/*
 * SorbiTech Design System — main.css
 * German industrial aesthetic: precision typography, disciplined mono-blue palette,
 * generous whitespace, no decoration, maximum clarity.
 * Reference companies: GEA Group, BASF, Linde, Clariant, Alfa Laval.
 *
 * Brand identity:
 *   #4A86E8  SorbiTech Blue        — CTAs, links, accents
 *   #2F66C4  Blue 700              — hover states, deep accents
 *   #1E4FA0  Blue 900              — hero backgrounds, nav headers
 *   #88AAEF  Blue 300              — highlights, hover fills
 *   #EBF1FB  Blue Tint             — callout backgrounds
 *   #434343  Dark Gray             — body text, headings
 *   #727272  Mid Gray              — secondary text, captions
 *   #D9D9D9  Light Gray            — borders
 *   #F5F5F5  Off-White             — alt section backgrounds
 *   #C03A2B  Error Red             — validation errors only
 *
 * Typography: Saira SemiBold 600 (headings) + Saira Regular 400 (body) + Anton (tagline only)
 */

/* ── CSS Custom Properties ─────────────────────────────────────────────────── */
:root {
  --st-blue-900: #1E4FA0;
  --st-blue-700: #2F66C4;
  --st-blue-500: #4A86E8;
  --st-blue-300: #88AAEF;
  --st-blue-50:  #EBF1FB;

  --st-gray-800: #434343;
  --st-gray-600: #727272;
  --st-gray-300: #D9D9D9;
  --st-gray-100: #F0F0F0;
  --st-off-white: #F5F5F5;
  --st-white:    #FFFFFF;
  --st-error:    #C03A2B;

  --st-font-sans:    'Saira', system-ui, -apple-system, sans-serif;
  --st-font-tagline: 'Anton', sans-serif;

  --st-container-max: 1280px;
  --st-container-narrow: 780px;
  --st-container-wide: 1440px;

  /* Premium industrial: subtle radius + blue-tinted elevation (V8.3 refresh) */
  --st-radius:     6px;     /* buttons, inputs, chips */
  --st-radius-lg: 12px;     /* cards, panels, images */
  --st-radius-pill: 999px;
  --st-shadow:    none;
  --st-shadow-sm: 0 1px 2px rgba(16,42,90,.06), 0 2px 6px rgba(16,42,90,.07);
  --st-shadow-md: 0 6px 18px rgba(16,42,90,.10), 0 2px 6px rgba(16,42,90,.06);
  --st-shadow-lg: 0 18px 44px rgba(16,42,90,.18), 0 6px 14px rgba(16,42,90,.10);
  --st-ring:      0 0 0 1px rgba(74,134,232,.35);

  --st-transition: 180ms cubic-bezier(.2,.7,.2,1);

  --st-space-1:  4px;
  --st-space-2:  8px;
  --st-space-3: 12px;
  --st-space-4: 16px;
  --st-space-5: 24px;
  --st-space-6: 32px;
  --st-space-7: 48px;
  --st-space-8: 64px;
  --st-space-9: 96px;
}

/* ── Reset ─────────────────────────────────────────────────────────────────── */
*,
*::before,
*::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--st-font-sans);
  font-weight: 400;
  font-size: 1rem;
  line-height: 1.65;
  color: var(--st-gray-800);
  background: var(--st-white);
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; height: auto; }
a { color: var(--st-blue-700); text-decoration: none; }
a:hover { color: var(--st-blue-900); text-decoration: underline; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; }

/* ── Accessibility ──────────────────────────────────────────────────────────── */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.st-skip-link {
  position: absolute; top: -100%; left: var(--st-space-4); z-index: 9999;
  background: var(--st-blue-900); color: var(--st-white);
  padding: var(--st-space-2) var(--st-space-4); font-weight: 600;
  transition: top var(--st-transition);
}
.st-skip-link:focus { top: var(--st-space-2); }

:focus-visible {
  outline: 2px solid var(--st-blue-500);
  outline-offset: 2px;
}

/* ── Layout containers ─────────────────────────────────────────────────────── */
.st-container {
  width: 100%; max-width: var(--st-container-max);
  margin-inline: auto; padding-inline: var(--st-space-6);
}
.st-container--narrow  { max-width: var(--st-container-narrow); }
.st-container--wide    { max-width: var(--st-container-wide); }

/* Two-column main + aside layout */
.st-layout--main-aside {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: var(--st-space-7);
  align-items: start;
}
@media (max-width: 900px) {
  .st-layout--main-aside {
    grid-template-columns: 1fr;
  }
  .st-layout__aside { order: -1; }
}

/* ── Typography ────────────────────────────────────────────────────────────── */
.st-hero__title,
h1, h2, h3, h4 {
  font-family: var(--st-font-sans);
  font-weight: 600;
  line-height: 1.2;
  color: var(--st-gray-800);
}

h1 { font-size: clamp(2rem, 4vw, 2.75rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
h3 { font-size: 1.375rem; }
h4 { font-size: 1.125rem; }

.st-eyebrow {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--st-blue-500);
  margin-bottom: var(--st-space-3);
}
.st-eyebrow__link {
  color: inherit;
  text-decoration: none;
}
.st-eyebrow__link:hover {
  text-decoration: underline;
}

/* ── Section patterns ──────────────────────────────────────────────────────── */
.st-section {
  padding-block: var(--st-space-9);
}
.st-section--alt {
  background: var(--st-off-white);
}
.st-section--blue-tint {
  background: var(--st-blue-50);
}
.st-section--entity-strip {
  padding-block: var(--st-space-7);
  background: var(--st-blue-900);
}
.st-section--engage {
  background: var(--st-off-white);
}

