/*
 * MARUTI POS — CHECKOUT PAGE — Professional Responsive v4.0
 * Designed with mobile-first principles, professional grid breakpoints,
 * and clean component-level separation.
 *
 * Breakpoints:
 *   Mobile:  < 640px   → single column, fixed bottom action bar
 *   Tablet:  640–1023px → two column (60/40 split)
 *   Desktop: ≥ 1024px  → two column (wider left, sticky right)
 */

/* ── Design Tokens ──────────────────────────────────────────────────────── */
:root {
  --brand:        #ff6f61;
  --brand-dark:   #e05a50;
  --brand-glow:   rgba(255, 111, 97, 0.20);
  --brand-light:  #fff5f4;
  --brand-mid:    rgba(255, 111, 97, 0.10);

  --surface:      #ffffff;
  --bg:           #f0f4f8;
  --bg-card:      #f8fafc;
  --border:       #e2e8f0;
  --border-md:    #cbd5e1;

  --text-1: #0f172a;
  --text-2: #475569;
  --text-3: #94a3b8;

  --green:  #10b981;
  --red:    #ef4444;
  --blue:   #3b82f6;
  --amber:  #f59e0b;

  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 14px;
  --r-xl: 18px;
  --r-2xl: 24px;

  --sh-xs: 0 1px 3px rgba(0,0,0,0.07);
  --sh-sm: 0 2px 10px rgba(0,0,0,0.08);
  --sh-md: 0 4px 24px rgba(0,0,0,0.10);
  --sh-brand: 0 6px 20px var(--brand-glow);

  --header-h: 56px;
  --bar-h: 76px; /* mobile bottom bar */
}

/* ── Reset ───────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Poppins', 'Inter', -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text-1);
  -webkit-font-smoothing: antialiased;
  min-height: 100dvh;
}

/* ── Notification ────────────────────────────────────────────────────────── */
.notification {
  position: fixed;
  top: calc(var(--header-h) + 10px);
  left: 50%;
  transform: translateX(-50%) translateY(-12px);
  background: var(--text-1);
  color: #fff;
  padding: 9px 20px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  box-shadow: var(--sh-md);
  opacity: 0;
  z-index: 9999;
  transition: all 0.3s cubic-bezier(0.34,1.2,0.64,1);
  pointer-events: none;
  max-width: 90vw;
  text-align: center;
  white-space: normal;
}
.notification.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.notification.success { background: var(--green); }
.notification.error   { background: var(--red); }

/* ═══════════════════════════════════════════════════════════════════════════
   ❶  HEADER — Sticky, frosted glass
   ═══════════════════════════════════════════════════════════════════════════ */
.pos-header {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 0 var(--border);
}

.header-left .back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-2);
  text-decoration: none;
  padding: 6px 13px;
  border: 1.5px solid var(--border);
  border-radius: 999px;
  background: var(--bg-card);
  transition: all 0.2s;
  white-space: nowrap;
}
.header-left .back-link:hover {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
  text-decoration: none;
}

.header-center .logo {
  font-size: 1rem;
  font-weight: 900;
  color: var(--brand);
  letter-spacing: -0.02em;
}

.header-right .user-profile {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-2);
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: 999px;
  padding: 5px 12px 5px 8px;
  white-space: nowrap;
}
.user-profile i { font-size: 1rem; color: var(--brand); }

/* ═══════════════════════════════════════════════════════════════════════════
   ❷  MAIN GRID LAYOUT
   ═══════════════════════════════════════════════════════════════════════════

   Mobile  (<640px):  1 column, bottom-bar for Place Order
   Tablet  (640-1023): 2 columns 58% / 42%
   Desktop (≥1024px): 2 columns 1fr / 420px
   Wide    (≥1440px): 2 columns 1fr / 460px, bigger padding
   ═══════════════════════════════════════════════════════════════════════════ */

