:root {
  color-scheme: light;
  --paper: #faf9f5;
  --ink: #203e32;
  --body: #343c36;
  --muted: #72756c;
  --line: #d9dcd1;
  --surface: #ebece5;
  --accent: #bd502d;
  --serif: "Songti SC", "STSong", "Noto Serif CJK SC", "SimSun", serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; scroll-padding-top: 1.5rem; }
body { margin: 0; background: var(--paper); color: var(--body); font: 1rem/1.65 var(--sans); -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { color: inherit; cursor: pointer; }
button:focus-visible, a:focus-visible, input:focus-visible, summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 5px; }
button:disabled { cursor: default; }
svg { display: block; width: 1.25rem; height: 1.25rem; flex-shrink: 0; }
.sr-only, .skip-link:not(:focus) { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; }
.skip-link:focus { display: block; padding: .75rem 2rem; background: var(--ink); color: white; }
.masthead { max-width: 1440px; padding: 0 clamp(1.25rem, 4vw, 4rem); margin: auto; min-height: 82px; display: flex; align-items: center; justify-content: space-between; gap: 1.25rem; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; flex-wrap: wrap; gap: .65rem; color: var(--ink); font: 600 1.45rem/1.4 var(--serif); letter-spacing: .025em; }
.brand-mark { width: 14px; height: 14px; flex: 0 0 14px; border-radius: 50% 50% 50% 3px; background: var(--accent); transform: rotate(-18deg); }
.brand-en { margin-left: 1.3rem; font: 500 .75rem/1 var(--sans); letter-spacing: .19em; }
.site-nav { display: flex; align-items: center; gap: 2rem; font-size: .875rem; white-space: nowrap; }
.site-nav a { display: inline-flex; align-items: center; gap: .4rem; min-height: 44px; }
.site-nav a[aria-current] { color: var(--ink); }
.site-nav a[aria-current]::before { content: ""; width: 5px; height: 5px; margin-right: .15rem; background: var(--accent); border-radius: 50%; }
.site-nav a:last-child { color: var(--muted); }
.site-nav a:hover, .footer a:last-child:hover { color: var(--accent); }
.page { max-width: 1440px; margin: auto; padding: 0 clamp(1.25rem, 4vw, 4rem); }
.catalog-intro { display: flex; justify-content: space-between; align-items: flex-end; gap: 1.5rem; padding: 2.35rem 0 1.7rem; }
.heading-line { display: flex; align-items: baseline; gap: 1.25rem; flex-wrap: wrap; }
h1 { margin: 0; color: var(--ink); font: 500 clamp(2.3rem, 3.4vw, 3.35rem)/1.15 var(--serif); letter-spacing: -.06em; }
h1 span { color: var(--accent); }
.edition { color: var(--muted); font-size: .8125rem; }
.search { display: flex; align-items: center; gap: .65rem; width: 240px; padding: .5rem 0; border-bottom: 1px solid #969e8f; }
.search svg { width: 1.1rem; height: 1.1rem; color: var(--ink); }
.search input { min-width: 0; width: 100%; padding: 0; border: 0; border-radius: 0; color: var(--ink); background: transparent; font-size: .875rem; line-height: 1.75; }
.search input::placeholder { color: var(--muted); }
.catalog-bar { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 0 1.5rem; min-height: 62px; margin-bottom: 1.6rem; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.categories { display: flex; flex-wrap: wrap; gap: 0 1.9rem; }
.categories button { position: relative; display: inline-flex; align-items: center; gap: .45rem; min-height: 60px; padding: .6rem 0; border: 0; background: transparent; color: var(--muted); font-size: .9375rem; }
.categories button[aria-pressed="true"] { color: var(--ink); font-weight: 600; }
.categories button[aria-pressed="true"]::after { content: ""; position: absolute; bottom: -1px; left: 0; right: 0; height: 2px; background: var(--ink); }
.categories button:hover { color: var(--ink); }
.categories small { font: 400 .75rem/1.2 var(--sans); color: var(--muted); }
.catalog-count { margin-left: auto; padding: .45rem 0; font-size: .8125rem; color: var(--muted); white-space: nowrap; }
.product-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 3.7rem 2rem; padding-bottom: 3rem; }
.product { min-width: 0; }
.product-meta { display: flex; align-items: center; justify-content: space-between; gap: .6rem; margin-bottom: .35rem; font-size: .75rem; color: var(--muted); letter-spacing: .05em; }
.product-code { color: var(--ink); font-family: ui-monospace, SFMono-Regular, Consolas, monospace; }
.product-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; min-height: 3rem; padding-bottom: .6rem; }
