/* ============================================================
   KLQD · Ningbo Kailing Pneumatic — Fable source UI
   Design language: industrial editorial.
   Ink blue-black / warm paper / signal orange (taken from the
   orange of Kailing's own rack-and-pinion actuators).
   ============================================================ */

:root {
  --ink: #11151c;
  --ink-2: #1a2230;
  --ink-3: #232d3f;
  --paper: #f5f3ee;
  --white: #ffffff;
  --signal: #f05a19;
  --signal-deep: #d44a0e;
  --steel: #5e6a79;
  --steel-light: #94a0af;
  --line: #e2ddd2;
  --line-strong: #c9c1b4;
  --line-ink: rgba(255, 255, 255, 0.13);
  --font-display: "Sora", "Segoe UI", system-ui, sans-serif;
  --font-body: "Inter", "Segoe UI", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", "Consolas", monospace;
  --max: 1240px;
  --pad: clamp(20px, 4vw, 48px);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding-left: var(--pad);
  padding-right: var(--pad);
}

/* ---------- typography helpers ---------- */

.kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--steel);
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 22px;
}
.kicker::before {
  content: "";
  width: 34px;
  height: 2px;
  background: var(--signal);
  flex: none;
}
.on-ink .kicker { color: var(--steel-light); }

.kicker .idx { color: var(--signal); }

h1, h2, h3 { font-family: var(--font-display); font-weight: 700; line-height: 1.08; letter-spacing: -0.02em; }

.display {
  font-size: clamp(40px, 6.4vw, 84px);
  text-wrap: balance;
}
.h-section {
  font-size: clamp(30px, 4vw, 52px);
  max-width: 18ch;
  text-wrap: balance;
}
.lede {
  font-size: clamp(16px, 1.5vw, 19px);
  color: var(--steel);
  max-width: 56ch;
}
.on-ink .lede { color: var(--steel-light); }

.accent { color: var(--signal); }

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  padding: 15px 28px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.2s;
}
.btn .arr { font-family: var(--font-mono); transition: transform 0.2s; }
.btn:hover .arr { transform: translateX(5px); }

.btn-solid { background: var(--signal); color: #fff; }
.btn-solid:hover { background: var(--signal-deep); }

.btn-ghost { border-color: rgba(255, 255, 255, 0.35); color: #fff; }
.btn-ghost:hover { border-color: #fff; background: rgba(255, 255, 255, 0.08); }

.btn-ink { border-color: var(--ink); color: var(--ink); }
.btn-ink:hover { background: var(--ink); color: #fff; }

/* ---------- header ---------- */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 60;
  border-bottom: 1px solid transparent;
  transition: background 0.25s, border-color 0.25s;
}
.site-header.scrolled,
.site-header.solid {
  background: rgba(17, 21, 28, 0.92);
  backdrop-filter: blur(12px);
  border-bottom-color: var(--line-ink);
}
.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}
.logo {
  display: flex;
  align-items: baseline;
  gap: 10px;
  color: #fff;
}
.logo .mark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 24px;
  letter-spacing: 0.02em;
}
.logo .mark::after {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  background: var(--signal);
  margin-left: 5px;
}
.logo .sub {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--steel-light);
}
.main-nav { display: flex; align-items: center; gap: 34px; }
.main-nav a {
  font-size: 14.5px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.78);
  padding: 6px 0;
  position: relative;
}
.main-nav a:not(.btn)::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--signal);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.22s;
}
.main-nav a:not(.btn):hover::after,
.main-nav a.active::after { transform: scaleX(1); }
.main-nav a.active, .main-nav a:hover { color: #fff; }
.main-nav .btn { padding: 11px 22px; font-size: 14px; }

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  color: #fff;
  font-size: 26px;
  cursor: pointer;
}

/* ---------- hero ---------- */

.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: flex-end;
  background: var(--ink);
  color: #fff;
  overflow: hidden;
}
.hero-photo {
  position: absolute;
  inset: 0;
}
.hero-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 42% 50%;
  filter: saturate(0.72) contrast(1.05) brightness(0.92);
}
.hero-photo::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(78deg, rgba(17, 21, 28, 0.97) 22%, rgba(17, 21, 28, 0.62) 52%, rgba(17, 21, 28, 0.28) 100%),
    linear-gradient(0deg, rgba(17, 21, 28, 0.92) 0%, rgba(17, 21, 28, 0) 45%);
}
.hero-inner {
  position: relative;
  z-index: 2;
  width: 100%;
  padding-top: 170px;
  padding-bottom: 64px;
}
.hero-meta {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--steel-light);
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  margin-bottom: 30px;
}
.hero-meta .dot { color: var(--signal); }
.hero h1 { max-width: 13ch; }
.hero h1 .thin { font-weight: 300; color: rgba(255,255,255,0.85); }
.hero .lede { margin-top: 26px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 40px; }

.hero-focus {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  max-width: 720px;
  margin-top: 26px;
}
.hero-focus span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.86);
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(17, 21, 28, 0.38);
  backdrop-filter: blur(10px);
  padding: 8px 10px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line-ink);
  margin-top: 72px;
}
.hero-stats .stat {
  padding: 26px 26px 6px 0;
  border-left: 1px solid var(--line-ink);
  padding-left: 26px;
}
.hero-stats .stat:first-child { border-left: 0; padding-left: 0; }
.stat .num {
  font-family: var(--font-display);
  font-size: clamp(26px, 2.6vw, 38px);
  font-weight: 700;
}
.stat .num sup { font-size: 0.55em; color: var(--signal); }
.stat .lbl {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel-light);
  margin-top: 6px;
}

/* ---------- generic sections ---------- */

section { padding: clamp(72px, 9vw, 130px) 0; }
.on-ink { background: var(--ink); color: #fff; }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: clamp(40px, 5vw, 64px);
}
.section-head .lede { margin-top: 18px; }

