:root {
  --ink: #173033;
  --ink-soft: #315054;
  --muted: #68797a;
  --line: #dce5e2;
  --line-strong: #becdca;
  --paper: #f7faf8;
  --white: #ffffff;
  --green: #0c7b70;
  --green-dark: #085e57;
  --aqua: #dcefeb;
  --sky: #dcecf3;
  --yellow: #f1cb65;
  --yellow-soft: #fff7dc;
  --coral: #d96d55;
  --coral-soft: #f8e6df;
  --radius: 8px;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--paper);
}

* { box-sizing: border-box; }
html { min-width: 320px; scroll-behavior: smooth; }
body { margin: 0; min-height: 100vh; background: var(--paper); }
body.dialog-open { overflow: hidden; }
button, input, select, textarea { font: inherit; letter-spacing: 0; }
button, a { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
svg { flex: 0 0 auto; }
:focus-visible { outline: 3px solid rgba(12, 123, 112, .28); outline-offset: 3px; }

.site-header,
.admin-header {
  height: 68px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, .96);
}
.site-header { position: sticky; top: 0; z-index: 40; }
.site-header-inner {
  width: min(1240px, calc(100% - 48px));
  height: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.admin-header {
  padding: 0 max(24px, calc((100vw - 1240px) / 2));
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 17px; font-weight: 800; }
.brand-mark {
  width: 36px;
  height: 36px;
  flex: 0 0 36px;
  display: grid;
  place-items: center;
  overflow: hidden;
  border-radius: 6px;
  color: var(--white);
  background: var(--green);
  font-size: 12px;
}
.brand-mark svg { width: 21px; height: 21px; }
.brand-wordmark { display: grid; line-height: 1.05; }
.brand-wordmark strong { font-size: 18px; }
.brand-wordmark small { margin-top: 4px; color: var(--muted); font-size: 8px; font-weight: 700; letter-spacing: 0; }
.site-nav { display: flex; align-items: center; gap: 30px; color: var(--ink-soft); font-size: 14px; font-weight: 650; }
.site-nav a { padding: 10px 0; }
.site-nav a:hover { color: var(--green); }

.primary-button,
.secondary-button {
  min-height: 40px;
  padding: 0 15px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 750;
  line-height: 1.2;
}
.primary-button { color: var(--white); border: 1px solid var(--green); background: var(--green); }
.primary-button:hover { border-color: var(--green-dark); background: var(--green-dark); }
.secondary-button { color: var(--ink); border: 1px solid var(--line-strong); background: var(--white); }
.secondary-button:hover { border-color: var(--green); color: var(--green-dark); }
.primary-button svg, .secondary-button svg { width: 17px; height: 17px; }
.large-button { min-height: 48px; padding: 0 20px; font-size: 14px; }
.compact-button { min-height: 36px; padding: 0 11px; }
.icon-button {
  width: 38px;
  height: 38px;
  padding: 0;
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink-soft);
  background: var(--white);
}
.icon-button:hover { color: var(--ink); border-color: var(--line-strong); }
.icon-button svg { width: 18px; height: 18px; }
.eyebrow { margin: 0 0 9px; color: var(--green); font-size: 11px; font-weight: 850; letter-spacing: 0; }

