/* YI DX IMPORT INC · B2B catalog (Muji-quiet + Shopify wholesaler)
   Design read: modest importer, sku-forward, one accent, no decorative meta labels */

:root {
  --paper: #f7f6f3;
  --surface: #ffffff;
  --ink: #1a1d18;
  --mute: #5c6358;
  --rule: #dddcd6;
  --accent: #3d5c45;
  --accent-hover: #2f4635;
  --accent-soft: #e8efe9;

  --s-1: 8px;
  --s-2: 16px;
  --s-3: 24px;
  --s-4: 40px;
  --s-5: 64px;
  --s-6: 88px;

  --max: 1180px;
  --nav-h: 64px;
  --sans: "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, "Cascadia Code", "Segoe UI Mono", monospace;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 400;
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 var(--s-3); }

/* Announcement (Shopify B2B strip, modest) */
.announce {
  background: var(--ink);
  color: #f4f3ef;
  font-size: 13px;
  text-align: center;
  padding: 10px var(--s-3);
}
.announce a { color: #fff; text-decoration: underline; text-underline-offset: 3px; }

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(247, 246, 243, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}
.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--s-3);
  height: var(--nav-h);
  display: flex;
  align-items: center;
  gap: var(--s-3);
}
.brand {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.brand small {
  display: block;
  font-size: 11px;
  letter-spacing: 0.02em;
  text-transform: none;
  color: var(--mute);
  font-weight: 400;
  margin-top: 2px;
}
.nav-links {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: var(--s-3);
  font-size: 14px;
}
.nav-links a { color: var(--mute); padding: 4px 0; border-bottom: 1px solid transparent; }
.nav-links a:hover,
.nav-links a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--ink); }
.lang { display: flex; gap: var(--s-1); padding-left: var(--s-2); margin-left: var(--s-2); border-left: 1px solid var(--rule); font-size: 13px; color: var(--mute); }
.lang a[aria-current="true"] { color: var(--ink); font-weight: 500; }
.menu-btn {
  display: none;
  margin-left: auto;
  border: 1px solid var(--rule);
  background: var(--surface);
  padding: 8px 12px;
  font: inherit;
  font-size: 13px;
  cursor: pointer;
}

/* Typography */
h1, h2, h3 { font-weight: 500; line-height: 1.2; margin: 0 0 var(--s-2); }
h1 { font-size: clamp(26px, 3.2vw, 36px); max-width: 16ch; }
h2 { font-size: 21px; }
.page-title { font-size: clamp(24px, 2.8vw, 32px); max-width: 22ch; }
.lede { color: var(--mute); font-size: 16px; max-width: 48ch; line-height: 1.65; }
.section { padding: var(--s-5) 0; }
.section-tight { padding: var(--s-4) 0; }
.section-head { margin-bottom: var(--s-4); display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: var(--s-2); }
.section-head .lede { margin: 0; }

/* Hero · Muji product photography + Shopify clarity */
.hero {
  padding: var(--s-4) 0 var(--s-5);
}
.hero-split {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: var(--s-4);
  align-items: center;
}
.hero-copy .lede { margin-bottom: var(--s-3); }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--s-2); }
.hero-media {
  background: var(--surface);
  border: 1px solid var(--rule);
  aspect-ratio: 4 / 3;
  overflow: hidden;
}
.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: contrast(1.02) saturate(0.92);
}

/* Trust trio */
.trust-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-3);
  padding: var(--s-4) 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.trust-row div { font-size: 14px; color: var(--mute); }
.trust-row strong { display: block; color: var(--ink); font-weight: 500; font-size: 13px; letter-spacing: 0.04em; text-transform: uppercase; margin-bottom: 6px; }

/* Collection cards (Shopify collection grid, Muji photos) */
.collections {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-3);
}
.collection-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--rule);
  transition: border-color 160ms ease;
}
.collection-card:hover { border-color: var(--mute); }
.collection-card img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  filter: saturate(0.94);
}
.collection-card .meta { padding: var(--s-2) var(--s-2) var(--s-3); }
.collection-card h3 { font-size: 15px; margin: 0 0 4px; }
.collection-card .zh { font-size: 13px; color: var(--mute); }
.collection-card .count { font-size: 12px; color: var(--mute); margin-top: var(--s-1); }