/* ---------- product grid ---------- */

.prod-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.main-products-grid { grid-template-columns: repeat(3, 1fr); }
.prod-card {
  background: var(--white);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 26px 26px 24px;
  position: relative;
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.25s;
}
.prod-card:hover { box-shadow: 0 18px 44px -18px rgba(17, 21, 28, 0.28); z-index: 2; }
.prod-card .no {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--steel-light);
}
.prod-card figure {
  margin: 10px 0 16px;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  background: #fff;
}
.prod-card figure img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: transform 0.45s cubic-bezier(0.22, 0.61, 0.36, 1);
}
.prod-card:hover figure img { transform: scale(1.06); }
.prod-card h3 { font-size: 17.5px; letter-spacing: -0.01em; }
.prod-card .series {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--steel);
  margin-top: 6px;
  letter-spacing: 0.03em;
}
.prod-card .go {
  margin-top: auto;
  padding-top: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--signal);
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.22s, transform 0.22s;
}
.prod-card:hover .go { opacity: 1; transform: none; }
.prod-card.is-cta {
  background: var(--ink);
  color: #fff;
  justify-content: center;
  gap: 14px;
  grid-column: span 3;
}
.prod-card.is-cta h3 { font-size: clamp(20px, 1.8vw, 26px); max-width: 12ch; }
.prod-card.is-cta p { color: var(--steel-light); font-size: 14px; }
.prod-card.is-cta .go { opacity: 1; transform: none; }

/* ---------- industries / applications ---------- */

.industry-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(16px, 2vw, 26px);
}
.industry-card {
  display: block;
  background: var(--white);
  border: 1px solid var(--line);
  color: var(--ink);
  overflow: hidden;
  transition: box-shadow 0.25s, transform 0.25s;
}
.industry-card:hover {
  box-shadow: 0 22px 50px -22px rgba(17, 21, 28, 0.32);
  transform: translateY(-4px);
}
.industry-card figure {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--ink-2);
}
.industry-card figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.02);
  transition: transform 0.55s cubic-bezier(0.22, 0.61, 0.36, 1);
}
.industry-card:hover figure img { transform: scale(1.06); }
.industry-card .ic-body { padding: 22px 24px 26px; }
.industry-card h3 {
  font-size: 19px;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 10px;
}
.industry-card h3 .arr {
  font-family: var(--font-mono);
  color: var(--signal);
  margin-left: auto;
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity 0.2s, transform 0.2s;
}
.industry-card:hover h3 .arr { opacity: 1; transform: none; }
.industry-card p { font-size: 14px; color: var(--steel); margin-top: 10px; }
.application-products {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}
.application-products span {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--signal);
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 6px 8px;
}

@media (max-width: 1020px) {
  .industry-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .industry-grid { grid-template-columns: 1fr; }
}

/* ---------- feature split (studio shots on ink) ---------- */

.feature-split {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(36px, 5vw, 80px);
  align-items: center;
}
.feature-figure {
  position: relative;
  background: var(--ink-2);
}
.feature-figure img { width: 100%; }
.feature-figure .tag {
  position: absolute;
  left: 0;
  bottom: 0;
  background: var(--signal);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 10px 16px;
}
.spec-list { margin-top: 34px; border-top: 1px solid var(--line-ink); }
.spec-list li {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 18px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line-ink);
  font-size: 14.5px;
}
.spec-list .k {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--signal);
  padding-top: 3px;
}
.spec-list .v { color: rgba(255, 255, 255, 0.85); }

.thumb-row { display: flex; gap: 12px; margin-top: 26px; }
.thumb-row button {
  width: 72px;
  height: 72px;
  border: 1px solid var(--line-ink);
  background: var(--ink-2);
  padding: 6px;
  cursor: pointer;
  opacity: 0.55;
  transition: opacity 0.2s, border-color 0.2s;
}
.thumb-row button.active, .thumb-row button:hover { opacity: 1; border-color: var(--signal); }
.thumb-row img { width: 100%; height: 100%; object-fit: contain; }

/* ---------- process / factory ---------- */

.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.process-step {
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--white);
}
.process-step figure { aspect-ratio: 4 / 3; overflow: hidden; }
.process-step figure img {
  width: 100%; height: 100%;
  object-fit: cover;
  filter: saturate(0.85);
  transition: transform 0.5s cubic-bezier(0.22, 0.61, 0.36, 1), filter 0.4s;
}
.process-step:hover figure img { transform: scale(1.05); filter: saturate(1); }
.process-step .body { padding: 22px 24px 26px; }
.process-step .no {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--signal);
  letter-spacing: 0.14em;
}
.process-step h3 { font-size: 18px; margin-top: 8px; }
.process-step p { font-size: 14px; color: var(--steel); margin-top: 8px; }

/* ---------- certificates ---------- */

.cert-band { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: clamp(36px, 5vw, 80px); align-items: start; }
.cert-chips { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.chip {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  padding: 9px 16px;
  border: 1px solid var(--ink);
  text-transform: uppercase;
}
.chip.hot { background: var(--signal); border-color: var(--signal); color: #fff; }

.published-media {
  margin: 30px 0;
  border: 1px solid var(--line);
  background: var(--white);
}
.published-media img {
  display: block;
  width: 100%;
  max-height: 560px;
  object-fit: cover;
}
.article-cover-media {
  margin: clamp(28px, 4vw, 42px) 0;
  overflow: hidden;
  background: var(--paper);
}
.article-cover-media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  max-height: none;
  object-fit: cover;
}
.published-article-section {
  margin-top: clamp(34px, 5vw, 54px);
  padding: 0;
}
.published-article-section > h2 {
  margin-top: 0;
}
.published-section-media {
  margin: clamp(22px, 3vw, 32px) 0 0;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--white);
}
.published-section-media img {
  display: block;
  width: 100%;
  max-height: 560px;
  object-fit: contain;
  background: var(--white);
}
.article-cover-media figcaption,
.published-section-media figcaption {
  padding: 12px 16px 14px;
  border-top: 1px solid var(--line);
  color: var(--steel);
  font-size: 13px;
  line-height: 1.5;
}

