:root {
  --forest: #153f35;
  --forest-deep: #0b2b24;
  --forest-soft: #2e6656;
  --cream: #f4f0e5;
  --paper: #fbf9f2;
  --white: #fffef9;
  --ink: #18231f;
  --muted: #66716b;
  --line: #d9d6c9;
  --brass: #ae7b38;
  --shadow: 0 24px 70px -48px rgba(11, 43, 36, .55);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  color: var(--ink);
  background: var(--paper);
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { display: block; width: 100%; }
button { font: inherit; }
.shell { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  color: var(--forest-deep);
  background: rgba(251, 249, 242, .95);
  border-bottom: 1px solid rgba(21, 63, 53, .12);
  backdrop-filter: blur(14px);
}
.header-inner { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.expo-brand { display: flex; align-items: center; gap: 12px; font-weight: 800; }
.expo-mark {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  color: var(--cream);
  background: var(--forest);
  font-family: Georgia, serif;
  font-size: .82rem;
  letter-spacing: .08em;
}
.expo-name { font-size: 1.08rem; line-height: 1.4; letter-spacing: .015em; }
.site-nav { display: flex; align-items: center; gap: 26px; color: #52615a; font-size: .88rem; font-weight: 700; }
.site-nav a:hover { color: var(--forest); }
.nav-back { padding: 8px 16px; color: var(--cream) !important; background: var(--forest); }
.menu-toggle { display: none; border: 1px solid var(--forest); color: var(--forest); background: transparent; padding: 7px 12px; cursor: pointer; }

.hero { min-height: 610px; display: grid; grid-template-columns: minmax(0, 52%) minmax(0, 48%); background: var(--forest); }
.hero-copy { display: grid; align-items: center; padding: 76px max(48px, calc((100vw - 1180px) / 2)); padding-right: 64px; }
.hero-copy-inner { max-width: 650px; }
.overline { margin-bottom: 18px; color: #d7b47b; font: 700 .74rem/1.4 Georgia, serif; letter-spacing: .2em; }
.overline.green { color: var(--forest-soft); }
.overline.brass { color: var(--brass); }
h1, h2, h3 { font-family: "Noto Serif SC", "Songti SC", STSong, serif; }
h1 { color: var(--cream); font-size: clamp(2.6rem, 4.5vw, 4.8rem); line-height: 1.14; letter-spacing: .02em; }
.hero-lead { max-width: 590px; margin-top: 30px; color: rgba(244, 240, 229, .76); font-size: 1.08rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }
.button { min-height: 46px; display: inline-flex; align-items: center; justify-content: center; padding: 10px 22px; font-weight: 800; transition: transform .2s, background .2s; }
.button:hover { transform: translateY(-2px); }
.button-light { color: var(--forest-deep); background: var(--cream); }
.button-outline { color: var(--cream); border: 1px solid rgba(244, 240, 229, .45); }
.hero-image {
  position: relative;
  min-width: 0;
  background: linear-gradient(90deg, rgba(21, 63, 53, .18), transparent 35%), url("lianyuan_hero.jpg") center/cover no-repeat;
}
.logo-card { position: absolute; right: 7%; bottom: 7%; width: min(330px, 70%); padding: 20px 24px 16px; background: rgba(255, 254, 249, .94); box-shadow: var(--shadow); }
.logo-card img { height: 72px; object-fit: contain; }
.logo-card span { display: block; margin-top: 8px; padding-top: 10px; border-top: 1px solid var(--line); color: var(--muted); font-size: .78rem; letter-spacing: .12em; text-align: center; }

.facts { color: var(--cream); background: var(--forest-deep); }
.facts-grid { display: grid; grid-template-columns: repeat(5, 1fr); }
.fact { min-height: 116px; display: flex; flex-direction: column; justify-content: center; padding: 22px 28px; border-left: 1px solid rgba(244, 240, 229, .12); }
.fact:last-child { border-right: 1px solid rgba(244, 240, 229, .12); }
.fact strong { font-family: Georgia, serif; font-size: 1.8rem; line-height: 1.2; color: #d7b47b; }
.fact span { margin-top: 6px; color: rgba(244, 240, 229, .64); font-size: .82rem; }

.section { padding: 104px 0; }
.intro { background: var(--paper); }
.intro-grid { display: grid; grid-template-columns: minmax(0, 36fr) minmax(0, 64fr); gap: 70px; }
.section-title { padding-right: 36px; border-right: 1px solid var(--line); }
.section-title h2, .section-heading h2, .capacity-copy h2, .contact-title h2 { color: var(--forest-deep); font-size: clamp(2rem, 3.2vw, 3.2rem); line-height: 1.25; }
.intro-copy .lead { color: var(--forest); font-family: "Noto Serif SC", "Songti SC", STSong, serif; font-size: 1.35rem; line-height: 1.85; }
.copy-columns { display: grid; grid-template-columns: repeat(2, 1fr); gap: 34px; margin-top: 30px; color: var(--muted); }

