:root {
  --ink: #080909;
  --ink-soft: #151717;
  --paper: #ece8df;
  --paper-bright: #f6f3ec;
  --silver: #bfc2bf;
  --muted: #8e918f;
  --amber: #f08a24;
  --line-dark: rgba(8, 9, 9, 0.2);
  --line-light: rgba(255, 255, 255, 0.2);
  --header-height: 78px;
  --gutter: clamp(1.25rem, 4vw, 4.5rem);
  --serif: "Noto Serif SC", "Songti SC", "STSong", serif;
  --sans: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--ink); }
body {
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}
body.menu-open { overflow: hidden; }
img { display: block; width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }
button { cursor: pointer; }

.skip-link {
  position: fixed;
  z-index: 200;
  left: 1rem;
  top: 1rem;
  padding: 0.75rem 1rem;
  background: var(--paper-bright);
  color: var(--ink);
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }

:focus-visible {
  outline: 3px solid var(--amber);
  outline-offset: 4px;
}

.site-header {
  position: fixed;
  z-index: 100;
  inset: 0 0 auto 0;
  height: var(--header-height);
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line-light);
  background: linear-gradient(to bottom, rgba(8, 9, 9, 0.92), rgba(8, 9, 9, 0.46));
  transition: background-color 220ms ease, height 220ms ease;
}
.site-header.is-scrolled {
  height: 66px;
  background: rgba(8, 9, 9, 0.96);
}
.brand { position: relative; z-index: 102; display: inline-flex; align-items: center; gap: 0.8rem; min-height: 44px; }
.brand-mark { width: 38px; height: 38px; flex: none; }
.brand-copy { display: grid; gap: 0.16rem; }
.brand-copy strong { font-size: 0.88rem; letter-spacing: 0.08em; }
.brand-copy small { color: var(--silver); font: 0.58rem/1.2 var(--mono); letter-spacing: 0.12em; }
.site-nav { display: flex; align-items: center; gap: clamp(1rem, 2.5vw, 2.6rem); }
.site-nav a {
  position: relative;
  padding: 0.8rem 0;
  color: rgba(246, 243, 236, 0.8);
  font-size: 0.82rem;
}
.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0.38rem;
  height: 1px;
  background: var(--amber);
  transition: right 220ms ease;
}
.site-nav a:hover::after, .site-nav a:focus-visible::after { right: 0; }
.menu-toggle { display: none; }

.hero {
  position: relative;
  min-height: max(760px, 100svh);
  overflow: hidden;
  isolation: isolate;
}
.hero-media, .hero-shade { position: absolute; inset: 0; }
.hero-media img { height: 100%; object-fit: cover; object-position: center; }
.hero-shade {
  background:
    linear-gradient(90deg, rgba(8,9,9,0.93) 0%, rgba(8,9,9,0.74) 34%, rgba(8,9,9,0.12) 70%),
    linear-gradient(0deg, rgba(8,9,9,0.82) 0%, transparent 28%);
}
.hero-grid {
  position: relative;
  z-index: 1;
  min-height: max(760px, 100svh);
  padding: calc(var(--header-height) + clamp(4rem, 10vh, 8rem)) var(--gutter) 8.5rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(230px, 0.34fr);
  align-items: center;
  gap: 3rem;
}
.eyebrow, .section-number, .chapter, .signal {
  margin: 0;
  font: 600 0.7rem/1.4 var(--mono);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.eyebrow { display: flex; align-items: center; gap: 0.85rem; color: var(--silver); }
.eyebrow::before { content: ""; width: 2.4rem; height: 2px; background: var(--amber); }
.hero h1 {
  margin: 1.4rem 0 1.6rem;
  max-width: 830px;
  font-family: var(--serif);
  font-size: clamp(4.4rem, 10vw, 9.8rem);
  font-weight: 800;
  line-height: 0.9;
  letter-spacing: -0.08em;
}
.hero h1 span { color: var(--amber); }
.hero-lede { max-width: 580px; margin: 0 0 2rem; color: rgba(246,243,236,0.76); font-size: clamp(1rem, 1.45vw, 1.25rem); line-height: 1.85; }
.text-link {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 1rem;
  border-bottom: 1px solid currentColor;
  font-size: 0.84rem;
  letter-spacing: 0.08em;
}
.text-link span { color: var(--amber); font-size: 1.1rem; transition: transform 180ms ease; }
.text-link:hover span { transform: translate(0.2rem, 0.2rem); }
.text-link--dark { color: var(--ink); }
.hero-index { align-self: end; border-left: 1px solid var(--line-light); padding-left: 1.4rem; display: grid; grid-template-columns: 2rem 1fr; gap: 1.15rem 0.8rem; }
.hero-index span { color: var(--amber); font: 0.62rem/1.5 var(--mono); }
.hero-index strong { font-size: 0.78rem; font-weight: 500; color: rgba(246,243,236,0.72); }
.hero-bottom {
  position: absolute;
  z-index: 2;
  inset: auto var(--gutter) 2rem;
  display: grid;
  grid-template-columns: auto 1fr auto 1fr auto;
  align-items: center;
  gap: 1rem;
  color: rgba(246,243,236,0.62);
  font: 0.62rem/1.4 var(--mono);
  letter-spacing: 0.16em;
}
.hero-bottom i { height: 1px; background: var(--line-light); }

