:root {
  --teal: #0e7c86;
  --teal-dark: #0a5c64;
  --teal-light: #e6f2f3;
  --teal-soft: #f3f9f9;
  --ink: #1f2a2e;
  --muted: #5b6b70;
  --bg: #ffffff;
  --bg-soft: #f6f9fa;
  --warm: #e8918c;
  --warm-soft: #fbeee9;
  --line: #e3eaec;
  --radius: 14px;
  --shadow: 0 6px 24px rgba(14, 124, 134, 0.08);
  --shadow-lg: 0 14px 40px rgba(14, 124, 134, 0.14);
  --maxw: 1140px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    "Hiragino Sans GB", "Noto Sans SC", "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--teal);
  text-decoration: none;
}
a:hover {
  color: var(--teal-dark);
}

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

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 66px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: var(--ink);
}
.brand .mark {
  width: 34px;
  height: 34px;
  flex: none;
}
.brand .name {
  font-size: 18px;
  letter-spacing: 0.5px;
}
.brand .name small {
  display: block;
  font-size: 11px;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 2px;
}
.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
  align-items: center;
}
.nav-links a {
  color: var(--ink);
  font-size: 15px;
  font-weight: 500;
  position: relative;
  padding: 4px 0;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--teal);
  transition: width 0.25s ease;
}
.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}
.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--ink);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  background: linear-gradient(
    120deg,
    var(--teal-soft) 0%,
    var(--teal-light) 60%,
    #ffffff 100%
  );
  overflow: hidden;
}
.hero .container {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 40px;
  align-items: center;
  padding: 70px 20px 80px;
}
.hero-text h1 {
  font-size: 40px;
  line-height: 1.25;
  margin-bottom: 18px;
  letter-spacing: 0.5px;
}
.hero-text h1 .accent {
  color: var(--teal);
}
.hero-text p.lead {
  font-size: 18px;
  color: var(--muted);
  margin-bottom: 28px;
  max-width: 520px;
}
.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 30px;
}
.hero-badges span {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 13px;
  color: var(--teal-dark);
  box-shadow: var(--shadow);
}
.hero-img {
  position: relative;
}
.hero-img img {
  border-radius: 22px;
  box-shadow: var(--shadow-lg);
  width: 100%;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}
.hero-cta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease;
  cursor: pointer;
  border: 1.5px solid transparent;
}
.btn-primary {
  background: var(--teal);
  color: #fff;
  box-shadow: var(--shadow);
}
.btn-primary:hover {
  background: var(--teal-dark);
  color: #fff;
  transform: translateY(-2px);
}
.btn-ghost {
  background: #fff;
  color: var(--teal-dark);
  border-color: var(--teal);
}
.btn-ghost:hover {
  background: var(--teal-soft);
  color: var(--teal-dark);
}

/* ---------- Sections ---------- */
section {
  padding: 64px 0;
}
.section-soft {
  background: var(--bg-soft);
}
.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 44px;
}
.section-head .eyebrow {
  display: inline-block;
  color: var(--teal);
  font-weight: 600;
  letter-spacing: 2px;
  font-size: 13px;
  margin-bottom: 10px;
}
.section-head h2 {
  font-size: 30px;
  margin-bottom: 12px;
}
.section-head p {
  color: var(--muted);
  font-size: 16px;
}

/* ---------- Stat strip ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.stat {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 20px;
  text-align: center;
  box-shadow: var(--shadow);
}
.stat .num {
  font-size: 30px;
  font-weight: 700;
  color: var(--teal);
}
.stat .label {
  color: var(--muted);
  font-size: 14px;
  margin-top: 4px;
}

/* ---------- Cards / advantages ---------- */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.card .ic {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: var(--teal-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  color: var(--teal);
}
.card h3 {
  font-size: 19px;
  margin-bottom: 8px;
}
.card p {
  color: var(--muted);
  font-size: 15px;
}

/* ---------- Product blocks ---------- */
.product-line {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 36px;
  align-items: center;
  margin-bottom: 56px;
}
.product-line.reverse .line-img {
  order: 2;
}
.line-img {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.line-img img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  border-radius: 12px;
}
.line-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--teal-dark);
  background: var(--teal-light);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 12px;
}
.line-warm .line-tag {
  color: #b5564f;
  background: var(--warm-soft);
}
.product-line h2 {
  font-size: 26px;
  margin-bottom: 10px;
}
.product-line .desc {
  color: var(--muted);
  margin-bottom: 18px;
}
.prod-list {
  list-style: none;
  display: grid;
  gap: 12px;
}
.prod-list li {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 16px;
  background: #fff;
}
.prod-list li b {
  display: block;
  font-size: 16px;
  margin-bottom: 2px;
}
.prod-list li span {
  color: var(--muted);
  font-size: 14px;
}

/* ---------- Product grid (products page) ---------- */
.prod-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.prod-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.prod-card .thumb {
  height: 210px;
  background: #f8fafb;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}
.prod-card.warm .thumb {
  background: #fff8f6;
}
.prod-card .thumb img {
  max-height: 92%;
  max-width: 92%;
  object-fit: contain;
  transition: transform 0.25s ease;
}
.prod-card:hover .thumb img {
  transform: scale(1.04);
}
.prod-card .body {
  padding: 22px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.prod-card .kicker {
  font-size: 12px;
  letter-spacing: 1px;
  color: var(--teal);
  font-weight: 600;
}
.prod-card.warm .kicker {
  color: #b5564f;
}
.prod-card h3 {
  font-size: 19px;
  margin: 6px 0 8px;
}
.prod-card p {
  color: var(--muted);
  font-size: 14.5px;
  flex: 1;
}
.prod-card .meta {
  margin-top: 14px;
  font-size: 13px;
  color: var(--teal-dark);
  border-top: 1px dashed var(--line);
  padding-top: 12px;
}

