:root {
  --primary: #3498db;
  --muted: #666;
}
* {
  box-sizing: border-box;
}
body {
  font-family: Arial, sans-serif;
  margin: 18px;
  line-height: 1.4;
  color: #222;
}
h1 {
  margin: 0 0 6px;
  color: #2c3e50;
}
.muted {
  color: var(--muted);
  font-size: 0.95rem;
}
.form-area {
  margin: 12px 0;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
input[type="text"],
input[type="number"] {
  padding: 8px;
  border: 1px solid #ccc;
  border-radius: 6px;
  min-width: 140px;
}
label {
  display: flex;
  align-items: center;
  gap: 6px;
}
button {
  padding: 8px 12px;
  background: var(--primary);
  color: #fff;
  border: 0;
  border-radius: 6px;
  cursor: pointer;
}
button:hover {
  opacity: 0.95;
}
table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 8px;
}
th,
td {
  padding: 10px;
  border: 1px solid #e6e6e6;
  text-align: center;
}
.totals {
  margin-top: 12px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  align-items: center;
}
.totals .grand {
  grid-column: 1/-1;
  font-weight: 700;
  font-size: 1.15rem;
}
.actions {
  margin-top: 12px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
@media (max-width: 600px) {
  .totals {
    grid-template-columns: 1fr;
  }
}