.section-heading {
  display: grid;
  grid-template-columns: minmax(9rem, 0.3fr) minmax(320px, 1fr) minmax(250px, 0.48fr);
  gap: 2.5rem;
  padding: clamp(5rem, 9vw, 9rem) var(--gutter);
  align-items: end;
}
.section-heading--light { background: var(--paper-bright); color: var(--ink); }
.section-heading--dark { color: var(--paper); }
.section-number { align-self: start; color: var(--amber); }
.section-heading--light .section-number,
.business-story--quartz .chapter,
.research .section-number,
.journey .section-number,
.contact .section-number { color: #8a4200; }
.section-heading h2, .research h2, .sustainability h2, .contact h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(3rem, 7vw, 7rem);
  line-height: 0.98;
  letter-spacing: -0.07em;
}
.section-heading > p:last-child { margin: 0; color: #4e5250; line-height: 1.85; }
.section-heading--dark > p:last-child { color: rgba(246,243,236,0.66); }

.business-story { min-height: 720px; display: grid; grid-template-columns: 1.16fr 0.84fr; }
.business-story figure { margin: 0; min-height: 620px; overflow: hidden; }
.business-story figure img { height: 100%; object-fit: cover; transition: transform 800ms cubic-bezier(.16,1,.3,1); }
.business-story:hover figure img { transform: scale(1.025); }
.business-copy { padding: clamp(4rem, 8vw, 8.5rem) var(--gutter); display: flex; flex-direction: column; justify-content: center; align-items: flex-start; }
.business-copy h3 { margin: 1.1rem 0 1.5rem; font: 800 clamp(3.7rem, 7.5vw, 8.2rem)/0.9 var(--serif); letter-spacing: -0.075em; }
.business-copy p { max-width: 34rem; margin: 0 0 2rem; font-size: 1rem; line-height: 1.9; }
.chapter { color: var(--amber); }
.business-story--quartz { background: var(--paper); color: var(--ink); }
.business-story--alloy { grid-template-columns: 0.84fr 1.16fr; background: var(--ink-soft); color: var(--paper); }
.business-story--alloy .business-copy p { color: rgba(246,243,236,0.68); }

