.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.preorder-page .lang-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0 0 1.25rem;
}

.preorder-page .lang-switch button {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--ink);
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  cursor: pointer;
  font: inherit;
  font-size: 0.9rem;
}

.preorder-page .lang-switch button.is-active,
.preorder-page .lang-switch button:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.preorder-hero {
  padding: 1.5rem 0 2rem;
}

.preorder-hero h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  margin: 0 0 0.5rem;
}

.preorder-hero .hero-note {
  color: var(--muted);
  font-size: 0.95rem;
  max-width: 42rem;
}

.edition-grid {
  display: grid;
  gap: 1.25rem;
  margin: 1.5rem 0 0;
  list-style: none;
  padding: 0;
}

@media (min-width: 720px) {
  .edition-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.edition-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.edition-card.is-soldout {
  opacity: 0.72;
  background: #f3f0ea;
}

.edition-card.is-soldout .edition-card__cover {
  filter: grayscale(0.35);
}

.edition-card__stock {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.edition-card__stock--soldout {
  color: var(--accent);
  font-weight: 600;
}

.edition-card__soldout-msg {
  margin: 0.25rem 0 0;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
}

.edition-card.is-selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-soft);
}

.edition-card__cover {
  aspect-ratio: 2 / 3;
  background: #eee8e0;
  border-radius: 4px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.edition-card__cover img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.edition-card__title {
  font-family: var(--font-sans);
  font-weight: 600;
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.35;
}

.edition-card__meta {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.edition-card__price {
  margin: 0;
  font-weight: 600;
  color: var(--accent);
}

.edition-card__row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: auto;
}

.edition-card__row label {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  cursor: pointer;
  font-size: 0.95rem;
}

.edition-card__row input[type="number"] {
  width: 4rem;
  padding: 0.35rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  font: inherit;
}

.preorder-section {
  padding: 2rem 0;
  border-top: 1px solid var(--border);
}

.preorder-section h3 {
  font-family: var(--font-serif);
  margin: 0 0 0.35rem;
  font-size: 1.35rem;
}

.preorder-section .section-desc {
  color: var(--muted);
  margin: 0 0 1.25rem;
  font-size: 0.95rem;
}

.series-groups {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.series-group {
  background: var(--card);
  border: 2px solid var(--border);
  border-radius: 12px;
  padding: 1.15rem 1.15rem 1rem;
  box-shadow: 0 2px 8px rgba(26, 20, 16, 0.06);
}

.series-group--hero {
  border-color: var(--accent-soft);
  background: linear-gradient(180deg, #fffdf9 0%, var(--accent-soft) 120%);
}

.series-group__title {
  font-family: var(--font-serif);
  margin: 0 0 0.85rem;
  padding-bottom: 0.55rem;
  border-bottom: 2px solid var(--accent-soft);
  font-size: 1.12rem;
  font-weight: 600;
  color: var(--accent);
  line-height: 1.35;
}

.series-group__desc {
  margin: -0.35rem 0 0.75rem;
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.45;
}

.series-group .addon-grid {
  margin: 0;
}

.addon-grid {
  display: grid;
  gap: 1rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

@media (min-width: 600px) {
  .addon-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .addon-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.addon-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.85rem;
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 0.75rem;
  align-items: start;
}

.addon-card.is-checked,
.addon-card.is-selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-soft);
}

.addon-card__thumb {
  width: 72px;
  height: 108px;
  background: #eee8e0;
  border-radius: 4px;
  overflow: hidden;
  font-size: 0.7rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0.25rem;
}

.addon-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.addon-card__lang {
  margin: 0 0 0.35rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
}

.addon-card__body h4 {
  margin: 0 0 0.25rem;
  font-size: 0.92rem;
  line-height: 1.35;
  font-weight: 600;
}

.addon-card__price {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 500;
}

.addon-card__footer {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* 結帳區：加總 → 匯款 → 聯絡（桌機版加總＋匯款固定左欄） */
.preorder-checkout {
  padding: 2rem 0 3rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

@media (min-width: 900px) {
  .preorder-checkout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 1.5rem 2rem;
    align-items: start;
  }

  .order-summary,
  .bank-transfer {
    grid-column: 1;
  }

  .preorder-form {
    grid-column: 2;
    grid-row: 1 / span 2;
  }
}

.preorder-form {
  padding: 0;
  border-top: none;
}

.preorder-form .field {
  margin-bottom: 1rem;
  max-width: 28rem;
}

.preorder-form label {
  display: block;
  margin-bottom: 0.35rem;
  font-weight: 500;
}

.preorder-form input,
.preorder-form textarea {
  width: 100%;
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  font: inherit;
  background: var(--card);
}

