/* ============================================================
   pages/product.css — Product Detail Page
   ============================================================ */

/* ── Breadcrumb ───────────────────────────────────────────── */
.breadcrumb {
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--clr-border);
  background: var(--clr-bg-2);
}
.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}
.breadcrumb-list li {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.breadcrumb-list li + li::before {
  content: '/';
  color: var(--clr-text-dim);
  font-size: 0.75rem;
}
.breadcrumb-list a,
.breadcrumb-list span {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--clr-text-dim);
  transition: color var(--transition);
}
.breadcrumb-list a:hover { color: var(--clr-white); }
.breadcrumb-list li:last-child span { color: var(--clr-red); }

/* ── Product Layout ───────────────────────────────────────── */
.product-detail {
  padding: var(--space-16) 0 var(--space-24);
}
.product-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: start;
}

/* ── Carousel ─────────────────────────────────────────────── */
.carousel {
  position: sticky;
  top: calc(64px + var(--space-8));
}
.carousel-stage {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  aspect-ratio: 4/3;
}
.carousel-track {
  display: flex;
  height: 100%;
  transition: transform 0.45s var(--ease-out);
  will-change: transform;
}
.carousel-slide {
  flex: 0 0 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--clr-bg-3);
  position: relative;
  overflow: hidden;
}
.carousel-slide img {
  width: 100%; height: 100%;
  object-fit: cover;
}

/* Slide placeholder */
.carousel-placeholder {
  width: 100%; height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-5);
  background: linear-gradient(145deg, #121212 0%, #1c1c1c 100%);
  position: relative;
}
.carousel-placeholder::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 24px 24px;
}
.carousel-placeholder-model {
  position: relative;
  z-index: 1;
  font-family: var(--font-display);
  font-size: clamp(4rem, 10vw, 7rem);
  font-weight: 800;
  color: rgba(255,255,255,0.05);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  line-height: 1;
}
.carousel-placeholder-glow {
  position: absolute;
  width: 200px; height: 200px;
  background: radial-gradient(circle, rgba(212,43,43,0.2) 0%, transparent 70%);
  border-radius: 50%;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
}
.carousel-placeholder-label {
  position: relative;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--clr-text-dim);
}

/* Slide counter */
.carousel-counter {
  position: absolute;
  bottom: var(--space-4);
  right: var(--space-5);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.5);
  background: rgba(0,0,0,0.5);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  pointer-events: none;
}

/* Prev / Next buttons */
.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 40px; height: 40px;
  background: rgba(0,0,0,0.6);
  border: 1px solid var(--clr-border-hi);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
  z-index: 5;
}
.carousel-btn:hover {
  background: rgba(212,43,43,0.3);
  border-color: var(--clr-red);
}
.carousel-btn svg {
  width: 18px; height: 18px;
  stroke: var(--clr-white);
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.carousel-btn--prev { left: var(--space-3); }
.carousel-btn--next { right: var(--space-3); }

/* Thumbnail dots */
.carousel-dots {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  margin-top: var(--space-4);
}
.carousel-dot {
  width: 28px; height: 3px;
  background: var(--clr-border-hi);
  border-radius: 2px;
  cursor: pointer;
  transition: background var(--transition), width var(--transition);
  border: none;
  padding: 0;
}
.carousel-dot.is-active {
  background: var(--clr-red);
  width: 44px;
}

/* Thumbnail strip */
.carousel-thumbs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3);
  margin-top: var(--space-3);
}
.carousel-thumb {
  aspect-ratio: 1;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  transition: border-color var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
}
.carousel-thumb.is-active { border-color: var(--clr-red); }
.carousel-thumb:hover     { border-color: var(--clr-border-hi); }
.carousel-thumb-inner {
  width: 100%; height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--clr-bg-3);
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--clr-text-dim);
  text-transform: uppercase;
}
.carousel-thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
}

/* ── Product Info Panel ───────────────────────────────────── */
.product-info { display: flex; flex-direction: column; gap: var(--space-8); }

.product-info-header { display: flex; flex-direction: column; gap: var(--space-3); }

.product-badges {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  align-items: center;
}
.product-model-tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--clr-red);
}
.product-cert-badge {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  color: var(--clr-text-dim);
  border: 1px solid var(--clr-border);
  padding: 2px 7px;
  border-radius: var(--radius-sm);
}
.product-cert-badge--hi {
  border-color: rgba(212,43,43,0.4);
  color: var(--clr-red);
}

.product-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  line-height: 1;
  margin: 0;
}
.product-tagline {
  font-size: 1rem;
  color: var(--clr-text);
  line-height: 1.65;
  margin: 0;
}

/* Price block */
.product-price-block {
  display: flex;
  align-items: flex-end;
  gap: var(--space-4);
  padding: var(--space-6);
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
}
.product-price-amount {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--clr-white);
  line-height: 1;
}
.product-price-meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-bottom: 3px;
}
.product-price-label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-text-dim);
}
.product-price-moq {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--clr-text-dim);
  letter-spacing: 0.05em;
}

/* Key stats row */
.product-key-specs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--clr-border);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.key-spec-cell {
  background: var(--clr-bg-3);
  padding: var(--space-4) var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.key-spec-label {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--clr-text-dim);
}
.key-spec-value {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--clr-white);
  text-transform: uppercase;
}

