:root {
      --primary-color: rgb(14, 116, 144);
      --primary-hover: rgb(15, 118, 110);
      --text-main: #1F2937;
      --text-muted: #6B7280;
      --bg-light: #F9FAFB;
      --border-color: #E5E7EB;
      --card-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; color: var(--text-main); line-height: 1.6; background: #fff; }
    a { text-decoration: none; color: inherit; transition: all 0.3s ease; }
    
    
    header { background: #fff; border-bottom: 1px solid var(--border-color); position: sticky; top: 0; z-index: 100; }
    .header-container { max-width: 1200px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; padding: 15px 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: 20px; font-weight: 800; line-height: 1; color: var(--text-main); white-space: nowrap; }
    .logo .fallback-txt { display: none; font-size: 18px; font-weight: 800; color: var(--primary-color); }
    
    nav.nav-desktop { display: flex; align-items: center; gap: 24px; }
    nav.nav-desktop a { font-size: 15px; font-weight: 500; color: var(--text-main); }
    nav.nav-desktop a:hover { color: var(--primary-color); }
    
    .nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 5px; }
    .nav-toggle span { display: block; width: 24px; height: 2px; background: var(--text-main); 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: 199; opacity: 0; visibility: hidden; transition: 0.3s; }
    .drawer-overlay.active { opacity: 1; visibility: visible; }
    .drawer { position: fixed; top: 0; left: -280px; width: 280px; height: 100%; background: #fff; z-index: 200; box-shadow: 2px 0 10px rgba(0,0,0,0.1); transition: 0.3s ease-in-out; display: flex; flex-direction: column; padding: 20px; }
    .drawer.active { left: 0; }
    .drawer-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 30px; border-bottom: 1px solid var(--border-color); padding-bottom: 15px; }
    .drawer-close { background: none; border: none; font-size: 24px; cursor: pointer; color: var(--text-muted); }
    .drawer-nav { display: flex; flex-direction: column; gap: 18px; overflow-y: auto; flex-grow: 1; }
    .drawer-nav a { font-size: 16px; font-weight: 500; color: var(--text-main); padding: 8px 0; border-bottom: 1px dashed var(--bg-light); }
    .drawer-nav a:hover { color: var(--primary-color); }

    
    .dl-hero { background: linear-gradient(135deg, var(--primary-color) 0%, #155e75 100%); color: #fff; padding: 80px 20px; text-align: center; }
    .dl-hero h1 { font-size: 36px; font-weight: 800; margin-bottom: 15px; }
    .dl-hero p { font-size: 16px; opacity: 0.9; max-width: 600px; margin: 0 auto; }

    .dl-main { padding: 60px 20px; }
    .dl-container { max-width: 1000px; margin: 0 auto; }
    
    
    .device-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; margin-bottom: 60px; }
    .device-card { background: #fff; border: 1px solid var(--border-color); border-radius: 16px; padding: 40px 30px; text-align: center; box-shadow: var(--card-shadow); transition: 0.3s; }
    .device-card:hover { transform: translateY(-5px); border-color: var(--primary-color); }
    .dev-icon { font-size: 48px; color: var(--primary-color); margin-bottom: 20px; }
    .device-card h3 { font-size: 22px; margin-bottom: 10px; font-weight: 700; }
    .device-card p { font-size: 14px; color: var(--text-muted); margin-bottom: 25px; }
    .btn-dl { background: var(--primary-color); color: #fff; display: block; padding: 12px 20px; border-radius: 8px; font-weight: 600; font-size: 15px; }
    .btn-dl:hover { background: var(--primary-hover); }

    
    .step-section { background: var(--bg-light); border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); padding: 80px 20px; }
    .steps-container { max-width: 1000px; margin: 0 auto; }
    .steps-title { text-align: center; margin-bottom: 50px; }
    .steps-title h2 { font-size: 28px; font-weight: 700; }
    .step-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
    .step-item { background: #fff; padding: 30px; border-radius: 12px; border: 1px solid var(--border-color); position: relative; }
    .step-num { width: 36px; height: 36px; border-radius: 50%; background: var(--primary-color); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; margin-bottom: 20px; }
    .step-item h4 { font-size: 18px; margin-bottom: 10px; }
    .step-item p { font-size: 14px; color: var(--text-muted); }

    
    footer { background: #111827; color: #9CA3AF; padding: 60px 20px 30px; font-size: 14px; }
    .footer-grid { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 2fr repeat(3, 1fr); gap: 40px; margin-bottom: 50px; }
    .footer-brand .logo span { color: #fff; }
    .footer-brand p { margin-top: 15px; line-height: 1.6; }
    .footer-column h4 { color: #fff; font-size: 16px; font-weight: 600; margin-bottom: 20px; }
    .footer-column ul { list-style: none; }
    .footer-column ul li { margin-bottom: 10px; }
    .footer-column ul li a:hover { color: #fff; }
    .footer-bottom { max-width: 1200px; margin: 0 auto; border-top: 1px solid #1F2937; padding-top: 30px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 15px; }
    .footer-links { display: flex; gap: 20px; }
    .footer-links a:hover { color: #fff; }

    
    @media (max-width: 768px) {
      .nav-desktop { display: none; }
      .nav-toggle { display: block; }
      .device-grid, .step-list { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .footer-bottom { flex-direction: column; text-align: center; }
    }