/**
 * Cart Scan - styles.
 * Mobile-first: the app is used one-handed, in a supermarket aisle, with a
 * trolley in the other hand. Tap targets are large, the total is always on
 * screen, and the layout widens into two columns on a desktop.
 */

:root {
  --market-deep-green: #1A4D2E;
  --market-fresh-green: #4F7942;
  --papaya-orange: #FF6B35;
  --mango-yellow: #F7B731;
  --coconut-cream: #FFF8E7;
  --tomato-red: #E74C3C;

  --stone-50: #FAFAF9;
  --stone-100: #F5F5F4;
  --stone-200: #E7E5E4;
  --stone-300: #D6D3D1;
  --stone-400: #A8A29E;
  --stone-500: #78716C;
  --stone-600: #57534E;
  --stone-800: #292524;
  --stone-900: #1C1917;

  --bg: var(--coconut-cream);
  --card: #FFFFFF;
  --text: var(--stone-900);
  --muted: var(--stone-500);
  --line: var(--stone-200);

  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 1px 2px rgba(28, 25, 23, .06), 0 8px 24px rgba(28, 25, 23, .07);
  --shadow-sm: 0 1px 2px rgba(28, 25, 23, .08);
  --font: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --mono: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, monospace;
}

* { box-sizing: border-box; }

/* Utility classes set display, so [hidden] has to win over them. */
[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  -webkit-text-size-adjust: 100%;
}

body {
  padding-bottom: 88px;
  min-height: 100vh;
}

/* ---------- header ---------- */

.app-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: linear-gradient(135deg, var(--market-deep-green), #133A22);
  color: #fff;
  padding: 12px 16px;
  box-shadow: var(--shadow-sm);
}

.app-header .row {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 1100px;
  margin: 0 auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: -.01em;
}

.brand .logo {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: var(--mango-yellow);
  color: var(--market-deep-green);
  display: grid;
  place-items: center;
  font-size: 1.1rem;
}

.brand small {
  display: block;
  font-weight: 500;
  font-size: .7rem;
  opacity: .75;
  letter-spacing: .02em;
}

.header-total {
  margin-left: auto;
  text-align: right;
  line-height: 1.15;
}

.header-total .label {
  font-size: .65rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  opacity: .75;
}

.header-total .value {
  font-size: 1.35rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.header-total .value.over { color: var(--mango-yellow); }

/* ---------- tabs ---------- */

.tabs {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 40;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: #fff;
  border-top: 1px solid var(--line);
  padding: 6px 4px calc(6px + env(safe-area-inset-bottom, 0px));
}

.tab {
  appearance: none;
  border: 0;
  background: none;
  padding: 8px 4px;
  border-radius: var(--radius-sm);
  color: var(--muted);
  font: inherit;
  font-size: .72rem;
  font-weight: 600;
  display: grid;
  gap: 2px;
  justify-items: center;
  cursor: pointer;
  position: relative;
}

.tab .icon { font-size: 1.15rem; }
.tab[aria-selected="true"] { color: var(--market-deep-green); background: rgba(26, 77, 46, .08); }

.tab .badge {
  position: absolute;
  top: 2px;
  right: calc(50% - 24px);
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  border-radius: 9px;
  background: var(--papaya-orange);
  color: #fff;
  font-size: .68rem;
  line-height: 18px;
}

.tab .badge:empty, .tab .badge[hidden] { display: none; }

/* ---------- layout ---------- */

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px;
  display: grid;
  gap: 16px;
}

.view[hidden] { display: none; }
.view { display: grid; gap: 16px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 16px;
}

.card h2 {
  margin: 0 0 4px;
  font-size: 1rem;
  letter-spacing: -.01em;
}

.card .hint {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: .82rem;
  line-height: 1.45;
}

.split { display: grid; gap: 16px; }

@media (min-width: 900px) {
  .split { grid-template-columns: 1.25fr .75fr; align-items: start; }
  body { padding-bottom: 24px; }
  .tabs {
    position: sticky;
    top: 62px;
    bottom: auto;
    max-width: 1100px;
    margin: 0 auto;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
  }
}

/* ---------- viewfinder ---------- */

.viewfinder {
  position: relative;
  aspect-ratio: 4 / 3;
  background: #0B1F13;
  border-radius: var(--radius);
  overflow: hidden;
  display: grid;
  place-items: center;
}

