/* ==========================================================================
   HOME / CHEMID-STYLE LANDING (M8)
   Transparent overlay nav, full-screen hero slider, stats cards, expertise.
   Depends on tokens.css + global.css (loaded first).
   ========================================================================== */

/* ---------- Overlay header (transparent over hero → solid on scroll) ------ */
.site-header--overlay {
  position: fixed;
  top: 0; left: 0; right: 0;
  background: transparent;
  border-bottom-color: transparent;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
  transition: background var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.site-header--overlay .brand,
.site-header--overlay .nav__link { color: #fff; }
.site-header--overlay .brand__mark { color: #fff; }
.site-header--overlay .brand__name small { color: rgba(255, 255, 255, 0.8); }
.site-header--overlay .nav__link:hover,
.site-header--overlay .nav__link[aria-current="page"] { color: #fff; }

/* Solid state (JS toggles .is-solid past 60px) */
.site-header--overlay.is-solid {
  background: rgba(255, 255, 255, 0.95);
  -webkit-backdrop-filter: saturate(180%) blur(8px);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--color-line);
  box-shadow: var(--shadow-sm);
}
.site-header--overlay.is-solid .brand,
.site-header--overlay.is-solid .nav__link { color: var(--color-ink); }
.site-header--overlay.is-solid .brand__mark { color: var(--color-primary); }
.site-header--overlay.is-solid .brand__name small { color: var(--color-muted); }
.site-header--overlay.is-solid .nav__link:hover,
.site-header--overlay.is-solid .nav__link[aria-current="page"] { color: var(--color-primary-dark); }

/* Header phone: white over the hero, reverts to dark when the header solidifies */

/* ---------- Buttons on dark backgrounds ---------- */
.btn--on-dark { color: #fff; border-color: rgba(255, 255, 255, 0.6); background: transparent; }
.btn--on-dark:hover { background: #fff; color: var(--color-primary-dark); border-color: #fff; }

/* ---------- Hero slider ---------- */
.hero-slider {
  position: relative;
  height: 100vh;
  height: 100svh;
  min-height: 600px;
  max-height: 920px;
  overflow: hidden;
  background: var(--color-primary-darker);
}
.hero-slider__viewport { position: absolute; inset: 0; }

.hero-slide {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.8s ease;
}
.hero-slide.is-active { opacity: 1; visibility: visible; z-index: 1; }

.hero-slide__media { position: absolute; inset: 0; }
.hero-slide__media picture,
.hero-slide__media img { width: 100%; height: 100%; }
.hero-slide__media img { object-fit: cover; object-position: center; }

.hero-slide__scrim {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    rgba(9, 20, 43, 0.85) 0%,
    rgba(9, 20, 43, 0.6) 45%,
    rgba(9, 20, 43, 0.28) 100%
  );
}

.hero-slide__content {
  position: relative;
  z-index: 2;
  color: #fff;
  padding-block: calc(var(--header-h) + 1rem);
  max-width: 780px;
}
.hero-slide__eyebrow {
  display: inline-block;
  color: var(--color-yellow-bright);
  font-weight: var(--fw-bold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: var(--fs-eyebrow);
  margin-bottom: var(--space-2);
}
.hero-slide__title {
  color: #fff;
  font-size: clamp(2.2rem, 5.2vw, 4rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  max-width: 16ch;
}
.hero-slide__text {
  color: rgba(255, 255, 255, 0.92);
  font-size: var(--fs-lg);
  margin-top: var(--space-3);
  max-width: 50ch;
}
.hero-slide__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

/* Subtle rise-in for the active slide's copy */
@media (prefers-reduced-motion: no-preference) {
  .hero-slide__content > * { opacity: 0; transform: translateY(14px); }
  .hero-slide.is-active .hero-slide__content > * {
    opacity: 1;
    transform: none;
    transition: opacity 0.6s ease, transform 0.6s ease;
  }
  .hero-slide.is-active .hero-slide__eyebrow { transition-delay: 0.15s; }
  .hero-slide.is-active .hero-slide__title { transition-delay: 0.25s; }
  .hero-slide.is-active .hero-slide__text { transition-delay: 0.35s; }
  .hero-slide.is-active .hero-slide__actions { transition-delay: 0.45s; }
}

/* Arrows */
.hero-slider__arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 5;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.4);
  cursor: pointer;
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.hero-slider__arrow:hover {
  background: var(--color-yellow);
  color: var(--color-ink);
  border-color: var(--color-yellow);
}
.hero-slider__arrow--prev { left: clamp(0.75rem, 3vw, 2rem); }
.hero-slider__arrow--next { right: clamp(0.75rem, 3vw, 2rem); }

/* Progress tabs (desktop) — active bar fills 0→100% over the autoplay timer.
   JS sets the fill element's inline width; on mobile these collapse to dots. */
.hero-slider__tabs {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  z-index: 5;
  width: 100%;
  max-width: var(--container-max);
  padding: 0 var(--gutter) clamp(1rem, 3vh, 2rem);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(0.75rem, 2vw, 1.75rem);
}
.hero-slider__tab {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  padding: 0;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
  color: rgba(255, 255, 255, 0.6);
  transition: color var(--transition);
}
.hero-slider__tab-track {
  position: relative;
  height: 3px;
  background: rgba(255, 255, 255, 0.28);
  overflow: hidden;
}
.hero-slider__tab-fill {
  position: absolute;
  top: 0; left: 0; bottom: 0;
  width: 0;
  background: #fff;
}
.hero-slider__tab-row { display: flex; align-items: center; gap: 0.55rem; }
.hero-slider__tab-num { font-size: 1.6rem; font-weight: var(--fw-black); line-height: 1; }
.hero-slider__tab-label {
  font-size: 0.72rem;
  font-weight: var(--fw-bold);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  line-height: 1.2;
}
.hero-slider__tab:hover { color: rgba(255, 255, 255, 0.85); }
.hero-slider__tab.is-active { color: #fff; }

/* Mobile (≤900px): collapse the tabs back to simple dots (PC-only bar feature) */
@media (max-width: 900px) {
  .hero-slider__tabs {
    max-width: none;
    padding: 0;
    bottom: clamp(1rem, 4vh, 2.5rem);
    display: flex;
    justify-content: center;
    gap: 0.6rem;
  }
  .hero-slider__tab { width: 24px; height: 24px; display: grid; place-items: center; gap: 0; }
  .hero-slider__tab-track, .hero-slider__tab-row { display: none; }
  .hero-slider__tab::before {
    content: "";
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 2px solid #fff;
    background: transparent;
    transition: background var(--transition), transform var(--transition);
  }
  .hero-slider__tab.is-active::before { background: var(--color-yellow); border-color: var(--color-yellow); transform: scale(1.2); }
}

/* ---------- Applications cards (non-link variant) ---------- */
.app-card { height: 100%; }
.section__cta { text-align: center; margin-top: var(--space-4); }

/* 8th applications tile — "See all applications" over a collage of the
   applications that live inside /applications/ only */
.app-all {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 260px;
  padding: var(--space-4);
  overflow: hidden;
  color: #fff;
}
.app-all picture,
.app-all__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.app-all__scrim {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(12, 26, 43, 0.55), rgba(12, 26, 43, 0.78));
  transition: background var(--transition);
}
.app-all:hover .app-all__scrim {
  background: linear-gradient(180deg, rgba(15, 79, 214, 0.62), rgba(15, 79, 214, 0.85));
}
.app-all__content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}
.app-all__icon {
  width: 56px;
  height: 56px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.18);
  color: #fff;
}
.app-all__title { color: #fff; font-size: 1.2rem; }
.app-all p { color: rgba(255, 255, 255, 0.92); font-size: var(--fs-sm); }
.app-all__list {
  list-style: none;
  margin-top: 0.7rem;
  display: grid;
  gap: 0.35rem;
  text-align: left;
}
.app-all__list li {
  position: relative;
  padding-left: 1.1rem;
  color: rgba(255, 255, 255, 0.95);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
}
.app-all__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.55);
}

