:root {
    color-scheme: light;
    font-family: "Noto Serif TC", "Source Han Serif TC", "Songti TC", "PMingLiU", "MingLiU", "Microsoft JhengHei", serif;
    --ink: #111827;
    --muted: #667085;
    --line: #d9e3ec;
    --brand: #2f80c1;
    --brand-dark: #12324d;
    --paper: #fff;
    --soft: #f4f8fb;
}
* { box-sizing: border-box; }
body { margin: 0; color: var(--ink); background: #fff; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
.checkout-header { min-height: 70px; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 0 28px; border-top: 4px solid #f6c33b; border-bottom: 1px solid var(--line); background: #fff; }
.brand { color: var(--brand-dark); font-size: 22px; font-weight: 900; }
.checkout-nav { display: flex; align-items: center; gap: 18px; color: #334155; font-weight: 800; }
.checkout-nav a:hover { color: var(--brand); }
main { max-width: 1180px; margin: 0 auto; padding: 34px 22px 70px; }
.cart-top-actions { margin-bottom: 18px; }
.page-title { margin-bottom: 24px; }
.page-title h1 { margin: 0; font-size: 30px; line-height: 1.25; }
.page-title p { margin: 8px 0 0; color: var(--muted); line-height: 1.7; }
.page-title-row { display: flex; align-items: flex-start; justify-content: space-between; gap: 18px; }
.back-button { min-height: 38px; display: inline-flex; align-items: center; justify-content: center; flex: 0 0 auto; padding: 0 14px; border: 1px solid var(--line); border-radius: 999px; background: #fff; color: var(--brand-dark); font-size: 14px; font-weight: 900; }
.status { margin-bottom: 18px; padding: 12px 14px; border: 1px solid #cce8da; border-radius: 8px; background: #f0fbf6; color: #166534; font-weight: 800; }
.cart-layout, .checkout-layout { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 24px; align-items: start; }
.panel { border: 1px solid var(--line); border-radius: 8px; background: var(--paper); box-shadow: 0 16px 38px rgba(15,23,42,.06); }
.cart-list { display: grid; }
.cart-item { display: grid; grid-template-columns: 96px minmax(0, 1fr) 130px 160px; gap: 16px; align-items: center; padding: 18px; border-bottom: 1px solid #edf2f7; }
.cart-item:last-child { border-bottom: 0; }
.cart-thumb { width: 96px; aspect-ratio: 1; overflow: hidden; border-radius: 8px; background: var(--soft); }
.cart-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.cart-name { font-weight: 900; line-height: 1.5; }
.cart-option { margin-top: 4px; color: var(--muted); font-size: 13px; }
.cart-stock { margin-top: 6px; color: #2f80c1; font-size: 13px; font-weight: 900; }
.cart-price, .cart-total { font-weight: 900; color: var(--brand-dark); }
.cart-controls { min-width: 0; display: grid; justify-items: start; gap: 6px; }
.quantity-form { display: grid; grid-template-columns: 64px 38px 38px; align-items: center; gap: 7px; }
.quantity-form input { width: 64px; min-height: 38px; border: 1px solid var(--line); border-radius: 6px; padding: 0 8px; text-align: center; }
.quantity-step-button { width: 38px; min-height: 38px; display: inline-grid; place-items: center; border: 1px solid var(--line); border-radius: 6px; background: #fff; color: var(--brand-dark); font-size: 20px; line-height: 1; font-weight: 900; cursor: pointer; }
.remove-button { border: 0; background: transparent; color: #b42318; font-weight: 900; cursor: pointer; }
.summary { position: sticky; top: 18px; padding: 22px; }
.summary h2 { margin: 0 0 18px; font-size: 20px; }
.summary-line { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-bottom: 12px; color: #334155; }
.summary-line strong { color: var(--ink); }
.summary-total { padding-top: 14px; border-top: 1px solid var(--line); font-size: 20px; font-weight: 900; }
.primary-button, .secondary-button { width: 100%; min-height: 46px; display: inline-flex; align-items: center; justify-content: center; border-radius: 999px; font-weight: 900; cursor: pointer; }
