:root {
  --surface: #f7f9fb;
  --surface-bright: #f7f9fb;
  --surface-lowest: #ffffff;
  --surface-low: #f2f4f6;
  --surface-container: #eceef0;
  --surface-high: #e6e8ea;
  --surface-highest: #e0e3e5;
  --on-surface: #191c1e;
  --on-variant: #3c4a42;
  --outline: #6c7a71;
  --outline-variant: #bbcabf;
  --primary: #006c49;
  --primary-container: #10b981;
  --on-primary: #ffffff;
  --on-primary-container: #00422b;
  --secondary: #515f74;
  --secondary-container: #d5e3fd;
  --on-secondary-container: #57657b;
  --error: #ba1a1a;
  --error-container: #ffdad6;
  --on-error-container: #93000a;
  --shadow: 0 8px 24px rgba(15, 23, 42, .06);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--surface);
  color: var(--on-surface);
  font-family: Inter, system-ui, sans-serif;
}

button, input, select {
  font: inherit;
}

button {
  cursor: pointer;
  border: 0;
}

.material-symbols-outlined {
  font-variation-settings: "FILL" 1;
  line-height: 1;
}

.app-shell {
  min-height: 100vh;
  display: flex;
}

.side-nav {
  width: 280px;
  position: fixed;
  inset: 0 auto 0 0;
  background: var(--surface-lowest);
  border-right: 1px solid var(--outline-variant);
  padding: 16px;
  display: flex;
  flex-direction: column;
  z-index: 20;
}

.brand {
  display: flex;
  gap: 16px;
  align-items: center;
  margin-bottom: 32px;
}

.brand-icon {
  color: var(--primary);
  font-size: 32px;
}

.brand h1 {
  color: var(--primary);
  font-size: 24px;
  line-height: 32px;
  margin: 0;
  font-weight: 800;
}

.brand p {
  color: var(--on-variant);
  font-size: 12px;
  margin: 0;
}

.quick-sale, .primary-action, .primary-small {
  background: var(--primary);
  color: var(--on-primary);
  border-radius: 8px;
  min-height: 48px;
  padding: 0 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 700;
}

.quick-sale {
  background: var(--primary-container);
  color: var(--on-primary-container);
  margin-bottom: 24px;
  width: 100%;
}

.nav-links, .side-footer {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nav-links { flex: 1; }

.side-footer {
  border-top: 1px solid var(--outline-variant);
  padding-top: 16px;
}

.nav-link {
  width: 100%;
  min-height: 44px;
  border-radius: 12px;
  background: transparent;
  color: var(--on-variant);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px 16px;
  font-weight: 700;
  text-align: left;
}

.nav-link.active {
  background: var(--secondary-container);
  color: var(--on-secondary-container);
}

.nav-link.danger {
  color: var(--error);
}

.main-shell {
  margin-left: 280px;
  min-height: 100vh;
  width: calc(100% - 280px);
  display: flex;
  flex-direction: column;
}

.top-bar {
  height: 64px;
  background: var(--surface-bright);
  border-bottom: 1px solid var(--outline-variant);
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 10;
}

.top-metrics, .top-actions {
  display: flex;
  align-items: center;
  gap: 24px;
}

.top-metrics span {
  display: block;
  color: var(--on-variant);
  font-size: 12px;
  font-weight: 600;
}

.top-metrics strong {
  color: var(--primary);
  font-size: 20px;
  line-height: 28px;
}

.warning-metric {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--error);
}

.warning-metric strong, .warning-metric span {
  color: var(--error);
}

.icon-button {
  width: 44px;
  height: 44px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--on-variant);
}

.icon-button:hover {
  color: var(--primary);
  background: var(--surface-container);
}

.mobile-menu { display: none; }

main {
  flex: 1;
  padding: 32px;
  overflow: auto;
}

.view { display: none; }
.view.active { display: block; }

.pos-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 24px;
}

.pos-workspace {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.scan-panel, .toolbar, .cart-panel, .recent-sales, .table-card, .settings-panel {
  background: var(--surface-lowest);
  border: 1px solid var(--outline-variant);
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.scan-panel, .toolbar {
  padding: 16px;
  display: flex;
  gap: 16px;
  align-items: center;
}

