@font-face {
  font-family: "Yaxin Sans";
  src: url("assets/fonts/noto-sans-sc-subset.ttf") format("truetype");
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
}

:root {
  color-scheme: light;
  --ink: #0b0b0b;
  --ink-2: #151515;
  --paper: #f2eee6;
  --white: #fffdf8;
  --steel: #a7a6a2;
  --muted: #68645d;
  --orange: #ff5a1f;
  --orange-dark: #b92e00;
  --line: rgba(11, 11, 11, .2);
  --line-light: rgba(255, 253, 248, .25);
  --font: "Yaxin Sans", "Microsoft YaHei UI", sans-serif;
  --max: 1600px;
  --pad: clamp(22px, 4vw, 72px);
  --header-h: 74px;
  --ease: cubic-bezier(.16, 1, .3, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--font); font-size: 16px; line-height: 1.65; overflow-x: clip; scrollbar-color: var(--orange) var(--ink); scrollbar-width: thin; }
body::-webkit-scrollbar { width: 10px; }
body::-webkit-scrollbar-track { background: var(--ink); }
body::-webkit-scrollbar-thumb { background: var(--orange); border: 2px solid var(--ink); }
body.menu-open { overflow: hidden; }
img { display: block; width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }
button { color: inherit; }
svg { display: block; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: square; stroke-linejoin: miter; }
::selection { background: var(--orange); color: var(--ink); }

.skip-link { position: fixed; z-index: 100; top: 8px; left: 8px; padding: 10px 14px; background: var(--white); color: var(--ink); transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }
:focus-visible { outline: 3px solid var(--orange); outline-offset: 4px; }

.site-header { position: sticky; z-index: 50; top: 0; min-height: var(--header-h); display: grid; grid-template-columns: minmax(300px, 1fr) auto; align-items: center; gap: 32px; padding: 0 var(--pad); background: var(--white); border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 12px; width: fit-content; min-height: 48px; font-weight: 800; letter-spacing: -.02em; }
.brand__mark { width: 36px; height: 36px; color: var(--orange-dark); stroke-width: 2; }
.brand__mark circle { fill: var(--ink); stroke: none; }
.desktop-nav { display: flex; align-items: stretch; height: var(--header-h); }
.desktop-nav a { position: relative; display: grid; place-items: center; padding: 0 16px; color: #3f3d38; font-size: .9rem; font-weight: 650; }
.desktop-nav a::after { position: absolute; right: 16px; bottom: 16px; left: 16px; height: 2px; background: var(--orange-dark); content: ""; transform: scaleX(0); transform-origin: left; transition: transform .3s var(--ease); }
.desktop-nav a:hover::after, .desktop-nav a:focus-visible::after { transform: scaleX(1); }
.menu-button { display: none; width: 48px; height: 48px; padding: 12px; border: 0; background: transparent; cursor: pointer; }
.menu-button span { display: block; width: 24px; height: 2px; margin: 6px 0; background: currentColor; }

.mobile-menu { position: fixed; z-index: 90; inset: 0; padding: 20px var(--pad) 40px; background: var(--ink); color: var(--white); }
.mobile-menu__top { display: flex; align-items: center; justify-content: space-between; min-height: 54px; color: #bdb8ae; font-size: .85rem; letter-spacing: .12em; }
.menu-close { display: grid; place-items: center; width: 48px; height: 48px; border: 1px solid var(--line-light); background: transparent; cursor: pointer; }
.menu-close svg { width: 24px; height: 24px; }
.mobile-menu nav { display: grid; margin-top: 7vh; border-top: 1px solid var(--line-light); }
.mobile-menu nav a { display: flex; align-items: baseline; gap: 24px; padding: 22px 0; border-bottom: 1px solid var(--line-light); font-size: clamp(1.5rem, 7vw, 2.5rem); font-weight: 800; line-height: 1.1; }
.mobile-menu nav span { color: var(--orange); font-size: .72rem; font-weight: 650; }

