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

:root {
  --navy: #031a39;
  --navy-soft: #07274d;
  --paper: #f3f2ef;
  --film: #cad5e5;
  --ink: #172638;
  --muted: #526477;
  --copper: #a96438;
  --copper-dark: #774326;
  --line-light: rgba(243, 242, 239, 0.25);
  --line-dark: rgba(23, 38, 56, 0.22);
  --page: min(1340px, calc(100vw - 72px));
  --display: "Smiley Sans", "Microsoft YaHei", sans-serif;
  --body: "Microsoft YaHei", "PingFang SC", sans-serif;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  overflow-x: hidden;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  text-rendering: optimizeLegibility;
}
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 0.28em; }
button, input, select, textarea { font: inherit; }
img { display: block; width: 100%; height: 100%; object-fit: cover; }
svg { display: block; }
::selection { background: var(--copper); color: #fff; }
*:focus-visible { outline: 3px solid #5f82b3; outline-offset: 4px; }
* { scrollbar-color: var(--copper) var(--paper); scrollbar-width: thin; }
::-webkit-scrollbar { width: 11px; }
::-webkit-scrollbar-track { background: var(--paper); }
::-webkit-scrollbar-thumb { background: var(--copper); border: 3px solid var(--paper); }

.skip-link {
  position: fixed;
  left: 16px;
  top: -80px;
  z-index: 1000;
  background: var(--paper);
  color: var(--navy);
  padding: 14px 18px;
  transition: top 180ms ease-out;
}
.skip-link:focus { top: 16px; }

.site-header {
  position: absolute;
  inset: 0 0 auto;
  z-index: 20;
  min-height: 82px;
  padding: 0 max(36px, calc((100vw - 1340px) / 2));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  color: var(--paper);
  border-bottom: 1px solid var(--line-light);
}
.brand { display: inline-flex; align-items: center; gap: 13px; min-height: 48px; text-decoration: none; }
.brand-mark { width: 42px; height: 42px; fill: none; stroke: currentColor; stroke-width: 1.4; }
.brand-mark path:last-child { stroke: var(--copper); stroke-width: 2; }
.brand span { display: grid; gap: 3px; }
.brand b { font: 500 22px/1 var(--display); letter-spacing: 0.02em; }
.brand small { color: #b9c8db; font-size: 11px; letter-spacing: 0.16em; }
.desktop-nav { display: flex; align-items: center; gap: clamp(20px, 2.4vw, 38px); }
.desktop-nav a { position: relative; min-height: 48px; display: inline-flex; align-items: center; color: #dbe4ee; font-size: 14px; text-decoration: none; }
.desktop-nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: 8px; height: 1px; background: var(--copper); transition: right 220ms ease-out; }
.desktop-nav a:hover::after, .desktop-nav a:focus-visible::after { right: 0; }
.menu-button { display: none; }

