body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    background: #f9f9f9;
    color: #333;
  }
  
  .header {
    background: #0044cc;
    color: #fff;
    padding: 1rem;
    text-align: center;
  }
  
  .search-bar {
    margin-top: 1rem;
    padding: 0.5rem;
    width: 80%;
    max-width: 400px;
    border: none;
    border-radius: 5px;
  }
  
  .faq-section {
    padding: 1rem;
    max-width: 700px;
    margin: auto;
  }
  
  .faq-item {
    margin-bottom: 1rem;
  }
  
  .faq-question {
    width: 100%;
    padding: 1rem;
    text-align: left;
    background: #fff;
    border: 1px solid #ddd;
    cursor: pointer;
    border-radius: 5px;
  }
  
  .faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    background: #eef;
    padding: 0 1rem;
    border-radius: 0 0 5px 5px;
  }
  
  .faq-answer.visible {
    max-height: 200px;
    padding: 1rem;
  }
  
  .contact-button {
    display: block;
    margin: 2rem auto;
    padding: 0.75rem 2rem;
    background: #0044cc;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
  }
  
  footer {
    text-align: center;
    padding: 1rem;
    background: #eee;
  }
  body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 20px;
    background: linear-gradient(to right, #e0eafc, #cfdef3);
    transition: background-color 0.5s ease;
  }
  
  .container {
    max-width: 900px;
    margin: auto;
    background: #ffffff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease;
    animation: fadeIn 1s ease-out;
  }
  
  @keyframes fadeIn {
    from {
      opacity: 0;
      transform: translateY(30px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
  
  h1 {
    text-align: center;
    color: #222;
    font-size: 2rem;
    margin-bottom: 20px;
    position: relative;
  }
  
  h1::after {
    content: '';
    display: block;
    width: 80px;
    height: 3px;
    background: #007BFF;
    margin: 10px auto 0;
    border-radius: 3px;
    animation: expandLine 1s ease-in-out;
  }
  
  @keyframes expandLine {
    from {
      width: 0;
    }
    to {
      width: 80px;
    }
  }
  
  .tabs {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
    margin-top: 30px;
  }
  
  .tab {
    padding: 12px 24px;
    background: #007BFF;
    color: white;
    border-radius: 30px;
    cursor: pointer;
    font-weight: bold;
    transition: background 0.3s ease, transform 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 123, 255, 0.2);
  }
  
  .tab:hover {
    background-color: #0056b3;
    transform: translateY(-2px);
  }
  
  .tab.active {
    background-color: #004a99;
  }
  
  .content-section {
    display: none;
    opacity: 0;
    transition: opacity 0.5s ease;
    margin-top: 30px;
    animation: slideUp 0.6s ease-in-out;
  }
  
  .content-section.active {
    display: block;
    opacity: 1;
  }
  
  @keyframes slideUp {
    from {
      opacity: 0;
      transform: translateY(20px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
  
  h2 {
    color: #007BFF;
    margin-top: 20px;
  }
  
  ul {
    padding-left: 20px;
  }
  
  li {
    margin-bottom: 10px;
    position: relative;
    padding-left: 10px;
  }
  
  li::before {
    content: '•';
    color: #007BFF;
    font-weight: bold;
    position: absolute;
    left: 0;
  }
  
  p {
    color: #444;
    line-height: 1.6;
  }
  
  table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
    animation: fadeInTable 0.6s ease-in-out;
  }
  
  @keyframes fadeInTable {
    from {
      opacity: 0;
      transform: scale(0.98);
    }
    to {
      opacity: 1;
      transform: scale(1);
    }
  }
  
  th, td {
    border: 1px solid #ccc;
    padding: 12px;
    text-align: left;
  }
  
  th {
    background-color: #007BFF;
    color: white;
  }
  
  img, video {
    max-width: 100%;
    margin-top: 20px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease;
  }
  
  img:hover, video:hover {
    transform: scale(1.01);
  }
  
  a.back-link {
    display: inline-block;
    margin-top: 40px;
    text-decoration: none;
    color: #007BFF;
    font-weight: bold;
    transition: color 0.3s ease;
  }
  
  a.back-link:hover {
    color: #0056b3;
  }

  .diagram-container {
    margin-top: 40px;
    background: #eaf4ff;
    border: 2px solid #007BFF;
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    font-family: 'Segoe UI', sans-serif;
  }
  
  .diagram-box {
    background: #ffffff;
    border: 2px dashed #007BFF;
    padding: 15px 20px;
    margin: 10px auto;
    border-radius: 8px;
    font-weight: bold;
    color: #007BFF;
    transition: transform 0.3s;
  }
  
  .diagram-box:hover {
    transform: scale(1.02);
  }
  
  .diagram-arrow {
    font-size: 24px;
    color: #007BFF;
    margin: 10px 0;
  }
  
  .diagram-options {
    display: flex;
    justify-content: space-around;
    margin-top: 20px;
    gap: 20px;
  }
  
  .diagram-options div {
    background: #fff;
    border: 2px solid #ccc;
    border-radius: 8px;
    padding: 15px;
    flex: 1;
    transition: background 0.3s ease;
  }
  
  .diagram-options div:hover {
    background: #f5fbff;
  }
  .diagram-arrow {
    animation: bounceDown 1.2s infinite;
  }
  
  @keyframes bounceDown {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(8px); }
  }  

  @media (max-width: 480px) {
    .tabs {
      flex-direction: column;
      gap: 10px;
    }
    .tab {
      width: 100%;
      text-align: center;
    }
  }