body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
  background: #fafafa;
  color: #333;
}
header {
  background: #2b6cb0;
  color: white;
  padding: 20px;
  text-align: center;
}
main {
  max-width: 900px;
  margin: 20px auto;
  padding: 20px;
  background: white;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
h1, h2 {
  color: #2b6cb0;
}
.card {
  text-align: center;
  margin: 20px 0;
  padding: 20px;
  background: #f5f5f5;
  border-radius: 12px;
}
.price {
  font-size: 24px;
  font-weight: bold;
  color: #2b6cb0;
}
.btn-group {
  text-align: center;
  margin: 15px 0;
}
button {
  background: #2b6cb0;
  color: white;
  border: none;
  padding: 8px 16px;
  margin: 0 5px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
}
button:hover {
  background: #234e7a;
}
canvas {
  max-width: 800px;
  margin: 0 auto;
}
.calculator {
  margin-top: 25px;
  text-align: center;
}
.calculator input {
  padding: 8px;
  margin: 5px;
  border: 1px solid #ccc;
  border-radius: 6px;
  width: 150px;
}
.calc-result {
  margin-top: 10px;
  font-size: 18px;
  font-weight: bold;
  color: #2b6cb0;
}