.st-section__header {
  margin-bottom: var(--st-space-7);
}
.st-section__label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--st-blue-500);
  margin-bottom: var(--st-space-3);
}
.st-section__title {
  font-size: clamp(1.5rem, 2.5vw, 1.875rem);
  margin-bottom: var(--st-space-4);
}
.st-section__lead {
  font-size: 1.0625rem;
  color: var(--st-gray-600);
  max-width: 640px;
}
.st-section__cta {
  margin-top: var(--st-space-6);
}

/* ── Hero band ─────────────────────────────────────────────────────────────── */
.st-hero {
  padding-block: var(--st-space-8);
  border-bottom: 1px solid var(--st-gray-300);
}
.st-hero--entity {
  background: var(--st-off-white);
  border-bottom: 3px solid var(--st-blue-500);
  padding-block: var(--st-space-7);
}
.st-hero--hub {
  background: var(--st-blue-900);
  color: var(--st-white);
  padding-block: var(--st-space-8);
}
.st-hero--hub .st-hero__title { color: var(--st-white); }
.st-hero--hub .st-hero__lead  { color: var(--st-blue-300); }
.st-hero--hub .st-eyebrow a   { color: var(--st-blue-300); }

.st-hero--page {
  background: var(--st-off-white);
  border-bottom: 3px solid var(--st-blue-500);
}
.st-hero--capture {
  background: var(--st-blue-900);
  color: var(--st-white);
}
.st-hero--capture .st-hero__title { color: var(--st-white); }
.st-hero--capture .st-eyebrow     { color: var(--st-blue-300); }

.st-hero__title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin-bottom: var(--st-space-4);
}
.st-hero__lead {
  font-size: 1.0625rem;
  color: var(--st-gray-600);
  max-width: 600px;
  margin-bottom: var(--st-space-5);
}
.st-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--st-space-3);
}

/* Homepage hero */
.st-hero--home {
  background: var(--st-blue-900);
  color: var(--st-white);
  padding-block: var(--st-space-9);
}
.st-hero--home__inner {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: var(--st-space-8);
  align-items: center;
}
@media (max-width: 960px) {
  .st-hero--home__inner { grid-template-columns: 1fr; }
}
.st-hero--home__title {
  font-size: clamp(2.25rem, 5vw, 3.25rem);
  color: var(--st-white);
  margin-bottom: var(--st-space-4);
}
.st-hero--home__lead {
  font-size: 1.125rem;
  color: var(--st-blue-300);
  max-width: 560px;
  margin-bottom: var(--st-space-6);
}

/* Credentials strip on home hero */
.st-hero--home__credentials {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--st-space-4);
}
.st-cred-item {
  border-left: 3px solid var(--st-blue-500);
  padding-left: var(--st-space-4);
}
.st-cred-item__number {
  display: block;
  font-size: 2.5rem;
  font-weight: 600;
  color: var(--st-white);
  line-height: 1;
}
.st-cred-item__label {
  display: block;
  font-size: 0.875rem;
  color: var(--st-blue-300);
  margin-top: var(--st-space-1);
}
.st-cred-item__sub {
  display: block;
  font-size: 0.75rem;
  color: var(--st-blue-300);
  opacity: 0.7;
  margin-top: 2px;
}

/* ── Buttons ───────────────────────────────────────────────────────────────── */
.st-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--st-space-2);
  font-family: var(--st-font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1;
  padding: 0.75rem 1.5rem;
  border: 2px solid transparent;
  border-radius: var(--st-radius);   /* Sharp — no radius */
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--st-transition), border-color var(--st-transition), color var(--st-transition);
  white-space: nowrap;
}

.st-btn--primary {
  background: var(--st-blue-500);
  border-color: var(--st-blue-500);
  color: var(--st-white);
}
.st-btn--primary:hover {
  background: var(--st-blue-700);
  border-color: var(--st-blue-700);
  color: var(--st-white);
  text-decoration: none;
}

.st-btn--outline {
  background: transparent;
  border-color: var(--st-blue-500);
  color: var(--st-blue-700);
}
.st-btn--outline:hover {
  background: var(--st-blue-50);
  color: var(--st-blue-900);
  text-decoration: none;
}

.st-btn--white {
  background: var(--st-white);
  border-color: var(--st-white);
  color: var(--st-blue-900);
}
.st-btn--white:hover {
  background: var(--st-blue-50);
  text-decoration: none;
}

.st-btn--lg  { padding: 1rem 2rem; font-size: 1rem; }
.st-btn--sm  { padding: 0.5rem 1rem; font-size: 0.875rem; }
.st-btn--full { width: 100%; }

/* ── Spec card ─────────────────────────────────────────────────────────────── */
.st-spec-card {
  border: 1px solid var(--st-gray-300);
  padding: var(--st-space-5);
  position: sticky;
  top: 100px;
}
.st-spec-card__title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--st-space-4);
  padding-bottom: var(--st-space-3);
  border-bottom: 2px solid var(--st-blue-500);
  color: var(--st-gray-800);
}
.st-spec-table {
  width: 100%;
  border-collapse: collapse;
}
.st-spec-table th,
.st-spec-table td {
  padding: var(--st-space-2) var(--st-space-3);
  font-size: 0.875rem;
  border-bottom: 1px solid var(--st-gray-300);
  vertical-align: top;
}
.st-spec-table th {
  font-weight: 600;
  color: var(--st-gray-600);
  width: 50%;
  background: var(--st-gray-100);
  text-align: left;
}
.st-spec-table td { color: var(--st-gray-800); }

/* ── Qualification strip ───────────────────────────────────────────────────── */
.st-qualification {
  background: var(--st-blue-50);
  border-top: 2px solid var(--st-blue-500);
  border-bottom: 1px solid var(--st-blue-300);
  padding-block: var(--st-space-5);
}
.st-qualification__inner { display: flex; gap: var(--st-space-6); align-items: flex-start; flex-wrap: wrap; }
.st-qualification__label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--st-blue-700);
  white-space: nowrap;
  padding-top: 4px;
  min-width: 120px;
}
.st-qualification__grid {
  flex: 1;
  display: flex;
  flex-wrap: wrap;
  gap: var(--st-space-5);
}
.st-qual-item { min-width: 160px; }
.st-qual-item__heading {
  display: block;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--st-gray-600);
  margin-bottom: var(--st-space-1);
}
.st-qual-item__value {
  font-size: 0.875rem;
  color: var(--st-gray-800);
}
.st-qual-item__links { display: flex; flex-direction: column; gap: var(--st-space-2); }
.st-doc-link {
  display: inline-flex;
  align-items: center;
  gap: var(--st-space-2);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--st-blue-700);
  text-decoration: none;
}
.st-doc-link:hover { color: var(--st-blue-900); text-decoration: underline; }
.st-doc-link__icon { flex-shrink: 0; }

/* ── Quick Answer box ──────────────────────────────────────────────────────── */
.st-quick-answer {
  background: var(--st-white);
  border-left: 4px solid var(--st-blue-500);
  padding-block: var(--st-space-4);
}
.st-quick-answer__inner { display: flex; gap: var(--st-space-4); align-items: flex-start; }
.st-quick-answer__label {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--st-blue-500);
  white-space: nowrap;
  min-width: 100px;
  padding-top: 3px;
}
.st-quick-answer__text {
  font-size: 1rem;
  color: var(--st-gray-800);
  line-height: 1.6;
}

/* ── Available-as tag ──────────────────────────────────────────────────────── */
.st-section--available-as { padding-block: var(--st-space-6); background: var(--st-off-white); }
.st-available-as { display: flex; align-items: center; flex-wrap: wrap; gap: var(--st-space-4); }
.st-available-as__label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--st-gray-600);
}
.st-available-as__tags { display: flex; flex-wrap: wrap; gap: var(--st-space-2); }
.st-tag { display: inline-block; padding: 0.375rem 0.75rem; font-size: 0.8125rem; font-weight: 600; }
.st-tag--engagement {
  background: var(--st-white);
  border: 1px solid var(--st-blue-500);
  color: var(--st-blue-700);
  text-decoration: none;
}
.st-tag--engagement:hover {
  background: var(--st-blue-500);
  color: var(--st-white);
  text-decoration: none;
}
.st-available-as__note { font-size: 0.875rem; color: var(--st-gray-600); }
.st-available-as__cta-note { font-size: 0.875rem; }

/* ── Proof / Layer 2 block ─────────────────────────────────────────────────── */
.st-section--proof { background: var(--st-off-white); padding-block: var(--st-space-6); }
.st-proof-block { border-left: 4px solid var(--st-blue-500); padding-left: var(--st-space-5); }
.st-proof-block__text { font-size: 1rem; color: var(--st-gray-800); font-style: italic; margin-bottom: var(--st-space-2); }
.st-proof-block__note { font-size: 0.8125rem; color: var(--st-gray-600); }

/* ── Cross-brand link ──────────────────────────────────────────────────────── */
.st-section--brand-link { padding-block: var(--st-space-5); background: var(--st-off-white); }
.st-brand-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--st-space-5);
  padding: var(--st-space-4) var(--st-space-5);
  border: 1px solid var(--st-gray-300);
  background: var(--st-white);
}
.st-brand-link__inner { display: flex; flex-direction: column; gap: var(--st-space-1); }
.st-brand-link__name  { font-weight: 600; font-size: 0.9375rem; color: var(--st-gray-800); }
.st-brand-link__context { font-size: 0.875rem; color: var(--st-gray-600); }

/* ── Related content panel ─────────────────────────────────────────────────── */
.st-section--related { padding-block: var(--st-space-7); }
.st-related__heading {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--st-space-5);
  padding-bottom: var(--st-space-3);
  border-bottom: 2px solid var(--st-blue-500);
}
.st-related__list { display: flex; flex-direction: column; gap: var(--st-space-3); }
.st-related__link { font-weight: 600; color: var(--st-blue-700); }
.st-related__link:hover { color: var(--st-blue-900); }
.st-related__excerpt { font-size: 0.875rem; color: var(--st-gray-600); margin-top: 2px; }

/* ── Case references ───────────────────────────────────────────────────────── */
.st-section--references { background: var(--st-off-white); padding-block: var(--st-space-8); }
.st-reference-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: var(--st-space-4); margin-top: var(--st-space-5); }
.st-reference-card { border: 1px solid var(--st-gray-300); background: var(--st-white); }
.st-reference-card__body { padding: var(--st-space-5); }
.st-reference-card__title { font-size: 1rem; font-weight: 600; margin-bottom: var(--st-space-3); }
.st-reference-card__title a { color: var(--st-gray-800); }
.st-reference-card__title a:hover { color: var(--st-blue-700); }
.st-reference-card__excerpt { font-size: 0.875rem; color: var(--st-gray-600); margin-bottom: var(--st-space-3); }
.st-reference-card__link { font-size: 0.875rem; font-weight: 600; color: var(--st-blue-700); }

/* ── Contact CTA band ──────────────────────────────────────────────────────── */
.st-contact-cta {
  background: var(--st-blue-900);
  padding-block: var(--st-space-8);
}
.st-contact-cta__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--st-space-6);
  flex-wrap: wrap;
}
.st-contact-cta__heading {
  font-size: clamp(1.25rem, 2.5vw, 1.625rem);
  color: var(--st-white);
  margin-bottom: var(--st-space-2);
}
.st-contact-cta__sub { font-size: 0.9375rem; color: var(--st-blue-300); }
.st-contact-cta__actions { display: flex; flex-direction: column; gap: var(--st-space-3); align-items: flex-start; }
.st-contact-cta__direct-link { font-size: 0.875rem; color: var(--st-blue-300); }
.st-contact-cta__direct-link:hover { color: var(--st-white); text-decoration: none; }

/* ── OEM Disclaimer ────────────────────────────────────────────────────────── */
.st-oem-disclaimer {
  background: #FFF9E6;
  border: 1px solid #E5C300;
  padding: var(--st-space-4);
  margin-block: var(--st-space-4);
}
.st-oem-disclaimer__inner { display: flex; gap: var(--st-space-3); align-items: flex-start; }
.st-oem-disclaimer__icon { flex-shrink: 0; color: #A07800; margin-top: 3px; }
.st-oem-disclaimer__text { font-size: 0.875rem; color: #434343; line-height: 1.55; }

/* ── Callout boxes ─────────────────────────────────────────────────────────── */
.st-callout {
  border-left: 4px solid var(--st-blue-500);
  background: var(--st-blue-50);
  padding: var(--st-space-4) var(--st-space-5);
}
.st-callout--scope {
  border-color: var(--st-gray-600);
  background: var(--st-off-white);
}

/* ── Card grid ─────────────────────────────────────────────────────────────── */
.st-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--st-space-4);
}
.st-card-grid--3col { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
.st-card-grid--2col { grid-template-columns: repeat(auto-fill, minmax(400px, 1fr)); }
.st-card-grid--industries { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: var(--st-space-2); }

.st-card {
  border: 1px solid var(--st-gray-300);
  background: var(--st-white);
  display: flex;
  flex-direction: column;
}
.st-card__image img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
.st-card__body {
  padding: var(--st-space-5);
  flex: 1;
  display: flex;
  flex-direction: column;
}
.st-card__title { font-size: 1.0625rem; font-weight: 600; margin-bottom: var(--st-space-3); }
.st-card__title a { color: var(--st-gray-800); }
.st-card__title a:hover { color: var(--st-blue-700); text-decoration: none; }
.st-card__excerpt { font-size: 0.875rem; color: var(--st-gray-600); flex: 1; margin-bottom: var(--st-space-4); }
.st-card__spec { font-size: 0.875rem; color: var(--st-gray-600); margin-bottom: var(--st-space-3); }
.st-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--st-space-3);
  border-top: 1px solid var(--st-gray-300);
  margin-top: auto;
}
.st-card__count { font-size: 0.8125rem; color: var(--st-gray-600); }
.st-card__link { font-size: 0.875rem; font-weight: 600; color: var(--st-blue-700); }
.st-card__actions { display: flex; gap: var(--st-space-2); flex-wrap: wrap; margin-top: auto; padding-top: var(--st-space-3); }

/* ── Industry cards (homepage) ─────────────────────────────────────────────── */
.st-industry-card {
  display: flex;
  flex-direction: column;
  padding: var(--st-space-4);
  border: 1px solid var(--st-gray-300);
  background: var(--st-white);
  color: var(--st-gray-800);
  text-decoration: none;
  transition: border-color var(--st-transition), background var(--st-transition);
}
.st-industry-card:hover {
  border-color: var(--st-blue-500);
  background: var(--st-blue-50);
  text-decoration: none;
  color: var(--st-gray-800);
}
.st-industry-card__title { font-weight: 600; font-size: 0.9375rem; margin-bottom: var(--st-space-1); }
.st-industry-card__excerpt { font-size: 0.8125rem; color: var(--st-gray-600); flex: 1; }
.st-industry-card__arrow { font-size: 1rem; color: var(--st-blue-500); margin-top: var(--st-space-2); }

/* ── Entity strip (homepage) ───────────────────────────────────────────────── */
.st-entity-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--st-space-4);
}
@media (max-width: 860px) {
  .st-entity-strip { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .st-entity-strip { grid-template-columns: 1fr; }
}
.st-entity-card {
  padding: var(--st-space-5);
  border: 1px solid rgba(255,255,255,0.15);
  background: rgba(255,255,255,0.06);
}
.st-entity-card__link {
  display: block;
  color: inherit;
  text-decoration: none;
}
.st-entity-card__link:hover .st-entity-card__name { color: var(--st-blue-300); }
.st-entity-card__name {
  display: block;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--st-white);
  margin-bottom: 2px;
}
.st-entity-card__role {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--st-blue-300);
  margin-bottom: var(--st-space-3);
}
.st-entity-card__desc { font-size: 0.875rem; color: rgba(255,255,255,0.7); line-height: 1.55; }

/* ── Engagement spectrum ───────────────────────────────────────────────────── */
.st-engage-spectrum {
  display: flex;
  overflow-x: auto;
  gap: 0;
  border: 1px solid var(--st-gray-300);
  margin-block: var(--st-space-5);
}
.st-engage-item {
  flex: 1;
  min-width: 140px;
  padding: var(--st-space-4);
  border-right: 1px solid var(--st-gray-300);
  background: var(--st-white);
}
.st-engage-item:last-child { border-right: 0; }
.st-engage-item__name { display: block; font-weight: 600; font-size: 0.9375rem; color: var(--st-gray-800); margin-bottom: var(--st-space-2); }
.st-engage-item__desc { font-size: 0.8125rem; color: var(--st-gray-600); }

