body {
  font-family: system-ui, sans-serif;
  background: #f4f6f8;
  margin: 0; padding: 20px;
}
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.card {
  background: #fff;
  padding: 16px;
  margin: 16px 0;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0,0,0,.08);
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit,minmax(200px,1fr));
  gap: 12px;
}
input, select {
  padding: 10px;
  font-size: 14px;
}
button {
  padding: 10px 16px;
  font-weight: 600;
  cursor: pointer;
}
.hidden { display: none; }
table {
  width: 100%; border-collapse: collapse;
}
th, td {
  padding: 8px; border-bottom: 1px solid #ddd;
}
.totals { text-align: right; }
@media print {
  button { display: none; }
  body { background: #fff; }
}