.solutions { color: var(--cream); background: var(--forest); }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 56px; margin-bottom: 44px; }
.section-heading h2 { color: inherit; }
.section-heading > p { max-width: 470px; color: inherit; opacity: .66; }
.solution-layout { display: grid; grid-template-columns: 56% 44%; min-height: 520px; border: 1px solid rgba(244, 240, 229, .18); }
.solution-feature { position: relative; min-height: 520px; overflow: hidden; }
.solution-feature img { position: absolute; inset: 0; height: 100%; object-fit: cover; }
.solution-feature::after { content: ""; position: absolute; inset: 36% 0 0; background: linear-gradient(transparent, rgba(7, 31, 26, .9)); }
.solution-feature figcaption { position: absolute; z-index: 1; left: 42px; right: 42px; bottom: 38px; }
.solution-feature figcaption span, .solution-list > article > span { color: #d7b47b; font: 700 .78rem/1.4 Georgia, serif; letter-spacing: .12em; }
.solution-feature h3 { margin: 6px 0 8px; font-size: 2rem; }
.solution-feature p { max-width: 560px; color: rgba(244, 240, 229, .72); }
.solution-list { display: grid; grid-template-rows: repeat(3, 1fr); }
.solution-list article { display: grid; grid-template-columns: 52px 1fr; gap: 18px; align-items: start; padding: 34px 38px; border-bottom: 1px solid rgba(244, 240, 229, .16); }
.solution-list article:last-child { border-bottom: none; }
.solution-list h3 { margin-bottom: 7px; font-size: 1.25rem; }
.solution-list p { color: rgba(244, 240, 229, .65); font-size: .9rem; }

.scenes { background: var(--cream); }
.section-heading.compact { color: var(--ink); }
.section-heading.compact > p { color: var(--muted); opacity: 1; }
.scene-grid { display: grid; grid-template-columns: 1.35fr .85fr; grid-template-rows: repeat(2, 250px); gap: 18px; }
.scene-grid figure { position: relative; min-width: 0; overflow: hidden; background: #d6d5cd; }
.scene-grid .scene-main { grid-row: 1 / 3; }
.scene-grid img { height: 100%; object-fit: cover; transition: transform .45s ease; }
.scene-grid figure:hover img { transform: scale(1.025); }
.scene-grid figcaption { position: absolute; left: 18px; bottom: 18px; padding: 8px 13px; color: var(--cream); background: rgba(11, 43, 36, .86); font-size: .86rem; }

.capacity { background: var(--paper); }
.capacity-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(360px, 45%); gap: 88px; align-items: center; }
.capacity-lead { max-width: 560px; margin: 26px 0 34px; color: var(--muted); font-size: 1.06rem; }
.capacity-list { list-style: none; border-top: 1px solid var(--line); }
.capacity-list li { display: grid; grid-template-columns: 160px 1fr; gap: 24px; padding: 21px 0; border-bottom: 1px solid var(--line); }
.capacity-list strong { color: var(--forest); }
.capacity-list span { color: var(--muted); }
.catalog-page { padding: 16px; background: var(--cream); box-shadow: var(--shadow); }
.catalog-page img { max-height: 700px; object-fit: contain; background: #fff; }

.service-strip { padding: 72px 0; color: var(--cream); background: var(--forest-deep); }
.service-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.service-grid article { min-height: 190px; padding: 8px 30px; border-left: 1px solid rgba(244, 240, 229, .14); }
.service-grid article:last-child { border-right: 1px solid rgba(244, 240, 229, .14); }
.service-grid span { color: #d7b47b; font-family: Georgia, serif; }
.service-grid h3 { margin: 16px 0 10px; font-size: 1.14rem; }
.service-grid p { color: rgba(244, 240, 229, .62); font-size: .88rem; }

.applications { background: var(--cream); }
.application-summary { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.application-summary article { min-height: 260px; padding: 30px; background: rgba(255, 254, 249, .58); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.application-summary span { color: var(--brass); font-size: .76rem; font-weight: 800; letter-spacing: .12em; }
.application-summary h3 { margin: 15px 0 12px; color: var(--forest-deep); font-size: 1.3rem; line-height: 1.45; }
.application-summary p { color: var(--muted); font-size: .92rem; }
.reference-panel { display: grid; grid-template-columns: minmax(260px, 32%) minmax(0, 68%); margin-top: 52px; background: var(--forest); color: var(--cream); }
.reference-intro { padding: 42px; border-right: 1px solid rgba(244, 240, 229, .16); }
.reference-intro h3 { font-size: 1.8rem; line-height: 1.35; }
.reference-intro > p:last-child { margin-top: 18px; color: rgba(244, 240, 229, .62); font-size: .92rem; }
.reference-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.reference-list article { display: grid; grid-template-columns: 72px 1fr; gap: 16px; padding: 27px 28px; border-right: 1px solid rgba(244, 240, 229, .14); border-bottom: 1px solid rgba(244, 240, 229, .14); }
.reference-list time { color: #d7b47b; font: 700 .78rem/1.5 Georgia, serif; }
.reference-list h4 { margin-bottom: 5px; font-size: .98rem; }
.reference-list p { color: rgba(244, 240, 229, .6); font-size: .82rem; line-height: 1.65; }

