/* vna.射频校准件.中国 —— 原创深色精密测量主题（vna- 前缀，零复用） */
:root {
  --vna-bg: #0E1B2C;
  --vna-bg-soft: #122438;
  --vna-panel: #16293F;
  --vna-panel-2: #1B3048;
  --vna-line: #26405C;
  --vna-text: #E6EDF5;
  --vna-muted: #9FB3C8;
  --vna-cyan: #19C9A3;
  --vna-cyan-dim: #0F8E76;
  --vna-amber: #F5A623;
  --vna-amber-dim: #C9871A;
  --vna-h2-inset: 16px;
  --vna-radius: 12px;
  --vna-maxw: 1180px;
  --vna-font: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--vna-bg);
  color: var(--vna-text);
  font-family: var(--vna-font);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--vna-cyan); text-decoration: none; }
a:hover { color: var(--vna-amber); }
img { max-width: 100%; }

/* ===== 顶栏 ===== */
.vna-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(14, 27, 44, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--vna-line);
}
.vna-header-inner {
  max-width: var(--vna-maxw); margin: 0 auto;
  display: flex; align-items: center; gap: 22px;
  padding: 0 20px; height: 64px;
}
.vna-logo { font-weight: 700; font-size: 18px; color: var(--vna-text); white-space: nowrap; }
.vna-logo b { color: var(--vna-cyan); }
.vna-nav { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.vna-nav-item { position: relative; }
.vna-nav-item > a {
  display: inline-block; padding: 20px 14px; color: var(--vna-muted);
  font-size: 15px; transition: color .15s;
}
.vna-nav-item > a:hover, .vna-nav-item > a.is-active { color: var(--vna-text); }
.vna-nav-sub {
  position: absolute; top: 100%; left: 0; min-width: 184px;
  background: var(--vna-panel); border: 1px solid var(--vna-line);
  border-radius: 0 0 var(--vna-radius) var(--vna-radius);
  padding: 8px 0; display: none; box-shadow: 0 12px 30px rgba(0,0,0,.4);
}
.vna-nav-item:hover .vna-nav-sub, .vna-nav-item:focus-within .vna-nav-sub { display: block; }
.vna-nav-sub a { display: block; padding: 9px 16px; color: var(--vna-muted); font-size: 14px; }
.vna-nav-sub a:hover { background: var(--vna-panel-2); color: var(--vna-cyan); }
.vna-burger { display: none; background: none; border: 1px solid var(--vna-line);
  border-radius: 8px; color: var(--vna-text); width: 40px; height: 38px; cursor: pointer; font-size: 18px; }

/* ===== 布局容器 ===== */
.vna-container { max-width: var(--vna-maxw); margin: 0 auto; padding: 0 20px; }
.vna-page-wrap { max-width: var(--vna-maxw); margin: 0 auto; padding: 28px 20px 60px; }

/* ===== 面包屑 ===== */
.vna-breadcrumb { padding: 18px 0 6px; font-size: 13.5px; color: var(--vna-muted); }
.vna-breadcrumb ol { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.vna-breadcrumb li::after { content: "›"; margin-left: 6px; color: var(--vna-line); }
.vna-breadcrumb li:last-child::after { content: ""; }
.vna-breadcrumb a { color: var(--vna-muted); }
.vna-breadcrumb a:hover { color: var(--vna-cyan); }

/* ===== 详情页栅格 ===== */
.vna-layout { display: grid; grid-template-columns: minmax(0, 1fr) 240px; gap: 40px; align-items: start; }
.vna-content-main { min-width: 0; }
.vna-toc-aside { position: sticky; top: 84px; max-height: calc(100vh - 104px); overflow-y: auto; }

/* ===== 列表页栅格（侧栏在前）===== */
.vna-list-layout { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 40px; align-items: start; }
.vna-cat-side { position: sticky; top: 84px; }
.vna-cat-content { min-width: 0; }

