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

  body {
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
      line-height: 1.8;
      color: #333;
      background: #f5f5f5;
  }

  header {
      background: #fff;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
      position: sticky;
      top: 0;
      z-index: 100;
  }

  nav {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
      height: 70px;
      display: flex;
      justify-content: space-between;
      align-items: center;
  }

  .logo {
      font-size: 24px;
      font-weight: bold;
      color: #2c3e50;
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 10px;
  }

  .logo img {
      height: 40px;
      width: auto;
  }

  .nav-links {
      display: flex;
      gap: 30px;
  }

  .nav-links a {
      text-decoration: none;
      color: #555;
      font-size: 16px;
      transition: color 0.3s;
  }

  .nav-links a:hover,
 .nav-links a.active {
     color: #3498db;
 }

 .nav-links a.active {
     font-weight: bold;
     position: relative;
 }

 .nav-links a.active::after {
     content: '';
     position: absolute;
     bottom: -5px;
     left: 0;
     width: 100%;
     height: 2px;
     background: #3498db;
 }

  main {
      max-width: 1000px;
      margin: 40px auto;
      padding: 0 20px;
  }

  .back-link {
      display: inline-block;
      margin-top: 30px;
      padding: 10px 20px;
      background: #3498db;
      color: #fff;
      text-decoration: none;
      border-radius: 5px;
      transition: background 0.3s;
  }

  .back-link:hover {
      background: #2980b9;
  }

  article {
      background: #fff;
      padding: 40px;
      border-radius: 8px;
      box-shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
  }

  h1 {
      font-size: 32px;
      color: #2c3e50;
      margin-bottom: 20px;
      line-height: 1.4;
  }

  .meta {
      color: #888;
      font-size: 14px;
      margin-bottom: 30px;
      padding-bottom: 20px;
      border-bottom: 1px solid #eee;
  }

  .meta span {
      margin-right: 20px;
  }

  .tag {
      display: inline-block;
      background: #3498db;
      color: #fff;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      margin-right: 10px;
  }

  .content {
      font-size: 16px;
      line-height: 1.9;
  }

  .content p {
      margin-bottom: 20px;
      text-indent: 2em;
  }

  .content h2 {
      font-size: 24px;
      color: #2c3e50;
      margin: 30px 0 15px;
  }

  .content h3 {
      font-size: 20px;
      color: #34495e;
      margin: 25px 0 12px;
  }

  .content ul,
  .content ol {
      margin: 20px 0;
      padding-left: 40px;
  }

  .content li {
      margin-bottom: 10px;
  }

  footer {
     background: #2c3e50;
     color: #fff;
     text-align: center;
     padding: 30px 20px;
     margin-top: 60px;
 }

 footer p {
     margin-bottom: 10px;
 }

 .footer-nav {
     margin-top: 20px;
     display: flex;
     justify-content: center;
     gap: 30px;
 }

 .footer-nav a {
     color: #ecf0f1;
     text-decoration: none;
     font-size: 14px;
     transition: color 0.3s;
 }

 .footer-nav a:hover {
     color: #3498db;
 }

 .contact-qr-codes {
     display: flex;
     justify-content: center;
     gap: 40px;
     margin-top: 30px;
     flex-wrap: wrap;
 }

 .qrcode-item {
     text-align: center;
     padding: 20px;
     background: #f9f9f9;
     border-radius: 8px;
     box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
 }

 .qrcode-img {
     width: 180px;
     height: 180px;
     object-fit: contain;
     border-radius: 4px;
     margin-bottom: 10px;
 }

 .qrcode-item p {
     margin: 0;
     font-size: 14px;
     color: #666;
     font-weight: 500;
 }

 @media (max-width: 768px) {
     .contact-qr-codes {
         flex-direction: column;
         gap: 20px;
     }

     .qrcode-item {
         width: 100%;
         max-width: 300px;
     }

     .qrcode-img {
         width: 150px;
         height: 150px;
     }
 }