:root {
  --ink: #14222d;
  --muted: #5c6b75;
  --line: #d8e0e5;
  --surface: #ffffff;
  --surface-muted: #f4f7f8;
  --brand: #155e75;
  --brand-dark: #0d4557;
  --accent: #e9b949;
  --radius: 14px;
  --shadow: 0 12px 30px rgba(20, 34, 45, .08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--surface); font: 16px/1.65 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif; }
a { color: inherit; text-decoration: none; }
img { display: block; width: 100%; height: 100%; object-fit: cover; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { line-height: 1.2; letter-spacing: -.02em; }
h1 { font-size: clamp(2.3rem, 6vw, 4.8rem); margin-bottom: 1.25rem; }
h2 { font-size: clamp(1.65rem, 3vw, 2.55rem); }
h3 { font-size: 1.2rem; }
.container { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.skip-link { position: absolute; left: -999px; top: 0; z-index: 20; background: var(--accent); padding: .65rem 1rem; }
.skip-link:focus { left: 1rem; top: 1rem; }
.sr-only { position: absolute; width: 1px; height: 1px; clip: rect(0, 0, 0, 0); overflow: hidden; white-space: nowrap; }
.site-header { position: sticky; top: 0; z-index: 10; border-bottom: 1px solid var(--line); background: rgba(255,255,255,.96); backdrop-filter: blur(10px); }
.nav-row { min-height: 70px; display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.brand { font-weight: 800; font-size: 1.45rem; letter-spacing: .04em; color: var(--brand-dark); }
.brand span { color: var(--accent); font-size: .65em; vertical-align: top; }
.site-navigation { display: flex; align-items: center; gap: 1.5rem; font-size: .94rem; }
.site-navigation a:hover, .site-navigation a:focus-visible { color: var(--brand); }
.language-link { border: 1px solid var(--line); border-radius: 99px; padding: .3rem .7rem; }
.menu-button { display: none; border: 0; background: transparent; padding: .35rem; }
.menu-button span:not(.sr-only) { display: block; width: 24px; height: 2px; margin: 4px; background: var(--ink); }
.hero { background: linear-gradient(132deg, #e6f1f4, #f6f7f4); padding: clamp(4rem, 8vw, 7rem) 0; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: clamp(2rem, 6vw, 7rem); }
.hero-copy, .page-intro p { max-width: 62ch; color: var(--muted); font-size: 1.06rem; }
.eyebrow { color: var(--brand); font-weight: 700; font-size: .78rem; letter-spacing: .13em; text-transform: uppercase; }
.hero-placeholder, .image-placeholder { min-height: 340px; display: grid; place-items: center; padding: 2rem; color: var(--muted); background: repeating-linear-gradient(45deg, #dce8ea, #dce8ea 12px, #e7eff0 12px, #e7eff0 24px); border: 1px solid #c3d4d8; border-radius: var(--radius); text-align: center; }
.button { display: inline-flex; align-items: center; justify-content: center; border-radius: 7px; padding: .72rem 1.1rem; font-weight: 700; transition: background .15s ease, color .15s ease, transform .15s ease; }
.button:hover { transform: translateY(-1px); }
.button-primary { color: #fff; background: var(--brand); }
.button-primary:hover { background: var(--brand-dark); }
.button-secondary { color: var(--brand-dark); border: 1px solid var(--brand); margin: .2rem .35rem .2rem 0; }
.section { padding: clamp(3.5rem, 7vw, 6rem) 0; }
.section-muted { background: var(--surface-muted); }
.section-heading { margin-bottom: 2rem; }
.section-heading-row { display: flex; justify-content: space-between; align-items: end; gap: 1.5rem; }
.section-heading h2 { margin-bottom: 0; }
.text-link { color: var(--brand); font-weight: 700; white-space: nowrap; }
.category-grid, .product-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.2rem; }
.category-card, .product-card { overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.category-card { padding: 1.4rem; min-height: 180px; transition: box-shadow .15s ease, transform .15s ease; }
.category-card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.category-card p { color: var(--muted); }
.category-card span { color: var(--brand); font-weight: 700; font-size: .9rem; }
.product-card { display: flex; flex-direction: column; }
.product-card-image { height: 210px; display: grid; place-items: center; color: var(--muted); background: #eaf0f1; }
.product-card-body { padding: 1.2rem; }
.product-card-body > p:first-child, .product-model { color: var(--muted); font-size: .82rem; }
.product-card-body h3 { margin-bottom: .3rem; }
.product-card-body h3 a:hover { color: var(--brand); }
.product-card-body > p:last-child { margin: .75rem 0 0; color: var(--muted); font-size: .92rem; }
.page-intro { padding: clamp(3.5rem, 7vw, 5.75rem) 0 2.5rem; background: var(--surface-muted); }
.catalogue-layout { display: grid; grid-template-columns: 220px 1fr; align-items: start; gap: 2rem; }
.category-filter { display: grid; gap: .35rem; position: sticky; top: 90px; }
.filter-link { border-left: 3px solid transparent; padding: .5rem .75rem; color: var(--muted); }
.filter-link:hover, .filter-link.is-active { border-color: var(--brand); color: var(--brand-dark); background: var(--surface-muted); font-weight: 700; }
.product-detail { padding-top: 2rem; }
.back-link { display: inline-block; margin-bottom: 1.75rem; color: var(--brand); font-weight: 700; }
.product-detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 6vw, 6rem); align-items: start; }
.product-media { min-height: 380px; overflow: hidden; border-radius: var(--radius); background: var(--surface-muted); }
.lead { color: var(--muted); font-size: 1.08rem; }
.download-panel { margin-top: 2rem; padding: 1.25rem; background: var(--surface-muted); border-radius: var(--radius); }
.download-panel h2 { margin-bottom: .75rem; font-size: 1.15rem; }
.product-description, .product-specifications { max-width: 780px; margin-top: 4rem; }
.product-specifications dl { margin: 0; border-top: 1px solid var(--line); }
.product-specifications dl div { display: grid; grid-template-columns: minmax(160px, .45fr) 1fr; gap: 1rem; padding: .85rem 0; border-bottom: 1px solid var(--line); }
.product-specifications dt { color: var(--muted); }
.product-specifications dd { margin: 0; }
.contact-placeholder { max-width: 780px; }
.contact-placeholder > div { padding: 2rem; border: 1px dashed #aebec5; border-radius: var(--radius); background: var(--surface-muted); }
.empty-state { color: var(--muted); }
.site-footer { border-top: 1px solid var(--line); color: var(--muted); font-size: .88rem; }
.footer-row { min-height: 88px; display: flex; justify-content: space-between; align-items: center; gap: 1rem; }

@media (max-width: 760px) {
  .menu-button { display: block; }
  .site-navigation { display: none; position: absolute; top: 70px; left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0; padding: .75rem 20px 1.25rem; border-bottom: 1px solid var(--line); background: #fff; }
  .site-navigation.is-open { display: flex; }
  .site-navigation a { padding: .65rem 0; }
  .language-link { width: max-content; margin-top: .4rem; }
  .hero-grid, .product-detail-grid, .catalogue-layout { grid-template-columns: 1fr; }
  .hero-placeholder { min-height: 240px; }
  .category-grid, .product-grid { grid-template-columns: 1fr; }
  .category-filter { position: static; display: flex; overflow-x: auto; padding-bottom: .5rem; }
  .filter-link { white-space: nowrap; }
  .section-heading-row, .footer-row { align-items: start; flex-direction: column; }
  .product-media { min-height: 270px; }
}