:root {
      --primary-color: rgb(94,92,230);
      --text-dark: #1E293B;
      --text-light: #64748B;
      --bg-light: #F8FAFC;
      --border-color: #E2E8F0;
      --transition: all 0.3s ease;
    }

    * { margin: 0; padding: 0; box-sizing: border-box; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      color: var(--text-dark);
      background-color: #fff;
      line-height: 1.6;
    }

    
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-color);
    }
    .header-container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 16px 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .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; }
    .desktop-nav { display: flex; align-items: center; gap: 32px; }
    .desktop-nav a { color: var(--text-dark); text-decoration: none; font-weight: 500; font-size: 15px; transition: var(--transition); }
    .desktop-nav a:hover { color: var(--primary-color); }
    .header-actions { display: flex; align-items: center; gap: 16px; }
    .nav-btn { background: var(--primary-color); color: #fff; padding: 10px 24px; border-radius: 6px; text-decoration: none; font-weight: 600; font-size: 14px; transition: var(--transition); }
    .nav-btn:hover { opacity: 0.9; transform: translateY(-1px); }
    .mobile-menu-toggle { display: none; background: none; border: none; cursor: pointer; flex-direction: column; gap: 6px; padding: 4px; }
    .mobile-menu-toggle span { display: block; width: 24px; height: 2px; background: var(--text-dark); transition: var(--transition); }

    
    .drawer-overlay { position: fixed; top: 0; left: 0; width: 100vw; height: 100vh; background: rgba(0,0,0,0.5); z-index: 1999; opacity: 0; visibility: hidden; transition: var(--transition); }
    .drawer-overlay.active { opacity: 1; visibility: visible; }
    .mobile-drawer { position: fixed; top: 0; left: -280px; width: 280px; height: 100vh; background: #fff; z-index: 2000; transition: var(--transition); display: flex; flex-direction: column; box-shadow: 4px 0 24px rgba(0,0,0,0.15); }
    .mobile-drawer.active { left: 0; }
    .drawer-header { padding: 24px 20px; border-bottom: 1px solid var(--border-color); display: flex; justify-content: space-between; align-items: center; }
    .drawer-close { background: none; border: none; font-size: 28px; cursor: pointer; color: var(--text-light); }
    .drawer-content { padding: 24px 20px; flex-grow: 1; overflow-y: auto; }
    .mobile-nav { display: flex; flex-direction: column; gap: 20px; }
    .mobile-nav a { color: var(--text-dark); text-decoration: none; font-size: 16px; font-weight: 500; }
    .drawer-footer { padding: 24px 20px; border-top: 1px solid var(--border-color); text-align: center; }
    .drawer-btn { display: block; background: var(--primary-color); color: #fff; padding: 12px; border-radius: 6px; text-decoration: none; font-weight: 600; margin-top: 12px; }

    
    .down-main {
      max-width: 1200px;
      margin: 80px auto;
      padding: 0 20px;
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .down-info h1 {
      font-size: 38px;
      font-weight: 800;
      margin-bottom: 20px;
      line-height: 1.3;
    }
    .down-info p {
      color: var(--text-light);
      margin-bottom: 30px;
      font-size: 16px;
    }
    .platform-links {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .platform-btn {
      display: flex;
      align-items: center;
      gap: 12px;
      background: var(--text-dark);
      color: #fff;
      padding: 16px 24px;
      border-radius: 8px;
      text-decoration: none;
      font-weight: 600;
      transition: var(--transition);
    }
    .platform-btn:hover {
      background: var(--primary-color);
      transform: translateY(-2px);
    }
    .platform-btn span {
      display: block;
      font-size: 12px;
      font-weight: normal;
      opacity: 0.8;
    }
    .platform-btn strong {
      display: block;
      font-size: 16px;
    }
    .qr-side {
      background: var(--bg-light);
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 40px;
      text-align: center;
    }
    .qr-box {
      width: 200px;
      height: 200px;
      margin: 0 auto 24px;
      border: 1px dashed var(--primary-color);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: #fff;
      color: var(--primary-color);
      font-weight: 600;
      font-size: 14px;
    }
    .qr-side h3 {
      font-size: 20px;
      margin-bottom: 8px;
    }
    .qr-side p {
      color: var(--text-light);
      font-size: 14px;
    }

    
    .install-guide {
      background: var(--bg-light);
      padding: 80px 20px;
    }
    .guide-container {
      max-width: 1000px;
      margin: 0 auto;
    }
    .guide-container h2 {
      text-align: center;
      font-size: 28px;
      margin-bottom: 40px;
    }
    .guide-steps {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 30px;
    }
    .guide-card {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 30px;
    }
    .guide-card h3 {
      font-size: 18px;
      color: var(--primary-color);
      margin-bottom: 12px;
    }
    .guide-card p {
      font-size: 14px;
      color: var(--text-light);
    }

    
    .site-footer { background: #0B0F19; color: #94A3B8; padding: 80px 20px 30px; border-top: 1px solid rgba(255,255,255,0.05); }
    .footer-container { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 2fr repeat(3, 1fr); gap: 40px; margin-bottom: 60px; }
    .footer-brand .logo span { color: #fff; }
    .footer-brand p { margin-top: 20px; font-size: 14px; line-height: 1.8; max-width: 320px; }
    .footer-links h4 { color: #fff; margin-bottom: 24px; font-size: 16px; }
    .footer-links ul { list-style: none; }
    .footer-links ul li { margin-bottom: 12px; }
    .footer-links ul li a { color: #94A3B8; text-decoration: none; font-size: 14px; transition: var(--transition); }
    .footer-links ul li a:hover { color: #fff; }
    .footer-bottom { max-width: 1200px; margin: 0 auto; padding-top: 30px; border-top: 1px solid rgba(255,255,255,0.05); display: flex; justify-content: space-between; align-items: center; font-size: 13px; }

    @media (max-width: 991px) {
      .desktop-nav { display: none; }
      .mobile-menu-toggle { display: flex; }
      .down-main { grid-template-columns: 1fr; }
    }
    @media (max-width: 600px) {
      .platform-links { grid-template-columns: 1fr; }
      .footer-container { grid-template-columns: 1fr; }
      .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
    }