gap: 20px; }
    .footer-logo-desc .logo span { color: #fff; }
    .footer-col h4 { color: #fff; font-size: 16px; font-weight: 700; margin-bottom: 20px; }
    .footer-links { list-style: none; display: flex; flex-direction: column; gap: 12px; }
    .footer-links a:hover { color: #fff; }
    .footer-bottom { border-top: 1px solid #1e293b; padding-top: 30px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 20px; }

    @media (max-width: 900px) {
      .download-cards { grid-template-columns: 1fr; }
      .guide-steps { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-desktop { display: none; }
      .menu-toggle { display: block; }
      .footer-grid { grid-template-columns: 1fr; }
    }