:root {
  --ink: #171512;
  --paper: #e8e1d5;
  --paper-soft: #f0ebe3;
  --light: #eee8df;
  --clay: #9d3f2c;
  --muted-dark: rgba(23, 21, 18, .65);
  --muted-light: rgba(238, 232, 223, .66);
  --rule-dark: rgba(23, 21, 18, .28);
  --rule-light: rgba(238, 232, 223, .28);
  --gutter: clamp(2rem, 5.2vw, 5.5rem);
  --serif: Georgia, Cambria, "Times New Roman", "STSong", "SimSun", serif;
  --sans: Arial, Helvetica, "Microsoft YaHei", sans-serif;
  --ease: cubic-bezier(.22, 1, .36, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--ink); }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
body.menu-open { overflow: hidden; }
img { display: block; max-width: 100%; }
a { color: inherit; }
button, input, textarea { font: inherit; }
button { color: inherit; }
::selection { color: var(--light); background: var(--clay); }

.site-intro {
  position: fixed;
  z-index: 2000;
  inset: 0;
  background: #000;
  pointer-events: none;
  animation: site-intro-reveal 1.6s cubic-bezier(.45, 0, .2, 1) .12s both;
}

@keyframes site-intro-reveal {
  0%, 16% { opacity: 1; visibility: visible; }
  100% { opacity: 0; visibility: hidden; }
}

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

.skip-link {
  position: fixed;
  z-index: 1000;
  top: .75rem;
  left: .75rem;
  padding: .75rem 1rem;
  color: var(--ink);
  background: var(--paper);
  transform: translateY(-160%);
  transition: transform .18s ease;
}
.skip-link:focus { transform: translateY(0); }

.dark-section { color: var(--light); background: var(--ink); }
.paper-section { color: var(--ink); background: var(--paper); }

.site-header {
  position: absolute;
  z-index: 50;
  top: 0;
  left: 0;
  width: 100%;
  min-height: 6rem;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 2rem;
  padding: 1.65rem var(--gutter);
  color: var(--light);
}
.detail-header { color: var(--ink); }
.brand {
  display: inline-flex;
  align-items: center;
  gap: .9rem;
  width: max-content;
  text-decoration: none;
  white-space: nowrap;
}
.brand-cn {
  font-family: "STSong", "SimSun", var(--serif);
  font-size: 1.45rem;
  line-height: 1;
  letter-spacing: .06em;
}
.brand-en {
  font-family: var(--serif);
  font-size: .95rem;
  letter-spacing: .24em;
}
.desktop-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(1.75rem, 3.1vw, 3.75rem);
}
.desktop-nav a,
.language-toggle,
.header-viewing,
.back-link {
  font-family: var(--sans);
  font-size: .72rem;
  line-height: 1;
  letter-spacing: .12em;
  text-transform: uppercase;
  text-decoration: none;
}
.desktop-nav a { position: relative; }
.desktop-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -.45rem;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform .35s var(--ease);
}
.desktop-nav a:hover::after,
.desktop-nav a:focus-visible::after { transform: scaleX(1); transform-origin: left; }
.header-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 2.1rem;
}
.language-toggle,
.menu-toggle,
.text-link,
.outline-link,
.dialog-close,
.dialog-submit {
  border: 0;
  background: none;
  cursor: pointer;
}
.language-toggle { padding: .4rem 0; }
.text-link {
  display: inline-block;
  width: fit-content;
  max-width: 100%;
  padding: 0 0 .35rem;
  font-family: var(--sans);
  font-size: .72rem;
  line-height: 1.2;
  letter-spacing: .18em;
  text-transform: uppercase;
  text-decoration: none;
  overflow-wrap: anywhere;
  border-bottom: 1px solid currentColor;
}
.text-link:hover,
.text-link:focus-visible,
.language-toggle:hover,
.language-toggle:focus-visible { color: var(--clay); }
.menu-toggle { display: none; width: 2rem; height: 2rem; padding: .3rem; }
.menu-toggle span:not(.sr-only) { display: block; height: 1px; margin: .32rem 0; background: currentColor; transition: transform .25s ease, opacity .25s ease; }
.mobile-nav { display: none; }

.hero {
  position: relative;
  min-height: 100svh;
  overflow: hidden;
  display: grid;
  align-items: center;
  padding: 8rem var(--gutter) 4rem;
}
.hero-media,
.hero-slide {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.hero-media { overflow: hidden; background: #0b0a09; }
.hero-slide {
  object-fit: cover;
  object-position: var(--hero-position, center 44%);
  opacity: 0;
  transform: scale(1.025);
  transition: opacity 1.1s ease, transform 7s var(--ease);
}
.hero-slide.is-active {
  z-index: 1;
  opacity: 1;
  transform: scale(1);
}
.hero-shade {
  position: absolute;
  z-index: 1;
  inset: 0;
  background: linear-gradient(90deg, rgba(8, 7, 6, .88) 0%, rgba(8, 7, 6, .64) 38%, rgba(8, 7, 6, .08) 72%);
  pointer-events: none;
}
.hero-copy {
  position: relative;
  z-index: 2;
  width: min(47rem, 52vw);
  padding-top: 2rem;
}
.hero h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(4rem, 4.8vw, 5.4rem);
  font-weight: 400;
  line-height: .95;
  letter-spacing: -.052em;
}
.hero h1 span { display: block; }
.hero h1 span + span { margin-top: .18em; }
.hero-copy > p {
  width: min(25rem, 80%);
  margin: 2.3rem 0 2.5rem;
  color: var(--muted-light);
  font-size: clamp(.95rem, 1.15vw, 1.12rem);
}
.hero-index {
  position: absolute;
  z-index: 2;
  right: var(--gutter);
  bottom: 1.5rem;
  margin: 0;
  color: var(--muted-light);
  font-size: .62rem;
  letter-spacing: .22em;
}

.forms { padding: clamp(6rem, 10vw, 10rem) var(--gutter) clamp(6rem, 9vw, 9rem); }
.section-heading {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  align-items: end;
  gap: 3rem;
  margin-bottom: clamp(3rem, 6vw, 6rem);
}
.section-heading h2,
.record > h2,
.process h2,
.trace h2,
.use-copy h2,
.footer-statement,
.detail-study-heading h2,
.detail-record-intro h2 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 400;
  letter-spacing: -.045em;
}
.section-heading h2 { font-size: clamp(4rem, 7.2vw, 8rem); line-height: .9; }
.section-heading p {
  max-width: 28rem;
  margin: 0 0 .55rem auto;
  font-size: clamp(1rem, 1.35vw, 1.25rem);
}
.forms-display {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.25rem, 3.2vw, 4rem);
}
.form-item { min-width: 0; }
.form-image {
  margin: 0;
  overflow: hidden;
  aspect-ratio: 3 / 2;
  background: #fff;
  border-bottom: 1px solid var(--rule-dark);
}
.form-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  transition: transform .8s var(--ease);
}
.form-item:hover .form-image img { transform: scale(1.025); }
.catalog-entry { display: flex; justify-content: flex-end; margin-top: 3.5rem; }
.form-meta {
  display: grid;
  grid-template-columns: 2.3rem 1fr;
  gap: .75rem;
  padding-top: 1.8rem;
}
.form-number { color: var(--clay); font-size: .9rem; }
.form-meta h3 {
  margin: -.25rem 0 .2rem;
  font-family: var(--serif);
  font-size: clamp(1.8rem, 2.6vw, 3rem);
  font-weight: 400;
  letter-spacing: .02em;
}
.form-meta h3 span { font-size: .58em; color: var(--muted-dark); }
.measure { margin: 0; color: var(--muted-dark); font-size: .75rem; letter-spacing: .12em; }
.form-meta div > p:not(.measure) { min-height: 4.75rem; max-width: 19rem; margin: 1.2rem 0 1.5rem; color: var(--muted-dark); font-size: .91rem; }