.hero { position: relative; min-height: 620px; height: clamp(620px, 72svh, 760px); display: grid; align-items: center; overflow: hidden; background: var(--ink); color: var(--white); }
.hero::before { position: absolute; z-index: 2; inset: 0 auto 0 0; width: 68%; background: rgba(11, 11, 11, .82); content: ""; }
.hero__image { position: absolute; inset: 0; height: 100%; object-fit: cover; object-position: center; }
.hero__content { position: relative; z-index: 3; width: min(1040px, 76vw); padding: clamp(80px, 10vh, 140px) var(--pad); }
.hero h1 { max-width: 1000px; margin: 0; font-size: clamp(3.5rem, 7.1vw, 6rem); font-weight: 900; letter-spacing: -.04em; line-height: .94; }
.hero h1 em { color: var(--orange); font-style: normal; }
.hero__intro { max-width: 630px; margin: 38px 0 0; color: #d4cec3; font-size: clamp(1rem, 1.4vw, 1.22rem); }
.hero__actions { display: flex; flex-wrap: wrap; gap: 28px; margin-top: 42px; }
.text-action { display: inline-flex; align-items: center; justify-content: space-between; gap: 30px; min-width: 180px; padding: 11px 0; border-bottom: 1px solid currentColor; font-size: .93rem; font-weight: 700; }
.text-action svg, .source-link svg, .site-footer > a svg, .contact-form button svg { width: 22px; height: 22px; transition: transform .3s var(--ease); }
.text-action:hover svg, .source-link:hover svg, .site-footer > a:hover svg, .contact-form button:hover svg { transform: translateX(5px); }
.text-action--light { color: var(--white); }
.hero__measure { position: absolute; z-index: 3; top: 18%; right: var(--pad); display: grid; gap: 8px; }
.hero__measure span { display: block; width: 30px; height: 1px; background: rgba(255,255,255,.55); }
.hero__measure span:nth-child(2) { width: 18px; }
.heat-trace { position: absolute; z-index: 3; right: 0; bottom: 18%; left: 0; height: 2px; background: var(--orange); pointer-events: none; }
.heat-trace span { position: absolute; left: 68%; top: 0; width: 2px; height: 18vh; background: var(--orange); }
.heat-trace::after { position: absolute; top: -5px; left: 0; width: 12px; height: 12px; border-radius: 50%; background: var(--orange); box-shadow: 0 0 18px rgba(255, 90, 31, .82); content: ""; animation: heat-pulse 6s linear infinite; }
@keyframes heat-pulse { from { transform: translateX(0); } to { transform: translateX(100vw); } }

.process-rail { position: relative; max-width: var(--max); margin: 0 auto; padding: 58px var(--pad) 72px; background: var(--white); }
.process-rail::before { position: absolute; top: 0; left: 68%; width: 2px; height: 58px; background: var(--orange); content: ""; }
.section-index { display: flex; align-items: baseline; gap: 28px; padding-bottom: 30px; border-bottom: 1px solid var(--line); }
.section-index h2 { margin: 0; font-size: 1rem; font-weight: 700; }
.process-rail__list { position: relative; display: grid; grid-template-columns: repeat(4, 1fr); margin: 0; padding: 34px 0 0; list-style: none; }
.process-rail__list::before { position: absolute; top: 49px; right: 0; left: 0; height: 1px; background: var(--ink); content: ""; }
.process-rail__list li { position: relative; display: grid; gap: 8px; padding-right: 24px; }
.process-rail__list li > span { z-index: 1; display: grid; place-items: center; width: 30px; height: 30px; border: 1px solid var(--ink); border-radius: 50%; background: var(--white); color: var(--ink); font-size: .62rem; font-weight: 800; }
.process-rail__list li:first-child > span { border-color: var(--orange-dark); background: var(--orange); }
.process-rail__list strong { margin-top: 15px; font-size: clamp(1.25rem, 2.2vw, 2rem); letter-spacing: -.04em; }
.process-rail__list small { color: var(--muted); font-size: .84rem; }

