:root {
  --primary-color: #2c3e50;
  --accent-color: #3498db;
  --border-color: #bdc3c7;
}
body {
  font-family: Arial, sans-serif;
  font-size: 10pt;
  margin: 40pt;
}
.header {
  border-bottom: 2pt solid var(--primary-color);
  margin-bottom: 20pt;
  padding-bottom: 10pt;
}
.invoice-title {
  color: var(--primary-color);
  font-size: 28pt;
  font-weight: bold;
}
.invoice-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 20pt;
}
.invoice-table th {
  background-color: var(--primary-color);
  color: white;
  padding: 8pt;
  text-align: left;
}
.invoice-table td {
  border-bottom: 1pt solid var(--border-color);
  padding: 8pt;
}
.total-row {
  font-weight: bold;
  font-size: 12pt;
  background-color: #ecf0f1;
}