.hero {
  min-height: 940px;
  position: relative;
  overflow: hidden;
  background: var(--navy);
  color: var(--paper);
  isolation: isolate;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 82px 0 auto;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.28), transparent);
  z-index: 3;
}
.hero-copy {
  position: relative;
  z-index: 5;
  width: var(--page);
  margin: 0 auto;
  padding-top: 150px;
}
.hero h1 {
  max-width: 820px;
  margin: 0;
  font: 500 clamp(60px, 6vw, 92px)/0.98 var(--display);
  letter-spacing: -0.025em;
}
.hero-copy > p { max-width: 650px; margin: 26px 0 32px; color: #c6d2df; font-size: 18px; line-height: 1.8; }
.primary-action, .secondary-action {
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  gap: 24px;
  padding: 0 21px;
  border: 1px solid #c77c4d;
  background: var(--copper);
  color: #fff;
  box-shadow: 0 10px 26px rgba(1, 9, 22, 0.2);
  font-weight: 700;
  text-decoration: none;
  transition: background 200ms ease-out, transform 200ms ease-out, box-shadow 200ms ease-out;
}
.primary-action:hover, .secondary-action:hover { background: #bd7548; transform: translateY(-2px); box-shadow: 0 14px 30px rgba(1, 9, 22, 0.28); }
.primary-action:active, .secondary-action:active { transform: translateY(0); box-shadow: 0 5px 14px rgba(1, 9, 22, 0.2); }
.primary-action svg, .secondary-action svg, .material-copy a svg { width: 19px; height: 19px; fill: none; stroke: currentColor; stroke-width: 1.6; }
.hero-media {
  position: absolute;
  z-index: 1;
  left: 0;
  right: 0;
  bottom: 0;
  height: 610px;
  margin: 0;
  overflow: hidden;
  border-top: 1px solid var(--line-light);
}
.hero-media::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(3,26,57,.62) 0, rgba(3,26,57,.12) 42%, transparent 70%); }
.hero-media img { object-position: center 56%; }
.hero-register {
  position: absolute;
  z-index: 6;
  left: max(36px, calc((100vw - 1340px) / 2));
  right: max(36px, calc((100vw - 1340px) / 2));
  bottom: 35px;
  display: flex;
  align-items: center;
  gap: 20px;
  color: #dbe4ee;
  font-size: 11px;
  letter-spacing: 0.15em;
}
.hero-register i { flex: 1; height: 1px; background: var(--line-light); }
.hero-ribbon { position: absolute; z-index: 4; left: 0; right: 0; bottom: -8px; width: 100%; height: 190px; pointer-events: none; }
.hero-ribbon path { fill: none; stroke: rgba(238,244,250,.37); stroke-width: 1.2; vector-effect: non-scaling-stroke; }
.hero-ribbon .ribbon-main { stroke: rgba(190,114,68,.85); stroke-width: 1.5; }
.motion-ready .hero-ribbon path { animation: ribbon-draw 1.2s cubic-bezier(.16,1,.3,1) both; }
@keyframes ribbon-draw { from { stroke-dasharray: 1 1; stroke-dashoffset: 1; } to { stroke-dasharray: 1 0; stroke-dashoffset: 0; } }

.company-intro {
  width: var(--page);
  margin: 0 auto;
  padding: 116px 0 106px;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(320px, .65fr);
  gap: 8vw;
  align-items: end;
}
.company-intro > p { margin: 0; max-width: 860px; font: 400 clamp(35px, 4.2vw, 62px)/1.12 var(--display); letter-spacing: -0.025em; }
.company-facts { border-top: 1px solid var(--line-dark); }
.company-facts span { display: block; padding: 18px 0; border-bottom: 1px solid var(--line-dark); color: #405266; font-size: 14px; line-height: 1.65; }

.materials { padding-bottom: 120px; }
.section-heading {
  width: var(--page);
  margin: 0 auto;
  padding: 98px 0 66px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, .55fr);
  gap: 8vw;
  border-top: 1px solid var(--line-dark);
}
.section-heading h2, .process-copy h2, .quality-copy h2, .responsibility-copy h2, .contact-copy h2 {
  margin: 0;
  font: 500 clamp(44px, 5vw, 76px)/1.03 var(--display);
  letter-spacing: -0.025em;
}
.section-heading p, .process-copy p, .quality-copy p, .responsibility-copy > p, .contact-copy > p { margin: 8px 0 0; color: var(--muted); font-size: 17px; line-height: 1.82; }
.material-passage {
  width: var(--page);
  min-height: 530px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(320px, .72fr) minmax(0, 1.28fr);
  border-top: 1px solid var(--line-dark);
}
.material-passage:last-child { border-bottom: 1px solid var(--line-dark); }
.material-passage > picture { min-height: 530px; overflow: hidden; }
.material-copy { display: flex; flex-direction: column; justify-content: flex-end; padding: 54px 7vw 54px 0; }
.material-copy h3 { margin: 0 0 18px; font: 500 clamp(38px, 4vw, 60px)/1.05 var(--display); }
.material-copy p { max-width: 37ch; margin: 0; color: var(--muted); line-height: 1.8; }
.material-copy a { width: fit-content; min-height: 48px; margin-top: 32px; display: inline-flex; align-items: center; gap: 18px; color: var(--copper-dark); font-weight: 700; }
.material-passage.polymer { grid-template-columns: minmax(0, 1.25fr) minmax(320px, .75fr); }
.material-passage.polymer .material-copy { padding: 54px 0 54px 7vw; }
.material-passage picture img { transition: transform 700ms cubic-bezier(.16,1,.3,1); }
.material-passage:hover picture img { transform: scale(1.025); }

