:root {
  color-scheme: light;
  --ink: #17212b;
  --muted: #5f6e7d;
  --line: #dce5ec;
  --paper: #f6f8fa;
  --white: #ffffff;
  --blue: #0f6fbd;
  --green: #0c8f79;
  --gold: #d29d2c;
  --dark: #14202b;
  --shadow: 0 22px 60px rgba(28, 44, 58, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Arial, "Microsoft YaHei", "PingFang SC", sans-serif;
  line-height: 1.6;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: minmax(230px, 1fr) auto auto;
  align-items: center;
  gap: 24px;
  padding: 16px clamp(20px, 5vw, 72px);
  background: rgba(246, 248, 250, 0.9);
  border-bottom: 1px solid rgba(220, 229, 236, 0.85);
  backdrop-filter: blur(18px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--blue), var(--green));
  color: var(--white);
  font-weight: 800;
}

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

.brand strong {
  font-size: 15px;
}

.brand small {
  color: var(--muted);
  font-size: 12px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 26px;
  color: var(--muted);
  font-size: 14px;
}

.nav a:hover {
  color: var(--blue);
}

.lang-toggle {
  min-width: 48px;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  color: var(--ink);
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(28, 44, 58, 0.08);
}

.hero {
  position: relative;
  min-height: 680px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 420px);
  align-items: end;
  gap: clamp(24px, 5vw, 72px);
  overflow: hidden;
  padding: 94px clamp(20px, 5vw, 72px) 76px;
  background:
    linear-gradient(120deg, rgba(20, 32, 43, 0.95), rgba(17, 72, 95, 0.86)),
    radial-gradient(circle at 80% 20%, rgba(210, 157, 44, 0.42), transparent 34%);
  color: var(--white);
}

.hero-bg {
  position: absolute;
  inset: 0;
  opacity: 0.55;
  pointer-events: none;
}

.hero-bg span {
  position: absolute;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 8px;
  transform: rotate(-8deg);
}

.hero-bg span:nth-child(1) {
  width: 34vw;
  height: 34vw;
  right: -8vw;
  top: 90px;
}

.hero-bg span:nth-child(2) {
  width: 240px;
  height: 420px;
  right: 18vw;
  bottom: 70px;
}

.hero-bg span:nth-child(3) {
  width: 520px;
  height: 220px;
  left: -120px;
  bottom: 40px;
}

.hero-content,
.hero-panel {
  position: relative;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--green);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: #7ee0cc;
}

.hero h1 {
  max-width: 920px;
  margin: 0;
  font-size: clamp(40px, 7vw, 78px);
  line-height: 1.04;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 760px;
  margin: 28px 0 0;
  color: rgba(255, 255, 255, 0.82);
  font-size: 18px;
}

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

.primary-action,
.secondary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 8px;
  font-weight: 800;
}

.primary-action {
  background: var(--gold);
  color: #111820;
}

.secondary-action {
  border: 1px solid rgba(255, 255, 255, 0.36);
  color: var(--white);
}

.hero-panel {
  display: grid;
  gap: 14px;
}

.hero-panel div {
  padding: 20px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(12px);
}

.hero-panel strong {
  display: block;
  font-size: 26px;
  line-height: 1.2;
}

.hero-panel span {
  color: rgba(255, 255, 255, 0.72);
  font-size: 14px;
}

.section {
  padding: 82px clamp(20px, 5vw, 72px);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 32px;
}

.section-heading h2,
.quality h2,
.contact h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.16;
  letter-spacing: 0;
}

.intro {
  display: grid;
  grid-template-columns: minmax(260px, 0.8fr) minmax(320px, 1.2fr);
  gap: 52px;
  align-items: start;
  background: var(--white);
}

.intro p:last-child {
  margin: 42px 0 0;
  color: var(--muted);
  font-size: 18px;
}

.product-band {
  background: #edf3f6;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.product-card {
  min-height: 300px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: 0 18px 48px rgba(28, 44, 58, 0.08);
}

