.date-calculator {
  max-width: 500px;
  margin: 40px auto;
  padding: 30px;
  background: #f9f9f9;
  border-radius: 12px;
  font-family: Arial, sans-serif;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
}

h1 {
  text-align: center;
  color: #004466;
}

h3 {
  margin-top: 30px;
  color: #333;
}

label {
  display: block;
  margin-top: 15px;
  font-weight: bold;
}

input[type="date"], input[type="number"], select {
  width: 100%;
  padding: 10px;
  margin-top: 6px;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-size: 14px;
}

button {
  width: 100%;
  margin-top: 20px;
  padding: 12px;
  background-color: #2e7d32;
  color: white;
  font-size: 16px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

button:hover {
  background-color: #1b5e20;
}

#dateDiffResult, #newDateResult {
  margin-top: 15px;
  font-size: 16px;
  color: #333;
  font-weight: bold;
}

hr {
  margin: 40px 0;
  border: none;
  border-top: 1px solid #ccc;
}