body {
  font-family: 'Segoe UI', sans-serif;
  background: #f4f6f8;
  margin: 0;
  padding: 20px;
}

.converter-container {
  max-width: 500px;
  margin: 40px auto;
  background: #ffffff;
  border-radius: 16px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.1);
  padding: 30px;
  text-align: center;
}

h1 {
  font-size: 24px;
  color: #222;
  margin-bottom: 30px;
}

.converter-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.input-group {
  flex: 1;
  display: flex;
  flex-direction: column;
  text-align: left;
}

.input-group label {
  font-weight: 600;
  margin-bottom: 6px;
  color: #333;
}

.input-group input {
  padding: 12px;
  border: 1px solid #ccc;
  border-radius: 10px;
  font-size: 16px;
}

#swapBtn {
  background: #007bff;
  color: #fff;
  border: none;
  padding: 12px 16px;
  font-size: 20px;
  border-radius: 10px;
  cursor: pointer;
  align-self: flex-end;
  margin-bottom: 10px;
  transition: background 0.3s ease;
}

#swapBtn:hover {
  background: #0056b3;
}

.note {
  margin-top: 20px;
  font-size: 14px;
  color: #666;
}