:root {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: #1f2937;
  background: #f3f4f6;
}

body {
  margin: 0;
  padding: 0;
}

.app {
  max-width: 960px;
  margin: 24px auto;
  padding: 16px;
}

h1,
h2,
h3 {
  margin-top: 0;
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 16px;
}

.product-row,
.cart-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid #e5e7eb;
  padding: 10px 0;
}

.product-row:last-child,
.cart-row:last-child {
  border-bottom: none;
}

button {
  border: none;
  background: #111827;
  color: white;
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
}

button.secondary {
  background: #4b5563;
}

input,
select {
  padding: 8px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
}

.row {
  display: flex;
  gap: 8px;
  align-items: center;
  margin: 8px 0;
}

.total {
  font-size: 18px;
  font-weight: 700;
  margin-top: 12px;
}

.status {
  margin-top: 12px;
  padding: 10px;
  background: #f9fafb;
  border-radius: 8px;
  border: 1px solid #e5e7eb;
  white-space: pre-wrap;
}

.qr {
  margin-top: 12px;
  max-width: 240px;
}

.sales-list {
  margin-top: 12px;
}

.sales-row {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 8px;
  border-bottom: 1px solid #e5e7eb;
  padding: 8px 0;
  font-size: 14px;
}

@media (max-width: 800px) {
  .grid {
    grid-template-columns: 1fr;
  }
}