.preorder-form textarea {
  min-height: 5rem;
  resize: vertical;
}

.preorder-form .submit-btn {
  border: none;
  background: var(--accent);
  color: #fff;
  padding: 0.65rem 1.5rem;
  border-radius: 999px;
  font: inherit;
  font-size: 1rem;
  cursor: pointer;
  margin-top: 0.5rem;
}

.preorder-form .submit-btn:hover {
  filter: brightness(1.08);
}

.preorder-form .form-hint {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0.75rem 0 0;
  max-width: 36rem;
}

.preorder-form .field-honeypot {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.preorder-form .form-status {
  margin: 0.75rem 0 0;
  padding: 0.65rem 0.85rem;
  border-radius: 8px;
  font-size: 0.95rem;
  max-width: 36rem;
}

.preorder-form .form-status.is-success {
  background: #e8f5e9;
  color: #1b5e20;
}

.preorder-form .form-status.is-error {
  background: #ffebee;
  color: #b71c1c;
}

.preorder-form .submit-btn:disabled {
  opacity: 0.65;
  cursor: wait;
}

.preorder-banner {
  background: var(--accent-soft);
  color: var(--ink);
  padding: 0.65rem 0;
  text-align: center;
  font-size: 0.95rem;
}

.preorder-banner a {
  color: var(--accent);
  font-weight: 600;
}

.order-summary {
  padding: 1.25rem 1.35rem;
  background: var(--accent-soft);
  border: 1px solid var(--border);
  border-radius: 12px;
}

@media (min-width: 900px) {
  .order-summary {
    position: sticky;
    top: 1rem;
  }
}

.order-summary h3 {
  font-family: var(--font-serif);
  margin: 0 0 0.75rem;
  font-size: 1.35rem;
}

.summary-empty {
  color: var(--muted);
  margin: 0;
  font-size: 0.95rem;
}

.summary-empty.is-hidden {
  display: none;
}

.summary-lines {
  list-style: none;
  margin: 0 0 0.75rem;
  padding: 0;
  max-width: 36rem;
}

.summary-lines li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.45rem 0;
  border-bottom: 1px dashed var(--border);
  font-size: 0.95rem;
}

.summary-lines__title {
  flex: 1;
  min-width: 0;
}

.summary-lines__amount {
  white-space: nowrap;
  font-weight: 500;
}

.summary-total {
  display: none;
  margin: 0.5rem 0 0;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
  font-family: var(--font-serif);
}

.summary-total.is-visible {
  display: block;
}

.bank-transfer {
  padding: 1.15rem 1.35rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.bank-transfer h3 {
  font-family: var(--font-serif);
  margin: 0 0 1rem;
  font-size: 1.2rem;
  color: var(--accent);
}

.bank-dl {
  margin: 0;
  display: grid;
  grid-template-columns: 6.5rem 1fr;
  gap: 0.55rem 1rem;
  max-width: 28rem;
  align-items: baseline;
}

.bank-dl dt {
  margin: 0;
  font-weight: 600;
  color: var(--muted);
  font-size: 0.9rem;
}

.bank-dl dd {
  margin: 0;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.bank-note {
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
  max-width: 36rem;
}

/* 手機版：加大左右留白，避免表單與文字貼邊 */
@media (max-width: 767px) {
  .preorder-page .wrap {
    padding-left: max(1.5rem, calc(env(safe-area-inset-left, 0px) + 1.25rem));
    padding-right: max(1.5rem, calc(env(safe-area-inset-right, 0px) + 1.25rem));
  }

  .preorder-page main {
    overflow-x: hidden;
  }

  .preorder-checkout {
    gap: 1.5rem;
  }

  .order-summary,
  .bank-transfer {
    padding: 1.2rem 1.15rem;
  }

  .preorder-form h3 {
    margin: 0 0 1rem;
    font-size: 1.25rem;
  }

  .preorder-form .field {
    max-width: none;
    margin-bottom: 1.15rem;
  }

  .preorder-form label {
    line-height: 1.45;
  }

  .preorder-form input,
  .preorder-form textarea {
    padding: 0.65rem 0.75rem;
    font-size: 16px; /* 避免 iOS 自動放大 */
  }

  .preorder-form .form-hint {
    max-width: none;
    line-height: 1.55;
    padding-right: 0.15rem;
  }

  .bank-dl {
    max-width: none;
    grid-template-columns: 5.75rem 1fr;
    gap: 0.5rem 0.85rem;
  }

  .bank-note {
    max-width: none;
    line-height: 1.55;
  }

  .summary-lines {
    max-width: none;
  }
}

@media (max-width: 380px) {
  .preorder-page .wrap {
    padding-left: max(1.35rem, calc(env(safe-area-inset-left, 0px) + 1rem));
    padding-right: max(1.35rem, calc(env(safe-area-inset-right, 0px) + 1rem));
  }

  .bank-dl {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }

  .bank-dl dt {
    margin-top: 0.65rem;
  }

  .bank-dl dt:first-child {
    margin-top: 0;
  }
}