/* SKU product grid (B2B catalog) */
.catalog-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-2);
  margin-bottom: var(--s-4);
  padding-bottom: var(--s-3);
  border-bottom: 1px solid var(--rule);
}
.chip {
  font-size: 13px;
  padding: 8px 14px;
  border: 1px solid var(--rule);
  background: var(--surface);
  color: var(--mute);
}
.chip:hover,
.chip.is-active { border-color: var(--ink); color: var(--ink); background: var(--surface); }
.chip.is-active { background: var(--accent-soft); border-color: var(--accent); color: var(--accent-hover); }

.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--s-3);
}
.product-card {
  background: var(--surface);
  border: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
}
.product-card .thumb {
  aspect-ratio: 1;
  overflow: hidden;
  background: #f0efeb;
}
.product-card .thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: opacity 200ms ease;
}
.product-card:hover .thumb img { opacity: 0.94; }
.product-card .body { padding: var(--s-2); flex: 1; display: flex; flex-direction: column; }
.product-card h3 { font-size: 14px; font-weight: 500; margin: 0 0 2px; line-height: 1.35; }
.product-card .sub-zh { font-size: 12px; color: var(--mute); margin-bottom: var(--s-2); }
.sku-row {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--mute);
  margin-bottom: var(--s-1);
}
.pack-line { font-size: 12px; color: var(--mute); margin-bottom: var(--s-2); }
.product-card .card-cta {
  margin-top: auto;
  font-size: 13px;
  font-weight: 500;
  color: var(--accent);
  padding-top: var(--s-2);
  border-top: 1px solid var(--rule);
}
.product-card .card-cta:hover { color: var(--accent-hover); }

.catalog-group { margin-bottom: var(--s-6); scroll-margin-top: calc(var(--nav-h) + 24px); }
.catalog-group h2 { margin-bottom: var(--s-1); }
.catalog-group .group-desc { color: var(--mute); font-size: 14px; margin-bottom: var(--s-3); max-width: 52ch; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  font-size: 14px;
  font-weight: 500;
  background: var(--accent);
  color: #fff;
  border: 1px solid var(--accent);
  cursor: pointer;
  transition: background 160ms ease, transform 160ms ease;
}
.btn:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: #fff; }
.btn:active { transform: scale(0.98); }
.btn.ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--rule);
}
.btn.ghost:hover { background: var(--surface); }

/* Contact blocks */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s-5);
}
.contact-list { list-style: none; padding: 0; margin: 0; }
.contact-list li {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: var(--s-2);
  padding: var(--s-2) 0;
  border-bottom: 1px solid var(--rule);
  font-size: 15px;
}
.contact-list .k { font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--mute); padding-top: 2px; }
.panel {
  background: var(--surface);
  border: 1px solid var(--rule);
  padding: var(--s-4);
}
.panel h2 { font-size: 18px; }

.prose p { max-width: 58ch; color: var(--mute); }
.prose p + p { margin-top: var(--s-2); }

.foot {
  border-top: 1px solid var(--rule);
  padding: var(--s-4) 0;
  font-size: 13px;
  color: var(--mute);
}
.foot-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--s-3);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--s-2);
}
.foot a { text-decoration: underline; text-underline-offset: 2px; }

@media (max-width: 900px) {
  .hero-split { grid-template-columns: 1fr; }
  .hero-media { order: -1; max-height: 280px; }
  .trust-row { grid-template-columns: 1fr; gap: var(--s-2); }
  .collections { grid-template-columns: repeat(2, 1fr); }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .nav-links { display: none; position: fixed; top: calc(var(--nav-h) + 36px); left: 0; right: 0; flex-direction: column; align-items: flex-start; background: var(--paper); border-bottom: 1px solid var(--rule); padding: var(--s-3); }
  .nav-links.open { display: flex; }
  .lang { border-left: none; margin-left: 0; padding-left: 0; }
  .menu-btn { display: inline-flex; }
  .contact-list li { grid-template-columns: 1fr; gap: 4px; }
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}