body {
  font-family: Arial, sans-serif;
  background-color: #f5f5f5;
  margin: 0;
  padding: 20px;
  padding-top: 100px;
}

.calculator-container {
  max-width: 600px;
  margin: 0 auto;
  background: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

h1 {
  text-align: center;
  color: #333;
}

.input-group {
  margin-bottom: 15px;
  position: relative;
}

label {
  display: block;
  margin-bottom: 5px;
  font-weight: bold;
}

input, select {
  width: 100%;
  padding: 8px;
  border: 1px solid #ddd;
  border-radius: 4px;
}

button {
  width: 100%;
  padding: 10px;
  background-color: #007bff;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  background-color: #0056b3;
}

.result-container {
  margin-top: 20px;
  padding: 15px;
  background-color: #f0f0f0;
  border-radius: 4px;
}

.price, .greek {
  font-weight: bold;
  color: #007bff;
}

.tooltip {
  position: relative;
  display: inline-block;
  cursor: help;
}

.tooltip .tooltiptext {
  visibility: hidden;
  width: 220px;
  background-color: #555;
  color: #fff;
  text-align: center;
  border-radius: 6px;
  padding: 8px;
  position: absolute;
  z-index: 1;
  bottom: 125%;
  left: 50%;
  margin-left: -110px;
  opacity: 0;
  transition: opacity 0.3s;
  font-size: 14px;
  line-height: 1.4;
}

.tooltip:hover .tooltiptext {
  visibility: visible;
  opacity: 1;
}

.barrier-tooltip .tooltiptext {
  width: 280px;
  margin-left: -140px;
}