/* ============ 产品中心系列专属样式 ============ */

/* 产品页横幅 - 渐变彩色横幅 */
.product-banner {
  position: relative;
  padding: 7rem 2rem 4rem;
  background: linear-gradient(135deg, #B91C1C 0%, #7F1D1D 100%);
  color: #fff;
  overflow: hidden;
}
.product-banner::before {
  content: 'PRODUCTS';
  position: absolute;
  right: 2rem; bottom: -2rem;
  font-family: var(--font-serif);
  font-size: 10rem;
  color: rgba(255,255,255,0.06);
  font-weight: 900;
  letter-spacing: 0.05em;
}
.product-banner-inner {
  max-width: 1320px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}
.product-banner h1 {
  font-family: var(--font-serif);
  font-size: 2.8rem;
  margin-bottom: 0.6rem;
}
.product-banner .breadcrumb {
  font-size: 0.9rem;
  opacity: 0.8;
}
.product-banner .breadcrumb a:hover { text-decoration: underline; }
.product-banner .breadcrumb span { margin: 0 0.5rem; }

/* 产品总览 - 大分类网格 */
.product-categories {
  padding: 5rem 2rem;
  background: var(--color-cream);
}
.product-cat-grid {
  max-width: 1320px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}
.product-cat-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-paper);
  box-shadow: var(--shadow-sm);
  transition: all 0.4s cubic-bezier(0.16,1,0.3,1);
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 280px;
  scroll-margin-top: 110px;
}
.product-cat-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.product-cat-card-img {
  background-size: cover;
  background-position: center;
  position: relative;
}
.product-cat-card-img::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(185,28,28,0.1), transparent);
}
.product-cat-card-body {
  padding: 2.5rem 2rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.product-cat-card-body .cat-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-primary);
  letter-spacing: 0.2em;
  margin-bottom: 0.8rem;
  font-weight: 700;
}
.product-cat-card-body h3 {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  margin-bottom: 0.8rem;
  color: var(--color-ink);
}
.product-cat-card-body p {
  font-size: 0.92rem;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 1.2rem;
  flex-grow: 1;
}
.product-cat-card-body .specs {
  display: flex;
  gap: 1.2rem;
  flex-wrap: wrap;
  margin-bottom: 1.2rem;
}
.product-cat-card-body .spec {
  font-size: 0.78rem;
  color: var(--color-slate);
  background: var(--color-sand);
  padding: 0.3rem 0.8rem;
  border-radius: 50px;
}
.product-cat-card-body .more {
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: gap 0.2s;
}
.product-cat-card:hover .more { gap: 0.8rem; }

/* ===== 产品详情页 - 左图右文 + 规格表 ===== */
.product-detail-hero {
  padding: 6rem 2rem 4rem;
  background: var(--color-cream);
}
.product-detail-hero-inner {
  max-width: 1320px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}
.product-detail-img {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-paper);
  box-shadow: var(--shadow-lg);
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.product-detail-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.product-detail-img .floating-tag {
  position: absolute;
  top: 1.5rem; left: 1.5rem;
  background: var(--color-primary);
  color: #fff;
  padding: 0.5rem 1.2rem;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  box-shadow: var(--shadow-red);
}
.product-detail-info .pdt-cat {
  color: var(--color-primary);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  margin-bottom: 0.8rem;
}
.product-detail-info h1 {
  font-family: var(--font-serif);
  font-size: 2.6rem;
  margin-bottom: 0.5rem;
  color: var(--color-ink);
}
.product-detail-info .en-name {
  font-size: 1rem;
  color: var(--color-stone);
  letter-spacing: 0.1em;
  margin-bottom: 1.5rem;
}
.product-detail-info .desc {
  color: var(--color-slate);
  line-height: 1.9;
  margin-bottom: 1.5rem;
  font-size: 1rem;
}
.product-detail-info .key-points {
  margin-bottom: 2rem;
}
.product-detail-info .key-points li {
  display: flex;
  align-items: flex-start;
  gap: 0.8rem;
  margin-bottom: 0.8rem;
  font-size: 0.95rem;
  color: var(--color-ink);
}
.product-detail-info .key-points li::before {
  content: '✓';
  color: var(--color-primary);
  font-weight: 700;
  flex-shrink: 0;
}
.product-detail-info .actions { display: flex; gap: 1rem; flex-wrap: wrap; }

