:root {
  color-scheme: light;
  --ink: #10223a;
  --muted: #5d6e83;
  --line: rgba(17, 41, 72, 0.12);
  --blue: #0a6fb8;
  --cyan: #00a7c8;
  --deep: #082642;
  --warm: #b88432;
  --green: #4b8d72;
  --paper: #f7fbfd;
  --white: #ffffff;
  --shadow: 0 24px 70px rgba(15, 44, 77, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
  letter-spacing: 0;
}

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 20;
  width: 100%;
  height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(20px, 5vw, 72px);
  color: var(--white);
  transition: background 180ms ease, box-shadow 180ms ease, color 180ms ease;
}

.site-header.is-solid {
  background: rgba(255, 255, 255, 0.94);
  color: var(--ink);
  box-shadow: 0 12px 34px rgba(18, 42, 70, 0.11);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 220px;
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: inline-grid;
  place-items: center;
  border-radius: 8px;
  background: linear-gradient(145deg, #0b75bd, #12b4cd);
  color: #fff;
  font-weight: 800;
  box-shadow: 0 10px 28px rgba(0, 118, 184, 0.28);
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 17px;
}

.brand small {
  margin-top: 2px;
  color: currentColor;
  opacity: 0.68;
  font-size: 10px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(18px, 3vw, 36px);
  font-size: 14px;
}

.nav-links a {
  opacity: 0.86;
}

.nav-links a:hover {
  opacity: 1;
}

.nav-action,
.primary-btn,
.ghost-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  border-radius: 8px;
  font-weight: 700;
  white-space: nowrap;
}

.nav-action {
  border: 1px solid currentColor;
  color: currentColor;
  font-size: 14px;
}

.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  padding: 132px clamp(20px, 6vw, 92px) 96px;
  overflow: hidden;
  color: var(--white);
  background: var(--deep);
}

.hero-media,
.hero-shade {
  position: absolute;
  inset: 0;
}

.hero-media {
  background-image: url("./assets/hero-industrial-cooling.png");
  background-size: cover;
  background-position: center;
  transform: scale(1.02);
}

.hero-shade {
  background:
    linear-gradient(90deg, rgba(5, 23, 40, 0.88) 0%, rgba(6, 38, 67, 0.7) 39%, rgba(8, 57, 90, 0.12) 76%),
    linear-gradient(180deg, rgba(3, 18, 34, 0.22) 0%, rgba(3, 18, 34, 0.62) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  width: min(760px, 100%);
}

.eyebrow,
.section-kicker {
  margin: 0 0 16px;
  color: var(--cyan);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  max-width: 760px;
  font-size: clamp(42px, 6vw, 76px);
  line-height: 1.08;
  font-weight: 850;
}

.hero-lead {
  max-width: 640px;
  margin: 26px 0 0;
  color: rgba(255, 255, 255, 0.84);
  font-size: clamp(17px, 2vw, 22px);
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.primary-btn {
  color: #fff;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  box-shadow: 0 20px 42px rgba(0, 122, 190, 0.26);
}

.primary-btn.light {
  color: var(--deep);
  background: #fff;
  box-shadow: none;
}

.ghost-btn {
  border: 1px solid rgba(255, 255, 255, 0.54);
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(10px);
}

.hero-panel {
  position: absolute;
  right: clamp(20px, 6vw, 84px);
  bottom: 38px;
  z-index: 3;
  width: min(380px, calc(100% - 40px));
  padding: 24px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 8px;
  background: rgba(5, 28, 49, 0.72);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.28);
  backdrop-filter: blur(18px);
}

.hero-panel span,
.hero-panel strong {
  display: block;
}

.hero-panel span {
  color: #8ee6f0;
  font-size: 13px;
  font-weight: 800;
}

.hero-panel strong {
  margin-top: 8px;
  font-size: 24px;
}

.hero-panel p {
  margin: 10px 0 0;
  color: rgba(255, 255, 255, 0.76);
  line-height: 1.7;
}

.fact-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  max-width: 1180px;
  margin: -36px auto 0;
  position: relative;
  z-index: 5;
  padding: 0 clamp(20px, 4vw, 40px);
}

.fact-strip article {
  min-height: 132px;
  padding: 30px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: var(--shadow);
}

.fact-strip article:first-child {
  border-radius: 8px 0 0 8px;
}

.fact-strip article:last-child {
  border-radius: 0 8px 8px 0;
}

.fact-strip strong {
  display: block;
  margin-bottom: 10px;
  color: var(--deep);
  font-size: 22px;
}

.fact-strip span {
  color: var(--muted);
  line-height: 1.7;
}

.section {
  padding: clamp(72px, 9vw, 128px) clamp(20px, 6vw, 92px);
}

.split {
  display: grid;
  grid-template-columns: minmax(260px, 0.82fr) minmax(320px, 1.18fr);
  gap: clamp(34px, 7vw, 96px);
  max-width: 1180px;
  margin: 0 auto;
}

.section h2,
.cta h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.18;
}

.profile-copy {
  display: grid;
  gap: 22px;
}

.profile-copy p {
  margin: 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.95;
}

.section-heading {
  max-width: 1180px;
  margin: 0 auto 34px;
}

.solution-grid {
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.solution-card,
.article-grid article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 16px 48px rgba(31, 66, 99, 0.08);
}

.solution-card {
  min-height: 286px;
  padding: 28px;
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.solution-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 153, 194, 0.38);
  box-shadow: 0 26px 60px rgba(31, 66, 99, 0.15);
}

