/* =========================================================================
   液冷连接器选型标准库 · 独立设计体系（本站原创，不与其他子域共享）
   风格：高端科技风 / 玻璃拟态 Glassmorphism / 冷色科技蓝青 / 数据中心精密感
   CSS 变量驱动，含面包屑 --h2-inset 对齐控制
   ========================================================================= */
:root {
  --bg-0: #070C16;
  --bg-1: #0B1220;
  --bg-2: #0F1B2D;
  --panel: rgba(20, 32, 52, 0.55);
  --panel-solid: #111C30;
  --border: rgba(120, 170, 255, 0.16);
  --border-strong: rgba(0, 224, 198, 0.4);
  --text-0: #E8F0FF;
  --text-1: #AFC4E0;
  --text-2: #6E86A8;
  --primary: #1565FF;
  --primary-2: #0B8CFF;
  --cyan: #00E0C6;
  --cyan-soft: rgba(0, 224, 198, 0.12);
  --warn: #FFB020;
  --danger: #FF5C5C;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
  --glow: 0 0 40px rgba(0, 224, 198, 0.18);
  --maxw: 1200px;
  --h2-inset: 16px; /* 文章/列表/产品页面包屑左缘对齐 H2 */
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  color: var(--text-0);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(21, 101, 255, 0.18), transparent 60%),
    radial-gradient(900px 500px at 0% 10%, rgba(0, 224, 198, 0.12), transparent 55%),
    linear-gradient(180deg, var(--bg-1), var(--bg-0));
  background-attachment: fixed;
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--cyan); text-decoration: none; transition: color .2s; }
a:hover { color: #5cffe6; }
img { max-width: 100%; }

/* ---------- 容器 ---------- */
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ---------- 顶部固定玻璃导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  background: rgba(7, 12, 22, 0.62);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--text-0); }
.brand .logo-dot {
  width: 26px; height: 26px; border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), var(--cyan));
  box-shadow: var(--glow);
}
.nav-links { display: flex; gap: 6px; align-items: center; }
.nav-links a {
  color: var(--text-1); padding: 8px 14px; border-radius: 999px; font-size: 15px;
}
.nav-links a:hover, .nav-links a.active { color: var(--text-0); background: var(--cyan-soft); }
.nav-toggle { display: none; background: none; border: 1px solid var(--border); color: var(--text-0);
  border-radius: 10px; padding: 8px 12px; cursor: pointer; }

/* 移动端折叠菜单 */
@media (max-width: 860px) {
  .nav-links { display: none; position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; gap: 0; background: rgba(7,12,22,0.96); padding: 8px 12px;
    border-bottom: 1px solid var(--border); }
  .nav-links.open { display: flex; }
  .nav-toggle { display: inline-block; }
}

/* ---------- 面包屑（左缘与 H2 严格对齐）---------- */
.breadcrumb {
  padding: 18px 0 10px;
  font-size: 13.5px; color: var(--text-2);
  /* 关键：左缘与正文 H2 文字左缘一致 */
  padding-left: var(--h2-inset);
}
.breadcrumb a { color: var(--text-2); }
.breadcrumb a:hover { color: var(--cyan); }
.breadcrumb .sep { margin: 0 8px; color: var(--text-2); opacity: .6; }
.breadcrumb .cur { color: var(--text-1); }

/* ---------- 布局栅格 ---------- */
.article-layout, .list-layout, .page-wrap {
  max-width: var(--maxw); margin: 0 auto; padding: 0 20px 60px;
  position: relative;
}
.page-wrap { --h2-inset: 48px; }
/* 详情页栅格：左正文 + 右悬浮 TOC（详情容器内的子网格，面包屑为其同级全宽子元素） */
.article-grid { display: grid; grid-template-columns: minmax(0, 1fr) 240px; gap: 32px; align-items: start; }
@media (max-width: 1024px) {
  .article-grid { grid-template-columns: 1fr; }
  .toc-aside { display: none; }
}