/* ===== 内容排版 ===== */
.vna-content-main h1, .vna-page-main h1 {
  font-size: 30px; line-height: 1.3; margin: 6px 0 18px; color: #fff;
}
.vna-content-main h2, .vna-page-main h2 {
  font-size: 22px; margin: 34px 0 14px; padding-left: var(--vna-h2-inset);
  border-left: 4px solid var(--vna-cyan); color: #fff;
}
.vna-content-main h3, .vna-page-main h3 {
  font-size: 18px; margin: 24px 0 10px; padding-left: var(--vna-h2-inset); color: var(--vna-cyan);
}
.vna-content-main p, .vna-page-main p { margin: 0 0 16px; color: var(--vna-text); }
.vna-content-main ul, .vna-page-main ul { margin: 0 0 16px; padding-left: 28px; }
.vna-content-main li, .vna-page-main li { margin: 6px 0; }
.vna-summary-box {
  background: var(--vna-panel); border: 1px solid var(--vna-line);
  border-left: 4px solid var(--vna-amber); border-radius: var(--vna-radius);
  padding: 16px 18px; margin: 0 0 22px; color: var(--vna-text);
}
.vna-kw { color: var(--vna-amber); font-size: 14px; margin-bottom: 18px; }
.vna-kw b { color: var(--vna-muted); font-weight: 400; }
.vna-time { font-size: 13px; color: var(--vna-muted); margin: 4px 0 18px; }

/* ===== 表格（含 Markdown 裸 table 全覆盖）===== */
.vna-content-main table, .vna-page-main table, table.vna-spec {
  width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 14.5px;
  border: 1px solid #cbd5e1; background: var(--vna-panel);
}
.vna-content-main table th, .vna-page-main table th, table.vna-spec th {
  background: var(--vna-cyan-dim); color: #042; text-align: left;
  padding: 10px 12px; border: 1px solid #cbd5e1; font-weight: 600;
}
.vna-content-main table td, .vna-page-main table td, table.vna-spec td {
  padding: 9px 12px; border: 1px solid #cbd5e1; color: var(--vna-text);
}
.vna-content-main table tr:nth-child(even) td,
.vna-page-main table tr:nth-child(even) td,
table.vna-spec tr:nth-child(even) td { background: var(--vna-panel-2); }

/* ===== 结论块 ===== */
.vna-content-main blockquote, .vna-page-main blockquote {
  margin: 18px 0; padding: 14px 18px; background: var(--vna-bg-soft);
  border-left: 4px solid var(--vna-cyan); border-radius: 0 var(--vna-radius) var(--vna-radius) 0;
  color: var(--vna-text);
}
.vna-content-main blockquote strong { color: var(--vna-amber); }

/* ===== tag ===== */
.vna-tag { display: inline-block; background: var(--vna-panel-2); color: var(--vna-muted);
  border: 1px solid var(--vna-line); border-radius: 999px; padding: 2px 10px; font-size: 12.5px; margin: 2px 4px 2px 0; }

/* ===== FAQ / details ===== */
.vna-faq details, details.vna-detail {
  background: var(--vna-panel); border: 1px solid var(--vna-line);
  border-radius: var(--vna-radius); margin: 10px 0; overflow: hidden;
}
.vna-faq details summary, details.vna-detail summary {
  cursor: pointer; padding: 13px 16px; font-weight: 600; color: var(--vna-text);
  list-style: none; display: flex; justify-content: space-between; align-items: center;
}
.vna-faq details summary::-webkit-details-marker { display: none; }
.vna-faq details summary::after, details.vna-detail summary::after { content: "+"; color: var(--vna-cyan); font-size: 20px; }
.vna-faq details[open] summary::after, details.vna-detail[open] summary::after { content: "−"; }
.vna-faq details .vna-faq-a, .vna-faq details .vna-detail-body { padding: 0 16px 14px; color: var(--vna-muted); }

/* ===== 折叠面板 ===== */
details.vna-cat-panel, details.vna-toc-panel {
  background: var(--vna-panel); border: 1px solid var(--vna-line);
  border-radius: var(--vna-radius); margin-bottom: 16px; overflow: hidden;
}
details.vna-cat-panel > summary, details.vna-toc-panel > summary {
  cursor: pointer; padding: 13px 16px; font-weight: 600; color: var(--vna-text);
  list-style: none; display: flex; justify-content: space-between; align-items: center;
}
details.vna-cat-panel > summary::-webkit-details-marker,
details.vna-toc-panel > summary::-webkit-details-marker { display: none; }
details.vna-cat-panel > summary::after,
details.vna-toc-panel > summary::after { content: "▾"; color: var(--vna-cyan); }
details.vna-cat-panel[open] > summary::after,
details.vna-toc-panel[open] > summary::after { transform: rotate(180deg); }

.vna-category-list { list-style: none; margin: 0; padding: 6px 8px 12px; }
.vna-category-list li a {
  display: block; padding: 9px 12px; border-radius: 8px; color: var(--vna-muted); font-size: 14.5px;
}
.vna-category-list li a:hover, .vna-category-list li a.is-active { background: var(--vna-panel-2); color: var(--vna-cyan); }
.vna-toc-list { list-style: none; margin: 0; padding: 6px 8px 12px; counter-reset: toc; }
.vna-toc-list li { padding: 6px 12px; font-size: 14px; }
.vna-toc-list li a { color: var(--vna-muted); }
.vna-toc-list li a:hover { color: var(--vna-cyan); }

/* ===== 卡片 ===== */
.vna-card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 18px; margin: 18px 0; }
.vna-card {
  background: var(--vna-panel); border: 1px solid var(--vna-line); border-radius: var(--vna-radius);
  padding: 18px; transition: border-color .15s, transform .15s;
}
.vna-card:hover { border-color: var(--vna-cyan); transform: translateY(-2px); }
.vna-card h3 { margin: 0 0 8px; font-size: 17px; color: #fff; }
.vna-card p { margin: 0; color: var(--vna-muted); font-size: 14px; }
.vna-card .vna-cat-tag { color: var(--vna-amber); font-size: 12.5px; }

/* ===== 文章/产品列表项 ===== */
.vna-list-item { display: flex; gap: 14px; padding: 16px; border-bottom: 1px solid var(--vna-line); }
.vna-list-item:last-child { border-bottom: none; }
.vna-list-item h3 { margin: 0 0 6px; font-size: 17px; }
.vna-list-item h3 a { color: #fff; }
.vna-list-item p { margin: 0; color: var(--vna-muted); font-size: 14px; }
.vna-list-item .vna-meta { color: var(--vna-muted); font-size: 12.5px; margin-top: 6px; }

/* ===== 头部 hero（首页）===== */
.vna-hero {
  background: linear-gradient(135deg, var(--vna-bg-soft), var(--vna-panel));
  border: 1px solid var(--vna-line); border-radius: 18px; padding: 48px 40px; margin: 26px 0 30px;
}
.vna-hero h1 { font-size: 38px; margin: 0 0 14px; color: #fff; line-height: 1.25; }
.vna-hero h1 b { color: var(--vna-cyan); }
.vna-hero p { font-size: 17px; color: var(--vna-muted); max-width: 760px; }
.vna-hero .vna-cta { margin-top: 22px; display: flex; gap: 14px; flex-wrap: wrap; }
.vna-btn {
  display: inline-block; padding: 12px 22px; border-radius: 10px; font-weight: 600; font-size: 15px;
  background: var(--vna-cyan); color: #042; border: none; cursor: pointer;
}
.vna-btn:hover { background: var(--vna-amber); color: #211; }
.vna-btn-ghost { background: transparent; border: 1px solid var(--vna-line); color: var(--vna-text); }
.vna-btn-ghost:hover { border-color: var(--vna-cyan); color: var(--vna-cyan); }

/* ===== 统计 / 区块 ===== */
.vna-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin: 24px 0; }
.vna-stat { background: var(--vna-panel); border: 1px solid var(--vna-line); border-radius: var(--vna-radius); padding: 20px; text-align: center; }
.vna-stat b { display: block; font-size: 28px; color: var(--vna-cyan); }
.vna-stat span { color: var(--vna-muted); font-size: 14px; }
.vna-section-title { font-size: 24px; color: #fff; margin: 36px 0 14px; border-left: 4px solid var(--vna-amber); padding-left: var(--vna-h2-inset); }
.vna-pill-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 14px 0; }
.vna-pill { background: var(--vna-panel-2); border: 1px solid var(--vna-line); border-radius: 999px; padding: 8px 16px; color: var(--vna-text); font-size: 14px; }