.product-heading h2 { margin: 0; min-width: 0; color: var(--ink); font-size: clamp(1.05rem, 1.65vw, 1.3rem); font-weight: 500; line-height: 1.4; overflow-wrap: anywhere; }
.price { margin: 0; white-space: nowrap; color: var(--ink); font: 400 1.7rem/1.2 Georgia, var(--serif); }
.gallery { display: grid; grid-template-columns: minmax(0, 1fr) 72px; gap: .65rem; height: clamp(270px, 25vw, 340px); }
.gallery.single-photo { grid-template-columns: minmax(0, 1fr); }
.main-photo, .thumbnail { position: relative; display: block; min-width: 0; width: 100%; padding: 0; border: 0; background: var(--surface); overflow: hidden; }
.main-photo img { display: block; width: 100%; height: 100%; object-fit: contain; }
.main-photo { height: 100%; }
.photo-type { position: absolute; top: .65rem; left: .65rem; padding: .15rem .5rem; background: var(--paper); color: var(--ink); font-size: .75rem; }
.photo-open { position: absolute; bottom: .65rem; right: .65rem; display: grid; place-items: center; width: 32px; height: 32px; color: var(--ink); background: var(--paper); border-radius: 50%; transition: background .16s, color .16s; }
.main-photo:hover .photo-open { background: var(--ink); color: var(--paper); }
.photo-open svg { width: 15px; height: 15px; }
.thumb-rail { display: flex; flex-direction: column; align-items: stretch; gap: .65rem; overflow-y: auto; }
.thumbnail img { display: block; width: 100%; aspect-ratio: 3/4; object-fit: contain; }
.thumbnail::after { content: ""; position: absolute; inset: 0; border: 1px solid transparent; pointer-events: none; }
.thumbnail:hover::after { border-color: var(--ink); }
.thumb-label { display: block; padding: .22rem 0; color: var(--muted); background: var(--paper); font-size: .75rem; text-align: center; }
.photo-count { margin: auto 0 0; color: var(--muted); font-size: .75rem; text-align: center; }
.product-copy { padding-top: 1rem; }
.condition { display: flex; align-items: baseline; gap: .45rem; margin: 0 0 .55rem; font-size: .875rem; color: var(--ink); }
.condition::before { content: ""; align-self: center; width: 5px; height: 5px; flex: 0 0 5px; border-radius: 50%; background: currentColor; }
.condition-attention, .condition-fault { color: var(--accent); }
.spec-line { margin: 0 0 .5rem; color: var(--muted); font-size: .875rem; line-height: 1.6; }
.description { margin: 0; color: #555e54; font-size: 1rem; line-height: 1.7; white-space: pre-line; }
.sale-note { margin: .7rem 0 0; color: var(--accent); font-size: .875rem; }
.diagnostic { display: flex; flex-direction: column; min-height: clamp(270px, 25vw, 340px); padding: clamp(1.2rem, 2.3vw, 2rem); background: #efeee5; color: var(--ink); }
.diagnostic-topline { display: flex; justify-content: space-between; gap: .7rem; font-size: .75rem; letter-spacing: .04em; color: var(--muted); }
.diagnostic-title { display: flex; align-items: baseline; flex-wrap: wrap; gap: .6rem; margin: .55rem 0 0; font: 400 clamp(2.4rem, 4.4vw, 4.3rem)/1.15 Georgia, var(--serif); letter-spacing: -.04em; }
.diagnostic-title span { font: 400 1.125rem/1 var(--sans); letter-spacing: 0; }
.diagnostic-result { display: flex; align-items: center; gap: .5rem; margin: .6rem 0 1.1rem; color: var(--accent); font-size: .9375rem; }
.diagnostic-tested .diagnostic-result { color: var(--ink); }
.diagnostic-result svg { width: 1rem; height: 1rem; }
.diagnostic-metrics { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .75rem; margin: auto 0 0; padding-top: .7rem; border-top: 1px solid #cfd1c3; }
.diagnostic-metrics dt { color: var(--muted); font-size: .75rem; }
.diagnostic-metrics dd { margin: .2rem 0 0; font: 400 1.7rem/1.2 Georgia, var(--serif); }
.diagnostic-metrics dd.has-errors { color: var(--accent); }
.diagnostic-detail { margin-top: .8rem; border-top: 1px solid var(--line); }
.diagnostic-detail summary { display: flex; align-items: center; justify-content: space-between; gap: .5rem; padding: .75rem 0; color: var(--ink); cursor: pointer; font-size: .875rem; list-style: none; }
.diagnostic-detail summary::-webkit-details-marker { display: none; }
.diagnostic-detail summary::after { content: "+"; font-size: 1.25rem; line-height: 1; }
.diagnostic-detail[open] summary::after { content: "−"; }
.diagnostic-detail p { margin: 0 0 .7rem; font-size: .875rem; color: #555e54; }
.diagnostic-all { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .6rem 1rem; margin: .5rem 0 1rem; }