.home-hero {
  width: min(1240px, calc(100% - 48px));
  min-height: 500px;
  margin: 0 auto;
  padding: 58px 0 54px;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(400px, .95fr);
  align-items: center;
  gap: 76px;
}
.hero-copy { max-width: 640px; }
.hero-copy h1 { margin: 0; font-size: 62px; line-height: 1.05; letter-spacing: 0; }
.hero-tagline { margin: 14px 0 0; color: var(--coral); font-size: 25px; line-height: 1.4; font-weight: 800; }
.hero-description { max-width: 600px; margin: 18px 0 0; color: var(--ink-soft); font-size: 16px; line-height: 1.85; }
.hero-actions { margin-top: 28px; display: flex; flex-wrap: wrap; gap: 10px; }
.hero-purchase-note { margin: 15px 0 0; display: flex; align-items: center; gap: 7px; color: var(--muted); font-size: 12px; }
.hero-purchase-note svg { width: 15px; height: 15px; }
.hero-products { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.hero-product {
  min-width: 0;
  min-height: 194px;
  padding: 22px 20px 17px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 17px;
  overflow: hidden;
  border: 1px solid rgba(23, 48, 51, .08);
  border-radius: 8px;
  background: var(--white);
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}
.hero-product:hover { transform: translateY(-3px); border-color: var(--line-strong); box-shadow: 0 14px 32px rgba(23, 48, 51, .09); }
.hero-product-image { width: 100%; flex: 1; display: grid; place-items: center; background: transparent; }
.hero-product-image img { width: 76px; height: 76px; object-fit: contain; }
.hero-product-image img[src^="/media/"] { width: 100%; height: 100%; max-height: 108px; object-fit: cover; border-radius: 5px; }
.hero-product > span { min-width: 0; overflow: hidden; color: var(--ink-soft); font-size: 13px; font-weight: 750; text-overflow: ellipsis; white-space: nowrap; }
.hero-product-1 { background: var(--aqua); }
.hero-product-2 { background: var(--coral-soft); }
.hero-product-3 { background: var(--sky); }
.hero-product-4 { background: var(--yellow-soft); }
.hero-empty-mark { grid-column: 1 / -1; min-height: 340px; display: grid; place-items: center; align-content: center; gap: 16px; border: 1px solid var(--line); border-radius: 8px; color: var(--muted); background: var(--aqua); }
.hero-empty-mark svg { width: 62px; height: 62px; color: var(--green); }

.trust-strip {
  padding: 0 max(24px, calc((100vw - 1240px) / 2));
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  color: var(--white);
  background: #21484a;
}
.trust-strip > div { min-height: 108px; padding: 24px 22px; display: flex; align-items: center; gap: 14px; border-right: 1px solid rgba(255, 255, 255, .15); }
.trust-strip > div:first-child { padding-left: 0; }
.trust-strip > div:last-child { padding-right: 0; border-right: 0; }
.trust-strip svg { width: 22px; height: 22px; color: var(--yellow); }
.trust-strip p { margin: 0; display: grid; gap: 4px; }
.trust-strip strong { font-size: 14px; }
.trust-strip span { color: #bdd0ce; font-size: 12px; line-height: 1.45; }

.catalog-section,
.purchase-section,
.faq-section,
.product-page-shell {
  width: min(1240px, calc(100% - 48px));
  margin: 0 auto;
}
.catalog-section { padding: 78px 0 90px; scroll-margin-top: 80px; }
.section-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 28px; }
.section-heading h2 { margin: 0; font-size: 32px; line-height: 1.25; letter-spacing: 0; }
.catalog-meta { margin: 0 0 4px; color: var(--muted); font-size: 13px; }
.catalog-meta strong { color: var(--ink); font-size: 18px; }
.category-filter { margin: 30px 0 22px; padding-bottom: 2px; display: flex; align-items: center; gap: 7px; overflow-x: auto; scrollbar-width: none; }
.category-filter::-webkit-scrollbar { display: none; }
.filter-button {
  min-height: 40px;
  padding: 0 16px;
  flex: 0 0 auto;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink-soft);
  background: var(--white);
  font-size: 13px;
  font-weight: 700;
}
.filter-button:hover { border-color: var(--line-strong); }
.filter-button.active { color: var(--white); border-color: var(--ink); background: var(--ink); }
.product-grid, .related-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 17px; }
.product-card {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}
.product-card:hover { transform: translateY(-3px); border-color: var(--line-strong); box-shadow: 0 14px 30px rgba(23, 48, 51, .08); }
.product-card[hidden] { display: none; }
.product-card-link { height: 100%; display: flex; flex-direction: column; }
.product-visual { position: relative; aspect-ratio: 16 / 10; display: grid; place-items: center; overflow: hidden; background: #edf3f1; }
.product-visual img { width: 31%; height: 31%; min-width: 58px; min-height: 58px; max-width: 88px; max-height: 88px; object-fit: contain; }
.product-visual img[src^="/media/"] { width: 100%; height: 100%; max-width: none; max-height: none; object-fit: cover; }
.visual-chatgpt { background: var(--aqua); }
.visual-claude { background: var(--coral-soft); }
.visual-gemini { background: var(--sky); }
.visual-grok { background: #e8e8e4; }
.visual-label { position: absolute; left: 12px; top: 12px; padding: 5px 8px; border-radius: 4px; color: var(--ink-soft); background: rgba(255, 255, 255, .88); font-size: 10px; font-weight: 800; }
.product-info { min-height: 190px; padding: 18px; display: flex; flex: 1; flex-direction: column; justify-content: space-between; gap: 20px; }
.product-info h3 { margin: 0; font-size: 16px; line-height: 1.45; letter-spacing: 0; overflow-wrap: anywhere; }
.product-summary { min-height: 42px; margin: 8px 0 0; display: -webkit-box; overflow: hidden; color: var(--muted); font-size: 12px; line-height: 1.7; -webkit-box-orient: vertical; -webkit-line-clamp: 2; }
.product-card-footer { display: flex; align-items: flex-end; justify-content: space-between; gap: 10px; }
.product-price { margin: 0; color: var(--green-dark); font-size: 25px; line-height: 1; font-weight: 850; font-variant-numeric: tabular-nums; }
.currency { margin-right: 2px; font-size: 14px; vertical-align: 4px; }
.price-suffix { margin-left: 4px; color: var(--muted); font-size: 11px; font-weight: 650; }
.detail-link, .text-link { display: inline-flex; align-items: center; gap: 4px; color: var(--ink-soft); font-size: 12px; font-weight: 750; white-space: nowrap; }
.detail-link svg, .text-link svg { width: 15px; height: 15px; }
.product-card:hover .detail-link, .text-link:hover { color: var(--green); }
.empty-state { padding: 80px 0 20px; display: grid; justify-items: center; gap: 10px; color: var(--muted); }
.empty-state[hidden] { display: none; }
.empty-state svg { width: 36px; height: 36px; }
.empty-state p { margin: 0; }

