:root {
      --primary-color: rgb(255,45,85);
      --dark-bg: #060b26;
      --silver-white: #f5f7fa;
      --text-dark: #1f2937;
      --card-shadow: 0 10px 30px 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; background-color: var(--silver-white); color: var(--text-dark); line-height: 1.6; }
    a { color: inherit; text-decoration: none; transition: all 0.3s ease; }
    
    
    .site-header { background: #fff; box-shadow: 0 2px 10px rgba(0,0,0,0.05); position: sticky; top: 0; z-index: 1000; height: 70px; display: flex; align-items: center; }
    .header-container { width: 1200px; max-width: 95%; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; }
    
    .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-dark); white-space: nowrap; }
    
    .nav-menu { display: flex; gap: 24px; align-items: center; }
    .nav-menu a { font-size: 15px; font-weight: 500; color: #4b5563; padding: 8px 12px; border-radius: 6px; }
    .nav-menu a:hover { color: var(--primary-color); background: rgba(255,45,85,0.05); }
    
    
    .menu-toggle { display: none; background: none; border: none; font-size: 24px; cursor: pointer; color: var(--text-dark); }
    .mobile-drawer { position: fixed; top: 0; left: -100%; width: 100%; height: 100%; z-index: 2000; transition: left 0.4s cubic-bezier(0.16, 1, 0.3, 1); }
    .mobile-drawer.active { left: 0; }
    .drawer-overlay { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); backdrop-filter: blur(4px); }
    .drawer-content { position: absolute; top: 0; left: 0; width: 300px; height: 100%; background: #fff; padding: 24px; display: flex; flex-direction: column; gap: 30px; box-shadow: 4px 0 20px rgba(0,0,0,0.15); }
    .drawer-header { display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid #f3f4f6; padding-bottom: 15px; }
    .close-drawer { background: none; border: none; font-size: 28px; cursor: pointer; color: var(--text-dark); }
    .drawer-nav { display: flex; flex-direction: column; gap: 16px; }
    .drawer-nav a { font-size: 16px; font-weight: 600; padding: 10px 14px; border-radius: 8px; color: #374151; }
    .drawer-nav a:hover { background: rgba(255,45,85,0.08); color: var(--primary-color); }
    
    
    .breadcrumb-area { background: #f1f5f9; padding: 15px 0; border-bottom: 1px solid #e2e8f0; }
    .breadcrumb-container { width: 1200px; max-width: 95%; margin: 0 auto; font-size: 14px; color: #64748b; }
    .breadcrumb-container a { color: var(--text-dark); }
    
    
    .download-hero { background: radial-gradient(circle at top, #0c1535 0%, #060b26 100%); color: #fff; padding: 80px 0; text-align: center; }
    .download-hero h1 { font-size: 38px; font-weight: 800; margin-bottom: 15px; }
    .download-hero p { font-size: 16px; color: #94a3b8; max-width: 600px; margin: 0 auto; }
    
    .download-container { width: 1200px; max-width: 95%; margin: 60px auto 100px; }
    .download-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 40px; }
    .download-card { background: #fff; border-radius: 16px; padding: 40px; box-shadow: var(--card-shadow); border: 1px solid #f1f5f9; display: flex; flex-direction: column; gap: 24px; }
    .download-card h2 { font-size: 24px; font-weight: 800; color: var(--text-dark); display: flex; align-items: center; gap: 10px; }
    .download-card p { font-size: 14px; color: #64748b; line-height: 1.7; }
    
    .os-list { list-style: none; display: flex; flex-direction: column; gap: 12px; }
    .os-item { background: #f8fafc; border: 1px solid #e2e8f0; border-radius: 8px; padding: 14px 20px; display: flex; justify-content: space-between; align-items: center; }
    .os-item:hover { border-color: var(--primary-color); background: rgba(255,45,85,0.02); }
    .os-info { display: flex; align-items: center; gap: 12px; }
    .os-icon { font-size: 24px; color: var(--text-dark); }
    .os-name { font-size: 15px; font-weight: 700; color: var(--text-dark); }
    .btn-download { background: var(--primary-color); color: #fff; font-weight: 700; padding: 8px 18px; border-radius: 6px; font-size: 13px; }
    .btn-download:hover { background: var(--primary-hover); transform: scale(1.03); }
    
    
    .guide-section { background: #f8fafc; border-top: 1px solid #e2e8f0; padding: 80px 0; }
    .guide-container { width: 1200px; max-width: 95%; margin: 0 auto; }
    .guide-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; margin-top: 40px; }
    .guide-step { background: #fff; border-radius: 12px; padding: 30px; box-shadow: var(--card-shadow); border: 1px solid #e2e8f0; position: relative; }
    .step-num { position: absolute; top: -20px; left: 30px; width: 40px; height: 40px; border-radius: 50%; background: var(--primary-color); color: #fff; font-size: 18px; font-weight: 800; display: flex; align-items: center; justify-content: center; }
    .guide-step h3 { font-size: 18px; font-weight: 700; color: var(--text-dark); margin: 15px 0 10px; }
    .guide-step p { font-size: 13px; color: #64748b; line-height: 1.6; }
    
    
    .site-footer { background: #0f172a; color: #94a3b8; padding: 80px 0 30px; border-top: 1px solid #1e293b; font-size: 14px; }
    .footer-grid { width: 1200px; max-width: 95%; margin: 0 auto; display: grid; grid-template-columns: 2fr repeat(3, 1fr); gap: 40px; margin-bottom: 50px; }
    .footer-about .logo span { color: #fff; }
    .footer-about p { margin: 20px 0; line-height: 1.8; color: #64748b; }
    .footer-col h4 { color: #f8fafc; font-size: 16px; font-weight: 700; margin-bottom: 24px; position: relative; }
    .footer-col h4::after { content: ''; position: absolute; bottom: -8px; left: 0; width: 30px; height: 2px; background: var(--primary-color); }
    .footer-links-list { list-style: none; display: flex; flex-direction: column; gap: 12px; }
    .footer-links-list a:hover { color: #fff; padding-left: 5px; }
    .footer-bottom { border-top: 1px solid #1e293b; padding-top: 30px; width: 1200px; max-width: 95%; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 15px; font-size: 12px; color: #64748b; }
    
    @media(max-width: 992px) {
      .download-grid { grid-template-columns: 1fr; }
      .guide-grid { grid-template-columns: 1fr; gap: 40px; }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media(max-width: 768px) {
      .nav-menu { display: none; }
      .menu-toggle { display: block; }
      .footer-grid { grid-template-columns: 1fr; }
    }