body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f2f4f7;
}

.container {
  max-width: 420px;
  margin: auto;
  background: #ffffff;
  padding: 20px;
  min-height: 100vh;
}

.logo {
  width: 120px;
  display: block;
  margin: 0 auto 10px;
}

h2 {
  text-align: center;
}

.desc {
  text-align: center;
  color: #666;
  font-size: 14px;
}

.btn-download {
  display: block;
  background: #007bff;
  color: #fff;
  text-align: center;
  padding: 15px;
  border-radius: 10px;
  text-decoration: none;
  font-size: 18px;
  margin: 20px 0;
}

.btn-download:active {
  background: #0056b3;
}

.version {
  text-align: center;
  font-size: 14px;
}

details {
  margin-top: 15px;
}