* {
  box-sizing: border-box;
}

:root {
  --green: #15803d;
  --green-dark: #166534;
  --green-soft: #f0fdf4;
  --white: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #d1d5db;
  --danger: #dc2626;
  --shadow: 0 12px 30px rgba(22, 101, 52, 0.08);
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f7faf8;
  color: var(--text);
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

.topbar {
  background: linear-gradient(135deg, var(--green-dark), var(--green));
  color: var(--white);
  padding: 28px max(20px, calc((100% - 1180px) / 2));
}

.topbar h1 {
  margin: 0;
  font-size: clamp(1.6rem, 4vw, 2.35rem);
}

.topbar p {
  margin: 6px 0 0;
  opacity: 0.9;
}

.nav-tabs {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 12px max(16px, calc((100% - 1180px) / 2));
  background: var(--white);
  border-bottom: 1px solid var(--border);
}

.nav-btn {
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 10px 16px;
  border-radius: 10px;
  white-space: nowrap;
  font-weight: 700;
}

.nav-btn.active,
.nav-btn:hover {
  color: var(--white);
  background: var(--green);
}

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 28px 18px 50px;
}

.page {
  display: none;
}

.page.active {
  display: block;
}

.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
}

.section-heading h2,
.panel-title h3 {
  margin: 0;
}

.eyebrow {
  display: block;
  margin-bottom: 5px;
  color: var(--green);
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.stat-card,
.panel {
  background: var(--white);
  border: 1px solid #e5e7eb;
  border-radius: 16px;
  box-shadow: var(--shadow);
}

.stat-card {
  padding: 20px;
  border-top: 4px solid var(--green);
}

.stat-card span {
  color: var(--muted);
  font-size: 0.9rem;
}

.stat-card strong {
  display: block;
  margin-top: 9px;
  font-size: 1.65rem;
  color: var(--green-dark);
}

.panel {
  padding: 20px;
}

.panel-title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.primary-btn,
.secondary-btn {
  border: 0;
  border-radius: 10px;
  padding: 11px 16px;
  font-weight: 800;
}

.primary-btn {
  color: var(--white);
  background: var(--green);
}

.primary-btn:hover {
  background: var(--green-dark);
}

.secondary-btn {
  color: var(--text);
  background: #e5e7eb;
}

.full-btn {
  width: 100%;
}

.text-btn,
.icon-btn {
  border: 0;
  background: transparent;
}

.text-btn {
  color: var(--green);
  font-weight: 800;
}

.danger-text {
  color: var(--danger);
}

.icon-btn {
  font-size: 1.7rem;
  color: var(--muted);
}

.search-row {
  margin-bottom: 16px;
}

input,
select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 11px 12px;
  background: var(--white);
  color: var(--text);
  outline: none;
}

input:focus,
select:focus {
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(21, 128, 61, 0.12);
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  padding: 13px 12px;
  border-bottom: 1px solid #e5e7eb;
  text-align: left;
  white-space: nowrap;
}

th {
  color: var(--green-dark);
  background: var(--green-soft);
}

.actions-col {
  text-align: right;
}

.action-cell {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.small-btn {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 7px 10px;
  background: var(--white);
  font-weight: 700;
}

.small-btn.edit {
  color: var(--green);
}

.small-btn.delete {
  color: var(--danger);
}

.empty-state {
  padding: 28px 10px;
  text-align: center;
  color: var(--muted);
}

.cashier-layout {
  display: grid;
  grid-template-columns: 1.6fr 0.9fr;
  gap: 18px;
  align-items: start;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.product-card {
  text-align: left;
  border: 1px solid #dbe7de;
  background: var(--white);
  border-radius: 13px;
  padding: 15px;
  transition: 0.15s ease;
}

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

.product-card:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.product-card h4 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.product-card strong {
  display: block;
  color: var(--green-dark);
}

.product-card span {
  display: block;
  margin-top: 5px;
  color: var(--muted);
  font-size: 0.85rem;
}

.cart-panel {
  position: sticky;
  top: 78px;
}

.cart-items {
  display: grid;
  gap: 12px;
  max-height: 420px;
  overflow-y: auto;
}

