:root {
  --ink: #142226;
  --muted: #5f6c6f;
  --paper: #f7f8f5;
  --white: #ffffff;
  --dark: #0b2024;
  --dark-2: #123239;
  --green: #0b7d72;
  --green-light: #b8ded6;
  --line: #dce4e1;
  --orange: #d88239;
  --max: 1200px;
  --radius: 18px;
  --shadow: 0 24px 70px rgba(18, 34, 38, .12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }
.container { width: min(calc(100% - 48px), var(--max)); margin-inline: auto; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.skip-link {
  position: fixed; left: 16px; top: -80px; z-index: 1000;
  padding: 10px 16px; background: white; border-radius: 8px;
}
.skip-link:focus { top: 16px; }

.site-header {
  position: absolute; top: 0; left: 0; right: 0; z-index: 50;
  color: white; border-bottom: 1px solid rgba(255,255,255,.16);
}
.header-inner { min-height: 86px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 12px; letter-spacing: .02em; }
.brand-mark {
  width: 42px; height: 42px; border-radius: 10px; display: grid; place-items: center;
  background: var(--green); color: white; flex: 0 0 auto;
}
.brand-mark svg { width: 28px; fill: currentColor; }
.brand strong { display: block; font-size: 15px; line-height: 1.2; }
.brand small { display: block; color: rgba(255,255,255,.68); font-size: 11px; margin-top: 4px; text-transform: uppercase; letter-spacing: .13em; }
.primary-nav { display: flex; align-items: center; gap: 22px; font-size: 13px; font-weight: 600; }
.primary-nav a { color: rgba(255,255,255,.78); transition: color .2s ease; }
.primary-nav a:hover, .primary-nav a.active { color: white; }
.nav-cta { padding: 11px 18px; border: 1px solid rgba(255,255,255,.55); border-radius: 999px; }
.menu-toggle { display: none; background: transparent; border: 0; color: white; padding: 10px; }
.menu-toggle > span:not(.sr-only) { display: block; width: 24px; height: 2px; background: currentColor; margin: 5px 0; }

.hero {
  min-height: 780px; display: flex; align-items: center; position: relative; overflow: hidden;
  color: white; background: var(--dark);
}
.hero-home { background: url("images/cooling-tower.jpg") center 42%/cover no-repeat; }
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(4,20,24,.94) 0%, rgba(4,20,24,.78) 43%, rgba(4,20,24,.20) 100%),
              linear-gradient(0deg, rgba(4,20,24,.50), transparent 45%);
}
.hero-content { padding: 150px 0 100px; position: relative; }
.eyebrow {
  margin: 0 0 18px; color: var(--green-light); font-size: 12px; font-weight: 800;
  text-transform: uppercase; letter-spacing: .18em;
}
.eyebrow.dark { color: var(--green); }
.hero h1, .page-hero h1, .contact-hero h1 {
  margin: 0; max-width: 900px; font-size: clamp(44px, 6vw, 82px);
  line-height: 1.02; letter-spacing: -.045em; font-weight: 650;
  overflow-wrap: break-word;
}
.hero-copy { max-width: 680px; margin: 28px 0 0; color: rgba(255,255,255,.78); font-size: 18px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }
.hero-note { margin: 32px 0 0; color: rgba(255,255,255,.55); font-size: 12px; letter-spacing: .05em; }
.button {
  display: inline-flex; align-items: center; justify-content: center; min-height: 50px;
  padding: 13px 22px; border-radius: 999px; border: 1px solid transparent;
  font-size: 13px; font-weight: 800; letter-spacing: .01em; cursor: pointer;
  transition: transform .2s ease, background .2s ease, color .2s ease;
}
.button:hover { transform: translateY(-2px); }
.button-primary { color: white; background: var(--green); }
.button-primary:hover { background: #08685f; }
.button-ghost { color: white; border-color: rgba(255,255,255,.44); background: rgba(255,255,255,.04); backdrop-filter: blur(8px); }
.button-light { color: var(--dark); background: white; }
.button-outline-dark { border-color: var(--ink); color: var(--ink); }

.trust-strip { background: white; border-bottom: 1px solid var(--line); }
.trust-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.trust-grid > div { padding: 28px 32px; border-right: 1px solid var(--line); }
.trust-grid > div:first-child { border-left: 1px solid var(--line); }
.trust-grid strong { display: block; font-size: 27px; letter-spacing: -.04em; }
.trust-grid span { color: var(--muted); font-size: 12px; }

