.calculator-container {
  text-align: center;
  padding: 2rem;
  background: white;
  border-radius: 15px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  max-width: 500px;
  margin: 0 auto;
}

.input-group {
  margin: 2rem 0;
  text-align: left;
}

.input-group label {
  display: block;
  margin-bottom: 0.5rem;
  color: #2c3e50;
}

input[type="date"] {
  width: 100%;
  padding: 0.8rem;
  border: 1px solid #ddd;
  border-radius: 5px;
  font-size: 1rem;
}

button {
  background: #3498db;
  color: white;
  padding: 0.8rem 1.5rem;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 1rem;
  transition: background 0.3s;
}

button:hover {
  background: #2980b9;
}

.calculator-modes {
  margin-bottom: 2rem;
}

.calculator-modes button {
  background: #ecf0f1;
  color: #2c3e50;
  margin: 0 0.5rem;
}

.calculator-modes button.active {
  background: #3498db;
  color: white;
}

.result {
  margin-top: 2rem;
  padding: 1rem;
  border-radius: 5px;
  font-size: 1.2rem;
  color: #2c3e50;
}

#between-dates label {
  margin-top: 1rem;
}