body {
  font-family: "Tahoma", Arial, sans-serif;
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
  background-color: #f5f5f5;
}

* {
  box-sizing: border-box;
}

.calculator-card {
  background: white;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  margin-bottom: 30px;
}

h1 {
  color: #2c3e50;
  margin-top: 0;
  margin-bottom: 25px;
}

.input-group {
  margin-bottom: 20px;
}

label {
  display: block;
  margin-bottom: 8px;
  color: #34495e;
  font-weight: bold;
}

input[type="date"] {
  width: 100%;
  padding: 10px;
  border: 2px solid #bdc3c7;
  border-radius: 5px;
  font-size: 16px;
}

button {
  background: #3498db;
  color: white;
  border: none;
  padding: 12px 25px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 16px;
  transition: background 0.3s;
}

button:hover {
  background: #2980b9;
}

.results-box {
  margin-top: 30px;
  padding: 20px;
  background: #f8f9fa;
  border-radius: 5px;
  line-height: 1.6;
}

.results-box h3 {
  margin-top: 0;
}

footer {
  text-align: center;
  padding: 20px;
  color: #7f8c8d;
}

footer p {
  font-size: 0.875rem;
  line-height: 1.5;
}

footer p a {
  color: #3498db;
  text-decoration: none;
}

footer p a:hover {
  text-decoration: underline;
}