:root {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-sidebar: #0f172a;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-light: #cbd5e1;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #10b981;
  --success-hover: #059669;
  --danger: #ef4444;
  --border: #e2e8f0;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --radius: 12px;
  --radius-sm: 8px;
}

.pos-layout {
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 1.5rem;
  height: calc(100vh - 2rem);
  padding: 1rem;
  background: var(--bg-primary);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  box-sizing: border-box;
}

/* Catalog Section */
.pos-catalog {
  background: var(--bg-secondary);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.catalog-header {
  padding: 1.25rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
}

.search-wrapper {
  position: relative;
  margin-bottom: 1rem;
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  color: var(--text-secondary);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 12px 14px 12px 44px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  background: #f1f5f9;
  transition: all 0.2s;
  box-sizing: border-box;
}

.search-input:focus {
  outline: none;
  border-color: var(--accent);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.category-tabs {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: none;
}

.category-tabs::-webkit-scrollbar { display: none; }

.tab {
  padding: 8px 16px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-weight: 500;
  border-radius: 20px;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s;
}

.tab:hover { background: #f1f5f9; }
.tab.active { background: var(--accent); color: white; }

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 1rem;
  padding: 1.25rem;
  overflow-y: auto;
  flex: 1;
}

.product-card {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  user-select: none;
}

.product-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: var(--accent);
}

.product-image {
  font-size: 2.5rem;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.product-name {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-primary);
  font-weight: 600;
}

.product-price {
  font-size: 0.9rem;
  color: var(--accent);
  font-weight: 700;
}

/* Cart Section */
.pos-cart {
  background: var(--bg-sidebar);
  color: #fff;
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow);
}

.cart-header {
  padding: 1.25rem;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.cart-header h2 { margin: 0; font-size: 1.25rem; }
.cart-meta { font-size: 0.85rem; color: var(--text-light); display: block; margin-top: 4px; }

.cart-controls { display: flex; gap: 0.5rem; }
.btn-icon {
  background: rgba(255,255,255,0.1);
  border: none;
  color: #fff;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1rem;
  transition: background 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.btn-icon:hover { background: rgba(255,255,255,0.2); }

.cart-items-container {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
}

.cart-item {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 1rem;
  align-items: center;
  padding: 0.75rem;
  background: rgba(255,255,255,0.05);
  border-radius: var(--radius-sm);
  margin-bottom: 0.5rem;
}

.cart-item-info h4 { margin: 0 0 4px; font-size: 0.95rem; }
.item-price { font-size: 0.8rem; color: var(--text-light); }

.qty-control {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(0,0,0,0.2);
  padding: 4px;
  border-radius: 6px;
}

.qty-btn {
  background: transparent;
  border: none;
  color: #fff;
  width: 28px;
  height: 28px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}
.qty-btn:hover { background: rgba(255,255,255,0.1); }
.qty-value { font-weight: 600; min-width: 20px; text-align: center; }

.item-total { font-weight: 700; color: #fff; }

.cart-summary {
  padding: 1.25rem;
  background: rgba(0,0,0,0.2);
  border-top: 1px solid rgba(255,255,255,0.1);
}

.summary-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-light);
}

.summary-row.discount { color: var(--success); }
.summary-row.total {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-top: 0.5rem;
  padding-top: 0.5rem;
  border-top: 1px dashed rgba(255,255,255,0.2);
}

.total-amount { color: var(--success); }

.payment-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  margin: 1rem 0;
}

.payment-btn {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.1);
  color: #fff;
  padding: 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.2s;
}

.payment-btn:hover { background: rgba(255,255,255,0.15); }
.payment-btn.active { background: var(--accent); border-color: var(--accent); }

.checkout-btn {
  width: 100%;
  padding: 14px;
  background: var(--success);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.checkout-btn:hover { background: var(--success-hover); transform: translateY(-1px); }

/* Responsive */
@media (max-width: 900px) {
  .pos-layout {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr auto;
    height: auto;
    padding: 0.5rem;
  }
  .pos-cart {
    max-height: 500px;
  }
  .product-grid {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  }
}

@keyframes slideIn { from { transform: translateY(20px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }

/* Scrollbar styling */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #94a3b8; }
.pos-cart ::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.2); }