.process { padding: clamp(6rem, 9vw, 9rem) var(--gutter); }
.process-grid {
  display: grid;
  grid-template-columns: minmax(20rem, .72fr) 1.28fr;
  align-items: center;
  gap: clamp(3rem, 7vw, 8rem);
}
.process h2 { max-width: 38rem; font-size: clamp(4rem, 7vw, 7.5rem); line-height: .9; }
.process-lede { margin: 2rem 0 3.6rem; font-family: var(--serif); font-size: clamp(1.15rem, 1.6vw, 1.5rem); }
.process-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-bottom: 1px solid var(--rule-light);
}
.process-tabs button {
  position: relative;
  display: flex;
  gap: .45rem;
  justify-content: flex-start;
  padding: .85rem .25rem .85rem 0;
  color: var(--muted-light);
  border: 0;
  background: none;
  font-family: var(--sans);
  font-size: .7rem;
  text-transform: uppercase;
  cursor: pointer;
}
.process-tabs button::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--clay);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .25s ease;
}
.process-tabs button[aria-selected="true"] { color: var(--light); }
.process-tabs button[aria-selected="true"]::after { transform: scaleX(1); }
.step-description { max-width: 24rem; min-height: 4rem; margin: 2.6rem 0 0; color: var(--muted-light); font-size: 1.05rem; }
.process-figure { margin: 0; overflow: hidden; background: #0d0c0b; }
.process-figure img {
  width: 100%;
  aspect-ratio: 1.15 / .9;
  object-fit: cover;
  object-position: center;
  transition: opacity .28s ease, transform .55s var(--ease), filter .28s ease;
}
.process-figure img.is-switching { opacity: 0; transform: scale(1.012); filter: blur(2px); }

.trace { position: relative; min-height: 55rem; overflow: hidden; display: grid; align-items: end; }
.trace-image {
  position: absolute;
  inset: 0;
  background-image: url("images/work-fengyun.webp");
  background-size: 195% auto;
  background-position: 53% 57%;
  filter: brightness(.42) saturate(1.08);
}
.trace-copy {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: end;
  gap: 2rem;
  width: 100%;
  padding: 0 var(--gutter) 5rem;
}
.trace h2 { font-size: clamp(3.5rem, 6vw, 7rem); }
.trace p { max-width: 28rem; margin: 0 0 .75rem auto; color: var(--muted-light); font-size: 1.1rem; }

.record { padding: clamp(6rem, 9vw, 9rem) var(--gutter); }
.record > h2 { font-size: clamp(3.8rem, 6.5vw, 7.5rem); line-height: .95; }
.record-grid {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: clamp(3rem, 7vw, 8rem);
  align-items: center;
  margin-top: clamp(3rem, 6vw, 6rem);
}
.record-product { margin: 0; overflow: hidden; }
.record-product img { width: 100%; aspect-ratio: 1.3 / .78; object-fit: cover; }
.maker-grid { grid-template-columns: .82fr 1.18fr; }
.maker-portrait { max-width: 40rem; background: #f6f4ef; }
.maker-portrait img { aspect-ratio: 4 / 5; object-fit: cover; object-position: center 18%; }
.maker-copy { max-width: 39rem; }
.maker-copy > p:not(.index-label) { margin: 0 0 1.5rem; color: var(--muted-dark); font-family: var(--serif); font-size: clamp(1.2rem, 1.7vw, 1.55rem); line-height: 1.55; }
.studio-archive {
  margin-top: clamp(5rem, 9vw, 9rem);
  padding-top: clamp(3rem, 5vw, 5rem);
  border-top: 1px solid var(--rule-dark);
}
.studio-heading {
  display: grid;
  grid-template-columns: .5fr 1fr .8fr;
  align-items: end;
  gap: clamp(2rem, 5vw, 6rem);
  margin-bottom: clamp(2.5rem, 5vw, 5rem);
}
.studio-heading h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(3rem, 5vw, 5.7rem);
  font-weight: 400;
  line-height: .95;
  letter-spacing: -.045em;
}
.studio-heading > p:last-child { max-width: 27rem; margin: 0 0 .45rem; color: var(--muted-dark); line-height: 1.65; }
.studio-grid {
  display: grid;
  grid-template-columns: .82fr 1.18fr;
  grid-template-rows: repeat(2, minmax(18rem, 1fr));
  gap: clamp(1rem, 2vw, 2rem);
}
.studio-frame { min-height: 0; margin: 0; overflow: hidden; background: #d8d0c4; }
.studio-frame-tall { grid-row: 1 / 3; }
.studio-frame img { width: 100%; height: 100%; object-fit: cover; transition: transform .8s var(--ease); }
.studio-frame:hover img { transform: scale(1.015); }

.record-list { margin: 0; }
.record-list > div {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--rule-dark);
}
.record-list dt,
.record-list dd { margin: 0; font-size: .76rem; letter-spacing: .07em; text-transform: uppercase; }
.record-list dd { text-align: left; }
.record-list .record-link { border: 0; }

.in-use {
  position: relative;
  min-height: 47rem;
  overflow: hidden;
  display: grid;
  align-items: center;
  color: var(--ink);
  background: #bba488;
}
.in-use > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center; }
.use-shade { position: absolute; z-index: 1; inset: 0; background: linear-gradient(90deg, rgba(232, 225, 213, .96) 0%, rgba(232, 225, 213, .76) 36%, rgba(232, 225, 213, .08) 70%); }
.use-copy { position: relative; z-index: 2; width: min(33rem, 42vw); margin-left: var(--gutter); }
.use-copy h2 { font-size: clamp(3.4rem, 5.6vw, 6.5rem); line-height: .95; }
.use-copy p { max-width: 25rem; margin: 2rem 0 0; font-size: 1.05rem; }

.featured {
  display: grid;
  grid-template-columns: .74fr 1.26fr;
  align-items: center;
  padding: clamp(6rem, 9vw, 9rem) var(--gutter) 0;
}
.featured > * { min-width: 0; }
.featured-copy { position: relative; z-index: 2; padding-right: 2rem; }
.index-label { margin: 0 0 1.5rem; font-size: .69rem; letter-spacing: .21em; text-transform: uppercase; }
.featured-copy h2,
.detail-copy h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(5rem, 8.5vw, 10rem);
  font-weight: 400;
  line-height: .8;
  letter-spacing: -.045em;
}
.featured-copy h3,
.detail-copy h2 {
  max-width: 30rem;
  margin: 2.5rem 0 1.5rem;
  font-family: var(--sans);
  font-size: clamp(1.6rem, 2.1vw, 2.2rem);
  font-weight: 400;
  line-height: 1.2;
}
.featured-copy > p:not(.index-label),
.detail-copy > p:not(.index-label) { max-width: 28rem; margin: 0 0 2.5rem; color: var(--muted-dark); }
.outline-link,
.dialog-submit {
  display: inline-block;
  padding: 1.05rem 1.45rem;
  border: 1px solid currentColor;
  font-family: var(--sans);
  font-size: .68rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  text-decoration: none;
  transition: color .2s ease, background-color .2s ease;
}
.outline-link:hover,
.outline-link:focus-visible { color: var(--light); background: var(--ink); }
.featured-image { margin: 0; overflow: hidden; }
.featured-image { background: transparent; }
.featured-image img { width: 100%; min-height: 38rem; object-fit: contain; object-position: center; }
.spec-rail {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  border-top: 1px solid var(--rule-dark);
}
.spec-rail li { padding: 1.5rem 1rem; text-align: center; font-size: .65rem; letter-spacing: .2em; text-transform: uppercase; border-right: 1px solid var(--rule-dark); }
.spec-rail li:last-child { border-right: 0; }

