:root {
  --ink: #14201c;
  --muted: #5d6f68;
  --leaf: #1f6b4f;
  --leaf-dark: #124233;
  --rain: #d8e8e5;
  --mist: #f3f7f5;
  --sky: #6ba4b8;
  --sun: #f4c95d;
  --white: #ffffff;
  --line: rgba(20, 32, 28, 0.13);
  --shadow: 0 22px 70px rgba(22, 50, 40, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--mist);
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.65;
}

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

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(18px, 4vw, 56px);
  color: var(--white);
  background: linear-gradient(180deg, rgba(8, 24, 19, 0.82), rgba(8, 24, 19, 0.18));
  transition: background 180ms ease, box-shadow 180ms ease;
}

.site-header.is-scrolled {
  background: rgba(14, 46, 36, 0.94);
  box-shadow: 0 12px 34px rgba(5, 22, 17, 0.22);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  flex: 0 0 auto;
  border: 1px solid rgba(255, 255, 255, 0.58);
  background: rgba(255, 255, 255, 0.16);
  font-weight: 800;
  border-radius: 8px;
}

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

.brand strong {
  font-size: 16px;
  line-height: 1.15;
}

.brand small {
  margin-top: 2px;
  font-size: 11px;
  letter-spacing: 0.7px;
  opacity: 0.82;
}

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

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

.site-nav a:hover {
  background: rgba(255, 255, 255, 0.16);
}

.language-switch {
  display: inline-flex;
  gap: 3px;
  padding-left: 8px;
  margin-left: 4px;
  border-left: 1px solid rgba(255, 255, 255, 0.28);
}

.language-switch a {
  padding: 6px 8px;
  font-size: 12px;
  font-weight: 900;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.12);
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: var(--white);
}

.hero {
  position: relative;
  min-height: 92vh;
  display: grid;
  align-items: center;
  overflow: hidden;
  background: #183428;
}

.hero picture,
.hero img,
.hero-shade {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero img {
  object-fit: cover;
  object-position: center;
}

.hero-shade {
  background:
    linear-gradient(90deg, rgba(6, 22, 17, 0.88) 0%, rgba(6, 22, 17, 0.62) 31%, rgba(6, 22, 17, 0.12) 64%),
    linear-gradient(0deg, rgba(13, 35, 28, 0.48), rgba(13, 35, 28, 0.06));
}

.hero-content {
  position: relative;
  z-index: 2;
  width: min(760px, calc(100% - 36px));
  margin-left: clamp(18px, 7vw, 92px);
  padding-top: 72px;
  color: var(--white);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--sun);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 1.8px;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 8px;
  max-width: 720px;
  font-size: clamp(40px, 7vw, 82px);
  line-height: 1.05;
  letter-spacing: 0;
}

.hero-en {
  margin-bottom: 22px;
  color: rgba(255, 255, 255, 0.82);
  font-size: clamp(14px, 1.8vw, 20px);
  letter-spacing: 1px;
}

.hero-copy {
  max-width: 650px;
  margin-bottom: 30px;
  color: rgba(255, 255, 255, 0.9);
  font-size: clamp(16px, 2vw, 20px);
}

.hero-actions,
.material-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-weight: 800;
  line-height: 1.2;
}

.btn.primary {
  color: #10231c;
  background: var(--sun);
}

.btn.ghost {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.58);
  background: rgba(255, 255, 255, 0.08);
}

.stats {
  position: relative;
  z-index: 3;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  width: min(1120px, calc(100% - 36px));
  margin: -58px auto 0;
  overflow: hidden;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.62);
  box-shadow: var(--shadow);
}

.stats div {
  padding: 24px;
  background: rgba(255, 255, 255, 0.92);
}

.stats strong {
  display: block;
  color: var(--leaf);
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1.1;
}

.stats span {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 14px;
}

.section {
  width: min(1120px, calc(100% - 36px));
  margin: 0 auto;
  padding: 96px 0;
}

.about {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.65fr);
  gap: 40px;
  align-items: start;
}

