/* ============================================================================
   Cashier UI Shell — used by /pages/sell, /pages/shift, /pages/receipt
   Design philosophy:
   - Tablet/touch primary (10"+ landscape)
   - Tap targets ≥ 48px (gloved/wet hands in market)
   - High contrast (overhead fluorescent lighting)
   - Single-column readable layout, no admin sidebar
   ============================================================================ */

.shell-topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--color-bg-card);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  min-height: 56px;
}

.shell-topbar .topbar-back {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 15px;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  min-height: 40px;
}
.shell-topbar .topbar-back:hover { background: rgba(255,255,255,0.05); color: var(--color-text); }

.shell-topbar .topbar-title {
  flex: 1;
  font-size: 20px;
  margin: 0;
  font-weight: 600;
}

.shell-topbar .topbar-user {
  font-size: 13px;
  color: var(--color-text-muted);
  text-align: right;
}
.shell-topbar .topbar-user .who-name {
  font-weight: 600;
  color: var(--color-text);
}

.shell-page {
  padding: var(--space-lg);
  max-width: 980px;
  margin: 0 auto;
}

.shell-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  padding: var(--space-lg);
  margin-bottom: var(--space-md);
}

.shell-card h2 {
  font-size: 18px;
  margin: 0 0 var(--space-md);
}

/* --- Status banner (state pills) --- */
.status-banner {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  font-weight: 600;
  margin-bottom: var(--space-md);
}
.status-banner.open {
  background: rgba(16,185,129,0.15);
  border: 1px solid var(--color-success);
  color: #6ee7b7;
}
.status-banner.closed {
  background: rgba(245,158,11,0.15);
  border: 1px solid var(--color-warn);
  color: #fde68a;
}
.status-banner .status-icon { font-size: 22px; }

/* --- Big action buttons (POS-style) --- */
.btn-big {
  min-height: 60px;
  font-size: 18px;
  font-weight: 700;
  padding: var(--space-md) var(--space-lg);
}

.btn-row {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin-top: var(--space-md);
}
.btn-row .btn { flex: 1 1 auto; min-width: 160px; }

/* --- Summary stats grid (X/Z-report) --- */
.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
}
.summary-stat {
  background: rgba(0,0,0,0.2);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}
.summary-stat .label {
  font-size: 12px;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}
.summary-stat .value {
  font-size: 24px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.summary-stat .sub {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* --- Definition list (key/value) for shift detail --- */
.kv-list {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: var(--space-sm) var(--space-md);
  margin: 0;
}
.kv-list dt { color: var(--color-text-muted); font-size: 14px; }
.kv-list dd { margin: 0; font-weight: 600; font-variant-numeric: tabular-nums; }

/* --- Variance display (positive=green, negative=red, zero=muted) --- */
.variance-display {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.variance-display.positive { background: rgba(16,185,129,0.15); color: #6ee7b7; }
.variance-display.negative { background: rgba(239,68,68,0.15); color: #fca5a5; }
.variance-display.zero { background: rgba(148,163,184,0.15); color: #94a3b8; }

/* --- Z-report print-friendly --- */
@media print {
  .shell-topbar, .btn-row, .no-print { display: none !important; }
  body { background: white; color: black; }
  .shell-card { border: none; background: white; }
  .shell-page { max-width: 100%; padding: 0; }
}

/* --- Responsive: stack on phone --- */
@media (max-width: 600px) {
  .shell-topbar { flex-wrap: wrap; }
  .shell-topbar .topbar-title { font-size: 16px; flex: 1 1 100%; order: -1; text-align: center; }
  .kv-list { grid-template-columns: 1fr; gap: 4px; }
  .kv-list dt { margin-top: 8px; }
  .shell-page { padding: var(--space-md); }
}