.primary-button { border: 0; background: #050505; color: #fff; }
.secondary-button { margin-top: 10px; border: 1px solid var(--line); background: #fff; color: var(--brand-dark); }
.content-page-actions { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin-top: 24px; }
.content-page-actions .secondary-button { margin-top: 0; }
.empty-cart { padding: 46px 22px; text-align: center; color: var(--muted); font-weight: 800; }
.cart-recommendations { margin-top: 26px; padding: 22px; }
.cart-recommendations-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; margin-bottom: 18px; }
.cart-recommendations-head span { display: block; color: #c79b62; font-size: 13px; font-weight: 900; text-transform: uppercase; }
.cart-recommendations-head h2 { margin: 5px 0 0; color: var(--brand-dark); font-size: 24px; line-height: 1.25; }
.cart-recommendations-head a { color: var(--brand-dark); font-weight: 900; text-decoration: underline; text-underline-offset: 4px; }
.cart-recommendation-shell { position: relative; display: grid; grid-template-columns: 42px minmax(0, 1fr) 42px; align-items: center; gap: 10px; }
.cart-recommendation-grid { min-width: 0; display: grid; grid-auto-flow: column; grid-auto-columns: minmax(210px, 240px); gap: 16px; overflow-x: auto; padding: 2px 2px 12px; scroll-snap-type: x mandatory; scrollbar-width: thin; }
.cart-recommendation-card { min-width: 0; display: grid; border: 1px solid #edf2f7; border-radius: 8px; overflow: hidden; background: #f8fafc; }
.cart-recommendation-grid .cart-recommendation-card { scroll-snap-align: start; }
.cart-recommendation-image { aspect-ratio: 1 / 1; display: block; overflow: hidden; background: #fff; }
.cart-recommendation-image img { width: 100%; height: 100%; display: block; object-fit: cover; transition: transform .18s ease; }
.cart-recommendation-card:hover .cart-recommendation-image img { transform: scale(1.04); }
.cart-recommendation-body { min-width: 0; display: grid; gap: 8px; padding: 13px; }
.cart-recommendation-body span { color: var(--brand); font-size: 12px; font-weight: 900; }
.cart-recommendation-body > a { min-height: 44px; color: var(--ink); font-weight: 900; line-height: 1.45; }
.cart-recommendation-body strong { color: var(--brand-dark); }
.cart-recommendation-body form { margin: 0; }
.cart-recommendation-body .restock-form { display: grid; gap: 8px; }
.cart-recommendation-body .restock-form input { width: 100%; min-height: 36px; border: 1px solid #d9e3ec; border-radius: 6px; padding: 0 10px; outline: 0; }
.cart-recommendation-body button { width: 100%; min-height: 38px; border: 1px solid #111; border-radius: 999px; background: #111; color: #fff; font-weight: 900; cursor: pointer; }
.cart-recommendation-body .restock-form button { border-color: #d9e3ec; background: #fff; color: var(--brand-dark); }
.cart-recommendation-arrow { width: 42px; height: 42px; display: grid; place-items: center; border: 1px solid #d9e3ec; border-radius: 999px; background: #fff; color: var(--brand-dark); font-size: 32px; line-height: 1; cursor: pointer; box-shadow: 0 12px 22px rgba(15, 23, 42, .08); }
.cart-recommendation-arrow:hover { border-color: var(--brand); color: var(--brand); }
.checkout-form { padding: 22px; display: grid; gap: 18px; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.field label { display: block; margin-bottom: 8px; font-weight: 900; }
.field input, .field select, .field textarea { width: 100%; min-height: 44px; border: 1px solid #cdd9e5; border-radius: 6px; padding: 10px 12px; outline: 0; }
.field textarea { min-height: 96px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--brand); box-shadow: 0 0 0 4px rgba(47,128,193,.12); }
.error { margin-top: 7px; color: #b42318; font-size: 14px; }
