/* ── Scroll-reveal animations (appended) ───────────────── */
.usp-card,
.product-card,
.step-card {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .4s ease var(--delay, 0ms), transform .4s ease var(--delay, 0ms);
}
.usp-card.is-visible,
.product-card.is-visible,
.step-card.is-visible {
  opacity: 1;
  transform: none;
}

/* invalid form fields */
.is-invalid {
  border-color: var(--col-red) !important;
  box-shadow: 0 0 0 3px rgba(230,48,18,.15);
}

/* sticky header shadow on scroll */
.site-header.is-scrolled {
  box-shadow: 0 2px 20px rgba(0,0,0,.12);
}