.product-icon {
  color: var(--blue);
  font-size: 13px;
  font-weight: 900;
}

.product-card h3,
.capability-item h3,
.solution-layout h3 {
  margin: 18px 0 10px;
  font-size: 21px;
  line-height: 1.25;
}

.product-card p,
.capability-item p,
.solution-layout p,
.quality-copy p,
.contact p {
  margin: 0;
  color: var(--muted);
}

.split {
  display: grid;
  grid-template-columns: minmax(260px, 0.85fr) minmax(320px, 1.15fr);
  gap: 52px;
  background: var(--white);
}

.capability-list {
  display: grid;
  gap: 18px;
}

.capability-item {
  display: grid;
  grid-template-columns: 74px 1fr;
  gap: 24px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}

.capability-item:first-child {
  border-top: 1px solid var(--line);
}

.capability-item > span {
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  border-radius: 8px;
  background: #e6f4f1;
  color: var(--green);
  font-size: 12px;
  font-weight: 900;
}

.solutions {
  background: var(--dark);
  color: var(--white);
}

.solutions .eyebrow {
  color: #7ee0cc;
}

.solution-layout {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.18);
}

.solution-layout article {
  min-height: 250px;
  padding: 30px;
  background: #172633;
}

.solution-layout p {
  color: rgba(255, 255, 255, 0.7);
}

.quality {
  display: grid;
  grid-template-columns: minmax(300px, 0.9fr) minmax(320px, 1.1fr);
  gap: 52px;
  align-items: center;
  background: linear-gradient(90deg, #ffffff 0%, #ffffff 58%, #e8f3f0 58%, #e8f3f0 100%);
}

.quality-copy p:last-child {
  margin-top: 22px;
}

.quality-points {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.quality-points li {
  padding: 18px 20px;
  border-left: 4px solid var(--green);
  border-radius: 8px;
  background: var(--white);
  box-shadow: 0 16px 42px rgba(28, 44, 58, 0.08);
}

.contact {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(320px, 460px);
  gap: 48px;
  align-items: center;
  background: var(--white);
}

.contact p {
  margin-top: 20px;
  font-size: 17px;
}

.contact-box {
  padding: 30px;
  border-radius: 8px;
  background: var(--ink);
  color: var(--white);
  box-shadow: var(--shadow);
}

.contact-box p {
  display: grid;
  grid-template-columns: 76px 1fr;
  gap: 16px;
  margin: 0;
  padding: 16px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
  color: rgba(255, 255, 255, 0.76);
}

.contact-box strong {
  color: var(--white);
}

.contact-box a {
  display: inline-flex;
  align-items: center;
  min-height: 46px;
  margin-top: 22px;
  padding: 0 18px;
  border-radius: 8px;
  background: var(--gold);
  color: #111820;
  font-weight: 800;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 28px clamp(20px, 5vw, 72px);
  background: #111820;
  color: rgba(255, 255, 255, 0.72);
  font-size: 14px;
}

.site-footer a {
  color: var(--white);
}

@media (max-width: 980px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .nav {
    grid-column: 1 / -1;
    justify-content: space-between;
    gap: 12px;
    overflow-x: auto;
  }

  .hero,
  .intro,
  .split,
  .quality,
  .contact {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 70px;
  }

  .product-grid,
  .solution-layout {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .quality {
    background: var(--white);
  }
}

@media (max-width: 640px) {
  .site-header {
    padding: 14px 16px;
    gap: 14px;
  }

  .brand strong {
    font-size: 13px;
  }

  .brand small {
    display: none;
  }

  .nav {
    font-size: 13px;
  }

  .hero,
  .section {
    padding-left: 16px;
    padding-right: 16px;
  }

  .hero h1 {
    font-size: 38px;
  }

  .hero-copy {
    font-size: 16px;
  }

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

  .capability-item {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .contact-box {
    padding: 22px;
  }

  .contact-box p,
  .site-footer {
    grid-template-columns: 1fr;
  }

  .site-footer {
    flex-direction: column;
  }
}