.checkout-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  padding: 14px 12px;
  /* Clear: bottom-nav (~64px) + placement-area (~70px) + safe-area */
  padding-bottom: calc(144px + env(safe-area-inset-bottom));
  max-width: 1440px;
  margin: 0 auto;
  width: 100%;
}

/* ── Tablet: ≥ 640px ─────────────────────────────────────────── */
@media (min-width: 640px) {
  .checkout-container {
    grid-template-columns: 58fr 42fr;
    align-items: start;
    padding: 20px 20px;
    padding-bottom: 20px; /* no bottom bar on tablet+ */
    gap: 16px;
  }
}

/* ── Desktop: ≥ 1024px ───────────────────────────────────────── */
@media (min-width: 1024px) {
  .checkout-container {
    grid-template-columns: 1fr 420px;
    padding: 28px 28px;
    gap: 22px;
  }
}

/* ── Wide: ≥ 1440px ──────────────────────────────────────────── */
@media (min-width: 1440px) {
  .checkout-container {
    grid-template-columns: 1fr 460px;
    padding: 36px 40px;
    gap: 28px;
  }
}

/* ═══════════════════════════════════════════════════════════════════════════
   ❸  PANEL CARDS — shared shell
   ═══════════════════════════════════════════════════════════════════════════ */
.panel-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  box-shadow: var(--sh-sm);
  overflow: hidden;
}

/* ── Order Summary: left panel ───────────────────────────────── */
.order-details-panel {
  display: flex;
  flex-direction: column;
}

.order-details-panel .panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(135deg, #fff 60%, var(--brand-light));
  flex-shrink: 0;
}

.panel-header h2 {
  font-size: 0.88rem;
  font-weight: 800;
  color: var(--text-1);
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
}
.panel-header h2::before {
  content: '';
  display: inline-block;
  width: 3px; height: 16px;
  background: linear-gradient(to bottom, var(--brand), #ff9a5c);
  border-radius: 999px;
  flex-shrink: 0;
}
.panel-header h2 i { font-size: 0.82rem; color: var(--brand); }

#cart-count {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-2);
  background: var(--bg);
  padding: 2px 9px;
  border-radius: 999px;
  border: 1px solid var(--border);
}

/* ── Actions Panel: right panel ──────────────────────────────── */
.actions-panel {
  display: flex;
  flex-direction: column;
}

/* On tablet+, actions panel sticks to top as you scroll */
@media (min-width: 640px) {
  .actions-panel {
    position: sticky;
    top: calc(var(--header-h) + 12px);
    max-height: calc(100dvh - var(--header-h) - 24px);
    overflow-y: auto;
    scrollbar-width: none;
  }
  .actions-panel::-webkit-scrollbar { display: none; }
}

/* Actions panel header */
.actions-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(135deg, #fff 60%, var(--brand-light));
  flex-shrink: 0;
}
.actions-panel-header h2 {
  font-size: 0.88rem;
  font-weight: 800;
  color: var(--text-1);
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
}
.actions-panel-header h2::before {
  content: '';
  display: inline-block;
  width: 3px; height: 16px;
  background: linear-gradient(to bottom, var(--brand), #ff9a5c);
  border-radius: 999px;
  flex-shrink: 0;
}

.panel-body { padding: 16px; }

.panel-section {
  padding-bottom: 16px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border);
}
.panel-section:last-of-type {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: none;
}
.panel-section > h3 {
  font-size: 0.66rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-3);
  margin-bottom: 10px;
}

/* ═══════════════════════════════════════════════════════════════════════════
   ❹  CART ITEMS LIST
   ═══════════════════════════════════════════════════════════════════════════ */
.cart-items-list {
  padding: 12px;
  background: var(--bg-card);
  flex: 1; /* stretch to fill panel height */
}

/* On desktop, cap height and add scroll */
@media (min-width: 1024px) {
  .cart-items-list {
    max-height: 55vh;
    min-height: 200px;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
  }
  .cart-items-list::-webkit-scrollbar { width: 4px; }
  .cart-items-list::-webkit-scrollbar-thumb { background: var(--border); border-radius: 999px; }
}