/* ---------- 文章正文 ---------- */
.article-main { min-width: 0; }
.article-main h1 {
  font-size: 32px; font-weight: 700; line-height: 1.25; margin: 6px 0 18px;
  background: linear-gradient(90deg, #fff, var(--cyan));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.article-main h2 {
  font-size: 22px; font-weight: 700; margin: 38px 0 14px; padding-left: var(--h2-inset);
  border-left: 3px solid var(--cyan); color: var(--text-0); scroll-margin-top: 84px;
}
.article-main h3 { font-size: 18px; font-weight: 600; margin: 26px 0 10px; color: var(--text-0);
  padding-left: var(--h2-inset); }
.article-main p { color: var(--text-1); margin: 12px 0; }
.article-main ul, .article-main ol { color: var(--text-1); padding-left: 28px; }
.article-main li { margin: 6px 0; }

/* 摘要块 callout */
.summary-block {
  border: 1px solid var(--border-strong); border-left: 4px solid var(--cyan);
  background: var(--cyan-soft); border-radius: var(--radius-sm);
  padding: 16px 18px; margin: 18px 0 14px; color: var(--text-0); font-size: 15.5px;
}
.keywords-line { color: var(--text-2); font-size: 14px; margin-bottom: 8px; }
.update-time { color: var(--text-2); font-size: 13px; margin: 6px 0 18px; }

/* 结论块 */
.conclusion {
  background: linear-gradient(120deg, rgba(21,101,255,0.10), rgba(0,224,198,0.08));
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 16px 18px; margin: 22px 0;
}
.conclusion strong { color: var(--cyan); }

/* 表格 */
table.data {
  width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 14.5px;
  border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden;
}
table.data th, table.data td { padding: 11px 14px; text-align: left; border-bottom: 1px solid var(--border); }
table.data thead th {
  background: rgba(21, 101, 255, 0.16); color: var(--text-0); font-weight: 600;
}
table.data tbody tr:nth-child(even) { background: rgba(255,255,255,0.02); }
table.data tbody tr:hover { background: rgba(0, 224, 198, 0.06); }

/* ---------- TOC 悬浮（sticky，禁 fixed）---------- */
.toc-aside { position: sticky; top: 84px; max-height: calc(100vh - 110px); overflow-y: auto; }
.toc-aside .toc-title { font-size: 13px; color: var(--text-2); text-transform: uppercase; letter-spacing: .08em; margin-bottom: 10px; }
.toc-aside ol { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--border); }
.toc-aside li a { display: block; padding: 6px 12px; color: var(--text-2); font-size: 13.5px; border-left: 2px solid transparent; margin-left: -1px; }
.toc-aside li a:hover { color: var(--cyan); border-left-color: var(--cyan); }
.toc-aside li.h3 a { padding-left: 26px; font-size: 13px; }

/* ---------- 列表 / 分类页 ---------- */
.cat-layout { display: grid; grid-template-columns: 220px minmax(0,1fr); gap: 32px; align-items: start; }
@media (max-width: 860px) { .cat-layout { grid-template-columns: 1fr; } }
.category-list { list-style: none; margin: 0; padding: 0; position: sticky; top: 84px; }
.category-list li { margin: 4px 0; }
.category-list a {
  display: block; padding: 10px 14px; border-radius: 10px; color: var(--text-1);
  border: 1px solid transparent;
}
.category-list a:hover, .category-list a.active {
  background: var(--cyan-soft); color: var(--text-0); border-color: var(--border-strong);
}
/* 分类折叠面板：默认收起，点击 summary 展开（原生 details，无 JS 依赖） */
.cat-panel { position: sticky; top: 84px; }
.cat-toggle {
  list-style: none; cursor: pointer; display: flex; align-items: center; justify-content: space-between;
  gap: 10px; padding: 11px 14px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--panel); color: var(--text-0); font-weight: 600; font-size: 15px; user-select: none;
  transition: border-color .2s, background .2s;
}
.cat-toggle:hover { border-color: var(--border-strong); background: var(--cyan-soft); }
.cat-toggle::-webkit-details-marker { display: none; }
.cat-toggle::after {
  content: ""; width: 8px; height: 8px; border-right: 2px solid var(--cyan); border-bottom: 2px solid var(--cyan);
  transform: rotate(45deg); transition: transform .2s; flex: none;
}
.cat-panel[open] .cat-toggle::after { transform: rotate(-135deg); }
.cat-panel > .category-list { margin-top: 10px; position: static; }
.list-item {
  display: block; padding: 18px 20px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--panel); margin-bottom: 14px; transition: transform .2s, border-color .2s; color: var(--text-0);
}
.list-item:hover { transform: translateY(-3px); border-color: var(--border-strong); }
.list-item h3 { margin: 0 0 6px; font-size: 18px; }
.list-item p { margin: 0; color: var(--text-2); font-size: 14px; }
.list-item .meta { margin-top: 8px; font-size: 12.5px; color: var(--text-2); }