/* ---------- Platforms ---------- */
.platforms {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
}
.platform {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 22px;
  font-weight: 600;
  color: var(--ink);
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ---------- FAQ ---------- */
.faq-item {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-q {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 18px 20px;
  font-size: 16.5px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
}
.faq-q .plus {
  color: var(--teal);
  font-size: 22px;
  flex: none;
  transition: transform 0.2s ease;
}
.faq-item.open .faq-q .plus {
  transform: rotate(45deg);
}
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  padding: 0 20px;
  color: var(--muted);
  font-size: 15px;
}
.faq-item.open .faq-a {
  max-height: 320px;
  padding: 0 20px 18px;
}

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}
.contact-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}
.contact-card h3 {
  margin-bottom: 14px;
  font-size: 20px;
}
.contact-row {
  display: flex;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 15px;
}
.contact-row:last-child {
  border-bottom: none;
}
.contact-row .k {
  color: var(--teal-dark);
  font-weight: 600;
  min-width: 64px;
}
.contact-row .v {
  color: var(--ink);
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--teal-dark);
  color: #d7e8ea;
  padding: 48px 0 26px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 30px;
}
.site-footer h4 {
  color: #fff;
  font-size: 16px;
  margin-bottom: 14px;
}
.site-footer a {
  color: #cfe3e5;
}
.site-footer a:hover {
  color: #fff;
}
.site-footer ul {
  list-style: none;
  display: grid;
  gap: 8px;
  font-size: 14.5px;
}
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding-top: 18px;
  font-size: 13px;
  color: #a9c6c9;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  font-size: 13px;
  color: var(--muted);
  padding: 18px 0 0;
}
.breadcrumb a {
  color: var(--teal);
}

/* ---------- Misc ---------- */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}
.tag-list span {
  background: var(--teal-soft);
  color: var(--teal-dark);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 13px;
}
.notice {
  background: var(--teal-soft);
  border-left: 4px solid var(--teal);
  border-radius: 8px;
  padding: 14px 18px;
  font-size: 14.5px;
  color: var(--teal-dark);
  margin-top: 18px;
}
.timeline {
  list-style: none;
  border-left: 2px solid var(--line);
  margin-left: 8px;
  padding-left: 24px;
  display: grid;
  gap: 22px;
}
.timeline li {
  position: relative;
}
.timeline li::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--teal);
  border: 3px solid #fff;
  box-shadow: 0 0 0 2px var(--teal);
}
.timeline .yr {
  font-weight: 700;
  color: var(--teal);
}
.timeline b {
  display: block;
  margin: 2px 0;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero .container,
  .product-line,
  .grid-2,
  .grid-3,
  .contact-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .product-line.reverse .line-img {
    order: 0;
  }
  .stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-text h1 {
    font-size: 32px;
  }
  .nav-links {
    position: absolute;
    top: 66px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    gap: 0;
    border-bottom: 1px solid var(--line);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }
  .nav-links.show {
    max-height: 360px;
  }
  .nav-links li {
    width: 100%;
    border-top: 1px solid var(--line);
  }
  .nav-links a {
    display: block;
    padding: 14px 20px;
  }
  .nav-links a::after {
    display: none;
  }
  .nav-toggle {
    display: block;
  }
}
@media (max-width: 520px) {
  .stats {
    grid-template-columns: 1fr;
  }
  .hero-text h1 {
    font-size: 27px;
  }
}

/* ---------- Certificate gallery ---------- */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.cert-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  cursor: zoom-in;
}
.cert-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}
.cert-card img {
  width: 100%;
  height: 240px;
  object-fit: contain;
  background: #f8fafa;
  padding: 10px;
}
.cert-card p {
  padding: 12px 14px;
  margin: 0;
  font-size: 13.5px;
  color: var(--muted);
  border-top: 1px solid var(--line);
}
.cert-card p b {
  color: var(--ink);
  display: block;
  font-size: 14.5px;
  margin-bottom: 2px;
}
@media (max-width: 900px) {
  .cert-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 520px) {
  .cert-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- Literature / scientific evidence ---------- */
.cite-link {
  display: inline-block;
  margin-top: 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--teal);
}
.cite-link:hover {
  color: var(--teal-dark);
}
.cite-list {
  list-style: decimal;
  padding-left: 22px;
  display: grid;
  gap: 9px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}
.cite-list li {
  padding-left: 4px;
}
.patent-box {
  background: var(--teal-soft);
  border: 1px solid var(--line);
  border-left: 4px solid var(--teal);
  border-radius: 10px;
  padding: 14px 18px;
  font-size: 13.5px;
  color: var(--teal-dark);
}
.patent-box b {
  display: block;
  margin-bottom: 6px;
  font-size: 14.5px;
}
.patent-list {
  list-style: disc;
  padding-left: 20px;
  display: grid;
  gap: 5px;
}
.cite-note {
  max-width: 1000px;
  margin: 22px auto 0;
  font-size: 12.5px;
  color: var(--muted);
  text-align: center;
  line-height: 1.7;
}