:root {
      --primary: #1D7BFF;
      --primary-hover: #0056b3;
      --bg-deep: #060a13;
      --bg-dark: #0a0f1d;
      --bg-card: #111827;
      --bg-light: #f8fafc;
      --text-dark: #0f172a;
      --text-muted: #64748b;
      --text-light: #f8fafc;
      --silver-white: #e2e8f0;
      --card-border: rgba(255, 255, 255, 0.08);
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    * { margin: 0; padding: 0; box-sizing: border-box; }
    body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; background-color: var(--bg-light); color: var(--text-dark); line-height: 1.7; }
    .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
    
    
    .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: 18px; font-weight: 800; line-height: 1; color: var(--text-light); white-space: nowrap; }
    .header-light .logo span { color: var(--text-dark); }

    
    header { background: var(--bg-deep); border-bottom: 1px solid rgba(255,255,255,0.05); position: sticky; top: 0; z-index: 100; transition: var(--transition); }
    header.header-light { background: rgba(255, 255, 255, 0.95); border-bottom: 1px solid #e2e8f0; backdrop-filter: blur(10px); }
    header .container { display: flex; align-items: center; justify-content: space-between; height: 72px; }
    .nav-list { display: flex; align-items: center; gap: 32px; list-style: none; }
    .nav-list a { color: var(--silver-white); text-decoration: none; font-size: 15px; font-weight: 500; transition: var(--transition); }
    .nav-list a:hover { color: var(--primary); }
    .header-light .nav-list a { color: var(--text-dark); }
    .header-light .nav-list a:hover { color: var(--primary); }
    
    
    .menu-toggle { display: none; background: none; border: none; cursor: pointer; flex-direction: column; gap: 6px; }
    .menu-toggle span { display: block; width: 24px; height: 2px; background: var(--text-light); transition: var(--transition); }
    .header-light .menu-toggle span { background: var(--text-dark); }
    .drawer-overlay { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.6); z-index: 1000; opacity: 0; transition: var(--transition); }
    .drawer-overlay.active { display: block; opacity: 1; }
    .mobile-drawer { position: fixed; top: 0; left: -280px; width: 280px; height: 100%; background: var(--bg-dark); border-right: 1px solid var(--card-border); z-index: 1001; transition: var(--transition); padding: 30px 24px; display: flex; flex-direction: column; gap: 40px; }
    .mobile-drawer.active { left: 0; }
    .drawer-header { display: flex; align-items: center; justify-content: space-between; }
    .drawer-close { background: none; border: none; font-size: 28px; color: var(--text-light); cursor: pointer; }
    .drawer-nav { display: flex; flex-direction: column; gap: 20px; }
    .drawer-nav a { color: var(--silver-white); text-decoration: none; font-size: 16px; font-weight: 500; padding: 10px 0; border-bottom: 1px solid rgba(255,255,255,0.05); }
    .drawer-nav a:hover { color: var(--primary); }

    
    .download-hero { background: radial-gradient(circle at top, #1e293b, var(--bg-deep)); color: var(--text-light); padding: 80px 0; text-align: center; }
    .download-hero h1 { font-size: 38px; font-weight: 800; margin-bottom: 16px; }
    .download-hero p { color: var(--silver-white); font-size: 16px; max-width: 680px; margin: 0 auto; opacity: 0.9; }

    
    .download-section { padding: 80px 0; }
    .download-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; margin-bottom: 60px; }
    .download-card { background: #fff; border: 1px solid #e2e8f0; border-radius: 16px; padding: 40px 30px; text-align: center; transition: var(--transition); display: flex; flex-direction: column; justify-content: space-between; }
    .download-card:hover { transform: translateY(-5px); box-shadow: 0 15px 30px rgba(0,0,0,0.05); }
    .platform-icon { font-size: 48px; margin-bottom: 24px; color: var(--primary); }
    .platform-name { font-size: 22px; font-weight: 700; margin-bottom: 12px; color: var(--text-dark); }
    .platform-desc { color: var(--text-muted); font-size: 14px; margin-bottom: 24px; line-height: 1.6; }
    
    
    .btn { display: inline-flex; align-items: center; justify-content: center; padding: 12px 28px; font-size: 15px; font-weight: 600; border-radius: 8px; text-decoration: none; cursor: pointer; transition: var(--transition); gap: 8px; }
    .btn-primary { background: var(--primary); color: var(--text-light); border: none; box-shadow: 0 4px 14px var(--primary-glow); }
    .btn-primary:hover { background: var(--primary-hover); transform: translateY(-2px); }

    
    .steps-section { background-color: var(--bg-deep); color: var(--text-light); padding: 80px 0; }
    .steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; }
    .step-card { background: var(--bg-card); border: 1px solid var(--card-border); border-radius: 16px; padding: 30px; position: relative; }
    .step-num { position: absolute; top: -20px; left: 30px; width: 40px; height: 40px; background: var(--primary); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: var(--text-light); font-weight: 800; font-size: 16px; box-shadow: 0 4px 10px rgba(29, 123, 255, 0.3); }
    .step-title { font-size: 18px; font-weight: 700; margin-top: 15px; margin-bottom: 12px; color: var(--text-light); }
    .step-desc { color: var(--silver-white); font-size: 13px; opacity: 0.8; line-height: 1.6; }

    
    footer { background: var(--bg-deep); border-top: 1px solid rgba(255,255,255,0.05); padding: 80px 0 30px; color: var(--silver-white); }
    .footer-grid { display: grid; grid-template-columns: 2fr repeat(3, 1fr); gap: 40px; margin-bottom: 50px; }
    .footer-brand { display: flex; flex-direction: column; gap: 20px; }
    .footer-brand p { color: var(--text-muted); font-size: 14px; line-height: 1.6; }
    .footer-title { font-size: 16px; font-weight: 700; color: var(--text-light); margin-bottom: 24px; position: relative; }
    .footer-title::after { content: ''; position: absolute; bottom: -8px; left: 0; width: 30px; height: 2px; background: var(--primary); }
    .footer-links { list-style: none; display: flex; flex-direction: column; gap: 14px; }
    .footer-links a { color: var(--text-muted); text-decoration: none; font-size: 14px; transition: var(--transition); }
    .footer-links a:hover { color: var(--primary); padding-left: 4px; }
    .footer-contact { display: flex; flex-direction: column; gap: 14px; font-size: 14px; color: var(--text-muted); }
    .footer-contact span { display: inline-flex; align-items: center; gap: 8px; }
    .footer-bottom { border-top: 1px solid rgba(255,255,255,0.05); padding-top: 30px; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 20px; font-size: 13px; color: var(--text-muted); }

    
    @media (max-width: 992px) {
      .download-grid { grid-template-columns: 1fr; }
      .steps-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-list { display: none; }
      .menu-toggle { display: flex; }
      .steps-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }