/* =============================================================
   Braden Filtration — Single stylesheet
   Mobile-first. Token-driven. No build step.
   ============================================================= */

/* ---------- 1. Design tokens ---------- */
:root {
  /* Color — cool industrial palette only */
  --c-ink: #041120;
  --c-ink-subtle: #1F2937;
  --c-navy: #274C77;
  --c-navy-2: #1d3a5d;
  --c-steel: #3297B9;
  --c-steel-deep: #228099;
  --c-steel-mid: #6096BA;
  --c-steel-light: #A3CEF1;
  --c-powder: #B3DAE9;
  --c-cyan: #9FE4FB;
  --c-bg: #F5F9FC;
  --c-bg-alt: #EDF2F4;
  --c-white: #FFFFFF;
  --c-hairline: #E7ECEF;
  --c-hairline-strong: #D6DCE0;

  /* Type */
  --font-display: "Roboto Slab", Georgia, serif;
  --font-ui: "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  /* Fluid type scale */
  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-md: 1.125rem;
  --fs-lg: clamp(1.25rem, 1.1rem + 0.5vw, 1.5rem);
  --fs-xl: clamp(1.5rem, 1.3rem + 1vw, 2rem);
  --fs-2xl: clamp(1.875rem, 1.5rem + 1.5vw, 2.625rem);
  --fs-3xl: clamp(2.25rem, 1.7rem + 2.5vw, 3.5rem);
  --fs-4xl: clamp(2.75rem, 2rem + 3.5vw, 4.5rem);

  /* Spacing */
  --s-1: 0.25rem;
  --s-2: 0.5rem;
  --s-3: 0.75rem;
  --s-4: 1rem;
  --s-5: 1.25rem;
  --s-6: 1.5rem;
  --s-8: 2rem;
  --s-10: 2.5rem;
  --s-12: 3rem;
  --s-16: 4rem;
  --s-20: 5rem;
  --s-24: 6rem;
  --s-32: 8rem;

  /* Layout */
  --container-max: 1280px;
  --container-pad: clamp(1rem, 3vw, 2rem);
  --section-y: clamp(3rem, 8vw, 6rem);
  --section-y-lg: clamp(4rem, 10vw, 8rem);

  /* Radii */
  --r-sm: 4px;
  --r-md: 8px;
  --r-lg: 14px;
  --r-xl: 24px;

  /* Shadows */
  --sh-sm: 0 1px 2px rgba(4, 17, 32, 0.06), 0 1px 1px rgba(4, 17, 32, 0.04);
  --sh-md: 0 4px 12px rgba(4, 17, 32, 0.08), 0 2px 4px rgba(4, 17, 32, 0.04);
  --sh-lg: 0 12px 32px rgba(4, 17, 32, 0.12), 0 4px 8px rgba(4, 17, 32, 0.06);
  --sh-card-hover: 0 16px 40px rgba(39, 76, 119, 0.18), 0 0 0 1px rgba(50, 151, 185, 0.15);

  /* Motion */
  --t-fast: 150ms;
  --t-base: 250ms;
  --t-slow: 400ms;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);

  /* Z layers */
  --z-header: 100;
  --z-overlay: 200;
  --z-modal: 300;
}

/* ---------- 2. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}
body {
  margin: 0;
  font-family: var(--font-ui);
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--c-ink);
  background: var(--c-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, svg, video { display: block; max-width: 100%; height: auto; }
img { object-fit: cover; }
button { font: inherit; cursor: pointer; border: 0; background: transparent; color: inherit; }
a { color: var(--c-steel-deep); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--c-navy); }
input, textarea, select { font: inherit; color: inherit; }
ul, ol { padding-left: 1.25rem; margin: 0 0 var(--s-4); }
li { margin-bottom: var(--s-2); }
h1, h2, h3, h4, h5, h6 { margin: 0 0 var(--s-4); font-weight: 600; line-height: 1.15; color: var(--c-ink); letter-spacing: -0.01em; }
p { margin: 0 0 var(--s-4); }
p:last-child { margin-bottom: 0; }

/* ---------- 3. Typography ---------- */
h1, .h1 { font-family: var(--font-display); font-size: var(--fs-3xl); font-weight: 700; letter-spacing: -0.02em; }
h2, .h2 { font-family: var(--font-display); font-size: var(--fs-2xl); font-weight: 600; letter-spacing: -0.015em; }
h3, .h3 { font-family: var(--font-display); font-size: var(--fs-xl); font-weight: 600; }
h4, .h4 { font-family: var(--font-ui); font-size: var(--fs-lg); font-weight: 600; }
.eyebrow {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-steel-deep);
  margin-bottom: var(--s-3);
}
.eyebrow--on-dark { color: var(--c-steel-light); }
.lede {
  font-size: var(--fs-md);
  color: var(--c-ink-subtle);
  max-width: 60ch;
}
.lede--on-dark { color: var(--c-powder); }
.text-on-dark { color: var(--c-white); }
.text-muted { color: var(--c-ink-subtle); }

/* ---------- 4. Skip link & a11y ---------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  padding: var(--s-3) var(--s-4);
  background: var(--c-ink);
  color: var(--c-white);
  z-index: 1000;
  border-radius: 0 0 var(--r-md) 0;
}
.skip-link:focus { left: 0; outline: 3px solid var(--c-cyan); outline-offset: 2px; }
:focus-visible {
  outline: 3px solid var(--c-steel);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}
.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;
}

/* ---------- 5. Layout primitives ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}
.container--narrow { max-width: 960px; }
.container--wide { max-width: 1440px; }

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--bg { background: var(--c-bg); }
.section--bg-alt { background: var(--c-bg-alt); }
.section--ink {
  background: var(--c-ink);
  background-image:
    radial-gradient(ellipse at 15% 30%, rgba(50, 151, 185, 0.18), transparent 60%),
    radial-gradient(ellipse at 85% 70%, rgba(39, 76, 119, 0.45), transparent 55%),
    linear-gradient(180deg, var(--c-ink), var(--c-navy-2));
  color: var(--c-white);
}
.section--ink h1, .section--ink h2, .section--ink h3, .section--ink h4 { color: var(--c-white); }
.section--navy {
  background: var(--c-navy);
  color: var(--c-white);
}
.section--navy h1, .section--navy h2, .section--navy h3 { color: var(--c-white); }

.grid { display: grid; gap: var(--s-6); }
.grid--2 { grid-template-columns: 1fr; }
.grid--3 { grid-template-columns: 1fr; }
.grid--4 { grid-template-columns: 1fr; }
.grid--5 { grid-template-columns: repeat(2, 1fr); }
@media (min-width: 600px) {
  .grid--2 { grid-template-columns: repeat(2, 1fr); }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 900px) {
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
  .grid--4 { grid-template-columns: repeat(3, 1fr); }
  .grid--5 { grid-template-columns: repeat(5, 1fr); }
}
@media (min-width: 1100px) {
  .grid--4 { grid-template-columns: repeat(4, 1fr); }
}
.two-col {
  display: grid;
  gap: var(--s-10);
  grid-template-columns: 1fr;
  align-items: center;
}
@media (min-width: 900px) {
  .two-col { grid-template-columns: 1fr 1fr; gap: var(--s-16); }
  .two-col--swap > :first-child { order: 2; }
  .two-col--60-40 { grid-template-columns: 6fr 4fr; }
  .two-col--40-60 { grid-template-columns: 4fr 6fr; }
}

.divider-hairline { height: 1px; background: var(--c-hairline); border: 0; margin-block: var(--s-8); }
.divider-on-dark { background: rgba(255,255,255,0.12); }

/* ---------- 6. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-2);
  padding: 0.875rem 1.5rem;
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: var(--fs-base);
  line-height: 1;
  border-radius: var(--r-md);
  text-decoration: none;
  transition: transform var(--t-fast) var(--ease),
              background var(--t-fast) var(--ease),
              color var(--t-fast) var(--ease),
              box-shadow var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease);
  white-space: nowrap;
  border: 1px solid transparent;
  letter-spacing: 0.01em;
  min-height: 48px;
}
.btn:focus-visible { outline-offset: 3px; }

.btn--primary {
  background: var(--c-steel);
  color: var(--c-white);
  box-shadow: 0 1px 0 rgba(255,255,255,0.15) inset, var(--sh-sm);
}
.btn--primary:hover {
  background: var(--c-steel-deep);
  color: var(--c-white);
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(50, 151, 185, 0.3);
}
.btn--ghost {
  background: transparent;
  color: var(--c-white);
  border-color: rgba(255,255,255,0.4);
}
.btn--ghost:hover {
  border-color: var(--c-white);
  background: rgba(255,255,255,0.06);
  color: var(--c-white);
  transform: translateY(-1px);
}
.btn--ghost-dark {
  background: transparent;
  color: var(--c-navy);
  border-color: var(--c-navy);
}
.btn--ghost-dark:hover {
  background: var(--c-navy);
  color: var(--c-white);
  transform: translateY(-1px);
}
.btn--sm { padding: 0.625rem 1rem; font-size: var(--fs-sm); min-height: 40px; }
.btn--lg { padding: 1.125rem 2rem; font-size: var(--fs-md); }
.btn .icon-arrow { transition: transform var(--t-fast) var(--ease); }
.btn:hover .icon-arrow { transform: translateX(3px); }

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 600;
  color: var(--c-steel-deep);
  text-decoration: none;
  position: relative;
}
.text-link::after {
  content: "";
  position: absolute;
  bottom: -2px; left: 0; right: 0;
  height: 1px;
  background: currentColor;
  transform-origin: left;
  transform: scaleX(0.4);
  transition: transform var(--t-base) var(--ease);
}
.text-link:hover::after { transform: scaleX(1); }
.text-link .icon-arrow { transition: transform var(--t-base) var(--ease); }
.text-link:hover .icon-arrow { transform: translateX(4px); }
.text-link--on-dark { color: var(--c-cyan); }
.text-link--on-dark:hover { color: var(--c-white); }

/* ---------- 7. Utility bar ---------- */
.utility {
  background: var(--c-ink);
  color: var(--c-powder);
  font-size: var(--fs-sm);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.utility__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-4);
  min-height: 38px;
  padding-block: 0.4rem;
  flex-wrap: wrap;
}
.utility__contact {
  display: flex;
  gap: var(--s-5);
  align-items: center;
  flex-wrap: wrap;
}
.utility a {
  color: var(--c-powder);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding-block: 0.2rem;
  min-height: 32px;
}
.utility a:hover { color: var(--c-white); }
.utility__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.7rem;
  background: rgba(50, 151, 185, 0.18);
  color: var(--c-cyan);
  border: 1px solid rgba(50, 151, 185, 0.35);
  border-radius: 999px;
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
@media (max-width: 700px) {
  .utility__badge { display: none; }
}

/* ---------- 8. Header ---------- */
.header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--c-hairline);
  transition: background var(--t-base) var(--ease), border-color var(--t-base) var(--ease);
}
.header--scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: var(--sh-sm);
}
.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-6);
  min-height: 72px;
}
.header__logo {
  display: inline-flex;
  align-items: center;
  gap: var(--s-3);
  text-decoration: none;
  color: var(--c-ink);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-md);
  letter-spacing: 0.01em;
}
.header__logo:hover { color: var(--c-navy); }
.header__logo-mark {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--c-steel);
}
.header__logo-text { line-height: 1; }
.header__logo-text small {
  display: block;
  font-family: var(--font-ui);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-steel-deep);
  margin-top: 2px;
}

.nav { display: none; }
@media (min-width: 980px) {
  .nav {
    display: flex;
    align-items: center;
    gap: var(--s-2);
  }
}
.nav__link {
  position: relative;
  padding: 0.75rem 0.9rem;
  font-weight: 500;
  font-size: var(--fs-sm);
  color: var(--c-ink-subtle);
  text-decoration: none;
  border-radius: var(--r-sm);
  transition: color var(--t-fast) var(--ease);
}
.nav__link:hover, .nav__link[aria-current="page"] {
  color: var(--c-navy);
}
.nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0.9rem; right: 0.9rem; bottom: 4px;
  height: 2px;
  background: var(--c-steel);
}
.header__cta { display: none; }
@media (min-width: 980px) {
  .header__cta { display: inline-flex; }
}

/* Mobile menu toggle */
.menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px; height: 48px;
  border-radius: var(--r-md);
  color: var(--c-ink);
}
@media (min-width: 980px) {
  .menu-toggle { display: none; }
}
.menu-toggle:hover { background: var(--c-bg-alt); }

/* Mobile menu overlay */
.mobile-menu {
  position: fixed;
  inset: 0;
  background: var(--c-ink);
  background-image:
    radial-gradient(ellipse at top right, rgba(50,151,185,0.2), transparent 60%),
    linear-gradient(180deg, var(--c-ink), var(--c-navy-2));
  color: var(--c-white);
  z-index: var(--z-overlay);
  display: flex;
  flex-direction: column;
  transform: translateY(-100%);
  transition: transform var(--t-base) var(--ease);
  overflow-y: auto;
}
.mobile-menu[data-open="true"] { transform: translateY(0); }
.mobile-menu__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--s-4) var(--container-pad);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.mobile-menu__close {
  color: var(--c-white);
  width: 48px; height: 48px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: var(--r-md);
}
.mobile-menu__close:hover { background: rgba(255,255,255,0.08); }
.mobile-menu__nav {
  flex: 1;
  padding: var(--s-6) var(--container-pad);
  display: flex; flex-direction: column;
  gap: var(--s-1);
}
.mobile-menu__nav a {
  display: block;
  padding: var(--s-4) 0;
  color: var(--c-white);
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.mobile-menu__nav a:hover { color: var(--c-cyan); }
.mobile-menu__foot {
  padding: var(--s-6) var(--container-pad) var(--s-8);
  display: flex; flex-direction: column; gap: var(--s-3);
  border-top: 1px solid rgba(255,255,255,0.08);
  background: rgba(0,0,0,0.2);
}
.mobile-menu__foot a {
  color: var(--c-powder);
  text-decoration: none;
  display: inline-flex; gap: var(--s-2); align-items: center;
}

/* ---------- 9. Hero ---------- */
.hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  color: var(--c-white);
  background: var(--c-ink);
  background-image:
    radial-gradient(ellipse at 10% 20%, rgba(50,151,185,0.22), transparent 55%),
    radial-gradient(ellipse at 90% 80%, rgba(39,76,119,0.55), transparent 55%),
    linear-gradient(180deg, var(--c-ink) 0%, #07182b 100%);
}
.hero__inner {
  position: relative;
  display: grid;
  gap: var(--s-10);
  grid-template-columns: 1fr;
  align-items: center;
  padding-block: clamp(4rem, 12vw, 7rem);
  z-index: 2;
}
@media (min-width: 980px) {
  .hero__inner { grid-template-columns: 6fr 5fr; gap: var(--s-16); }
}
.hero__copy { max-width: 36rem; }
.hero__copy h1 { color: var(--c-white); margin-bottom: var(--s-5); }
.hero__copy .lede { color: var(--c-powder); margin-bottom: var(--s-8); font-size: var(--fs-md); }
.hero__ctas { display: flex; gap: var(--s-3); flex-wrap: wrap; }
.hero__visual {
  position: relative;
  aspect-ratio: 5 / 4;
  border-radius: var(--r-lg);
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(50,151,185,0.25), transparent 60%),
    radial-gradient(ellipse at 30% 30%, rgba(163,206,241,0.2), transparent 60%),
    linear-gradient(180deg, var(--c-navy-2), var(--c-ink));
  box-shadow: var(--sh-lg), inset 0 0 0 1px rgba(255,255,255,0.06);
}
.hero__visual img, .hero__visual video {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
}
.hero__visual::after {
  /* hairline grid texture */
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
  mix-blend-mode: overlay;
}
.hero--compact .hero__inner { padding-block: clamp(3rem, 9vw, 5rem); }
.hero--center .hero__copy { max-width: 48rem; margin: 0 auto; text-align: center; }
.hero--center .hero__ctas { justify-content: center; }

/* Hero global grain overlay */
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 80px 80px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse at center, black, transparent 80%);
  z-index: 1;
}

/* ---------- 10. Trust strip ---------- */
.trust-strip {
  background: var(--c-white);
  border-block: 1px solid var(--c-hairline);
}
.trust-strip__list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  list-style: none;
  padding: 0;
  margin: 0;
}
@media (min-width: 720px) {
  .trust-strip__list { grid-template-columns: repeat(4, 1fr); }
}
.trust-strip__item {
  padding: var(--s-6) var(--s-4);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--s-2);
  border-right: 1px solid var(--c-hairline);
  margin: 0;
}
.trust-strip__item:last-child { border-right: 0; }
@media (max-width: 719px) {
  .trust-strip__item:nth-child(2n) { border-right: 0; }
  .trust-strip__item:nth-child(-n+2) { border-bottom: 1px solid var(--c-hairline); }
}
.trust-strip__num {
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--c-navy);
  line-height: 1;
}
.trust-strip__label {
  font-size: var(--fs-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-ink-subtle);
  font-weight: 600;
}

/* ---------- 11. Cards ---------- */
.card {
  position: relative;
  background: var(--c-white);
  border: 1px solid var(--c-hairline);
  border-radius: var(--r-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease), border-color var(--t-base) var(--ease);
}
@media (hover: hover) {
  .card:hover {
    transform: translateY(-4px);
    box-shadow: var(--sh-card-hover);
    border-color: var(--c-steel-light);
  }
}
.card__media {
  aspect-ratio: 3 / 2;
  background:
    linear-gradient(135deg, var(--c-steel-light) 0%, var(--c-powder) 100%);
  overflow: hidden;
  position: relative;
}
.card__media img { width: 100%; height: 100%; object-fit: cover; }
.card__media--square { aspect-ratio: 1 / 1; }
.card__body {
  padding: var(--s-6);
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  flex: 1;
}
.card__title {
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: 600;
  color: var(--c-ink);
  margin: 0;
}
.card__desc { color: var(--c-ink-subtle); font-size: var(--fs-sm); margin: 0; }
.card__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: var(--s-3);
  border-top: 1px solid var(--c-hairline);
}
.card__cta {
  display: inline-flex; align-items: center; gap: 0.3rem;
  color: var(--c-steel-deep);
  font-weight: 600; font-size: var(--fs-sm);
  text-decoration: none;
}
.card a.card__link {
  position: absolute; inset: 0; z-index: 2;
  font-size: 0; color: transparent;
  text-indent: -9999px;
}

/* Application / category card variant */
.app-card { padding-bottom: 0; }
.app-card .card__body { padding: var(--s-6) var(--s-6) var(--s-6); }

/* Product card — unified across all 11 */
.product-card .card__media--square::before {
  /* fallback icon when no real image */
  content: "";
  position: absolute; inset: 50% 50% auto auto;
  width: 80px; height: 80px;
  background:
    radial-gradient(circle, var(--c-steel) 2px, transparent 2.5px) 0 0 / 12px 12px,
    radial-gradient(circle, var(--c-steel) 2px, transparent 2.5px) 6px 6px / 12px 12px;
  transform: translate(50%, -50%);
  opacity: 0.35;
}
.product-card .card__media img { position: relative; z-index: 1; }
.product-card .card__body { gap: var(--s-2); padding: var(--s-5); }
.product-card .card__chips {
  display: flex; gap: var(--s-2); flex-wrap: wrap;
  margin-top: var(--s-2);
}
.chip {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.625rem;
  background: var(--c-bg-alt);
  color: var(--c-navy);
  border-radius: 999px;
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.04em;
}
.chip--steel { background: rgba(50,151,185,0.12); color: var(--c-steel-deep); }
.chip--navy { background: var(--c-navy); color: var(--c-white); }
.chip--outline { background: transparent; border: 1px solid var(--c-hairline-strong); color: var(--c-ink-subtle); }
.chip--made-usa {
  background: rgba(50,151,185,0.18);
  color: var(--c-cyan);
  border: 1px solid rgba(50,151,185,0.35);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* Pillar / icon card */
.pillar {
  padding: var(--s-6);
  background: var(--c-white);
  border: 1px solid var(--c-hairline);
  border-radius: var(--r-lg);
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  transition: border-color var(--t-base) var(--ease), transform var(--t-base) var(--ease);
}
@media (hover: hover) {
  .pillar:hover { border-color: var(--c-steel-light); transform: translateY(-2px); }
}
.pillar__icon {
  width: 48px; height: 48px;
  background: linear-gradient(135deg, var(--c-steel-light), var(--c-powder));
  color: var(--c-navy);
  border-radius: var(--r-md);
  display: inline-flex; align-items: center; justify-content: center;
  margin-bottom: var(--s-2);
}
.pillar h4 { margin: 0; font-family: var(--font-display); font-size: var(--fs-lg); }
.pillar p { color: var(--c-ink-subtle); font-size: var(--fs-sm); margin: 0; }

/* ---------- 12. Specs table ---------- */
.specs {
  background: var(--c-ink);
  background-image:
    radial-gradient(ellipse at 80% 20%, rgba(50,151,185,0.15), transparent 60%),
    linear-gradient(180deg, var(--c-ink), var(--c-navy-2));
  color: var(--c-white);
  border-radius: var(--r-lg);
  padding: var(--s-8);
}
@media (min-width: 720px) { .specs { padding: var(--s-10); } }
.specs h3 { color: var(--c-white); }
.specs__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}
@media (min-width: 720px) {
  .specs__list { grid-template-columns: repeat(2, 1fr); column-gap: var(--s-10); }
}
.specs__list li {
  display: grid;
  grid-template-columns: 1fr;
  padding: var(--s-4) 0;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  margin: 0;
}
@media (min-width: 720px) {
  .specs__list li { grid-template-columns: 11rem 1fr; gap: var(--s-4); align-items: baseline; }
}
.specs__label {
  font-size: var(--fs-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-cyan);
  font-weight: 600;
}
.specs__value { color: var(--c-white); font-size: var(--fs-md); }

/* ---------- 13. Accordion (FAQ) ---------- */
.accordion { display: flex; flex-direction: column; gap: var(--s-3); }
.accordion details {
  background: var(--c-white);
  border: 1px solid var(--c-hairline);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: border-color var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease);
}
.accordion details[open] {
  border-color: var(--c-steel-light);
  box-shadow: var(--sh-sm);
}
.accordion summary {
  list-style: none;
  cursor: pointer;
  padding: var(--s-5) var(--s-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-4);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-md);
  color: var(--c-ink);
  user-select: none;
}
.accordion summary::-webkit-details-marker { display: none; }
.accordion summary::after {
  content: "";
  flex: 0 0 auto;
  width: 14px; height: 14px;
  border-right: 2px solid var(--c-steel-deep);
  border-bottom: 2px solid var(--c-steel-deep);
  transform: rotate(45deg);
  transition: transform var(--t-base) var(--ease);
  margin-bottom: 4px;
}
.accordion details[open] summary::after { transform: rotate(-135deg); margin-bottom: 0; margin-top: 4px; }
.accordion details > div {
  padding: 0 var(--s-6) var(--s-6);
  color: var(--c-ink-subtle);
}
.accordion details > div p:last-child { margin-bottom: 0; }
.accordion__group { margin-bottom: var(--s-10); }
.accordion__group:last-child { margin-bottom: 0; }
.accordion__group-title {
  font-family: var(--font-ui);
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-steel-deep);
  margin-bottom: var(--s-4);
}

/* ---------- 14. OEM wall (typographic) ---------- */
.oem-wall {
  background: var(--c-bg-alt);
  border-radius: var(--r-lg);
  padding: var(--s-10) var(--s-8);
  text-align: center;
}
.oem-wall__eyebrow {
  font-size: var(--fs-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-steel-deep);
  font-weight: 700;
  margin-bottom: var(--s-3);
}
.oem-wall__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--s-3) var(--s-6);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-lg);
  color: var(--c-navy);
}
.oem-wall__list li {
  margin: 0;
  position: relative;
  padding: 0 0 0 var(--s-6);
}
.oem-wall__list li:first-child { padding-left: 0; }
.oem-wall__list li:not(:first-child)::before {
  content: "";
  position: absolute;
  left: 0; top: 50%;
  width: 4px; height: 4px;
  background: var(--c-steel);
  border-radius: 50%;
  transform: translateY(-50%);
}

/* ---------- 15. Compliance bar ---------- */
.compliance {
  background: linear-gradient(135deg, var(--c-navy) 0%, var(--c-ink) 100%);
  color: var(--c-white);
  padding: var(--s-8);
  border-radius: var(--r-lg);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-4);
  align-items: center;
}
@media (min-width: 900px) {
  .compliance { grid-template-columns: 1fr 2fr; gap: var(--s-10); padding: var(--s-10); }
}
.compliance h3 { color: var(--c-white); margin: 0; }
.compliance p { color: var(--c-powder); margin: 0; font-size: var(--fs-sm); }

/* ---------- 16. CTA band ---------- */
.cta-band {
  background: var(--c-ink);
  background-image:
    radial-gradient(ellipse at 20% 50%, rgba(50,151,185,0.25), transparent 60%),
    radial-gradient(ellipse at 80% 50%, rgba(39,76,119,0.55), transparent 60%),
    linear-gradient(180deg, var(--c-ink), var(--c-navy-2));
  color: var(--c-white);
  padding-block: clamp(3rem, 8vw, 5rem);
  position: relative;
  overflow: hidden;
}
.cta-band::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at center, black, transparent 75%);
  pointer-events: none;
}
.cta-band__inner {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--s-6);
  align-items: flex-start;
}
@media (min-width: 900px) {
  .cta-band__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: var(--s-10);
  }
}
.cta-band h2 { color: var(--c-white); margin: 0; max-width: 32ch; }
.cta-band p { color: var(--c-powder); margin: var(--s-2) 0 0; max-width: 50ch; }
.cta-band__actions { display: flex; gap: var(--s-3); flex-wrap: wrap; flex-shrink: 0; }

/* ---------- 17. Form ---------- */
.form { display: flex; flex-direction: column; gap: var(--s-5); }
.field { display: flex; flex-direction: column; gap: var(--s-2); }
.field--row { display: grid; gap: var(--s-5); grid-template-columns: 1fr; }
@media (min-width: 720px) { .field--row { grid-template-columns: 1fr 1fr; } }
.field label {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--c-ink);
}
.field .required { color: var(--c-steel-deep); }
.field .hint { font-size: var(--fs-xs); color: var(--c-ink-subtle); }
.field input,
.field textarea,
.field select {
  width: 100%;
  padding: 0.875rem 1rem;
  background: var(--c-white);
  color: var(--c-ink);
  border: 1px solid var(--c-hairline-strong);
  border-radius: var(--r-md);
  font-size: var(--fs-base);
  transition: border-color var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
  min-height: 48px;
}
.field textarea { min-height: 140px; resize: vertical; }
.field input:focus,
.field textarea:focus,
.field select:focus {
  outline: none;
  border-color: var(--c-steel);
  box-shadow: 0 0 0 3px rgba(50,151,185,0.18);
}
.field--honeypot {
  position: absolute; left: -9999px; top: -9999px;
  width: 1px; height: 1px; overflow: hidden;
}
.form__status {
  padding: var(--s-4);
  border-radius: var(--r-md);
  font-size: var(--fs-sm);
  display: none;
}
.form__status[data-state="loading"] { display: block; background: var(--c-bg-alt); color: var(--c-ink-subtle); }
.form__status[data-state="success"] { display: block; background: rgba(50,151,185,0.1); color: var(--c-steel-deep); border: 1px solid rgba(50,151,185,0.3); }
.form__status[data-state="error"] { display: block; background: #FDECEC; color: #8B1F1F; border: 1px solid #F5C2C2; }

/* Contact info side panel */
.contact-panel {
  background: var(--c-ink);
  background-image:
    radial-gradient(ellipse at top right, rgba(50,151,185,0.2), transparent 60%),
    linear-gradient(180deg, var(--c-ink), var(--c-navy-2));
  color: var(--c-white);
  padding: var(--s-8);
  border-radius: var(--r-lg);
  display: flex;
  flex-direction: column;
  gap: var(--s-6);
}
.contact-panel h3 { color: var(--c-white); margin: 0; }
.contact-panel .contact-row {
  display: flex; gap: var(--s-3); align-items: flex-start;
}
.contact-panel .contact-row .icon {
  flex: 0 0 24px; color: var(--c-cyan); margin-top: 2px;
}
.contact-panel .contact-row a, .contact-panel .contact-row span {
  color: var(--c-white); text-decoration: none; line-height: 1.4;
}
.contact-panel .contact-row a:hover { color: var(--c-cyan); }
.contact-panel .contact-row .label {
  display: block; font-size: var(--fs-xs); letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--c-cyan); margin-bottom: 0.15rem; font-weight: 600;
}
.contact-panel .placeholder {
  font-size: var(--fs-xs);
  color: var(--c-powder);
  font-style: italic;
  opacity: 0.7;
}

/* ---------- 18. Media textures grid (gas turbine) ---------- */
.media-grid {
  display: grid;
  grid-template-columns: 1fr;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--c-hairline);
  gap: 1px;
}
@media (min-width: 600px) { .media-grid { grid-template-columns: repeat(2, 1fr); } }
.media-grid__cell {
  background: linear-gradient(135deg, var(--c-bg) 0%, var(--c-bg-alt) 100%);
  padding: var(--s-6);
  aspect-ratio: 1 / 1;
  display: flex; flex-direction: column; justify-content: space-between;
  gap: var(--s-3);
  position: relative;
  overflow: hidden;
}
.media-grid__cell::before {
  /* texture pattern fallback */
  content: "";
  position: absolute; inset: 0;
  background-image: repeating-linear-gradient(
    45deg,
    rgba(50,151,185,0.08) 0,
    rgba(50,151,185,0.08) 2px,
    transparent 2px,
    transparent 6px
  );
  opacity: 0.6;
  pointer-events: none;
}
.media-grid__cell h4 { margin: 0; position: relative; z-index: 1; }
.media-grid__cell ul {
  list-style: none; padding: 0; margin: 0;
  font-size: var(--fs-sm); color: var(--c-ink-subtle);
  display: flex; flex-direction: column; gap: var(--s-1);
  position: relative; z-index: 1;
}
.media-grid__cell ul li::before { content: "› "; color: var(--c-steel-deep); font-weight: 700; }