/* ── Prose (rich text content from editor) ─────────────────────────────────── */
.st-prose h2 { font-size: 1.5rem; margin-top: 2.5rem; margin-bottom: 1rem; }
.st-prose h3 { font-size: 1.25rem; margin-top: 2rem; margin-bottom: 0.75rem; }
.st-prose p  { margin-bottom: 1.25rem; }
.st-prose ul,
.st-prose ol { padding-left: 1.5rem; margin-bottom: 1.25rem; }
.st-prose ul { list-style: disc; }
.st-prose ol { list-style: decimal; }
.st-prose li { margin-bottom: 0.5rem; }
.st-prose a  { color: var(--st-blue-700); }
.st-prose a:hover { color: var(--st-blue-900); }
.st-prose strong { font-weight: 600; }
.st-prose em { font-style: italic; }
.st-prose table {
  width: 100%; border-collapse: collapse; margin-bottom: 1.5rem;
  font-size: 0.9375rem;
}
.st-prose table th {
  background: var(--st-blue-900); color: var(--st-white);
  padding: 0.6rem 0.75rem; text-align: left; font-weight: 600; font-size: 0.875rem;
}
.st-prose table td {
  padding: 0.55rem 0.75rem; border-bottom: 1px solid var(--st-gray-300);
}
.st-prose table tr:nth-child(even) td { background: var(--st-off-white); }

/* ── List grid (applications, search) ─────────────────────────────────────── */
.st-list-grid { display: flex; flex-direction: column; gap: var(--st-space-4); }
.st-list-item { border-bottom: 1px solid var(--st-gray-300); padding-bottom: var(--st-space-4); }
.st-list-item__title { font-size: 1.0625rem; font-weight: 600; margin-bottom: var(--st-space-2); }
.st-list-item__title a { color: var(--st-gray-800); }
.st-list-item__title a:hover { color: var(--st-blue-700); }
.st-list-item__excerpt { font-size: 0.9375rem; color: var(--st-gray-600); margin-bottom: var(--st-space-2); }
.st-list-item__link { font-size: 0.875rem; font-weight: 600; color: var(--st-blue-700); }

/* ── Application category sections ────────────────────────────────────────── */
.st-app-category { margin-bottom: var(--st-space-7); }
.st-app-category__header { margin-bottom: var(--st-space-4); }
.st-app-category__title { font-size: 1.25rem; margin-bottom: var(--st-space-2); }
.st-app-category__title a { color: var(--st-gray-800); }
.st-app-category__desc { font-size: 0.9375rem; color: var(--st-gray-600); }
.st-app-category__list { columns: 2; gap: var(--st-space-4); }
.st-app-category__list li { break-inside: avoid; margin-bottom: var(--st-space-2); font-size: 0.9375rem; }
.st-app-category__list a { color: var(--st-blue-700); }

/* ── Breadcrumb ────────────────────────────────────────────────────────────── */
.st-breadcrumb {
  background: var(--st-white);
  border-bottom: 1px solid var(--st-gray-300);
  padding-block: var(--st-space-3);
}
.st-breadcrumb--funnel { background: var(--st-blue-900); border-bottom: 1px solid var(--st-blue-700); }
.st-breadcrumb--funnel a { color: var(--st-blue-300); }
.st-breadcrumb__list { display: flex; flex-wrap: wrap; gap: var(--st-space-2); align-items: center; font-size: 0.8125rem; }
.st-breadcrumb__item { display: flex; align-items: center; gap: var(--st-space-2); color: var(--st-gray-600); }
.st-breadcrumb__item::after { content: '/'; color: var(--st-gray-300); }
.st-breadcrumb__item:last-child::after { display: none; }
.st-breadcrumb__item--current { color: var(--st-gray-800); font-weight: 600; }
.st-breadcrumb__link { color: var(--st-gray-600); text-decoration: none; }
.st-breadcrumb__link:hover { color: var(--st-blue-700); text-decoration: underline; }

/* ── Section label / section-level eyebrow ─────────────────────────────────── */
.st-section__label {
  display: block;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--st-blue-500);
  margin-bottom: var(--st-space-3);
}

/* ── Project references list ───────────────────────────────────────────────── */
.st-references { display: flex; flex-direction: column; gap: var(--st-space-3); margin-top: var(--st-space-4); }
.st-reference-item {
  display: flex;
  gap: var(--st-space-3);
  align-items: flex-start;
  font-size: 0.9375rem;
  color: var(--st-gray-800);
  padding: var(--st-space-3) var(--st-space-4);
  border-left: 3px solid var(--st-blue-300);
  background: var(--st-white);
}
.st-reference-item__bullet {
  width: 8px; height: 8px; min-width: 8px;
  background: var(--st-blue-500);
  margin-top: 7px;
}

/* ── Canonical link callout ────────────────────────────────────────────────── */
.st-section--canonical-link { padding-block: var(--st-space-5); }
.st-canonical-callout { border: 1px dashed var(--st-gray-300); padding: var(--st-space-4); text-align: center; }
.st-canonical-callout p { font-size: 0.875rem; color: var(--st-gray-600); margin-bottom: var(--st-space-3); }

/* ── Hero highlight ────────────────────────────────────────────────────────── */
.st-hero__highlight { color: var(--st-blue-300); font-style: normal; }

/* ── Search form ────────────────────────────────────────────────────────────── */
.st-search-form { display: flex; gap: var(--st-space-3); margin-top: var(--st-space-5); max-width: 560px; }
.st-search-form__input {
  flex: 1;
  padding: 0.75rem 1rem;
  border: 2px solid var(--st-gray-300);
  font-family: var(--st-font-sans);
  font-size: 1rem;
  outline: none;
}
.st-search-form__input:focus { border-color: var(--st-blue-500); }