/* Description */
.product-description h3 {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  letter-spacing: 0.12em;
  color: var(--clr-text-dim);
  text-transform: uppercase;
  margin-bottom: var(--space-4);
}
.product-description p {
  font-size: 0.925rem;
  color: var(--clr-text);
  line-height: 1.75;
  margin-bottom: var(--space-4);
}

/* CTA block */
.product-cta {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-6);
  background: var(--clr-red-dim);
  border: 1px solid rgba(212,43,43,0.3);
  border-radius: var(--radius-md);
}
.product-cta-heading {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--clr-white);
}
.product-cta-actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}
.product-cta-note {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  color: var(--clr-text-dim);
  text-transform: uppercase;
}

/* ── Tabs (Specs / FAQ) ───────────────────────────────────── */
.product-tabs { margin-top: var(--space-16); }

.tabs-nav {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--clr-border);
  margin-bottom: var(--space-10);
}
.tab-btn {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--clr-text-dim);
  padding: var(--space-4) var(--space-8);
  border: none;
  border-bottom: 2px solid transparent;
  background: none;
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition);
  margin-bottom: -1px;
}
.tab-btn:hover   { color: var(--clr-white); }
.tab-btn.is-active {
  color: var(--clr-white);
  border-bottom-color: var(--clr-red);
}
.tab-panel { display: none; }
.tab-panel.is-active { display: block; }

/* ── Specs Table ──────────────────────────────────────────── */
.specs-table-wrap { overflow-x: auto; }
.specs-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
.specs-table caption {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--clr-text-dim);
  text-align: left;
  padding-bottom: var(--space-5);
}
.specs-table tbody tr {
  border-bottom: 1px solid var(--clr-border);
  transition: background var(--transition);
}
.specs-table tbody tr:last-child { border-bottom: none; }
.specs-table tbody tr:hover { background: rgba(255,255,255,0.025); }
.specs-table td {
  padding: var(--space-4) var(--space-5);
  vertical-align: top;
}
.specs-table td:first-child {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--clr-text-dim);
  white-space: nowrap;
  width: 35%;
}
.specs-table td:last-child {
  color: var(--clr-white);
  font-size: 0.875rem;
  font-weight: 500;
}

/* Spec groups */
.spec-group-header td {
  padding-top: var(--space-6);
  padding-bottom: var(--space-2);
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-red) !important;
  border-bottom: 1px solid var(--clr-border) !important;
  background: none !important;
}
.spec-group-header:first-child td { padding-top: 0; }

/* ── FAQ ──────────────────────────────────────────────────── */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-width: 800px;
}
.faq-item {
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition);
}
.faq-item.is-open { border-color: var(--clr-border-hi); }
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  padding: var(--space-5) var(--space-6);
  background: var(--clr-surface);
  text-align: left;
  cursor: pointer;
  transition: background var(--transition);
  border: none;
}
.faq-question:hover { background: var(--clr-bg-3); }
.faq-question-text {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--clr-white);
  line-height: 1.3;
}
.faq-icon {
  flex-shrink: 0;
  width: 24px; height: 24px;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  transition: background var(--transition), border-color var(--transition),
              transform 0.3s var(--ease-out);
}
.faq-item.is-open .faq-icon {
  background: var(--clr-red-dim);
  border-color: var(--clr-red);
  transform: rotate(45deg);
}
.faq-icon svg {
  width: 12px; height: 12px;
  stroke: var(--clr-text);
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
}
.faq-item.is-open .faq-icon svg { stroke: var(--clr-red); }

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s var(--ease-out), padding 0.25s var(--ease-out);
  background: var(--clr-bg-3);
}
.faq-item.is-open .faq-answer { max-height: 400px; }
.faq-answer-inner {
  padding: var(--space-5) var(--space-6) var(--space-6);
  font-size: 0.9rem;
  color: var(--clr-text);
  line-height: 1.75;
  border-top: 1px solid var(--clr-border);
}

/* ── Related Products ─────────────────────────────────────── */
.related-section {
  padding: var(--space-16) 0;
  border-top: 1px solid var(--clr-border);
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-10);
}

/* ── Error State ──────────────────────────────────────────── */
.error-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-32) var(--container-pad);
  gap: var(--space-6);
}
.error-code {
  font-family: var(--font-display);
  font-size: 6rem;
  font-weight: 800;
  color: rgba(255,255,255,0.04);
  line-height: 1;
  letter-spacing: -0.04em;
}
.error-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--clr-white);
}
.error-sub {
  font-size: 0.9rem;
  color: var(--clr-text-dim);
  max-width: 40ch;
  line-height: 1.7;
  margin: 0;
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 1024px) {
  .product-layout { grid-template-columns: 1fr; gap: var(--space-10); }
  .carousel { position: static; }
  .related-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .product-key-specs { grid-template-columns: 1fr 1fr; }
  .tabs-nav { overflow-x: auto; }
  .tab-btn { padding: var(--space-3) var(--space-5); white-space: nowrap; }
  .product-cta-actions { flex-direction: column; }
  .product-cta-actions .btn { width: 100%; justify-content: center; }
  .related-grid { grid-template-columns: 1fr; }
  .carousel-thumbs { grid-template-columns: repeat(4, 1fr); }
}