/* ---------- 19. Footer ---------- */
.footer {
  background: var(--c-ink);
  background-image: linear-gradient(180deg, var(--c-navy-2) 0%, var(--c-ink) 100%);
  color: var(--c-powder);
  padding-block: var(--s-16) var(--s-8);
  margin-top: var(--s-16);
}
.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-8);
}
@media (min-width: 600px) {
  .footer__grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 900px) {
  .footer__grid { grid-template-columns: 2fr 1fr 1fr 1fr; }
}
.footer__brand .header__logo-text { color: var(--c-white); }
.footer__brand .header__logo-text small { color: var(--c-cyan); }
.footer__brand p { color: var(--c-powder); font-size: var(--fs-sm); margin-top: var(--s-4); max-width: 32ch; }
.footer h5 {
  color: var(--c-white);
  font-family: var(--font-ui);
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: var(--s-4);
}
.footer ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: var(--s-2); }
.footer a { color: var(--c-powder); text-decoration: none; font-size: var(--fs-sm); }
.footer a:hover { color: var(--c-white); }
.footer__social { display: flex; gap: var(--s-2); margin-top: var(--s-4); }
.footer__social a {
  width: 40px; height: 40px;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--r-md);
}
.footer__social a:hover { background: rgba(50,151,185,0.18); border-color: var(--c-cyan); color: var(--c-cyan); }
.footer__legal {
  margin-top: var(--s-10);
  padding-top: var(--s-6);
  border-top: 1px solid rgba(255,255,255,0.08);
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  align-items: flex-start;
  justify-content: space-between;
  font-size: var(--fs-xs);
  color: rgba(255,255,255,0.5);
}
@media (min-width: 720px) {
  .footer__legal { flex-direction: row; align-items: center; }
}
.made-usa-pill {
  display: inline-flex; align-items: center; gap: var(--s-2);
  padding: 0.4rem 0.8rem;
  background: rgba(50,151,185,0.15);
  color: var(--c-cyan);
  border: 1px solid rgba(50,151,185,0.3);
  border-radius: var(--r-sm);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ---------- 20. Scroll reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 600ms var(--ease), transform 600ms var(--ease);
  will-change: opacity, transform;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}
.reveal--delay-1 { transition-delay: 80ms; }
.reveal--delay-2 { transition-delay: 160ms; }
.reveal--delay-3 { transition-delay: 240ms; }
.reveal--delay-4 { transition-delay: 320ms; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- 21. Page headers (inner pages) ---------- */
.page-hero {
  position: relative;
  background: var(--c-ink);
  background-image:
    radial-gradient(ellipse at 80% 20%, rgba(50,151,185,0.22), transparent 60%),
    linear-gradient(180deg, var(--c-ink), var(--c-navy-2));
  color: var(--c-white);
  padding-block: clamp(4rem, 10vw, 6rem);
  overflow: hidden;
  isolation: isolate;
}
.page-hero::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at center, black, transparent 75%);
  pointer-events: none;
}
.page-hero__visual {
  position: absolute; inset: 0;
  z-index: -1;
  opacity: 0.25;
}
.page-hero__visual img { width: 100%; height: 100%; object-fit: cover; }
.page-hero__inner { position: relative; z-index: 1; max-width: 56rem; }
.page-hero h1 { color: var(--c-white); margin-bottom: var(--s-4); }
.page-hero p { color: var(--c-powder); font-size: var(--fs-md); max-width: 50rem; }
.breadcrumbs {
  font-size: var(--fs-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-cyan);
  margin-bottom: var(--s-4);
  font-weight: 600;
}
.breadcrumbs a { color: var(--c-cyan); text-decoration: none; }
.breadcrumbs a:hover { color: var(--c-white); }
.breadcrumbs span { margin-inline: 0.5rem; opacity: 0.5; }

/* ---------- 22. Section header ---------- */
.section-head { max-width: 56rem; margin-bottom: var(--s-10); }
.section-head--center { margin-inline: auto; text-align: center; }
.section-head h2 { margin-bottom: var(--s-3); }
.section-head p { color: var(--c-ink-subtle); font-size: var(--fs-md); max-width: 50rem; }
.section-head--center p { margin-inline: auto; }

/* ---------- 23. Logo SVG sizing helpers ---------- */
.icon-arrow { display: inline-block; width: 16px; height: 16px; flex: 0 0 16px; }
.icon { display: inline-flex; }

/* ---------- 24. 404 ---------- */
.error-page {
  min-height: 60vh;
  display: flex; align-items: center; justify-content: center;
  text-align: center;
  padding-block: var(--s-16);
}
.error-page__code {
  font-family: var(--font-display);
  font-size: clamp(4rem, 16vw, 10rem);
  font-weight: 700;
  line-height: 1;
  color: var(--c-steel-light);
  margin-bottom: var(--s-4);
}

/* ============================================================
   POLISH LAYER — Premium upgrades (appended)
   ============================================================ */

/* ---------- P1. Decorative engineered elements ---------- */
.eng-corner {
  position: absolute;
  width: 24px; height: 24px;
  pointer-events: none;
  color: var(--c-cyan);
  opacity: 0.7;
}
.eng-corner--tl { top: 16px; left: 16px; border-top: 1px solid currentColor; border-left: 1px solid currentColor; }
.eng-corner--tr { top: 16px; right: 16px; border-top: 1px solid currentColor; border-right: 1px solid currentColor; }
.eng-corner--bl { bottom: 16px; left: 16px; border-bottom: 1px solid currentColor; border-left: 1px solid currentColor; }
.eng-corner--br { bottom: 16px; right: 16px; border-bottom: 1px solid currentColor; border-right: 1px solid currentColor; }

.eng-tick {
  display: inline-block;
  width: 20px; height: 1px;
  background: var(--c-steel);
  vertical-align: middle;
  margin-right: 8px;
}
.eng-tick--lg { width: 40px; }

.eng-label {
  font-family: var(--font-ui);
  font-size: 0.6875rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-steel-deep);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.eng-label--on-dark { color: var(--c-cyan); }
.eng-label::before {
  content: "";
  width: 24px; height: 1px;
  background: currentColor;
  opacity: 0.8;
}

/* ---------- P2. Animated grid background pattern ---------- */
.bg-grid {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(rgba(50,151,185,0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(50,151,185,0.08) 1px, transparent 1px);
  background-size: 56px 56px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}
.bg-grid--dark {
  background-image:
    linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);
}
.bg-grid--dense { background-size: 28px 28px; }
.bg-dots {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image: radial-gradient(circle, rgba(50,151,185,0.18) 1px, transparent 1.5px);
  background-size: 24px 24px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse at center, black 20%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 20%, transparent 75%);
}

/* Animated scan-line that sweeps the hero once on load */
@keyframes scanSweep {
  0%   { transform: translateY(-100%); opacity: 0; }
  10%  { opacity: 1; }
  100% { transform: translateY(120vh); opacity: 0; }
}
.scan-line {
  position: absolute;
  left: 0; right: 0;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-cyan), transparent);
  opacity: 0;
  z-index: 2;
  pointer-events: none;
  animation: scanSweep 3.8s var(--ease) 0.6s 1 both;
}
@media (prefers-reduced-motion: reduce) { .scan-line { display: none; } }

/* ---------- P3. Premium hero rebuild ---------- */
.hero { padding-bottom: 0; }
.hero__inner { padding-block: clamp(4.5rem, 13vw, 8rem); }

.hero__copy h1 {
  font-size: clamp(2.5rem, 1.9rem + 3vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
}
.hero__copy h1 .accent {
  background: linear-gradient(135deg, var(--c-cyan) 0%, var(--c-steel-light) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero__copy .lede { font-size: clamp(1rem, 0.95rem + 0.3vw, 1.1875rem); line-height: 1.55; }

.hero__visual {
  position: relative;
  aspect-ratio: 4 / 5;
  background:
    radial-gradient(ellipse at 30% 20%, rgba(159,228,251,0.25), transparent 60%),
    linear-gradient(140deg, var(--c-navy-2) 0%, var(--c-ink) 70%);
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow:
    0 30px 60px rgba(4,17,32,0.55),
    0 0 0 1px rgba(159,228,251,0.12),
    inset 0 0 0 1px rgba(255,255,255,0.04);
  transform-origin: center;
  will-change: transform;
}
.hero__visual::after {
  background-image:
    linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse at center, transparent 30%, black 90%);
  -webkit-mask-image: radial-gradient(ellipse at center, transparent 30%, black 90%);
}
.hero__visual img {
  object-fit: cover;
  filter: brightness(0.85) contrast(1.05) saturate(0.85);
  mix-blend-mode: normal;
}

.hero__overlay-tag {
  position: absolute;
  z-index: 3;
  padding: 0.7rem 0.95rem;
  background: rgba(7, 24, 43, 0.78);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(159,228,251,0.25);
  border-radius: var(--r-md);
  color: var(--c-white);
  font-size: var(--fs-xs);
  display: flex;
  align-items: center;
  gap: 0.55rem;
  box-shadow: 0 8px 18px rgba(4,17,32,0.35);
}
.hero__overlay-tag .dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--c-cyan);
  box-shadow: 0 0 10px var(--c-cyan);
  animation: pulse 2s ease-in-out infinite;
}
.hero__overlay-tag--tl { top: 24px; left: 24px; }
.hero__overlay-tag--br { bottom: 24px; right: 24px; }

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.5; transform: scale(0.8); }
}
@media (prefers-reduced-motion: reduce) {
  .hero__overlay-tag .dot { animation: none; }
}

.hero__spec-row {
  position: absolute;
  left: 16px; right: 16px;
  bottom: 16px;
  z-index: 3;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  background: rgba(4, 17, 32, 0.78);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(159,228,251,0.18);
  border-radius: var(--r-md);
  overflow: hidden;
}
.hero__spec-row > div {
  padding: 0.85rem 0.6rem;
  text-align: center;
  border-right: 1px solid rgba(159,228,251,0.12);
}
.hero__spec-row > div:last-child { border-right: 0; }
.hero__spec-row .v {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-md);
  color: var(--c-white);
  line-height: 1;
}
.hero__spec-row .l {
  display: block;
  font-size: 0.6rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-cyan);
  font-weight: 600;
  margin-top: 0.4rem;
}

/* Hero CTAs — premium polish */
.btn--primary {
  background: linear-gradient(180deg, var(--c-steel) 0%, var(--c-steel-deep) 100%);
  box-shadow:
    0 1px 0 rgba(255,255,255,0.25) inset,
    0 0 0 1px rgba(50,151,185,0.4),
    0 8px 16px rgba(50,151,185,0.25),
    0 2px 4px rgba(4,17,32,0.18);
  position: relative;
  overflow: hidden;
}
.btn--primary::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(255,255,255,0.18) 50%, transparent 70%);
  transform: translateX(-110%);
  transition: transform 700ms var(--ease);
  pointer-events: none;
}
.btn--primary:hover::before { transform: translateX(110%); }
.btn--primary:hover {
  box-shadow:
    0 1px 0 rgba(255,255,255,0.3) inset,
    0 0 0 1px rgba(50,151,185,0.6),
    0 12px 24px rgba(50,151,185,0.35),
    0 4px 8px rgba(4,17,32,0.25);
}

/* ---------- P4. Stat block w/ count-up support ---------- */
.stat-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--c-hairline);
  border: 1px solid var(--c-hairline);
  border-radius: var(--r-lg);
  overflow: hidden;
}
@media (min-width: 720px) { .stat-row { grid-template-columns: repeat(4, 1fr); } }
.stat-row__cell {
  background: var(--c-white);
  padding: clamp(1.25rem, 2.5vw, 2rem);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  position: relative;
}
.stat-row__cell::before {
  /* small engineered tick */
  content: "";
  width: 32px; height: 2px;
  background: var(--c-steel);
  border-radius: 999px;
  margin-bottom: 0.5rem;
}
.stat-row__num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 1.5rem + 2vw, 3rem);
  color: var(--c-navy);
  line-height: 1;
  letter-spacing: -0.02em;
}
.stat-row__num .suffix {
  font-size: 0.7em;
  color: var(--c-steel-deep);
}
.stat-row__label {
  font-size: var(--fs-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-ink-subtle);
  font-weight: 600;
}