.product-detail-intro {
  display: grid;
  grid-template-columns: minmax(220px, 360px) minmax(0, 1fr);
  gap: clamp(22px, 4vw, 46px);
  align-items: start;
  margin-top: 34px;
}
.product-detail-intro .published-media {
  margin: 0;
  align-self: start;
}
.product-detail-intro .published-media img {
  max-height: 360px;
  object-fit: contain;
  background: #fff;
  padding: clamp(16px, 3vw, 24px);
}
.product-detail-copy {
  min-width: 0;
}
.product-detail-copy .answer-box {
  margin: 0;
}
.product-detail-copy .cert-chips {
  margin-top: 18px;
}
.product-detail-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

.product-detail-panel {
  margin-top: 34px;
  border: 1px solid var(--line);
  background: var(--white);
  padding: clamp(22px, 3vw, 34px);
  min-width: 0;
}
.product-feature-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.product-feature-grid li {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  min-width: 0;
  padding: 18px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}
.feature-index {
  color: var(--signal);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
}
.product-feature-grid strong {
  display: block;
  font-family: var(--font-display);
  font-size: 16px;
  line-height: 1.3;
}
.product-feature-grid p {
  margin: 5px 0 0;
  color: var(--steel);
  font-size: 14px;
  line-height: 1.55;
  overflow-wrap: anywhere;
}
.model-alias-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.model-alias-grid span {
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 9px 12px;
}
.product-source-note {
  background: transparent;
}
.product-source-note p {
  color: var(--steel);
  font-size: 14px;
}
.ordering-example {
  display: block;
  max-width: 100%;
  width: 100%;
  overflow-x: auto;
  scrollbar-width: thin;
  padding: 16px 18px;
  background: var(--ink);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.ordering-segments {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin-top: 18px;
}
.ordering-segment {
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 14px;
  min-height: 126px;
  min-width: 0;
}
.ordering-segment-code {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--signal);
  margin-bottom: 8px;
}
.ordering-segment strong {
  display: block;
  font-family: var(--font-display);
  font-size: 15px;
  line-height: 1.28;
}
.ordering-option-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
  list-style: none;
  margin: 11px 0 0;
  padding: 0;
}
.ordering-option {
  display: flex;
  align-items: baseline;
  gap: 4px;
  min-width: 0;
  padding: 7px 6px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.35;
}
.ordering-option-wide,
.ordering-option:only-child {
  grid-column: 1 / -1;
}
.ordering-option-key {
  flex: 0 0 auto;
  color: var(--signal);
  font-weight: 700;
}
.ordering-option-key::after {
  content: ":";
}
.ordering-option-value {
  min-width: 0;
  overflow-wrap: anywhere;
}
.table-scroll {
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--line);
  -webkit-overflow-scrolling: touch;
}
.spec-table-group + .spec-table-group {
  margin-top: 24px;
}
.spec-table-group h3 {
  margin: 0 0 12px;
  font-size: 18px;
}
.spec-table {
  width: 100%;
  min-width: 580px;
  border-collapse: collapse;
  font-size: 14px;
}
.spec-table th,
.spec-table td {
  padding: 12px 14px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  overflow-wrap: anywhere;
}
.spec-table th {
  background: var(--ink);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.spec-table th:last-child,
.spec-table td:last-child {
  border-right: 0;
}
.spec-table tbody tr:last-child td {
  border-bottom: 0;
}
.schematic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
  gap: 18px;
}
.schematic-grid figure {
  min-width: 0;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--paper);
}
.schematic-grid img {
  display: block;
  width: 100%;
  max-height: 520px;
  object-fit: contain;
  background: var(--white);
  padding: clamp(12px, 2vw, 22px);
}
.schematic-grid figcaption {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  border-top: 1px solid var(--line);
  color: var(--steel);
  font-size: 13px;
  line-height: 1.45;
}
.schematic-grid figcaption strong {
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 15px;
}
.product-pdf-note {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-left: 4px solid var(--signal);
  background: var(--paper);
}
.product-pdf-note p {
  margin: 0;
  color: var(--steel);
  font-size: 14px;
  line-height: 1.55;
}
.product-pdf-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  flex: 0 0 auto;
  padding: 13px 17px;
  background: var(--ink);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
}
.product-pdf-link:hover {
  background: var(--signal);
}
.product-dimensions table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
  font-size: 13px;
}
.product-dimensions th,
.product-dimensions td {
  border-bottom: 1px solid var(--line);
  border-right: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}
.product-dimensions th {
  background: var(--ink);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.product-dimensions tr:last-child td { border-bottom: 0; }
.table-note {
  margin-top: 12px;
  color: var(--steel);
  font-size: 13px;
}

.cert-shelf { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.cert-shelf figure {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 16px;
}
.cert-shelf img { width: 100%; aspect-ratio: 4/4.6; object-fit: contain; }
.cert-shelf figcaption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--steel);
  margin-top: 12px;
  text-align: center;
}
.cert-shelf figure.wide { grid-column: span 1; }
.cert-shelf figure.wide img { aspect-ratio: 4/3; }

/* ---------- video ---------- */

.video-frame {
  position: relative;
  border: 1px solid var(--line-ink);
  background: #000;
}
.video-frame video { width: 100%; display: block; }
.video-caption {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel-light);
  padding-top: 14px;
}

/* ---------- big CTA ---------- */

.cta-band {
  background: var(--signal);
  color: #fff;
  padding: clamp(64px, 8vw, 110px) 0;
}
.cta-band .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 34px;
}
.cta-band h2 { font-size: clamp(30px, 4.2vw, 56px); max-width: 17ch; }
.cta-band p { margin-top: 14px; color: rgba(255, 255, 255, 0.88); max-width: 46ch; }
.cta-band .btn { background: var(--ink); color: #fff; }
.cta-band .btn:hover { background: #000; }