/* ---------- FAQ（裸 details）---------- */
details.faq-item {
  border: 1px solid var(--border); border-radius: var(--radius-sm); margin: 10px 0;
  background: var(--panel); overflow: hidden;
}
details.faq-item summary {
  cursor: pointer; padding: 14px 18px; font-weight: 600; color: var(--text-0);
  list-style: none; display: flex; justify-content: space-between; align-items: center;
}
details.faq-item summary::-webkit-details-marker { display: none; }
details.faq-item summary::after { content: "＋"; color: var(--cyan); font-size: 18px; transition: transform .2s; }
details.faq-item[open] summary::after { content: "－"; }
details.faq-item .faq-a { padding: 0 18px 16px; color: var(--text-1); }
.faq-heading { font-size: 22px; font-weight: 700; margin: 36px 0 14px; padding-left: var(--h2-inset); border-left: 3px solid var(--cyan); }

/* ---------- 相关阅读 / 相关产品 ---------- */
.related-heading { font-size: 22px; font-weight: 700; margin: 40px 0 14px; padding-left: var(--h2-inset); border-left: 3px solid var(--cyan); }
.related-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
@media (max-width: 720px) { .related-list { grid-template-columns: 1fr; } }
.related-card { padding: 16px 18px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--panel); }
.related-card h4 { margin: 0 0 6px; font-size: 16px; }
.related-card p { margin: 0; font-size: 13.5px; color: var(--text-2); }

/* 实践经验 callout */
.case-study {
  border: 1px solid var(--border); border-left: 4px solid var(--warn);
  background: rgba(255,176,32,0.08); border-radius: var(--radius-sm);
  padding: 14px 18px; margin: 22px 0; color: var(--text-1);
}
.case-study b { color: var(--warn); }

/* ---------- 产品参数 ---------- */
.product-meta { display: flex; flex-wrap: wrap; gap: 10px; margin: 14px 0 22px; }
.tag-text {
  font-size: 12.5px; padding: 4px 11px; border-radius: 999px;
  background: var(--cyan-soft); color: var(--cyan); border: 1px solid var(--border-strong);
}

/* ---------- 悬浮工具胶囊 ---------- */
.float-capsule {
  position: fixed; right: 18px; top: 50%; transform: translateY(-50%);
  z-index: 80; display: flex; flex-direction: column; gap: 10px;
  background: linear-gradient(160deg, var(--primary), var(--primary-2) 45%, var(--cyan));
  padding: 12px 10px; border-radius: 999px; box-shadow: 0 14px 40px rgba(11, 140, 255, 0.45);
}
.float-capsule button {
  width: 46px; height: 46px; border-radius: 50%; border: none; cursor: pointer;
  background: rgba(255,255,255,0.14); color: #fff; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 2px; font-size: 10px; transition: transform .15s, background .15s;
}
.float-capsule button:hover { transform: scale(1.08); background: rgba(255,255,255,0.26); }
.float-capsule button .ico { font-size: 16px; line-height: 1; }
@media (max-width: 560px) { .float-capsule { right: 10px; padding: 8px 6px; } .float-capsule button { width: 40px; height: 40px; } }

/* 名片弹层 */
.modal-mask {
  position: fixed; inset: 0; background: rgba(3,7,14,0.78); backdrop-filter: blur(4px);
  display: none; align-items: center; justify-content: center; z-index: 200; padding: 20px;
}
.modal-mask.open { display: flex; }
.modal-mask img { width: 300px; height: 500px; object-fit: contain; border-radius: 12px; box-shadow: var(--shadow); }
.modal-close { position: absolute; top: 18px; right: 22px; color: #fff; font-size: 28px; cursor: pointer; background: none; border: none; }

