/* ========================================
   产品中心 / 产品详情页样式
======================================== */

/* ---------- 页面横幅（复用 about） ---------- */
.page-hero {
  position: relative;
  height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  background: var(--color-primary);
}

.page-hero-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #0a2e5c 0%, #0d4a8a 50%, #0a2e5c 100%);
  background-size: cover;
  background-position: center;
}

.page-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10, 46, 92, 0.35) 0%, rgba(10, 46, 92, 0.15) 100%);
}

.page-hero-content {
  position: relative;
  z-index: 2;
  color: var(--color-white);
  padding-top: var(--header-h);
}

.page-hero-content .eyebrow {
  display: inline-block;
  font-size: 14px;
  letter-spacing: 0.2em;
  color: var(--color-accent-2);
  font-weight: 600;
  margin-bottom: 16px;
}

.page-hero-content h1 {
  font-size: 42px;
  color: var(--color-white);
  margin-bottom: 14px;
}

.page-hero-content p {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.85);
}

/* ---------- 分类 Tab ---------- */
.section-products-list {
  background: var(--color-bg);
  min-height: 60vh;
}

.category-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 48px;
  padding: 8px 0;
}

.category-tab {
  position: relative;
  padding: 10px 28px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-light);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 24px;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.category-tab:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.category-tab.is-active {
  background: var(--gradient-primary);
  color: var(--color-white);
  border-color: transparent;
  box-shadow: var(--shadow-accent);
}

/* ---------- 产品网格 ---------- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.product-card {
  display: flex;
  flex-direction: column;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all 0.4s var(--ease);
}

.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.product-cover {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--color-bg);
}

.product-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ease);
}

.product-card:hover .product-cover img {
  transform: scale(1.08);
}

.product-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(10, 46, 92, 0.3));
  opacity: 0;
  transition: opacity var(--transition);
}

.product-card:hover .product-cover::after {
  opacity: 1;
}

.product-body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.product-body h3 {
  font-size: 19px;
  margin-bottom: 10px;
  color: var(--color-primary);
  transition: color var(--transition);
}

.product-card:hover .product-body h3 {
  color: var(--color-accent);
}

.product-body p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 18px;
  flex: 1;
}

.product-body .text-link {
  align-self: flex-start;
}

/* 骨架屏卡片 */
.product-card.skeleton-card .product-cover,
.product-card.skeleton-card .sk-line {
  background: linear-gradient(90deg, #EEF2F7 25%, #F8FAFC 50%, #EEF2F7 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.4s infinite;
}

/* ---------- 产品详情头部 ---------- */
.section-product-head {
  background: var(--color-white);
  padding-top: 64px;
}

.product-detail-head {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

.pd-head-visual {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  aspect-ratio: 4 / 3;
  background: var(--color-bg);
}

.pd-head-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.pd-head-content .pd-category {
  display: inline-block;
  font-size: 13px;
  padding: 5px 14px;
  border-radius: 20px;
  background: rgba(0, 102, 255, 0.1);
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: 20px;
}

.pd-head-content h1 {
  font-size: 36px;
  margin-bottom: 20px;
  color: var(--color-primary);
  line-height: 1.3;
}

.pd-head-content .pd-summary {
  font-size: 16px;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 32px;
}

.pd-features-mini {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 36px;
}

.pd-feature-mini {
  display: flex;
  align-items: center;
  gap: 12px;
}

.pd-feature-mini .icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: rgba(0, 102, 255, 0.08);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.pd-feature-mini .icon svg {
  width: 20px;
  height: 20px;
}

.pd-feature-mini strong {
  display: block;
  font-size: 14px;
  color: var(--color-primary);
  font-weight: 600;
}

.pd-feature-mini span {
  font-size: 13px;
  color: var(--color-text-light);
}

.pd-head-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ---------- 产品内容布局 ---------- */
.section-product-content {
  background: var(--color-bg);
  padding-top: 0;
}

.product-detail-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 40px;
  align-items: start;
  margin-top: -40px;
}

.content-main {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 40px 44px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.content-section-nav {
  display: flex;
  gap: 8px;
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: var(--header-h);
  background: var(--color-white);
  z-index: 10;
  padding-top: 8px;
}

.content-section-nav a {
  padding: 8px 18px;
  font-size: 14px;
  color: var(--color-text-light);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  font-weight: 500;
}

.content-section-nav a:hover {
  color: var(--color-accent);
  background: rgba(0, 102, 255, 0.06);
}

.content-section-nav a.is-active {
  color: var(--color-white);
  background: var(--gradient-primary);
}

.content-aside {
  position: sticky;
  top: calc(var(--header-h) + 16px);
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.aside-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.aside-card h4 {
  font-size: 18px;
  margin-bottom: 12px;
  color: var(--color-primary);
}

.aside-card p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 20px;
  line-height: 1.7;
}

.aside-card .btn {
  width: 100%;
}

/* 相关产品 */
.related-item {
  display: flex;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition);
}

.related-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.related-item:first-child {
  padding-top: 0;
}

.related-item:hover h5 {
  color: var(--color-accent);
}

.related-item img {
  width: 72px;
  height: 54px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  flex-shrink: 0;
}

.related-item .related-body {
  flex: 1;
  min-width: 0;
}

.related-item h5 {
  font-size: 14px;
  color: var(--color-primary);
  margin-bottom: 4px;
  font-weight: 600;
  transition: color var(--transition);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.related-item p {
  font-size: 12px;
  color: var(--color-text-muted);
  margin: 0;
  -webkit-line-clamp: 2;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ========================================
   响应式
======================================== */
@media (max-width: 992px) {
  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .product-detail-head {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .product-detail-layout {
    grid-template-columns: 1fr;
    gap: 32px;
    margin-top: -32px;
  }

  .content-aside {
    position: static;
  }

  .content-main {
    padding: 32px 28px;
  }

  .pd-head-content h1 { font-size: 28px; }
}

@media (max-width: 768px) {
  .page-hero { height: 260px; }
  .page-hero-content h1 { font-size: 28px; }
  .page-hero-content p { font-size: 14px; }

  .product-grid {
    grid-template-columns: 1fr;
  }

  .category-tabs {
    gap: 8px;
  }

  .category-tab {
    padding: 8px 18px;
    font-size: 13px;
  }

  .content-main {
    padding: 24px 20px;
  }

  .content-section-nav {
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 12px;
    margin-bottom: 24px;
  }

  .content-section-nav a {
    flex-shrink: 0;
    padding: 6px 14px;
    font-size: 13px;
  }

  .pd-head-content h1 { font-size: 24px; }
  .pd-head-content .pd-summary { font-size: 14px; }

  .pd-features-mini {
    grid-template-columns: 1fr;
    gap: 12px;
  }
}