@font-face {
  font-family: "Smiley Sans";
  src: url("assets/fonts/smiley-sans-display.woff2") format("woff2");
  font-display: swap;
}

@font-face {
  font-family: "Noto Sans SC";
  src: url("assets/fonts/noto-sans-sc-subset.ttf") format("truetype");
  font-display: swap;
}

:root {
  --furnace: #15110e;
  --furnace-soft: #211a16;
  --paper: #ebe5d9;
  --paper-bright: #f5f1e8;
  --silver: #929a9b;
  --coke: #35241b;
  --ember: #e65324;
  --ember-deep: #a42d12;
  --ink: #222321;
  --muted: #5e625f;
  --line-dark: rgba(235, 229, 217, .23);
  --line-light: rgba(34, 35, 33, .22);
  --page-pad: clamp(1.25rem, 4vw, 5rem);
  --header-height: 84px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  overflow-x: clip;
}

img { display: block; width: 100%; height: 100%; object-fit: cover; }

section[id] { scroll-margin-top: calc(var(--header-height) + 1rem); }

a { color: inherit; text-decoration: none; }

button, input, select, textarea { font: inherit; }

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

.skip-link {
  position: fixed;
  z-index: 1000;
  top: .75rem;
  left: .75rem;
  padding: .65rem 1rem;
  background: var(--paper-bright);
  color: var(--ink);
  transform: translateY(-160%);
}

.skip-link:focus { transform: none; }

.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  min-height: var(--header-height);
  padding: 0 var(--page-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  background: rgba(21, 17, 14, .96);
  color: var(--paper-bright);
  border-bottom: 1px solid var(--line-dark);
  backdrop-filter: blur(12px);
}

.brand, .footer-brand { display: inline-flex; align-items: center; gap: .8rem; }

.brand-mark { width: 34px; height: 34px; fill: var(--paper); flex: 0 0 auto; }
.brand-mark__heat { fill: var(--ember); }
.brand-copy { display: grid; line-height: 1.1; }
.brand-copy strong { font-family: "Smiley Sans", sans-serif; font-size: 1.15rem; letter-spacing: .04em; }
.brand-copy small { margin-top: .35rem; color: var(--silver); font-size: .58rem; letter-spacing: .16em; }

.site-nav { display: flex; align-items: center; gap: clamp(1rem, 2vw, 2.2rem); font-size: .9rem; }
.site-nav a { position: relative; padding: 1.9rem 0; }
.site-nav a:not(.nav-contact)::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 1.35rem;
  height: 2px;
  background: var(--ember);
  transition: right .25s ease;
}
.site-nav a:hover::after, .site-nav a:focus-visible::after { right: 0; }
.nav-contact { padding: .65rem 1rem !important; border: 1px solid var(--line-dark); }
.menu-button { display: none; }

.hero {
  position: relative;
  min-height: calc(100vh - var(--header-height));
  display: grid;
  grid-template-columns: 42% 58%;
  background: var(--furnace);
  color: var(--paper-bright);
  overflow: hidden;
}

.hero-lining {
  position: absolute;
  z-index: 2;
  inset: 0 auto 0 0;
  width: clamp(40px, 7vw, 118px);
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
}
.hero-lining span { display: block; border-right: 1px solid rgba(255,255,255,.16); }
.hero-lining__outer { background: #282724; }
.hero-lining__middle { background: #c8bda9; }
.hero-lining__inner { background: #4d3629; }

.hero-copy {
  position: relative;
  z-index: 3;
  padding: clamp(5rem, 10vh, 8rem) clamp(2rem, 5vw, 6rem) 3rem max(var(--page-pad), clamp(5.5rem, 9vw, 10rem));
  align-self: center;
}

