/* ═══════════════════════════════════════════════════════════════
   checkout.css — impre.mx Checkout · Design System
   Consumes tokens from root.css · Light theme · March 2026
   ═══════════════════════════════════════════════════════════════ */

/* ── Checkout wrapper ─────────────────────────────────────────── */

.bn-checkout {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  min-height: 100vh;
  padding: clamp(1.25rem, 3vw, 2.75rem);
  box-sizing: border-box;
}

.bn-checkout__wrap {
  width: 100%;
  max-width: 80rem;
  margin: 0 auto;
}


/* ── Header ───────────────────────────────────────────────────── */

.bn-checkout__header {
  display: flex;
  flex-direction: column;
  gap: .45rem;
  padding-bottom: clamp(.85rem, 2vw, 1.25rem);
  border-bottom: 1px solid var(--color-border);
  margin: 0 0 clamp(1rem, 2.4vw, 1.8rem);
}

.bn-checkout__title {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(1.75rem, 2.8vw, 2.5rem);
  line-height: 1.1;
  color: var(--color-text);
  margin: 0;
  letter-spacing: -.01em;
}

.bn-checkout__subtitle {
  margin: 0;
  color: var(--color-muted);
  font-size: .95rem;
  line-height: 1.55;
  max-width: 65ch;
}


/* ── Grid layout ──────────────────────────────────────────────── */

.bn-checkout__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.15rem, 3vw, 2.25rem);
  align-items: start;
  position: relative;
}


/* ── Cart column ──────────────────────────────────────────────── */

.bn-checkout__cart {
  display: flex;
  flex-direction: column;
  gap: clamp(.85rem, 2vw, 1.15rem);
  min-width: 0;
}

.bn-checkout__items {
  border-radius: var(--radius-card);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  min-height: 160px;
  position: relative;
}


/* ── Empty state ──────────────────────────────────────────────── */

.bn-checkout__empty {
  border-radius: var(--radius-card);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
  padding: clamp(1rem, 2.2vw, 1.35rem);
}

.bn-checkout__empty-title {
  margin: 0 0 .35rem 0;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 1.15rem;
  color: var(--color-text);
}

.bn-checkout__empty-text {
  margin: 0 0 1rem 0;
  color: var(--color-muted);
  line-height: 1.55;
  font-size: .95rem;
}

.bn-checkout__empty-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .85rem 1.25rem;
  border-radius: var(--radius-btn);
  background: var(--color-accent);
  border: none;
  color: #fff;
  text-decoration: none;
  font-family: var(--font-body);
  font-weight: var(--font-weight-600);
  font-size: .95rem;
  box-shadow: var(--shadow-cta);
  transition: transform .12s ease, background .2s ease;
}

.bn-checkout__empty-cta:hover {
  transform: translateY(-1px);
  background: var(--color-accent-hover);
}

.bn-checkout__empty-cta:active {
  transform: translateY(1px);
}

.bn-checkout__empty-inline {
  padding: 1rem;
  color: var(--color-muted);
  font-weight: var(--font-weight-600);
}


/* ── Skeleton loader ──────────────────────────────────────────── */

.bn-checkout__skeleton {
  display: flex;
  flex-direction: column;
  gap: .7rem;
  padding: clamp(1rem, 2.2vw, 1.25rem);
}

.bn-checkout__skeleton-row {
  height: 16px;
  border-radius: var(--radius-pill);
  background: rgba(26, 26, 27, 0.06);
  overflow: hidden;
  position: relative;
}

.bn-checkout__skeleton-row::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(114, 150, 212, 0.08), transparent);
  transform: translateX(-60%);
  animation: bn-skeleton 1.25s ease-in-out infinite;
}

@keyframes bn-skeleton {
  0%   { transform: translateX(-60%); }
  100% { transform: translateX(60%); }
}