.purchase-section { width: 100%; max-width: none; padding: 76px max(24px, calc((100vw - 1240px) / 2)) 72px; border-top: 1px solid #eadcae; border-bottom: 1px solid #eadcae; background: var(--yellow-soft); scroll-margin-top: 80px; }
.purchase-heading > p { max-width: 400px; margin: 0 0 3px; color: var(--ink-soft); font-size: 14px; line-height: 1.7; text-align: right; }
.purchase-steps { margin: 38px 0 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); list-style: none; }
.purchase-steps li { position: relative; min-height: 190px; padding: 2px 30px 0; border-left: 1px solid #ded09f; }
.purchase-steps li:first-child { padding-left: 0; border-left: 0; }
.purchase-steps li:last-child { padding-right: 0; }
.purchase-steps li > span { position: absolute; right: 18px; top: 0; color: #c7aa53; font-size: 12px; font-weight: 850; }
.purchase-steps li > svg { width: 28px; height: 28px; color: var(--coral); }
.purchase-steps h3 { margin: 22px 0 8px; font-size: 17px; }
.purchase-steps p { max-width: 230px; margin: 0; color: var(--ink-soft); font-size: 13px; line-height: 1.75; }
.purchase-contact { margin-top: 28px; }

.faq-section { padding: 88px 0 98px; display: grid; grid-template-columns: minmax(250px, .72fr) minmax(0, 1.28fr); gap: 90px; scroll-margin-top: 80px; }
.faq-intro h2 { margin: 0; font-size: 32px; letter-spacing: 0; }
.faq-intro > p:last-child { margin: 18px 0 0; color: var(--ink-soft); font-size: 14px; line-height: 1.85; }
.faq-list { border-top: 1px solid var(--line-strong); }
.faq-list details { border-bottom: 1px solid var(--line-strong); }
.faq-list summary { min-height: 68px; padding: 18px 0; display: flex; align-items: center; justify-content: space-between; gap: 20px; cursor: pointer; font-size: 15px; font-weight: 750; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary svg { width: 18px; height: 18px; transition: transform .18s ease; }
.faq-list details[open] summary svg { transform: rotate(45deg); }
.faq-list details p { margin: -3px 40px 20px 0; color: var(--ink-soft); font-size: 13px; line-height: 1.8; }