.process { padding-bottom: clamp(5rem, 9vw, 9rem); background: var(--ink); }
.process-gallery {
  padding: 0 var(--gutter) clamp(5rem, 9vw, 8rem);
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1rem;
  align-items: start;
}
.process-frame { margin: 0; border-left: 1px solid var(--line-light); padding-left: 1rem; }
.process-frame img { height: clamp(290px, 42vw, 620px); object-fit: cover; filter: saturate(0.88); }
.process-frame figcaption { display: flex; gap: 1rem; margin-top: 1rem; font-size: 0.8rem; letter-spacing: 0.08em; }
.process-frame figcaption span { color: var(--amber); font-family: var(--mono); }
.process-frame--feed { grid-column: 1 / span 4; margin-top: 9rem; }
.process-frame--heat { grid-column: 5 / span 5; }
.process-frame--cast { grid-column: 10 / span 3; margin-top: 15rem; }
.process-rail {
  list-style: none;
  margin: 0 var(--gutter);
  padding: 0;
  border-top: 1px solid var(--line-light);
  border-bottom: 1px solid var(--line-light);
  display: grid;
  grid-template-columns: repeat(5, 1fr);
}
.process-rail li { min-height: 190px; padding: 1.4rem; border-right: 1px solid var(--line-light); }
.process-rail li:last-child { border-right: 0; }
.process-rail span { display: block; color: var(--amber); margin-bottom: 3rem; font: 0.68rem/1 var(--mono); }
.process-rail strong { font: 700 1.15rem/1.3 var(--serif); }
.process-rail p { margin: 0.5rem 0 0; color: rgba(246,243,236,0.56); font-size: 0.76rem; line-height: 1.6; }

.research { display: grid; grid-template-columns: 1.25fr 0.75fr; min-height: 780px; background: var(--paper-bright); color: var(--ink); }
.research-image { overflow: hidden; }
.research-image img { height: 100%; object-fit: cover; object-position: 55% center; }
.research-copy { padding: clamp(4rem, 7vw, 8rem) var(--gutter); display: flex; flex-direction: column; justify-content: center; align-items: flex-start; }
.research h2 { margin: 1.3rem 0 2rem; font-size: clamp(3.2rem, 6vw, 6.7rem); }
.research .lead { margin: 0; max-width: 38rem; font-size: 1.05rem; line-height: 1.9; }
.research-note { margin: 3rem 0; padding: 1.35rem 0; width: 100%; border-top: 1px solid var(--line-dark); border-bottom: 1px solid var(--line-dark); display: grid; grid-template-columns: 8rem 1fr; gap: 1rem; }
.research-note span { color: #5d625f; font: 0.7rem/1.6 var(--mono); letter-spacing: 0.12em; }
.research-note p { margin: 0; line-height: 1.7; }

.sustainability { position: relative; min-height: 880px; overflow: hidden; display: grid; align-items: center; }
.sustainability-media, .sustainability-shade { position: absolute; inset: 0; height: 100%; }
.sustainability-media { object-fit: cover; object-position: center; }
.sustainability-shade { background: linear-gradient(90deg, rgba(8,9,9,0.9), rgba(8,9,9,0.55) 45%, rgba(8,9,9,0.06) 80%); }
.sustainability-copy { position: relative; z-index: 1; padding: 8rem var(--gutter); max-width: 880px; }
.sustainability h2 { margin: 1.2rem 0 2rem; }
.sustainability-copy > p:not(.section-number) { max-width: 590px; color: rgba(246,243,236,0.76); line-height: 1.9; }
.signal { display: inline-block; margin-top: 2.5rem; padding-top: 1rem; border-top: 1px solid var(--amber); color: var(--paper); }

.journey { background: var(--paper-bright); color: var(--ink); }
.journey .section-heading { padding-bottom: 5rem; }
.timeline { list-style: none; margin: 0; padding: 0 var(--gutter) clamp(6rem, 10vw, 10rem); }
.timeline li { display: grid; grid-template-columns: minmax(8rem, 0.28fr) 1fr; min-height: 180px; padding: 2rem 0; border-top: 1px solid var(--line-dark); align-items: start; }
.timeline li:last-child { border-bottom: 1px solid var(--line-dark); }
.timeline time { font: 700 clamp(2.8rem, 5vw, 5.8rem)/1 var(--serif); letter-spacing: -0.06em; color: #6b706c; }
.timeline div { display: grid; grid-template-columns: minmax(12rem, 0.4fr) 1fr; gap: 2rem; padding-top: 0.5rem; }
.timeline strong { font: 700 1.35rem/1.3 var(--serif); }
.timeline p { margin: 0; max-width: 46rem; color: #545956; line-height: 1.85; }

