:root {
  color-scheme: light;
  --blue: #0b5da8;
  --blue-dark: #073e71;
  --cta: #a85f10;
  --cta-dark: #8f4f0b;
  --ink: #102033;
  --muted: #546273;
  --line: #d9e2ec;
  --soft: #f4f7fb;
  --white: #fff;
  --steel: #243447;
  --accent: #f0b429;
  --shadow: 0 18px 48px rgba(16, 32, 51, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Arial, "Noto Sans SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.55;
}
a { color: inherit; }
img { display: block; max-width: 100%; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: 76px;
  padding: 12px clamp(18px, 4vw, 56px);
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}
.brand img { width: 148px; height: auto; }
.nav {
  display: flex;
  align-items: center;
  gap: 22px;
  margin-left: auto;
  font-size: 15px;
  font-weight: 700;
}
.nav a { text-decoration: none; color: var(--steel); }
.nav a:hover { color: var(--blue); }
.lang-toggle {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: var(--soft);
}
.lang-toggle button {
  border: 0;
  padding: 8px 10px;
  background: transparent;
  color: var(--muted);
  font-weight: 700;
  cursor: pointer;
}
.lang-toggle button.active {
  background: var(--blue);
  color: var(--white);
}

.hero {
  min-height: calc(100vh - 76px);
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.75fr);
  align-items: center;
  gap: clamp(28px, 6vw, 76px);
  padding: clamp(44px, 7vw, 92px) clamp(18px, 5vw, 72px);
  background:
    linear-gradient(90deg, rgba(6, 30, 55, 0.92), rgba(6, 30, 55, 0.78) 45%, rgba(6, 30, 55, 0.2)),
    url("assets/hero-banner.jpg") center / cover;
  color: var(--white);
}
.hero h1 {
  max-width: 820px;
  margin: 0;
  font-size: clamp(38px, 6vw, 76px);
  line-height: 1.02;
  letter-spacing: 0;
}
.hero p { max-width: 660px; color: rgba(255,255,255,0.88); font-size: 18px; }
.hero .hero-badge {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  margin: 0 0 18px;
  padding: 8px 12px;
  border-radius: 8px;
  background: rgba(255,255,255,0.92);
  color: var(--blue-dark);
  font-size: 14px;
  font-weight: 900;
  text-transform: uppercase;
}
.eyebrow {
  margin: 0 0 12px;
  color: var(--blue);
  font-size: 14px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0;
}
.hero .eyebrow { color: #b8dcff; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 8px;
  border: 1px solid transparent;
  text-decoration: none;
  font-weight: 800;
  font-size: 15px;
  cursor: pointer;
}
.button.primary { background: var(--cta); color: var(--white); }
.button.primary:hover,
.button.primary:focus-visible { background: var(--cta-dark); }
.button.ghost { border-color: rgba(255,255,255,0.55); color: var(--white); }
.hero-panel {
  align-self: end;
  background: rgba(255,255,255,0.95);
  color: var(--ink);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.hero-panel img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.hero-panel div { padding: 18px; }
.hero-panel span { color: var(--blue); font-weight: 800; font-size: 14px; text-transform: uppercase; }
.hero-panel strong { display: block; margin-top: 6px; font-size: 19px; line-height: 1.3; }

.section {
  padding: clamp(48px, 8vw, 96px) clamp(18px, 5vw, 72px);
}
.split {
  display: grid;
  grid-template-columns: minmax(240px, 0.7fr) minmax(0, 1fr);
  gap: clamp(24px, 6vw, 80px);
  border-bottom: 1px solid var(--line);
}
h2 {
  margin: 0;
  font-size: clamp(31px, 4.2vw, 54px);
  line-height: 1.05;
}
.prose p, .products-intro p { color: var(--muted); font-size: 17px; }

.industry-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
}
.industry-strip article {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 116px;
  padding: 20px clamp(14px, 3vw, 34px);
  background: var(--soft);
  font-weight: 800;
}
.industry-strip img { width: 58px; height: 58px; object-fit: contain; }