.page-error { margin-bottom: 18px; padding: 12px 14px; border: 1px solid #f2b8b5; border-radius: 8px; background: #fff5f5; }
.mini-items { display: grid; gap: 12px; }
.mini-item { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 10px; color: #334155; line-height: 1.5; }
.success-card { max-width: 720px; margin: 0 auto; padding: 34px; text-align: center; }
.success-card h1 { margin: 0 0 10px; font-size: 30px; }
.success-card .primary-button + .primary-button,
.success-card .primary-button + .secondary-button,
.success-card .secondary-button + .primary-button,
.success-card .secondary-button + .secondary-button { margin-top: 12px; }
.order-no { display: inline-flex; align-items: center; min-height: 42px; margin: 16px 0; padding: 0 18px; border-radius: 999px; background: #eef6fc; color: var(--brand-dark); font-weight: 900; }
.coupon-picker { display: grid; gap: 12px; padding: 18px; border: 1px solid #dbe7f1; border-radius: 8px; background: #f8fbfd; }
.coupon-head { display: flex; justify-content: space-between; gap: 12px; align-items: flex-start; }
.coupon-head h2 { margin: 0 0 6px; font-size: 18px; }
.coupon-head p, .coupon-empty { margin: 0; color: var(--muted); line-height: 1.6; }
.coupon-clear { min-height: 34px; padding: 0 12px; border: 1px solid var(--line); border-radius: 999px; background: #fff; color: var(--brand-dark); font-weight: 900; cursor: pointer; white-space: nowrap; }
.coupon-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.coupon-chip { display: grid; gap: 4px; min-height: 94px; padding: 12px; border: 1px solid #cdd9e5; border-radius: 8px; background: #fff; color: var(--ink); text-align: left; cursor: pointer; }
.coupon-chip strong { color: var(--brand-dark); }
.coupon-chip span { color: #2f80c1; font-weight: 900; }
.coupon-chip small { color: var(--muted); font-weight: 800; }
.field.is-muted input { background: #f8fafc; }
.tracking-preview { display: grid; gap: 8px; margin: 20px 0; padding: 16px; border: 1px solid #dbe7f1; border-radius: 8px; background: #f8fbfd; text-align: left; }
.tracking-preview a { color: var(--brand-dark); font-weight: 900; text-decoration: underline; }
@media (max-width: 1080px) {
    .cart-layout { grid-template-columns: 1fr; }
    .cart-item { grid-template-columns: 96px minmax(0, 1fr) 120px 160px; }
    .summary { position: static; }
    .cart-recommendation-grid { grid-auto-columns: minmax(200px, 230px); }
}
@media (max-width: 860px) {
    .checkout-header { padding: 0 16px; align-items: flex-start; flex-direction: column; justify-content: center; min-height: 92px; }
    .checkout-nav { overflow-x: auto; max-width: 100%; }
    .cart-layout, .checkout-layout { grid-template-columns: 1fr; }
    .page-title-row { display: grid; gap: 14px; }
    .back-button { justify-self: start; }
    .cart-item { grid-template-columns: 82px minmax(0, 1fr); }
    .cart-price, .cart-total, .cart-controls { grid-column: 2; }
    .quantity-form { grid-template-columns: 58px 36px 36px; gap: 6px; justify-content: start; }
    .quantity-form input { width: 58px; }
    .quantity-step-button { width: 36px; }
    .summary { position: static; }
    .form-grid { grid-template-columns: 1fr; }
    .coupon-list { grid-template-columns: 1fr; }
    .content-page-actions { grid-template-columns: 1fr; }
    .cart-recommendations { padding: 16px; }
    .cart-recommendations-head { align-items: flex-start; flex-direction: column; }
    .cart-recommendation-shell { grid-template-columns: minmax(0, 1fr); }
    .cart-recommendation-arrow { display: none; }
    .cart-recommendation-grid { grid-auto-columns: minmax(250px, 82vw); padding-bottom: 10px; }
    .cart-recommendation-card { grid-template-columns: 112px minmax(0, 1fr); }
    .cart-recommendation-image { aspect-ratio: 1 / 1; }
}