:root {
  --bg: #f7faf8;
  --surface: #ffffff;
  --surface-soft: #eaf4f1;
  --text: #16201d;
  --muted: #5e6e68;
  --brand: #0f766e;
  --brand-dark: #115e59;
  --accent: #d97706;
  --line: #dce7e3;
  --shadow: 0 20px 60px rgba(21, 49, 45, 0.12);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}

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

img {
  display: block;
  max-width: 100%;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(18px, 4vw, 56px);
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 230px;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  color: #fff;
  background: var(--brand);
  border-radius: 8px;
  font-size: 24px;
  font-weight: 800;
}

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

.brand strong {
  font-size: 17px;
  line-height: 1.2;
}

.brand small {
  max-width: 260px;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.3;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 700;
}

.site-nav a {
  padding: 9px 12px;
  border-radius: 8px;
}

.site-nav a:hover {
  color: var(--brand-dark);
  background: var(--surface-soft);
}

.nav-cta {
  color: #fff !important;
  background: var(--brand);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.nav-toggle span {
  display: block;
  height: 2px;
  margin: 5px 0;
  background: var(--text);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 520px);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
  min-height: calc(100vh - 74px);
  padding: clamp(40px, 7vw, 92px) clamp(18px, 5vw, 72px);
  background:
    linear-gradient(110deg, rgba(247, 250, 248, 0.98), rgba(234, 244, 241, 0.78)),
    url("/assets/images/products/product-12.png") center / cover no-repeat;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 900px;
  margin-bottom: 18px;
  font-size: clamp(38px, 6vw, 74px);
  line-height: 1.05;
  letter-spacing: 0;
}

h2 {
  font-size: clamp(28px, 3.5vw, 44px);
  line-height: 1.18;
}

h3 {
  font-size: 19px;
  line-height: 1.35;
}

.hero-lead {
  max-width: 760px;
  color: #31413c;
  font-size: clamp(17px, 2vw, 22px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0;
}

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border: 1px solid var(--brand);
  border-radius: 8px;
  font-weight: 800;
}

.button.primary {
  color: #fff;
  background: var(--brand);
}

.button.secondary {
  color: var(--brand-dark);
  background: rgba(255, 255, 255, 0.72);
}

.hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  max-width: 900px;
  margin: 0;
}

.hero-facts div {
  padding: 14px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.hero-facts dt {
  color: var(--muted);
  font-size: 13px;
}

.hero-facts dd {
  margin: 2px 0 0;
  font-weight: 800;
}

.hero-media {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.hero-media img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  padding: 16px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.hero-media img:first-child {
  grid-column: span 2;
  aspect-ratio: 16 / 9;
}

.section {
  padding: clamp(54px, 8vw, 96px) clamp(18px, 5vw, 72px);
}

.section-heading {
  max-width: 860px;
  margin-bottom: 28px;
}

.section-heading p {
  color: var(--muted);
}

.intro-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
  color: #33423d;
  font-size: 18px;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.product-card {
  min-height: 100%;
  padding: 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.product-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: contain;
  margin-bottom: 16px;
  padding: 10px;
  background: #fbfdfc;
  border-radius: 8px;
}

.product-card p,
.application-grid p,
.faq p {
  color: var(--muted);
}

.product-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.product-tags span {
  padding: 7px 11px;
  color: var(--brand-dark);
  background: var(--surface-soft);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
}

.band {
  background: #10231f;
  color: #fff;
}

.band .section-heading p,
.band .eyebrow {
  color: #fbbf24;
}

.application-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.application-grid article {
  min-height: 164px;
  padding: 22px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 8px;
}

.certificate-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}

.certificate-list a {
  display: flex;
  min-height: 92px;
  align-items: center;
  justify-content: center;
  padding: 16px;
  color: var(--brand-dark);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  font-weight: 800;
  text-align: center;
}

.certificate-list a:hover {
  border-color: var(--brand);
  box-shadow: var(--shadow);
}

.company {
  background: #edf5f2;
}

.company-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
}

.company-list div {
  padding: 16px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.company-list dt {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.company-list dd {
  margin: 6px 0 0;
  font-weight: 700;
}

.faq-list {
  display: grid;
  gap: 12px;
  max-width: 980px;
}

details {
  padding: 18px 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

summary {
  cursor: pointer;
  font-size: 18px;
  font-weight: 800;
}

details p {
  margin: 12px 0 0;
}

.contact {
  background: #fff;
}

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

.contact-card {
  padding: 24px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.contact-card ul {
  margin: 0;
  padding-left: 20px;
}

address {
  display: grid;
  gap: 10px;
  font-style: normal;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
  padding: 22px clamp(18px, 5vw, 72px);
  color: #dce7e3;
  background: #10231f;
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  color: #fff;
  text-decoration: underline;
}

@media (max-width: 980px) {
  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 70px;
    right: 18px;
    display: none;
    width: min(320px, calc(100vw - 36px));
    flex-direction: column;
    align-items: stretch;
    padding: 12px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: var(--shadow);
  }

  .site-nav.is-open {
    display: flex;
  }

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

  .hero {
    min-height: auto;
  }

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

  .certificate-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .site-header {
    padding: 12px 16px;
  }

  .brand small {
    display: none;
  }

  .hero {
    padding-top: 42px;
  }

  .hero-facts,
  .product-grid,
  .application-grid,
  .company-list,
  .certificate-list {
    grid-template-columns: 1fr;
  }

  .hero-media {
    grid-template-columns: 1fr;
  }

  .hero-media img:first-child {
    grid-column: auto;
  }
}