/* ── Cart Item Row ────────────────────────────────────────────── */
.cart-item {
  display: grid;
  grid-template-columns: 56px 1fr auto;
  gap: 12px;
  align-items: center;
  padding: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  margin-bottom: 8px;
  transition: box-shadow 0.2s, border-color 0.2s, transform 0.15s;
}
.cart-item:last-child { margin-bottom: 0; }
.cart-item:hover {
  box-shadow: var(--sh-sm);
  border-color: rgba(255,111,97,0.28);
  transform: translateY(-1px);
}

.cart-item img {
  width: 56px; height: 56px;
  object-fit: contain;
  border-radius: var(--r-md);
  background: var(--bg);
  padding: 6px;
  flex-shrink: 0;
}

/* Fallback when no image */
.cart-item img[src=""],
.cart-item img:not([src]),
.cart-item img[src*="placeholder"] {
  content: '';
  background: linear-gradient(135deg, var(--bg), var(--border));
}

.item-info { min-width: 0; }

.item-info h3 {
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--text-1);
  margin: 0 0 2px;
  line-height: 1.3;
  /* Single line on mobile, wrap on bigger screens */
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

@media (min-width: 640px) {
  .item-info h3 {
    white-space: normal;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
  }
}

.item-info .item-price-meta {
  font-size: 0.72rem;
  color: var(--text-3);
  font-weight: 500;
  margin-bottom: 6px;
}

.item-controls {
  display: inline-flex;
  align-items: center;
  border: 1.5px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
  background: var(--bg);
}
.item-controls .qty-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  width: 26px; height: 26px;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.78rem;
  color: var(--text-2);
  transition: background 0.15s, color 0.15s;
}
.item-controls .qty-btn:hover { background: var(--brand); color: #fff; }
.item-controls .quantity {
  font-weight: 700;
  font-size: 0.82rem;
  min-width: 26px;
  text-align: center;
  color: var(--text-1);
}

.item-total {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 6px;
  flex-shrink: 0;
}
.item-total-price {
  font-weight: 800;
  font-size: 0.9rem;
  color: var(--text-1);
  white-space: nowrap;
}
.delete-btn {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: var(--red);
  font-size: 0.75rem;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: all 0.15s;
}
.delete-btn:hover { background: var(--red); color: #fff; transform: scale(1.1); }

/* ── Empty Cart ───────────────────────────────────────────────── */
.empty-cart-placeholder {
  padding: 40px 20px;
  text-align: center;
  color: var(--text-3);
}
.empty-cart-placeholder i { font-size: 2.8rem; margin-bottom: 10px; display: block; color: #cbd5e1; }
.empty-cart-placeholder p { font-size: 0.82rem; }

/* ═══════════════════════════════════════════════════════════════════════════
   ❺  CUSTOMER SECTION
   ═══════════════════════════════════════════════════════════════════════════ */
#customer-selection { position: relative; }

.customer-search-wrapper {
  display: flex;
  align-items: center;
  gap: 7px;
  position: relative;
}
.customer-search-wrapper > i {
  position: absolute;
  left: 11px;
  color: var(--text-3);
  pointer-events: none;
  font-size: 0.78rem;
}

#customer-search {
  flex: 1;
  min-width: 0;
  padding: 10px 12px 10px 32px;
  border: 1.5px solid var(--border);
  border-radius: var(--r-lg);
  font-family: inherit;
  font-size: 0.82rem;
  outline: none;
  background: var(--bg-card);
  transition: border-color 0.2s, box-shadow 0.2s;
  color: var(--text-1);
}
#customer-search::placeholder { color: var(--text-3); font-size: 0.8rem; }
#customer-search:focus {
  border-color: var(--brand);
  background: #fff;
  box-shadow: 0 0 0 3px var(--brand-glow);
}

.add-btn {
  width: 40px; height: 40px;
  border: 1.5px solid var(--border);
  border-radius: var(--r-md);
  background: #fff;
  color: var(--brand);
  font-size: 1rem;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: all 0.2s;
}
.add-btn:hover { background: var(--brand); color: #fff; border-color: var(--brand); transform: translateY(-1px); box-shadow: var(--sh-brand); }

