/* ============================================================
   产品技术详情页 /products/{slug}
   沿用 site.css 的品牌变量；所有类以 pf- 开头，不影响其他页面。
   ============================================================ */

:root { --pf-nav-h: 52px; }

/* 锚点跳转时不被固定页头 + 吸顶导航挡住 */
.pf-section,
#quote { scroll-margin-top: calc(var(--header-h) + var(--pf-nav-h) + 16px); }

/* ─── Hero ───────────────────────────────────────────── */
.pf-hero { padding-bottom: 5.5rem; }
.pf-hero h1 { margin-top: .5rem; }
.pf-category {
  display: inline-block;
  margin-top: 1.25rem;
  padding: .2rem .75rem;
  border: 1px solid rgba(255,255,255,.25);
  border-radius: 999px;
  font-size: .8rem;
  color: rgba(255,255,255,.8);
}
.pf-hero .pf-name-en { margin-top: .25rem; font-size: .95rem; }
.pf-hero .pf-cas {
  margin-top: .75rem;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.2vw, 2.6rem);
  font-weight: 300;
  line-height: 1.1;
  color: #fff;
  font-variant-numeric: tabular-nums;
}
.pf-cas span { margin-right: .6rem; font-size: .9rem; font-weight: 600; color: var(--y-400); letter-spacing: .05em; }
.pf-hero .pf-summary { max-width: 64ch; margin-top: 1rem; font-size: 1.05rem; line-height: 1.75; color: rgba(255,255,255,.88); }
.pf-actions { display: flex; flex-wrap: wrap; align-items: center; gap: .75rem 1rem; margin-top: 1.5rem; }
.pf-btn-ghost { border: 1.5px solid rgba(255,255,255,.55); color: #fff; font-weight: 500; border-radius: var(--radius-sm); }
.pf-btn-ghost:hover { background: rgba(255,255,255,.12); color: #fff; }
.pf-link { color: rgba(255,255,255,.8); font-size: .95rem; }
.pf-link:hover { color: #fff; }

.pf-draft {
  display: inline-block;
  margin-top: 1rem;
  padding: .35rem .8rem;
  border-radius: var(--radius-sm);
  background: var(--y-500);
  color: var(--y-900);
  font-size: .85rem;
  font-weight: 600;
}

.pf-structure {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 220px;
  margin: 0;
  padding: 1rem;
  border-radius: var(--radius-md);
  background: #fff;
  box-shadow: var(--shadow-lg);
}
.pf-structure img { display: block; max-width: 100%; height: auto; max-height: 240px; width: auto; }
.pf-structure figcaption { margin-top: .5rem; font-size: .85rem; color: var(--text-muted); text-align: center; }
.pf-structure--empty { min-height: 120px; }

/* ─── 关键参数条（压在 hero 底部波浪上）──────────────── */
.pf-keyfacts {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  margin: -3rem 0 0;
  border-radius: var(--radius-md);
  background: #fff;
  box-shadow: var(--shadow-md);
  overflow: hidden;
}
.pf-keyfacts > div { padding: 1rem 1.25rem; border-right: 1px solid var(--border-color); }
.pf-keyfacts > div:last-child { border-right: 0; }
.pf-keyfacts dt { font-size: .75rem; font-weight: 500; color: var(--text-muted); text-transform: uppercase; letter-spacing: .04em; }
.pf-keyfacts dd { margin: .15rem 0 0; font-weight: 600; color: var(--text-primary); overflow-wrap: anywhere; }

/* ─── 吸顶页内导航 ──────────────────────────────────── */
.pf-nav {
  position: sticky;
  top: var(--header-h);
  z-index: 100;
  margin-top: 2rem;
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
}
.pf-nav .container { display: flex; align-items: center; gap: 1rem; height: var(--pf-nav-h); }
.pf-nav ul {
  display: flex;
  flex: 1;
  gap: .25rem;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}
.pf-nav ul::-webkit-scrollbar { display: none; }
.pf-nav li { flex: none; }
.pf-nav ul a {
  display: block;
  padding: .4rem .85rem;
  border-radius: 999px;
  font-size: .9rem;
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
}
.pf-nav ul a:hover { background: var(--g-50); color: var(--brand-primary); }
.pf-nav ul a.active { background: var(--g-100); color: var(--brand-primary); }
.pf-nav-cta {
  flex: none;
  padding: .4rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--brand-primary);
  color: #fff;
  font-size: .875rem;
  font-weight: 600;
  white-space: nowrap;
}
.pf-nav-cta:hover { background: var(--brand-secondary); color: #fff; }

