:root {
      --theme-color: rgb(99,102,241);
      --glacier-blue: #1D7BFF;
      --deep-sea-ink: #0B132B;
      --deep-sea-light: #1E293B;
      --silver-white: #F8FAFC;
      --text-dark: #0F172A;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --max-width: 1200px;
      --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
      --shadow-md: 0 10px 15px -3px rgba(0,0,0,0.1);
      --radius-lg: 16px;
      --radius-md: 12px;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; color: var(--text-dark); background-color: #F8FAFC; line-height: 1.6; }
    a { text-decoration: none; color: inherit; transition: all 0.3s ease; }
    img { max-width: 100%; height: auto; }
    
    
    .header { background: #FFFFFF; border-bottom: 1px solid var(--border-color); position: sticky; top: 0; z-index: 100; }
    .header-container { max-width: var(--max-width); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; padding: 16px 20px; }
    .logo { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; }
    .logo img { display: block; height: 40px; 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-dark); white-space: nowrap; }
    .nav-desktop { display: flex; align-items: center; gap: 24px; }
    .nav-desktop a { font-size: 15px; font-weight: 500; color: var(--text-dark); }
    .nav-desktop a:hover { color: var(--theme-color); }
    .header-action { display: flex; align-items: center; gap: 16px; }
    .btn-action { background: var(--theme-color); color: #FFF; padding: 10px 20px; border-radius: 8px; font-weight: 600; font-size: 14px; border: none; cursor: pointer; transition: background 0.3s; }
    .btn-action:hover { background: #4f46e5; }
    .menu-toggle { display: none; background: none; border: none; font-size: 24px; cursor: pointer; color: var(--text-dark); }

    
    .download-header { background: linear-gradient(135deg, var(--deep-sea-ink) 0%, #111827 100%); color: #FFF; padding: 80px 20px; text-align: center; }
    .download-header-content { max-width: 800px; margin: 0 auto; }
    .download-header h1 { font-size: 36px; font-weight: 800; margin-bottom: 20px; }
    .download-header p { font-size: 18px; color: #94A3B8; }

    .download-container { max-width: var(--max-width); margin: 60px auto; padding: 0 20px; }
    .platforms-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 30px; margin-bottom: 80px; }
    .platform-card { background: #FFFFFF; border: 1px solid var(--border-color); border-radius: var(--radius-lg); padding: 40px; text-align: center; transition: all 0.3s ease; box-shadow: var(--shadow-sm); }
    .platform-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: var(--theme-color); }
    .platform-icon { font-size: 48px; margin-bottom: 24px; color: var(--theme-color); }
    .platform-card h3 { font-size: 20px; font-weight: 700; color: var(--text-dark); margin-bottom: 12px; }
    .platform-card p { font-size: 14px; color: var(--text-muted); margin-bottom: 30px; line-height: 1.6; }
    .btn-dl { background: var(--theme-color); color: #FFF; display: block; width: 100%; padding: 12px; border-radius: 8px; font-weight: 600; font-size: 15px; }
    .btn-dl:hover { background: #4f46e5; }

    
    .steps-section { background: var(--silver-white); padding: 80px 20px; border-radius: var(--radius-lg); border: 1px solid var(--border-color); }
    .steps-section-title { text-align: center; font-size: 28px; font-weight: 800; color: var(--text-dark); margin-bottom: 50px; }
    .steps-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 30px; }
    .step-item { background: #FFFFFF; border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 30px; text-align: center; position: relative; }
    .step-badge { width: 36px; height: 36px; border-radius: 50%; background: var(--theme-color); color: #FFF; display: flex; align-items: center; justify-content: center; font-weight: 700; margin: 0 auto 20px auto; }
    .step-item h4 { font-size: 18px; font-weight: 700; color: var(--text-dark); margin-bottom: 12px; }
    .step-item p { font-size: 14px; color: var(--text-muted); line-height: 1.6; }

    
    .footer { background: #0F172A; color: #94A3B8; border-top: 1px solid #1E293B; }
    .footer-top { max-width: var(--max-width); margin: 0 auto; padding: 80px 20px 40px 20px; display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 40px; }
    .footer-brand { grid-column: span 2; }
    .footer-brand .logo span { color: #FFFFFF; }
    .footer-brand p { margin-top: 16px; font-size: 14px; line-height: 1.6; max-width: 320px; }
    .footer-col h4 { font-size: 16px; font-weight: 700; color: #FFFFFF; margin-bottom: 24px; }
    .footer-col ul { list-style: none; }
    .footer-col ul li { margin-bottom: 12px; }
    .footer-col ul li a { font-size: 14px; transition: color 0.3s; }
    .footer-col ul li a:hover { color: #FFFFFF; }
    .footer-bottom { border-top: 1px solid #1E293B; max-width: var(--max-width); margin: 0 auto; padding: 30px 20px; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 20px; font-size: 13px; }
    .footer-copyright { font-size: 13px; }
    .footer-links { display: flex; gap: 20px; }
    .footer-links a:hover { color: #FFFFFF; }

    
    .mobile-drawer-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); z-index: 998; opacity: 0; pointer-events: none; transition: opacity 0.3s; }
    .mobile-drawer-overlay.active { opacity: 1; pointer-events: auto; }
    .mobile-drawer { position: fixed; top: 0; left: -280px; width: 280px; height: 100%; background: #FFF; z-index: 999; box-shadow: 2px 0 10px rgba(0,0,0,0.1); transition: left 0.3s ease; display: flex; flex-direction: column; }
    .mobile-drawer.active { left: 0; }
    .drawer-header { padding: 20px; border-bottom: 1px solid var(--border-color); display: flex; align-items: center; justify-content: space-between; }
    .drawer-close { background: none; border: none; font-size: 24px; cursor: pointer; color: var(--text-dark); }
    .drawer-nav { padding: 20px; display: flex; flex-direction: column; gap: 16px; }
    .drawer-nav a { font-size: 16px; font-weight: 600; color: var(--text-dark); display: block; padding: 10px 0; border-bottom: 1px solid #F1F5F9; }
    .drawer-nav a:hover { color: var(--theme-color); }

    @media (max-width: 768px) {
      .nav-desktop, .header-action { display: none; }
      .menu-toggle { display: block; }
      .footer-brand { grid-column: span 1; }
    }