/* Search Results Dropdown */
.search-results {
  position: absolute;
  top: calc(100% + 5px);
  left: 0; right: 0;
  z-index: 200;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-md);
  max-height: 220px;
  overflow-y: auto;
  animation: dd-open 0.12s ease-out;
}
@keyframes dd-open {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}
.result-item {
  display: flex; align-items: center; gap: 9px;
  padding: 10px 13px;
  cursor: pointer;
  font-size: 0.8rem;
  border-bottom: 1px solid var(--border);
  transition: background 0.1s;
}
.result-item:last-child { border-bottom: none; }
.result-item::before {
  content: '\f007';
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
  color: var(--text-3);
  font-size: 0.75rem;
  flex-shrink: 0;
}
.result-item:hover { background: var(--brand-mid); }
.result-item.muted { color: var(--text-3); cursor: default; }

/* Selected Customer Chip */
.selected-customer-display {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #f0fdf4;
  border: 1.5px solid #bbf7d0;
  padding: 9px 12px;
  border-radius: var(--r-lg);
  margin-top: 8px;
  gap: 8px;
  flex-wrap: wrap;
}
.customer-info { display: flex; align-items: center; gap: 7px; min-width: 0; }
.customer-info i { font-size: 1rem; color: var(--green); flex-shrink: 0; }
#customer-name-display { font-weight: 700; font-size: 0.83rem; color: var(--text-1); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

#verify-identity-btn {
  background: var(--green); color: #fff;
  border: none; padding: 5px 10px;
  border-radius: var(--r-sm);
  cursor: pointer; font-size: 0.75rem; font-weight: 700;
  transition: filter 0.15s;
  font-family: inherit;
}
#view-profile-btn {
  background: var(--blue); color: #fff;
  border: none; padding: 5px 10px;
  border-radius: var(--r-sm);
  cursor: pointer; font-size: 0.75rem; font-weight: 700;
  transition: filter 0.15s;
  font-family: inherit;
}
#change-customer-btn {
  background: var(--bg); color: var(--text-2);
  border: 1.5px solid var(--border); padding: 5px 10px;
  border-radius: var(--r-sm);
  cursor: pointer; font-size: 0.75rem; font-weight: 700;
  transition: background 0.15s;
  font-family: inherit;
}
#verify-identity-btn:hover  { filter: brightness(1.1); }
#view-profile-btn:hover     { filter: brightness(1.1); }
#change-customer-btn:hover  { background: var(--border); }

/* ═══════════════════════════════════════════════════════════════════════════
   ❻  PRICE DETAILS
   ═══════════════════════════════════════════════════════════════════════════ */
.price-details {
  border-radius: var(--r-md);
  border: 1px solid var(--border);
  overflow: hidden;
}

.price-details .summary-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  font-size: 0.8rem;
  color: var(--text-2);
  border-bottom: 1px solid var(--border);
  background: var(--bg-card);
}
.price-details .summary-row:nth-child(even) { background: #fff; }
.price-details .summary-row:last-child { border-bottom: none; }
.price-details .summary-row label { color: var(--text-2); font-size: 0.8rem; }
.price-details .summary-row.muted { color: var(--text-3); font-size: 0.75rem; }

.price-details .summary-row input {
  max-width: 78px;
  padding: 4px 9px;
  border-radius: var(--r-sm);
  border: 1.5px solid var(--border);
  font-family: inherit;
  font-size: 0.8rem;
  text-align: right;
  outline: none;
  background: #fff;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.price-details .summary-row input:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 2px var(--brand-glow);
}

/* Grand Total row */
.price-details .total {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 14px;
  background: linear-gradient(135deg, var(--brand), #ff9a5c);
  border-bottom: none;
}
.price-details .total strong {
  font-weight: 900;
  font-size: 1.1rem;
  color: #fff;
  letter-spacing: -0.02em;
}