.site-footer { padding: 42px max(24px, calc((100vw - 1240px) / 2)) 30px; color: var(--white); background: #173033; }
.footer-main { display: grid; grid-template-columns: 1fr 1.4fr auto; align-items: center; gap: 32px; }
.footer-brand .brand-mark { color: var(--ink); background: var(--yellow); }
.footer-main p { margin: 0; color: #c7d6d4; font-size: 14px; }
.footer-wechat { min-height: 40px; padding: 0 4px; display: inline-flex; align-items: center; gap: 6px; border: 0; color: var(--white); background: transparent; font-size: 13px; font-weight: 750; }
.footer-wechat svg { width: 16px; height: 16px; }
.footer-meta { margin-top: 30px; padding-top: 20px; display: flex; justify-content: space-between; gap: 20px; border-top: 1px solid rgba(255, 255, 255, .14); color: #91aaa7; font-size: 11px; }

.wechat-dialog { width: min(720px, calc(100% - 32px)); max-height: calc(100vh - 32px); padding: 26px; overflow: auto; border: 1px solid var(--line-strong); border-radius: 8px; color: var(--ink); background: var(--white); box-shadow: 0 24px 70px rgba(17, 43, 44, .26); }
.wechat-dialog::backdrop { background: rgba(12, 29, 30, .62); }
.wechat-dialog-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; }
.wechat-dialog-heading h2 { margin: 0; font-size: 24px; letter-spacing: 0; }
.wechat-dialog-lead { max-width: 590px; margin: 13px 0 22px; color: var(--ink-soft); font-size: 13px; line-height: 1.75; }
.wechat-dialog-body { display: grid; grid-template-columns: 230px minmax(0, 1fr); gap: 24px; }
.wechat-dialog-body.no-qr { grid-template-columns: 1fr; }
.wechat-qr { margin: 0; padding: 12px; border: 1px solid var(--line); border-radius: 7px; background: var(--paper); }
.wechat-qr img { width: 100%; aspect-ratio: 1; object-fit: contain; background: var(--white); }
.wechat-qr figcaption { margin-top: 10px; color: var(--muted); font-size: 11px; text-align: center; }
.wechat-contact-details { min-width: 0; }
.field-label { display: block; margin: 2px 0 7px; color: var(--muted); font-size: 11px; font-weight: 750; }
.copy-field { min-height: 46px; margin-bottom: 17px; padding: 5px 5px 5px 13px; display: flex; align-items: center; justify-content: space-between; gap: 12px; border: 1px solid var(--line); border-radius: 6px; background: var(--paper); }
.copy-field strong { min-width: 0; overflow: hidden; font-size: 17px; text-overflow: ellipsis; }
.inquiry-copy { min-height: 70px; padding: 10px 8px 10px 12px; display: flex; align-items: center; justify-content: space-between; gap: 10px; border: 1px solid var(--line); border-radius: 6px; }
.inquiry-copy p { margin: 0; color: var(--ink-soft); font-size: 12px; line-height: 1.65; }
.inquiry-copy .icon-button { flex: 0 0 36px; width: 36px; height: 36px; }
.wechat-facts { margin: 17px 0 0; display: grid; gap: 9px; }
.wechat-facts div { display: grid; grid-template-columns: 66px 1fr; gap: 10px; font-size: 11px; line-height: 1.5; }
.wechat-facts dt { color: var(--muted); }
.wechat-facts dd { margin: 0; color: var(--ink-soft); }
.dialog-notice { margin: 22px 0 0; padding: 11px 13px; border-left: 3px solid var(--yellow); color: var(--ink-soft); background: var(--yellow-soft); font-size: 11px; line-height: 1.65; }
.clipboard-toast { position: fixed; left: 50%; bottom: 30px; z-index: 90; max-width: calc(100% - 32px); padding: 10px 14px; border-radius: 6px; color: var(--white); background: var(--ink); box-shadow: 0 8px 25px rgba(17, 43, 44, .2); font-size: 12px; opacity: 0; transform: translate(-50%, 8px); pointer-events: none; transition: opacity .16s ease, transform .16s ease; }
.clipboard-toast.show { opacity: 1; transform: translate(-50%, 0); }
.mobile-purchase-bar { display: none; }

