body {
      margin: 0;
      font-family: Arial, sans-serif;
      background: #e9f1f5;
    }
    header, section, footer {
      padding: 40px 20px;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      text-align: center;
    }
    h2 {
      margin-top: 0;
    }
.nav {
  background: #ffffff;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  margin-bottom: 20px;
}
.nav img {
  height: 40px;
}
.nav-links {
  display: flex;
  gap: 16px;
}
.nav-link {
  color: #003f5c;
  text-decoration: none;
  font-weight: 600;
}
.nav-link:hover {
  color: #007acc;
}
    #languageSelect {
      margin-left: 16px;
      padding: 6px;
      font-weight: 600;
      border-radius: 6px;
      border: 1px solid #ccc;
    }
    #hero-logo {
      height: 360px;
      display: block;
      margin: 0 auto 40px auto;
      animation: fadeInUp 1s ease-out;
      filter: drop-shadow(0 0 12px #00bfff);
    }
    @keyframes fadeInUp {
      from { opacity: 0; transform: translateY(30px); }
      to { opacity: 1; transform: translateY(0); }
    }
    @media (max-width: 768px) {
      #hero-logo { height: 180px; }
    }
    .note {
      font-size: 0.9em;
      color: #666;
      margin-top: 10px;
    }
    .btn-download, .btn-link {
      display: inline-block;
      background: #28a745;
      color: white;
      padding: 12px 24px;
      margin: 10px;
      border-radius: 8px;
      text-decoration: none;
      transition: background 0.3s ease;
    }
    .btn-link:hover, .btn-download:hover {
      background: #1e7e34;
    }
    ul {
      text-align: left;
      max-width: 600px;
      margin: 0 auto;
    }
    code {
      background: #eee;
      padding: 2px 6px;
      border-radius: 4px;
    }