:root { color-scheme: light; font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif; color: #18382d; background: #fff; }
* { box-sizing: border-box; }
body { margin: 0; line-height: 1.6; }
a { color: inherit; }
a:focus-visible { outline: 2px solid #245e46; outline-offset: 4px; }
.shell { width: min(100% - 48px, 1280px); margin-inline: auto; }
.site-header { background: #fff; border-bottom: 1px solid #dfe9df; position: sticky; top: 0; z-index: 50; }
.site-header .shell { display: flex; align-items: center; justify-content: space-between; gap: 28px; min-height: 84px; }
.brand { display: inline-flex; min-height: 44px; align-items: center; font-family: Georgia, "Noto Serif SC", serif; font-size: 24px; text-decoration: none; white-space: nowrap; font-weight: 700; color: #18382d; }
.site-nav { display: flex; flex-wrap: wrap; gap: 28px; align-items: center; }
.site-nav a { display: inline-flex; min-height: 44px; align-items: center; font-size: 14px; text-decoration: none; color: #18382d; }
.site-nav a:hover, .back:hover { text-decoration: underline; text-underline-offset: 5px; }
.product-page { padding: 46px 0 90px; }
.back { display: inline-flex; min-height: 44px; align-items: center; margin-bottom: 24px; color: #355444; font-size: 14px; text-decoration: none; }
.product-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: start; gap: clamp(36px, 6vw, 92px); }
.product-image { display: grid; place-items: center; width: 100%; aspect-ratio: 1; padding: 6%; border: 1px solid #e1e9df; background: #f7f9f6; border-radius: 4px; }
.product-image img { display: block; width: 100%; height: 100%; object-fit: contain; }
.product-info .category { margin: 0 0 12px; color: #527b62; font-size: 14px; }
.product-info h1 { margin: 0 0 16px; font-family: Georgia, "Noto Serif SC", serif; font-size: clamp(28px, 4vw, 44px); font-weight: 500; line-height: 1.25; }
.product-info .sku-tag { display: inline-block; font-size: 12px; color: #62826e; background: #eaf2e8; padding: 3px 8px; border-radius: 3px; margin-bottom: 16px; width: fit-content; }
.product-info .brief { margin: 0 0 20px; font-size: 15px; color: #3d5e4d; line-height: 1.6; }
.price-box { display: flex; align-items: baseline; gap: 12px; margin: 0 0 28px; }
.price { margin: 0; font-size: 28px; font-weight: 700; color: #18382d; font-variant-numeric: tabular-nums; }
.original-price { font-size: 16px; color: #889e90; text-decoration: line-through; }
.facts { border-top: 1px solid #d9e5d9; margin-top: 24px; }
.facts h2 { margin: 28px 0 14px; font-size: 18px; color: #18382d; }
.facts dl { margin: 0; }
.facts .row { display: grid; grid-template-columns: 110px minmax(0, 1fr); gap: 18px; padding: 14px 0; border-bottom: 1px solid #e2eae1; font-size: 14.5px; line-height: 1.6; }
.facts dt { color: #54735d; font-weight: 500; }
.facts dd { margin: 0; overflow-wrap: anywhere; color: #224235; }
.site-footer { padding: 54px 0 66px; background: #e8f0e7; border-top: 1px solid #d5e2d4; }
.footer-grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr 1fr; gap: 32px; }
.site-footer h2 { margin: 0 0 18px; font-size: 15px; color: #18382d; }
.site-footer p { margin: 0 0 8px; color: #355444; font-size: 14px; line-height: 1.7; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 8px; }
.site-footer .footer-brand { font-family: Georgia, "Noto Serif SC", serif; font-size: 24px; font-weight: 700; margin-bottom: 12px; }
.site-footer a { display: inline-flex; min-height: 36px; align-items: center; color: #2d4f3e; text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }
.copyright { border-top: 1px solid #d5e2d4; margin-top: 40px; padding-top: 20px; font-size: 13px; color: #62826e; text-align: center; }
@media (max-width: 900px) {
  .site-header .shell { align-items: flex-start; flex-direction: column; justify-content: center; padding-block: 18px; }
  .product-layout { grid-template-columns: 1fr; gap: 32px; }
  .product-image { max-width: 600px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
}
@media (max-width: 600px) {
  .shell { width: min(100% - 32px, 1280px); }
  .site-header .shell { gap: 14px; }
  .brand { font-size: 20px; }
  .site-nav { gap: 12px 20px; }
  .product-page { padding: 24px 0 60px; }
  .back { margin-bottom: 18px; }
  .product-info h1 { font-size: 28px; }
  .price { margin-bottom: 20px; font-size: 24px; }
  .facts .row { grid-template-columns: 1fr; gap: 4px; padding: 10px 0; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
}