.site-footer { padding: clamp(5rem, 8vw, 8rem) var(--gutter) 2.5rem; }
.footer-statement { max-width: 80rem; font-size: clamp(4rem, 7.2vw, 8.2rem); line-height: .92; }
.footer-row {
  display: grid;
  grid-template-columns: 1fr 2fr 1fr;
  align-items: end;
  gap: 2rem;
  margin-top: clamp(5rem, 9vw, 9rem);
  padding-top: 1.6rem;
  border-top: 1px solid var(--rule-light);
}
.footer-row > p { max-width: 38rem; margin: 0 auto; color: var(--muted-light); font-size: .75rem; }
.footer-row > .text-link { justify-self: end; }

.viewing-dialog {
  width: min(42rem, calc(100vw - 2rem));
  padding: clamp(2rem, 5vw, 4.5rem);
  color: var(--ink);
  background: var(--paper-soft);
  border: 0;
  box-shadow: 0 2rem 6rem rgba(0, 0, 0, .38);
}
.viewing-dialog::backdrop { background: rgba(23, 21, 18, .78); backdrop-filter: blur(4px); }
.viewing-dialog h2 { margin: 0; font-family: var(--serif); font-size: clamp(3rem, 6vw, 5rem); font-weight: 400; line-height: .95; }
.viewing-dialog p { color: var(--muted-dark); }
.dialog-close { position: absolute; top: 1rem; right: 1.25rem; padding: .25rem; font-family: var(--serif); font-size: 2rem; line-height: 1; }
.viewing-dialog form { display: grid; gap: 1.35rem; margin-top: 2.5rem; }
.viewing-dialog label { display: grid; gap: .45rem; font-size: .68rem; letter-spacing: .16em; text-transform: uppercase; }
.viewing-dialog input,
.viewing-dialog textarea { width: 100%; padding: .8rem 0; color: var(--ink); background: transparent; border: 0; border-bottom: 1px solid var(--rule-dark); outline: 0; resize: vertical; }
.viewing-dialog input:focus,
.viewing-dialog textarea:focus { border-color: var(--clay); }
.dialog-submit { justify-self: start; margin-top: .6rem; }
.dialog-submit:hover,
.dialog-submit:focus-visible { color: var(--light); background: var(--ink); }
.dialog-success .text-link { margin-top: 1.5rem; }

.reveal { opacity: 0; transform: translateY(26px); transition: opacity .75s var(--ease), transform .75s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }

/* Detail page */
.detail-hero {
  display: grid;
  grid-template-columns: .72fr 1.28fr;
  align-items: center;
  min-height: 100svh;
  padding: 9rem var(--gutter) 0;
}
.detail-copy { position: relative; z-index: 2; padding-right: 2rem; }
.detail-copy h1 span { font-size: .34em; color: var(--muted-dark); }
.detail-hero-image { margin: 0; overflow: hidden; }
.detail-hero-image { background: #fff; }
.detail-hero-image img { width: 100%; min-height: 39rem; object-fit: contain; }
.detail-hero .spec-rail { align-self: end; }
.back-link { justify-self: center; }

.detail-study { padding: clamp(6rem, 9vw, 9rem) var(--gutter); }
.detail-study-heading {
  display: grid;
  grid-template-columns: 1.3fr .7fr;
  align-items: end;
  gap: 3rem;
  margin-bottom: clamp(4rem, 7vw, 7rem);
}
.detail-study-heading h2 { max-width: 55rem; font-size: clamp(4rem, 7vw, 7.5rem); line-height: .95; }
.detail-study-heading p { max-width: 25rem; margin: 0 0 .55rem auto; color: var(--muted-light); }
.study-grid { display: grid; grid-template-columns: 1.2fr .8fr .8fr; gap: 1.25rem; }
.study {
  position: relative;
  min-height: 37rem;
  margin: 0;
  overflow: hidden;
  background-image: url("images/work-fengyun.webp");
  background-repeat: no-repeat;
  background-color: #201c18;
}
.study-lid { background-size: 235% auto; background-position: 52% 16%; }
.study-surface { background-size: 300% auto; background-position: 49% 68%; }
.study-profile { background-size: 190% auto; background-position: 79% 50%; }
.study figcaption {
  position: absolute;
  left: 1.2rem;
  bottom: 1rem;
  padding: .45rem .7rem;
  color: var(--light);
  background: var(--ink);
  font-size: .65rem;
  letter-spacing: .18em;
  text-transform: uppercase;
}
.hero-carousel-controls {
  position: absolute;
  z-index: 3;
  left: var(--gutter);
  bottom: 1.35rem;
  display: flex;
  gap: .5rem;
}
.hero-carousel-button {
  position: relative;
  width: 2.8rem;
  height: 1.5rem;
  padding: 0;
  border: 0;
  color: var(--light);
  background: transparent;
  cursor: pointer;
}
.hero-carousel-button::before,
.hero-carousel-button::after {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 100%;
  height: 1px;
  background: rgba(255, 255, 255, .34);
}
.hero-carousel-button::after {
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .4s var(--ease);
}
.hero-carousel-button[aria-current="true"]::after { transform: scaleX(1); }
.hero-carousel-button:focus-visible { outline: 1px solid currentColor; outline-offset: 3px; }
.detail-record {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(4rem, 9vw, 10rem);
  padding: clamp(6rem, 9vw, 9rem) var(--gutter);
}
.detail-record-intro h2 { max-width: 42rem; font-size: clamp(3.5rem, 5.7vw, 6rem); line-height: .95; }
.detail-record-intro > p:last-child { max-width: 31rem; margin-top: 2rem; color: var(--muted-dark); }