.products-intro {
  max-width: 1080px;
  padding-bottom: 22px;
}
.filter-section {
  position: sticky;
  top: 76px;
  z-index: 10;
  padding: 0 clamp(18px, 5vw, 72px) 22px;
  background: rgba(255,255,255,0.94);
  backdrop-filter: blur(12px);
}
.filter-panel {
  max-width: 1080px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft);
}
.filter-panel p {
  margin: 0 0 10px;
  color: var(--blue-dark);
  font-size: 14px;
  font-weight: 900;
  text-transform: uppercase;
}
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-start;
}
.filter-bar button {
  border: 1px solid var(--line);
  background: var(--white);
  border-radius: 8px;
  padding: 10px 12px;
  font-weight: 800;
  color: var(--steel);
  cursor: pointer;
}
.filter-bar button.active {
  color: var(--white);
  background: var(--blue);
  border-color: var(--blue);
}

.brand-section {
  padding: 32px clamp(18px, 5vw, 72px) 56px;
  border-top: 1px solid var(--line);
}
.brand-copy {
  display: block;
  max-width: 1040px;
  margin-bottom: 24px;
}
.brand-kicker {
  display: inline-flex;
  width: fit-content;
  border-left: 4px solid var(--accent);
  padding-left: 10px;
  color: var(--blue-dark);
  font-weight: 900;
  margin-bottom: 10px;
}
h3 { margin: 0 0 14px; font-size: 34px; line-height: 1.12; }
.brand-copy p {
  max-width: 1040px;
  margin: 0;
  color: var(--muted);
  font-size: 17px;
}
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}
.product-grid.compact {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
.green-solutions {
  display: grid;
  max-width: 1080px;
  grid-template-columns: 1fr;
  gap: 10px;
  align-items: stretch;
}
.product-card {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: var(--white);
  box-shadow: 0 10px 30px rgba(16,32,51,0.06);
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
  cursor: pointer;
}
.product-card:hover,
.product-card:focus,
.product-card:focus-within {
  transform: translateY(-4px);
  border-color: rgba(11, 93, 168, 0.36);
  box-shadow: 0 18px 42px rgba(16,32,51,0.14);
  outline: 2px solid rgba(11, 93, 168, 0.24);
  outline-offset: 3px;
}
.product-card[hidden] { display: none; }
.product-card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background: var(--soft);
  transition: transform 220ms ease, filter 220ms ease;
}
.product-card:hover img,
.product-card:focus img,
.product-card:focus-within img {
  transform: scale(1.035);
  filter: saturate(1.08);
}
.product-card h4 {
  margin: 0;
  padding: 16px 16px 8px;
  font-size: 18px;
  color: var(--blue-dark);
}
.product-card p {
  margin: 0;
  padding: 0 16px 18px;
  color: var(--muted);
  font-size: 15px;
}
.product-card::after {
  content: attr(data-card-label);
  display: inline-flex;
  margin: 0 16px 18px;
  color: var(--blue);
  font-size: 14px;
  font-weight: 900;
}
.product-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-top: 3px solid transparent;
  pointer-events: none;
  transition: border-color 180ms ease;
}
.product-card:hover::before,
.product-card:focus::before,
.product-card:focus-within::before {
  border-color: var(--blue);
}
.solution-card {
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 118px;
  gap: 18px;
  padding: 18px 18px 18px 20px;
  border-left: 4px solid #28633c;
  box-shadow: none;
  background: linear-gradient(90deg, #fbfdfb, var(--white));
}
.solution-card img {
  aspect-ratio: 1 / 1;
  height: 92px;
  max-height: 92px;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: 6px;
  opacity: 0.58;
  filter: grayscale(0.18);
}
.solution-card:hover img,
.solution-card:focus img,
.solution-card:focus-within img {
  transform: scale(1.01);
  filter: grayscale(0) contrast(1.04);
  opacity: 0.82;
}
.solution-content {
  min-width: 0;
}
.solution-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: #e9f3eb;
  color: #28633c;
  font-size: 13px;
  font-weight: 900;
  margin: 0 10px 0 0;
  vertical-align: middle;
}
.solution-card h4 {
  display: inline;
  padding: 0;
  font-size: 20px;
}
.solution-card p {
  max-width: 760px;
  padding: 10px 0 0;
}
.solution-card::after {
  margin: 12px 0 0;
  align-self: auto;
}
.solution-reference {
  margin: 0;
  align-self: center;
}
.solution-reference figcaption {
  margin-top: 6px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.brand-empty {
  margin: 16px 0 0;
  padding: 18px 20px;
  border: 1px dashed rgba(11, 93, 168, 0.34);
  border-radius: 8px;
  background: #f7fbff;
  color: var(--muted);
  font-size: 15px;
  font-weight: 800;
}