/* ═══════════════════════════════════════════════════════════════════════════
   ❼  PAYMENT BUTTONS
   ═══════════════════════════════════════════════════════════════════════════ */
.payment-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.payment-options .payment-btn:nth-child(3) {
  grid-column: 1 / -1;
}

.payment-btn {
  padding: 11px 12px;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--r-lg);
  cursor: pointer;
  font-family: inherit;
  font-weight: 700;
  font-size: 0.78rem;
  display: flex;
  align-items: center;
  gap: 7px;
  color: var(--text-2);
  transition: all 0.18s;
}
.payment-btn i { font-size: 0.95rem; color: var(--text-3); width: 18px; text-align: center; transition: color 0.15s; }
.payment-btn:hover { border-color: rgba(255,111,97,0.35); color: var(--text-1); transform: translateY(-1px); box-shadow: var(--sh-xs); }
.payment-btn.active { background: var(--brand-light); border-color: var(--brand); color: var(--brand-dark); box-shadow: 0 3px 12px var(--brand-glow); }
.payment-btn.active i { color: var(--brand); }

/* Tender Breakdown */
.tender-breakdown { display: flex; flex-direction: column; gap: 7px; margin-top: 10px; }

.remaining-due-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1.5px dashed var(--border);
  font-weight: 700;
  font-size: 0.82rem;
  color: var(--text-1);
}
#remaining-due { color: var(--red); font-size: 0.98rem; }

/* ═══════════════════════════════════════════════════════════════════════════
   ❽  PLACE ORDER — TWO BEHAVIOURS
   Mobile  (<640px): fixed bottom bar (always visible)
   Tablet+ (≥640px): normal button inside panel
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Tablet+ desktop: normal placement inside panel ───────────── */
.placement-area { margin-top: 14px; }

.place-order-button {
  width: 100%;
  padding: 14px;
  font-size: 0.92rem;
  font-family: inherit;
  font-weight: 900;
  letter-spacing: 0.06em;
  background: linear-gradient(135deg, var(--brand), #ff9a5c);
  color: #fff;
  border: none;
  border-radius: var(--r-lg);
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  min-height: 50px;
  box-shadow: var(--sh-brand);
}
.place-order-button:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px var(--brand-glow);
}
.place-order-button:active:not(:disabled) { transform: translateY(0); }
.place-order-button:disabled {
  background: linear-gradient(135deg, #cbd5e1, #94a3b8);
  color: #fff;
  box-shadow: none;
  cursor: not-allowed;
  opacity: 0.75;
}

.credit-warning {
  text-align: center;
  color: var(--red);
  font-size: 0.72rem;
  margin-top: 7px;
  font-weight: 600;
}

/* ── Mobile (<640px): fixed bottom bar ───────────────────────── */
@media (max-width: 639px) {
  .placement-area {
    position: fixed;
    /* Sits directly above the bottom-nav (~64px tall) */
    bottom: calc(64px + env(safe-area-inset-bottom));
    left: 0; right: 0;
    z-index: 90; /* Below bottom-nav (z-index: 999) but above content */
    margin: 0;
    padding: 10px 14px;
    background: rgba(255,255,255,0.97);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-top: 1px solid var(--border);
    box-shadow: 0 -4px 20px rgba(0,0,0,0.10);
    display: flex;
    align-items: center;
    gap: 12px;
  }

  .placement-area .place-order-button {
    flex: 1;
    padding: 13px;
    font-size: 0.88rem;
    min-height: 48px;
    border-radius: var(--r-lg);
  }

  .credit-warning {
    position: absolute;
    top: -28px;
    left: 50%;
    transform: translateX(-50%);
    white-space: nowrap;
    background: rgba(239,68,68,0.1);
    padding: 2px 10px;
    border-radius: 999px;
    font-size: 0.68rem;
  }
}

/* ── Mobile total chip (only in bottom bar) ──────────────────── */
.mobile-total-display {
  display: none; /* hidden on tablet+ */
}