.diagnostic-all div { display: flex; justify-content: space-between; gap: .6rem; font-size: .8125rem; }
.diagnostic-all dt { color: var(--muted); }
.diagnostic-all dd { margin: 0; }
.empty { grid-column: 1/-1; padding: 3rem 0; text-align: center; color: var(--muted); }
.text-button { padding: .3rem 0; border: 0; border-bottom: 1px solid var(--ink); background: transparent; color: var(--ink); }
.footer { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 1.25rem; max-width: 1440px; margin: auto; padding: 1.5rem clamp(1.25rem, 4vw, 4rem) 2rem; border-top: 1px solid var(--line); color: var(--muted); font-size: .8125rem; }
.footer p { margin: 0; }
.footer-brand { font-size: 1.125rem; }
.round-button { display: grid; place-items: center; width: 44px; height: 44px; padding: 0; border: 1px solid var(--line); border-radius: 50%; background: var(--paper); color: var(--ink); }
.round-button svg { fill: none; stroke: currentColor; stroke-width: 1.65; stroke-linecap: round; stroke-linejoin: round; }
.round-button:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.back-to-top { position: fixed; right: 1.5rem; bottom: max(1.5rem, env(safe-area-inset-bottom)); z-index: 5; box-shadow: 0 3px 12px #24312712; }
.photo-dialog { width: min(1100px, 94vw); max-width: 94vw; max-height: 94dvh; padding: 1rem; border: 0; background: var(--paper); color: var(--ink); }
.photo-dialog::backdrop { background: #142b23df; }
.dialog-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding-bottom: .8rem; }
.dialog-toolbar p { margin: 0; font-size: .875rem; }
.close { flex-shrink: 0; }
.lightbox-stage { position: relative; display: grid; place-items: center; min-height: 200px; background: var(--surface); }
.lightbox-stage img { display: block; max-width: 100%; width: auto; max-height: 76dvh; object-fit: contain; }
.previous, .next { position: absolute; top: 50%; transform: translateY(-50%); z-index: 1; }
.previous { left: .6rem; }
.next { right: .6rem; }
@media (max-width: 900px) {
  .brand-en { display: none; }
  .edition { display: block; }
  .heading-line { gap: .45rem; flex-direction: column; }
  .product-grid { gap: 2.5rem 1.35rem; }
  .gallery { grid-template-columns: minmax(0, 1fr) 58px; gap: .5rem; height: 285px; }
  .diagnostic { min-height: 285px; }
  .product-heading { min-height: 4rem; }
  .diagnostic-metrics dt { font-size: .75rem; }
}
@media (max-width: 620px) {
  .masthead { min-height: 72px; gap: .75rem; }
  .brand { font-size: 1.2rem; gap: .5rem; }
  .brand-mark { width: 11px; height: 11px; flex-basis: 11px; }
  .site-nav { gap: .85rem; font-size: .875rem; }
  .site-nav a[aria-current] { display: none; }
  .catalog-intro { align-items: stretch; flex-direction: column; gap: 1.1rem; padding: 1.8rem 0 1.3rem; }
  .heading-line { flex-direction: row; align-items: baseline; gap: .7rem; }
  h1 { font-size: 2.45rem; }
  .edition { font-size: .75rem; }
  .search { width: 100%; }
  .search input { font-size: 1rem; }
  .catalog-bar { gap: 0 .7rem; min-height: 57px; margin-bottom: 1.35rem; }
  .categories { gap: 0 1.25rem; }
  .categories button { min-height: 55px; font-size: .875rem; }
  .catalog-count { font-size: .75rem; }
  .product-grid { grid-template-columns: 1fr; gap: 2.35rem; }
  .product-heading { min-height: auto; padding-bottom: .7rem; }
  .product-heading h2 { font-size: 1.2rem; }
  .gallery { height: clamp(290px, 86vw, 370px); grid-template-columns: minmax(0, 1fr) 62px; }
  .diagnostic { min-height: 300px; padding: 1.5rem; }
  .diagnostic-title { margin-top: .9rem; font-size: 3.75rem; }
  .diagnostic-result { margin-bottom: 1.2rem; }
  .diagnostic-metrics { gap: .75rem; }
  .diagnostic-metrics dt { font-size: .8125rem; }
  .footer { align-items: flex-start; flex-direction: column; gap: .65rem; padding-bottom: 4.5rem; }
  .photo-dialog { width: 96vw; max-width: 96vw; padding: .65rem; }
  .dialog-toolbar p { font-size: .8125rem; }
  .back-to-top { right: 1rem; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; } }

.toast { position: fixed; z-index: 10; left: 50%; bottom: 1.5rem; transform: translate(-50%, 10px); max-width: calc(100vw - 2rem); padding: .7rem 1rem; background: var(--ink); color: var(--paper); font-size: .875rem; opacity: 0; pointer-events: none; transition: opacity .15s, transform .15s; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }