body {
  font-family: Arial, sans-serif;
  background: #f9f9f9;
  margin: 0;
  padding: 20px;
  display: flex;
  justify-content: center;
}

.calculator-container {
  width: 50%;
  max-width: 600px;
  background: #fff;
  padding: 25px;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgb(0 0 0 / 50%);
}

h2 {
  text-align: center;
  color: #333;
  margin-bottom: 20px;
}

.calc-block {
  margin-bottom: 25px;
  padding: 20px;
  border: 2px solid #d6d6d6;
  border-radius: 10px;
  background: #fafafa;
}

.input-group {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

input {
  padding: 10px;
  border-radius: 6px;
  border: 1px solid #ccc;
  flex: 1;
  min-width: 100px;
  font-size: 16px;
}

button {
  padding: 10px 16px;
  border: none;
  border-radius: 6px;
  background: #007BFF;
  color: white;
  font-size: 16px;
  cursor: pointer;
  transition: 0.3s;
}

button:hover {
  background: #0056b3;
}

.result {
  margin-top: 12px;
  padding: 12px;
  background: #e8f5e9;
  border: 1px solid #c8e6c9;
  border-radius: 8px;
  font-weight: bold;
  color: #2e7d32;
}