.section { padding: 112px 0; }
.section-dark { color: white; background: var(--dark); }
.section-heading { max-width: 820px; margin-bottom: 48px; }
.section-heading h2, .feature-copy h2, .content-grid h2, .contact-section h2 {
  margin: 0; font-size: clamp(34px, 4vw, 58px); line-height: 1.06; letter-spacing: -.04em; font-weight: 620;
}
.section-heading > p:last-child, .split-heading > p { color: var(--muted); }
.split-heading { max-width: none; display: grid; grid-template-columns: 1.2fr .8fr; align-items: end; gap: 64px; }
.split-heading > p { margin: 0 0 8px; }
.section-dark .section-heading > p:last-child { color: rgba(255,255,255,.65); }

.solution-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 18px; }
.solution-card {
  min-height: 360px; position: relative; overflow: hidden; border-radius: var(--radius);
  background: var(--dark); color: white; isolation: isolate;
}
.solution-card-large { grid-row: span 2; min-height: 738px; }
.solution-card img { width: 100%; height: 100%; object-fit: cover; position: absolute; inset: 0; z-index: -2; transition: transform .55s ease; }
.solution-card::after {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: linear-gradient(0deg, rgba(4,18,22,.94), rgba(4,18,22,.08) 72%);
}
.solution-card:hover img { transform: scale(1.04); }
.solution-copy { position: absolute; inset: auto 0 0; padding: 30px; }
.solution-copy span { color: var(--green-light); font-size: 12px; font-weight: 800; }
.solution-copy h3 { margin: 9px 0 8px; font-size: 27px; letter-spacing: -.03em; }
.solution-copy p { margin: 0 0 18px; max-width: 520px; color: rgba(255,255,255,.72); font-size: 14px; }
.solution-copy b { font-size: 12px; color: white; }

.feature-layout { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 70px; }
.feature-layout.reverse .feature-copy { order: 2; }
.feature-layout.reverse .feature-media { order: 1; }
.feature-media img { width: 100%; min-height: 420px; object-fit: cover; border-radius: var(--radius); }
.feature-copy p { color: rgba(255,255,255,.68); }
.feature-layout:not(.section-dark) .feature-copy p { color: var(--muted); }
.check-list { list-style: none; padding: 0; margin: 28px 0; display: grid; gap: 13px; }
.check-list li { position: relative; padding-left: 27px; color: inherit; }
.check-list li::before {
  content: "✓"; position: absolute; left: 0; top: 0; color: var(--green);
  width: 18px; height: 18px; font-size: 12px; font-weight: 900;
}
.text-link { color: var(--green-light); font-weight: 800; font-size: 13px; }
.feature-layout:not(.section-dark) .text-link { color: var(--green); }
.small-note { font-size: 12px; color: var(--muted); }

.project-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.project-card { margin: 0; position: relative; min-height: 320px; overflow: hidden; border-radius: var(--radius); background: #d9dedd; }
.project-card.tall { grid-row: span 2; min-height: 656px; }
.project-card img { width: 100%; height: 100%; object-fit: cover; position: absolute; inset: 0; }
.project-card::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(4,18,22,.82), transparent 58%); }
.project-card figcaption { position: absolute; z-index: 2; left: 24px; right: 24px; bottom: 22px; color: white; }
.project-card figcaption span { display: block; color: #b6ddd6; font-size: 11px; text-transform: uppercase; letter-spacing: .14em; }
.project-card figcaption strong { display: block; margin-top: 5px; font-size: 16px; }
.project-grid-full { grid-template-columns: repeat(4, 1fr); }
.section-action { margin-top: 36px; }

.process-section { background: white; }
.process-grid { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: rgba(255,255,255,.15); }
.process-grid li, .process-grid > div { background: var(--dark); padding: 28px; min-height: 235px; }
.process-section .process-grid li { background: #f0f3f0; }
.process-grid span { color: var(--green); font-size: 12px; font-weight: 800; }
.process-grid h3 { font-size: 21px; margin: 36px 0 8px; }
.process-grid p { color: var(--muted); font-size: 13px; margin: 0; }
.section-dark .process-grid p { color: rgba(255,255,255,.62); }

.cta-band { color: white; background: var(--green); }
.cta-inner { min-height: 280px; display: flex; align-items: center; justify-content: space-between; gap: 40px; }
.cta-inner h2 { margin: 0; font-size: clamp(34px, 4vw, 56px); line-height: 1; letter-spacing: -.04em; }
.cta-inner .eyebrow { color: rgba(255,255,255,.72); }

