:root {
  --bg: #f4f5f7;
  --surface: #ffffff;
  --text: #15181d;
  --muted: #566070;
  --border: #c9cfd8;
  --primary: #0b5fd6;
  --primary-text: #ffffff;
  --ok-bg: #dff5e6;
  --ok-text: #0c5a26;
  --busy-bg: #fde8cf;
  --busy-text: #7a3d00;
  --error-bg: #fbe0e0;
  --error-text: #8a1212;
  --info-bg: #e3edfb;
  --info-text: #0f3d80;
  --focus: #b45309;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101317;
    --surface: #1a1f26;
    --text: #eef1f5;
    --muted: #a3adbb;
    --border: #3a4350;
    --primary: #6aa5ff;
    --primary-text: #07152b;
    --ok-bg: #11351d;
    --ok-text: #8fe0a9;
    --busy-bg: #3d2a10;
    --busy-text: #f6c58a;
    --error-bg: #431a1a;
    --error-text: #ffb4b4;
    --info-bg: #14284a;
    --info-text: #b6d1ff;
    --focus: #fbbf24;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.page-header {
  padding: 20px 16px 4px;
  max-width: 640px;
  margin: 0 auto;
}

h1 {
  margin: 0;
  font-size: 1.4rem;
}

h2 {
  margin: 0 0 12px;
  font-size: 1.05rem;
}

.subtitle {
  margin: 2px 0 0;
  color: var(--muted);
}

.page {
  max-width: 640px;
  margin: 0 auto;
  padding: 12px 16px 40px;
  display: grid;
  gap: 16px;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
}

.row {
  display: flex;
  gap: 12px;
  align-items: flex-end;
  flex-wrap: wrap;
}

.field {
  flex: 1 1 180px;
  display: grid;
  gap: 4px;
}

.label {
  font-size: 0.9rem;
  color: var(--muted);
}

input {
  min-height: 44px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font: inherit;
}

.hint {
  margin: 6px 0 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.btn {
  min-height: 44px;
  min-width: 44px;
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.btn-primary {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--primary-text);
}

.btn:disabled,
.card:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn-toggle {
  width: 100%;
}

.btn-toggle[aria-checked="true"] {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--primary-text);
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.modes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

@media (max-width: 420px) {
  .modes {
    grid-template-columns: 1fr;
  }
}

.banner {
  margin: 0;
  padding: 12px 16px;
  border-radius: 12px;
  background: var(--info-bg);
  color: var(--info-text);
}

.banner-error {
  background: var(--error-bg);
  color: var(--error-text);
}

.cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.card {
  width: 100%;
  min-height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.card-sku {
  margin-right: auto;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.card-price {
  color: var(--muted);
}

.badge {
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
}

.badge-free {
  background: var(--ok-bg);
  color: var(--ok-text);
}

.badge-busy {
  background: var(--busy-bg);
  color: var(--busy-text);
}

.actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.big {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 0 0 4px;
}

.countdown {
  font-variant-numeric: tabular-nums;
  font-size: 2rem;
  font-weight: 700;
  margin: 8px 0 0;
}

.progress {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 8px 0 0;
}

.qr-box {
  background: #ffffff;
  border-radius: 12px;
  padding: 0;
  display: inline-block;
  line-height: 0;
  max-width: 100%;
}

.qr-box svg {
  display: block;
  max-width: 100%;
  height: auto;
}

.qr-wrap {
  text-align: center;
  margin: 8px 0 16px;
}

.code-block {
  display: block;
  margin: 8px 0;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  font: 1rem/1.4 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  overflow-wrap: anywhere;
  user-select: all;
}

.empty {
  margin: 0;
  color: var(--muted);
}