/* ── Cart item ────────────────────────────────────────────────── */

.bn-checkout__item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1rem;
  align-items: center;
  padding: 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-btn);
  margin-bottom: .75rem;
}

.bn-checkout__item:last-child {
  margin-bottom: 0;
}

.bn-checkout__item-image {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-btn);
  overflow: hidden;
  background: var(--color-cloud);
  flex-shrink: 0;
}

.bn-checkout__item-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.bn-checkout__item-main {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  min-width: 0;
}

.bn-checkout__item-title {
  font-weight: var(--font-weight-600);
  font-size: .95rem;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.bn-checkout__item-meta {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
}

.bn-checkout__item-chip {
  display: inline-block;
  padding: .2rem .5rem;
  background: rgba(26, 26, 27, 0.05);
  border-radius: 4px;
  font-size: .78rem;
  color: var(--color-muted);
  border: 1px solid var(--color-border);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  letter-spacing: .02em;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.bn-checkout__item-chip--tech {
  background: rgba(114, 150, 212, 0.08);
  border-color: rgba(114, 150, 212, 0.20);
  color: var(--color-accent);
}

.bn-checkout__item-tag {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .35rem .55rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(114, 150, 212, 0.20);
  background: rgba(114, 150, 212, 0.06);
  color: var(--color-accent);
  font-size: .78rem;
  letter-spacing: .03em;
  text-transform: uppercase;
  font-weight: var(--font-weight-600);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.bn-checkout__item-price {
  font-size: .88rem;
  color: var(--color-muted);
  margin-top: .2rem;
}

.bn-checkout__item-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: .5rem;
}

.bn-checkout__item-subtotal {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-accent);
}


/* ── Quantity controls ────────────────────────────────────────── */

.bn-checkout__qty-controls {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  align-items: flex-end;
}

.bn-checkout__qty-row {
  display: flex;
  align-items: center;
  gap: .5rem;
}

.bn-checkout__qty-pill {
  color: var(--color-text);
  font-weight: var(--font-weight-600);
  font-size: .9rem;
  padding: .25rem .55rem;
  border-radius: var(--radius-btn);
  border: 1px solid var(--color-border);
  background: var(--color-cloud);
}

.bn-checkout__qty {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .5rem .6rem;
  border-radius: var(--radius-btn);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}

.bn-checkout__qty-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-btn);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font-weight: var(--font-weight-600);
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: transform .12s ease, background .15s ease, border-color .15s ease;
}

.bn-checkout__qty-btn:hover:not(:disabled) {
  transform: translateY(-1px);
  background: var(--color-cloud);
  border-color: rgba(26, 26, 27, 0.18);
}

.bn-checkout__qty-btn:active:not(:disabled) {
  transform: translateY(1px);
}

.bn-checkout__qty-btn:disabled {
  opacity: .35;
  cursor: not-allowed;
}

.bn-checkout__qty-btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.bn-checkout__qty-input {
  width: 60px;
  height: 36px;
  border-radius: var(--radius-btn);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-weight: var(--font-weight-600);
  font-size: .95rem;
  text-align: center;
  -moz-appearance: textfield;
}

.bn-checkout__qty-input::-webkit-outer-spin-button,
.bn-checkout__qty-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.bn-checkout__qty-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: var(--focus-ring);
}

.bn-checkout__qty-label {
  color: var(--color-muted);
  font-size: .72rem;
  font-weight: var(--font-weight-600);
  letter-spacing: .06em;
  text-transform: uppercase;
}

.bn-checkout__stock-hint {
  font-size: .72rem;
  color: var(--color-muted);
  letter-spacing: .02em;
}


/* ── Remove button ────────────────────────────────────────────── */

.bn-checkout__remove,
.bn-checkout__qty-remove {
  padding: .45rem .7rem;
  border-radius: var(--radius-btn);
  border: 1px solid rgba(196, 66, 75, 0.20);
  background: rgba(196, 66, 75, 0.06);
  color: var(--color-danger);
  font-family: var(--font-body);
  font-weight: var(--font-weight-600);
  font-size: .8rem;
  cursor: pointer;
  transition: transform .12s ease, background .15s ease, border-color .15s ease;
}