.section-shell { max-width: var(--max); margin: 0 auto; padding: clamp(92px, 11vw, 160px) var(--pad); }
.positioning { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(320px, .65fr); gap: clamp(48px, 9vw, 150px); }
.positioning h2, .products h2, .energy h2, .progress h2, .contact h2 { margin: 0; font-size: clamp(2.5rem, 5vw, 5rem); font-weight: 900; letter-spacing: -.04em; line-height: 1.02; }
.positioning__body { padding-top: 42px; border-top: 2px solid var(--ink); }
.positioning__body p { margin: 0 0 24px; color: #3f3c36; font-size: 1.02rem; }
.positioning__body strong { color: var(--ink); font-weight: 800; }
.source-link { display: inline-flex; align-items: center; gap: 18px; margin-top: 14px; color: var(--orange-dark); font-size: .88rem; font-weight: 750; }
.source-link svg { width: 18px; height: 18px; }

.material-route { background: var(--ink); color: var(--white); }
.route-panel { min-height: 600px; display: grid; grid-template-columns: 1.35fr .65fr; border-bottom: 1px solid var(--line-light); }
.route-panel > img { height: 100%; min-height: 600px; object-fit: cover; }
.route-panel__copy { display: flex; flex-direction: column; justify-content: flex-end; padding: clamp(42px, 6vw, 100px) var(--pad); }
.route-panel__copy h3 { margin: 0 0 22px; font-size: clamp(2rem, 3.5vw, 3.5rem); letter-spacing: -.04em; line-height: 1.05; }
.route-panel__copy p { max-width: 480px; margin: 0; color: #c7c2b9; }
.route-panel--reverse { grid-template-columns: .65fr 1.35fr; }
.route-panel--reverse > img { grid-column: 2; }
.route-panel--reverse .route-panel__copy { grid-row: 1; grid-column: 1; }

.products { padding-bottom: 0; }
.products__heading { display: block; }
.products__heading h2 { max-width: 920px; margin-top: 0; }
.specimen-spread, .coproduct-spread { display: grid; grid-template-columns: 1.35fr .65fr; margin: 100px calc(var(--pad) * -1) 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.specimen-spread > img, .coproduct-spread > img { height: 540px; object-fit: cover; }
.specimen-spread__copy, .coproduct-spread__copy { display: flex; flex-direction: column; justify-content: flex-end; padding: 55px var(--pad); }
.specimen-spread h3, .coproduct-spread h3 { margin: 0 0 22px; font-size: clamp(2.3rem, 4vw, 4rem); letter-spacing: -.04em; line-height: 1; }
.specimen-spread p, .coproduct-spread p { max-width: 500px; margin: 0; color: #4a4741; }
.coproduct-spread { grid-template-columns: .65fr 1.35fr; margin-top: 0; }

.energy { background: var(--ink); color: var(--white); }
.energy__intro { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(300px, .6fr); gap: clamp(50px, 9vw, 150px); }
.energy__intro > p { align-self: end; margin: 0 0 8px; padding-top: 28px; border-top: 1px solid var(--line-light); color: #c7c2b9; }
.energy__spread { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--line-light); }
.energy__spread article + article { border-left: 1px solid var(--line-light); }
.energy__spread img { aspect-ratio: 16 / 9; object-fit: cover; }
.energy__spread article > div { min-height: 300px; padding: 44px var(--pad) 64px; }
.energy__spread h3 { margin: 0 0 18px; font-size: clamp(2rem, 3.2vw, 3.25rem); letter-spacing: -.04em; line-height: 1; }
.energy__spread p { max-width: 560px; margin: 0; color: #c7c2b9; }