.product-page-shell { padding: 26px 0 90px; }
.breadcrumb { min-width: 0; display: flex; align-items: center; gap: 6px; overflow: hidden; color: var(--muted); font-size: 12px; }
.breadcrumb a:hover { color: var(--green); }
.breadcrumb svg { width: 14px; height: 14px; }
.breadcrumb span { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.product-hero { padding: 38px 0 54px; display: grid; grid-template-columns: minmax(360px, .9fr) minmax(0, 1.1fr); align-items: center; gap: 74px; }
.product-detail-visual { position: relative; aspect-ratio: 4 / 3; display: grid; place-items: center; overflow: hidden; border: 1px solid var(--line); border-radius: 8px; }
.product-detail-visual img { width: 25%; height: 25%; min-width: 100px; min-height: 100px; max-width: 150px; max-height: 150px; object-fit: contain; }
.product-detail-visual img[src^="/media/"] { width: 100%; height: 100%; max-width: none; max-height: none; object-fit: cover; }
.product-hero-copy h1 { max-width: 650px; margin: 0; font-size: 42px; line-height: 1.25; letter-spacing: 0; overflow-wrap: anywhere; }
.product-detail-summary { max-width: 650px; margin: 16px 0 0; color: var(--ink-soft); font-size: 15px; line-height: 1.8; }
.product-detail-price { margin: 25px 0 0; color: var(--green-dark); font-size: 38px; line-height: 1; font-weight: 850; }
.product-detail-price > span { margin-right: 3px; font-size: 18px; vertical-align: 7px; }
.product-detail-price small { margin-left: 6px; color: var(--muted); font-size: 13px; font-weight: 650; }
.product-hero-actions { margin-top: 28px; display: flex; flex-wrap: wrap; gap: 10px; }
.product-purchase-hint { margin: 15px 0 0; display: flex; align-items: center; gap: 7px; color: var(--muted); font-size: 12px; }
.product-purchase-hint svg { width: 16px; height: 16px; color: var(--green); }
.product-quick-facts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.product-quick-facts > div { min-height: 94px; padding: 20px 26px; display: grid; grid-template-columns: 24px 1fr; grid-template-rows: auto auto; column-gap: 12px; border-right: 1px solid var(--line); }
.product-quick-facts > div:first-child { padding-left: 0; }
.product-quick-facts > div:last-child { padding-right: 0; border-right: 0; }
.product-quick-facts svg { width: 21px; height: 21px; grid-row: 1 / 3; align-self: center; color: var(--coral); }
.product-quick-facts span { color: var(--muted); font-size: 11px; }
.product-quick-facts strong { margin-top: 3px; font-size: 13px; line-height: 1.4; }
.product-content-layout { padding: 70px 0 86px; display: grid; grid-template-columns: minmax(0, 1fr) 330px; align-items: start; gap: 82px; }
.detail-section { padding: 0 0 54px; }
.detail-section + .detail-section { padding-top: 48px; border-top: 1px solid var(--line); }
.detail-section h2 { margin: 0 0 20px; font-size: 25px; letter-spacing: 0; }
.detail-section > p:not(.eyebrow) { margin: 0; color: var(--ink-soft); font-size: 14px; line-height: 1.9; }
.long-description { color: var(--ink-soft); font-size: 15px; line-height: 2; white-space: pre-wrap; overflow-wrap: anywhere; }
.detail-placeholder { padding: 18px; border-left: 3px solid var(--yellow); background: var(--yellow-soft); }
.detail-heading-with-icon { margin-bottom: 20px; display: flex; align-items: flex-start; gap: 13px; }
.detail-heading-with-icon > svg { width: 23px; height: 23px; margin-top: 2px; color: var(--coral); }
.detail-heading-with-icon h2 { margin-bottom: 0; }
.product-contact-panel { position: sticky; top: 94px; padding: 24px; border: 1px solid var(--line-strong); border-radius: 8px; background: var(--white); }
.product-contact-panel h2 { margin: 0; font-size: 22px; }
.product-contact-panel > p:not(.eyebrow) { margin: 12px 0 6px; color: var(--muted); font-size: 12px; line-height: 1.6; }
.aside-product-name { display: block; margin-bottom: 18px; font-size: 14px; line-height: 1.5; overflow-wrap: anywhere; }
.aside-qr { width: 100%; max-width: 220px; margin: 0 auto 16px; aspect-ratio: 1; object-fit: contain; border: 1px solid var(--line); }
.aside-wechat-id { margin-bottom: 13px; padding: 10px 12px; display: flex; justify-content: space-between; gap: 12px; border: 1px solid var(--line); border-radius: 6px; background: var(--paper); }
.aside-wechat-id span { color: var(--muted); font-size: 11px; }
.aside-wechat-id strong { font-size: 13px; }
.product-contact-panel .large-button { width: 100%; }
.product-contact-panel ul { margin: 18px 0 0; padding: 16px 0 0; display: grid; gap: 9px; border-top: 1px solid var(--line); list-style: none; }
.product-contact-panel li { display: flex; align-items: center; gap: 8px; color: var(--ink-soft); font-size: 11px; }
.product-contact-panel li svg { width: 14px; height: 14px; color: var(--green); }
.related-section { padding-top: 72px; border-top: 1px solid var(--line); }
.related-section .section-heading { margin-bottom: 26px; }
.related-card .product-info { min-height: 176px; }

