html { scroll-behavior: smooth; }
body { margin: 0; background: #fff; color: #25322b; font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif; letter-spacing: 0; }
*, *::before, *::after { box-sizing: border-box; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid #0056b3; outline-offset: 4px; }
section[id] { scroll-margin-top: 110px; }
.skip-link { position: fixed; top: -100px; left: 16px; z-index: 90; background: #0056b3; color: #fff; padding: 12px; }
.skip-link:focus { top: 12px; }
.product-container { width: min(100% - 48px, 1184px); margin-inline: auto; }
.breadcrumb { padding-block: 24px; color: #67736b; font-size: 13px; }
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: 10px; }
.breadcrumb li:not(:last-child)::after { content: '/'; margin-left: 10px; color: #a3ada6; }
.breadcrumb a:hover { color: #0056b3; }
.product-overview { display: grid; gap: 32px; padding-block: 12px 64px; }
.product-gallery { min-width: 0; }
.product-image-stage { aspect-ratio: 4 / 3; background: #fff; border: 1px solid #e3e8e4; border-radius: 6px; overflow: hidden; }
#main-product-image { width: 100%; height: 100%; object-fit: contain; }
#main-product-image.is-entering { animation: product-reveal 180ms ease; }
@keyframes product-reveal { from { opacity: .45; } to { opacity: 1; } }
#gallery-caption { min-height: 42px; padding-block: 10px; font-size: 12px; color: #607167; }
.product-thumbnails { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.product-thumbnails button { min-width: 0; display: flex; flex-direction: column; padding: 6px; border: 1px solid #dce4df; border-radius: 6px; background: #fff; cursor: pointer; text-align: left; }
.product-thumbnails img { width: 100%; aspect-ratio: 4 / 3; object-fit: contain; }
.product-thumbnails span { display: flex; align-items: center; min-height: 42px; padding-top: 6px; font-size: 11px; line-height: 1.5; color: #526259; }
.product-thumbnails button[aria-pressed="true"] { border-color: #0056b3; box-shadow: inset 0 0 0 1px #0056b3; }
.product-thumbnails button:hover { border-color: #28a745; }
.gallery-note, .gallery-error { margin-top: 16px; font-size: 12px; line-height: 1.8; color: #738077; }
.gallery-error { min-height: 22px; color: #9c2e2e; margin-top: 4px; }
.product-eyebrow { font-size: 13px; font-weight: 600; color: #267b41; }
.product-summary-panel h1 { margin: 14px 0 18px; font-size: 34px; font-weight: 700; line-height: 1.3; }
.product-intro { font-size: 15px; line-height: 1.9; color: #56655c; }
.product-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.product-tags li { padding: 5px 9px; background: #eef5f0; color: #267b41; font-size: 12px; border-radius: 4px; }
.product-specs { margin-top: 26px; }
.product-specs > div { display: grid; grid-template-columns: 76px 1fr; gap: 12px; padding: 14px 0; border-bottom: 1px solid #e7ece9; font-size: 13px; line-height: 1.8; }
.product-specs dt { color: #6b7a70; }
.product-specs dd { min-width: 0; }
.product-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.product-phone { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 12px 22px; border: 1px solid #91a39a; border-radius: 6px; font-size: 14px; font-weight: 600; }
.product-phone:hover { color: #0056b3; border-color: #0056b3; }
.product-contact-note { margin-top: 12px; font-size: 12px; color: #738077; line-height: 1.8; }
.product-details-band { background: #f5f7f5; }
.product-details-layout { display: grid; gap: 40px; padding-block: 56px; }
.product-content section + section { margin-top: 36px; border-top: 1px solid #dce4de; padding-top: 36px; }
.product-content h2, .product-quote h2 { font-size: 26px; font-weight: 650; line-height: 1.5; margin: 12px 0 18px; }
.product-content ul { padding-left: 20px; list-style: disc; }
.product-content li { color: #526259; font-size: 15px; line-height: 1.9; margin-bottom: 10px; }
.quality-note { font-size: 13px; line-height: 1.8; color: #738077; }
.product-selection { border-left: 2px solid #28a745; padding-left: 24px; align-self: start; }
.product-selection h2 { font-size: 18px; font-weight: 650; }
.product-selection ol { list-style: decimal; padding-left: 20px; margin: 22px 0; line-height: 2.1; font-size: 14px; color: #526259; }
.product-selection > a { font-size: 23px; color: #0056b3; font-weight: 650; }
.product-selection > p { font-size: 13px; line-height: 1.9; color: #738077; margin-top: 14px; }
.product-quote { padding-block: 44px; border-bottom: 1px solid #e3e8e4; }
.product-quote-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 24px; }
.product-quote p:last-child { color: #637368; font-size: 14px; line-height: 1.8; }
.related-products { padding-block: 40px 56px; }
.related-products h2 { font-size: 18px; font-weight: 650; margin-bottom: 20px; }
.related-products > div { display: flex; flex-wrap: wrap; gap: 12px 26px; }
.related-products a { display: inline-flex; align-items: center; min-height: 44px; gap: 12px; color: #0056b3; font-size: 14px; }
@media (min-width: 1024px) {
  .product-overview { grid-template-columns: 1.08fr 1fr; gap: 56px; }
  .product-summary-panel h1 { font-size: 40px; }
  .product-gallery { position: sticky; top: 112px; align-self: start; }
  .product-details-layout { grid-template-columns: 1.6fr 1fr; gap: 80px; padding-block: 72px; }
}
@media (max-width: 359px) { .product-container { width: calc(100% - 32px); } .product-summary-panel h1 { font-size: 30px; } }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } #main-product-image.is-entering { animation: none; } }