/* 规格表 */
.product-specs {
  padding: 4rem 2rem;
  background: var(--color-paper);
}
.product-specs-inner {
  max-width: 1100px;
  margin: 0 auto;
}
.specs-title {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  margin-bottom: 2rem;
  text-align: center;
  position: relative;
}
.specs-title::after {
  content: '';
  display: block;
  width: 50px; height: 3px;
  background: var(--color-primary);
  margin: 0.8rem auto 0;
}
.spec-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-paper);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.spec-table tr {
  border-bottom: 1px solid var(--color-mist);
}
.spec-table tr:last-child { border-bottom: none; }
.spec-table tr:hover { background: var(--color-sand); }
.spec-table td {
  padding: 1rem 1.5rem;
  font-size: 0.92rem;
}
.spec-table td:first-child {
  width: 35%;
  color: var(--color-text-light);
  background: var(--color-sand);
  font-weight: 600;
}
.spec-table td:last-child {
  color: var(--color-ink);
  font-weight: 500;
}

/* 特性展示 */
.product-features-section {
  padding: 5rem 2rem;
  background: var(--color-cream);
}
.product-features-inner {
  max-width: 1320px;
  margin: 0 auto;
}
.product-features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}
.pf-card {
  background: var(--color-paper);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}
.pf-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 4px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s;
}
.pf-card:hover::before { transform: scaleX(1); }
.pf-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.pf-card .pf-num {
  font-family: var(--font-serif);
  font-size: 3rem;
  font-weight: 900;
  color: var(--color-primary);
  opacity: 0.15;
  position: absolute;
  top: 1rem; right: 1.5rem;
  line-height: 1;
}
.pf-card .pf-icon {
  font-size: 2.2rem;
  margin-bottom: 1rem;
}
.pf-card h4 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  margin-bottom: 0.6rem;
}
.pf-card p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.8;
}

/* 应用场景 */
.product-application {
  padding: 5rem 2rem;
  background: var(--color-ink);
  color: #fff;
}
.product-application-inner {
  max-width: 1320px;
  margin: 0 auto;
}
.product-application h2 {
  font-family: var(--font-serif);
  font-size: 2rem;
  margin-bottom: 0.5rem;
  text-align: center;
}
.product-application .subtitle {
  text-align: center;
  color: rgba(255,255,255,0.6);
  margin-bottom: 3rem;
}
.app-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}
.app-item {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-md);
  padding: 1.8rem 1.2rem;
  text-align: center;
  transition: all 0.3s;
}
.app-item:hover {
  background: rgba(185,28,28,0.2);
  border-color: var(--color-primary);
  transform: translateY(-4px);
}
.app-item .icon {
  font-size: 2.5rem;
  margin-bottom: 0.8rem;
}
.app-item h5 {
  font-size: 1rem;
  margin-bottom: 0.4rem;
}
.app-item p {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.6);
}

/* 相关产品 */
.related-products {
  padding: 5rem 2rem;
  background: var(--color-cream);
}
.related-products h2 {
  font-family: var(--font-serif);
  font-size: 2rem;
  text-align: center;
  margin-bottom: 3rem;
}
.related-grid {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.related-card {
  background: var(--color-paper);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s;
  display: block;
}
.related-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.related-card-img {
  height: 160px;
  background-size: cover;
  background-position: center;
}
.related-card-body { padding: 1.2rem; }
.related-card-body h4 { font-size: 1.05rem; margin-bottom: 0.3rem; }
.related-card-body p { font-size: 0.82rem; color: var(--color-text-light); }

@media (max-width: 1024px) {
  .product-cat-card { grid-template-columns: 1fr; }
  .product-cat-card-img { height: 200px; }
  .product-detail-hero-inner { grid-template-columns: 1fr; }
  .product-features-grid, .app-grid { grid-template-columns: repeat(2,1fr); }
  .related-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .product-cat-grid, .product-features-grid, .app-grid, .related-grid { grid-template-columns: 1fr; }
  .product-banner h1, .product-detail-info h1 { font-size: 2rem; }
}