/* ==========================================================================
 * bills.css — Bill finalization and printing page styles
 *
 * Receipt-like centered card layout for the bill page. Includes styles for
 * the order summary table, totals section, payment method radio group,
 * status badges, and action buttons.
 *
 * Design reference: design.md Section 5 (Bill Page)
 * Requirements: 4 (Bill Page UI)
 * ========================================================================== */

/* ------------------------------------------------------------------
 * Bill Page Layout
 *
 * Centered receipt-like card with max-width on desktop, full-width on mobile.
 * ------------------------------------------------------------------ */
.bill-page {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  max-width: 640px;
  margin: 0 auto;
  min-height: 0;
}

/* ------------------------------------------------------------------
 * Bill Header — back button + title + status badge
 * ------------------------------------------------------------------ */
.bill-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.bill-header__back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  color: var(--color-primary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
  border: none;
  background: none;
}

.bill-header__back:hover {
  background: rgba(37, 99, 235, 0.06);
}

.bill-header__title {
  flex: 1;
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
}

/* ------------------------------------------------------------------
 * Loading State
 * ------------------------------------------------------------------ */
.bill-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
  gap: var(--space-3);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

/* ------------------------------------------------------------------
 * Bill Content — main container after loading
 * ------------------------------------------------------------------ */
.bill-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

/* ------------------------------------------------------------------
 * Bill Info — order metadata (table, staff, date)
 * ------------------------------------------------------------------ */
.bill-info {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.bill-info__row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.bill-info__label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  min-width: 100px;
  flex-shrink: 0;
}

.bill-info__value {
  font-size: var(--font-size-sm);
  color: var(--color-text);
  font-weight: 500;
}

/* ------------------------------------------------------------------
 * Bill Summary Table — order items list
 * ------------------------------------------------------------------ */
.bill-summary {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.bill-summary__header {
  display: flex;
  align-items: center;
  padding: var(--space-3) var(--space-4);
  border-bottom: 2px solid var(--color-border);
  background: var(--color-bg);
}

.bill-summary__header .bill-summary__col {
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.bill-summary__row {
  display: flex;
  align-items: center;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.bill-summary__row:last-child {
  border-bottom: none;
}

.bill-summary__col {
  font-size: var(--font-size-sm);
  color: var(--color-text);
}

.bill-summary__col--name {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 500;
}

.bill-summary__col--qty {
  width: 40px;
  text-align: center;
  flex-shrink: 0;
}

.bill-summary__col--price {
  width: 90px;
  text-align: right;
  flex-shrink: 0;
}

.bill-summary__col--total {
  width: 100px;
  text-align: right;
  flex-shrink: 0;
  font-weight: 600;
}

.bill-summary__empty {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6) var(--space-4);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  text-align: center;
}

/* ------------------------------------------------------------------
 * Bill Totals Section
 * ------------------------------------------------------------------ */
.bill-totals {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.bill-totals__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.bill-totals__row--grand {
  padding-top: var(--space-3);
  margin-top: var(--space-2);
  border-top: 2px solid var(--color-border);
}

.bill-totals__label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
}

.bill-totals__value {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
  white-space: nowrap;
}

.bill-totals__row--grand .bill-totals__label {
  font-size: var(--font-size-base);
  color: var(--color-text);
}

.bill-totals__row--grand .bill-totals__value {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
}

/* ------------------------------------------------------------------
 * Payment Method Radio Group
 * ------------------------------------------------------------------ */
.bill-payment-methods {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}

.bill-payment-methods__title {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.bill-payment-methods__options {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.bill-payment-methods__option {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color var(--transition-fast),
              background-color var(--transition-fast);
  flex: 1;
  min-width: 120px;
  justify-content: center;
}

.bill-payment-methods__option:hover {
  border-color: var(--color-primary);
}

.bill-payment-methods__option--selected {
  border-color: var(--color-primary);
  background: rgba(37, 99, 235, 0.06);
}

.bill-payment-methods__radio {
  accent-color: var(--color-primary);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.bill-payment-methods__label {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
}

/* ------------------------------------------------------------------
 * Payment Method Display (after finalization, read-only)
 * ------------------------------------------------------------------ */
.bill-payment-display {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.bill-payment-display__label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
}