/* ── Article tag strip ─────────────────────────────────────────────────────── */
.st-article__tags { padding-block: var(--st-space-5); }
.st-tag-strip { display: flex; flex-wrap: wrap; gap: var(--st-space-2); }
.st-tag--article {
  background: var(--st-white);
  border: 1px solid var(--st-gray-300);
  color: var(--st-gray-600);
  font-size: 0.8125rem;
  font-weight: 400;
  text-decoration: none;
  padding: 0.25rem 0.625rem;
}
.st-tag--article:hover {
  border-color: var(--st-blue-500);
  color: var(--st-blue-700);
  text-decoration: none;
}

/* ── Responsive utilities ──────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .st-section { padding-block: var(--st-space-7); }
  .st-hero { padding-block: var(--st-space-6); }
  .st-contact-cta__inner { flex-direction: column; align-items: flex-start; }
  .st-brand-link { flex-direction: column; }
  .st-available-as { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .st-container { padding-inline: var(--st-space-4); }
  .st-card-grid,
  .st-card-grid--3col,
  .st-card-grid--2col { grid-template-columns: 1fr; }
}

/* ── Card polish (flat, industrial — no shadows, sharp corners) ─────────────── */
/* Image cards: subtle zoom on hover within a clipped frame. */
.st-card__image { overflow: hidden; }
.st-card__image img {
  transition: transform 400ms ease;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}
.st-card { transition: border-color var(--st-transition); }
.st-card:hover { border-color: var(--st-blue-500); }
.st-card:hover .st-card__image img { transform: scale(1.045); }

/* Text-only hub cards (product family / equipment category): top accent rail. */
.st-card--family,
.st-card--category {
  position: relative;
  border-top: 3px solid var(--st-blue-500);
}
.st-card--family .st-card__body,
.st-card--category .st-card__body { padding-top: var(--st-space-5); }
.st-card--family:hover,
.st-card--category:hover { background: var(--st-blue-50); }

/* Hub card count chip — small engineered tag. */
.st-card__count {
  display: inline-block;
  padding: 2px 8px;
  background: var(--st-gray-100);
  border: 1px solid var(--st-gray-300);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--st-gray-600);
}

/* Insight cards: eyebrow label sits tighter to the title. */
.st-card--insight .st-eyebrow { color: var(--st-blue-500); }

/* Industry cards: stronger hover affordance + arrow nudge. */
.st-industry-card { transition: border-color var(--st-transition), background var(--st-transition); }
.st-industry-card__arrow { transition: transform var(--st-transition); }
.st-industry-card:hover .st-industry-card__arrow { transform: translateX(4px); }

/* ═══════════════════════════════════════════════════════════════════════════
   PREMIUM INDUSTRIAL LAYER — V8.3 refresh
   Blue + depth & accents · elevated image cards · refined heroes.
   This block intentionally overrides the earlier flat rules above.
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Buttons: subtle depth + gradient primary ──────────────────────────────── */
.st-btn { border-radius: var(--st-radius); letter-spacing: .005em; }
.st-btn--primary {
  background: linear-gradient(180deg, var(--st-blue-500) 0%, var(--st-blue-700) 100%);
  border-color: var(--st-blue-700);
  box-shadow: 0 4px 12px rgba(47,102,196,.30);
}
.st-btn--primary:hover {
  background: linear-gradient(180deg, var(--st-blue-700) 0%, var(--st-blue-900) 100%);
  box-shadow: 0 8px 20px rgba(47,102,196,.40);
  transform: translateY(-1px);
}
.st-btn--lg { padding: 1.05rem 2.1rem; }

/* ── Section rhythm + headers ──────────────────────────────────────────────── */
.st-section__title {
  font-size: clamp(1.6rem, 2.6vw, 2.1rem);
  letter-spacing: -0.01em;
}
.st-section__label,
.st-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.st-section__label::before {
  content: "";
  width: 22px; height: 2px;
  background: var(--st-blue-500);
  display: inline-block;
}

/* ── Premium card (shared across products/systems/industries/related/insights) ─ */
.st-card {
  background: var(--st-white);
  border: 1px solid var(--st-gray-300);
  border-radius: var(--st-radius-lg);
  overflow: hidden;
  box-shadow: var(--st-shadow-sm);
  transition: transform .38s cubic-bezier(.2,.7,.2,1), box-shadow .38s ease, border-color .38s ease;
}
.st-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--st-shadow-lg);
  border-color: var(--st-blue-300);
}
.st-card__image {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--st-blue-900);
}
.st-card__image::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(16,34,72,0) 45%, rgba(16,34,72,.55) 100%);
  pointer-events: none;
}
.st-card__image img {
  width: 100%; height: 100%;
  object-fit: cover;
  aspect-ratio: auto;
  transition: transform .7s cubic-bezier(.2,.7,.2,1);
}
.st-card:hover .st-card__image img { transform: scale(1.07); }

/* Category / type chip floated on the image */
.st-card__chip {
  position: absolute; left: 14px; top: 14px; z-index: 2;
  display: inline-flex; align-items: center; gap: 6px;
  background: rgba(255,255,255,.92);
  color: var(--st-blue-700);
  font-size: .6875rem; font-weight: 600;
  letter-spacing: .06em; text-transform: uppercase;
  padding: 5px 11px; border-radius: var(--st-radius-pill);
  box-shadow: 0 2px 8px rgba(16,42,90,.18);
  backdrop-filter: blur(6px);
}

.st-card__body { padding: 22px 22px 24px; gap: 0; }
.st-card__title { font-size: 1.15rem; line-height: 1.3; margin-bottom: 10px; }
.st-card__title a { color: var(--st-gray-800); transition: color var(--st-transition); }
.st-card:hover .st-card__title a { color: var(--st-blue-700); }
.st-card__excerpt { font-size: .9rem; line-height: 1.6; color: var(--st-gray-600); }

