#keibaApp {
  font-family: 'Arial', sans-serif;
  max-width: 650px;
  margin: auto;
  padding: 20px;
  border-radius: 15px;
  background: #f8f9fa;
  color: #333;
  box-shadow: 0 0 20px rgba(0,0,0,0.1);
}
#keibaApp h2 {
  color: #28a745;
  border-bottom: 2px solid #ccc;
  padding-bottom: 10px;
  margin-bottom: 20px;
}
#keibaApp label {
  display: block;
  margin: 12px 0 5px;
  font-weight: bold;
}
#keibaApp input, #keibaApp select {
  width: 100%;
  padding: 8px;
  border: 1px solid #ccc;
  border-radius: 5px;
  margin-bottom: 12px;
  background: #fff;
}
#keibaApp input[type="radio"] {
  width: auto;
  margin-right: 6px;
}
#keibaApp button {
  background: #007bff;
  color: #fff;
  border: none;
  padding: 12px 20px;
  border-radius: 5px;
  cursor: pointer;
  font-weight: bold;
  width: 100%;
}
#keibaApp button:hover {
  background: #0056b3;
}
#result {
  margin-top: 20px;
  padding: 15px;
  background: #e9ecef;
  border-left: 4px solid #28a745;
  border-radius: 10px;
  white-space: pre-wrap;
}