/* ---------- footer ---------- */

.site-footer { background: var(--ink); color: var(--steel-light); padding: 70px 0 36px; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--line-ink);
}
.site-footer h4 {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: #fff;
  margin-bottom: 18px;
}
.site-footer li { margin-bottom: 10px; font-size: 14.5px; }
.site-footer a:hover { color: #fff; }
.footer-brand p { font-size: 14px; max-width: 34ch; margin-top: 14px; }
.footer-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding-top: 26px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--steel);
}

/* ---------- page hero (inner pages) ---------- */

.page-hero {
  background: var(--ink);
  color: #fff;
  padding: 190px 0 70px;
}
.page-hero .display { font-size: clamp(36px, 5vw, 66px); }
.page-hero .lede { margin-top: 20px; }

/* ---------- products page ---------- */

.product-center-section { padding-top: clamp(42px, 5vw, 72px); }
.product-center-layout {
  display: grid;
  grid-template-columns: 285px minmax(0, 1fr);
  gap: clamp(28px, 4vw, 54px);
  align-items: start;
}
.catalog-sidebar {
  position: sticky;
  top: 96px;
  background: var(--white);
  border: 1px solid var(--line);
  max-height: calc(100vh - 116px);
  overflow: auto;
}
.catalog-sidebar-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  padding: 22px 22px 18px;
  border-bottom: 1px solid var(--line);
}
.catalog-tree { display: grid; }
.tree-group {
  border-bottom: 1px solid var(--line);
  background: var(--white);
}
.tree-top {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: start;
  padding: 16px 22px 10px;
  color: var(--ink);
  font-size: 14px;
}
.tree-top:hover,
.tree-branch a:hover {
  color: var(--signal);
}
.tree-top span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--signal);
  letter-spacing: 0.12em;
}
.tree-top .tree-count {
  align-self: center;
  border-radius: 999px;
  background: var(--paper);
  color: var(--steel);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0;
  padding: 4px 6px;
  text-transform: none;
}
.tree-top strong {
  font-weight: 600;
  line-height: 1.35;
}
.tree-branch {
  display: grid;
  gap: 6px;
  padding: 0 22px 16px 70px;
}
.tree-branch a {
  color: var(--steel);
  font-size: 12.5px;
  line-height: 1.35;
  position: relative;
}
.tree-branch a::before {
  content: "";
  width: 10px;
  height: 1px;
  background: var(--line-strong);
  position: absolute;
  left: -18px;
  top: 0.72em;
}
.catalog-main { min-width: 0; }
.catalog-overview { margin-bottom: clamp(34px, 5vw, 64px); }
.catalog-tools-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  gap: 18px;
  margin-bottom: 18px;
}
.product-search-box,
.recommended-series-box {
  border: 1px solid var(--line);
  background: var(--white);
  padding: 18px;
}
.product-search-box label,
.recommended-title {
  display: block;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 12px;
}
.product-search-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: 10px;
}
.product-search-row input {
  width: 100%;
  border: 1px solid #9aa6b2;
  background: #fff;
  color: var(--ink);
  font: inherit;
  min-height: 46px;
  padding: 11px 13px;
}
.product-search-row input:focus {
  border-color: var(--signal);
  box-shadow: 0 0 0 3px rgba(255, 83, 25, 0.14);
  outline: 0;
}
.product-search-row button {
  border: 1px solid var(--ink);
  background: var(--ink);
  color: #fff;
  font: inherit;
  font-weight: 600;
  min-height: 46px;
  padding: 0 16px;
  cursor: pointer;
}
.product-search-row .search-reset {
  background: #fff;
  color: var(--ink);
  border-color: var(--line-strong);
}
.product-search-box p {
  color: var(--steel);
  font-size: 12.5px;
  margin-top: 10px;
}
.product-search-results {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}
.product-search-results a {
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  display: grid;
  gap: 3px;
  padding: 10px 12px;
}
.product-search-results a:hover {
  border-color: var(--signal);
}
.product-search-results strong {
  font-size: 13px;
}
.product-search-results span {
  color: var(--steel);
  font-size: 11.5px;
  line-height: 1.3;
}
.recommended-series-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}
.recommended-series-grid a {
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  font-size: 12.5px;
  line-height: 1.25;
  min-height: 38px;
  padding: 10px 11px;
}
.recommended-series-grid a:hover,
.full-series-strip a:hover {
  border-color: var(--signal);
  color: var(--signal);
}
.full-series-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: clamp(24px, 4vw, 42px);
}
.full-series-strip span,
.full-series-strip a {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
}
.full-series-strip span {
  color: var(--signal);
  text-transform: uppercase;
  margin-right: 4px;
}
.full-series-strip a {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  padding: 8px 10px;
}
.catalog-search-hidden {
  display: none !important;
}
.catalog-page-hidden {
  display: none !important;
}
.catalog-search-empty {
  border: 1px dashed var(--line-strong);
  background: var(--paper);
  color: var(--steel);
  padding: 18px;
  margin-bottom: 18px;
}
.catalog-pagination {
  display: flex;
  justify-content: center;
  padding-top: 24px;
}
.catalog-pagination[hidden] {
  display: none;
}
.catalog-load-more {
  appearance: none;
  min-height: 46px;
  border: 1px solid var(--ink);
  border-radius: 5px;
  background: var(--ink);
  color: #fff;
  cursor: pointer;
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  padding: 11px 22px;
}
.catalog-load-more:hover,
.catalog-load-more:focus-visible {
  border-color: var(--signal);
  background: var(--signal);
  outline: 0;
}
.catalog-load-more:focus-visible {
  box-shadow: 0 0 0 3px rgba(255, 83, 25, 0.2);
}
.model-card.catalog-search-focus {
  border-color: var(--signal);
  box-shadow: 0 0 0 3px rgba(255, 83, 25, 0.13);
}
.airtac-reference-panel {
  background: #fff;
  border: 1px solid #d7d7d7;
  padding: 18px 18px 28px;
  margin-bottom: clamp(34px, 5vw, 64px);
}
.airtac-path {
  color: #4a5b6e;
  font-size: 13px;
  border-bottom: 1px solid #e5e5e5;
  padding-bottom: 12px;
  margin-bottom: 18px;
}
.airtac-category-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(260px, 330px));
  gap: 30px 68px;
  justify-content: center;
}
.airtac-category-card {
  display: grid;
  grid-template-rows: auto 145px;
  border: 1px solid #cfcfcf;
  background: #fff;
  color: #28384a;
  text-align: center;
  transition: border-color 0.18s, box-shadow 0.18s;
}
.airtac-category-card:hover {
  border-color: #8faed0;
  box-shadow: 0 6px 18px rgba(16, 24, 40, 0.08);
}
.airtac-card-title {
  min-height: 28px;
  padding: 7px 10px 6px;
  border-bottom: 1px solid #e3e3e3;
  background: #fafafa;
  font-size: 13px;
  line-height: 1.2;
}
.airtac-category-card figure {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px 22px;
  background: #fff;
}
.airtac-category-card img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.catalog-card-link {
  display: inline-flex;
  align-items: center;
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--signal);
}
.catalog-card-link::after {
  content: "→";
  margin-left: 8px;
}
.catalog-board {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.catalog-card {
  background: var(--white);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  min-height: 100%;
}
.catalog-card-large { grid-column: span 2; }
.catalog-board .catalog-card:last-child { grid-column: span 2; }
.catalog-card figure {
  aspect-ratio: 16 / 9;
  padding: 24px;
  background: #fff;
}
.catalog-card figure img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.catalog-card-body { padding: 24px; }
.catalog-card .no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--signal);
  text-transform: uppercase;
}
.catalog-card h3 {
  font-size: clamp(22px, 2vw, 30px);
  margin-top: 9px;
}
.catalog-card p {
  color: var(--steel);
  margin-top: 12px;
}
.catalog-sublist {
  display: grid;
  gap: 9px;
  margin-top: 18px;
}
.catalog-sublist li {
  font-size: 13px;
  color: var(--steel);
  border-left: 2px solid var(--signal);
  padding-left: 12px;
}
.series-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}
.series-cloud span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink);
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 7px 9px;
}
.catalog-detail-stack {
  display: grid;
  gap: clamp(28px, 4vw, 46px);
}
.catalog-detail {
  scroll-margin-top: 112px;
  background: var(--white);
  border: 1px solid var(--line);
}
.detail-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 230px;
  gap: clamp(22px, 4vw, 46px);
  align-items: center;
  padding: clamp(24px, 4vw, 38px);
}
.detail-head .no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--signal);
  text-transform: uppercase;
}
.detail-head h3 {
  font-size: clamp(28px, 3.2vw, 42px);
  margin-top: 10px;
}
.detail-head p {
  color: var(--steel);
  margin-top: 12px;
  max-width: 62ch;
}
.detail-media {
  aspect-ratio: 4 / 3;
  background: var(--paper);
  padding: 18px;
}
.detail-media img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.series-groups {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}
.series-panel {
  scroll-margin-top: 112px;
  padding: clamp(20px, 3vw, 28px);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  min-width: 0;
}
.series-panel:nth-child(2n) { border-right: 0; }
.series-panel:nth-last-child(-n + 2) { border-bottom: 0; }
.series-groups.airtac-model-sections {
  display: block;
  border-top: 1px solid var(--line);
}
.series-panel.airtac-model-section,
.series-panel.airtac-model-section:nth-child(2n),
.series-panel.airtac-model-section:nth-last-child(-n + 2) {
  border-right: 0;
  border-bottom: 1px solid var(--line);
}
.series-panel.airtac-model-section:last-child {
  border-bottom: 0;
}
.series-title {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 12px;
  align-items: start;
  margin-bottom: 16px;
}
.series-title span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--signal);
  padding-top: 5px;
}
.series-title h4 {
  font-size: clamp(18px, 1.8vw, 24px);
  line-height: 1.22;
}
.series-media {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 156px;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  background: #fff;
  padding: 14px;
  margin-bottom: 16px;
}
.series-media img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.series-media.is-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.series-media.is-pair img {
  min-width: 0;
}
.series-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.airtac-model-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}
.model-card {
  display: grid;
  grid-template-rows: 148px auto 1fr;
  border: 1px solid #cfcfcf;
  background: #fff;
  min-width: 0;
  text-align: center;
  color: inherit;
  text-decoration: none;
}
.model-card--text-only {
  grid-template-rows: auto 1fr;
  min-height: 236px;
  align-content: center;
  background: #f8f7f3;
}
.model-card figure {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
  background: #fff;
  border-bottom: 1px solid #e6e6e6;
}
.model-card img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.model-card--text-only h5 {
  min-height: 0;
  padding-top: 42px;
  background: transparent;
}
.model-card h5 {
  min-height: 36px;
  padding: 9px 8px 7px;
  background: #f9f9f9;
  color: var(--ink);
  font-size: 13px;
  line-height: 1.25;
  font-weight: 600;
}
.model-card p {
  border-top: 1px solid #e6e6e6;
  color: var(--steel);
  font-size: 11.5px;
  line-height: 1.35;
  padding: 8px 8px 10px;
  min-height: 44px;
}
.model-card--text-only p {
  border-top: 0;
  padding: 8px 18px 42px;
}