.card-index {
  color: var(--warm);
  font-size: 13px;
  font-weight: 900;
}

.solution-card h3,
.article-grid h3 {
  margin: 18px 0 12px;
  font-size: 22px;
  line-height: 1.35;
}

.solution-card p,
.article-grid p {
  margin: 0;
  color: var(--muted);
  line-height: 1.85;
}

.service-band {
  color: #fff;
  background:
    linear-gradient(135deg, rgba(7, 38, 66, 0.96), rgba(5, 86, 111, 0.9)),
    linear-gradient(90deg, var(--deep), var(--blue));
}

.products {
  background:
    linear-gradient(180deg, #ffffff 0%, #f2f9fb 100%);
}

.product-layout {
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(320px, 0.9fr) minmax(420px, 1.1fr);
  gap: 20px;
}

.product-feature {
  min-height: 520px;
  padding: 34px;
  border-radius: 8px;
  color: #fff;
  background:
    linear-gradient(160deg, rgba(7, 40, 68, 0.96), rgba(0, 132, 176, 0.88)),
    url("./assets/hero-industrial-cooling.png") center/cover;
  box-shadow: var(--shadow);
}

.product-feature span,
.case-grid span {
  display: inline-flex;
  color: #92edf5;
  font-size: 13px;
  font-weight: 900;
}

.product-feature h3 {
  margin: 18px 0 16px;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.18;
}

.product-feature p {
  margin: 0;
  color: rgba(255, 255, 255, 0.8);
  font-size: 17px;
  line-height: 1.9;
}

.product-feature ul {
  display: grid;
  gap: 13px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.product-feature li {
  position: relative;
  padding-left: 18px;
  color: rgba(255, 255, 255, 0.86);
  line-height: 1.7;
}

.product-feature li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--warm);
}

.product-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.product-grid article,
.case-grid article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 16px 44px rgba(31, 66, 99, 0.08);
}

.product-grid article {
  min-height: 250px;
  padding: 28px;
}

.product-grid h3,
.case-grid h3 {
  margin: 0 0 14px;
  font-size: 23px;
  line-height: 1.32;
}

.product-grid p,
.case-grid p {
  margin: 0;
  color: var(--muted);
  line-height: 1.85;
}

.cases {
  background:
    linear-gradient(90deg, rgba(238, 246, 249, 0.86), rgba(255, 255, 255, 0.96));
}

.case-grid {
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.case-grid article {
  min-height: 300px;
  padding: 28px;
}

.case-grid span {
  margin-bottom: 18px;
  color: var(--green);
}

.service-band .section-kicker {
  color: #8ee6f0;
}

.timeline {
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  overflow: hidden;
}

.timeline article {
  min-height: 230px;
  padding: 30px;
  background: rgba(255, 255, 255, 0.08);
}

.timeline span {
  display: inline-flex;
  align-items: center;
  height: 36px;
  color: #ffffff;
  font-size: 21px;
  font-weight: 800;
}

.timeline p {
  margin: 22px 0 0;
  color: rgba(255, 255, 255, 0.76);
  line-height: 1.85;
}

.articles {
  background: #eef6f9;
}

.article-grid {
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.article-grid article {
  padding: 30px;
}

.article-grid time {
  color: var(--green);
  font-size: 13px;
  font-weight: 800;
}

.cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: clamp(58px, 7vw, 88px) clamp(20px, 6vw, 92px);
  color: #fff;
  background:
    linear-gradient(110deg, rgba(5, 31, 52, 0.96), rgba(8, 112, 159, 0.88)),
    url("./assets/hero-industrial-cooling.png") center/cover;
}

.cta > div {
  max-width: 780px;
}

.cta p:not(.section-kicker) {
  margin: 18px 0 0;
  color: rgba(255, 255, 255, 0.78);
  font-size: 17px;
  line-height: 1.8;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 24px clamp(20px, 6vw, 92px);
  color: #6a7a8c;
  background: #fff;
  border-top: 1px solid var(--line);
  font-size: 13px;
}

@media (max-width: 1040px) {
  .nav-links {
    display: none;
  }

  .hero {
    min-height: 840px;
    align-items: flex-start;
  }

  .hero-panel {
    left: 20px;
    right: auto;
  }

  .fact-strip,
  .solution-grid,
  .timeline,
  .article-grid,
  .case-grid {
    grid-template-columns: 1fr 1fr;
  }

  .product-layout {
    grid-template-columns: 1fr;
  }

  .fact-strip article:first-child,
  .fact-strip article:last-child {
    border-radius: 8px;
  }

  .split {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  .site-header {
    height: 66px;
    padding: 0 16px;
  }

  .brand {
    min-width: auto;
  }

  .brand small,
  .nav-action {
    display: none;
  }

  .hero {
    min-height: 780px;
    padding: 104px 18px 88px;
  }

  .hero h1 {
    font-size: 40px;
  }

  .hero-panel {
    bottom: 20px;
    width: calc(100% - 36px);
    padding: 20px;
  }

  .fact-strip,
  .solution-grid,
  .timeline,
  .article-grid,
  .case-grid,
  .product-grid {
    grid-template-columns: 1fr;
  }

  .fact-strip {
    margin-top: 0;
    padding: 0;
  }

  .fact-strip article {
    border-radius: 0;
    box-shadow: none;
  }

  .section {
    padding: 64px 18px;
  }

  .solution-card,
  .timeline article,
  .article-grid article {
    min-height: auto;
    padding: 24px;
  }

  .cta,
  .site-footer {
    flex-direction: column;
    align-items: flex-start;
    padding-left: 18px;
    padding-right: 18px;
  }
}