.site-footer { color: rgba(255,255,255,.72); background: #07181b; padding: 72px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.15fr; gap: 48px; }
.footer-grid h3 { color: white; font-size: 13px; margin: 0 0 18px; }
.footer-grid > div > a:not(.brand), .footer-grid > div > p { display: block; margin: 0 0 10px; font-size: 13px; }
.footer-company { margin-top: 20px !important; max-width: 340px; font-size: 12px !important; }
.footer-brand small { color: rgba(255,255,255,.5); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); margin-top: 52px; padding-top: 22px; display: flex; justify-content: space-between; gap: 24px; font-size: 11px; color: rgba(255,255,255,.45); }

.page-hero {
  min-height: 610px; padding: 150px 0 90px; display: flex; align-items: center; color: white; position: relative; isolation: isolate;
  background: var(--dark-2);
}
.page-hero::before {
  content: ""; position: absolute; inset: 0; z-index: -2;
  background-image: var(--page-image); background-size: cover; background-position: center;
}
.page-hero::after { content: ""; position: absolute; inset: 0; z-index: -1; background: linear-gradient(90deg, rgba(5,22,27,.94), rgba(5,22,27,.48)); }
.page-hero p:not(.eyebrow) { max-width: 650px; color: rgba(255,255,255,.72); font-size: 17px; }
.page-hero .button { margin-top: 22px; }

.content-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 80px; align-items: start; }
.lead { color: var(--ink) !important; font-size: 19px; line-height: 1.6; }
.content-grid > div > p:not(.eyebrow) { color: var(--muted); }
.spec-panel { padding: 34px; border-radius: var(--radius); color: white; background: var(--dark); position: sticky; top: 28px; }
.spec-panel h3 { margin: 0 0 22px; font-size: 20px; }
.spec-panel ul { margin: 0; padding: 0; list-style: none; }
.spec-panel li { padding: 11px 0; border-bottom: 1px solid rgba(255,255,255,.12); color: rgba(255,255,255,.7); font-size: 13px; }
.spec-panel li:last-child { border-bottom: 0; }
.feature-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.feature-tile { padding: 32px; min-height: 220px; border: 1px solid rgba(255,255,255,.14); border-radius: var(--radius); background: rgba(255,255,255,.025); }
.feature-tile span { color: var(--green-light); font-size: 12px; font-weight: 800; }
.feature-tile h3 { margin: 42px 0 10px; font-size: 23px; }
.feature-tile p { color: rgba(255,255,255,.62); font-size: 13px; margin: 0; }

.contact-hero { padding: 170px 0 86px; color: white; background: var(--dark); }
.contact-hero-grid { display: grid; grid-template-columns: 1fr .65fr; gap: 70px; align-items: end; }
.contact-hero h1 { font-size: clamp(42px, 5vw, 72px); }
.contact-hero p:not(.eyebrow) { color: rgba(255,255,255,.65); max-width: 650px; }
.contact-cards { display: grid; border-top: 1px solid rgba(255,255,255,.2); }
.contact-cards > * { padding: 18px 0; border-bottom: 1px solid rgba(255,255,255,.2); }
.contact-cards span { display: block; color: var(--green-light); font-size: 11px; text-transform: uppercase; letter-spacing: .15em; }
.contact-cards strong { display: block; margin-top: 4px; font-size: 16px; }
.contact-section { background: white; }
.contact-layout { display: grid; grid-template-columns: 1.2fr .8fr; gap: 70px; align-items: start; }
.form-intro { color: var(--muted); }
.rfq-form { margin-top: 34px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.rfq-form label { display: grid; gap: 8px; font-size: 12px; font-weight: 750; }
.rfq-form label.full { grid-column: 1 / -1; }
.rfq-form input, .rfq-form textarea {
  width: 100%; border: 1px solid #cbd6d2; border-radius: 9px; background: #fbfcfa;
  padding: 13px 14px; color: var(--ink); outline: none;
}
.rfq-form input:focus, .rfq-form textarea:focus { border-color: var(--green); box-shadow: 0 0 0 3px rgba(11,125,114,.12); }
.rfq-form .button { margin-top: 22px; }
.form-status { min-height: 24px; color: var(--green); font-size: 13px; }
.rfq-guide { padding: 34px; border-radius: var(--radius); background: #edf2ef; }
.rfq-guide h3 { margin: 0 0 24px; font-size: 22px; }
.rfq-guide ol { margin: 0; padding: 0; list-style: none; display: grid; gap: 16px; }
.rfq-guide li { display: flex; gap: 14px; align-items: baseline; font-size: 14px; }
.rfq-guide li span { color: var(--green); font-size: 11px; font-weight: 800; }