/* ---------- confirmed product-center redesign ---------- */

.catalog-sidebar-search {
  border-bottom: 1px solid var(--line);
  padding: 18px;
}
.catalog-sidebar-search.product-search-box {
  border-left: 0;
  border-right: 0;
  border-top: 0;
}
.catalog-sidebar-search .product-search-row {
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 7px;
}
.catalog-sidebar-search .product-search-row input,
.catalog-sidebar-search .product-search-row button {
  min-height: 40px;
}
.catalog-sidebar-search .product-search-row button {
  padding-inline: 12px;
}
.catalog-sidebar-search .search-reset {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--steel);
  cursor: pointer;
  font: inherit;
  font-size: 12px;
  margin-top: 8px;
  padding: 0;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.catalog-sidebar-search .product-search-results {
  max-height: 230px;
  overflow: auto;
}
.catalog-tree .tree-group {
  position: relative;
}
.tree-group-toggle {
  appearance: none;
  position: absolute;
  right: 15px;
  top: 13px;
  width: 30px;
  height: 30px;
  border: 0;
  background: transparent;
  color: var(--steel);
  cursor: pointer;
  font-size: 0;
}
.tree-group-toggle::before {
  content: "";
  position: absolute;
  inset: 9px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform 0.2s ease;
}
.tree-group-toggle[aria-expanded="false"]::before {
  transform: rotate(-45deg) translate(-1px, -1px);
}
.tree-top {
  padding-right: 48px;
}
.tree-group[data-collapsed="true"] .tree-branch {
  display: none;
}
.tree-section {
  border-top: 1px solid rgba(18, 35, 51, 0.06);
}
.tree-section:first-child {
  border-top: 0;
}
.tree-section-toggle {
  display: flex;
  width: 100%;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
}
.tree-section-count {
  flex: 0 0 auto;
  border-radius: 999px;
  background: var(--paper);
  color: var(--steel);
  font-family: var(--font-mono);
  font-size: 9px;
  line-height: 1;
  padding: 4px 6px;
}
.tree-section-toggle::after {
  content: "+";
  flex: 0 0 auto;
  color: var(--signal);
  font: 600 14px/1 var(--font-mono);
}
.tree-section-toggle[aria-expanded="true"]::after {
  content: "−";
}
.tree-model-list {
  display: grid;
  gap: 4px;
  list-style: none;
  margin: 2px 0 10px;
  padding: 0 0 0 15px;
}
.tree-model-list[hidden] {
  display: none;
}
.tree-model-list a {
  display: block;
  border-left: 1px solid var(--line-strong);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 10.5px;
  line-height: 1.3;
  padding: 4px 8px;
}
.tree-model-list a::before {
  display: none;
}
.tree-model-list a:hover,
.tree-model-list a:focus-visible {
  border-left-color: var(--signal);
  color: var(--signal);
  outline: 0;
}
.catalog-filter-panel {
  border-top: 1px solid var(--line);
  padding: 18px;
}
.catalog-filter-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 16px;
}
.catalog-filter-heading span,
.catalog-filter-heading strong {
  display: block;
}
.catalog-filter-heading span {
  color: var(--signal);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.catalog-filter-heading strong {
  color: var(--ink);
  font-size: 13px;
  line-height: 1.35;
  margin-top: 4px;
}
.catalog-filter-heading button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--steel);
  cursor: pointer;
  font: inherit;
  font-size: 11px;
  padding: 2px 0;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.catalog-filter-group + .catalog-filter-group {
  border-top: 1px solid var(--line);
  margin-top: 14px;
  padding-top: 14px;
}
.catalog-filter-group h3 {
  color: var(--ink);
  font-size: 12.5px;
  margin-bottom: 9px;
}
.catalog-filter-options {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}
.catalog-filter-option {
  position: relative;
}
.catalog-filter-option input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.catalog-filter-option span {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: #fff;
  color: var(--steel);
  cursor: pointer;
  font-size: 10.5px;
  line-height: 1.2;
  padding: 6px 9px;
}
.catalog-filter-option input:checked + span {
  border-color: var(--ink);
  background: var(--ink);
  color: #fff;
}
.catalog-filter-option input:focus-visible + span {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}
.catalog-filter-status {
  color: var(--steel);
  font-size: 11px;
  line-height: 1.4;
  margin-top: 14px;
}
.catalog-result-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  border: 1px solid var(--line);
  background: var(--white);
  margin-bottom: 18px;
  padding: 15px 18px;
}
.catalog-result-bar span,
.catalog-result-bar strong {
  display: block;
}
.catalog-result-bar span {
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
}
.catalog-result-bar strong {
  color: var(--steel);
  font-size: 12px;
  font-weight: 500;
  margin-top: 3px;
}
.catalog-view-toggle {
  display: inline-flex;
  border: 1px solid var(--line-strong);
}
.catalog-view-toggle button {
  appearance: none;
  border: 0;
  background: #fff;
  color: var(--steel);
  cursor: pointer;
  font: inherit;
  font-size: 12px;
  min-height: 36px;
  padding: 0 13px;
}
.catalog-view-toggle button + button {
  border-left: 1px solid var(--line-strong);
}
.catalog-view-toggle button.active {
  background: var(--ink);
  color: #fff;
}
.catalog-detail-stack {
  gap: 22px;
}
.catalog-detail {
  border-radius: 8px;
  overflow: hidden;
}
.detail-head {
  grid-template-columns: minmax(0, 1fr) 150px;
  padding: 22px 24px;
}
.detail-head h3 {
  font-size: clamp(23px, 2.4vw, 32px);
  margin-top: 6px;
}
.detail-head p {
  font-size: 13px;
  margin-top: 7px;
}
.detail-media {
  aspect-ratio: 16 / 9;
  padding: 10px;
}
.series-panel.airtac-model-section {
  padding: 22px;
}
.series-title {
  margin-bottom: 13px;
}
.airtac-model-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}
.model-card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: #fff;
  min-width: 0;
  text-align: left;
  box-shadow: 0 8px 22px rgba(20, 43, 63, 0.05);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}
.model-card:hover {
  border-color: var(--line-strong);
  box-shadow: 0 14px 32px rgba(20, 43, 63, 0.1);
  transform: translateY(-2px);
}
.model-card-primary {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  color: inherit;
  text-decoration: none;
}
.model-card-primary figure,
.model-card figure {
  min-height: 164px;
  height: 164px;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
  padding: 14px;
}
.model-card-primary img,
.model-card img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.model-card-copy {
  background: var(--white);
  padding: 15px 15px 10px;
}
.model-card h5 {
  min-height: 0;
  background: transparent;
  color: var(--ink);
  font-size: 15px;
  line-height: 1.25;
  padding: 0;
}
.model-card p {
  min-height: 0;
  border-top: 0;
  color: var(--steel);
  font-size: 12px;
  line-height: 1.45;
  padding: 6px 0 0;
}
.model-card-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 0 15px 10px;
}
.model-card-fact {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  min-height: 27px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--signal);
  border-radius: 2px;
  background: #faf8f3;
  color: var(--ink-2);
  font-size: 10.5px;
  line-height: 1.25;
  padding: 5px 8px;
}
.model-card-fact[data-kind="material"],
.model-card-fact[data-kind="pressure"] {
  background: #faf8f3;
  color: var(--ink-2);
}
.model-card-medium {
  border-top: 1px dashed var(--line);
  color: var(--steel);
  font-size: 11px;
  line-height: 1.4;
  margin-top: auto;
  padding: 10px 15px 12px;
}
.model-card-medium strong {
  color: var(--ink);
  font-weight: 600;
}
.model-card-actions {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 7px;
  border-top: 1px solid var(--line);
  background: #faf8f3;
  padding: 10px;
}
.model-card-actions.has-no-pdf {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.model-card-actions a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  border: 1px solid var(--line-strong);
  border-radius: 5px;
  color: var(--ink);
  font-size: 10.5px;
  font-weight: 600;
  line-height: 1.2;
  padding: 6px;
  text-align: center;
}
.model-card-actions a:hover {
  border-color: var(--signal);
  color: var(--signal);
}
.model-card-actions .is-download::after {
  content: " \2193";
  color: var(--signal);
  font-size: 12px;
}
.model-card-actions .is-primary {
  border-color: var(--ink);
  background: var(--ink);
  color: #fff;
}
.model-card-actions .is-primary:hover {
  border-color: var(--signal);
  background: var(--signal);
  color: #fff;
}
.model-card-actions .is-disabled {
  display: none;
}

