:root {
  --bg: #f4f4f5;
  --panel: #ffffff;
  --text: #18181b;
  --muted: #71717a;
  --border: #e4e4e7;
  --primary: #f59e0b;
  --primary-dark: #d97706;
  --success: #16a34a;
  --danger: #dc2626;
  --shadow: 0 10px 25px rgba(0, 0, 0, 0.07);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.app-header {
  background: #18181b;
  color: white;
  padding: 22px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}

.app-header h1 { margin: 0 0 4px; }
.app-header p { margin: 0; color: #d4d4d8; }

.layout {
  display: grid;
  grid-template-columns: 0.95fr 1.25fr 1fr 1fr;
  gap: 18px;
  padding: 18px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 18px;
  box-shadow: var(--shadow);
}

.section-title {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  margin-bottom: 14px;
}

.section-title h2 { margin: 0; }
.section-title span { color: var(--muted); font-size: 14px; }

.tables-grid, .products-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.table-card, .product-card {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  background: #fafafa;
  cursor: pointer;
  transition: 0.15s ease;
}

.table-card:hover, .product-card:hover {
  transform: translateY(-1px);
  border-color: var(--primary);
}

.table-card.active {
  background: #fff7ed;
  border-color: var(--primary);
}

.product-card.no-stock {
  opacity: 0.55;
  border-color: #fecaca;
}

.table-card strong, .product-card strong { display: block; margin-bottom: 5px; }
.table-card span, .product-card span { color: var(--muted); font-size: 14px; }

.street-sale-box { margin-bottom: 16px; }

.btn {
  border: 0;
  border-radius: 12px;
  padding: 11px 14px;
  font-weight: 700;
  cursor: pointer;
  background: #e4e4e7;
  color: #18181b;
}

.btn:hover { filter: brightness(0.96); }
.btn-primary { background: var(--primary); color: #18181b; }
.btn-success { background: var(--success); color: white; }
.btn-danger { background: var(--danger); color: white; }
.full { width: 100%; }

.cart-box { margin-top: 18px; border-top: 1px solid var(--border); padding-top: 14px; }
.cart-list, .history-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 260px;
  overflow: auto;
}

.empty { color: var(--muted); font-size: 14px; }

.cart-item, .history-item {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  border: 1px solid var(--border);
  background: #fafafa;
  padding: 10px;
  border-radius: 12px;
}

.remove-btn {
  background: transparent;
  border: 0;
  color: var(--danger);
  cursor: pointer;
  font-weight: 700;
}

.cart-total {
  margin: 14px 0;
  display: flex;
  justify-content: space-between;
  font-size: 22px;
}

.actions-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.actions-row.compact { margin-top: 10px; }

.summary-card {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  margin-bottom: 10px;
  background: #fafafa;
}

.summary-card p { margin: 0 0 6px; color: var(--muted); }
.summary-card strong { font-size: 24px; }
.summary-card.highlight { background: #fff7ed; border-color: var(--primary); }

.cash-box {
  border: 1px solid var(--border);
  background: #fafafa;
  border-radius: 14px;
  padding: 12px;
  margin-bottom: 12px;
}

.cash-box label {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 14px;
}

.cash-box input, .stock-item input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
  font-size: 15px;
}

.status-open {
  color: var(--success) !important;
  font-weight: 700;
}

.status-closed {
  color: var(--danger) !important;
  font-weight: 700;
}

.stock-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.stock-item {
  display: grid;
  grid-template-columns: 1fr 90px;
  gap: 10px;
  align-items: center;
  border: 1px solid var(--border);
  background: #fafafa;
  padding: 10px;
  border-radius: 12px;
}

.stock-item span {
  color: var(--text);
  font-size: 14px;
}

.stock-item.low-stock {
  background: #fff7ed;
  border-color: var(--primary);
}

.stock-actions { margin-top: 14px; }

footer {
  text-align: center;
  padding: 16px;
  color: var(--muted);
}

@media (max-width: 1300px) {
  .layout { grid-template-columns: 1fr 1.3fr; }
}

@media (max-width: 850px) {
  .layout { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .app-header { flex-direction: column; align-items: flex-start; }
  .tables-grid, .products-grid { grid-template-columns: 1fr; }
  .actions-row { grid-template-columns: 1fr; }
  .stock-item { grid-template-columns: 1fr; }
}