/* ─── 正文章节 ──────────────────────────────────────── */
.pf-body { padding-top: 1rem; padding-bottom: 5rem; }
.pf-section { padding: 2.5rem 0; border-bottom: 1px solid var(--border-color); }
.pf-section:last-child { border-bottom: 0; }
.pf-section > h2 { margin-bottom: 1.25rem; font-size: 1.6rem; }
.pf-section h3 { margin: 1.75rem 0 .75rem; font-size: 1.1rem; }
.pf-section > h2 + h3 { margin-top: 0; }
.pf-section p { max-width: 75ch; color: var(--text-secondary); }
.pf-section p + p { margin-top: .9rem; }

.pf-scroll { overflow-x: auto; }
.pf-table { width: 100%; border-collapse: collapse; font-size: .95rem; }
.pf-table caption { caption-side: bottom; padding-top: .75rem; font-size: .85rem; color: var(--text-muted); }
.pf-table th, .pf-table td { padding: .6rem 1rem .6rem 0; vertical-align: top; text-align: left; border-bottom: 1px solid var(--border-color); }
.pf-table tbody th { width: 34%; font-weight: 400; color: var(--text-muted); }
.pf-table tr:last-child > * { border-bottom: 0; }
.pf-table--grid thead th { font-weight: 600; border-bottom: 2px solid var(--brand-primary); }
.pf-table--grid tbody tr:last-child > * { border-bottom: 1px solid var(--border-color); }
.pf-code { font-family: Consolas, Menlo, monospace; font-size: .85rem; overflow-wrap: anywhere; }

.pf-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; margin-top: 1.25rem; }
.pf-card { padding: 1.25rem; border: 1px solid var(--border-color); border-radius: var(--radius-md); background: var(--bg-light); }
.pf-section .pf-card h3 { margin: 0 0 .5rem; font-size: 1rem; color: var(--brand-primary); }
.pf-card p { margin: 0; font-size: .95rem; }

.pf-docs { display: grid; gap: .75rem; margin: 1.25rem 0 1.5rem; padding: 0; list-style: none; }
.pf-docs li { display: flex; gap: .85rem; align-items: flex-start; }
.pf-docs i { font-size: 1.3rem; color: var(--brand-secondary); line-height: 1.4; }
.pf-docs strong { display: block; }
.pf-docs span { font-size: .9rem; color: var(--text-muted); }

.pf-note { margin-top: 1rem; font-size: .9rem; }

.pf-faq-item { padding: 1.1rem 0; border-bottom: 1px dashed var(--border-color); }
.pf-faq-item:first-child { padding-top: 0; }
.pf-faq-item:last-child { border-bottom: 0; }
.pf-section .pf-faq-item h3 { margin: 0 0 .4rem; font-size: 1.02rem; }
.pf-faq-item p { margin: 0; }

.pf-related {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: .9rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: var(--trans);
}
.pf-related:hover { border-color: var(--brand-secondary); box-shadow: var(--shadow-sm); }
.pf-related-img {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 120px;
  margin-bottom: .75rem;
  border-radius: var(--radius-sm);
  background: #fff;
  overflow: hidden;
}
.pf-related-img img { max-width: 100%; max-height: 100%; object-fit: contain; }
.pf-related-img i { font-size: 2rem; color: var(--text-muted); }
.pf-related-name { font-weight: 600; color: var(--text-primary); }
.pf-related-cas { font-size: .85rem; color: var(--text-muted); }

.pf-quote { margin-top: 2rem; padding: 2rem; border: 0; border-radius: var(--radius-lg); background: var(--g-50); }
.pf-reviewed { margin-top: 1.5rem; font-size: .85rem; color: var(--text-muted) !important; }

/* ─── 侧栏 ──────────────────────────────────────────── */
.pf-aside {
  position: sticky;
  top: calc(var(--header-h) + var(--pf-nav-h) + 24px);
  margin-top: 2.5rem;
  padding: 1.25rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: #fff;
  box-shadow: var(--shadow-sm);
}
.pf-aside-title { font-weight: 700; line-height: 1.35; }
.pf-aside-cas { margin-top: .25rem; font-size: .9rem; color: var(--text-muted); }
.pf-aside-link { display: block; margin-top: .9rem; font-size: .875rem; text-align: center; }

@media (max-width: 767.98px) {
  .pf-nav-cta { display: none; }
  .pf-keyfacts > div { border-right: 0; border-bottom: 1px solid var(--border-color); }
  .pf-table tbody th { width: 40%; }
  .pf-quote { padding: 1.5rem 1.25rem; }
}