.contact { background: var(--paper); }
.contact-grid { display: grid; grid-template-columns: minmax(0, 30fr) minmax(0, 70fr); gap: 70px; }
.contact-title p:last-child { margin-top: 20px; color: var(--muted); font-size: .9rem; }
.contact-list { border-top: 2px solid var(--forest); }
.contact-list > div { display: grid; grid-template-columns: 150px 1fr; border-bottom: 1px solid var(--line); }
.contact-list dt, .contact-list dd { padding: 17px 20px; }
.contact-list dt { color: var(--forest); font-weight: 800; }
.contact-list dd { color: #4e5c55; overflow-wrap: anywhere; }
.contact-list a { color: var(--forest); text-decoration: underline; text-underline-offset: 3px; }

.page-cta { padding: 58px 0; color: var(--cream); background: var(--forest-soft); }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.cta-inner p { color: rgba(244, 240, 229, .62); font-size: .78rem; letter-spacing: .12em; }
.cta-inner h2 { font-size: 1.8rem; }
.site-footer { padding: 42px 0; color: rgba(244, 240, 229, .62); background: #071d18; text-align: center; font-size: .86rem; }
.site-footer strong { display: block; margin-bottom: 8px; color: var(--cream); }
.site-footer a { color: var(--cream); }
.backtop { position: fixed; right: 22px; bottom: 22px; z-index: 30; padding: 10px 13px; border: 0; color: var(--cream); background: var(--forest); box-shadow: var(--shadow); cursor: pointer; opacity: 0; pointer-events: none; transform: translateY(10px); transition: .2s; }
.backtop.visible { opacity: 1; pointer-events: auto; transform: none; }

@media (max-width: 1080px) {
  .site-nav { position: absolute; top: 100%; left: 0; right: 0; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 12px 24px 20px; background: var(--paper); border-bottom: 1px solid var(--line); }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 11px 0; }
  .nav-back { margin-top: 8px; text-align: center; }
  .menu-toggle { display: block; }
  .hero { min-height: 0; grid-template-columns: 1fr; }
  .hero-copy { min-height: 520px; padding: 70px 24px; }
  .hero-image { min-height: 440px; }
  .facts-grid { grid-template-columns: repeat(3, 1fr); }
  .fact:nth-child(4) { border-left: none; }
  .intro-grid, .capacity-grid, .contact-grid { grid-template-columns: 1fr; gap: 42px; }
  .section-title { padding: 0; border: 0; }
  .solution-layout { grid-template-columns: 1fr; }
  .solution-feature { min-height: 460px; }
  .service-grid { grid-template-columns: repeat(2, 1fr); gap: 42px 0; }
  .application-summary { grid-template-columns: 1fr; }
  .application-summary article { min-height: 0; }
  .reference-panel { grid-template-columns: 1fr; }
  .reference-intro { border-right: 0; border-bottom: 1px solid rgba(244, 240, 229, .16); }
  .catalog-page { max-width: 600px; margin: 0 auto; }
}

@media (max-width: 640px) {
  .shell { width: min(100% - 36px, 1180px); }
  .header-inner { gap: 12px; padding: 9px 0; }
  .expo-brand { min-width: 0; gap: 9px; }
  .expo-name { max-width: 205px; font-size: .86rem; line-height: 1.38; }
  .menu-toggle { flex: 0 0 auto; }
  .hero-copy { min-height: 460px; padding: 54px 18px; }
  h1 { font-size: 2.35rem; }
  .hero-image { min-height: 340px; }
  .logo-card { right: 18px; bottom: 18px; width: calc(100% - 36px); }
  .facts-grid { grid-template-columns: repeat(2, 1fr); }
  .fact { min-height: 102px; padding: 18px; }
  .fact:nth-child(3), .fact:nth-child(5) { border-left: none; }
  .section { padding: 72px 0; }
  .copy-columns { grid-template-columns: 1fr; gap: 16px; }
  .section-heading { display: block; }
  .section-heading > p { margin-top: 18px; }
  .solution-feature { min-height: 430px; }
  .solution-feature figcaption { left: 24px; right: 24px; bottom: 24px; }
  .solution-list article { grid-template-columns: 38px 1fr; padding: 26px 22px; }
  .scene-grid { grid-template-columns: 1fr; grid-template-rows: 280px 220px 220px; }
  .scene-grid .scene-main { grid-row: auto; }
  .capacity-list li { grid-template-columns: 1fr; gap: 4px; }
  .service-grid { grid-template-columns: 1fr; gap: 0; }
  .service-grid article { min-height: 0; padding: 26px 10px; border-left: 0; border-bottom: 1px solid rgba(244, 240, 229, .14); }
  .service-grid article:last-child { border-right: 0; border-bottom: 0; }
  .reference-intro { padding: 30px 24px; }
  .reference-list { grid-template-columns: 1fr; }
  .reference-list article { grid-template-columns: 66px 1fr; padding: 24px; border-right: 0; }
  .contact-list > div { grid-template-columns: 1fr; }
  .contact-list dt { padding-bottom: 0; }
  .contact-list dd { padding-top: 4px; }
  .cta-inner { display: grid; }
  .button { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}