@media (prefers-reduced-motion: reduce) {
  .product-card,
  .product-card img,
  .product-card:hover,
  .product-card:focus,
  .product-card:focus-within,
  .product-card:hover img,
  .product-card:focus img,
  .product-card:focus-within img {
    transform: none;
  }
}

.drawer-backdrop {
  position: fixed;
  inset: 0;
  z-index: 30;
  background: rgba(8, 20, 34, 0.48);
}
.product-drawer {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 31;
  width: min(520px, 100vw);
  height: 100vh;
  overflow: auto;
  background: var(--white);
  box-shadow: -18px 0 60px rgba(16, 32, 51, 0.24);
}
.drawer-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 42px;
  height: 42px;
  border: 0;
  border-radius: 8px;
  background: rgba(255,255,255,0.94);
  color: var(--ink);
  font-size: 28px;
  cursor: pointer;
}
.drawer-image-button {
  width: 100%;
  padding: 0;
  border: 0;
  background: var(--soft);
  cursor: zoom-in;
}
.drawer-image-button img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background: var(--soft);
}
.drawer-body {
  display: grid;
  gap: 16px;
  padding: 28px;
}
.drawer-body h2 { font-size: clamp(28px, 4vw, 42px); }
.drawer-body p:not(.eyebrow) {
  margin: 0;
  color: var(--muted);
}
.image-lightbox {
  position: fixed;
  inset: 0;
  z-index: 42;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(8, 20, 34, 0.82);
}
.image-lightbox[hidden] { display: none; }
.image-lightbox img {
  max-width: min(1100px, 94vw);
  max-height: 88vh;
  object-fit: contain;
  border-radius: 8px;
  background: var(--white);
}
.lightbox-close {
  position: fixed;
  top: 14px;
  right: 14px;
  width: 44px;
  height: 44px;
  border: 0;
  border-radius: 8px;
  background: var(--white);
  color: var(--ink);
  font-size: 30px;
  cursor: pointer;
}

.contact-section {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(320px, 0.75fr);
  gap: clamp(28px, 6vw, 72px);
  padding: clamp(48px, 8vw, 96px) clamp(18px, 5vw, 72px);
  background: var(--steel);
  color: var(--white);
}
.contact-copy .eyebrow { color: #9bcfff; }
.contact-copy p, .contact-list { color: rgba(255,255,255,0.82); }
.contact-list {
  display: grid;
  gap: 18px;
  margin: 32px 0 0;
}
.contact-list div { border-top: 1px solid rgba(255,255,255,0.18); padding-top: 18px; }
.contact-list dt { font-weight: 900; color: var(--white); margin-bottom: 6px; }
.contact-list dd { margin: 0 0 4px; }
.contact-form {
  display: grid;
  gap: 14px;
  padding: 22px;
  background: var(--white);
  color: var(--ink);
  border-radius: 8px;
}
.contact-form label { display: grid; gap: 7px; font-weight: 800; }
.contact-form input, .contact-form textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  font: inherit;
}
.contact-form textarea { resize: vertical; }
.hidden-field { position: absolute; left: -9999px; }
.form-note { margin: 0; color: var(--muted); font-size: 14px; }

.footer {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 24px clamp(18px, 5vw, 72px);
  border-top: 1px solid var(--line);
  color: var(--muted);
}
.footer img { width: 120px; }
.footer p { margin: 0; font-weight: 900; color: var(--steel); }
.footer span { margin-left: auto; white-space: nowrap; font-size: 13px; color: var(--muted); }

@media (max-width: 980px) {
  .site-header { flex-wrap: wrap; gap: 14px; }
  .nav { order: 3; width: 100%; justify-content: space-between; margin-left: 0; }
  .hero, .split, .brand-copy, .contact-section { grid-template-columns: 1fr; }
  .hero { min-height: auto; }
  .filter-section { position: static; }
  .industry-strip, .product-grid, .product-grid.compact { grid-template-columns: repeat(2, 1fr); }
  .green-solutions { grid-template-columns: 1fr; }
  .solution-card { grid-template-columns: minmax(0, 1fr) 96px; }
  .solution-card img { width: 100%; height: 78px; max-height: 78px; }
  .filter-bar { justify-content: flex-start; }
}