/* ---------- Explore our expertise (image-backed tiles) ---------- */
.expertise-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: var(--space-3);
}
.expertise-tile {
  position: relative;
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--color-line);
  box-shadow: var(--shadow-sm);
  border-radius: var(--radius);
  overflow: hidden;
  isolation: isolate;
  transition: transform var(--transition), box-shadow var(--transition);
}
.expertise-tile:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
/* Title sits fully ON the image; body text sits fully on the white area below */
.expertise-tile__media { position: relative; aspect-ratio: 16 / 10; overflow: hidden; }
.expertise-tile__media img { width: 100%; height: 100%; object-fit: cover; }
.expertise-tile__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(9, 20, 43, 0) 40%, rgba(9, 20, 43, 0.78) 100%);
}
.expertise-tile__title {
  position: absolute;
  left: var(--space-2);
  right: var(--space-2);
  bottom: 0.85rem;
  z-index: 1;
  color: #fff;
  font-size: 1.15rem;
  line-height: 1.25;
}
.expertise-tile__body { padding: var(--space-2) var(--space-2) var(--space-3); }
.expertise-tile__body p { color: var(--color-body); font-size: var(--fs-sm); }

/* Offset the anchored Technical Services section below the fixed two-tier header
   (nav row + 34px utility strip on desktop) */
#technical-services { scroll-margin-top: calc(var(--header-h) + 34px + 1rem); }

/* ---------- Technical articles (featured card on the homepage) ---------- */
.article-feature {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  background: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}
.article-feature:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.article-feature__media picture { display: block; height: 100%; }
.article-feature__media img { width: 100%; height: 100%; object-fit: cover; }
.article-feature__body { padding: var(--space-4); display: flex; flex-direction: column; gap: var(--space-2); }
.article-feature__tag {
  color: var(--color-primary-dark);
  font-size: var(--fs-eyebrow);
  font-weight: var(--fw-bold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.article-feature__body h3 { font-size: var(--fs-h3); }
.article-feature__body p { color: var(--color-muted); }
.article-feature .card__link { margin-top: auto; }
@media (max-width: 768px) {
  .article-feature { grid-template-columns: 1fr; }
  .article-feature__media { max-height: 220px; }
}

/* Service tiles are anchor targets from the nav dropdown */
.expertise-tile[id] { scroll-margin-top: calc(var(--header-h) + 34px + 1rem); }

/* ---------- Compact category cards (denser homepage product grid) ---------- */
.cards-compact { gap: var(--space-2); }
.cards-compact .card__media { aspect-ratio: 16 / 10; }
.cards-compact .card__body { padding: var(--space-2); gap: 0.35rem; }
.cards-compact .card__title { font-size: 1rem; }
.cards-compact .card__body p {
  font-size: var(--fs-sm);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.cards-compact .card__link { font-size: 0.85rem; }

/* ---------- Stats band (count-up, directly under the hero) ---------- */
.stats-band {
  background: var(--color-bg-alt);
  padding-block: clamp(1.75rem, 4vw, 2.75rem);
}
.stats-band__grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: var(--space-2);
  text-align: center;
}
.stats-band__item {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.35rem;
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: var(--space-3) var(--space-2);
}
/* Minimal watermark icon behind each stat (globe, flask, …) */
.stats-band__item { position: relative; overflow: hidden; }
.stats-band__icon {
  position: absolute;
  right: -8px;
  bottom: -8px;
  width: 64px;
  height: 64px;
  color: var(--color-primary-dark);
  opacity: 0.08;
  pointer-events: none;
}
.stats-band__num,
.stats-band__label { position: relative; z-index: 1; }
.stats-band__num {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3.2vw, 2.4rem);
  font-weight: var(--fw-black);
  color: var(--color-primary-dark);
  line-height: 1;
}
.stats-band__label {
  font-size: var(--fs-sm);
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
@media (max-width: 900px) {
  .stats-band__grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 480px) {
  .stats-band__grid { grid-template-columns: repeat(2, 1fr); }
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .hero-slider { height: auto; min-height: 88svh; max-height: none; }
  .hero-slider__arrow { display: none; }
  .hero-slide__scrim {
    background: linear-gradient(180deg, rgba(9, 20, 43, 0.7) 0%, rgba(9, 20, 43, 0.55) 60%, rgba(9, 20, 43, 0.7) 100%);
  }
}
/* Mobile slide-in menu: solid white panel needs dark links even in overlay mode */
@media (max-width: 900px) {
  .site-header--overlay .nav { background: #fff; }
  .site-header--overlay .nav__link { color: var(--color-ink); }
  .site-header--overlay .nav__link:hover,
  .site-header--overlay .nav__link[aria-current="page"] {
    color: var(--color-primary-dark);
    background: var(--color-primary-tint);
  }
  /* "Menu" trigger stays readable on the transparent hero header */
  .site-header--overlay:not(.is-solid) .nav-toggle { color: #fff; }
}