/* ==========================================================================
   PRODUCT DETAIL PAGES
   ========================================================================== */

/* --- Product Hero (full-image background) --- */
.product-hero {
  position: relative;
  min-height: 420px;
  display: flex;
  align-items: flex-end;
  padding: calc(var(--nav-h) + var(--sp-lg)) 0 var(--sp-xl);
  background-size: cover;
  background-position: center;
  overflow: hidden;
}

.product-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(0deg, rgba(17,29,48,0.92) 0%, rgba(17,29,48,0.55) 50%, rgba(17,29,48,0.3) 100%);
  z-index: 1;
}

.product-hero .container { position: relative; z-index: 2; }

.product-hero__back {
  display: inline-flex;
  align-items: center;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: rgba(255,255,255,0.6);
  margin-bottom: var(--sp-lg);
  transition: color 0.3s var(--ease-out);
}
.product-hero__back:hover { color: var(--c-white); }

.product-hero__grid {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: var(--sp-lg);
}

.product-hero__content { max-width: 640px; }

.product-hero__index {
  display: inline-block;
  font-size: var(--fs-xs);
  font-weight: 700;
  color: rgba(255,255,255,0.5);
  letter-spacing: 0.05em;
  margin-bottom: var(--sp-sm);
}

.product-hero__title {
  font-size: var(--fs-xl);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--c-white);
  margin-bottom: var(--sp-md);
}

.product-hero__lead {
  font-size: var(--fs-md);
  color: rgba(255,255,255,0.75);
  line-height: 1.6;
}

.product-hero__icon { display: none; }

@media (min-width: 768px) {
  .product-hero { min-height: 480px; }
}

/* --- Product Detail Grid --- */
.product-detail__grid {
  display: grid;
  gap: var(--sp-xl);
}

@media (min-width: 768px) {
  .product-detail__grid {
    grid-template-columns: 1.5fr 1fr;
    gap: var(--sp-xxl);
    align-items: start;
  }
}

.product-detail__main h2 {
  font-size: var(--fs-lg);
  font-weight: 700;
  color: var(--c-accent);
  margin-top: var(--sp-lg);
  margin-bottom: var(--sp-sm);
  line-height: 1.2;
}

.product-detail__main h2:first-child {
  margin-top: 0;
}

.product-detail__main p {
  font-size: var(--fs-base);
  color: var(--c-text-muted);
  line-height: 1.7;
  margin-bottom: var(--sp-sm);
}

/* Feature list */
.product-detail__features {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--sp-md);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.product-detail__features li {
  position: relative;
  padding-left: 1.4rem;
  font-size: var(--fs-sm);
  color: var(--c-text);
  line-height: 1.5;
}

.product-detail__features li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent, var(--c-accent-warm));
}

/* Type cards (gearboxes page) */
.product-detail__types {
  display: grid;
  gap: var(--sp-sm);
  margin: var(--sp-md) 0;
}

@media (min-width: 600px) {
  .product-detail__types {
    grid-template-columns: 1fr 1fr;
  }
}

.product-detail__type {
  padding: var(--sp-md);
  background: var(--c-bg);
  border: 1px solid var(--c-border-light);
  border-radius: var(--radius-sm);
}

.product-detail__type h3 {
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--c-accent);
  margin-bottom: 0.35rem;
}

.product-detail__type p {
  font-size: var(--fs-xs);
  color: var(--c-text-muted);
  line-height: 1.5;
  margin: 0;
}

/* --- Sidebar --- */
.product-detail__sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--sp-sm);
  position: sticky;
  top: calc(var(--nav-h) + var(--sp-lg));
}

.product-detail__card {
  background: var(--c-bg);
  border: 1px solid var(--c-border-light);
  border-radius: var(--radius);
  padding: var(--sp-lg);
}

.product-detail__card h3 {
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-accent-warm);
  margin-bottom: var(--sp-md);
}

.product-detail__specs {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.5rem 1rem;
}

.product-detail__specs dt {
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--c-text);
}

.product-detail__specs dd {
  font-size: var(--fs-xs);
  color: var(--c-text-muted);
  margin: 0;
}

/* --- Related Products --- */
.related {
  background: var(--c-surface);
}

.related .section__title {
  margin-bottom: var(--sp-lg);
}

.related__grid {
  display: flex;
  flex-direction: column;
}

.related__item {
  display: flex;
  align-items: center;
  gap: var(--sp-md);
  padding: var(--sp-md) 0;
  border-bottom: 1px solid var(--c-border-light);
  transition: padding-left 0.3s var(--ease-out);
}

.related__item:first-child {
  border-top: 1px solid var(--c-border-light);
}

.related__item:hover {
  padding-left: var(--sp-sm);
}

.related__num {
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--c-accent-warm);
  min-width: 28px;
}

.related__name {
  flex: 1;
  font-size: var(--fs-md);
  font-weight: 600;
  color: var(--c-accent);
}

.related__arrow {
  font-size: var(--fs-md);
  color: var(--c-text-muted);
  transition: transform 0.3s var(--ease-out);
}

.related__item:hover .related__arrow {
  transform: translateX(4px);
}