.eyebrow {
  margin: 0 0 1.5rem;
  color: var(--ember);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .18em;
}

h1, h2, h3 { margin: 0; font-family: "Smiley Sans", "Noto Sans SC", sans-serif; line-height: 1.04; font-weight: 700; }
h1 { font-size: clamp(3.6rem, 6.2vw, 7.6rem); letter-spacing: -.025em; }
h1 span, h1 em { display: block; }
h1 em { margin-top: .25rem; color: var(--paper); font-style: normal; font-size: clamp(1.65rem, 2.5vw, 3.4rem); line-height: 1.12; letter-spacing: .01em; white-space: nowrap; }
h2 { font-size: clamp(3rem, 5vw, 6.2rem); letter-spacing: -.02em; }
h3 { font-size: clamp(2rem, 3.2vw, 4rem); }

.hero-intro { max-width: 34rem; margin: 2rem 0 0; color: #c4c0b8; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2.2rem; }
.button { min-height: 52px; padding: .85rem 1.1rem; display: inline-flex; align-items: center; justify-content: space-between; gap: 2rem; border: 1px solid transparent; border-radius: 0; font-weight: 700; cursor: pointer; }
.button--light { background: var(--paper-bright); color: var(--ink); }
.button--outline { border-color: var(--line-dark); color: var(--paper-bright); }
.button--light:hover, .button--light:focus-visible { background: var(--ember); color: white; }
.button--outline:hover, .button--outline:focus-visible { border-color: var(--ember); color: var(--ember); }
.hero-meta { margin: 3rem 0 0; color: var(--silver); font-size: .82rem; letter-spacing: .06em; }
.hero-meta span { margin-right: .7rem; color: var(--ember); font-family: "Smiley Sans"; font-size: 1.5rem; }

.hero-media { position: relative; margin: 0; min-width: 0; }
.hero-media::before { content: ""; position: absolute; z-index: 1; inset: 0; background: linear-gradient(90deg, var(--furnace) 0%, transparent 25%, transparent 80%, rgba(21,17,14,.3)); }
.hero-media figcaption { position: absolute; z-index: 2; inset: auto 1.2rem 1rem 1.2rem; display: flex; justify-content: space-between; color: rgba(255,255,255,.65); font-size: .65rem; letter-spacing: .2em; }

.process-band {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 0 var(--page-pad);
  background: #1b1511;
  color: var(--paper);
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}
.process-step { position: relative; z-index: 1; min-height: 180px; padding: 2.3rem 2rem 2.7rem; display: grid; align-content: end; border-right: 1px solid var(--line-dark); }
.process-step:first-child { border-left: 1px solid var(--line-dark); }
.process-step span { color: var(--ember); font: 700 1.8rem/1 "Smiley Sans"; }
.process-step strong { margin-top: 1.25rem; font-size: 1.2rem; }
.process-step small { margin-top: .25rem; color: #a9a7a2; }
.process-step--cool span { color: var(--silver); }
.process-band__line { position: absolute; z-index: 0; left: var(--page-pad); right: var(--page-pad); bottom: 1.4rem; height: 2px; background: linear-gradient(90deg, var(--ember), var(--ember-deep) 45%, var(--silver) 63%, #dadede); }

.section-dark { background: var(--furnace); color: var(--paper); }
.material-intro { display: grid; grid-template-columns: minmax(360px, .76fr) 1.24fr; }
.section-heading { padding: clamp(4rem, 8vw, 9rem) var(--page-pad); }
.section-heading h2 { max-width: 11ch; }
.material-intro .section-heading h2 { max-width: none; font-size: clamp(2.1rem, 3vw, 3.75rem); }
.section-heading > p:last-child { max-width: 37rem; margin: 2rem 0 0; }
.section-heading--dark > p:last-child { color: #aaa59e; }
.wide-media { position: relative; margin: 0; min-height: 720px; overflow: hidden; }
.wide-media::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, var(--furnace), transparent 24%); }
.wide-media figcaption { position: absolute; z-index: 1; right: 1.2rem; bottom: 1rem; color: rgba(255,255,255,.72); font-size: .72rem; letter-spacing: .08em; }