.bn-checkout__remove:hover,
.bn-checkout__qty-remove:hover {
  transform: translateY(-1px);
  background: rgba(196, 66, 75, 0.10);
  border-color: rgba(196, 66, 75, 0.30);
}

.bn-checkout__remove:active,
.bn-checkout__qty-remove:active {
  transform: translateY(1px);
}

.bn-checkout__remove:focus-visible,
.bn-checkout__qty-remove:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px rgba(196, 66, 75, 0.25);
}


/* ── Totals ───────────────────────────────────────────────────── */

.bn-checkout__totals {
  border-radius: var(--radius-card);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
  padding: clamp(1rem, 2.2vw, 1.25rem);
  display: flex;
  flex-direction: column;
  gap: .6rem;
}

.bn-checkout__totals-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.bn-checkout__totals-label {
  color: var(--color-muted);
  font-size: .9rem;
  font-weight: var(--font-weight-600);
}

.bn-checkout__totals-value {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  color: var(--color-text);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: .04em;
}

.bn-checkout__totals-row--total {
  padding-top: .75rem;
  margin-top: .5rem;
  border-top: 1px solid var(--color-border);
}

.bn-checkout__totals-row--total .bn-checkout__totals-label {
  color: var(--color-text);
  font-weight: var(--font-weight-600);
}

.bn-checkout__totals-row--total .bn-checkout__totals-value {
  color: var(--color-accent);
  font-size: 1.15rem;
}

.bn-checkout__totals-note {
  color: var(--color-muted);
  font-size: .82rem;
  line-height: 1.45;
  padding-top: .25rem;
  border-top: 1px solid var(--color-border);
}


/* ── Form ─────────────────────────────────────────────────────── */

.bn-checkout__form {
  border-radius: var(--radius-card);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.bn-checkout__fieldset {
  border: none;
  margin: 0;
  padding: clamp(1rem, 2.2vw, 1.35rem);
  display: flex;
  flex-direction: column;
  gap: .85rem;
}

.bn-checkout__legend {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 1.15rem;
  color: var(--color-text);
  margin: 0 0 .35rem 0;
  padding-top: 1rem;
}

.bn-checkout__field {
  display: flex;
  flex-direction: column;
  gap: .4rem;
}

.bn-checkout__label {
  color: var(--color-muted);
  font-size: .82rem;
  font-weight: var(--font-weight-600);
  letter-spacing: .05em;
  text-transform: uppercase;
}


/* ── Inputs ───────────────────────────────────────────────────── */

.bn-checkout__input,
.bn-checkout__textarea {
  width: 100%;
  box-sizing: border-box;
  border-radius: var(--radius-btn);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font-family: var(--font-body);
  font-weight: var(--font-weight-400);
  font-size: 1rem;
  padding: .85rem 1rem;
  transition: border-color .2s ease, box-shadow .2s ease;
}

.bn-checkout__textarea {
  resize: vertical;
  min-height: 110px;
  line-height: 1.55;
}

.bn-checkout__input:hover,
.bn-checkout__textarea:hover {
  border-color: rgba(26, 26, 27, 0.18);
}

.bn-checkout__input:focus,
.bn-checkout__textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: var(--focus-ring);
}

.bn-checkout__input::placeholder,
.bn-checkout__textarea::placeholder {
  color: var(--color-muted);
}

/* Validation states */
.bn-checkout__input.is-invalid {
  border-color: var(--color-danger);
  box-shadow: 0 0 0 2px rgba(196, 66, 75, 0.15);
}

.bn-checkout__input.is-valid {
  border-color: var(--color-success);
}

.bn-checkout__field-error {
  color: var(--color-danger);
  font-size: .82rem;
  margin-top: .25rem;
  display: none;
}