.viewfinder video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: none;
}

.viewfinder.live video { display: block; }
.viewfinder.live .placeholder { display: none; }

.placeholder {
  color: #9BB5A5;
  text-align: center;
  padding: 24px;
  font-size: .88rem;
  line-height: 1.5;
}

.placeholder .big { font-size: 2.2rem; display: block; margin-bottom: 8px; }

.reticle {
  position: absolute;
  inset: 18% 10%;
  border: 2px solid rgba(247, 183, 49, .9);
  border-radius: 12px;
  box-shadow: 0 0 0 100vmax rgba(11, 31, 19, .35);
  pointer-events: none;
  display: none;
}

.viewfinder.live .reticle { display: block; }

.reticle::after {
  content: '';
  position: absolute;
  left: 6px;
  right: 6px;
  top: 50%;
  height: 2px;
  background: var(--tomato-red);
  opacity: .85;
  animation: sweep 2.4s ease-in-out infinite;
}

@keyframes sweep {
  0%, 100% { transform: translateY(-40px); }
  50% { transform: translateY(40px); }
}

@media (prefers-reduced-motion: reduce) {
  .reticle::after { animation: none; }
}

/* ---------- buttons & forms ---------- */

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.btn {
  appearance: none;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
  font: inherit;
  font-weight: 600;
  font-size: .88rem;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  transition: transform .12s ease, background .16s ease, border-color .16s ease;
}

.btn:hover { background: var(--stone-50); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .5; cursor: not-allowed; }

.btn.primary {
  background: var(--market-deep-green);
  border-color: var(--market-deep-green);
  color: #fff;
}

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

.btn.accent {
  background: var(--papaya-orange);
  border-color: var(--papaya-orange);
  color: #fff;
}

.btn.danger { color: var(--tomato-red); border-color: #F3C9C4; }
.btn.ghost { background: transparent; }
.btn.small { padding: 7px 10px; font-size: .8rem; }
.btn.wide { width: 100%; justify-content: center; }

label.field {
  display: grid;
  gap: 5px;
  font-size: .78rem;
  font-weight: 600;
  color: var(--stone-600);
}

input[type="text"], input[type="number"], input[type="search"], select, textarea {
  font: inherit;
  font-size: .92rem;
  padding: 11px 12px;
  border: 1px solid var(--stone-300);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--text);
  width: 100%;
}

input:focus, select:focus, textarea:focus {
  outline: 2px solid rgba(79, 121, 66, .35);
  border-color: var(--market-fresh-green);
}

.grid-2 { display: grid; gap: 12px; grid-template-columns: 1fr 1fr; }
.grid-3 { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); }

.inline-form { display: flex; gap: 8px; }
.inline-form input { flex: 1; }

.switch { display: flex; align-items: center; gap: 10px; font-size: .85rem; font-weight: 600; color: var(--stone-600); }
.switch input { width: 18px; height: 18px; accent-color: var(--market-deep-green); }

/* ---------- status ---------- */

.status {
  margin-top: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: .85rem;
  background: var(--stone-100);
  color: var(--stone-600);
  display: flex;
  gap: 8px;
  align-items: flex-start;
  line-height: 1.4;
}

.status.ok { background: #E8F5E9; color: #1B5E20; }
.status.warn { background: #FFF4E0; color: #8A5A00; }
.status.err { background: #FDECEA; color: #A02417; }

/* ---------- cart lines ---------- */

.lines { display: grid; gap: 10px; }

.line {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px 12px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: #fff;
}

.line.flash { animation: flash .9s ease; }

@keyframes flash {
  from { background: #FFF3D6; border-color: var(--mango-yellow); }
  to { background: #fff; }
}

.line .name { font-weight: 700; font-size: .95rem; }
.line .meta { grid-column: 1 / -1; color: var(--muted); font-size: .78rem; font-family: var(--mono); }
.line .total { font-weight: 800; font-variant-numeric: tabular-nums; white-space: nowrap; }

.line .controls {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
}

.stepper {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--stone-300);
  border-radius: 999px;
  overflow: hidden;
}

.stepper button {
  appearance: none;
  border: 0;
  background: #fff;
  width: 34px;
  height: 34px;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--market-deep-green);
  cursor: pointer;
}