/* Animated arrow link */
.st-card__link {
  display: inline-flex; align-items: center; gap: 6px;
  font-weight: 600; color: var(--st-blue-700);
}
.st-card__link::after { content: "→"; transition: transform var(--st-transition); }
.st-card:hover .st-card__link::after { transform: translateX(5px); }
.st-card__footer { border-top: 1px solid var(--st-gray-100); }

/* Card grid: larger, breathing gaps */
.st-card-grid { gap: var(--st-space-5); }
.st-card-grid--3col { gap: var(--st-space-5); }

/* ── Hub cards (product family / equipment category): premium text card ──────── */
.st-card--family,
.st-card--category {
  border-top: none;
  position: relative;
  padding-top: 6px;
  background:
    linear-gradient(var(--st-white), var(--st-white)) padding-box,
    linear-gradient(180deg, var(--st-blue-500), var(--st-blue-900)) border-box;
  border: 1px solid transparent;
}
.st-card--family::before,
.st-card--category::before {
  content: "";
  position: absolute; left: 0; right: 0; top: 0; height: 4px;
  background: linear-gradient(90deg, var(--st-blue-500), var(--st-blue-300));
  border-radius: var(--st-radius-lg) var(--st-radius-lg) 0 0;
}
.st-card--family:hover,
.st-card--category:hover { background: var(--st-blue-50); }
.st-card--family .st-card__body,
.st-card--category .st-card__body { padding-top: var(--st-space-6); }
.st-card__count {
  border-radius: var(--st-radius-pill);
  background: var(--st-blue-50);
  border-color: var(--st-blue-300);
  color: var(--st-blue-700);
}

/* ── Entity hero: refined, with depth + optional product image ──────────────── */
.st-hero--entity {
  background:
    radial-gradient(1200px 400px at 100% -20%, rgba(74,134,232,.10), transparent 60%),
    linear-gradient(180deg, var(--st-off-white), #fff);
  border-bottom: 1px solid var(--st-gray-300);
  position: relative;
  padding-block: var(--st-space-8);
}
.st-hero--entity::after {
  content: "";
  position: absolute; left: 0; right: 0; bottom: 0; height: 4px;
  background: linear-gradient(90deg, var(--st-blue-700), var(--st-blue-500) 40%, var(--st-blue-300));
}
.st-hero--entity .st-container { position: relative; }

/* Two-column entity hero: text + framed product image */
.st-hero__grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: var(--st-space-8);
  align-items: center;
}
@media (max-width: 920px) { .st-hero__grid { grid-template-columns: 1fr; } }
.st-hero__media {
  border-radius: var(--st-radius-lg);
  overflow: hidden;
  box-shadow: var(--st-shadow-lg);
  aspect-ratio: 4 / 3;
  background: var(--st-blue-900);
}
.st-hero__media img { width: 100%; height: 100%; object-fit: cover; }
.st-eyebrow__chip {
  display: inline-block;
  background: var(--st-blue-50);
  border: 1px solid var(--st-blue-300);
  color: var(--st-blue-700);
  padding: 4px 12px; border-radius: var(--st-radius-pill);
  font-size: .72rem; font-weight: 600; letter-spacing: .06em; text-transform: uppercase;
}
.st-hero__title { letter-spacing: -0.015em; }

/* ── Quick Answer: premium callout ─────────────────────────────────────────── */
.st-quick-answer {
  border-left: none;
  background: transparent;
  padding-block: var(--st-space-6);
}
.st-quick-answer__inner {
  position: relative;
  background: linear-gradient(135deg, var(--st-blue-900), var(--st-blue-700));
  color: #fff;
  border-radius: var(--st-radius-lg);
  padding: var(--st-space-6) var(--st-space-7);
  box-shadow: var(--st-shadow-md);
  gap: var(--st-space-5);
  overflow: hidden;
}
.st-quick-answer__inner::before {
  content: "";
  position: absolute; right: -60px; top: -60px;
  width: 220px; height: 220px; border-radius: 50%;
  background: radial-gradient(circle, rgba(136,170,239,.25), transparent 70%);
}
.st-quick-answer__label {
  color: var(--st-blue-300);
  min-width: 110px;
  font-size: .72rem;
}
.st-quick-answer__label::before {
  content: "✦ ";
}
.st-quick-answer__text { color: rgba(255,255,255,.94); font-size: 1.05rem; line-height: 1.65; }

/* ── Qualification strip: credential chips ─────────────────────────────────── */
.st-qualification {
  background: linear-gradient(180deg, #fff, var(--st-off-white));
  border-top: 1px solid var(--st-gray-300);
  border-bottom: 1px solid var(--st-gray-300);
  padding-block: var(--st-space-6);
}
.st-qualification__grid { gap: var(--st-space-4); }
.st-qual-item {
  background: #fff;
  border: 1px solid var(--st-gray-300);
  border-radius: var(--st-radius);
  padding: 14px 16px;
  box-shadow: var(--st-shadow-sm);
  min-width: 180px;
}
.st-qual-item__heading { color: var(--st-blue-700); }
.st-doc-link {
  background: var(--st-blue-50);
  border: 1px solid var(--st-blue-300);
  border-radius: var(--st-radius);
  padding: 7px 12px;
}
.st-doc-link:hover { background: var(--st-blue-500); color: #fff; }
.st-doc-link:hover .st-doc-link__icon path { fill: #fff; }

