.calculator-container {
  max-width: 500px;
  margin: 0 auto;
  background: #f8f9fa;
  padding: 25px;
  border-radius: 16px;
  box-shadow: 0 6px 15px rgba(0,0,0,0.1);
  font-family: 'Segoe UI', sans-serif;
  color: #333;
}

.calculator-container h2 {
  text-align: center;
  margin-bottom: 20px;
  color: #1e73be;
}

.form-group {
  margin-bottom: 15px;
}

.form-group label {
  font-weight: 600;
  display: block;
  margin-bottom: 5px;
}

.form-group i {
  margin-right: 8px;
  color: #1e73be;
}

input, select {
  width: 100%;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid #ccc;
}

.calculate-btn {
  width: 100%;
  padding: 10px;
  background: #1e73be;
  color: white;
  border: none;
  border-radius: 8px;
  font-weight: bold;
  cursor: pointer;
  margin-top: 10px;
}

.result {
  margin-top: 20px;
  font-size: 1.2em;
  font-weight: bold;
  color: #1e73be;
  text-align: center;
}

table {
  width: 100%;
  margin-top: 15px;
  border-collapse: collapse;
}

th, td {
  text-align: center;
  padding: 8px;
  border-bottom: 1px solid #ddd;
}

th {
  background-color: #1e73be;
  color: #fff;
}

@media (max-width: 600px) {
  .calculator-container {
    padding: 15px;
  }
}