/* ---------- P5. Premium card with image + light sweep ---------- */
.card {
  background: var(--c-white);
  box-shadow: var(--sh-sm);
}
.card__media {
  background: linear-gradient(140deg, #DDE7EE 0%, #F0F5F9 100%);
  position: relative;
  overflow: hidden;
}
.card__media::before {
  /* subtle product-shot vignette */
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 50% 35%, transparent 35%, rgba(4,17,32,0.08) 100%);
  pointer-events: none;
  z-index: 2;
}
.card__media img {
  object-fit: cover;
  transition: transform 700ms var(--ease);
  z-index: 1;
  position: relative;
}
@media (hover: hover) {
  .card:hover .card__media img { transform: scale(1.04); }
}
.card__media-overlay {
  position: absolute;
  z-index: 3;
  bottom: 12px; left: 12px;
  padding: 0.3rem 0.6rem;
  background: rgba(7, 24, 43, 0.78);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  color: var(--c-white);
  font-size: 0.65rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: 600;
  border-radius: var(--r-sm);
  border: 1px solid rgba(159,228,251,0.2);
}

/* Card "light sweep" on hover */
.card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 35%, rgba(159,228,251,0.08) 50%, transparent 65%);
  transform: translateX(-110%);
  transition: transform 800ms var(--ease);
  pointer-events: none;
  z-index: 3;
}
@media (hover: hover) {
  .card:hover::after { transform: translateX(110%); }
}

/* Product card — refined for real photography */
.product-card .card__media {
  background: linear-gradient(140deg, #E8EEF3 0%, #F5F9FC 100%);
}
.product-card .card__media::before { opacity: 0.6; }
.product-card .card__media img {
  object-fit: contain;
  padding: 12%;
  background: transparent;
}
.product-card .card__body {
  padding: var(--s-5);
  gap: var(--s-3);
}
.product-card .card__title {
  font-size: var(--fs-md);
  line-height: 1.2;
}

/* ---------- P6. Application card — image on top w/ overlay label ---------- */
.app-card .card__media { aspect-ratio: 4 / 3; }
.app-card .card__media img {
  filter: brightness(0.92) contrast(1.06) saturate(0.9);
}
.app-card .card__media::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 50%;
  background: linear-gradient(180deg, transparent 0%, rgba(4,17,32,0.7) 100%);
  z-index: 2;
}
.app-card .card__media-label {
  position: absolute;
  z-index: 3;
  left: 16px; bottom: 16px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-cyan);
  font-weight: 700;
}
.app-card .card__media-label::before {
  content: "";
  width: 28px; height: 1px;
  background: currentColor;
}

/* Data Center card fallback art (CSS-only) */
.app-card--datacenter .card__media {
  background:
    repeating-linear-gradient(180deg, transparent 0 18px, rgba(159,228,251,0.18) 18px 19px, transparent 19px 36px),
    radial-gradient(ellipse at 50% 80%, rgba(50,151,185,0.4), transparent 60%),
    linear-gradient(180deg, var(--c-navy-2) 0%, var(--c-ink) 100%);
}
.app-card--datacenter .card__media::before {
  background:
    radial-gradient(circle at 50% 40%, rgba(159,228,251,0.5) 1.5px, transparent 2px) 0 0 / 24px 24px;
  opacity: 0.4;
}
.app-card--datacenter .card__media::after {
  background: linear-gradient(180deg, transparent 0%, rgba(4,17,32,0.85) 100%);
}

/* HVAC card uses real Braden flat-panel photo */
.app-card--hvac .card__media img { object-fit: cover; }

/* ---------- P7. Pillar w/ accent stripe ---------- */
.pillar {
  position: relative;
  background: var(--c-white);
  overflow: hidden;
}
.pillar::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--c-steel), var(--c-cyan));
  opacity: 0.6;
  transition: opacity var(--t-base) var(--ease), width var(--t-base) var(--ease);
}
@media (hover: hover) {
  .pillar:hover::before { opacity: 1; width: 4px; }
}
.pillar__icon {
  background: linear-gradient(135deg, var(--c-cyan) 0%, var(--c-steel-light) 100%);
  color: var(--c-navy);
  box-shadow: 0 4px 10px rgba(50,151,185,0.18);
}

/* ---------- P8. Section depth — backgrounds with engineered texture ---------- */
.section--bg {
  position: relative;
  overflow: hidden;
}
.section--bg::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(50,151,185,0.06) 1px, transparent 1.5px);
  background-size: 32px 32px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse at top, black 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at top, black 0%, transparent 70%);
}
.section--bg > .container { position: relative; z-index: 1; }

.section--bg-alt {
  position: relative;
  overflow: hidden;
}
.section--bg-alt::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(50,151,185,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(50,151,185,0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse at center, black, transparent 85%);
  -webkit-mask-image: radial-gradient(ellipse at center, black, transparent 85%);
}
.section--bg-alt > .container { position: relative; z-index: 1; }

/* Story section: image with engineered frame */
.framed-image {
  position: relative;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--c-navy-2);
  box-shadow: var(--sh-lg);
  isolation: isolate;
}
.framed-image::before {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid rgba(159,228,251,0.2);
  border-radius: inherit;
  z-index: 2;
  pointer-events: none;
}
.framed-image::after {
  content: "";
  position: absolute;
  inset: 14px;
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: calc(var(--r-lg) - 6px);
  z-index: 2;
  pointer-events: none;
}
.framed-image img { display: block; width: 100%; height: 100%; object-fit: cover; }

/* ---------- P9. OEM compatibility wall — upgraded ---------- */
.oem-wall {
  position: relative;
  padding: clamp(2rem, 4vw, 3.25rem);
  background:
    radial-gradient(ellipse at top right, rgba(50,151,185,0.06), transparent 60%),
    var(--c-white);
  border: 1px solid var(--c-hairline);
  border-radius: var(--r-lg);
  text-align: center;
  overflow: hidden;
}
.oem-wall::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(50,151,185,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(50,151,185,0.04) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: radial-gradient(ellipse at center, black, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, black, transparent 80%);
  pointer-events: none;
}
.oem-wall > * { position: relative; z-index: 1; }

.oem-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--c-hairline);
  border: 1px solid var(--c-hairline);
  border-radius: var(--r-md);
  overflow: hidden;
  margin-top: var(--s-6);
}
@media (min-width: 600px) { .oem-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 900px) { .oem-grid { grid-template-columns: repeat(6, 1fr); } }
.oem-grid__cell {
  background: var(--c-white);
  padding: var(--s-5) var(--s-3);
  text-align: center;
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--c-navy);
  font-size: var(--fs-sm);
  letter-spacing: 0.01em;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 76px;
  position: relative;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
@media (hover: hover) {
  .oem-grid__cell:hover { background: var(--c-bg); color: var(--c-steel-deep); }
}

/* ---------- P10. MERV diagram (Data Center) ---------- */
.merv-diagram {
  background: var(--c-white);
  border: 1px solid var(--c-hairline);
  border-radius: var(--r-lg);
  padding: clamp(1.5rem, 3vw, 2.25rem);
  position: relative;
  overflow: hidden;
}
.merv-bar-row {
  display: grid;
  grid-template-columns: 5rem 1fr 8rem;
  gap: var(--s-3);
  align-items: center;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--c-hairline);
}
.merv-bar-row:last-child { border-bottom: 0; }
.merv-bar-row .rating {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--c-navy);
  font-size: var(--fs-md);
}
.merv-bar-row .bar {
  height: 8px;
  background: var(--c-bg-alt);
  border-radius: 999px;
  overflow: hidden;
  position: relative;
}
.merv-bar-row .bar > span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--c-steel-light), var(--c-steel));
  border-radius: 999px;
  transform-origin: left;
  transform: scaleX(0);
  transition: transform 900ms var(--ease);
}
.merv-bar-row.is-visible .bar > span { transform: scaleX(var(--fill, 0.5)); }
.merv-bar-row .use {
  font-size: var(--fs-xs);
  color: var(--c-ink-subtle);
  text-align: right;
}
@media (max-width: 600px) {
  .merv-bar-row { grid-template-columns: 4rem 1fr; }
  .merv-bar-row .use { grid-column: 1 / -1; text-align: left; padding-left: 0; }
}

/* ---------- P11. Tech-callout chips (technical credibility row) ---------- */
.tech-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-2);
  margin-top: var(--s-4);
}
.tech-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.4rem 0.8rem;
  background: rgba(50,151,185,0.08);
  border: 1px solid rgba(50,151,185,0.25);
  color: var(--c-steel-deep);
  border-radius: var(--r-sm);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.04em;
}
.tech-chip::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--c-steel);
}
.tech-chip--on-dark {
  background: rgba(159,228,251,0.1);
  border-color: rgba(159,228,251,0.3);
  color: var(--c-cyan);
}
.tech-chip--on-dark::before { background: var(--c-cyan); box-shadow: 0 0 8px var(--c-cyan); }

/* ---------- P12. Compliance callout — premium ---------- */
.compliance {
  background:
    radial-gradient(ellipse at 80% 20%, rgba(50,151,185,0.3), transparent 60%),
    linear-gradient(135deg, var(--c-navy) 0%, var(--c-ink) 100%);
  position: relative;
  overflow: hidden;
}
.compliance::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse at center, black, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, black, transparent 80%);
  pointer-events: none;
}
.compliance > * { position: relative; z-index: 1; }
.compliance__badges {
  display: flex;
  gap: var(--s-4);
  flex-wrap: wrap;
  margin-top: var(--s-4);
}
.compliance__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.8rem;
  background: rgba(159,228,251,0.1);
  border: 1px solid rgba(159,228,251,0.3);
  border-radius: var(--r-sm);
  color: var(--c-cyan);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ---------- P13. CTA band — premium polish ---------- */
.cta-band {
  position: relative;
  border-top: 1px solid rgba(159,228,251,0.12);
  border-bottom: 1px solid rgba(159,228,251,0.06);
}
.cta-band::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 0% 0%, rgba(159,228,251,0.18), transparent 50%),
    radial-gradient(ellipse at 100% 100%, rgba(50,151,185,0.18), transparent 50%);
  pointer-events: none;
}
.cta-band > * { position: relative; z-index: 1; }
.cta-band h2 { font-size: clamp(1.625rem, 1.3rem + 1.5vw, 2.25rem); }

