/**
 * 3D Industry Flip Cards — reusable on homepage, services, industries pages
 * Front: industry icon + name
 * Back: description + CTA
 * Pure CSS 3D transform, JS-to-Rust compliant
 */

.flip-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

/* Card wrapper — sets 3D perspective */
.flip-card {
  perspective: 800px;
  height: 280px;
}

.flip-card__inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.7s var(--ease-spring-soft);
  transform-style: preserve-3d;
}

.flip-card:hover .flip-card__inner,
.flip-card:focus-within .flip-card__inner {
  transform: rotateY(180deg);
}

/* Front and back faces */
.flip-card__front,
.flip-card__back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: var(--space-lg) var(--space-md);
  text-align: center;
  overflow: hidden;
}

/* Front face */
.flip-card__front {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border-light);
}

.flip-card__icon {
  font-size: 3rem;
  margin-bottom: var(--space-sm);
  line-height: 1;
}

.flip-card__name {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--color-text);
}

/* Back face */
.flip-card__back {
  background: var(--gradient-e57-hero);
  color: #fff;
  transform: rotateY(180deg);
  justify-content: space-between;
  padding: var(--space-md);
}

.flip-card__back::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--noise-fine);
  background-size: 256px 256px;
  mix-blend-mode: overlay;
  pointer-events: none;
}

.flip-card__desc {
  position: relative;
  z-index: 1;
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.75);
  line-height: var(--leading-relaxed);
}

.flip-card__back-name {
  position: relative;
  z-index: 1;
  font-size: var(--text-md);
  font-weight: var(--font-bold);
  color: #fff;
  margin-bottom: var(--space-xs);
}

.flip-card__cta {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--e57-green-light);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-precision);
}

.flip-card__cta:hover {
  color: #fff;
}

/* Color accents per industry — top border on front */
.flip-card--oil-gas .flip-card__front       { border-top: 3px solid var(--e57-amber); }
.flip-card--power .flip-card__front          { border-top: 3px solid var(--e57-blue-light); }
.flip-card--water .flip-card__front          { border-top: 3px solid #3b82f6; }
.flip-card--semiconductor .flip-card__front  { border-top: 3px solid #8b5cf6; }
.flip-card--pulp-paper .flip-card__front     { border-top: 3px solid var(--e57-green); }
.flip-card--chemical .flip-card__front       { border-top: 3px solid var(--e57-red); }

/* ═══ COMPACT VARIANT — for subpages (About, Services, Partners, Contact) ═══ */

.flip-grid--compact {
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-sm);
}

.flip-grid--compact .flip-card {
  height: 180px;
}

.flip-grid--compact .flip-card__front {
  padding: var(--space-sm) var(--space-xs);
}

.flip-grid--compact .flip-card__icon {
  font-size: 1.75rem;
  margin-bottom: var(--space-2xs);
}

.flip-grid--compact .flip-card__name {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
}

.flip-grid--compact .flip-card__front-desc {
  font-size: 10px;
  color: var(--color-text-muted);
  line-height: var(--leading-normal);
  margin-top: var(--space-3xs);
}

.flip-grid--compact .flip-card__back {
  padding: var(--space-sm);
  justify-content: center;
  gap: var(--space-xs);
}

.flip-grid--compact .flip-card__back-name {
  font-size: var(--text-sm);
  margin-bottom: 0;
}

.flip-grid--compact .flip-card__desc {
  font-size: 11px;
  line-height: var(--leading-snug);
}

.flip-grid--compact .flip-card__cta {
  font-size: 11px;
}

/* ── Responsive ── */

@media (max-width: 1024px) {
  .flip-grid { grid-template-columns: repeat(2, 1fr); }
  .flip-grid--compact { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 640px) {
  .flip-grid { grid-template-columns: 1fr; }
  .flip-grid--compact { grid-template-columns: repeat(2, 1fr); }
  .flip-card { height: 240px; }
  .flip-grid--compact .flip-card { height: 160px; }
}

/* Reduced motion — no flip, show back on hover via opacity */
@media (prefers-reduced-motion: reduce) {
  .flip-card__inner { transition: none; }
  .flip-card:hover .flip-card__inner { transform: none; }
  .flip-card:hover .flip-card__front { opacity: 0; }
  .flip-card:hover .flip-card__back {
    transform: none;
    opacity: 1;
  }
}