.catalog-page { background: var(--paper); }
.catalog-header { color: var(--ink); }
.catalog-hero { padding: clamp(10rem, 14vw, 13rem) var(--gutter) 4rem; border-bottom: 1px solid var(--rule-dark); }
.catalog-hero-grid {
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  align-items: end;
  gap: clamp(3rem, 7vw, 8rem);
}
.catalog-hero h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(5rem, 9vw, 10rem);
  font-weight: 400;
  line-height: .82;
  letter-spacing: -.055em;
}
.catalog-intro { max-width: 37rem; margin: 0 0 1.35rem; font-family: var(--serif); font-size: clamp(1.25rem, 1.8vw, 1.65rem); line-height: 1.5; }
.catalog-notice { max-width: 36rem; margin: 0; color: var(--muted-dark); font-size: .9rem; }
.catalog-tools { display: grid; grid-template-columns: minmax(16rem, 32rem) auto; align-items: center; justify-content: space-between; gap: 2rem; margin-top: 4rem; }
.catalog-tools input {
  width: 100%;
  padding: 1rem 0;
  color: var(--ink);
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--ink);
  border-radius: 0;
  outline: none;
}
.catalog-tools input:focus { border-bottom-color: var(--clay); }
.catalog-tools p { margin: 0; color: var(--muted-dark); font-size: .72rem; letter-spacing: .14em; text-transform: uppercase; }
.catalog-content { padding: 4rem var(--gutter) clamp(7rem, 10vw, 11rem); }
.catalog-pagination {
  display: grid;
  grid-template-columns: minmax(10rem, 1fr) auto;
  align-items: center;
  gap: 2rem;
  padding: 1.35rem 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--rule-dark);
  scroll-margin-top: 1.5rem;
}
.catalog-pagination:empty { display: none; }
.catalog-pagination--top { margin-bottom: 3.5rem; }
.catalog-pagination--bottom { margin-top: 5rem; }
.catalog-pagination-summary {
  display: flex;
  align-items: baseline;
  gap: 1.2rem;
  margin: 0;
}
.catalog-pagination-summary strong {
  font-family: var(--serif);
  font-size: 1.45rem;
  font-weight: 400;
}
.catalog-pagination-summary span {
  color: var(--muted-dark);
  font-size: .68rem;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.catalog-pagination-controls {
  display: grid;
  grid-template-columns: auto auto auto;
  align-items: center;
  gap: .75rem;
}
.catalog-page-numbers {
  display: flex;
  align-items: center;
  gap: .3rem;
}
.catalog-page-step,
.catalog-page-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  color: var(--ink);
  text-decoration: none;
  border: 1px solid var(--rule-dark);
  transition: color .2s ease, background-color .2s ease, border-color .2s ease;
}
.catalog-page-step {
  min-width: 7.25rem;
  padding: .65rem 1rem;
  font-size: .7rem;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.catalog-page-number {
  width: 2.75rem;
  font-family: var(--serif);
  font-size: 1rem;
}
.catalog-page-step:hover,
.catalog-page-step:focus-visible,
.catalog-page-number:hover,
.catalog-page-number:focus-visible {
  color: var(--light);
  background: var(--ink);
  border-color: var(--ink);
}
.catalog-page-number[aria-current="page"] {
  color: var(--light);
  background: var(--clay);
  border-color: var(--clay);
}
.catalog-page-next:not([aria-disabled="true"]) {
  color: var(--light);
  background: var(--ink);
  border-color: var(--ink);
}
.catalog-page-next:not([aria-disabled="true"]):hover,
.catalog-page-next:not([aria-disabled="true"]):focus-visible {
  background: var(--clay);
  border-color: var(--clay);
}
.catalog-page-step[aria-disabled="true"] {
  color: var(--muted-dark);
  cursor: not-allowed;
  opacity: .42;
}
.catalog-page-step:focus-visible,
.catalog-page-number:focus-visible {
  outline: 2px solid var(--clay);
  outline-offset: 3px;
}
.catalog-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 3.5rem clamp(1.25rem, 2.6vw, 3rem); }
.catalog-card { min-width: 0; }
.catalog-image {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  padding: 0;
  overflow: hidden;
  background: #fff;
  border: 0;
  border-bottom: 1px solid var(--rule-dark);
  cursor: zoom-in;
}
.catalog-image img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; transition: transform .6s var(--ease); }
.catalog-image:hover img,
.catalog-image:focus-visible img { transform: scale(1.025); }
.catalog-card-meta { display: grid; grid-template-columns: 5.8rem 1fr; gap: .85rem; padding-top: 1rem; }
.catalog-code { margin: .15rem 0 0; color: var(--clay); font-size: .65rem; letter-spacing: .11em; }
.catalog-card h2 { margin: 0; font-family: var(--serif); font-size: 1.25rem; font-weight: 400; line-height: 1.25; overflow-wrap: anywhere; }
.catalog-empty { margin: 5rem 0; font-family: var(--serif); font-size: 2rem; }
.catalog-footer { display: flex; align-items: flex-end; justify-content: space-between; gap: 3rem; padding: 4rem var(--gutter); }
.catalog-footer p { max-width: 38rem; margin: 0; font-family: var(--serif); font-size: clamp(1.5rem, 2.5vw, 2.5rem); line-height: 1.25; }
.hero-actions { display: flex; align-items: center; gap: 1.5rem; margin-top: 2.25rem; }
.hero-actions .hero-link { margin-top: 0; }
.hero-primary { display: inline-flex; align-items: center; justify-content: center; min-height: 3rem; padding: .75rem 1.1rem; color: var(--ink); background: var(--light); text-decoration: none; font-size: .68rem; letter-spacing: .13em; text-transform: uppercase; }
.hero-primary:hover, .hero-primary:focus-visible { color: var(--light); background: var(--clay); }
.mobile-contact-bar { display: none; }

/* Authority pages use the same wheel-and-form visual surface. */
.authority-page :where(a, button):focus-visible {
  outline: 2px solid var(--clay);
  outline-offset: 4px;
}
.authority-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(1.5rem, 3vw, 3rem);
}
.authority-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  font-size: .7rem;
  letter-spacing: .12em;
  text-decoration: none;
  text-transform: uppercase;
  border-bottom: 1px solid transparent;
}
.authority-nav a:hover,
.authority-nav a:focus-visible { border-bottom-color: currentColor; }

.authority-hero {
  padding: clamp(10rem, 14vw, 12rem) var(--gutter) clamp(5rem, 8vw, 8rem);
  border-bottom: 1px solid var(--rule-dark);
}
.authority-hero-grid {
  width: min(100%, 74rem);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.65fr) minmax(16rem, .75fr);
  align-items: end;
  gap: clamp(3rem, 7vw, 7rem);
}
.authority-hero--single .authority-hero-copy {
  width: min(100%, 74rem);
  margin: 0 auto;
}
.authority-hero-copy { min-width: 0; }
.authority-eyebrow {
  margin: 0 0 1.35rem;
  color: var(--clay);
  font-size: .68rem;
  line-height: 1.4;
  letter-spacing: .18em;
  text-transform: uppercase;
}
.authority-hero h1 {
  max-width: 62rem;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(4rem, 6.1vw, 6.25rem);
  font-weight: 400;
  line-height: .94;
  letter-spacing: -.052em;
  overflow-wrap: anywhere;
  text-wrap: balance;
}
.authority-lede {
  max-width: 46rem;
  margin: 2.25rem 0 0;
  color: var(--muted-dark);
  font-family: var(--serif);
  font-size: clamp(1.25rem, 1.65vw, 1.58rem);
  line-height: 1.55;
}
.authority-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .9rem;
  margin-top: 2.5rem;
}
.authority-primary,
.authority-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: .8rem 1.15rem;
  font-size: .68rem;
  line-height: 1.2;
  letter-spacing: .11em;
  text-align: center;
  text-decoration: none;
  text-transform: uppercase;
  border: 1px solid var(--ink);
}
.authority-primary {
  color: var(--light);
  background: var(--clay);
  border-color: var(--clay);
}
.authority-secondary { background: transparent; }
.authority-primary:hover,
.authority-primary:focus-visible {
  color: var(--light);
  background: var(--ink);
  border-color: var(--ink);
}
.authority-secondary:hover,
.authority-secondary:focus-visible {
  color: var(--light);
  background: var(--ink);
}

.form-register {
  margin: 0;
  padding-left: clamp(1.5rem, 3vw, 3rem);
  border-left: 1px solid var(--rule-dark);
}
.form-register-diagram {
  position: relative;
  width: min(100%, 19rem);
  aspect-ratio: 1;
  margin: 0 auto;
  font-size: .62rem;
  line-height: 1;
  letter-spacing: .13em;
  text-transform: uppercase;
}
.form-register-diagram::before,
.form-register-diagram::after {
  content: "";
  position: absolute;
}
.form-register-diagram::before {
  top: 28%;
  right: 0;
  left: 0;
  height: 1px;
  background: var(--clay);
}
.form-register-diagram::after {
  top: 28%;
  bottom: 6%;
  left: 50%;
  width: 1px;
  background: var(--rule-dark);
}
.form-register-diagram span {
  position: absolute;
  z-index: 1;
  padding: .35rem .45rem;
  background: var(--paper);
  white-space: nowrap;
}
.form-register-spout,
.form-register-knob,
.form-register-handle {
  top: 28%;
  padding-top: 1.2rem;
  background: transparent;
}
.form-register-spout::before,
.form-register-knob::before,
.form-register-handle::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  width: .45rem;
  height: .45rem;
  background: var(--clay);
  border-radius: 50%;
  transform: translate(-50%, -50%);
}
.form-register-knob { left: 50%; transform: translateX(-50%); }
.form-register-lid { top: 43%; left: 50%; transform: translateX(-50%); }
.form-register-spout { left: 0; }
.form-register-handle { right: 0; }
.form-register-body {
  top: 64%;
  left: 50%;
  width: 8.8rem;
  height: 5.8rem;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid var(--ink);
  border-radius: 48% 48% 42% 42%;
  transform: translate(-50%, -50%);
}
.form-register figcaption {
  max-width: 19rem;
  margin: 1.5rem auto 0;
  color: var(--muted-dark);
  font-size: .78rem;
  line-height: 1.65;
}

.authority-body {
  width: min(calc(100% - (2 * var(--gutter))), 74rem);
  margin: 0 auto;
  padding: clamp(4.5rem, 8vw, 8rem) 0 clamp(6rem, 10vw, 10rem);
}
.authority-section {
  display: grid;
  grid-template-columns: minmax(10rem, 15rem) minmax(0, 46rem);
  gap: clamp(2.5rem, 6vw, 6rem);
  padding: clamp(3.5rem, 6vw, 5.5rem) 0;
  border-top: 1px solid var(--rule-dark);
}
.authority-section:first-child { border-top-color: var(--ink); }
.authority-section > h2,
.authority-source-note > h2,
.authority-related > h2,
.process-archive-step h2 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 400;
  letter-spacing: -.025em;
}
.authority-section > h2 {
  font-size: clamp(2rem, 3.2vw, 3rem);
  line-height: 1.06;
}
.authority-section-copy {
  max-width: 46rem;
  color: var(--muted-dark);
  font-size: 1.03rem;
  line-height: 1.8;
}
.authority-section-copy > :first-child { margin-top: 0; }
.authority-section-copy > :last-child { margin-bottom: 0; }
.authority-section-copy p + p { margin-top: 1.35rem; }

.credential-timeline {
  max-width: 46rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.credential-timeline li {
  display: grid;
  grid-template-columns: 7.5rem minmax(0, 1fr);
  gap: 1.5rem;
  padding: 1.65rem 0;
  border-top: 1px solid var(--rule-dark);
}
.credential-timeline li:first-child {
  padding-top: 0;
  border-top: 0;
}
.credential-timeline time {
  color: var(--clay);
  font-family: var(--serif);
  font-size: 1.35rem;
  font-variant-numeric: tabular-nums;
}
.credential-timeline h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.45rem;
  font-weight: 400;
  line-height: 1.25;
}
.credential-timeline p {
  margin: .65rem 0 0;
  color: var(--muted-dark);
  line-height: 1.75;
}
.authority-section--media .credential-grid { grid-column: 1 / -1; }
.credential-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(2rem, 4vw, 4rem);
  margin-top: 1.5rem;
}
.credential-card {
  min-width: 0;
  margin: 0;
  padding-top: 1rem;
  border-top: 1px solid var(--ink);
}
.credential-media {
  display: block;
  width: 100%;
  padding: clamp(.5rem, 1vw, 1rem);
  background: var(--paper-soft);
  border: 1px solid var(--rule-dark);
}
.credential-media img {
  width: 100%;
  height: auto;
}
.credential-card figcaption { padding-top: 1.25rem; }
.credential-card figcaption span {
  display: block;
  margin-bottom: .5rem;
  color: var(--clay);
  font-size: .67rem;
  letter-spacing: .15em;
  text-transform: uppercase;
}
.credential-card figcaption strong {
  display: block;
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 400;
  line-height: 1.3;
}
.credential-card figcaption p {
  margin: .65rem 0 0;
  color: var(--muted-dark);
  font-size: .88rem;
}

.process-archive-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(3.5rem, 6vw, 6rem) clamp(1.5rem, 3vw, 3rem);
  margin: clamp(1rem, 3vw, 3rem) 0 clamp(5rem, 8vw, 8rem);
}
.process-archive-step {
  min-width: 0;
  padding-top: 1rem;
  border-top: 1px solid var(--ink);
}
.process-archive-step figure {
  margin: 0 0 1.6rem;
  overflow: hidden;
  background: var(--paper-soft);
}
.process-archive-step img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}
.process-archive-step > div > p:first-child {
  margin: 0 0 .8rem;
  color: var(--clay);
  font-size: .67rem;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.process-archive-step > div > p:first-child span {
  display: inline-block;
  width: 2rem;
  font-variant-numeric: tabular-nums;
}
.process-archive-step h2 {
  font-size: clamp(1.65rem, 2.5vw, 2.35rem);
  line-height: 1.12;
}
.process-archive-step > div > p:last-child {
  max-width: 34rem;
  margin: 1rem 0 0;
  color: var(--muted-dark);
  line-height: 1.75;
}

.authority-source-note {
  display: grid;
  grid-template-columns: minmax(10rem, 15rem) minmax(0, 46rem);
  gap: clamp(2.5rem, 6vw, 6rem);
  margin-top: clamp(1rem, 3vw, 3rem);
  padding: clamp(2rem, 4vw, 3.5rem);
  background: var(--paper-soft);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--rule-dark);
}
.authority-source-note > h2 {
  font-size: 1.65rem;
  line-height: 1.15;
}
.authority-source-note p {
  margin: 0;
  color: var(--muted-dark);
  font-size: .91rem;
  line-height: 1.75;
}
.authority-source-note ul {
  display: grid;
  gap: .5rem;
  margin: 1.2rem 0 0;
  padding-left: 1.15rem;
}
.authority-source-note a {
  text-underline-offset: .22em;
  text-decoration-thickness: 1px;
}
.authority-source-note a:hover,
.authority-source-note a:focus-visible { color: var(--clay); }

.authority-related {
  margin-top: clamp(5rem, 9vw, 9rem);
  padding-top: clamp(3rem, 5vw, 5rem);
  border-top: 1px solid var(--ink);
}
.authority-related > h2 {
  max-width: 48rem;
  font-size: clamp(2.75rem, 5vw, 5rem);
  line-height: .98;
}
.authority-related-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: clamp(2.5rem, 5vw, 4.5rem);
  border-top: 1px solid var(--rule-dark);
}
.authority-related-grid a {
  min-height: 10rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 2rem;
  padding: 1.5rem;
  text-decoration: none;
  border-bottom: 1px solid var(--rule-dark);
}
.authority-related-grid a + a { border-left: 1px solid var(--rule-dark); }
.authority-related-grid span {
  color: var(--clay);
  font-size: .67rem;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.authority-related-grid strong {
  max-width: 27rem;
  font-family: var(--serif);
  font-size: clamp(1.35rem, 2.2vw, 2rem);
  font-weight: 400;
  line-height: 1.2;
}
.authority-related-grid a:hover,
.authority-related-grid a:focus-visible {
  color: var(--light);
  background: var(--ink);
}
.authority-related-grid a:hover span,
.authority-related-grid a:focus-visible span { color: var(--light); }

.authority-body--compact {
  padding-top: clamp(2.5rem, 5vw, 4rem);
  padding-bottom: clamp(3rem, 6vw, 5rem);
}
.authority-related--compact {
  margin-top: 0;
  padding-top: clamp(2rem, 3vw, 3rem);
}
.authority-related--compact > h2 {
  max-width: 36rem;
  font-size: clamp(2rem, 3.4vw, 3.25rem);
  line-height: 1.05;
}
.authority-related--compact .authority-related-grid {
  margin-top: clamp(1.5rem, 3vw, 2.5rem);
}
.authority-related--compact .authority-related-grid a {
  min-height: 6rem;
  gap: 1rem;
  padding: 1rem;
}
.authority-related--compact .authority-related-grid strong {
  font-size: clamp(1.15rem, 1.8vw, 1.5rem);
}

.authority-footer .footer-statement {
  max-width: 74rem;
  font-size: clamp(3.4rem, 6vw, 6.2rem);
}
.authority-footer .footer-row > p { max-width: 36rem; }
.authority-footer :where(a, button):focus-visible {
  color: var(--light);
  outline-color: var(--light);
}

body[data-language="zh"] .authority-hero h1,
body[data-language="zh"] .authority-section > h2,
body[data-language="zh"] .authority-source-note > h2,
body[data-language="zh"] .authority-related > h2,
body[data-language="zh"] .process-archive-step h2,
body[data-language="zh"] .credential-timeline h3,
body[data-language="zh"] .credential-card figcaption strong {
  font-family: "STSong", "Songti SC", "Noto Serif CJK SC", "SimSun", serif;
  letter-spacing: .01em;
}
body[data-language="zh"] .authority-hero h1 {
  font-size: clamp(3.8rem, 5.8vw, 5.8rem);
  line-height: 1.05;
}
body[data-language="zh"] .authority-lede,
body[data-language="zh"] .authority-section-copy,
body[data-language="zh"] .credential-timeline p,
body[data-language="zh"] .process-archive-step > div > p:last-child,
body[data-language="zh"] .authority-source-note p { line-height: 1.9; }

/* Chinese uses a separate typographic rhythm instead of inheriting English display metrics. */
body[data-language="zh"] {
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  line-break: strict;
}
body[data-language="zh"] .hero h1,
body[data-language="zh"] .section-heading h2,
body[data-language="zh"] .process h2,
body[data-language="zh"] .trace h2,
body[data-language="zh"] .record > h2,
body[data-language="zh"] .use-copy h2,
body[data-language="zh"] .footer-statement,
body[data-language="zh"] .detail-copy h2,
body[data-language="zh"] .detail-study-heading h2,
body[data-language="zh"] .detail-record-intro h2 {
  font-family: "STSong", "Songti SC", "Noto Serif CJK SC", "SimSun", serif;
  letter-spacing: .015em;
  line-height: 1.08;
}
body[data-language="zh"] .hero h1 { font-size: clamp(4rem, 4.5vw, 5rem); }
body[data-language="zh"] .section-heading h2 { font-size: clamp(4rem, 6.2vw, 6.8rem); }
body[data-language="zh"] .process h2 { font-size: clamp(3.8rem, 4.7vw, 5.1rem); }
body[data-language="zh"] .hero-copy > p,
body[data-language="zh"] .section-heading p,
body[data-language="zh"] .maker-copy > p:not(.index-label),
body[data-language="zh"] .use-copy p,
body[data-language="zh"] .featured-copy > p:not(.index-label),
body[data-language="zh"] .detail-copy > p:not(.index-label),
body[data-language="zh"] .detail-record-intro > p:last-child { line-height: 1.8; }
body[data-language="zh"] .hero-copy > p { text-wrap: balance; }
body[data-language="zh"] .desktop-nav a,
body[data-language="zh"] .language-toggle,
body[data-language="zh"] .text-link,
body[data-language="zh"] .back-link { letter-spacing: .08em; }
body[data-language="zh"] .form-meta h3 span {
  font-family: "STSong", "Songti SC", "SimSun", serif;
  color: var(--ink);
  letter-spacing: .06em;
}
body[data-language="zh"] .measure { letter-spacing: .06em; line-height: 1.5; }
body[data-language="zh"] .catalog-hero h1 { font-family: "STSong", "Songti SC", "SimSun", serif; font-size: clamp(4.8rem, 8vw, 8rem); letter-spacing: .02em; line-height: 1; }
body[data-language="zh"] .catalog-intro,
body[data-language="zh"] .catalog-card h2,
body[data-language="zh"] .catalog-footer p { font-family: "STSong", "Songti SC", "SimSun", serif; }
body[data-language="zh"] .catalog-tools p { letter-spacing: .08em; }
body[data-language="zh"] .studio-heading h3 { font-family: "STSong", "Songti SC", "SimSun", serif; letter-spacing: .02em; line-height: 1.08; }
body[data-language="zh"] .studio-heading > p:last-child { line-height: 1.8; }

@media (max-width: 1100px) {
  .site-header { grid-template-columns: 1fr 1fr; }
  .desktop-nav { display: none; }
  .header-actions { grid-column: 2; }
  .hero-copy { width: min(42rem, 60vw); }
  .hero h1 { font-size: clamp(3.7rem, 6.7vw, 6rem); }
  body[data-language="zh"] .hero h1 { font-size: clamp(3.7rem, 5.8vw, 4.6rem); }
  .forms-display { grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
  .form-meta { grid-template-columns: 1.8rem 1fr; }
  .process-grid { grid-template-columns: .9fr 1.1fr; gap: 3rem; }
  .process-tabs button { flex-direction: column; gap: .15rem; }
  .detail-hero { grid-template-columns: .85fr 1.15fr; }
  .catalog-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 761px) {
  .hero { min-height: 94svh; align-items: start; }
  .hero-copy { width: min(62rem, 58vw); padding-top: 8rem; }
  .hero h1 span { white-space: nowrap; }
}

@media (max-width: 760px) {
  :root { --gutter: 1.5rem; }
  .site-header { min-height: 5rem; padding-top: 1.25rem; padding-bottom: 1.25rem; }
  .brand { gap: .7rem; }
  .brand-cn { font-size: 1.25rem; }
  .brand-en { font-size: .82rem; }
  .header-viewing { display: none; }
  .header-actions { gap: 1.2rem; }
  .header-actions { position: relative; z-index: 41; }
  .language-toggle { font-size: .66rem; }
  .menu-toggle { display: block; }
  .detail-page .menu-toggle { display: none; }
  .mobile-nav {
    position: fixed;
    inset: 0;
    z-index: -1;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 1.4rem;
    padding: 7rem var(--gutter) 4rem;
    color: var(--light);
    background: var(--ink);
    opacity: 0;
    visibility: hidden;
    transition: opacity .28s ease, visibility .28s ease;
  }
  .mobile-nav a,
  .mobile-nav > button { font-family: var(--serif); font-size: 2.8rem; line-height: 1; text-decoration: none; text-transform: none; letter-spacing: -.03em; }
  .mobile-nav > button { border: 0; }
  .menu-open .mobile-nav { z-index: 40; opacity: 1; visibility: visible; }
  .menu-open .menu-toggle span:nth-child(1) { transform: translateY(.42rem) rotate(45deg); }
  .menu-open .menu-toggle span:nth-child(2) { opacity: 0; }
  .menu-open .menu-toggle span:nth-child(3) { transform: translateY(-.42rem) rotate(-45deg); }

  .hero { min-height: 100svh; align-items: start; padding-top: 8.5rem; padding-bottom: 2rem; }
  .hero-media,
  .hero-slide {
    inset: 0;
    width: 100%;
    max-width: 100%;
    height: 100%;
  }
  .hero-slide {
    object-fit: cover;
    object-position: var(--hero-mobile-position, 58% center);
  }
  .hero-shade { background: linear-gradient(180deg, rgba(8, 7, 6, .86) 0%, rgba(8, 7, 6, .56) 49%, rgba(8, 7, 6, .18) 78%); }
  .hero-copy { width: 100%; padding-top: 0; }
  .hero h1 { max-width: 24rem; font-size: clamp(3.65rem, 15vw, 5.5rem); line-height: .94; }
  .hero-copy > p { width: min(21rem, 86%); margin: 1.7rem 0 1.8rem; font-size: .92rem; }
  .hero-index { display: none; }
  .hero-carousel-controls { right: var(--gutter); bottom: 1rem; left: var(--gutter); }
  .hero-carousel-button { flex: 1; width: auto; max-width: 4.5rem; }

  .forms { padding-top: 5.5rem; }
  .section-heading { grid-template-columns: 1fr; gap: 1.5rem; margin-bottom: 2rem; }
  .section-heading h2 { font-size: clamp(3.6rem, 16vw, 5.2rem); }
  .section-heading p { margin: 0; }
  .forms-display { grid-template-columns: 1fr; gap: 0; }
  .form-item { display: grid; grid-template-columns: 44% 56%; align-items: center; padding: 1.5rem 0; border-top: 1px solid var(--rule-dark); }
  .form-image { aspect-ratio: 3 / 2; border: 0; }
  .form-meta { min-width: 0; grid-template-columns: 1.55rem minmax(0, 1fr); padding: 0 0 0 .65rem; }
  .form-meta h3 { font-size: 1.42rem; line-height: 1; white-space: nowrap; overflow-wrap: normal; }
  .form-meta h3 span { display: block; margin-top: .35rem; white-space: normal; }
  .form-meta div > p:not(.measure) { display: none; }
  .form-meta .text-link { margin-top: 1.3rem; }
  .catalog-entry { justify-content: flex-start; margin-top: 2.25rem; }

  .process { padding-top: 5.5rem; padding-bottom: 5.5rem; }
  .process-grid { grid-template-columns: 1fr; gap: 3rem; }
  .process h2 { font-size: clamp(3.8rem, 16vw, 5.2rem); }
  .process-lede { margin: 1.5rem 0 2.5rem; }
  .process-tabs button { font-size: .6rem; }
  .process-tabs button span:first-child { display: none; }
  .process-figure { order: -1; margin: 0 calc(var(--gutter) * -1); }
  .process-figure img { aspect-ratio: 1 / .85; object-position: center; }

  .trace { min-height: 34rem; }
  .trace-image { background-size: 380% auto; background-position: 51% 62%; }
  .trace-copy { grid-template-columns: 1fr; padding-bottom: 2.5rem; }
  .trace h2 { font-size: 3.7rem; }
  .trace p { margin: 0; }

  .record { padding-top: 5.5rem; padding-bottom: 5.5rem; }
  .record > h2 { font-size: 3.8rem; }
  .record-grid { grid-template-columns: 1fr; gap: 2rem; margin-top: 2.5rem; }
  .record-product { margin: 0 calc(var(--gutter) * -1); }
  .record-product img { aspect-ratio: 1 / .74; }
  .maker-portrait { margin: 0; }
  .maker-portrait img { aspect-ratio: 4 / 5; }
  .studio-archive { margin-top: 4.5rem; padding-top: 3rem; }
  .studio-heading { grid-template-columns: 1fr; gap: 1.2rem; margin-bottom: 2rem; }
  .studio-heading h3 { font-size: 3.4rem; }
  .studio-heading > p:last-child { margin: 0; }
  .studio-grid { grid-template-columns: 1fr; grid-template-rows: none; gap: 1rem; }
  .studio-frame-tall { grid-row: auto; }
  .studio-frame img { height: auto; aspect-ratio: 4 / 3; }
  .studio-frame-tall img { aspect-ratio: 4 / 5; }

  .in-use { min-height: 45rem; align-items: start; padding-top: 3.5rem; }
  .in-use > img { object-position: 68% center; }
  .use-shade { background: linear-gradient(180deg, rgba(232, 225, 213, .94) 0%, rgba(232, 225, 213, .58) 42%, rgba(232, 225, 213, .06) 76%); }
  .use-copy { width: calc(100% - 3rem); margin: 0 var(--gutter); }
  .use-copy h2 { max-width: 18rem; font-size: 3.7rem; }
  .use-copy p { max-width: 16rem; font-size: .92rem; }

  .featured { grid-template-columns: 1fr; padding-top: 5.5rem; }
  .featured-copy { padding: 0; }
  .featured-copy h2 { font-size: 3.55rem; white-space: nowrap; overflow-wrap: normal; }
  .featured-image { margin: 2rem calc(var(--gutter) * -1) 0; }
  .featured-image img { min-height: 24rem; aspect-ratio: 1 / .75; }
  .spec-rail { grid-template-columns: 1fr 1fr; }
  .spec-rail li:nth-child(2) { border-right: 0; }
  .spec-rail li:nth-child(-n+2) { border-bottom: 1px solid var(--rule-dark); }

  .site-footer { padding-top: 5rem; }
  .footer-statement { font-size: clamp(3.5rem, 15vw, 5rem); }
  .footer-row { grid-template-columns: 1fr; align-items: start; gap: 2rem; margin-top: 5rem; }
  .footer-row > p { margin: 0; }
  .footer-row > .text-link { justify-self: start; }

  .detail-header { grid-template-columns: 1fr auto auto; gap: .8rem; }
  .detail-header .back-link { display: none; }
  .detail-header .header-actions { grid-column: auto; }
  .detail-hero { grid-template-columns: 1fr; min-height: auto; padding-top: 8rem; }
  .detail-copy { min-width: 0; padding-right: 0; }
  .detail-copy h1 { font-size: 3.55rem; white-space: nowrap; }
  .detail-copy h2 { margin-top: 2rem; }
  .detail-hero-image { margin: 2.5rem calc(var(--gutter) * -1) 0; }
  .detail-hero-image img { min-height: 20rem; aspect-ratio: 1 / .82; object-fit: contain; }
  .detail-study { padding-top: 5.5rem; padding-bottom: 5.5rem; }
  .detail-study-heading { grid-template-columns: 1fr; gap: 1.5rem; }
  .detail-study-heading h2 { font-size: 3.8rem; }
  .detail-study-heading p { margin: 0; }
  .study-grid { grid-template-columns: 1fr; }
  .study { min-height: 28rem; }
  .detail-record { grid-template-columns: 1fr; gap: 3rem; padding-top: 5.5rem; padding-bottom: 5.5rem; }
  .detail-record-intro h2 { font-size: 3.7rem; }

  .catalog-header { grid-template-columns: 1fr auto; }
  .catalog-header .back-link { display: none; }
  .catalog-hero { padding-top: 8.5rem; padding-bottom: 2.5rem; }
  .catalog-hero-grid { grid-template-columns: 1fr; gap: 2rem; }
  .catalog-hero h1 { font-size: clamp(4rem, 17vw, 5.4rem); line-height: .88; }
  .catalog-intro { font-size: 1.2rem; }
  .catalog-tools { grid-template-columns: 1fr; gap: 1rem; margin-top: 2.75rem; }
  .catalog-content { padding-top: 2rem; }
  .catalog-pagination {
    grid-template-columns: 1fr;
    gap: 1rem;
    padding: 1rem 0 1.25rem;
  }
  .catalog-pagination--top { margin-bottom: 2.5rem; }
  .catalog-pagination--bottom { margin-top: 3.5rem; }
  .catalog-pagination-summary { justify-content: space-between; }
  .catalog-pagination-summary strong { font-size: 1.25rem; }
  .catalog-pagination-controls {
    grid-template-columns: 1fr 1fr;
    gap: .65rem;
  }
  .catalog-page-step { width: 100%; min-width: 0; min-height: 3rem; }
  .catalog-page-numbers {
    grid-column: 1 / -1;
    grid-row: 2;
    justify-content: space-between;
    gap: .25rem;
  }
  .catalog-page-number { width: min(2.5rem, 11.5vw); min-height: 2.5rem; }
  .catalog-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2.5rem .9rem; }
  .catalog-card-meta { grid-template-columns: 1fr; gap: .35rem; }
  .catalog-code { order: 2; margin: 0; font-size: .58rem; }
  .catalog-card h2 { font-size: 1.05rem; }
  .catalog-footer { align-items: flex-start; flex-direction: column; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 1rem; margin-top: 1.5rem; }
  .mobile-contact-bar { position: fixed; z-index: 35; right: 1rem; bottom: 1rem; display: block; padding: .85rem 1rem; color: var(--light); background: var(--clay); text-decoration: none; font-size: .66rem; letter-spacing: .1em; }