@media (max-width: 820px) {
  .site-header {
    position: sticky;
    top: 0;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 10px 12px;
    min-height: 0;
    padding: 12px 20px 10px;
  }
  .brand {
    grid-column: 1 / -1;
    align-self: center;
  }
  .brand img { width: 124px; }
  .lang-toggle {
    grid-column: 2;
    grid-row: 2;
    justify-self: end;
    align-self: center;
  }
  .lang-toggle button {
    padding: 8px 9px;
    font-size: 14px;
  }
  .nav {
    grid-column: 1;
    grid-row: 2;
    order: 0;
    width: 100%;
    margin: 0;
    overflow-x: auto;
    justify-content: flex-start;
    gap: 18px;
    padding-top: 0;
    font-size: 14px;
  }
  .nav a {
    flex: 0 0 auto;
    min-height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    border: 0;
    border-bottom: 2px solid transparent;
    border-radius: 0;
    background: transparent;
    color: var(--blue-dark);
    font-weight: 900;
    white-space: nowrap;
  }
  .nav a:hover,
  .nav a:focus-visible {
    border-bottom-color: var(--accent);
    color: var(--blue);
  }
  .hero {
    min-height: auto;
    display: block;
    padding: 34px 20px 40px;
    background:
      linear-gradient(90deg, rgba(6, 30, 55, 0.88), rgba(6, 30, 55, 0.66)),
      url("assets/hero-banner.jpg") center / cover;
  }
  .hero h1 {
    max-width: 340px;
    font-size: 36px;
    line-height: 1.08;
  }
  .hero p {
    max-width: 340px;
    font-size: 16px;
    line-height: 1.55;
  }
  .hero .hero-badge {
    margin-bottom: 14px;
    padding: 0 0 0 10px;
    border-left: 4px solid var(--accent);
    border-radius: 0;
    background: transparent;
    color: rgba(255,255,255,0.88);
    font-size: 12px;
    line-height: 1.35;
  }
  .hero-actions {
    display: grid;
    grid-template-columns: 1fr;
    width: 100%;
    gap: 10px;
    margin-top: 24px;
  }
  .hero-actions .button {
    width: 100%;
    min-height: 48px;
    padding-inline: 20px;
  }
  .hero-panel { display: none; }
  h2 { font-size: 31px; line-height: 1.12; }
  h3 { font-size: 28px; }
  .section,
  .brand-section,
  .contact-section {
    padding-left: 20px;
    padding-right: 20px;
  }
  .industry-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
    padding: 20px;
    background: var(--white);
  }
  .industry-strip article {
    min-height: 112px;
    display: grid;
    justify-items: start;
    align-content: center;
    gap: 8px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--soft);
    font-size: 14px;
    line-height: 1.25;
  }
  .industry-strip img {
    width: 42px;
    height: 42px;
  }
  .product-grid, .product-grid.compact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }
  .green-solutions { grid-template-columns: 1fr; }
  .product-card h4 {
    padding: 12px 12px 6px;
    font-size: 16px;
    line-height: 1.22;
  }
  .product-card p {
    padding: 0 12px 12px;
    font-size: 14px;
    line-height: 1.45;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }
  .product-card::after {
    margin: 0 12px 14px;
    font-size: 13px;
  }
  .solution-card {
    min-height: auto;
    grid-template-columns: 1fr;
    padding: 16px;
  }
  .solution-reference { display: none; }
  .solution-card h4 { padding: 0 0 6px; }
  .solution-card p { padding: 0; }
  .solution-card::after { margin: 4px 0 0; }
  .footer { align-items: flex-start; flex-direction: column; }
  .footer p {
    max-width: 100%;
    white-space: nowrap;
    font-size: clamp(12px, 3.35vw, 15px);
    line-height: 1.2;
  }
  .footer span {
    margin-left: 0;
    font-size: 11px;
    opacity: 0.78;
  }
}