/* ---------- P14. Accordion polish ---------- */
.accordion details {
  background: var(--c-white);
  transition: border-color var(--t-base) var(--ease),
              box-shadow var(--t-base) var(--ease),
              transform var(--t-base) var(--ease);
}
.accordion details[open] {
  box-shadow: 0 8px 24px rgba(4,17,32,0.08), 0 0 0 1px rgba(50,151,185,0.2) inset;
  transform: translateY(-1px);
}
.accordion details > div {
  animation: faqIn 350ms var(--ease);
}
@keyframes faqIn {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .accordion details > div { animation: none; }
}

/* ---------- P15. Page-hero polish — image overlay ---------- */
.page-hero {
  border-bottom: 1px solid rgba(159,228,251,0.08);
}
.page-hero__visual { opacity: 0.32; }
.page-hero__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at center, transparent 30%, rgba(4,17,32,0.6) 100%),
    linear-gradient(180deg, rgba(4,17,32,0.4) 0%, transparent 30%, transparent 70%, rgba(4,17,32,0.7) 100%);
}
.page-hero h1 {
  font-size: clamp(2rem, 1.5rem + 2.5vw, 3.5rem);
  line-height: 1.05;
}

/* ---------- P16. Footer polish — top hairline accent ---------- */
.footer {
  position: relative;
  border-top: 1px solid rgba(50,151,185,0.18);
}
.footer::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-steel), transparent);
  opacity: 0.6;
}
.footer__brand .header__logo-mark { filter: drop-shadow(0 4px 10px rgba(159,228,251,0.18)); }

/* ---------- P17. Trust strip — premium ---------- */
.trust-strip {
  background: var(--c-white);
  position: relative;
  border-top: 1px solid var(--c-hairline);
  border-bottom: 1px solid var(--c-hairline);
}
.trust-strip__item { padding: clamp(1.25rem, 2vw, 1.75rem) var(--s-4); }
.trust-strip__num {
  font-size: clamp(1.75rem, 1.4rem + 1.5vw, 2.5rem);
  background: linear-gradient(135deg, var(--c-navy), var(--c-steel-deep));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-weight: 700;
}
.trust-strip__item::before {
  content: "";
  display: block;
  width: 24px; height: 2px;
  background: var(--c-steel);
  border-radius: 999px;
  margin-bottom: 0.5rem;
}

/* ---------- P18. Section heads — engineered eyebrow ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}
.eyebrow::before {
  content: "";
  width: 24px; height: 1px;
  background: currentColor;
  opacity: 0.7;
}
.eyebrow--on-dark { color: var(--c-cyan); }

/* ---------- P19. 404 polish ---------- */
.error-page {
  background:
    radial-gradient(ellipse at top, rgba(50,151,185,0.06), transparent 50%);
  position: relative;
}
.error-page__code {
  background: linear-gradient(180deg, var(--c-steel-light) 0%, var(--c-steel) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 60px rgba(50,151,185,0.2);
}

/* ---------- P20. Form polish ---------- */
.field input,
.field textarea,
.field select {
  background: var(--c-white);
  box-shadow: 0 1px 2px rgba(4,17,32,0.04) inset;
}
.form__status[data-state="success"] {
  background:
    linear-gradient(135deg, rgba(50,151,185,0.06), rgba(50,151,185,0.12)),
    var(--c-white);
}
.contact-panel {
  background:
    radial-gradient(ellipse at top right, rgba(50,151,185,0.25), transparent 60%),
    linear-gradient(135deg, var(--c-ink) 0%, var(--c-navy-2) 100%);
  border: 1px solid rgba(159,228,251,0.15);
  box-shadow: 0 16px 48px rgba(4,17,32,0.25);
  position: relative;
  overflow: hidden;
}
.contact-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: radial-gradient(ellipse at top right, black, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at top right, black, transparent 70%);
}
.contact-panel > * { position: relative; z-index: 1; }

/* ---------- P21. Specs table polish ---------- */
.specs {
  border: 1px solid rgba(159,228,251,0.15);
  box-shadow: 0 16px 48px rgba(4,17,32,0.2);
  position: relative;
  overflow: hidden;
}
.specs::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--c-cyan), transparent);
}
.specs__value { font-family: var(--font-display); font-weight: 600; }

/* ---------- P22. Visual MERV ladder helper (Data Center) ---------- */
.merv-ladder {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-3);
}
@media (min-width: 720px) { .merv-ladder { grid-template-columns: 1fr 1fr; } }

/* ============================================================
   POLISH ROUND 2 — Industrial reference quality
   Navy / steel / cool gray only. No gold, bronze, or purple.
   ============================================================ */

/* ---------- R2.1 Hero airflow pattern (SVG, embedded) ---------- */
.hero__airflow {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.55;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 800 600' fill='none' stroke='%239FE4FB' stroke-width='0.6'><path d='M0 80 Q200 60 400 110 T800 100' opacity='0.35'/><path d='M0 160 Q200 140 400 190 T800 180' opacity='0.3'/><path d='M0 240 Q200 220 400 270 T800 260' opacity='0.25'/><path d='M0 320 Q200 300 400 350 T800 340' opacity='0.2'/><path d='M0 400 Q200 380 400 430 T800 420' opacity='0.18'/><path d='M0 480 Q200 460 400 510 T800 500' opacity='0.15'/></svg>");
  background-size: cover;
  background-position: center;
  mask-image: linear-gradient(90deg, transparent 0%, black 25%, black 75%, transparent 100%);
  -webkit-mask-image: linear-gradient(90deg, transparent 0%, black 25%, black 75%, transparent 100%);
  animation: airflowDrift 24s linear infinite;
}
@keyframes airflowDrift {
  0%   { background-position: 0% center; }
  100% { background-position: 100% center; }
}
@media (prefers-reduced-motion: reduce) {
  .hero__airflow { animation: none; }
}

/* ---------- R2.2 Hero quick-paths bar ---------- */
.quick-paths {
  margin-top: var(--s-8);
  padding-top: var(--s-6);
  border-top: 1px solid rgba(159,228,251,0.18);
}
.quick-paths__label {
  display: block;
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--c-cyan);
  margin-bottom: var(--s-3);
  opacity: 0.85;
}
.quick-paths__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-4) var(--s-5);
  list-style: none;
  padding: 0;
  margin: 0;
}
.quick-paths__list li { margin: 0; }
.quick-paths__list a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--c-white);
  text-decoration: none;
  font-size: var(--fs-sm);
  font-weight: 500;
  padding: 0.25rem 0;
  position: relative;
}
.quick-paths__list a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 1px;
  background: var(--c-cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t-base) var(--ease);
}
.quick-paths__list a:hover { color: var(--c-cyan); }
.quick-paths__list a:hover::after { transform: scaleX(1); }
.quick-paths__list a svg { color: var(--c-cyan); transition: transform var(--t-fast) var(--ease); }
.quick-paths__list a:hover svg { transform: translateX(3px); }

/* ---------- R2.3 Engineering Edge section ---------- */
.eng-edge {
  position: relative;
  background:
    linear-gradient(180deg, var(--c-bg) 0%, var(--c-white) 100%);
  overflow: hidden;
}
.eng-edge::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(50,151,185,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(50,151,185,0.05) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  mask-image: linear-gradient(180deg, black 0%, black 60%, transparent 100%);
  -webkit-mask-image: linear-gradient(180deg, black 0%, black 60%, transparent 100%);
}
.eng-edge > .container { position: relative; z-index: 1; }

.edge-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--c-hairline);
  border: 1px solid var(--c-hairline);
  border-radius: var(--r-lg);
  overflow: hidden;
}
@media (min-width: 600px) { .edge-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 900px) { .edge-grid { grid-template-columns: repeat(3, 1fr); } }

.edge-cell {
  background: var(--c-white);
  padding: clamp(1.5rem, 3vw, 2.25rem);
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  position: relative;
  transition: background var(--t-base) var(--ease);
  overflow: hidden;
}
.edge-cell::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 2.5rem; height: 2px;
  background: var(--c-steel);
  transition: width var(--t-base) var(--ease);
}
@media (hover: hover) {
  .edge-cell:hover { background: var(--c-bg); }
  .edge-cell:hover::before { width: 4.5rem; }
}
.edge-cell__icon {
  width: 44px; height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(50,151,185,0.12), rgba(159,228,251,0.18));
  color: var(--c-navy);
  border-radius: var(--r-md);
  margin-bottom: var(--s-2);
}
.edge-cell h4 {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: 600;
}
.edge-cell p {
  margin: 0;
  font-size: var(--fs-sm);
  color: var(--c-ink-subtle);
  line-height: 1.55;
}
.edge-cell__tag {
  margin-top: auto;
  padding-top: var(--s-3);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--c-steel-deep);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.edge-cell__tag::before {
  content: "";
  width: 16px; height: 1px;
  background: currentColor;
}

/* ---------- R2.4 Resources teaser cards ---------- */
.resources-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-4);
}
@media (min-width: 600px) { .resources-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .resources-grid { grid-template-columns: repeat(4, 1fr); } }

.resource-card {
  position: relative;
  background: var(--c-white);
  border: 1px solid var(--c-hairline);
  border-radius: var(--r-lg);
  padding: var(--s-6);
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  min-height: 220px;
  overflow: hidden;
  transition: border-color var(--t-base) var(--ease), transform var(--t-base) var(--ease);
}
.resource-card::after {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  pointer-events: none;
  background: linear-gradient(135deg, transparent 70%, rgba(50,151,185,0.08) 100%);
  opacity: 0;
  transition: opacity var(--t-base) var(--ease);
}
@media (hover: hover) {
  .resource-card:hover { border-color: var(--c-steel-light); transform: translateY(-3px); }
  .resource-card:hover::after { opacity: 1; }
}
.resource-card__type {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.6rem;
  background: var(--c-bg-alt);
  color: var(--c-navy);
  border-radius: var(--r-sm);
  font-size: 0.65rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: 700;
  width: fit-content;
}
.resource-card__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-md);
  color: var(--c-ink);
  margin: 0;
  line-height: 1.25;
}
.resource-card__meta {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--s-3);
  border-top: 1px solid var(--c-hairline);
  font-size: var(--fs-xs);
  color: var(--c-ink-subtle);
}
.resource-card__status {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 600;
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-steel-deep);
}
.resource-card__status::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--c-steel);
  opacity: 0.6;
}
.resource-card__status--soon::before { background: var(--c-steel-mid); }

