body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  overflow: hidden;
  padding: 0 20px;
}

header {
  background: linear-gradient(90deg, #007bff, #00b8ff);
  color: #fff;
  padding: 20px;
}

header img {
  display: block;
  margin: 0 auto;
  max-width: 200px;
}

h1 {
  text-align: center;
}

main {
  padding: 20px;
}

.hidden {
  display: none;
}

button {
  background-color: #007bff;
  border: none;
  color: white;
  padding: 12px 20px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin: 10px 2px;
  cursor: pointer;
  border-radius: 4px;
  transition: background-color 0.3s;
}

button:hover {
  background-color: #0056b3;
}

select {
  padding: 8px 16px;
  border: 1px solid #ccc;
  border-radius: 4px;
  font-size: 16px;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-color: #fff;
  background-image: url('data:image/svg+xml,%3Csvg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 4 5"%3E%3Cpath fill="%23ccc" d="M2 3.5L.5 2h3zm0-3L.5 5h3z"/%3E%3C/svg%3E');
  background-repeat: no-repeat;
  background-position: right 0.7em top 50%;
  background-size: 8px;
}

.fade-animation {
  opacity: 0;
  transition: opacity 0.3s;
}