.process { padding: 118px 0 132px; background: var(--navy); color: var(--paper); }
.process-copy { width: var(--page); margin: 0 auto; display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(320px, .5fr); gap: 9vw; align-items: end; }
.process-copy p { color: #c2cedc; }
.process-stage { width: var(--page); height: min(64vw, 760px); margin: 76px auto 0; position: relative; overflow: hidden; border-top: 1px solid var(--line-light); border-bottom: 1px solid var(--line-light); }
.process-stage img { object-position: center; }
.process-stage figcaption { position: absolute; left: 0; bottom: 0; width: min(540px, 58%); padding: 27px 32px; display: grid; grid-template-columns: auto 1fr; gap: 8px 24px; background: rgba(3,26,57,.94); border-top: 1px solid var(--line-light); border-right: 1px solid var(--line-light); }
.process-stage figcaption b { grid-row: 1 / span 2; font: 500 34px/1 var(--display); }
.process-stage figcaption span { color: #cbd6e2; line-height: 1.6; }
.process-sequence { width: var(--page); margin: 0 auto; }
.process-sequence ol { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); }
.process-sequence li { min-height: 210px; padding: 32px 28px; border-right: 1px solid var(--line-light); }
.process-sequence li:first-child { border-left: 1px solid var(--line-light); }
.process-sequence span { color: #d59268; font-variant-numeric: tabular-nums; }
.process-sequence b { display: block; margin-top: 42px; font: 500 28px/1.1 var(--display); }
.process-sequence p { margin: 12px 0 0; color: #b9c7d7; font-size: 14px; line-height: 1.7; }
.slitting-stage { margin-top: 0; height: min(72vw, 840px); }

.quality { min-height: 780px; display: grid; grid-template-columns: 1.2fr .8fr; background: #08101d; color: var(--paper); }
.quality figure { min-height: 780px; margin: 0; overflow: hidden; }
.quality-copy { padding: 120px max(36px, calc((100vw - 1340px) / 2)) 100px 7vw; display: flex; flex-direction: column; justify-content: center; }
.quality-copy p { color: #bdc9d7; max-width: 42ch; }
.secondary-action { width: fit-content; margin-top: 36px; background: transparent; }
.secondary-action:hover { background: var(--copper); }

.responsibility {
  width: var(--page);
  margin: 0 auto;
  padding: 130px 0;
  display: grid;
  grid-template-columns: minmax(340px, .72fr) minmax(0, 1.28fr);
  gap: 7vw;
  align-items: center;
}
.responsibility-copy > p { margin-top: 28px; }
.responsibility-note { padding-top: 24px; border-top: 1px solid var(--line-dark); font-size: 13px !important; color: #566b80 !important; }
.responsibility picture { height: min(48vw, 650px); overflow: hidden; }