.download-toast {
  position: fixed;
  right: clamp(16px, 3vw, 40px);
  bottom: clamp(16px, 3vw, 32px);
  z-index: 1200;
  max-width: min(360px, calc(100vw - 32px));
  border-left: 4px solid var(--signal);
  background: var(--ink);
  box-shadow: 0 16px 40px rgba(17, 21, 28, 0.24);
  color: var(--white);
  font-size: 13px;
  font-weight: 600;
  line-height: 1.45;
  opacity: 0;
  padding: 14px 18px;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity 0.18s ease, transform 0.18s ease;
}
.download-toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.catalog-detail-stack.is-list-view .airtac-model-grid {
  grid-template-columns: 1fr;
}
.catalog-detail-stack.is-list-view .model-card {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr) minmax(250px, 0.7fr);
  align-items: stretch;
}
.catalog-detail-stack.is-list-view .model-card-primary {
  display: grid;
  grid-column: 1 / 3;
  grid-template-columns: 190px minmax(0, 1fr);
}
.catalog-detail-stack.is-list-view .model-card-primary figure {
  grid-row: 1 / 3;
  height: 100%;
  min-height: 150px;
  border-bottom: 0;
  border-right: 1px solid var(--line);
}
.catalog-detail-stack.is-list-view .model-card-facts,
.catalog-detail-stack.is-list-view .model-card-medium {
  grid-column: 2;
}
.catalog-detail-stack.is-list-view .model-card-actions {
  grid-column: 3;
  grid-row: 1;
  align-content: center;
  border-top: 0;
  border-left: 1px solid var(--line);
}
.series-tags span,
.mini-series span {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  padding: 7px 10px;
  font-size: 12.5px;
  line-height: 1.35;
}
.mini-series {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 14px;
  margin-top: 14px;
  border-top: 1px dashed var(--line-strong);
}
.mini-series:first-of-type {
  padding-top: 0;
  margin-top: 0;
  border-top: 0;
}
.mini-series b {
  width: 100%;
  color: var(--ink);
  font-size: 13px;
  line-height: 1.3;
}

.cat-row {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: clamp(28px, 4vw, 64px);
  padding: clamp(36px, 4vw, 56px) 0;
  border-top: 1px solid var(--line);
  align-items: center;
}
.cat-row:last-child { border-bottom: 1px solid var(--line); }
.cat-row figure {
  background: var(--white);
  border: 1px solid var(--line);
  aspect-ratio: 1/1;
  padding: 26px;
}
.cat-row figure img { width: 100%; height: 100%; object-fit: contain; }
.cat-row .no { font-family: var(--font-mono); font-size: 12px; color: var(--signal); letter-spacing: 0.16em; }
.cat-row h3 { font-size: clamp(22px, 2.2vw, 30px); margin-top: 10px; }
.cat-row p { color: var(--steel); margin-top: 12px; max-width: 60ch; }
.cat-row .series-line {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--ink);
  background: var(--white);
  border: 1px solid var(--line);
  display: inline-block;
  padding: 8px 14px;
  margin-top: 18px;
}
.cat-row .series-line b { color: var(--signal); font-weight: 500; }

/* ---------- about page ---------- */

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
}
.photo-stack { position: relative; }
.photo-stack .main { border: 1px solid var(--line); }
.photo-stack .badge {
  position: absolute;
  right: -16px;
  bottom: -16px;
  background: var(--ink);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 14px 18px;
}
.gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.gallery figure { overflow: hidden; background: var(--ink-2); }
.gallery img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  filter: saturate(0.85);
  transition: transform 0.5s, filter 0.3s;
}
.gallery figure:hover img { transform: scale(1.05); filter: saturate(1.05); }
.gallery figcaption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--steel-light);
  padding: 10px 2px 12px;
}
.gallery .span2 { grid-column: span 2; }
.gallery .span2 img { aspect-ratio: 8/3; }

/* ---------- contact page ---------- */

.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(36px, 5vw, 80px);
  align-items: start;
}
.contact-card { border-top: 1px solid var(--line); }
.contact-card li {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
}
.contact-card .k {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--signal);
  padding-top: 3px;
}
.contact-card a { border-bottom: 1px solid var(--line); }
.contact-card a:hover { border-color: var(--signal); color: var(--signal); }

