/* ============================================================
   Engineering Excellence Showcase
   Scroll-driven industrial storytelling section
   Part of Bishnu Moulds unified design system (bm- prefix)
   ============================================================ */

/* ---- CSS Custom Properties (scoped to section) ---- */
.bm-eng-showcase {
  /* 60-30-10 palette */
  --bm-eng-bg: #020C1A;              /* Storm Harbor */
  --bm-eng-surface: #0B1215;         /* Midnight Abyss */
  --bm-eng-accent: #9BACD8;          /* Aster Flower Blue */
  --bm-eng-text: #F2F6FC;            /* Snow */
  --bm-eng-text-secondary: #EFEFEF;  /* Blanc de Blanc */
  --bm-eng-border: rgba(155, 172, 216, 0.10);
  --bm-eng-glow: rgba(155, 172, 216, 0.15);
  --bm-eng-shadow: rgba(1, 17, 34, 0.50);
  --bm-eng-grid-line: rgba(155, 172, 216, 0.025);
  --bm-eng-radius: 18px;
  --bm-eng-transition: 0.4s ease-out;

  position: relative;
  z-index: 2;
  background-color: var(--bm-eng-bg);
  /* CRITICAL: overflow must NOT be hidden — it breaks position:sticky on children */
  overflow: visible;
  /* CRITICAL: overflow must NOT be hidden — it breaks position:sticky on children */
  overflow: visible;
}

/* Spacer no longer used — section itself is the scroll container */
.bm-eng-showcase__spacer {
  display: none;
}

/* ---- Sticky Wrapper ---- */
.bm-eng-showcase__sticky {
  position: relative;
  height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

/* ---- Blueprint Grid Overlay ---- */
.bm-eng-showcase__blueprint {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(var(--bm-eng-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--bm-eng-grid-line) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(
    ellipse at 65% 50%,
    black 20%,
    transparent 70%
  );
  -webkit-mask-image: radial-gradient(
    ellipse at 65% 50%,
    black 20%,
    transparent 70%
  );
}

/* ---- 2-Column Grid ---- */
.bm-eng-showcase__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 0.42fr 1fr;
  gap: 1.5rem;
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 3%;
  height: 85vh;
}

/* ============================================================
   LEFT PANEL
   ============================================================ */
.bm-eng-showcase__left {
  position: relative;
  background-color: var(--bm-eng-surface);
  border-radius: var(--bm-eng-radius);
  border: 1px solid var(--bm-eng-border);
  padding: 2rem 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
  box-shadow:
    0 0 0 1px var(--bm-eng-border),
    0 20px 60px var(--bm-eng-shadow);
}

/* ---- Progress Dots ---- */
.bm-eng-showcase__progress {
  position: absolute;
  top: 2rem;
  right: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 5;
}

.bm-eng-showcase__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: rgba(155, 172, 216, 0.35);
  transition: background-color var(--bm-eng-transition),
              box-shadow var(--bm-eng-transition);
}

.bm-eng-showcase__dot.is-active {
  background-color: var(--bm-eng-accent);
  box-shadow: 0 0 8px var(--bm-eng-glow);
}

/* ---- Content Panels ---- */
.bm-eng-showcase__panel {
  position: absolute;
  inset: 2rem 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--bm-eng-transition),
              transform var(--bm-eng-transition);
  pointer-events: none;
}

/* CSS fallback: show first panel immediately before JS initialises */
.bm-eng-showcase__panel[data-panel="0"] {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* Once JS has run, the above fallback is overridden by .is-active / no-class logic */
.bm-eng-showcase.js-ready .bm-eng-showcase__panel[data-panel="0"]:not(.is-active) {
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
}

.bm-eng-showcase__panel.is-active {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.bm-eng-showcase__panel-num {
  font-family: 'Inter', -apple-system, sans-serif;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--bm-eng-accent);
  opacity: 1;
  margin-bottom: 0.75rem;
  text-transform: uppercase;
}

.bm-eng-showcase__heading {
  font-family: 'Inter', -apple-system, sans-serif;
  font-size: clamp(1.5rem, 2.2vw, 1.875rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--bm-eng-text);
  margin: 0 0 1rem 0;
}

.bm-eng-showcase__accent {
  color: var(--bm-eng-accent);
}

.bm-eng-showcase__divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(
    90deg,
    var(--bm-eng-accent),
    transparent
  );
  opacity: 0.6;
  margin-bottom: 1rem;
}

.bm-eng-showcase__description {
  font-family: 'Inter', -apple-system, sans-serif;
  font-size: 0.95rem;
  font-weight: 400;
  line-height: 1.6;
  color: var(--bm-eng-text-secondary);
  margin: 0 0 1.25rem 0;
}

.bm-eng-showcase__specs {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.bm-eng-showcase__specs li {
  font-family: 'Inter', -apple-system, sans-serif;
  font-size: 0.85rem;
  color: rgba(242, 246, 252, 0.88);
  padding-left: 1.25rem;
  position: relative;
}

.bm-eng-showcase__specs li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background-color: var(--bm-eng-accent);
  opacity: 0.85;
}

/* ---- CTA ---- */
.bm-eng-showcase__cta-wrap {
  position: absolute;
  bottom: 2rem;
  left: 1.75rem;
  right: 1.75rem;
}