.process-story { background: var(--paper); }
.section-heading--paper { display: grid; grid-template-columns: .55fr 1fr; grid-template-rows: auto auto; gap: 0 4rem; border-bottom: 1px solid var(--line-light); }
.section-heading--paper .eyebrow { color: var(--ember-deep); }
.section-heading--paper .eyebrow { grid-column: 1 / -1; }
.section-heading--paper h2 { grid-column: 1; }
.section-heading--paper > p:last-child { grid-column: 2; align-self: end; margin: 0; padding-bottom: .65rem; }
.process-visual { min-height: 620px; display: grid; grid-template-columns: 1fr 1.35fr; border-bottom: 1px solid var(--line-light); }
.process-visual--refining { grid-template-columns: 1.35fr 1fr; }
.process-visual__copy { padding: clamp(3rem, 6vw, 7rem) var(--page-pad); display: flex; flex-direction: column; justify-content: flex-end; }
.process-visual__copy p { max-width: 31rem; color: var(--muted); }
.process-visual img { min-height: 620px; }
.chapter-no { width: max-content; margin-bottom: auto; color: var(--ember-deep); border-bottom: 2px solid currentColor; font: 700 1.5rem/1 "Smiley Sans"; }

.products { background: var(--furnace); color: var(--paper); }
.products-head { padding: clamp(4rem, 8vw, 9rem) var(--page-pad); display: grid; grid-template-columns: 1fr .65fr; gap: 4rem; align-items: end; }
.products-head > p { max-width: 34rem; margin: 0; color: #aaa59e; }
.product-spread { min-height: 650px; display: grid; grid-template-columns: .9fr 1.1fr; border-top: 1px solid var(--line-dark); }
.product-spread--paper { grid-template-columns: 1.1fr .9fr; background: var(--paper); color: var(--ink); border-color: var(--line-light); }
.product-spread__copy { padding: clamp(3rem, 6vw, 7rem) var(--page-pad); display: flex; flex-direction: column; justify-content: center; }
.product-spread__copy > span { margin-bottom: auto; color: var(--ember); font-size: .75rem; letter-spacing: .14em; }
.product-spread__copy p { max-width: 32rem; color: #aaa59e; }
.product-spread--paper .product-spread__copy p { color: var(--muted); }
.product-spread--paper .product-spread__copy > span { color: var(--ember-deep); }
.product-spread__copy a { width: max-content; margin-top: 1.5rem; padding-bottom: .25rem; border-bottom: 1px solid currentColor; }
.product-spread figure { margin: 0; min-height: 650px; overflow: hidden; }

.application { min-height: 720px; display: grid; grid-template-columns: 1.25fr .75fr; background: var(--paper-bright); }
.application-media { margin: 0; min-height: 720px; }
.application-copy { padding: clamp(4rem, 8vw, 9rem) var(--page-pad); align-self: center; }
.application-copy h2, .circularity-copy h2 { font-size: clamp(2rem, 3vw, 4.1rem); }
.application-copy .eyebrow { color: var(--ember-deep); }
.application-copy p:not(.eyebrow) { max-width: 34rem; color: var(--muted); }
.text-link { display: inline-flex; gap: 2rem; margin-top: 1.5rem; padding-bottom: .35rem; border-bottom: 1px solid currentColor; font-weight: 700; }

.circularity { display: grid; grid-template-columns: .78fr 1.22fr; min-height: 760px; background: #242724; color: var(--paper); }
.circularity-copy { padding: clamp(4rem, 8vw, 9rem) var(--page-pad); align-self: center; }
.circularity-copy p:not(.eyebrow) { max-width: 35rem; color: #b7b9b4; }
.circularity-copy dl { margin: 3rem 0 0; border-top: 1px solid var(--line-dark); }
.circularity-copy dl div { padding: 1.1rem 0; display: grid; grid-template-columns: 8rem 1fr; border-bottom: 1px solid var(--line-dark); }
.circularity-copy dt { color: var(--silver); }
.circularity-copy dd { margin: 0; }
.circularity-media { margin: 0; min-height: 760px; }