.bn-checkout__field-error.is-visible {
  display: block;
}


/* ── Error banner ─────────────────────────────────────────────── */

.bn-checkout__error {
  background: rgba(196, 66, 75, 0.06);
  border: 1px solid rgba(196, 66, 75, 0.20);
  border-radius: var(--radius-btn);
  padding: .85rem 1rem;
  color: var(--color-danger);
  font-size: .9rem;
  margin-bottom: 1rem;
}

.bn-checkout__error:empty,
.bn-checkout__error[hidden] {
  display: none;
}


/* ── Form actions ─────────────────────────────────────────────── */

.bn-checkout__actions {
  padding: clamp(1rem, 2.2vw, 1.35rem);
  border-top: 1px solid var(--color-border);
  background: var(--color-cloud);
  display: flex;
  flex-direction: column;
  gap: .65rem;
}

.bn-checkout__submit {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 1.25rem;
  background: var(--color-accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-btn);
  font-family: var(--font-body);
  font-weight: var(--font-weight-600);
  font-size: 1rem;
  letter-spacing: .02em;
  cursor: pointer;
  box-shadow: var(--shadow-cta);
  transition: transform .12s ease, box-shadow .2s ease, background .2s ease;
}

.bn-checkout__submit:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 32px rgba(114, 150, 212, 0.30);
  background: var(--color-accent-hover);
}

.bn-checkout__submit:active {
  transform: translateY(1px);
  box-shadow: 0 6px 18px rgba(114, 150, 212, 0.20);
}

.bn-checkout__submit:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring), var(--shadow-cta);
}

.bn-checkout__submit:disabled {
  opacity: .45;
  cursor: not-allowed;
  transform: none;
  box-shadow: 0 8px 20px rgba(114, 150, 212, 0.10);
}

.bn-checkout__actions-note {
  color: var(--color-muted);
  font-size: .84rem;
  line-height: 1.45;
  margin-top: 1rem;
  text-align: center;
}

.bn-checkout__actions-note.is-ok {
  color: var(--color-success);
}

.bn-checkout__actions-note.is-err {
  color: var(--color-danger);
}


/* ── Loading state ────────────────────────────────────────────── */

.bn-checkout__btn.is-loading {
  pointer-events: none;
  opacity: 0.7;
  position: relative;
}

.bn-checkout__btn.is-loading::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border: 2px solid transparent;
  border-top-color: currentColor;
  border-radius: 50%;
  animation: bn-spin 0.7s linear infinite;
  margin-left: 8px;
}

@keyframes bn-spin {
  to { transform: rotate(360deg); }
}


/* ── Toast (shared with PDP) ──────────────────────────────────── */

.bn-toast__text {
  color: var(--color-muted);
  font-size: 0.88rem;
}


/* ═══════════════════════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════════════════════ */

@media (min-width: 1024px) {
  .bn-checkout {
    padding: clamp(1.5rem, 2.6vw, 3rem);
  }

  .bn-checkout__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: clamp(2rem, 3.6vw, 3rem);
    align-items: start;
  }

  .bn-checkout__cart {
    position: sticky;
    top: 2.25rem;
  }
}

@media (min-width: 1280px) {
  .bn-checkout__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  }
}

@media (max-width: 600px) {
  .bn-checkout__item {
    grid-template-columns: 1fr;
    gap: .75rem;
  }

  .bn-checkout__item-image {
    width: 100%;
    height: 120px;
  }

  .bn-checkout__item-actions {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    gap: .75rem;
  }

  .bn-checkout__qty-controls {
    align-items: flex-start;
  }
}

@media (max-width: 520px) {
  .bn-checkout__qty {
    width: 100%;
    justify-content: space-between;
  }

  .bn-checkout__qty-input {
    width: 96px;
  }
}