.bm-eng-showcase__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.35rem;
  border: 1px solid var(--bm-eng-accent);
  border-radius: 10px;
  color: var(--bm-eng-text);
  font-family: 'Inter', -apple-system, sans-serif;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  text-decoration: none;
  text-transform: uppercase;
  transition: background-color 0.35s ease,
              color 0.35s ease,
              box-shadow 0.35s ease;
}

.bm-eng-showcase__cta:hover {
  background-color: var(--bm-eng-accent);
  color: #020C1A;
  box-shadow: 0 0 24px var(--bm-eng-glow);
}

.bm-eng-showcase__cta-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
}

/* ============================================================
   RIGHT PANEL - Media Area
   ============================================================ */
.bm-eng-showcase__right {
  position: relative;
  border-radius: var(--bm-eng-radius);
  overflow: hidden;
  background-color: var(--bm-eng-surface);
  border: 1px solid var(--bm-eng-border);
  box-shadow:
    0 0 0 1px var(--bm-eng-border),
    0 20px 60px var(--bm-eng-shadow);
}

.bm-eng-showcase__media {
  position: absolute;
  inset: 0;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--bm-eng-transition),
              transform var(--bm-eng-transition);
  pointer-events: none;
}

.bm-eng-showcase__media.is-active {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* ---- Media Placeholders ---- */
.bm-eng-showcase__media-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  padding: 2rem;
  position: relative;
  overflow: hidden;
}

/* Subtle animated sheen on active media */
.bm-eng-showcase__media.is-active .bm-eng-showcase__media-placeholder::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    transparent 30%,
    rgba(155, 172, 216, 0.03) 50%,
    transparent 70%
  );
  animation: bm-sheen 8s ease-in-out infinite;
}

@keyframes bm-sheen {
  0%, 100% { transform: translateX(-30%); }
  50% { transform: translateX(30%); }
}

/* CAD placeholder */
.bm-eng-showcase__media-placeholder--cad {
  background:
    radial-gradient(ellipse at 30% 40%, rgba(155,172,216,0.08) 0%, transparent 60%),
    linear-gradient(160deg, #0B1215 0%, #020C1A 100%);
}

/* CNC placeholder */
.bm-eng-showcase__media-placeholder--cnc {
  background:
    radial-gradient(ellipse at 60% 30%, rgba(155,172,216,0.1) 0%, transparent 55%),
    linear-gradient(160deg, #0B1215 0%, #020C1A 100%);
}

/* Finishing placeholder */
.bm-eng-showcase__media-placeholder--finishing {
  background:
    radial-gradient(ellipse at 50% 50%, rgba(155,172,216,0.06) 0%, transparent 60%),
    linear-gradient(160deg, #0B1215 0%, #020C1A 100%);
}

/* Inspection placeholder */
.bm-eng-showcase__media-placeholder--inspection {
  background:
    radial-gradient(ellipse at 40% 35%, rgba(155,172,216,0.09) 0%, transparent 55%),
    linear-gradient(160deg, #0B1215 0%, #020C1A 100%);
}

.bm-eng-showcase__media-label {
  position: relative;
  z-index: 2;
  font-family: 'Inter', -apple-system, sans-serif;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(242, 246, 252, 0.85);
  background: rgba(11, 18, 21, 0.75);
  padding: 0.4rem 0.9rem;
  border-radius: 6px;
  border: 1px solid rgba(155, 172, 216, 0.25);
}

/* ---- Video element styling (when media is added) ---- */
.bm-eng-showcase__media-placeholder video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.bm-eng-showcase__media-placeholder img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .bm-eng-showcase__grid {
    grid-template-columns: 1fr;
    gap: 1rem;
    height: auto;
    padding: 1.5rem;
  }

  .bm-eng-showcase__left {
    min-height: 320px;
    padding: 1.5rem;
  }

  .bm-eng-showcase__panel {
    inset: 1.5rem;
  }

  .bm-eng-showcase__progress {
    top: 1.5rem;
    right: 1.5rem;
    flex-direction: row;
    gap: 8px;
  }

  .bm-eng-showcase__right {
    min-height: 280px;
  }

  .bm-eng-showcase__cta-wrap {
    bottom: 1.5rem;
    left: 1.5rem;
    right: 1.5rem;
  }
}

@media (max-width: 640px) {
  .bm-eng-showcase__spacer {
    height: 500vh;
  }

  .bm-eng-showcase__sticky {
    top: 0;
  }

  .bm-eng-showcase__grid {
    padding: 1rem;
    height: 92vh;
  }

  .bm-eng-showcase__left {
    min-height: 280px;
    padding: 1.25rem;
  }

  .bm-eng-showcase__panel {
    inset: 1.25rem;
  }

  .bm-eng-showcase__heading {
    font-size: 1.35rem;
  }

  .bm-eng-showcase__description {
    font-size: 0.85rem;
  }

  .bm-eng-showcase__specs li {
    font-size: 0.8rem;
  }

  .bm-eng-showcase__right {
    min-height: 220px;
  }

  .bm-eng-showcase__progress {
    top: 1.25rem;
    right: 1.25rem;
  }

  .bm-eng-showcase__cta-wrap {
    bottom: 1.25rem;
    left: 1.25rem;
    right: 1.25rem;
  }
}