body {
  font-family: Arial, sans-serif;
  background-color: #f2f2f2;
  margin: 0;
  padding: 20px;
}

.container {
  max-width: 420px;
  margin: auto;
  background: #ffffff;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  text-align: center;
}

h1 {
  font-size: 22px;
  margin-bottom: 20px;
}

#rate {
  font-weight: bold;
  margin-bottom: 20px;
  font-size: 16px;
}

.converter {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.input-group {
  display: flex;
  flex-direction: column;
  text-align: left;
}

label {
  margin-bottom: 5px;
  font-weight: 600;
}

input {
  padding: 10px;
  font-size: 16px;
  border-radius: 8px;
  border: 1px solid #ccc;
  transition: border 0.2s;
}

input:focus {
  outline: none;
  border-color: #007bff;
}

#swap {
  font-size: 20px;
  padding: 8px 12px;
  border-radius: 50%;
  border: none;
  background-color: #007bff;
  color: white;
  width: 44px;
  height: 44px;
  margin: auto;
  cursor: pointer;
  transition: background 0.3s;
}

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