  .catalog-page .brand,
  .detail-page .brand,
  .lead-page .brand,
  .catalog-footer .text-link,
  .detail-page .site-footer .text-link,
  .lead-page .commerce-footer a,
  .lead-page .lead-consent a {
    display: inline-flex;
    align-items: center;
    min-height: 2.75rem;
  }
  .catalog-page .language-toggle,
  .detail-page .language-toggle,
  .lead-page .language-toggle {
    min-width: 2.75rem;
    min-height: 2.75rem;
    padding: .5rem;
  }
  .catalog-page-number {
    width: 2.75rem;
    min-width: 2.75rem;
    min-height: 2.75rem;
  }
  .catalog-page-numbers {
    flex-wrap: wrap;
    justify-content: center;
  }
  .catalog-add {
    min-height: 2.75rem;
    padding: .65rem 0;
  }
  .catalog-lightbox .lightbox-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.75rem;
    min-height: 2.75rem;
    padding: .5rem;
  }

  body[data-language="zh"] .hero h1 {
    max-width: none;
    font-size: clamp(3.1rem, 12vw, 3.55rem);
    line-height: 1.04;
    letter-spacing: .015em;
  }
  body[data-language="zh"] .hero h1 span { white-space: nowrap; }
  body[data-language="zh"] .hero h1 span + span { margin-top: .08em; }
  body[data-language="zh"] .hero-copy > p { width: 100%; max-width: 22rem; margin-top: 1.35rem; }
  body[data-language="zh"] .section-heading h2 { font-size: clamp(3.2rem, 12.5vw, 3.75rem); line-height: 1.08; }
  body[data-language="zh"] .form-meta h3 { font-size: 1.36rem; }
  body[data-language="zh"] .form-meta h3 span { font-size: .74em; margin-top: .42rem; }
  body[data-language="zh"] .process h2,
  body[data-language="zh"] .record > h2 { font-size: clamp(3rem, 11.5vw, 3.35rem); line-height: 1.1; }
  body[data-language="zh"] .trace h2 { font-size: 3.15rem; line-height: 1.1; }
  body[data-language="zh"] .use-copy h2 { max-width: 19rem; font-size: 3.15rem; line-height: 1.12; }
  body[data-language="zh"] .footer-statement { font-size: clamp(3rem, 11.5vw, 3.4rem); line-height: 1.12; }
  body[data-language="zh"] .detail-copy h2 { font-size: 1.72rem; line-height: 1.45; }
  body[data-language="zh"] .detail-study-heading h2,
  body[data-language="zh"] .detail-record-intro h2 { font-size: 3.1rem; line-height: 1.12; }
  body[data-language="zh"] .catalog-hero h1 { font-size: clamp(3.6rem, 15vw, 4.5rem); line-height: 1.05; }
  body[data-language="zh"] .catalog-intro { font-size: 1.15rem; line-height: 1.75; }
}

@media (max-width: 360px) {
  :root { --gutter: 1rem; }
  .site-header { grid-template-columns: minmax(0, 1fr) auto; gap: .75rem; }
  .header-actions { grid-column: auto; gap: .75rem; }
  .hero { grid-template-columns: minmax(0, 1fr); }
  .hero-copy { min-width: 0; }
  body[data-language="zh"] .hero h1 { font-size: 2.62rem; }
}

@media (max-width: 1100px) {
  .authority-header { grid-template-columns: 1fr auto 1fr; }
  .authority-nav { display: flex; }
  .authority-header .header-actions { grid-column: auto; }
  .authority-hero-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(15rem, .65fr);
    gap: 3rem;
  }
}

@media (max-width: 760px) {
  .authority-header {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 1rem;
  }
  .authority-nav { display: none; }
  .authority-header .header-actions { grid-column: auto; }
  .authority-header .language-toggle {
    min-width: 2.75rem;
    min-height: 2.75rem;
    padding: .5rem;
  }
  .authority-page .brand,
  .authority-footer .text-link {
    min-height: 2.75rem;
    align-items: center;
  }
  .authority-hero {
    padding-top: 8rem;
    padding-bottom: 4.5rem;
  }
  .authority-hero-grid {
    grid-template-columns: 1fr;
    gap: 3.5rem;
  }
  .authority-hero h1 {
    font-size: clamp(3rem, 13vw, 4.35rem);
    line-height: .98;
  }
  body[data-language="zh"] .authority-hero h1 {
    font-size: clamp(3rem, 12vw, 3.7rem);
    line-height: 1.08;
  }
  .authority-lede {
    margin-top: 1.75rem;
    font-size: 1.14rem;
    line-height: 1.7;
  }
  .authority-actions {
    display: grid;
    grid-template-columns: 1fr;
    align-items: stretch;
    margin-top: 2rem;
  }
  .authority-primary,
  .authority-secondary {
    width: 100%;
    min-height: 2.75rem;
  }
  .form-register {
    padding: 2.5rem 0 0;
    border-top: 1px solid var(--rule-dark);
    border-left: 0;
  }
  .form-register-diagram { width: min(100%, 17rem); }
  .form-register figcaption { max-width: 26rem; }
  .authority-body {
    width: calc(100% - (2 * var(--gutter)));
    padding-top: 3rem;
    padding-bottom: 6rem;
  }
  .authority-section {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding: 3rem 0;
  }
  .authority-section > h2 { font-size: 2.35rem; }
  .authority-section-copy { font-size: .98rem; }
  .credential-timeline li {
    grid-template-columns: 1fr;
    gap: .65rem;
    padding: 1.5rem 0;
  }
  .credential-timeline time { font-size: 1.2rem; }
  .authority-section--media .credential-grid { grid-column: auto; }
  .credential-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
    margin-top: .5rem;
  }
  .process-archive-grid {
    grid-template-columns: 1fr;
    gap: 3.5rem;
    margin-top: 1rem;
    margin-bottom: 5rem;
  }
  .process-archive-step h2 { font-size: 2rem; }
  .authority-source-note {
    grid-template-columns: 1fr;
    gap: 1rem;
    padding: 1.5rem;
  }
  .authority-source-note ul { gap: .35rem; }
  .authority-source-note li { min-height: 2.75rem; }
  .authority-source-note a {
    display: inline-flex;
    align-items: center;
    min-height: 2.75rem;
  }
  .authority-related { margin-top: 5rem; }
  .authority-body--compact { padding-top: 2.5rem; padding-bottom: 3rem; }
  .authority-related--compact { margin-top: 0; }
  .authority-related.authority-related--compact > h2 { font-size: 2rem; }
  .authority-related--compact .authority-related-grid { margin-top: 1.5rem; }
  .authority-related--compact .authority-related-grid a { min-height: 5.5rem; padding: 1rem 0; }
  .authority-related > h2 {
    font-size: 2.8rem;
    line-height: 1.05;
  }
  .authority-related-grid {
    grid-template-columns: 1fr;
    margin-top: 2.5rem;
  }
  .authority-related-grid a {
    min-height: 8rem;
    padding: 1.25rem 0;
  }
  .authority-related-grid a + a { border-left: 0; }
  .authority-related-grid strong { font-size: 1.45rem; }
  .credential-media { min-height: 2.75rem; }
  .authority-footer .footer-statement {
    font-size: clamp(3rem, 13vw, 4.2rem);
    line-height: 1.04;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
  .site-intro { opacity: 0; visibility: hidden; }
  .reveal { opacity: 1; transform: none; }
  .hero-slide { transform: none; }
}