html { scroll-behavior: smooth; }
      body { background: #f7f9fc; color: #333; font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; margin: 0; padding: 0; overflow-x: hidden; }
      
      .header { padding: 10px 5%; }
      .header .logo-container { display: flex; align-items: center; justify-content: flex-start; margin-bottom: 10px; }
      .header .logo { height: 90px; margin-right: 20px; mix-blend-mode: multiply; }
      .header h1 { font-family: 'Inter', sans-serif; font-size: 3rem; font-weight: 700; color: #1a202c; margin: 0; }
      .header h2 { font-family: 'Inter', sans-serif; font-size: 2rem; font-weight: 600; color: #2d3748; margin: 0; }
      .main-content { padding: 40px 20px; text-align: center; }
      .main-content p { font-family: 'Inter', sans-serif; font-size: 1.1rem; line-height: 1.6; color: #2d3748; margin: 0 0 20px; }
      .footer { margin-top: 60px; padding: 40px 20px 20px; border-top: 1px solid #e2e8f0; text-align: center; }
      .footer-links { margin-bottom: 20px; }
      .footer-links a { color: #4a5568; text-decoration: none; margin: 0 10px; font-weight: 500; }
      .footer-links a:hover { text-decoration: underline; color: #1d4ed8; }
      .footer-business-info { margin: 15px 0; font-size: 0.9rem; color: #4a5568; }
      .footer p { font-family: 'Inter', sans-serif; font-size: 0.875rem; color: #718096; line-height: 1.5; margin: 0 0 10px; }
      .home-link { display: inline-block; margin-top: 20px; color: #2563eb; text-decoration: none; font-weight: 600; }
      .home-link:hover { text-decoration: underline; }

      /* Professional Sidebar Menu Styles */
      .menu-icon { 
        font-size: 30px; 
        cursor: pointer; 
        position: fixed; 
        top: 20px; 
        right: 20px; 
        z-index: 1100; 
      }
      
      .dropdown-menu { 
        display: block !important; 
        position: fixed; 
        top: 0 !important; 
        right: 0 !important; 
        height: 100vh !important; 
        width: 200px; 
        background-color: rgba(255, 255, 255, 0.95); 
        backdrop-filter: blur(15px);
        box-shadow: -10px 0 30px rgba(0,0,0,0.15); 
        z-index: 2000; 
        text-align: left; 
        transform: translateX(105%); 
        transition: transform 0.4s ease; 
        padding-top: 20px;
        box-sizing: border-box;
      }

      .dropdown-menu.show { 
        transform: translateX(0); 
      }

      .dropdown-menu a { 
        display: block; 
        padding: 18px 30px; 
        text-decoration: none; 
        color: #2d3748; 
        font-weight: 500; 
        font-size: 1.1rem;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        border-bottom: 1px solid #f1f5f9;
        border-right: 4px solid transparent;
      }

      .dropdown-menu a:hover { 
        background-color: rgba(37, 99, 235, 0.05); 
        padding-right: 35px;
        color: #2563eb;
        border-right: 4px solid #2563eb;
      }

      .menu-footer {
        position: absolute;
        bottom: 20px;
        left: 30px;
        font-size: 0.8rem;
        color: #718096;
      }

      .product-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; text-align: left; }
      .product-item { background: transparent; padding: 20px; border-radius: 8px; border-bottom: 1px solid #e2e8f0; }
      .product-item h3 { margin-top: 0; }
      .product-item ul { padding-left: 20px; }
      .product-image { width: 100%; max-width: 200px; height: auto; border-radius: 8px; margin-bottom: 15px; }

      .carousel-container { width: 100%; overflow-x: auto; margin-top: 40px; }
      .carousel-container:hover .carousel-track { animation-play-state: paused; }
      .carousel-track { display: flex; width: fit-content; animation: scroll 30s linear infinite; }
      .carousel-item { flex: 0 0 auto; width: 200px; margin: 0 20px; text-align: center; }
      .carousel-item a { text-decoration: none; color: inherit; }
      .carousel-item img { width: 100%; border-radius: 8px; }
      .cta-button { display: inline-block; background-color: #2563eb; color: #ffffff; padding: 15px 30px; text-decoration: none; font-family: 'Inter', sans-serif; font-size: 1rem; font-weight: 600; border-radius: 8px; transition: background-color 0.3s; border: none; cursor: pointer; width: 240px; box-sizing: border-box; text-align: center; }
      .cta-button:hover { background-color: #1d4ed8; }
      .price { font-size: 1.25rem; font-weight: 600; color: #2563eb; margin-bottom: 10px; }
      .whatsapp-logo img { width: 100px; height: 100px; }
      .whatsapp-cta { background: #eef2ff; padding: 20px; border-radius: 8px; margin-bottom: 40px; text-align: center; }
      .whatsapp-cta p { margin-top: 0; margin-bottom: 15px; font-size: 1.2rem; font-weight: 500; color: #1c3d5a; }

      .policy-content { text-align: left; }
      .policy-content h3 { margin-top: 30px; margin-bottom: 15px; }
      .policy-content p, .policy-content ul { margin-bottom: 15px; }
      .policy-content ul { padding-left: 20px; }
      .policy-content li { margin-bottom: 10px; }

      .success-message { position: fixed; bottom: 90px; right: 20px; background-color: #4CAF50; color: white; padding: 15px; border-radius: 5px; z-index: 1000; opacity: 0; transition: opacity 0.5s; }
      .success-message.show { opacity: 1; }
      
      .view-cart-fixed { position: fixed; bottom: 20px; right: 20px; z-index: 1001; }
      .cart-actions { display: flex; justify-content: space-between; align-items: center; margin-top: 20px; }

      @keyframes scroll { from { transform: translateX(0); } to { transform: translateX(-50%); } }
      @media (max-width: 768px) { 
        .header { padding: 10px 5% 20px; align-items: flex-start; } 
        .header h1 { font-size: 2.5rem; } 
        .header h2 { font-size: 1.75rem; } 
        .menu-icon { top: 10px; color: #000000; }
        .dropdown-menu { width: 50% !important; max-width: 200px; }
        /* sidebar position is independent on mobile due to fixed positioning */
      }

      /* --- Research Peptides Section --- */
      .research-peptides-section { padding: 60px 20px; text-align: center; }
      .research-peptides-section h2 { font-size: 2.5rem; font-weight: 700; margin-bottom: 20px; color: #1a202c; }
      .research-peptides-section > p { font-size: 1.1rem; color: #4a5568; margin-bottom: 40px; max-width: 800px; margin-left: auto; margin-right: auto; }
      .features-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 40px; max-width: 1200px; margin: 0 auto; }
      .feature-item { text-align: center; }
      .feature-item img { width: 50px; height: 50px; margin-bottom: 20px; }
      .feature-item h3 { font-size: 1.5rem; font-weight: 600; margin-bottom: 10px; color: #2d3748; }
      .feature-item p { font-size: 1rem; line-height: 1.6; color: #4a5568; }
      @media (max-width: 768px) { .features-grid { grid-template-columns: repeat(2, 1fr); } }
      .dropdown-menu a.active {
        color: #2563eb;
        font-weight: 600;
        background-color: rgba(37, 99, 235, 0.05);
        border-right-color: #2563eb;
      }