.rfq-form {
  background: var(--white);
  border: 1px solid var(--line);
  padding: clamp(28px, 3vw, 44px);
}
.rfq-form h3 { font-size: 22px; }
.rfq-form .hint { font-size: 13.5px; color: var(--steel); margin-top: 8px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 18px; }
.form-row.single { grid-template-columns: 1fr; }
.field label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
  margin-bottom: 8px;
}
.field input, .field textarea, .field select {
  width: 100%;
  font-family: var(--font-body);
  font-size: 15px;
  padding: 13px 14px;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  outline: none;
  transition: border-color 0.2s, background 0.2s;
}
.field input:focus, .field textarea:focus { border-color: var(--signal); background: #fff; }
.field textarea { min-height: 130px; resize: vertical; }
.rfq-form .btn { margin-top: 26px; width: 100%; justify-content: center; }
.rfq-honeypot { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }
.form-status { min-height: 22px; margin-top: 18px; color: var(--steel); font-size: 14px; }
.rfq-form button[disabled] { opacity: 0.68; cursor: wait; }

/* ---------- reveal animation ---------- */

.reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- responsive ---------- */

@media (max-width: 1020px) {
  .prod-grid { grid-template-columns: repeat(3, 1fr); }
  .prod-card.is-cta { grid-column: span 2; }
  .process-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .hero-stats .stat { border-left: 0; padding-left: 0; }
  .cat-row { grid-template-columns: 280px 1fr; }
  .product-center-layout { grid-template-columns: 1fr; }
  .catalog-sidebar { position: static; max-height: none; overflow: visible; }
  .catalog-tools-panel { grid-template-columns: 1fr; }
  .catalog-tree { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tree-group:nth-child(2n - 1) { border-right: 1px solid var(--line); }
  .airtac-model-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .catalog-filter-panel { border: 1px solid var(--line); border-top: 0; }
}

@media (max-width: 1120px) {
  .main-nav {
    position: fixed;
    top: 76px; left: 0; right: 0;
    background: var(--ink);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 10px var(--pad) 26px;
    border-bottom: 1px solid var(--line-ink);
    display: none;
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 14px 0; font-size: 17px; }
  .nav-toggle { display: block; }
}

@media (max-width: 760px) {
  .article-cover-media {
    margin: 24px 0 32px;
  }
  .article-cover-media img {
    aspect-ratio: 4 / 3;
  }
  .published-article-section {
    margin-top: 34px;
  }
  .published-section-media {
    margin-top: 18px;
  }
  .published-section-media figcaption {
    padding: 10px 12px 12px;
    font-size: 12px;
  }
  .prod-grid { grid-template-columns: repeat(2, 1fr); }
  .prod-card.is-cta { grid-column: span 1; }
  .feature-split, .cert-band, .split, .contact-grid { grid-template-columns: 1fr; }
  .catalog-board { grid-template-columns: 1fr; }
  .catalog-card-large { grid-column: span 1; }
  .catalog-board .catalog-card:last-child { grid-column: span 1; }
  .catalog-tree { grid-template-columns: 1fr; }
  .recommended-series-grid { grid-template-columns: 1fr; }
  .tree-group:nth-child(2n - 1) { border-right: 0; }
  .airtac-category-grid { grid-template-columns: 1fr; gap: 18px; }
  .airtac-category-card { grid-template-rows: auto 132px; }
  .airtac-model-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .catalog-detail,
  .airtac-model-section {
    content-visibility: auto;
    contain-intrinsic-size: 1px 860px;
  }
  .catalog-pagination {
    padding-top: 18px;
  }
  .catalog-load-more {
    width: min(100%, 360px);
  }
  .catalog-result-bar { align-items: flex-start; flex-direction: column; }
  .catalog-detail-stack.is-list-view .model-card,
  .catalog-detail-stack.is-list-view .model-card-primary {
    display: flex;
    grid-template-columns: none;
  }
  .catalog-detail-stack.is-list-view .model-card-primary figure {
    height: 164px;
    min-height: 164px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .catalog-detail-stack.is-list-view .model-card-actions {
    border-top: 1px solid var(--line);
    border-left: 0;
  }
  .detail-head { grid-template-columns: 1fr; }
  .detail-media { max-width: 320px; }
  .series-groups { grid-template-columns: 1fr; }
  .series-panel,
  .series-panel:nth-child(2n) {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .series-panel:last-child { border-bottom: 0; }
  .cat-row { grid-template-columns: 1fr; }
  .cat-row figure { max-width: 340px; }
  .form-row { grid-template-columns: 1fr; }
  .gallery { grid-template-columns: 1fr 1fr; }
  .gallery .span2 { grid-column: span 2; }
  .product-detail-intro {
    grid-template-columns: 1fr;
  }
  .product-detail-intro .published-media {
    max-width: 340px;
  }
  .product-feature-grid {
    grid-template-columns: 1fr;
  }
  .ordering-segments {
    grid-template-columns: 1fr;
  }
  .product-pdf-note {
    align-items: stretch;
    flex-direction: column;
  }
  .product-pdf-link {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .prod-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: 1fr 1fr; }
  .product-search-row { grid-template-columns: 1fr; }
  .catalog-sidebar-search .product-search-row { grid-template-columns: 1fr; }
  .tree-top { grid-template-columns: 32px minmax(0, 1fr) auto; padding: 15px 18px 9px; }
  .tree-branch { padding: 0 18px 15px 62px; }
  .detail-head { padding: 22px; }
  .series-title { grid-template-columns: 1fr; gap: 5px; }
  .airtac-reference-panel { padding: 14px; }
  .model-card { grid-template-rows: 122px auto 1fr; }
  .model-card h5 { font-size: 12.5px; }
  .model-card p { font-size: 11px; }
  .airtac-model-grid { grid-template-columns: 1fr; }
  .product-detail-panel {
    padding: 18px;
  }
  .product-feature-grid li {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 10px;
    padding: 14px;
  }
  .ordering-example {
    padding: 13px 14px;
    font-size: 13px;
  }
  .spec-table {
    min-width: 520px;
  }
}