.stepper button:hover { background: var(--stone-100); }
.stepper .count { min-width: 34px; text-align: center; font-weight: 700; font-variant-numeric: tabular-nums; }

.line input.mini {
  width: 104px;
  padding: 7px 9px;
  font-size: .85rem;
}

.line .unit-hint {
  font-size: .78rem;
  color: var(--muted);
  margin-left: -4px;
}

.pill {
  display: inline-block;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: .7rem;
  font-weight: 700;
  background: var(--stone-100);
  color: var(--stone-600);
  text-transform: uppercase;
  letter-spacing: .04em;
}

.pill.weight { background: #E7F0E9; color: var(--market-deep-green); }
.pill.override { background: #FFF0E6; color: #B3480F; }

/* ---------- totals ---------- */

.totals { display: grid; gap: 8px; }

.totals .row {
  display: flex;
  justify-content: space-between;
  font-size: .9rem;
  color: var(--stone-600);
  font-variant-numeric: tabular-nums;
}

.totals .row.grand {
  border-top: 2px solid var(--stone-800);
  margin-top: 6px;
  padding-top: 10px;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text);
}

.budget-bar {
  height: 8px;
  border-radius: 999px;
  background: var(--stone-200);
  overflow: hidden;
  margin-top: 4px;
}

.budget-bar span {
  display: block;
  height: 100%;
  background: var(--market-fresh-green);
  transition: width .3s ease;
}

.budget-bar.over span { background: var(--tomato-red); }

.chip-row { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }

.chip {
  font-size: .76rem;
  background: var(--stone-100);
  border-radius: 999px;
  padding: 5px 10px;
  color: var(--stone-600);
  font-variant-numeric: tabular-nums;
}

.empty {
  text-align: center;
  padding: 28px 16px;
  color: var(--muted);
  font-size: .88rem;
  line-height: 1.5;
}

.empty .big { font-size: 2rem; display: block; margin-bottom: 6px; }

/* ---------- catalog ---------- */

.catalog-list { display: grid; gap: 8px; max-height: 420px; overflow: auto; }

.catalog-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}

.catalog-item .info { flex: 1; min-width: 0; }
.catalog-item .info b { display: block; font-size: .9rem; }
.catalog-item .info span { font-size: .75rem; color: var(--muted); font-family: var(--mono); }
.catalog-item .price { font-weight: 700; font-variant-numeric: tabular-nums; white-space: nowrap; }

/* ---------- dialog ---------- */

dialog {
  border: 0;
  border-radius: var(--radius);
  padding: 0;
  width: min(440px, calc(100vw - 32px));
  box-shadow: var(--shadow);
}

dialog::backdrop { background: rgba(28, 25, 23, .55); }
dialog .dialog-body { padding: 18px; display: grid; gap: 12px; }
dialog h3 { margin: 0; font-size: 1.05rem; }

/* ---------- receipt (print) ---------- */

.receipt { display: none; }

@media print {
  body > *:not(.receipt) { display: none !important; }
  body { padding: 0; background: #fff; }
  .receipt {
    display: block;
    font-family: var(--mono);
    font-size: 12px;
    color: #000;
    max-width: 320px;
    margin: 0 auto;
  }
  .receipt h1 { font-size: 15px; text-align: center; margin: 0 0 2px; }
  .receipt .sub { text-align: center; font-size: 11px; margin-bottom: 10px; }
  .receipt table { width: 100%; border-collapse: collapse; }
  .receipt td { padding: 2px 0; vertical-align: top; }
  .receipt td.num { text-align: right; white-space: nowrap; }
  .receipt .rule td { border-top: 1px dashed #000; padding-top: 4px; }
  .receipt .grand td { font-weight: 700; font-size: 14px; border-top: 1px solid #000; padding-top: 4px; }
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/*
 * "3 items not yet priced" sits directly under the grand total. It has to read
 * as a caveat on that number, not as another line of it - the whole point is
 * that the shopper knows the total is incomplete before they reach the till.
 */
.totals .row.warn {
  color: #8A5A00;
  font-weight: 600;
}

/* A live promotion. Green because it is good news, and quiet because the
   price beside it has already been discounted - this only explains why. */
.pill.deal {
  background: #E7F5EA;
  color: #1B6B33;
}