.contact { background: var(--paper); color: var(--ink); display: grid; grid-template-columns: 0.8fr 1.2fr; gap: clamp(3rem, 8vw, 9rem); padding: clamp(6rem, 10vw, 10rem) var(--gutter); }
.contact h2 { margin: 1.2rem 0 2rem; font-size: clamp(3.5rem, 6.6vw, 7rem); }
.contact-intro > p:not(.section-number) { max-width: 38rem; color: #4e5350; line-height: 1.9; }
.contact dl { margin: 3rem 0 0; }
.contact dl div { display: grid; grid-template-columns: 5rem 1fr; gap: 1rem; padding: 1rem 0; border-top: 1px solid var(--line-dark); }
.contact dl div:last-child { border-bottom: 1px solid var(--line-dark); }
.contact dt { color: #505552; font-size: 0.72rem; }
.contact dd { margin: 0; line-height: 1.6; }
.inquiry-form { align-self: center; border-top: 1px solid var(--ink); padding-top: 1.4rem; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
.inquiry-form label { display: grid; gap: 0.7rem; margin-bottom: 1.4rem; font-size: 0.72rem; letter-spacing: 0.08em; }
.inquiry-form input, .inquiry-form textarea {
  width: 100%;
  border: 0;
  border-bottom: 1px solid rgba(8,9,9,0.38);
  border-radius: 0;
  background: transparent;
  color: var(--ink);
  min-height: 50px;
  padding: 0.7rem 0;
  resize: vertical;
}
.inquiry-form textarea { min-height: 120px; }
.inquiry-form input:focus, .inquiry-form textarea:focus { outline: 0; border-color: var(--amber); box-shadow: 0 2px 0 var(--amber); }
.inquiry-form button {
  min-width: 190px;
  min-height: 54px;
  border: 1px solid var(--ink);
  border-radius: 0;
  padding: 0 1.4rem;
  background: var(--ink);
  color: var(--paper);
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  transition: background-color 180ms ease, color 180ms ease;
}
.inquiry-form button:hover { background: var(--amber); color: var(--ink); }
.form-status { min-height: 1.6em; margin: 1rem 0 0; color: #8a3d00; font-size: 0.84rem; line-height: 1.6; }

.site-footer { min-height: 210px; padding: 3rem var(--gutter); display: flex; align-items: center; justify-content: space-between; gap: 3rem; border-top: 1px solid var(--line-light); }
.footer-brand { display: flex; align-items: center; gap: 1.2rem; }
.footer-brand div { display: grid; gap: 0.5rem; }
.footer-brand strong { font-family: var(--serif); font-size: 1.1rem; }
.footer-brand small { color: var(--muted); letter-spacing: 0.1em; }
.footer-meta { display: flex; align-items: center; gap: 2.5rem; color: var(--muted); font-size: 0.72rem; }
.footer-meta a { min-height: 44px; display: inline-flex; align-items: center; color: var(--paper); }

[data-reveal] { opacity: 0; transform: translateY(24px); transition: opacity 700ms cubic-bezier(.16,1,.3,1), transform 700ms cubic-bezier(.16,1,.3,1); }
[data-reveal].is-visible { opacity: 1; transform: none; }