.search-field {
  position: relative;
  flex: 1;
}

.search-field span {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--on-variant);
}

input, select {
  width: 100%;
  min-height: 48px;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  background: var(--surface-low);
  color: var(--on-surface);
  padding: 10px 12px;
}

.search-field input { padding-left: 44px; }

input:focus, select:focus {
  outline: 2px solid rgba(0, 108, 73, .18);
  border-color: var(--primary);
  background: var(--surface-bright);
}

.scanner-button {
  min-height: 48px;
  padding: 0 20px;
  border-radius: 8px;
  background: var(--primary);
  color: var(--on-primary);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
}

.product-suggestions {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 8px;
}

.suggestion {
  min-height: 60px;
  padding: 10px 12px;
  border: 1px solid var(--outline-variant);
  border-radius: 8px;
  background: var(--surface-lowest);
  text-align: left;
}

.suggestion strong, .suggestion span {
  display: block;
}

.suggestion span {
  color: var(--on-variant);
  font-size: 12px;
  margin-top: 3px;
}

.cart-panel {
  overflow: hidden;
}

.panel-header, .page-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.panel-header {
  background: var(--surface-low);
  border-bottom: 1px solid var(--outline-variant);
  padding: 16px;
}

.panel-header h2, .page-heading h2 {
  margin: 0;
  font-size: 24px;
  line-height: 32px;
}

.text-danger {
  background: transparent;
  color: var(--error);
  font-size: 12px;
  font-weight: 700;
}

.cart-list {
  min-height: 300px;
  max-height: calc(100vh - 370px);
  overflow: auto;
}

.cart-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 130px 110px 44px;
  gap: 12px;
  align-items: center;
  padding: 16px;
  border-bottom: 1px solid var(--surface-highest);
}

.cart-item:nth-child(even) {
  background: var(--surface-bright);
}

.cart-item h4 {
  margin: 0;
  font-size: 16px;
}

.cart-item p {
  margin: 3px 0 0;
  color: var(--on-variant);
  font-size: 12px;
}

.qty-control {
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--outline-variant);
  border-radius: 6px;
  overflow: hidden;
}

.qty-control button {
  width: 40px;
  height: 40px;
  background: var(--surface-lowest);
  color: var(--on-variant);
}

.qty-control span {
  width: 40px;
  text-align: center;
  font-weight: 700;
}

.money {
  text-align: right;
  font-weight: 800;
}

.delete-button {
  width: 36px;
  height: 36px;
  border-radius: 999px;
  background: transparent;
  color: var(--error);
}

.empty-state {
  padding: 56px 16px;
  text-align: center;
  color: var(--on-variant);
}

.checkout-panel {
  padding: 24px;
  background: var(--surface-low);
  border-top: 1px solid var(--outline-variant);
}

.total-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 16px;
  margin-bottom: 16px;
}

.total-row span {
  color: var(--on-variant);
  font-size: 24px;
  font-weight: 600;
}

.total-row strong {
  color: var(--primary);
  font-size: 48px;
  line-height: 56px;
  font-weight: 900;
}

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

.pay-button {
  min-height: 64px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 20px;
  font-weight: 800;
}

.pay-button.cash {
  background: var(--primary-container);
  color: var(--on-primary-container);
}

.pay-button.card {
  background: var(--primary);
  color: var(--on-primary);
}

.recent-sales {
  padding: 16px;
  height: calc(100vh - 128px);
  overflow: auto;
}

.recent-sales h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--outline-variant);
  font-size: 20px;
}

.sale-card {
  border: 1px solid var(--outline-variant);
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 10px;
  background: var(--surface-bright);
}

.sale-card div {
  display: flex;
  justify-content: space-between;
  gap: 10px;
}

