* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --success: #16a34a;
  --success-dark: #15803d;
  --danger: #dc2626;
  --danger-dark: #b91c1c;
  --secondary: #6b7280;
  --bg: #f3f4f6;
  --card: #ffffff;
  --text: #111827;
  --text-light: #6b7280;
  --border: #e5e7eb;
  --radius: 10px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100dvh;
  -webkit-tap-highlight-color: transparent;
}

/* ---- Login ---- */
.login-body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100dvh;
  background: linear-gradient(135deg, var(--primary), #7c3aed);
}

.login-container {
  background: var(--card);
  padding: 2rem;
  border-radius: var(--radius);
  width: 90%;
  max-width: 360px;
  text-align: center;
}

.login-container h1 {
  margin-bottom: 1.5rem;
  color: var(--primary);
  font-size: 1.5rem;
}

.login-container input {
  width: 100%;
  padding: 0.75rem;
  margin-bottom: 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
}

.error-text {
  color: var(--danger);
  font-size: 0.875rem;
  margin-top: 0.5rem;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.2rem;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
  touch-action: manipulation;
}

.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:active { background: var(--primary-dark); }
.btn-success { background: var(--success); color: #fff; }
.btn-success:active { background: var(--success-dark); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:active { background: var(--danger-dark); }
.btn-secondary { background: var(--secondary); color: #fff; }
.btn-block { display: block; width: 100%; }
.btn-icon {
  background: none;
  border: none;
  font-size: 1.8rem;
  cursor: pointer;
  padding: 0.5rem;
  line-height: 1;
  min-width: 44px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-small {
  padding: 0.35rem 0.6rem;
  font-size: 0.85rem;
}

/* ---- Header ---- */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background: var(--primary);
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 100;
}

.app-header h1 {
  font-size: 1.15rem;
  flex: 1;
  text-align: center;
}

.header-actions {
  display: flex;
  gap: 0.4rem;
}

.header-actions .btn-icon {
  color: #fff;
  filter: brightness(0) invert(1);
}

.btn-header {
  background: rgba(255,255,255,0.2);
  border: 1px solid rgba(255,255,255,0.4);
  border-radius: 6px;
  color: #fff;
  font-size: 1.3rem;
  padding: 0.4rem 0.55rem;
  cursor: pointer;
  line-height: 1;
}

/* ---- Category tabs ---- */
.category-tabs {
  display: flex;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 52px;
  z-index: 99;
}

.tab {
  flex: 1;
  padding: 0.75rem;
  background: none;
  border: none;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-light);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: all 0.15s;
}

.tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

/* ---- Items grid ---- */
.items-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.6rem;
  padding: 0.75rem;
  padding-bottom: 280px; /* space for order panel */
}

.item-btn {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.2rem 0.5rem;
  background: var(--card);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.1s;
  min-height: 100px;
  touch-action: manipulation;
}

.item-badge {
  position: absolute;
  top: 4px;
  right: 4px;
  background: var(--danger);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  min-width: 22px;
  height: 22px;
  line-height: 22px;
  text-align: center;
  border-radius: 6px;
  padding: 0 5px;
}

.item-btn.item-menu {
  border-color: var(--primary);
}

.item-btn:active {
  border-color: var(--primary);
  background: #eff6ff;
  transform: scale(0.97);
}

.item-btn .item-name {
  font-weight: 600;
  font-size: 1.05rem;
  text-align: center;
  word-break: break-word;
}

.item-btn .item-price {
  color: var(--primary);
  font-weight: 700;
  font-size: 1rem;
  margin-top: 0.2rem;
}

.item-btn .item-tag {
  font-size: 0.7rem;
  color: var(--text-light);
  background: var(--bg);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  margin-top: 0.2rem;
}

/* ---- Order panel ---- */
.order-panel {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--card);
  border-top: 2px solid var(--border);
  padding: 0.6rem 0.75rem;
  max-height: 50vh;
  overflow-y: auto;
  z-index: 100;
  box-shadow: 0 -2px 10px rgba(0,0,0,0.08);
}

.order-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.4rem;
}

.order-title {
  font-weight: 700;
  font-size: 1.05rem;
}

.order-total {
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--success);
}

.order-items {
  max-height: 140px;
  overflow-y: auto;
  margin-bottom: 0.5rem;
}

.order-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.3rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

.order-item-left {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.qty-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg);
  font-size: 1.2rem;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  touch-action: manipulation;
}

.order-item-price {
  font-weight: 600;
  white-space: nowrap;
}

.order-actions {
  display: flex;
  gap: 0.6rem;
}

.order-actions .btn {
  flex: 1;
}

.order-empty {
  text-align: center;
  color: var(--text-light);
  padding: 0.5rem 0;
  font-size: 0.9rem;
}

/* ---- Modal ---- */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 1rem;
}

.modal[hidden] { display: none; }

.modal-content {
  background: var(--card);
  border-radius: var(--radius);
  padding: 1.5rem;
  width: 100%;
  max-width: 400px;
  max-height: 85vh;
  overflow-y: auto;
}

.modal-large {
  max-width: 500px;
}

.modal-content h2 {
  margin-bottom: 1rem;
  font-size: 1.15rem;
}

.modal-total {
  font-size: 1.1rem;
  margin: 0.75rem 0;
  text-align: right;
}

.modal-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1rem;
}

.modal-actions .btn {
  flex: 1 1 calc(50% - 0.6rem);
  min-width: 0;
  white-space: nowrap;
}

.modal-summary-item {
  display: flex;
  justify-content: space-between;
  padding: 0.25rem 0;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border);
}

/* ---- History ---- */
.orders-list {
  padding: 0.75rem;
}

.history-summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  font-size: 1.1rem;
  position: sticky;
  top: 48px;
  z-index: 50;
}

.order-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 0.85rem;
  margin-bottom: 0.6rem;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: border-color 0.15s;
}

.order-card:active {
  border-color: var(--primary);
}

.order-card-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.3rem;
}

.order-card-id {
  font-weight: 700;
  color: var(--primary);
}

.order-card-total {
  font-weight: 700;
  color: var(--success);
}

.order-card-date {
  font-size: 0.8rem;
  color: var(--text-light);
}

.order-card-items {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-top: 0.3rem;
}

/* ---- Options ---- */
.options-section {
  padding: 0.75rem;
}

.options-list {
  margin-bottom: 0.75rem;
}

.option-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 0.75rem;
  margin-bottom: 0.5rem;
  border: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.option-info {
  flex: 1;
}

.option-info .option-name {
  font-weight: 600;
}

.option-info .option-details {
  font-size: 0.8rem;
  color: var(--text-light);
}

.option-actions {
  display: flex;
  gap: 0.4rem;
}

/* ---- Forms ---- */
.form-group {
  margin-bottom: 0.75rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.3rem;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 0.65rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
}

.checkboxes-list {
  max-height: 200px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.5rem;
}

.checkboxes-list label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0;
  font-weight: 400;
}

.checkboxes-list input[type="checkbox"] {
  width: 18px;
  height: 18px;
}

/* ---- Edit order items ---- */
.edit-items {
  max-height: 300px;
  overflow-y: auto;
}

.edit-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--border);
}

.edit-item-left {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* ---- Utility ---- */
.empty-state {
  text-align: center;
  color: var(--text-light);
  padding: 2rem 1rem;
}

/* Responsive: 3 columns on wider phones */
@media (min-width: 420px) {
  .items-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}