.development { padding: clamp(4rem, 8vw, 9rem) var(--page-pad); display: grid; grid-template-columns: .72fr 1.28fr; gap: clamp(3rem, 8vw, 10rem); background: var(--paper); }
.development-intro { position: sticky; top: calc(var(--header-height) + 2rem); align-self: start; }
.development-intro h2, .contact-copy h2 { font-size: clamp(2.2rem, 3vw, 4.2rem); }
.development-intro .eyebrow { color: var(--ember-deep); }
.timeline { position: relative; margin: 0; padding: 0; list-style: none; }
.timeline::before { content: ""; position: absolute; top: 0; bottom: 0; left: 8rem; width: 1px; background: var(--line-light); }
.timeline li { min-height: 175px; display: grid; grid-template-columns: 8rem 1fr; }
.timeline time { position: relative; color: var(--ember-deep); font: 700 2.2rem/1 "Smiley Sans"; }
.timeline time::after { content: ""; position: absolute; top: .45rem; right: -5px; width: 9px; height: 9px; background: var(--ember-deep); }
.timeline div { padding: 0 0 3rem 2.7rem; }
.timeline h3 { font-size: 1.6rem; }
.timeline p { max-width: 38rem; color: var(--muted); }

.contact { display: grid; grid-template-columns: .82fr 1.18fr; background: var(--ember-deep); color: white; }
.contact-copy { padding: clamp(4rem, 8vw, 9rem) var(--page-pad); }
.contact-copy .eyebrow { color: var(--paper); }
.contact-copy > p:not(.eyebrow) { max-width: 34rem; color: rgba(255,255,255,.76); }
.contact address { margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid rgba(255,255,255,.25); font-style: normal; }
.contact address span { display: block; margin-bottom: .5rem; color: var(--paper); font-size: .75rem; letter-spacing: .12em; }
.contact-form { padding: clamp(4rem, 8vw, 9rem) var(--page-pad); background: var(--furnace); }
.contact-form label { display: grid; gap: .5rem; margin-bottom: 1.4rem; color: #bcb8b1; font-size: .82rem; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.contact-form input, .contact-form select, .contact-form textarea { width: 100%; color: white; background: transparent; border: 0; border-bottom: 1px solid var(--line-dark); border-radius: 0; padding: .75rem 0; resize: vertical; }
.contact-form select { color-scheme: dark; }
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus { outline: none; border-color: var(--ember); }
.contact-form input:focus-visible, .contact-form select:focus-visible, .contact-form textarea:focus-visible { outline: 2px solid var(--ember); outline-offset: 4px; }
.form-label { display: flex; justify-content: space-between; gap: 1rem; }
.form-label small { color: var(--silver); font-size: .7rem; letter-spacing: .08em; }
.button--submit { width: 100%; background: var(--paper); color: var(--ink); border: 0; }
.button--submit:hover, .button--submit:focus-visible { background: var(--ember); color: white; }
.form-status { min-height: 1.8em; margin: 1rem 0 0; color: #f5bdac; }

.site-footer { padding: 2.2rem var(--page-pad); display: grid; grid-template-columns: 1.4fr .8fr 1fr auto; align-items: center; gap: 2rem; background: #0e0c0a; color: #96938e; border-top: 1px solid var(--line-dark); font-size: .75rem; }
.footer-brand { color: var(--paper); font-weight: 700; }
.footer-brand .brand-mark { width: 28px; height: 28px; }
.site-footer p { margin: 0; }
.creative-note { color: #b8b4ad; }

