:root {
    --product-ink: #132238;
    --product-muted: #526275;
    --product-border: #dce5f0;
    --product-surface: #f5f8fc;
    --product-accent: #1557c0;
    --product-accent-dark: #0f3f96;
    --product-warm: #b48612;
    --product-white: #ffffff;
}

.product-page {
    margin: 0;
    color: var(--product-ink);
    background: #f7f9fc;
    font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
    line-height: 1.65;
}

.product-page a { color: inherit; }
.product-shell { padding-bottom: 96px; }
.product-hero { display: flex; justify-content: space-between; align-items: end; gap: 32px; padding: 58px 0 42px; border-bottom: 1px solid var(--product-border); }
.product-eyebrow { margin: 0 0 8px; color: var(--product-warm); font-size: 12px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase; }
.product-hero h1, .product-detail h1 { margin: 0; font-size: clamp(30px, 4vw, 48px); line-height: 1.2; }
.product-hero p { max-width: 620px; margin: 14px 0 0; color: var(--product-muted); }
.product-hero__count { display: grid; gap: 2px; min-width: 110px; padding-left: 20px; border-left: 3px solid var(--product-accent); }
.product-hero__count strong { font-size: 30px; line-height: 1; }
.product-hero__count span { color: var(--product-muted); font-size: 13px; }
.product-layout { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 48px; padding: 44px 0 20px; }
.product-filter { align-self: start; position: sticky; top: 20px; }
.product-filter__heading { padding-bottom: 12px; border-bottom: 2px solid var(--product-ink); font-size: 14px; font-weight: 700; }
.product-filter__tree, .product-filter__tree ul { margin: 12px 0 0; padding: 0; list-style: none; }
.product-filter__tree ul { margin: 0 0 0 12px; }
.product-filter__item a { display: block; padding: 6px 10px 6px calc(10px + var(--category-depth, 0) * 12px); color: var(--product-muted); font-size: 14px; text-decoration: none; border-left: 2px solid transparent; }
.product-filter__item a:hover, .product-filter__item.is-active > a { color: var(--product-accent-dark); border-left-color: var(--product-accent); background: #edf4ff; }
.product-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.product-card { overflow: hidden; border: 1px solid var(--product-border); border-radius: 2px; background: var(--product-white); box-shadow: 0 12px 28px rgba(19, 34, 56, .05); transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease; }
.product-card:hover { border-color: #a9bfd8; transform: translateY(-4px); box-shadow: 0 18px 34px rgba(19, 34, 56, .1); }
.product-card__media, .product-detail__media { display: grid; place-items: center; overflow: hidden; background: var(--product-surface); }
.product-card__media { position: relative; aspect-ratio: 4 / 3; }
.product-card__media picture, .product-detail__media picture { width: 100%; height: 100%; }
.product-card__media img, .product-detail__media img { width: 100%; height: 100%; object-fit: cover; }
.product-media-placeholder { display: grid; width: 100%; height: 100%; place-items: center; color: #8797a8; font-size: 13px; font-weight: 700; }
.product-card__body { padding: 18px; }
.product-card__category, .product-card__brand { margin: 0; color: var(--product-muted); font-size: 12px; }
.product-card h2 { margin: 5px 0 8px; font-size: 19px; line-height: 1.35; }
.product-card h2 a { text-decoration: none; }
.product-card__summary { min-height: 48px; margin: 8px 0 14px; color: var(--product-muted); font-size: 13px; }
.product-card__link { color: var(--product-accent-dark); font-size: 13px; font-weight: 700; text-decoration: none; }
.product-empty { padding: 64px 0; text-align: center; border-top: 1px solid var(--product-border); }
.product-empty h2 { margin: 0 0 8px; font-size: 24px; }
.product-empty p { margin: 0 0 20px; color: var(--product-muted); }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 18px; border-radius: 4px; font-size: 14px; font-weight: 700; text-decoration: none; }
.button--primary { color: var(--product-white) !important; background: var(--product-accent); }
.button--primary:hover, .button--primary:focus-visible { background: var(--product-accent-dark); }
.pagination { display: flex; justify-content: center; align-items: center; gap: 18px; margin-top: 36px; color: var(--product-muted); font-size: 13px; }
.pagination a, .pagination span { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 12px; }
.pagination a { color: var(--product-accent-dark); font-weight: 700; text-decoration: none; }
.breadcrumb { display: flex; flex-wrap: wrap; gap: 8px; padding: 28px 0; color: var(--product-muted); font-size: 13px; }
.breadcrumb a { color: var(--product-accent-dark); text-decoration: none; }
.product-detail { display: grid; grid-template-columns: minmax(300px, 1fr) minmax(0, 1fr); gap: 56px; padding: 20px 0 72px; }
.product-detail__media { position: relative; aspect-ratio: 1 / 1; border: 1px solid var(--product-border); border-radius: 2px; box-shadow: 0 16px 32px rgba(19, 34, 56, .08); }
.product-detail__content { align-self: center; }
.product-detail__summary { margin: 20px 0; color: var(--product-muted); font-size: 17px; }
.product-detail__facts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin: 24px 0; padding: 18px 0; border-top: 1px solid var(--product-border); border-bottom: 1px solid var(--product-border); }
.product-detail__facts div { display: grid; gap: 4px; }
.product-detail__facts dt { color: var(--product-muted); font-size: 12px; }
.product-detail__facts dd { margin: 0; font-weight: 700; }
.product-tags, .oem-options { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 26px; padding: 0; list-style: none; }
.product-tags li, .oem-options li { padding: 4px 9px; border: 1px solid var(--product-border); border-radius: 3px; color: var(--product-muted); font-size: 12px; }
.product-detail__body { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(240px, .6fr); gap: 48px; padding: 34px 0 90px; border-top: 1px solid var(--product-border); }
.product-detail__body h2 { margin: 0 0 14px; font-size: 22px; }
.rich-text { color: #334e68; overflow-wrap: anywhere; }
.rich-text img { max-width: 100%; height: auto; }
.rich-text table { display: block; max-width: 100%; overflow-x: auto; }
.oem-options { display: grid; align-content: start; }
@media (max-width: 900px) { .product-layout { grid-template-columns: 180px minmax(0, 1fr); gap: 28px; } .product-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } .product-detail { gap: 32px; } }
@media (max-width: 680px) { .product-hero { display: block; padding: 42px 0 30px; } .product-hero__count { width: fit-content; margin-top: 24px; } .product-layout { display: block; padding-top: 24px; } .product-filter { position: static; margin-bottom: 28px; } .product-filter__tree { display: flex; flex-wrap: wrap; gap: 4px; } .product-filter__tree ul { display: contents; } .product-filter__item a { display: flex; align-items: center; min-height: 44px; padding: 0 10px; border: 1px solid var(--product-border); border-radius: 3px; } .product-grid { grid-template-columns: 1fr; } .pagination { flex-wrap: wrap; gap: 8px; } .product-detail, .product-detail__body { grid-template-columns: 1fr; gap: 30px; } .product-detail { padding-bottom: 42px; } .product-detail__body { padding-bottom: 60px; } }