@media (max-width: 639px) {
  .mobile-total-display {
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    line-height: 1.2;
  }
  .mobile-total-display .label {
    font-size: 0.6rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-3);
  }
  .mobile-total-display .amount {
    font-size: 1.1rem;
    font-weight: 900;
    color: var(--text-1);
    letter-spacing: -0.02em;
  }
}

/* ═══════════════════════════════════════════════════════════════════════════
   ❾  SPINNER
   ═══════════════════════════════════════════════════════════════════════════ */
.spinner-container {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: inherit;
  border-radius: inherit;
}
.spinner {
  border: 3px solid rgba(255,255,255,0.3);
  border-left-color: #fff;
  border-radius: 50%;
  width: 20px; height: 20px;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ═══════════════════════════════════════════════════════════════════════════
   ❿  MODALS
   Bottom-sheet on mobile (<640px), centered card on tablet+
   ═══════════════════════════════════════════════════════════════════════════ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  z-index: 1000;
  animation: bd-in 0.2s ease;

  /* Mobile: sheet from bottom */
  align-items: flex-end;
  justify-content: stretch;
}
@keyframes bd-in { from { opacity: 0; } to { opacity: 1; } }

/* Mobile bottom sheet */
.modal-content {
  background: #fff;
  padding: 12px 18px 24px;
  border-radius: var(--r-2xl) var(--r-2xl) 0 0;
  width: 100%;
  max-height: 90dvh;
  overflow-y: auto;
  box-shadow: 0 -6px 40px rgba(0,0,0,0.18);
  animation: sheet-up 0.28s cubic-bezier(0.34,1.2,0.64,1);
}
@keyframes sheet-up {
  from { transform: translateY(40px); opacity: 0; }
  to   { transform: translateY(0); opacity: 1; }
}

/* Sheet grab handle */
.modal-content::before {
  content: '';
  display: block;
  width: 36px; height: 4px;
  background: var(--border-md);
  border-radius: 999px;
  margin: 0 auto 14px;
}

/* Tablet+: centered card */
@media (min-width: 640px) {
  .modal-overlay {
    align-items: center;
    justify-content: center;
    padding: 20px;
  }
  .modal-content {
    border-radius: var(--r-xl);
    max-width: 460px;
    padding: 24px;
    animation: card-up 0.24s cubic-bezier(0.34,1.2,0.64,1);
    box-shadow: var(--sh-md);
  }
  .modal-content::before { display: none; }
}
@keyframes card-up {
  from { transform: translateY(14px); opacity: 0; }
  to   { transform: translateY(0); opacity: 1; }
}

/* Modal Header */
.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.modal-header h3 {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--text-1);
  margin: 0;
  display: flex;
  align-items: center;
  gap: 7px;
}
.close-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  width: 30px; height: 30px;
  border-radius: 50%;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  color: var(--text-2);
  transition: all 0.15s;
  flex-shrink: 0;
}
.close-btn:hover { background: var(--red); color: #fff; border-color: var(--red); }

/* ── Add Customer Form ────────────────────────────────────────── */
#add-customer-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
#add-customer-form label {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-3);
  margin-bottom: -5px;
}
#add-customer-form input {
  padding: 10px 13px;
  border: 1.5px solid var(--border);
  border-radius: var(--r-md);
  font-family: inherit;
  font-size: 0.85rem;
  outline: none;
  background: var(--bg-card);
  color: var(--text-1);
  transition: border-color 0.2s, box-shadow 0.2s;
}
#add-customer-form input:focus {
  border-color: var(--brand);
  background: #fff;
  box-shadow: 0 0 0 3px var(--brand-glow);
}
#add-customer-form input::placeholder { color: var(--text-3); font-size: 0.8rem; }