.progress { display: grid; grid-template-columns: minmax(280px, .65fr) minmax(0, 1.2fr); gap: 0 clamp(40px, 7vw, 110px); }
.progress__heading { align-self: start; position: sticky; top: calc(var(--header-h) + 36px); }
.progress__heading p:last-child { max-width: 560px; margin: 34px 0 0; color: var(--muted); }
.progress__visual { grid-column: 2; margin-bottom: 55px; }
.progress__visual img { aspect-ratio: 16 / 9; object-fit: cover; }
.timeline { grid-column: 2; margin: 0; padding: 0; list-style: none; border-top: 2px solid var(--ink); }
.timeline li { display: grid; grid-template-columns: 115px 1fr; gap: 20px; padding: 34px 0; border-bottom: 1px solid var(--line); }
.timeline time { color: var(--orange-dark); font-size: .82rem; font-weight: 800; letter-spacing: .08em; }
.timeline h3 { margin: 0 0 10px; font-size: 1.2rem; line-height: 1.35; }
.timeline p { margin: 0; color: var(--muted); }
.timeline a { display: inline-block; margin-top: 12px; border-bottom: 1px solid currentColor; color: var(--orange-dark); font-size: .8rem; font-weight: 750; }

.contact { display: grid; grid-template-columns: 1fr 1fr; background: var(--orange); color: var(--ink); }
.contact__info { padding: clamp(80px, 9vw, 140px) var(--pad); }
.contact__boundary { max-width: 630px; margin: 38px 0 0; color: #32150b; }
.contact dl { margin: 55px 0 0; border-top: 2px solid var(--ink); }
.contact dl > div { display: grid; grid-template-columns: 160px 1fr; gap: 20px; padding: 22px 0; border-bottom: 1px solid rgba(11,11,11,.38); }
.contact dt { font-size: .78rem; font-weight: 750; }
.contact dd { margin: 0; font-weight: 750; overflow-wrap: anywhere; }
.contact dd a { border-bottom: 1px solid currentColor; }
.contact-form { display: grid; align-content: center; gap: 24px; padding: clamp(70px, 9vw, 140px) var(--pad); background: var(--ink); color: var(--white); }
.contact-form__head { display: flex; justify-content: space-between; align-items: center; padding-bottom: 20px; border-bottom: 1px solid var(--line-light); }
.contact-form__head span { font-size: 1.25rem; font-weight: 800; }
.contact-form__head small { color: #aaa69e; }
.contact-form label { display: grid; gap: 8px; color: #c7c2b9; font-size: .78rem; font-weight: 650; }
.contact-form input, .contact-form textarea { width: 100%; min-height: 48px; padding: 10px 0; border: 0; border-bottom: 1px solid #76716a; border-radius: 0; outline: 0; background: transparent; color: var(--white); caret-color: var(--orange); resize: vertical; }
.contact-form input:focus, .contact-form textarea:focus { border-bottom-color: var(--orange); box-shadow: 0 2px 0 var(--orange); }
.contact-form button { display: flex; justify-content: space-between; align-items: center; width: 100%; min-height: 54px; margin-top: 8px; padding: 0 18px; border: 1px solid var(--orange); background: var(--orange); color: var(--ink); font-weight: 800; cursor: pointer; }
.form-status { min-height: 1.6em; margin: 0; color: #f9d7ca; font-size: .85rem; }

.site-footer { display: grid; grid-template-columns: 1fr 1fr auto; align-items: end; gap: 40px; padding: 55px var(--pad); background: var(--ink); color: var(--white); border-top: 1px solid var(--line-light); }
.site-footer__brand { display: grid; gap: 6px; }
.site-footer__brand strong { font-size: 1.15rem; }
.site-footer__brand span, .site-footer__meta { color: #a9a49b; font-size: .78rem; }
.site-footer__meta p { margin: 4px 0; }
.site-footer > a { display: inline-flex; align-items: center; gap: 14px; font-size: .85rem; font-weight: 700; }
.site-footer > a svg { transform: none; }
.site-footer > a:hover svg { transform: translateY(-4px); }