/* ---------- R2.5 Environments grid (Gas Turbine) ---------- */
.env-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--s-4);
}
@media (min-width: 900px) { .env-grid { grid-template-columns: repeat(4, 1fr); } }
.env-cell {
  position: relative;
  padding: var(--s-6);
  background: var(--c-white);
  border: 1px solid var(--c-hairline);
  border-radius: var(--r-lg);
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  overflow: hidden;
  transition: border-color var(--t-base) var(--ease), transform var(--t-base) var(--ease);
}
@media (hover: hover) {
  .env-cell:hover { border-color: var(--c-steel-light); transform: translateY(-2px); }
}
.env-cell__icon {
  width: 48px; height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--c-cyan) 0%, var(--c-steel-light) 100%);
  color: var(--c-navy);
  border-radius: var(--r-md);
  box-shadow: 0 6px 16px rgba(50,151,185,0.15);
}
.env-cell h5 {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--fs-md);
  font-weight: 600;
  color: var(--c-ink);
  text-transform: none;
  letter-spacing: -0.005em;
}
.env-cell p {
  margin: 0;
  font-size: var(--fs-sm);
  color: var(--c-ink-subtle);
  line-height: 1.5;
}
.env-cell__media {
  margin-top: auto;
  padding-top: var(--s-3);
  border-top: 1px solid var(--c-hairline);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--c-steel-deep);
}

/* ---------- R2.6 Quick-action cards (Contact page) ---------- */
.quick-actions {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-4);
}
@media (min-width: 600px) { .quick-actions { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .quick-actions { grid-template-columns: repeat(4, 1fr); } }
.quick-action {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  padding: var(--s-6);
  background: var(--c-white);
  border: 1px solid var(--c-hairline);
  border-radius: var(--r-lg);
  color: var(--c-ink);
  text-decoration: none;
  overflow: hidden;
  transition: border-color var(--t-base) var(--ease), transform var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease);
}
.quick-action::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--c-steel), var(--c-cyan));
  opacity: 0.55;
  transition: opacity var(--t-base) var(--ease), width var(--t-base) var(--ease);
}
@media (hover: hover) {
  .quick-action:hover { border-color: var(--c-steel-light); transform: translateY(-3px); box-shadow: var(--sh-md); color: var(--c-ink); }
  .quick-action:hover::before { opacity: 1; width: 4px; }
}
.quick-action__icon {
  width: 36px; height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--c-steel-deep);
  background: rgba(50,151,185,0.1);
  border-radius: var(--r-md);
}
.quick-action__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-md);
  margin: 0;
  color: var(--c-ink);
  line-height: 1.2;
}
.quick-action__desc {
  font-size: var(--fs-sm);
  color: var(--c-ink-subtle);
  margin: 0;
  line-height: 1.45;
}
.quick-action__arrow {
  margin-top: auto;
  padding-top: var(--s-3);
  font-weight: 600;
  font-size: var(--fs-sm);
  color: var(--c-steel-deep);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  border-top: 1px solid var(--c-hairline);
}
.quick-action:hover .quick-action__arrow svg { transform: translateX(3px); }
.quick-action__arrow svg { transition: transform var(--t-fast) var(--ease); }

/* ---------- R2.7 Trust strip refinement (replace stat-row dependency) ---------- */
.trust-strip__list {
  position: relative;
}
.trust-strip__item {
  align-items: flex-start;
  text-align: left;
  padding-inline: clamp(1rem, 2vw, 1.5rem);
}
.trust-strip__item::before { margin: 0 0 0.6rem; }
.trust-strip__num { text-align: left; }
.trust-strip__label { text-align: left; }
@media (max-width: 719px) {
  .trust-strip__item { align-items: center; text-align: center; }
  .trust-strip__item::before { margin: 0 auto 0.6rem; }
  .trust-strip__num, .trust-strip__label { text-align: center; }
}

/* ---------- R2.8 Section header — eyebrow w/ tick ---------- */
.section-head--center .eyebrow { justify-content: center; }
.section-head--center .eyebrow::before { display: none; }
.section-head--center .eyebrow::after {
  content: "";
  width: 24px; height: 1px;
  background: currentColor;
  opacity: 0.7;
}

/* ---------- R2.9 Header polish ---------- */
.header__logo-mark { color: var(--c-steel); transition: transform var(--t-base) var(--ease); }
.header__logo:hover .header__logo-mark { transform: rotate(-2deg) scale(1.04); }
.header--scrolled .header__logo-mark { color: var(--c-steel-deep); }

/* Add a thin top hairline accent to the sticky header */
.header::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(50,151,185,0.5), transparent);
  opacity: 0;
  transition: opacity var(--t-base) var(--ease);
}
.header--scrolled::before { opacity: 1; }

/* ---------- R2.10 Footer enhancement ---------- */
.footer__brand p { margin-bottom: var(--s-5); }
.footer__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 1.1rem;
  border: 1px solid rgba(159,228,251,0.3);
  background: rgba(159,228,251,0.08);
  color: var(--c-cyan);
  border-radius: var(--r-md);
  font-size: var(--fs-sm);
  font-weight: 600;
  text-decoration: none;
  transition: background var(--t-base) var(--ease), border-color var(--t-base) var(--ease);
  margin-top: var(--s-3);
}
.footer__cta:hover {
  background: rgba(159,228,251,0.15);
  border-color: var(--c-cyan);
  color: var(--c-white);
}
.footer__cta svg { transition: transform var(--t-fast) var(--ease); }
.footer__cta:hover svg { transform: translateX(3px); }

/* ---------- R2.11 Compliance badge polish ---------- */
.compliance__badges { gap: 0.5rem; }
.compliance__badge { padding: 0.4rem 0.7rem; }

/* ---------- R2.12 Specs polish ---------- */
.specs h3 { font-size: var(--fs-xl); }
.specs__label { font-size: 0.65rem; }

/* ---------- R2.13 CTA band — accent line on top ---------- */
.cta-band::before {
  /* keep the grid pattern from earlier */
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at center, black, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, black, transparent 75%);
  pointer-events: none;
}
.cta-band__inner { position: relative; }
.cta-band__inner::before {
  content: "";
  position: absolute;
  top: -1.5rem; left: 0;
  width: 40px; height: 2px;
  background: var(--c-cyan);
  opacity: 0.7;
}

/* ---------- R2.14 Mobile menu — premium polish ---------- */
.mobile-menu {
  background-image:
    radial-gradient(ellipse at top right, rgba(50,151,185,0.25), transparent 60%),
    linear-gradient(180deg, var(--c-ink), var(--c-navy-2));
}
.mobile-menu__nav a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-3);
}
.mobile-menu__nav a::after {
  content: "›";
  color: var(--c-cyan);
  font-size: 1.5rem;
  opacity: 0.5;
  transition: transform var(--t-fast) var(--ease), opacity var(--t-fast) var(--ease);
}
.mobile-menu__nav a:hover::after { transform: translateX(4px); opacity: 1; }

/* ---------- R2.16 Hide placeholder social links until real URLs land ---------- */
/* Re-enable by deleting this block once Facebook/YouTube/LinkedIn URLs are supplied */
.footer__social,
.contact-panel .footer__social { display: none; }
.contact-panel > div:has(> .footer__social) { display: none; }

/* ============================================================
   POLISH ROUND 4 — Donaldson/Camfil tier
   Featured product, markets, standards, sustainability, product-led hero
   ============================================================ */

/* ---------- R4.1 Product-led hero visual ---------- */
.hero__visual--product {
  background:
    radial-gradient(ellipse at 50% 35%, rgba(159,228,251,0.18), transparent 65%),
    linear-gradient(160deg, var(--c-navy-2) 0%, var(--c-ink) 70%, #020a16 100%);
  aspect-ratio: 4 / 5;
}
.hero__visual--product img {
  object-fit: contain;
  padding: 14% 12%;
  filter: drop-shadow(0 30px 50px rgba(0,0,0,0.55)) brightness(1.04) contrast(1.05);
  mix-blend-mode: normal;
}
.hero__visual--product::before {
  /* spotlight ground-glow under product */
  content: "";
  position: absolute;
  bottom: 6%; left: 12%; right: 12%;
  height: 14%;
  background: radial-gradient(ellipse at center, rgba(159,228,251,0.28), transparent 70%);
  pointer-events: none;
  z-index: 0;
  filter: blur(8px);
}
.hero__visual--product .hero__overlay-tag,
.hero__visual--product .hero__spec-row {
  z-index: 4;
}

/* Variation filter for repeated power-plant image */
img.img-treatment-a { filter: brightness(0.92) contrast(1.05) saturate(0.85); }
img.img-treatment-b { filter: brightness(0.85) contrast(1.1) saturate(0.7) hue-rotate(-4deg); }
img.img-treatment-c { filter: brightness(0.78) contrast(1.15) saturate(0.6); }

/* ---------- R4.2 Hero sequenced entrance ---------- */
.hero__copy { opacity: 1; }
@media (prefers-reduced-motion: no-preference) {
  .hero__copy > .eyebrow,
  .hero__copy > h1,
  .hero__copy > .lede,
  .hero__copy > .hero__ctas,
  .hero__copy > .tech-row,
  .hero__copy > .quick-paths {
    opacity: 0;
    transform: translateY(10px);
    animation: heroEntry 700ms var(--ease) forwards;
  }
  .hero__copy > .eyebrow     { animation-delay: 100ms; }
  .hero__copy > h1           { animation-delay: 230ms; }
  .hero__copy > .lede        { animation-delay: 460ms; }
  .hero__copy > .hero__ctas  { animation-delay: 620ms; }
  .hero__copy > .tech-row    { animation-delay: 780ms; }
  .hero__copy > .quick-paths { animation-delay: 940ms; }
  .hero__visual--product {
    opacity: 0;
    transform: translateY(14px);
    animation: heroEntry 900ms var(--ease) 350ms forwards;
  }
}
@keyframes heroEntry {
  to { opacity: 1; transform: none; }
}

/* ---------- R4.3 Big-stat block ---------- */
.big-stat {
  position: relative;
  padding: clamp(3rem, 6vw, 5rem) 0;
  text-align: center;
  background:
    linear-gradient(180deg, var(--c-bg) 0%, var(--c-white) 100%);
  overflow: hidden;
}
.big-stat::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(50,151,185,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(50,151,185,0.04) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
  pointer-events: none;
}
.big-stat__num {
  position: relative;
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(4.5rem, 10vw, 9rem);
  line-height: 0.95;
  letter-spacing: -0.04em;
  background: linear-gradient(180deg, var(--c-navy) 0%, var(--c-steel-deep) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.big-stat__num .plus {
  font-size: 0.5em;
  vertical-align: top;
  margin-top: 0.6em;
  display: inline-block;
  background: linear-gradient(180deg, var(--c-steel) 0%, var(--c-steel-deep) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.big-stat__label {
  position: relative;
  display: block;
  margin-top: var(--s-3);
  font-family: var(--font-ui);
  font-size: var(--fs-md);
  color: var(--c-ink-subtle);
  letter-spacing: 0.04em;
}
.big-stat__sub {
  position: relative;
  display: block;
  margin-top: var(--s-4);
  font-size: var(--fs-sm);
  color: var(--c-ink-subtle);
  max-width: 36rem;
  margin-inline: auto;
}