.cart-item {
  padding-bottom: 12px;
  border-bottom: 1px solid #e5e7eb;
}

.cart-item-head {
  display: flex;
  justify-content: space-between;
  gap: 10px;
}

.cart-item-head h4 {
  margin: 0;
}

.cart-item-head span {
  color: var(--green-dark);
  font-weight: 800;
}

.qty-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
}

.qty-btn {
  width: 30px;
  height: 30px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--white);
  font-weight: 800;
}

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

.cart-total {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 18px 0;
  padding-top: 16px;
  border-top: 2px solid var(--green);
}

.cart-total strong {
  font-size: 1.35rem;
  color: var(--green-dark);
}

.toolbar {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 18px;
}

.filter-group {
  display: grid;
  grid-template-columns: 180px minmax(220px, 1fr);
  gap: 10px;
  flex: 1;
}

.summary-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}

.summary-strip div {
  padding: 14px;
  border-radius: 12px;
  background: var(--green-soft);
}

.summary-strip span {
  display: block;
  color: var(--muted);
  font-size: 0.86rem;
}

.summary-strip strong {
  display: block;
  margin-top: 4px;
  color: var(--green-dark);
  font-size: 1.2rem;
}

.history-list {
  display: grid;
  gap: 12px;
}

.history-card {
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 15px;
}

.history-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.history-head strong {
  color: var(--green-dark);
}

.history-head small {
  color: var(--muted);
}

.history-items {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
}

.history-total {
  margin-top: 10px;
  text-align: right;
  font-weight: 800;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(15, 23, 42, 0.52);
}

.hidden {
  display: none !important;
}

.modal-card {
  width: min(100%, 460px);
  background: var(--white);
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 22px 60px rgba(0, 0, 0, 0.2);
}

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

.modal-header h3 {
  margin: 0;
}

form {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

label {
  display: grid;
  gap: 7px;
  font-weight: 700;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 4px;
}

.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 200;
  max-width: min(360px, calc(100% - 36px));
  padding: 13px 16px;
  border-radius: 10px;
  background: var(--green-dark);
  color: var(--white);
  box-shadow: var(--shadow);
}

@media (max-width: 900px) {
  .stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .cashier-layout {
    grid-template-columns: 1fr;
  }

  .cart-panel {
    position: static;
  }
}

@media (max-width: 640px) {
  .container {
    padding: 20px 12px 40px;
  }

  .section-heading,
  .toolbar {
    align-items: stretch;
    flex-direction: column;
  }

  .stats-grid,
  .summary-strip,
  .product-grid {
    grid-template-columns: 1fr;
  }

  .filter-group {
    grid-template-columns: 1fr;
  }

  .panel {
    padding: 15px;
  }

  .topbar {
    padding: 22px 16px;
  }

  .modal-actions {
    flex-direction: column-reverse;
  }

  .modal-actions button {
    width: 100%;
  }
}


.login-screen {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 20px;
  background:
    radial-gradient(circle at top left, rgba(21, 128, 61, 0.18), transparent 38%),
    #f7faf8;
}

.login-card {
  width: min(100%, 420px);
  padding: 30px;
  border: 1px solid #dbe7de;
  border-radius: 20px;
  background: #fff;
  box-shadow: 0 20px 50px rgba(22, 101, 52, 0.12);
}

.login-card h1 {
  margin: 12px 0 4px;
  color: var(--green-dark);
}

.login-card > p {
  margin: 0 0 22px;
  color: var(--muted);
}

.login-brand {
  display: grid;
  width: 58px;
  height: 58px;
  place-items: center;
  border-radius: 16px;
  background: var(--green);
  color: white;
  font-weight: 900;
  letter-spacing: .08em;
}

.login-error {
  min-height: 20px;
  margin: 0;
  color: var(--danger);
  font-size: .9rem;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.logout-btn {
  border: 1px solid rgba(255,255,255,.55);
  border-radius: 10px;
  padding: 10px 14px;
  background: rgba(255,255,255,.12);
  color: white;
  font-weight: 800;
}

.logout-btn:hover {
  background: white;
  color: var(--green-dark);
}