.section-text h2,
.section-heading h2,
.materials-content h2,
.contact h2 {
  margin-bottom: 18px;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.16;
  letter-spacing: 0;
}

.section-text p,
.section-heading p,
.materials-content p,
.contact p {
  color: var(--muted);
  font-size: 16px;
}

.about-panel {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: 0 18px 44px rgba(18, 66, 51, 0.08);
}

.about-panel h3 {
  margin-bottom: 12px;
}

.about-panel ul {
  padding: 0;
  margin: 0;
  list-style: none;
}

.about-panel li {
  padding: 12px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.section-heading {
  max-width: 740px;
  margin-bottom: 34px;
}

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

.category-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.product-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: 0 18px 44px rgba(18, 66, 51, 0.08);
}

.product-card img {
  width: 100%;
  height: 265px;
  object-fit: cover;
}

.product-card > div {
  padding: 22px;
}

.product-card span {
  display: block;
  margin-bottom: 8px;
  color: var(--leaf);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.product-card h3,
.market-grid h3 {
  margin-bottom: 8px;
  font-size: 22px;
}

.product-card p,
.market-grid p {
  margin-bottom: 0;
  color: var(--muted);
}

.text-link {
  display: inline-flex;
  margin-top: 16px;
  color: var(--leaf);
  font-weight: 900;
}

.text-link:hover {
  color: var(--leaf-dark);
}

.materials-band {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(320px, 0.88fr);
  gap: 0;
  background: var(--leaf-dark);
  color: var(--white);
}

.materials-band img {
  width: 100%;
  height: 100%;
  min-height: 520px;
  object-fit: cover;
}

.materials-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(36px, 6vw, 78px);
}

.materials-content p {
  color: rgba(255, 255, 255, 0.78);
}

.material-tags span {
  padding: 8px 12px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 8px;
  color: rgba(255, 255, 255, 0.88);
  background: rgba(255, 255, 255, 0.08);
  font-weight: 700;
}

.material-guide {
  padding-top: 86px;
}

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

.material-grid article {
  min-height: 235px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(145deg, rgba(216, 232, 229, 0.72), rgba(255, 255, 255, 0) 46%),
    var(--white);
}

.material-grid h3 {
  margin-bottom: 10px;
  color: var(--leaf-dark);
  font-size: 22px;
}

.material-grid p {
  margin-bottom: 0;
  color: var(--muted);
}

.page-hero {
  position: relative;
  min-height: 58vh;
  display: grid;
  align-items: end;
  overflow: hidden;
  background: var(--leaf-dark);
}

.page-hero img,
.page-hero-shade {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.page-hero img {
  object-fit: cover;
  object-position: center 34%;
}

.page-hero-shade {
  background:
    linear-gradient(90deg, rgba(6, 22, 17, 0.82), rgba(6, 22, 17, 0.28) 62%),
    linear-gradient(0deg, rgba(6, 22, 17, 0.74), rgba(6, 22, 17, 0.08) 58%);
}

.page-hero-content {
  position: relative;
  z-index: 2;
  width: min(900px, calc(100% - 36px));
  margin: 0 auto;
  padding: 150px 0 62px;
  color: var(--white);
}

.page-hero-content h1 {
  margin-bottom: 12px;
  font-size: clamp(42px, 7vw, 76px);
}

.page-hero-content p:not(.eyebrow) {
  max-width: 680px;
  color: rgba(255, 255, 255, 0.84);
  font-size: clamp(16px, 2vw, 20px);
}

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 360px);
  gap: 34px;
  align-items: start;
}

.page-main,
.page-side,
.spec-placeholder {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: 0 18px 44px rgba(18, 66, 51, 0.08);
}

.page-main {
  padding: clamp(26px, 4vw, 42px);
}

.page-main h2 {
  margin-bottom: 16px;
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1.18;
}

.page-main p {
  color: var(--muted);
}

.spec-placeholder {
  margin-top: 28px;
  padding: 24px;
  background: var(--mist);
  box-shadow: none;
}