@media (max-width: 980px) {
  .primary-nav {
    display: none; position: absolute; top: 86px; left: 24px; right: 24px;
    padding: 22px; border-radius: 14px; background: var(--dark); flex-direction: column;
    align-items: stretch; gap: 4px; box-shadow: var(--shadow);
  }
  .primary-nav.open { display: flex; }
  .primary-nav a { padding: 10px; }
  .nav-cta { text-align: center; margin-top: 8px; }
  .menu-toggle { display: block; }
  .trust-grid { grid-template-columns: 1fr 1fr; }
  .trust-grid > div:nth-child(2) { border-right: 0; }
  .split-heading, .feature-layout, .content-grid, .contact-hero-grid, .contact-layout { grid-template-columns: 1fr; }
  .split-heading { gap: 20px; }
  .feature-layout.reverse .feature-copy, .feature-layout.reverse .feature-media { order: initial; }
  .solution-grid { grid-template-columns: 1fr 1fr; }
  .solution-card-large { grid-row: auto; grid-column: 1 / -1; min-height: 500px; }
  .project-grid, .project-grid-full { grid-template-columns: 1fr 1fr; }
  .project-card.tall { grid-row: auto; min-height: 360px; }
  .process-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .spec-panel { position: static; }
}

@media (max-width: 640px) {
  .container { width: min(calc(100% - 30px), var(--max)); }
  .site-header { position: absolute; }
  .header-inner { min-height: 74px; }
  .brand strong { font-size: 12px; }
  .brand small { font-size: 9px; }
  .brand-mark { width: 36px; height: 36px; }
  .primary-nav { top: 74px; left: 15px; right: 15px; }
  .hero { min-height: 680px; }
  .hero-content { padding-top: 125px; }
  .hero h1, .page-hero h1, .contact-hero h1 { font-size: 40px; }
  .hero-copy { font-size: 15px; }
  .hero-actions .button { width: 100%; }
  .section { padding: 76px 0; }
  .trust-grid { grid-template-columns: 1fr 1fr; }
  .trust-grid > div { padding: 22px 16px; }
  .solution-grid, .feature-grid, .project-grid, .project-grid-full, .process-grid, .form-grid, .footer-grid { grid-template-columns: 1fr; }
  .solution-card { min-height: 400px; }
  .solution-card-large { min-height: 520px; }
  .project-card, .project-card.tall { min-height: 390px; }
  .feature-media img { min-height: 300px; }
  .cta-inner { padding: 65px 0; align-items: flex-start; flex-direction: column; }
  .cta-inner .button { width: 100%; }
  .page-hero { min-height: 590px; padding-top: 135px; }
  .contact-hero { padding-top: 135px; }
  .footer-grid { gap: 32px; }
  .footer-bottom { flex-direction: column; }
}

@media (max-width: 430px) {
  .trust-grid { grid-template-columns: 1fr; }
  .trust-grid > div { border-right: 0; border-left: 0; }
}

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

/* en-sync:begin —— 中英文同步生成页所需样式 */
.project-card-link{display:block;height:100%;text-decoration:none;color:inherit}
.project-card-link .project-card{height:100%}
.case-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:56px;align-items:start}
.case-body{max-width:760px}
.case-body p{margin:0 0 18px;font-size:17px;line-height:1.75;color:var(--ink)}
.case-meta{font-size:12px!important;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)!important;margin-bottom:22px!important}
.case-figure{margin:28px 0;border-radius:var(--radius);overflow:hidden;background:#eef2f0;box-shadow:0 10px 40px rgba(18,34,38,.08)}
.case-figure img{display:block;width:100%;height:auto}
.case-side-box{position:sticky;top:110px;padding:28px;border:1px solid var(--line);border-radius:var(--radius);background:var(--white)}
.case-side-box h3{margin:0 0 10px;font-size:20px}
.case-side-box p{margin:0 0 18px;color:var(--muted);line-height:1.7;font-size:15px}
.case-side-box .text-link{display:inline-block;margin-top:16px;font-size:14px}
.pager{display:flex;gap:8px;margin-top:36px;flex-wrap:wrap}
.pager-link{display:inline-flex;align-items:center;justify-content:center;min-width:42px;height:42px;padding:0 14px;border:1px solid var(--line);border-radius:999px;color:var(--ink);text-decoration:none;font-size:14px}
.pager-link.is-current{background:var(--dark);color:#fff;border-color:var(--dark)}
@media (max-width:900px){.case-layout{grid-template-columns:1fr;gap:32px}.case-side-box{position:static}}
/* en-sync:end */