/* ---------- 首页 ---------- */
.hero { padding: 80px 0 56px; text-align: center; position: relative; }
.hero .eyebrow { color: var(--cyan); letter-spacing: .14em; font-size: 13px; text-transform: uppercase; }
.hero h1 { font-size: 46px; line-height: 1.15; margin: 14px 0; font-weight: 800;
  background: linear-gradient(90deg, #fff 20%, var(--cyan)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.lead { color: var(--text-1); max-width: 720px; margin: 0 auto 26px; font-size: 17px; }
.hero .cta { display: inline-flex; gap: 12px; flex-wrap: wrap; justify-content: center; }
.btn {
  display: inline-block; padding: 12px 24px; border-radius: 999px; font-weight: 600; font-size: 15px;
  border: 1px solid var(--border-strong); color: var(--text-0); background: var(--cyan-soft); transition: transform .15s;
}
.btn:hover { transform: translateY(-2px); }
.btn.primary { background: linear-gradient(135deg, var(--primary), var(--cyan)); border: none; color: #04121f; }

.section { padding: 46px 0; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 22px; flex-wrap: wrap; gap: 10px; }
.section-head h2 { font-size: 26px; font-weight: 700; margin: 0; padding-left: var(--h2-inset); border-left: 3px solid var(--cyan); }
.section-head a { font-size: 14px; color: var(--text-2); }

.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 18px; }
.glass-card {
  border: 1px solid var(--border); border-radius: var(--radius); background: var(--panel);
  padding: 22px; transition: transform .2s, border-color .2s, box-shadow .2s; position: relative; overflow: hidden;
}
.glass-card:hover { transform: translateY(-4px); border-color: var(--border-strong); box-shadow: var(--glow); }
.glass-card h3 { margin: 0 0 8px; font-size: 18px; color: var(--text-0); }
.glass-card p { margin: 0; color: var(--text-2); font-size: 14px; }
.glass-card .kicker { color: var(--cyan); font-size: 12px; letter-spacing: .08em; text-transform: uppercase; }
.glass-card .num { position: absolute; right: 16px; top: 10px; font-size: 34px; font-weight: 800; color: rgba(0,224,198,0.12); }

/* 数据基线条 */
.baseline { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px,1fr)); gap: 14px; }
.baseline .cell { border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 16px; background: var(--panel); }
.baseline .cell b { display: block; font-size: 22px; color: var(--cyan); }
.baseline .cell span { color: var(--text-2); font-size: 13px; }

/* 应用场景条 */
.scenarios { display: flex; gap: 12px; flex-wrap: wrap; }
.scenario-chip { border: 1px solid var(--border); border-radius: 12px; padding: 14px 18px; background: var(--panel); color: var(--text-1); font-size: 14px; }

/* ---------- 页脚 ---------- */
.site-footer { border-top: 1px solid var(--border); background: rgba(7,12,22,0.6); padding: 38px 0 26px; margin-top: 40px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 26px; }
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.site-footer h4 { font-size: 14px; color: var(--text-0); margin: 0 0 12px; }
.site-footer a, .site-footer p { color: var(--text-2); font-size: 13.5px; display: block; margin: 6px 0; }
.footer-bottom { margin-top: 26px; padding-top: 18px; border-top: 1px solid var(--border); color: var(--text-2); font-size: 13px; text-align: center; }

/* ---------- 通用工具 ---------- */
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0; }
.muted { color: var(--text-2); }
.center-narrow { max-width: 760px; margin: 0 auto; }
.page-wrap h1 { font-size: 32px; font-weight: 700; margin: 8px 0 20px; padding-left: var(--h2-inset); border-left: 3px solid var(--cyan); }
.page-wrap h2 { font-size: 22px; font-weight: 700; margin: 34px 0 12px; padding-left: var(--h2-inset); border-left: 3px solid var(--cyan); }
.page-wrap h3 { font-size: 18px; font-weight: 600; margin: 22px 0 10px; padding-left: var(--h2-inset); }
.page-wrap p { color: var(--text-1); }