.contact { background: #dfe5ea; display: grid; grid-template-columns: 1fr 1fr; }
.contact-copy { padding: 112px 7vw 108px max(36px, calc((100vw - 1340px) / 2)); background: var(--paper); }
.contact-copy > p { max-width: 44ch; }
address { margin-top: 68px; font-style: normal; }
address dl { margin: 0; border-top: 1px solid var(--line-dark); }
address dl div { padding: 18px 0; display: grid; grid-template-columns: 180px 1fr; gap: 22px; border-bottom: 1px solid var(--line-dark); }
address dt { color: var(--muted); font-size: 13px; }
address dd { margin: 0; line-height: 1.7; }
form { padding: 112px max(36px, calc((100vw - 1340px) / 2)) 108px 7vw; display: grid; grid-template-columns: 1fr 1fr; gap: 27px; align-content: start; }
label { display: grid; gap: 11px; color: #34485d; font-size: 13px; }
input, select, textarea { width: 100%; min-height: 50px; padding: 13px 14px; border: 1px solid #708195; border-radius: 0; background: #f8fafb; color: var(--ink); caret-color: var(--copper); transition: border-color 180ms ease-out, box-shadow 180ms ease-out, background 180ms ease-out; }
textarea { min-height: 126px; resize: vertical; }
input:hover, select:hover, textarea:hover { border-color: #3e566e; }
input:focus, select:focus, textarea:focus { border-color: var(--copper-dark); box-shadow: 0 0 0 3px rgba(169,100,56,.18); background: #fff; outline: none; }
input:disabled, select:disabled, textarea:disabled { background: #cdd5dc; color: #3f5266; cursor: not-allowed; }
.full { grid-column: 1 / -1; }
.form-submit { display: grid; grid-template-columns: 190px 1fr; gap: 24px; align-items: center; }
.form-submit button { min-height: 54px; border: 1px solid var(--navy); border-radius: 0; background: var(--navy); color: #fff; font-weight: 700; cursor: pointer; box-shadow: 0 9px 24px rgba(3,26,57,.16); transition: background 180ms ease-out, transform 180ms ease-out, box-shadow 180ms ease-out; }
.form-submit button:hover { background: var(--navy-soft); transform: translateY(-2px); box-shadow: 0 13px 28px rgba(3,26,57,.22); }
.form-submit button:active { transform: translateY(0); box-shadow: 0 5px 14px rgba(3,26,57,.15); }
.form-submit button:disabled { background: #6c7884; border-color: #6c7884; color: #e9edf1; cursor: not-allowed; transform: none; box-shadow: none; }
.form-status { margin: 0; color: #3c5064; font-size: 13px; line-height: 1.6; }
.form-status.error { color: #8e2f24; font-weight: 700; }

footer { min-height: 160px; padding: 38px max(36px, calc((100vw - 1340px) / 2)); display: grid; grid-template-columns: 1fr auto auto; align-items: center; gap: 44px; background: var(--navy); color: var(--paper); border-top: 1px solid var(--line-light); }
.footer-brand { min-height: 48px; display: inline-flex; align-items: center; width: fit-content; font: 500 23px/1 var(--display); text-decoration: none; }
footer nav { display: flex; gap: 26px; }
footer nav a { min-height: 48px; display: inline-flex; align-items: center; color: #c4d0de; font-size: 13px; }
footer > p { color: #aebdcd; font-size: 12px; }

.mobile-nav { width: 100vw; max-width: none; height: 100dvh; max-height: none; margin: 0; padding: 0; border: 0; background: var(--navy); color: var(--paper); }
.mobile-nav::backdrop { background: var(--navy); }
.mobile-nav-head { height: 82px; padding: 0 24px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line-light); }
.mobile-nav-head > span { font: 500 24px/1 var(--display); }
.menu-close { min-width: 64px; min-height: 48px; border: 1px solid #7e91a8; background: transparent; color: #fff; cursor: pointer; }
.mobile-nav nav { display: grid; padding: 34px 24px; }
.mobile-nav nav a { min-height: 68px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line-light); font: 500 34px/1 var(--display); text-decoration: none; }
.mobile-nav nav a::after { content: ""; width: 9px; height: 9px; border-right: 1px solid var(--copper); border-bottom: 1px solid var(--copper); transform: rotate(-45deg); }

@media (max-width: 980px) {
  :root { --page: calc(100vw - 48px); }
  .site-header { padding-inline: 24px; }
  .desktop-nav { display: none; }
  .menu-button { min-width: 76px; min-height: 48px; padding: 0 14px; display: inline-flex; align-items: center; justify-content: space-between; gap: 12px; border: 1px solid #7c8fa7; background: transparent; color: #fff; cursor: pointer; }
  .menu-button i, .menu-button i::before { content: ""; width: 18px; height: 1px; display: block; background: currentColor; }
  .menu-button i::before { transform: translateY(5px); }
  .hero { min-height: 900px; }
  .hero-copy { padding-top: 145px; }
  .hero h1 { max-width: 700px; font-size: clamp(56px, 9vw, 78px); }
  .hero-copy > p { max-width: 520px; }
  .hero-media { height: 560px; }
  .company-intro, .section-heading, .process-copy { grid-template-columns: 1fr; gap: 42px; }
  .company-facts { max-width: 680px; }
  .material-passage, .material-passage.polymer { min-height: 0; grid-template-columns: 1fr; }
  .material-passage > picture { min-height: 460px; }
  .material-passage.polymer picture { order: 2; }
  .material-passage.polymer .material-copy { order: 1; padding-left: 0; }
  .material-copy { padding: 56px 0; }
  .process-sequence ol { grid-template-columns: 1fr 1fr; }
  .process-sequence li:nth-child(3) { border-left: 1px solid var(--line-light); border-top: 1px solid var(--line-light); }
  .process-sequence li:nth-child(4) { border-top: 1px solid var(--line-light); }
  .quality { grid-template-columns: 1fr; }
  .quality figure { min-height: 560px; }
  .quality-copy { padding: 86px 24px 100px; }
  .responsibility { grid-template-columns: 1fr; gap: 50px; }
  .responsibility picture { height: 600px; }
  .contact { grid-template-columns: 1fr; }
  .contact-copy, form { padding: 86px 24px; }
  footer { grid-template-columns: 1fr; gap: 16px; padding-block: 42px; }
}