.bill-payment-display__value {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
}

/* ------------------------------------------------------------------
 * Bill Action Buttons
 * ------------------------------------------------------------------ */
.bill-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.bill-actions__notice {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--color-warning-bg, #fff3cd);
  border: 1px solid var(--color-warning-border, #ffc107);
  border-radius: var(--radius-md);
  color: var(--color-warning-text, #856404);
  font-size: var(--font-size-sm);
}

/* ------------------------------------------------------------------
 * Badge variant: badge--info (used for bill status "Da xuat hoa don")
 * Added here since components.css does not include it yet.
 * ------------------------------------------------------------------ */
.badge--info {
  background: #dbeafe;
  color: #1e40af;
}

/* ------------------------------------------------------------------
 * Button variant: btn--warning (used for retry print button)
 * Added here since components.css does not include it yet.
 * ------------------------------------------------------------------ */
.btn--warning {
  background: var(--color-warning);
  color: var(--color-text-inverse);
}

.btn--warning:hover:not(:disabled) {
  opacity: 0.9;
}

/* ------------------------------------------------------------------
 * Responsive: Mobile (<768px)
 *
 * Full-width layout, sticky action buttons at bottom, larger touch
 * targets for radio buttons.
 * ------------------------------------------------------------------ */
@media (max-width: 767px) {
  .bill-page {
    gap: var(--space-3);
  }

  .bill-header {
    gap: var(--space-2);
  }

  .bill-header__title {
    font-size: var(--font-size-base);
  }

  .bill-info__label {
    min-width: 80px;
  }

  /* Narrower columns for small screens */
  .bill-summary__col--price {
    width: 75px;
  }

  .bill-summary__col--total {
    width: 85px;
  }

  /* Larger touch targets for payment method options */
  .bill-payment-methods__option {
    min-height: 44px;
    min-width: 0;
    padding: var(--space-3) var(--space-3);
  }

  .bill-payment-methods__radio {
    width: 20px;
    height: 20px;
  }

  /* Sticky action buttons at bottom */
  .bill-actions {
    position: sticky;
    bottom: calc(var(--bottom-nav-height) + env(safe-area-inset-bottom));
    background: var(--color-bg);
    padding: var(--space-3) 0;
    z-index: 10;
  }
}

/* ------------------------------------------------------------------
 * Responsive: Tablet (768px - 1024px)
 *
 * Centered card with some padding adjustments.
 * ------------------------------------------------------------------ */
@media (min-width: 768px) and (max-width: 1024px) {
  .bill-page {
    max-width: 560px;
  }

  .bill-payment-methods__option {
    min-height: 44px;
  }
}

/* ------------------------------------------------------------------
 * Keyboard Shortcut Hints
 * ------------------------------------------------------------------ */
.kbd-hint {
  display: inline-block;
  padding: 1px 6px;
  font-size: 11px;
  font-family: monospace;
  color: var(--color-text-secondary);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  margin-left: var(--space-2);
  vertical-align: middle;
  line-height: 1.4;
}

@media (max-width: 767px) {
  .kbd-hint {
    display: none;
  }
}

/* ------------------------------------------------------------------
 * Split Bill Modal
 * ------------------------------------------------------------------ */
.split-bill-tabs {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--space-2);
}
.split-bill-tab {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  background: none;
  border: none;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}
.split-bill-tab--active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.split-bill-items {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-height: 300px;
  overflow-y: auto;
}
.split-bill-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}
.split-bill-item__checkbox {
  accent-color: var(--color-primary);
  width: 18px;
  height: 18px;
}
.split-bill-item__name {
  flex: 1;
  font-size: var(--font-size-sm);
}
.split-bill-item__price {
  font-size: var(--font-size-sm);
  font-weight: 600;
  white-space: nowrap;
}

.split-bill-equal {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
}
.split-bill-equal__label {
  font-size: var(--font-size-sm);
  font-weight: 500;
}
.split-bill-equal__input {
  width: 80px;
}
.split-bill-equal__result {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* ------------------------------------------------------------------
 * Discount Display Line
 * ------------------------------------------------------------------ */
.bill-totals__row--discount .bill-totals__label {
  color: var(--color-success);
}
.bill-totals__row--discount .bill-totals__value {
  color: var(--color-success);
}