@media (max-width: 1040px) {
  .home-hero { grid-template-columns: minmax(0, 1fr) minmax(340px, .85fr); gap: 42px; }
  .hero-copy h1 { font-size: 54px; }
  .product-grid, .related-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .product-hero { gap: 44px; }
  .product-content-layout { gap: 48px; }
  .trust-strip > div { padding-right: 14px; padding-left: 14px; }
}

@media (max-width: 820px) {
  .site-nav { display: none; }
  .home-hero { grid-template-columns: minmax(0, 1fr) minmax(300px, .8fr); gap: 28px; }
  .hero-products { gap: 8px; }
  .hero-product { min-height: 170px; padding: 17px 15px 14px; }
  .trust-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .trust-strip > div { border-bottom: 1px solid rgba(255, 255, 255, .15); }
  .trust-strip > div:nth-child(2) { border-right: 0; }
  .trust-strip > div:nth-last-child(-n+2) { border-bottom: 0; }
  .purchase-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 34px 0; }
  .purchase-steps li:nth-child(3) { padding-left: 0; border-left: 0; }
  .faq-section { gap: 44px; }
  .footer-main { grid-template-columns: 1fr auto; }
  .footer-main p { grid-column: 1 / -1; grid-row: 2; }
  .product-hero { grid-template-columns: minmax(300px, .9fr) minmax(0, 1.1fr); gap: 30px; }
  .product-content-layout { grid-template-columns: minmax(0, 1fr) 290px; gap: 30px; }
}