.sale-card small {
  color: var(--on-variant);
  font-weight: 700;
}

.sale-card strong {
  color: var(--primary);
}

.page-heading {
  margin-bottom: 24px;
}

.page-heading h2 {
  font-size: 32px;
  line-height: 40px;
}

.toolbar {
  margin-bottom: 16px;
}

.toolbar select {
  max-width: 190px;
}

.table-card {
  overflow: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 820px;
}

th {
  background: var(--surface-container);
  color: var(--secondary);
  text-align: left;
  padding: 16px;
  font-size: 14px;
}

td {
  padding: 16px;
  border-top: 1px solid var(--surface-highest);
}

tbody tr:hover {
  background: var(--surface-bright);
}

.stock-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 700;
  background: var(--surface-container);
  color: var(--primary);
}

.stock-chip.low {
  background: var(--error-container);
  color: var(--on-error-container);
}

.row-actions {
  display: flex;
  justify-content: flex-end;
  gap: 6px;
}

.row-actions button {
  width: 36px;
  height: 36px;
  border-radius: 6px;
  background: transparent;
  color: var(--secondary);
}

.row-actions button:hover {
  background: var(--surface-container);
  color: var(--primary);
}

.row-actions .remove:hover {
  color: var(--error);
}

.report-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.metric-card {
  background: var(--surface-lowest);
  border: 1px solid var(--outline-variant);
  border-radius: 12px;
  padding: 20px;
}

.metric-card span {
  color: var(--on-variant);
  font-weight: 700;
}

.metric-card strong {
  display: block;
  margin-top: 12px;
  color: var(--primary);
  font-size: 32px;
}

.settings-panel {
  max-width: 560px;
  padding: 20px;
}

label {
  display: grid;
  gap: 6px;
  color: var(--on-variant);
  font-size: 14px;
  font-weight: 700;
}

dialog {
  width: min(560px, calc(100vw - 32px));
  border: 0;
  border-radius: 12px;
  box-shadow: 0 24px 80px rgba(15, 23, 42, .24);
}

dialog::backdrop {
  background: rgba(15, 23, 42, .35);
}

.product-form {
  display: grid;
  gap: 14px;
}

.dialog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.dialog-header h3 {
  margin: 0;
  font-size: 24px;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.toast {
  position: fixed;
  right: 20px;
  bottom: 20px;
  background: #2d3133;
  color: #eff1f3;
  border-radius: 8px;
  padding: 12px 16px;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: .18s ease;
  z-index: 40;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 960px) {
  .side-nav {
    transform: translateX(-100%);
    transition: transform .2s ease;
  }

  body.menu-open .side-nav {
    transform: translateX(0);
  }

  .main-shell {
    margin-left: 0;
    width: 100%;
  }

  .mobile-menu { display: inline-flex; }

  .top-bar {
    padding: 0 16px;
  }

  .top-metrics {
    gap: 12px;
  }

  .top-metrics > div:not(:first-child) {
    display: none;
  }

  .top-actions .icon-button, .primary-small {
    display: none;
  }

  main {
    padding: 16px;
  }

  .pos-grid {
    display: block;
  }

  .scan-panel, .toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .scanner-button {
    border: 2px dashed var(--outline-variant);
    background: var(--surface-high);
    color: var(--on-variant);
    min-height: 56px;
  }

  .recent-sales {
    margin-top: 16px;
    height: auto;
    max-height: 360px;
  }

  .cart-list {
    max-height: none;
  }

  .cart-item {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .money {
    text-align: left;
  }

  .total-row strong {
    font-size: 28px;
    line-height: 36px;
  }

  .total-row span {
    font-size: 18px;
  }

  .payment-grid, .report-grid, .form-grid {
    grid-template-columns: 1fr;
  }

  .pay-button {
    min-height: 64px;
    font-size: 16px;
  }

  .page-heading {
    align-items: flex-start;
    gap: 12px;
    flex-direction: column;
  }

  .toolbar select {
    max-width: none;
  }
}