@media (max-width: 600px) {
  :root { --page: calc(100vw - 36px); }
  html { scroll-padding-top: 0; }
  .site-header { min-height: 72px; padding-inline: 18px; }
  .brand-mark { width: 36px; height: 36px; }
  .brand b { font-size: 19px; }
  .brand small { font-size: 9px; }
  .menu-button { min-width: 72px; padding-inline: 12px; }
  .hero { min-height: 840px; }
  .hero-copy { padding-top: 124px; }
  .hero h1 { font-size: clamp(48px, 14.5vw, 64px); line-height: 1.03; }
  .hero-copy > p { margin-top: 22px; font-size: 15px; line-height: 1.75; }
  .primary-action { min-height: 52px; }
  .hero-media { height: 430px; }
  .hero-media img { object-position: 54% 56%; }
  .hero-media::after { background: linear-gradient(180deg, rgba(3,26,57,.62), transparent 42%); }
  .hero-register { left: 18px; right: 18px; bottom: 22px; gap: 12px; }
  .hero-register span:last-child { display: none; }
  .hero-ribbon { height: 125px; }
  .company-intro { padding: 78px 0 70px; gap: 36px; }
  .company-intro > p { font-size: 38px; }
  .section-heading { padding: 72px 0 48px; gap: 25px; }
  .section-heading h2, .process-copy h2, .quality-copy h2, .responsibility-copy h2, .contact-copy h2 { font-size: 44px; line-height: 1.08; }
  .section-heading p, .process-copy p, .quality-copy p, .responsibility-copy > p, .contact-copy > p { font-size: 15px; }
  .materials { padding-bottom: 82px; }
  .material-passage > picture { min-height: 320px; }
  .material-copy { padding: 42px 0; }
  .material-copy h3 { font-size: 36px; }
  .process { padding: 78px 0 88px; }
  .process-copy { gap: 24px; }
  .process-stage, .slitting-stage { width: 100%; height: 520px; margin-top: 50px; }
  .process-stage img { object-position: 55% center; }
  .process-stage figcaption { width: calc(100% - 18px); padding: 20px 18px; grid-template-columns: 1fr; }
  .process-stage figcaption b { grid-row: auto; font-size: 30px; }
  .process-sequence ol { grid-template-columns: 1fr; }
  .process-sequence li, .process-sequence li:nth-child(3) { min-height: 0; padding: 26px 18px; border-left: 1px solid var(--line-light); border-top: 1px solid var(--line-light); }
  .process-sequence b { margin-top: 22px; }
  .slitting-stage { margin-top: 0; }
  .quality figure { min-height: 430px; }
  .quality figure img { object-position: 50% center; }
  .quality-copy { padding: 70px 18px 82px; }
  .responsibility { padding: 80px 0; }
  .responsibility picture { height: 380px; }
  .contact-copy, form { padding: 70px 18px; }
  address { margin-top: 48px; }
  address dl div { grid-template-columns: 1fr; gap: 8px; }
  form { grid-template-columns: 1fr; gap: 22px; }
  .full { grid-column: auto; }
  .form-submit { grid-template-columns: 1fr; }
  footer { padding-inline: 18px; }
  footer nav { flex-wrap: wrap; gap: 12px 24px; }
  .mobile-nav-head { height: 72px; padding-inline: 18px; }
  .mobile-nav nav { padding-inline: 18px; }
}

@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; }
}