body {
      box-sizing: border-box;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    html, body {
      height: 100%;
      width: 100%;
    }

    body {
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
      background: #fafafa;
      overflow-x: hidden;
    }

    .fade-in {
      animation: fadeIn 0.8s ease-out forwards;
      opacity: 0;
    }

    .slide-up {
      animation: slideUp 0.8s ease-out forwards;
      opacity: 0;
    }

    @keyframes fadeIn {
      from {
        opacity: 0;
      }
      to {
        opacity: 1;
      }
    }

    @keyframes slideUp {
      from {
        opacity: 0;
        transform: translateY(30px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    .stagger-1 { animation-delay: 0.1s; }
    .stagger-2 { animation-delay: 0.2s; }
    .stagger-3 { animation-delay: 0.3s; }
    .stagger-4 { animation-delay: 0.4s; }

    .card-hover {
      transition: all 0.3s ease;
    }

    .card-hover:hover {
      transform: translateY(-8px);
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
    }

    .btn-primary {
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      transition: all 0.3s ease;
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
    }

    .btn-secondary {
      transition: all 0.3s ease;
    }

    .btn-secondary:hover {
      background: #667eea;
      color: white;
    }

    .nav-link {
      position: relative;
      transition: color 0.3s ease;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: #667eea;
      transition: width 0.3s ease;
    }

    .nav-link:hover::after {
      width: 100%;
    }

    .hero-gradient {
      background: linear-gradient(135deg, #f5f7fa 0%, #e8eaf6 100%);
    }

    .product-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 2rem;
    }

    .blog-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
      gap: 2rem;
    }

    .workspace-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
      gap: 1.5rem;
    }

    .icon-box {
      width: 80px;
      height: 80px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 20px;
      font-size: 2.5rem;
      margin: 0 auto 1.5rem;
    }

    input:focus, textarea:focus {
      outline: none;
      border-color: #667eea;
      box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    }

    .page {
      display: none;
      animation: fadeIn 0.6s ease-out;
    }

    .page.active {
      display: block;
    }

    .modal {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.6);
      z-index: 9999;
      align-items: center;
      justify-content: center;
    }

    .modal.active {
      display: flex;
    }

    .modal-content {
      background: white;
      border-radius: 20px;
      padding: 1.5rem;
      max-width: 450px;
      width: 90%;
      max-height: 90%;
      overflow-y: auto;
      animation: slideUp 0.4s ease-out;
    }

    @media (min-width: 640px) {
      .modal-content {
        padding: 2rem;
      }
    }

    @media (min-width: 768px) {
      .modal-content {
        padding: 3rem;
      }
    }

    .toast {
      position: fixed;
      top: 20px;
      right: 20px;
      background: white;
      padding: 1rem 1.5rem;
      border-radius: 12px;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
      z-index: 10000;
      display: none;
      animation: slideUp 0.4s ease-out;
    }

    .toast.active {
      display: block;
    }

    .toast.success {
      border-left: 4px solid #10b981;
    }

    .toast.error {
      border-left: 4px solid #ef4444;
    }