@media (max-width: 680px) {
  body.storefront { padding-bottom: 76px; }
  .site-header { height: 60px; }
  .site-header-inner { width: calc(100% - 32px); gap: 12px; }
  .brand-mark { width: 34px; height: 34px; flex-basis: 34px; }
  .brand-wordmark small { display: none; }
  .header-contact { width: 42px; min-height: 40px; padding: 0; }
  .header-contact span { display: none; }
  .home-hero { width: calc(100% - 32px); min-height: 0; padding: 40px 0 38px; grid-template-columns: 1fr; gap: 34px; }
  .hero-copy h1 { font-size: 46px; }
  .hero-tagline { margin-top: 10px; font-size: 21px; }
  .hero-description { margin-top: 15px; font-size: 14px; line-height: 1.8; }
  .hero-actions { margin-top: 23px; }
  .hero-actions .large-button { flex: 1 1 160px; }
  .hero-products { grid-template-columns: repeat(4, minmax(132px, 1fr)); margin-right: -16px; padding-right: 16px; overflow-x: auto; scrollbar-width: none; }
  .hero-products::-webkit-scrollbar { display: none; }
  .hero-product { min-height: 156px; }
  .hero-product-image img { width: 64px; height: 64px; }
  .hero-empty-mark { min-height: 190px; }
  .trust-strip { padding: 0 16px; }
  .trust-strip > div { min-height: 98px; padding: 18px 10px; gap: 10px; }
  .trust-strip > div:first-child { padding-left: 0; }
  .trust-strip > div:nth-child(odd) { padding-left: 0; }
  .trust-strip > div:nth-child(even) { padding-right: 0; }
  .trust-strip svg { width: 19px; height: 19px; }
  .trust-strip strong { font-size: 12px; }
  .trust-strip span { font-size: 10px; }
  .catalog-section, .faq-section, .product-page-shell { width: calc(100% - 32px); }
  .catalog-section { padding: 56px 0 64px; }
  .section-heading { align-items: flex-start; }
  .section-heading h2, .faq-intro h2 { font-size: 27px; }
  .category-filter { margin-top: 23px; }
  .product-grid, .related-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
  .product-info { min-height: 176px; padding: 14px; gap: 16px; }
  .product-info h3 { font-size: 14px; }
  .product-summary { font-size: 11px; }
  .product-card-footer { align-items: center; }
  .product-price { font-size: 22px; }
  .detail-link { display: none; }
  .visual-label { left: 8px; top: 8px; }
  .purchase-section { padding: 56px 16px 54px; }
  .purchase-heading { display: block; }
  .purchase-heading > p { margin: 12px 0 0; text-align: left; }
  .purchase-steps { margin-top: 30px; grid-template-columns: 1fr; gap: 0; }
  .purchase-steps li, .purchase-steps li:nth-child(3) { min-height: 0; padding: 22px 34px 24px 43px; border: 0; border-top: 1px solid #ded09f; }
  .purchase-steps li:first-child { padding-top: 12px; border-top: 0; }
  .purchase-steps li > span { right: 0; top: 24px; }
  .purchase-steps li:first-child > span { top: 14px; }
  .purchase-steps li > svg { position: absolute; left: 0; top: 22px; width: 23px; height: 23px; }
  .purchase-steps li:first-child > svg { top: 12px; }
  .purchase-steps h3 { margin: 0 0 5px; }
  .purchase-contact { width: 100%; }
  .faq-section { padding: 60px 0 68px; grid-template-columns: 1fr; gap: 34px; }
  .footer-main { gap: 22px 14px; }
  .footer-meta { display: grid; gap: 7px; }
  .wechat-dialog { padding: 20px; }
  .wechat-dialog-heading h2 { font-size: 20px; }
  .wechat-dialog-body { grid-template-columns: 1fr; }
  .wechat-qr { width: min(230px, 100%); margin: 0 auto; }
  .mobile-purchase-bar { position: fixed; left: 0; right: 0; bottom: 0; z-index: 35; height: 68px; padding: 9px 14px max(9px, env(safe-area-inset-bottom)); display: flex; align-items: center; justify-content: space-between; gap: 14px; border-top: 1px solid var(--line-strong); background: rgba(255, 255, 255, .97); box-shadow: 0 -8px 24px rgba(23, 48, 51, .08); }
  .mobile-purchase-bar > div { min-width: 0; display: grid; gap: 2px; }
  .mobile-purchase-bar span { color: var(--muted); font-size: 10px; }
  .mobile-purchase-bar strong { overflow: hidden; font-size: 13px; text-overflow: ellipsis; }
  .mobile-purchase-bar .primary-button { min-height: 44px; flex: 0 0 auto; }
  .clipboard-toast { bottom: 86px; }
  .product-page-shell { padding-top: 20px; }
  .product-hero { padding: 27px 0 40px; grid-template-columns: 1fr; gap: 28px; }
  .product-detail-visual { aspect-ratio: 4 / 3; }
  .product-hero-copy h1 { font-size: 31px; }
  .product-detail-summary { font-size: 14px; }
  .product-detail-price { font-size: 33px; }
  .product-hero-actions .large-button { flex: 1 1 150px; }
  .product-quick-facts { grid-template-columns: 1fr; }
  .product-quick-facts > div, .product-quick-facts > div:first-child, .product-quick-facts > div:last-child { min-height: 74px; padding: 15px 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .product-quick-facts > div:last-child { border-bottom: 0; }
  .product-content-layout { padding: 50px 0 65px; grid-template-columns: 1fr; gap: 10px; }
  .detail-section { padding-bottom: 42px; }
  .detail-section + .detail-section { padding-top: 38px; }
  .detail-section h2 { font-size: 22px; }
  .long-description { font-size: 14px; line-height: 1.9; }
  .product-contact-panel { position: static; margin-top: 8px; }
  .related-section { padding-top: 54px; }
  .related-section .section-heading { align-items: flex-end; }
  .related-section .text-link { font-size: 11px; }
}

@media (max-width: 400px) {
  .hero-copy h1 { font-size: 42px; }
  .hero-actions { display: grid; }
  .product-grid, .related-grid { grid-template-columns: 1fr; }
  .product-visual { aspect-ratio: 16 / 9; }
  .product-info { min-height: 155px; }
  .product-summary { min-height: 0; }
  .wechat-dialog { width: calc(100% - 20px); padding: 16px; }
  .footer-wechat { font-size: 11px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}