/* ── Spec card: datasheet styling ──────────────────────────────────────────── */
.st-spec-card {
  border: 1px solid var(--st-gray-300);
  border-radius: var(--st-radius-lg);
  box-shadow: var(--st-shadow-md);
  padding: 0;
  overflow: hidden;
}
.st-spec-card__title {
  margin: 0; padding: 16px 20px;
  background: linear-gradient(135deg, var(--st-blue-900), var(--st-blue-700));
  color: #fff; border-bottom: none;
  font-size: .95rem; letter-spacing: .02em;
}
.st-spec-table { padding: 0; }
.st-spec-table th, .st-spec-table td { padding: 11px 20px; }
.st-spec-table tr:nth-child(even) th,
.st-spec-table tr:nth-child(even) td { background: var(--st-off-white); }
.st-spec-table th { background: transparent; color: var(--st-gray-600); font-weight: 600; }
.st-spec-table td { font-weight: 600; color: var(--st-gray-800); }

/* ── Available-as: pill tags ───────────────────────────────────────────────── */
.st-section--available-as { background: transparent; }
.st-available-as {
  background: var(--st-off-white);
  border: 1px solid var(--st-gray-300);
  border-radius: var(--st-radius-lg);
  padding: var(--st-space-5) var(--st-space-6);
}
.st-tag--engagement {
  border-radius: var(--st-radius-pill);
  padding: 8px 16px;
  box-shadow: var(--st-shadow-sm);
  transition: transform var(--st-transition), box-shadow var(--st-transition);
}
.st-tag--engagement:hover { transform: translateY(-2px); box-shadow: var(--st-shadow-md); }

/* ── Related content: rich image cards ─────────────────────────────────────── */
.st-section--related { padding-block: var(--st-space-8); }
.st-related__heading {
  border-bottom: none;
  display: flex; align-items: center; gap: 10px;
  font-size: 1.4rem;
  margin-bottom: var(--st-space-6);
}
.st-related__heading::before {
  content: ""; width: 28px; height: 3px;
  background: linear-gradient(90deg, var(--st-blue-500), var(--st-blue-300));
  border-radius: 2px;
}
.st-related__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--st-space-5);
}

/* ── Proof / Layer-2 block: premium quote ──────────────────────────────────── */
.st-section--proof { background: transparent; }
.st-proof-block {
  border-left: none;
  background: linear-gradient(135deg, var(--st-blue-50), #fff);
  border: 1px solid var(--st-blue-300);
  border-radius: var(--st-radius-lg);
  padding: var(--st-space-6) var(--st-space-7);
  box-shadow: var(--st-shadow-sm);
  position: relative;
}
.st-proof-block::before {
  content: "“";
  position: absolute; left: 18px; top: -10px;
  font-size: 4rem; line-height: 1; color: var(--st-blue-300);
  font-family: Georgia, serif;
}
.st-proof-block__text { font-size: 1.1rem; padding-left: var(--st-space-5); }

/* ── Cross-brand link: elevated ────────────────────────────────────────────── */
.st-brand-link {
  border-radius: var(--st-radius-lg);
  box-shadow: var(--st-shadow-sm);
  border: 1px solid var(--st-gray-300);
  padding: var(--st-space-5) var(--st-space-6);
  transition: box-shadow var(--st-transition), transform var(--st-transition);
}
.st-brand-link:hover { box-shadow: var(--st-shadow-md); transform: translateY(-2px); }

/* ── Case references: image cards ──────────────────────────────────────────── */
.st-reference-card {
  border: 1px solid var(--st-gray-300);
  border-radius: var(--st-radius-lg);
  box-shadow: var(--st-shadow-sm);
  overflow: hidden;
  transition: transform .35s cubic-bezier(.2,.7,.2,1), box-shadow .35s;
}
.st-reference-card:hover { transform: translateY(-5px); box-shadow: var(--st-shadow-lg); }

/* ── Contact CTA: premium gradient band ────────────────────────────────────── */
.st-contact-cta {
  background:
    radial-gradient(800px 300px at 0% 0%, rgba(74,134,232,.25), transparent 60%),
    linear-gradient(135deg, var(--st-blue-900), #163a78);
  border-radius: var(--st-radius-lg);
  margin: var(--st-space-8) auto;
  max-width: var(--st-container-max);
  position: relative;
  overflow: hidden;
}
.st-contact-cta > .st-container { position: relative; z-index: 1; }
.st-contact-cta__heading { font-size: clamp(1.4rem, 2.6vw, 1.9rem); letter-spacing: -0.01em; }

/* ── Breadcrumb: lighter, refined ──────────────────────────────────────────── */
.st-breadcrumb { background: var(--st-off-white); }

/* ── Hub hero: depth ───────────────────────────────────────────────────────── */
.st-hero--hub {
  background:
    radial-gradient(900px 360px at 90% -30%, rgba(136,170,239,.28), transparent 60%),
    linear-gradient(135deg, var(--st-blue-900), var(--st-blue-700));
  position: relative;
}
.st-hero--hub::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 4px;
  background: linear-gradient(90deg, var(--st-blue-300), var(--st-blue-500));
}

/* Card image as a link (related cards) + no-thumbnail placeholder */
a.st-card__image { display: block; text-decoration: none; }
a.st-card__image:hover { text-decoration: none; }
.st-card__placeholder {
  position: absolute; inset: 0; z-index: 1;
  display: flex; align-items: center; justify-content: center;
  font-size: 4rem; font-weight: 600; color: rgba(255,255,255,.85);
  background:
    radial-gradient(420px 200px at 70% 20%, rgba(136,170,239,.45), transparent 60%),
    linear-gradient(135deg, var(--st-blue-900), var(--st-blue-700));
  font-family: var(--st-font-sans);
}

/* ── Responsive ────────────────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .st-quick-answer__inner { flex-direction: column; padding: var(--st-space-5); }
  .st-contact-cta { border-radius: 0; margin-inline: 0; }
}