.spec-placeholder h3 {
  margin-bottom: 16px;
}

.placeholder-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.placeholder-grid span {
  display: block;
  min-height: 48px;
  padding: 12px;
  border: 1px dashed rgba(31, 107, 79, 0.28);
  border-radius: 8px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.7);
  font-size: 14px;
}

.page-side {
  position: sticky;
  top: 96px;
  padding: 26px;
}

.page-side ul {
  padding: 0;
  margin: 0 0 24px;
  list-style: none;
}

.page-side li {
  padding: 12px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.markets {
  padding-bottom: 72px;
}

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

.market-grid article,
.steps div {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.market-grid article {
  min-height: 190px;
  background:
    linear-gradient(140deg, rgba(107, 164, 184, 0.18), rgba(255, 255, 255, 0) 42%),
    var(--white);
}

.process {
  padding-top: 0;
}

.steps {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.steps div {
  min-height: 150px;
}

.steps strong,
.steps span {
  display: block;
}

.steps strong {
  margin-bottom: 10px;
  color: var(--leaf);
  font-size: 18px;
}

.steps span {
  color: var(--muted);
  font-size: 14px;
}

.contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 440px);
  gap: 36px;
  align-items: center;
  padding: 72px clamp(18px, 5vw, 72px);
  color: var(--white);
  background:
    linear-gradient(120deg, rgba(18, 66, 51, 0.96), rgba(31, 107, 79, 0.86)),
    var(--leaf-dark);
}

.contact .eyebrow {
  color: var(--sun);
}

.contact p {
  color: rgba(255, 255, 255, 0.78);
}

.contact-box {
  padding: 26px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
}

.contact-box p {
  display: grid;
  gap: 4px;
  margin-bottom: 18px;
}

.contact-box strong,
.contact-list strong {
  color: var(--sun);
  font-size: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

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

.contact-list {
  display: grid;
  gap: 5px;
  padding: 15px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}

.contact-list a {
  color: var(--white);
  overflow-wrap: anywhere;
}

.contact-list a:hover {
  color: var(--sun);
}

.contact-box .btn {
  margin-top: 18px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 24px clamp(18px, 4vw, 56px);
  color: rgba(255, 255, 255, 0.78);
  background: #0d211a;
  font-size: 14px;
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  color: var(--sun);
  font-weight: 800;
}

@media (max-width: 900px) {
  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 72px;
    left: 18px;
    right: 18px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 10px;
    border-radius: 8px;
    background: rgba(14, 46, 36, 0.98);
    box-shadow: var(--shadow);
  }

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

  .site-nav a {
    padding: 12px;
  }

  .language-switch {
    border-left: 0;
    border-top: 1px solid rgba(255, 255, 255, 0.22);
    margin-left: 0;
    padding: 8px 0 0;
  }

  .stats,
  .about,
  .materials-band,
  .contact {
    grid-template-columns: 1fr;
  }

  .stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .product-grid,
  .category-grid,
  .material-grid,
  .market-grid,
  .steps,
  .page-layout {
    grid-template-columns: 1fr;
  }

  .page-side {
    position: static;
  }

  .materials-band img {
    min-height: 360px;
  }
}

@media (max-width: 620px) {
  .site-header {
    padding: 12px 14px;
  }

  .brand strong {
    max-width: 210px;
    font-size: 14px;
  }

  .brand small {
    display: none;
  }

  .hero {
    min-height: 86vh;
  }

  .hero img {
    object-position: 60% center;
  }

  .hero-shade {
    background:
      linear-gradient(90deg, rgba(6, 22, 17, 0.9), rgba(6, 22, 17, 0.45)),
      linear-gradient(0deg, rgba(13, 35, 28, 0.5), rgba(13, 35, 28, 0.08));
  }

  .hero-content {
    width: min(100% - 28px, 560px);
    margin-left: 14px;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .stats {
    grid-template-columns: 1fr;
    margin-top: 0;
    width: 100%;
    border-radius: 0;
  }

  .section {
    width: min(100% - 28px, 1120px);
    padding: 66px 0;
  }

  .product-card img {
    height: 220px;
  }

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

  .contact {
    padding: 56px 18px;
  }

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