:root {
  --bg: #f5f4f1;
  --surface: #ffffff;
  --text: #1c1b19;
  --muted: #6b6862;
  --border: #e2dfd8;
  --accent: #635bff;
  --accent-text: #ffffff;
  --danger: #c0392b;
  --success: #1e8e3e;
  --radius: 12px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161514;
    --surface: #211f1d;
    --text: #f2f0ec;
    --muted: #a19d96;
    --border: #35322e;
    --danger: #ff6b5b;
    --success: #4cc26b;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

h1, h2 { margin: 0; }
h1 { font-size: 1.25rem; }
h2 { font-size: 1rem; margin-bottom: 12px; color: var(--muted); font-weight: 600; }

.topbar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.reader-picker { display: flex; align-items: center; gap: 8px; }
.reader-picker label { color: var(--muted); font-size: .9rem; }

select, input[type="number"] {
  font: inherit;
  color: inherit;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
}

.badge {
  font-size: .75rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 999px;
  background: #ffe8b3;
  color: #6b4b00;
}

.layout {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 16px;
  padding: 16px;
  max-width: 1100px;
  margin: 0 auto;
}

@media (max-width: 760px) {
  .layout { grid-template-columns: 1fr; }
  .cart { position: static; }
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
}

.product {
  display: flex;
  flex-direction: column;
  text-align: left;
  font: inherit;
  color: inherit;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0;
  overflow: hidden;
  cursor: pointer;
  transition: transform .08s ease, border-color .15s ease;
}
.product:hover { border-color: var(--accent); }
.product:active { transform: scale(.98); }
.product img, .product .placeholder {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: var(--border);
}
.product .info { padding: 12px; display: grid; gap: 4px; }
.product .name { font-weight: 600; }
.product .price { color: var(--muted); }
.product .in-cart { color: var(--accent); font-size: .85rem; font-weight: 600; }

.cart {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  align-self: start;
  position: sticky;
  top: 16px;
}

.cart-lines { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }

.cart-line {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.cart-line .name { font-weight: 600; }
.cart-line .line-total { text-align: right; font-variant-numeric: tabular-nums; }
.cart-line .controls { display: flex; align-items: center; gap: 6px; grid-column: 1 / -1; }
.cart-line input[type="number"] { width: 64px; text-align: center; padding: 6px; }

.qty-btn, .remove-btn {
  font: inherit;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: inherit;
  cursor: pointer;
}
.remove-btn { margin-left: auto; width: auto; padding: 0 10px; color: var(--danger); }

.cart-total {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin: 16px 0;
  font-size: 1.25rem;
  font-variant-numeric: tabular-nums;
}

.cart-actions { display: grid; grid-template-columns: 1fr 2fr; gap: 8px; }

button.primary, button.secondary {
  font: inherit;
  font-weight: 600;
  padding: 12px 16px;
  border-radius: 10px;
  cursor: pointer;
  border: 1px solid transparent;
}
button.primary { background: var(--accent); color: var(--accent-text); }
button.secondary { background: transparent; color: inherit; border-color: var(--border); }
button:disabled { opacity: .5; cursor: not-allowed; }

.muted { color: var(--muted); }
.error { color: var(--danger); min-height: 1.2em; margin: 12px 0 0; }

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .5);
  display: grid;
  place-items: center;
  padding: 16px;
}
.overlay[hidden] { display: none; }
.overlay-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 24px;
  width: min(420px, 100%);
  text-align: center;
}
.overlay-card.success h2 { color: var(--success); }
.overlay-card.failed h2 { color: var(--danger); }
.payment-amount { font-size: 2rem; font-weight: 700; margin: 12px 0; font-variant-numeric: tabular-nums; }
.overlay-actions { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 16px; }

.sales {
  grid-column: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}
.sales-head { display: flex; justify-content: space-between; align-items: baseline; }
.link-btn { font: inherit; background: none; border: 0; color: var(--accent); cursor: pointer; padding: 0; }
.sales-list { list-style: none; margin: 0; padding: 0; }
.sale {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-top: 1px solid var(--border);
}
.sale:first-child { border-top: 0; }
.sale-main { display: grid; gap: 2px; min-width: 0; flex: 1; }
.sale-amount { font-weight: 600; font-variant-numeric: tabular-nums; }
.sale-meta, .sale-desc { font-size: .85rem; overflow-wrap: anywhere; }
.sale .remove-btn { height: 36px; flex-shrink: 0; }
.refunded { font-size: .8rem; font-weight: 600; color: var(--danger); }

.topbar-right { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }

.idle-warning {
  position: fixed;
  left: 50%;
  bottom: 16px;
  transform: translateX(-50%);
  width: min(480px, calc(100% - 32px));
  background: var(--text);
  color: var(--bg);
  border-radius: 10px;
  padding: 12px 16px;
  text-align: center;
  z-index: 10;
}
.idle-warning[hidden] { display: none; }

.login-page { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login-card {
  display: grid;
  gap: 10px;
  width: min(360px, 100%);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.login-card h1 { margin-bottom: 4px; }
.login-card label { color: var(--muted); font-size: .9rem; }
.login-card input {
  font: inherit;
  color: inherit;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
}
.login-card .muted:empty, .login-card .error:empty { display: none; }

.lock-screen {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 16px;
  background: var(--bg);
}
.lock-screen[hidden] { display: none; }
.lock-screen #pin { font-size: 1.5rem; letter-spacing: .3em; text-align: center; }
.lock-screen .link-btn { justify-self: center; }