.btn-primary {
  width: 100%;
  padding: 12px;
  background: linear-gradient(135deg, var(--brand), #ff9a5c);
  color: #fff;
  border: none;
  border-radius: var(--r-lg);
  font-family: inherit;
  font-weight: 800;
  font-size: 0.88rem;
  cursor: pointer;
  position: relative;
  min-height: 46px;
  box-shadow: var(--sh-brand);
  transition: all 0.2s;
}
.btn-primary:hover:not(:disabled) { transform: translateY(-1px); box-shadow: 0 8px 24px var(--brand-glow); }

/* ── Confirmation Modal ───────────────────────────────────────── */
.modal-content.confirmation { text-align: center; }
#confirmation-icon { font-size: 3.2rem; color: var(--green); margin-bottom: 12px; display: block; }
#confirmation-title { font-size: 1.3rem; font-weight: 900; margin-bottom: 6px; }
#confirmation-message { color: var(--text-2); margin-bottom: 20px; font-size: 0.85rem; }
#confirmation-ok-btn {
  width: 100%;
  padding: 13px;
  background: linear-gradient(135deg, var(--green), #059669);
  color: #fff; border: none;
  border-radius: var(--r-lg);
  font-family: inherit;
  font-weight: 800; font-size: 0.88rem;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(16,185,129,0.3);
  transition: all 0.2s;
}
#confirmation-ok-btn:hover { transform: translateY(-1px); }

/* ── OTP Inputs ───────────────────────────────────────────────── */
#udhar-otp-input,
#add-customer-otp-input {
  font-size: 1.7rem;
  text-align: center;
  letter-spacing: 12px;
  padding: 12px;
  width: 68%;
  margin: 0 auto 14px;
  display: block;
  border-radius: var(--r-lg);
  border: 2px solid var(--border);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  font-family: inherit;
  font-weight: 800;
  background: var(--bg-card);
  color: var(--text-1);
}
#udhar-otp-input:focus,
#add-customer-otp-input:focus {
  border-color: var(--brand);
  background: #fff;
  box-shadow: 0 0 0 3px var(--brand-glow);
}

#verify-otp-btn {
  width: 100%;
  padding: 12px;
  background: linear-gradient(135deg, var(--brand), #ff9a5c);
  color: #fff; border: none;
  border-radius: var(--r-lg);
  font-family: inherit;
  font-weight: 800; font-size: 0.88rem;
  cursor: pointer;
  position: relative;
  min-height: 48px;
  box-shadow: var(--sh-brand);
  transition: all 0.2s;
}
#verify-otp-btn:hover { transform: translateY(-1px); }

#otp-error,
#add-customer-otp-error {
  color: var(--red);
  margin-top: 8px;
  font-weight: 600;
  font-size: 0.8rem;
  display: none;
}

/* ── SR Only ──────────────────────────────────────────────────── */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border-width: 0;
}

/* ═══════════════════════════════════════════════════════════════════════════
   FINE-TUNING EDGE CASES
   ═══════════════════════════════════════════════════════════════════════════ */

/* Very small phone (360px) */
@media (max-width: 380px) {
  .pos-header { padding: 0 10px; }
  .header-center .logo { font-size: 0.88rem; }
  .header-left .back-link { font-size: 0.72rem; padding: 5px 10px; }
  .header-right .user-profile { font-size: 0.68rem; padding: 4px 9px; }

  .cart-item { grid-template-columns: 46px 1fr auto; padding: 10px; gap: 9px; }
  .cart-item img { width: 46px; height: 46px; }
  .item-total-price { font-size: 0.82rem; }

  .payment-options { grid-template-columns: 1fr; }
  .payment-options .payment-btn:nth-child(3) { grid-column: auto; }

  #customer-search { font-size: 0.75rem; }
  .add-btn { width: 36px; height: 36px; font-size: 0.9rem; }
}

/* Landscape phone / small tablet without two-column (640-767 range is already 2-col) */
@media (min-width: 640px) and (max-width: 767px) {
  .panel-body { padding: 13px; }
  .panel-section { padding-bottom: 13px; margin-bottom: 13px; }
}

/* Large desktop comfort margins */
@media (min-width: 1600px) {
  .checkout-container { max-width: 1600px; }
}