/* ---------- R4.4 Markets grid (6-cell) ---------- */
.markets-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--c-hairline);
  border: 1px solid var(--c-hairline);
  border-radius: var(--r-lg);
  overflow: hidden;
}
@media (min-width: 700px) { .markets-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1100px) { .markets-grid { grid-template-columns: repeat(6, 1fr); } }

.market-cell {
  background: var(--c-white);
  padding: clamp(1.25rem, 2.5vw, 1.75rem) clamp(1rem, 2vw, 1.5rem);
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  position: relative;
  text-decoration: none;
  color: var(--c-ink);
  transition: background var(--t-base) var(--ease);
}
@media (hover: hover) {
  .market-cell:hover { background: var(--c-bg); color: var(--c-ink); }
}
.market-cell::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  height: 2px; width: 2rem;
  background: var(--c-steel);
  transition: width var(--t-base) var(--ease);
}
@media (hover: hover) {
  .market-cell:hover::before { width: 3.5rem; }
}
.market-cell__icon {
  width: 36px; height: 36px;
  display: inline-flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--c-cyan), var(--c-steel-light));
  color: var(--c-navy);
  border-radius: var(--r-sm);
  margin-bottom: var(--s-1);
}
.market-cell h5 {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--fs-md);
  font-weight: 600;
  color: var(--c-ink);
  line-height: 1.15;
}
.market-cell p {
  margin: 0;
  font-size: var(--fs-xs);
  color: var(--c-ink-subtle);
  line-height: 1.45;
}

/* ---------- R4.5 Featured product spotlight ---------- */
.spotlight {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-lg);
  background:
    radial-gradient(ellipse at 75% 25%, rgba(50,151,185,0.32), transparent 60%),
    radial-gradient(ellipse at 15% 85%, rgba(159,228,251,0.18), transparent 60%),
    linear-gradient(135deg, var(--c-ink) 0%, var(--c-navy-2) 100%);
  color: var(--c-white);
  padding: clamp(2rem, 4vw, 3rem);
  display: grid;
  gap: var(--s-8);
  grid-template-columns: 1fr;
  align-items: center;
  border: 1px solid rgba(159,228,251,0.15);
  box-shadow: 0 20px 60px rgba(4,17,32,0.4);
}
@media (min-width: 900px) {
  .spotlight {
    grid-template-columns: 5fr 6fr;
    gap: var(--s-12);
    padding: clamp(2.5rem, 4vw, 4rem);
  }
}
.spotlight::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse at center, black, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, black, transparent 80%);
  pointer-events: none;
}
.spotlight > * { position: relative; z-index: 1; }

.spotlight__image {
  position: relative;
  aspect-ratio: 1 / 1;
  background:
    radial-gradient(ellipse at 50% 35%, rgba(159,228,251,0.22), transparent 65%),
    linear-gradient(160deg, rgba(255,255,255,0.04), transparent);
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid rgba(159,228,251,0.18);
}
.spotlight__image::after {
  content: "";
  position: absolute;
  bottom: 8%; left: 18%; right: 18%;
  height: 14%;
  background: radial-gradient(ellipse at center, rgba(159,228,251,0.3), transparent 70%);
  filter: blur(8px);
  pointer-events: none;
}
.spotlight__image img {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  object-fit: contain;
  padding: 10%;
  filter: drop-shadow(0 20px 30px rgba(0,0,0,0.5)) brightness(1.05) contrast(1.05);
}
.spotlight__image-corners {
  position: absolute; inset: 0;
  pointer-events: none;
}
.spotlight__image-corners::before,
.spotlight__image-corners::after {
  content: "";
  position: absolute;
  width: 28px; height: 28px;
  border: 1px solid var(--c-cyan);
  opacity: 0.65;
}
.spotlight__image-corners::before { top: 14px; left: 14px; border-right: 0; border-bottom: 0; }
.spotlight__image-corners::after { bottom: 14px; right: 14px; border-left: 0; border-top: 0; }

.spotlight__body { display: flex; flex-direction: column; gap: var(--s-4); }
.spotlight__eyebrow {
  font-family: var(--font-ui);
  font-size: 0.6875rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--c-cyan);
  display: inline-flex; align-items: center; gap: 0.6rem;
  margin: 0;
}
.spotlight__eyebrow::before {
  content: "";
  width: 28px; height: 1px;
  background: currentColor; opacity: 0.7;
}
.spotlight__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.875rem, 1.4rem + 1.8vw, 2.75rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--c-white);
  margin: 0;
}
.spotlight__desc {
  color: var(--c-powder);
  font-size: var(--fs-md);
  line-height: 1.55;
  margin: 0;
  max-width: 36rem;
}
.spotlight__specs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: rgba(159,228,251,0.15);
  border: 1px solid rgba(159,228,251,0.18);
  border-radius: var(--r-md);
  overflow: hidden;
  margin-block: var(--s-3);
}
@media (min-width: 600px) { .spotlight__specs { grid-template-columns: repeat(4, 1fr); } }
.spotlight__spec {
  background: rgba(4,17,32,0.4);
  padding: 0.85rem 0.6rem;
  text-align: center;
}
.spotlight__spec .v {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-md);
  color: var(--c-white);
  line-height: 1;
}
.spotlight__spec .l {
  display: block;
  font-size: 0.6rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-cyan);
  font-weight: 600;
  margin-top: 0.4rem;
}
.spotlight__actions {
  display: flex;
  gap: var(--s-3);
  flex-wrap: wrap;
  margin-top: var(--s-2);
}

/* ---------- R4.6 Standards row ---------- */
.standards-row {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--s-4) var(--s-8);
  padding: var(--s-6) var(--s-4);
  border-top: 1px solid var(--c-hairline);
  border-bottom: 1px solid var(--c-hairline);
}
.standards-row__label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-ui);
  font-size: 0.6875rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-steel-deep);
  font-weight: 700;
}
.standards-row__label::before {
  content: "";
  width: 24px; height: 1px;
  background: currentColor;
  opacity: 0.7;
}
.standards-row__items {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-3) var(--s-6);
  list-style: none;
  margin: 0; padding: 0;
}
.standards-row__items li {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-base);
  color: var(--c-navy);
  letter-spacing: 0.01em;
  position: relative;
}
.standards-row__items li:not(:last-child)::after {
  content: "";
  position: absolute;
  right: calc(-1 * var(--s-3));
  top: 50%;
  width: 3px; height: 3px;
  border-radius: 50%;
  background: var(--c-steel);
  transform: translateY(-50%);
  opacity: 0.5;
}

/* ---------- R4.7 Sustainability callout ---------- */
.sustain {
  position: relative;
  background:
    radial-gradient(ellipse at 20% 100%, rgba(159,228,251,0.18), transparent 60%),
    linear-gradient(180deg, var(--c-white) 0%, var(--c-bg) 100%);
  border-radius: var(--r-lg);
  padding: clamp(2rem, 4vw, 3rem);
  border: 1px solid var(--c-hairline);
  overflow: hidden;
}
.sustain::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--c-steel), transparent);
  opacity: 0.7;
}
.sustain__head { max-width: 56rem; margin-bottom: var(--s-8); }
.sustain__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-6);
}
@media (min-width: 800px) { .sustain__grid { grid-template-columns: repeat(3, 1fr); } }
.sustain__pillar {
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  padding: var(--s-5);
  background: var(--c-white);
  border: 1px solid var(--c-hairline);
  border-radius: var(--r-md);
  position: relative;
}
.sustain__pillar::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 32px; height: 2px;
  background: var(--c-steel);
}
.sustain__pillar h4 {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--fs-md);
  font-weight: 600;
}
.sustain__pillar p {
  margin: 0;
  font-size: var(--fs-sm);
  color: var(--c-ink-subtle);
  line-height: 1.5;
}
.sustain__pillar__tag {
  margin-top: auto;
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--c-steel-deep);
}

/* ---------- R4.8 Section head — slightly larger top eyebrow with separator ---------- */
.section-head h2 {
  font-size: clamp(1.75rem, 1.4rem + 1.6vw, 2.5rem);
}

/* ---------- R4.9 Product page category intro ---------- */
.cat-intro {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-4);
  padding: var(--s-6) 0;
  margin-bottom: var(--s-8);
  border-top: 1px solid var(--c-hairline);
}
@media (min-width: 700px) {
  .cat-intro { grid-template-columns: 4rem 1fr auto; align-items: center; gap: var(--s-8); }
}
.cat-intro__num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-2xl);
  color: var(--c-steel-light);
  line-height: 1;
}
.cat-intro__body h3 { margin: 0 0 var(--s-2); font-size: var(--fs-xl); }
.cat-intro__body p { margin: 0; color: var(--c-ink-subtle); font-size: var(--fs-sm); max-width: 50rem; }

/* nHIBIT featured product card variant */
.product-card--featured {
  grid-column: 1 / -1;
}
@media (min-width: 700px) { .product-card--featured { grid-column: span 2; } }
.product-card--featured .card__media--square { aspect-ratio: 4 / 3; }
.product-card--featured .card__body { gap: var(--s-3); padding: var(--s-6); }
.product-card--featured .card__title { font-size: var(--fs-xl); font-family: var(--font-display); font-weight: 700; }
.product-card--featured .card__desc { font-size: var(--fs-base); }
.product-card--featured::before {
  content: "FEATURED";
  position: absolute;
  top: 14px; left: 14px;
  z-index: 5;
  padding: 0.3rem 0.6rem;
  background: rgba(4,17,32,0.85);
  color: var(--c-cyan);
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  font-weight: 700;
  border-radius: var(--r-sm);
  border: 1px solid rgba(159,228,251,0.3);
}

/* ---------- R4.10 Five-pillar grid (About) ---------- */
.grid--5-pillar {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-5);
}
@media (min-width: 600px) { .grid--5-pillar { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .grid--5-pillar { grid-template-columns: repeat(5, 1fr); } }

/* ---------- R4.11 Hero CTA refinement ---------- */
.btn--lg { padding: 1.125rem 2rem; font-size: var(--fs-md); font-weight: 600; }

/* ---------- R4.12 Print preserved ---------- */
@media print {
  .header, .footer, .utility, .cta-band, .mobile-menu, .menu-toggle,
  .scan-line, .hero__overlay-tag, .hero__spec-row, .hero__airflow,
  .spotlight, .standards-row, .sustain, .big-stat { display: none !important; }
  body { color: #000; background: #fff; }
  .hero, .page-hero, .section--ink, .section--navy, .cta-band, .compliance, .contact-panel, .specs {
    background: #fff !important; color: #000 !important;
  }
}