@media (max-width: 1080px) {
  .desktop-nav { display: none; }
  .site-header { grid-template-columns: 1fr auto; }
  .menu-button { display: block; }
  .hero__content { width: 84vw; }
  .products__heading { grid-template-columns: 1fr; }
  .specimen-spread, .coproduct-spread { grid-template-columns: 1fr 1fr; }
  .progress { grid-template-columns: 1fr; }
  .progress__heading { position: static; }
  .progress__visual, .timeline { grid-column: 1; }
  .progress__visual { margin-top: 60px; }
}

@media (max-width: 760px) {
  :root { --header-h: 68px; }
  .brand__name { max-width: 220px; font-size: .88rem; line-height: 1.25; }
  .brand__mark { width: 32px; height: 32px; flex: 0 0 auto; }
  .site-header { padding-right: 10px; }
  .hero { min-height: 760px; max-height: none; align-items: end; }
  .hero::before { width: 100%; background: rgba(11, 11, 11, .64); }
  .hero__image { object-position: 64% center; }
  .hero__content { width: 100%; padding: 250px var(--pad) 96px; }
  .hero h1 { font-size: clamp(3rem, 14vw, 4.3rem); line-height: .98; }
  .hero__intro { font-size: .98rem; }
  .hero__actions { display: grid; gap: 12px; }
  .heat-trace { bottom: 52%; }
  .heat-trace span { left: 78%; height: 24vh; }
  .process-rail::before { left: 78%; }
  .hero__measure { top: 14%; }
  .process-rail { padding-top: 45px; }
  .section-index { align-items: flex-start; }
  .process-rail__list { grid-template-columns: 1fr; padding-top: 24px; }
  .process-rail__list::before { top: 24px; bottom: 0; left: 14px; width: 1px; height: auto; }
  .process-rail__list li { grid-template-columns: 30px 1fr; gap: 4px 16px; padding: 0 0 28px; }
  .process-rail__list strong { grid-row: 1; grid-column: 2; align-self: center; margin: 0; font-size: 1.25rem; }
  .process-rail__list small { grid-column: 2; }
  .positioning, .energy__intro { grid-template-columns: 1fr; }
  .positioning__body { padding-top: 28px; }
  .route-panel, .route-panel--reverse { min-height: 0; grid-template-columns: 1fr; }
  .route-panel > img, .route-panel--reverse > img { grid-row: 1; grid-column: 1; height: 360px; min-height: 0; }
  .route-panel .route-panel__copy, .route-panel--reverse .route-panel__copy { grid-row: 2; grid-column: 1; min-height: 330px; }
  .products { padding-top: 96px; }
  .specimen-spread, .coproduct-spread { grid-template-columns: 1fr; margin-top: 60px; }
  .specimen-spread > img, .coproduct-spread > img { height: 340px; }
  .specimen-spread__copy, .coproduct-spread__copy { min-height: 330px; }
  .coproduct-spread > img { grid-row: 1; }
  .coproduct-spread__copy { grid-row: 2; }
  .energy__intro { padding-top: 96px; padding-bottom: 70px; }
  .energy__spread { grid-template-columns: 1fr; }
  .energy__spread article + article { border-top: 1px solid var(--line-light); border-left: 0; }
  .energy__spread article > div { min-height: 270px; }
  .progress { padding-top: 96px; }
  .progress__visual { margin: 50px calc(var(--pad) * -1) 40px; }
  .timeline li { grid-template-columns: 80px 1fr; }
  .contact { grid-template-columns: 1fr; }
  .contact dl > div { grid-template-columns: 1fr; gap: 5px; }
  .contact-form { min-height: 760px; }
  .site-footer { grid-template-columns: 1fr; align-items: start; }
}

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