@media (max-width: 1080px) {
  .section-heading { grid-template-columns: 8rem 1fr; }
  .section-heading > p:last-child { grid-column: 2; }
  .research { grid-template-columns: 1fr 1fr; }
  .business-story, .business-story--alloy { min-height: 620px; grid-template-columns: 1fr 1fr; }
  .process-frame--feed { grid-column: 1 / span 4; }
  .process-frame--heat { grid-column: 5 / span 4; }
  .process-frame--cast { grid-column: 9 / span 4; }
  .contact { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 860px) {
  :root { --header-height: 68px; }
  .site-header { height: var(--header-height); }
  .menu-toggle {
    position: relative;
    z-index: 102;
    width: 48px;
    height: 48px;
    border: 0;
    background: transparent;
    color: var(--paper);
    display: grid;
    place-content: center;
    gap: 7px;
  }
  .menu-toggle span { width: 24px; height: 1px; background: currentColor; transition: transform 200ms ease; }
  .menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(4px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-4px) rotate(-45deg); }
  .site-nav {
    position: fixed;
    z-index: 101;
    inset: 0;
    padding: 7rem var(--gutter) 3rem;
    background: rgba(8,9,9,0.98);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 0;
    opacity: 0;
    visibility: hidden;
    transition: opacity 180ms ease, visibility 180ms ease;
  }
  .site-nav.is-open { opacity: 1; visibility: visible; }
  .site-nav a { width: 100%; padding: 1rem 0; border-bottom: 1px solid var(--line-light); font: 700 clamp(2rem, 9vw, 4rem)/1.2 var(--serif); }
  .hero-grid { grid-template-columns: 1fr; align-items: end; padding-top: 9rem; }
  .hero-index { align-self: auto; max-width: 390px; }
  .hero h1 { font-size: clamp(4rem, 15vw, 7rem); }
  .section-heading { grid-template-columns: 1fr; gap: 1.5rem; }
  .section-heading > p:last-child { grid-column: auto; max-width: 38rem; }
  .business-story, .business-story--alloy { grid-template-columns: 1fr; }
  .business-story--alloy .business-copy { order: 2; }
  .business-story figure { min-height: 54vw; }
  .process-gallery { grid-template-columns: 1fr; gap: 3rem; }
  .process-frame--feed, .process-frame--heat, .process-frame--cast { grid-column: auto; margin-top: 0; }
  .process-frame img { height: min(68vw, 540px); }
  .process-rail { grid-template-columns: 1fr; }
  .process-rail li { min-height: 120px; border-right: 0; border-bottom: 1px solid var(--line-light); display: grid; grid-template-columns: 3rem minmax(8rem, 0.5fr) 1fr; align-items: center; gap: 1rem; }
  .process-rail li:last-child { border-bottom: 0; }
  .process-rail span, .process-rail p { margin: 0; }
  .research { grid-template-columns: 1fr; }
  .research-image { min-height: 70vw; }
  .timeline li { grid-template-columns: 7rem 1fr; }
  .timeline div { grid-template-columns: 1fr; gap: 0.8rem; }
  .contact { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .brand-copy small { display: none; }
  .hero { min-height: 780px; }
  .hero-media img { object-position: 62% center; }
  .hero-shade { background: linear-gradient(90deg, rgba(8,9,9,0.94), rgba(8,9,9,0.42)), linear-gradient(0deg, rgba(8,9,9,0.9), transparent 52%); }
  .hero-grid { min-height: 780px; padding-bottom: 7rem; }
  .hero h1 { margin-top: 1.1rem; letter-spacing: -0.09em; }
  .hero-index { grid-template-columns: 1.7rem 1fr; gap: 0.8rem 0.6rem; }
  .hero-bottom { grid-template-columns: auto 1fr auto; font-size: 0.54rem; }
  .hero-bottom span:nth-of-type(2), .hero-bottom i:nth-of-type(2) { display: none; }
  .section-heading { padding-top: 5.5rem; padding-bottom: 4rem; }
  .section-heading h2, .research h2, .sustainability h2, .contact h2 { font-size: clamp(2.9rem, 13vw, 4.8rem); }
  .business-copy { padding-top: 4.8rem; padding-bottom: 4.8rem; }
  .business-copy h3 { font-size: clamp(3.4rem, 17vw, 5.8rem); }
  .process-gallery { padding-bottom: 4rem; }
  .process-frame img { height: 78vw; }
  .process-rail li { grid-template-columns: 2.4rem 1fr; }
  .process-rail p { grid-column: 2; }
  .research-image { min-height: 92vw; }
  .research-note { grid-template-columns: 1fr; }
  .sustainability { min-height: 760px; }
  .sustainability-media { object-position: 68% center; }
  .sustainability-shade { background: linear-gradient(90deg, rgba(8,9,9,0.92), rgba(8,9,9,0.32)), linear-gradient(0deg, rgba(8,9,9,0.64), transparent 58%); }
  .timeline li { grid-template-columns: 1fr; gap: 1.2rem; }
  .field-row { grid-template-columns: 1fr; gap: 0; }
  .inquiry-form button { width: 100%; }
  .site-footer { align-items: flex-start; flex-direction: column; }
  .footer-meta { width: 100%; flex-direction: column; align-items: flex-start; gap: 0.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  [data-reveal] { opacity: 1; transform: none; }
}