@media (max-width: 1080px) {
  :root { --header-height: 72px; }
  .brand-copy small { display: none; }
  .site-nav { gap: 1rem; font-size: .82rem; }
  .hero { grid-template-columns: 48% 52%; }
  .hero-copy { padding-left: max(var(--page-pad), 5.5rem); }
  .process-step { padding-inline: 1rem; }
  .material-intro, .circularity { grid-template-columns: .9fr 1.1fr; }
  .site-footer { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px) {
  :root { --page-pad: 1.25rem; --header-height: 68px; }
  .site-header { padding-inline: var(--page-pad); }
  .brand-copy strong { font-size: .92rem; }
  .menu-button { min-width: 52px; min-height: 44px; display: inline-flex; align-items: center; justify-content: flex-end; gap: .7rem; color: var(--paper); background: transparent; border: 0; padding: .65rem 0; cursor: pointer; }
  .menu-button__icon { width: 26px; display: grid; gap: 6px; }
  .menu-button__icon i { width: 100%; height: 1px; background: currentColor; transition: transform .2s ease; }
  .menu-button[aria-expanded="true"] .menu-button__icon i:first-child { transform: translateY(3.5px) rotate(45deg); }
  .menu-button[aria-expanded="true"] .menu-button__icon i:last-child { transform: translateY(-3.5px) rotate(-45deg); }
  .site-nav { position: fixed; inset: var(--header-height) 0 auto; display: grid; gap: 0; padding: 1rem var(--page-pad) 2rem; background: #15110ef7; border-bottom: 1px solid var(--line-dark); transform: translateY(-130%); visibility: hidden; transition: transform .24s ease, visibility .24s; }
  .site-nav.is-open { transform: none; visibility: visible; }
  .site-nav a { padding: 1rem 0; border-bottom: 1px solid var(--line-dark); }
  .site-nav a::after { display: none; }
  .nav-contact { margin-top: 1rem; padding: .85rem 1rem !important; text-align: center; border: 1px solid var(--ember) !important; }
  body.menu-open { overflow: hidden; }

  .hero { min-height: auto; grid-template-columns: 1fr; }
  .hero-lining { width: 58px; bottom: auto; height: 58%; }
  .hero-copy { min-height: 610px; padding: 5rem 1.25rem 3rem 5.2rem; }
  h1 { font-size: clamp(3.4rem, 16vw, 5.3rem); }
  h2 { font-size: clamp(2.8rem, 13vw, 4.4rem); }
  .hero-actions { display: grid; }
  .hero-media { height: 62vh; min-height: 430px; }
  .hero-media::before { background: linear-gradient(180deg, var(--furnace), transparent 30%); }

  .process-band { grid-template-columns: 1fr 1fr; padding-inline: 0; }
  .process-step { min-height: 145px; border-bottom: 1px solid var(--line-dark); }
  .process-step:first-child { border-left: 0; }
  .process-band__line { display: none; }
  .material-intro, .section-heading--paper, .process-visual, .process-visual--refining, .products-head, .product-spread, .product-spread--paper, .application, .circularity, .development, .contact { grid-template-columns: 1fr; }
  .wide-media, .process-visual img, .product-spread figure, .application-media, .circularity-media { min-height: 430px; }
  .section-heading { padding-block: 4.5rem; }
  .section-heading--paper { gap: 2rem; }
  .section-heading--paper .eyebrow, .section-heading--paper h2, .section-heading--paper > p:last-child { grid-column: 1; }
  .section-heading--paper > p:last-child { padding: 0; }
  .process-visual { min-height: auto; }
  .process-visual--refining img { order: 2; }
  .process-visual__copy { min-height: 420px; }
  .products-head { gap: 2rem; }
  .product-spread { min-height: auto; }
  .product-spread figure { min-height: 460px; }
  .product-spread--paper figure { order: 2; }
  .application-media { order: 2; }
  .application-copy { padding-block: 4.5rem; }
  .circularity-copy { padding-block: 4.5rem; }
  .development { gap: 4rem; }
  .development-intro { position: static; }
  .timeline::before { left: 5rem; }
  .timeline li { grid-template-columns: 5rem 1fr; }
  .timeline time { font-size: 1.6rem; }
  .timeline div { padding-left: 1.5rem; }
  .contact-form, .contact-copy { padding-block: 4.5rem; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .site-footer { grid-template-columns: 1fr; gap: 1rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}