/* ===== 悬浮胶囊 ===== */
.vna-float { position: fixed; right: 18px; top: 50%; transform: translateY(-50%); z-index: 60;
  display: flex; flex-direction: column; gap: 10px; }
.vna-float button {
  width: 52px; height: 52px; border-radius: 999px; border: none; cursor: pointer;
  background: linear-gradient(135deg, var(--vna-cyan), var(--vna-amber)); color: #042;
  font-size: 20px; box-shadow: 0 8px 22px rgba(0,0,0,.45); display: flex; align-items: center; justify-content: center;
}
.vna-float button.vna-float-mail { background: linear-gradient(135deg, var(--vna-amber), var(--vna-cyan-dim)); }
.vna-float button.vna-float-card { background: linear-gradient(135deg, var(--vna-cyan-dim), var(--vna-amber-dim)); }
.vna-float button span { font-size: 11px; font-weight: 700; }

/* ===== 名片弹层 ===== */
.vna-modal-mask { position: fixed; inset: 0; background: rgba(4,10,18,.78); z-index: 80; display: none;
  align-items: center; justify-content: center; }
.vna-modal-mask.is-open { display: flex; }
.vna-modal { background: var(--vna-panel); border: 1px solid var(--vna-line); border-radius: 14px; padding: 18px;
  text-align: center; max-width: 92vw; }
.vna-modal img { display: block; width: auto; height: auto; max-height: 80vh; border-radius: 8px; }
.vna-modal .vna-modal-close { margin-top: 14px; background: var(--vna-panel-2); color: var(--vna-text);
  border: 1px solid var(--vna-line); border-radius: 8px; padding: 8px 18px; cursor: pointer; }

/* ===== 页脚 ===== */
.vna-footer { border-top: 1px solid var(--vna-line); background: var(--vna-bg-soft); margin-top: 50px; }
.vna-footer-inner { max-width: var(--vna-maxw); margin: 0 auto; padding: 34px 20px; display: grid;
  grid-template-columns: 1.4fr 1fr 1fr; gap: 28px; }
.vna-footer h4 { color: #fff; font-size: 15px; margin: 0 0 12px; }
.vna-footer a, .vna-footer p { color: var(--vna-muted); font-size: 14px; display: block; margin: 6px 0; }
.vna-footer a:hover { color: var(--vna-cyan); }
.vna-footer .vna-copy { grid-column: 1 / -1; border-top: 1px solid var(--vna-line); padding-top: 16px;
  color: var(--vna-muted); font-size: 13px; }

/* ===== 404 / 归档 ===== */
.vna-archive-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.vna-err { text-align: center; padding: 80px 20px; }
.vna-err h1 { font-size: 64px; color: var(--vna-cyan); margin: 0; }

/* ===== 响应式（断点 1024，与 JS matchMedia 一致）===== */
@media (max-width: 1024px) {
  .vna-nav { display: none; }
  .vna-nav.is-open { display: flex; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0;
    background: var(--vna-panel); border-bottom: 1px solid var(--vna-line); padding: 8px 0; }
  .vna-nav.is-open .vna-nav-item { width: 100%; }
  .vna-nav.is-open .vna-nav-item > a { padding: 12px 20px; }
  .vna-nav.is-open .vna-nav-sub { position: static; display: none; box-shadow: none; border: none; }
  .vna-nav.is-open .vna-nav-item:focus-within .vna-nav-sub { display: block; }
  .vna-burger { display: block; margin-left: auto; }
  .vna-layout { grid-template-columns: 1fr; }
  .vna-list-layout { grid-template-columns: 1fr; }
  .vna-toc-aside, .vna-cat-side { position: static; max-height: none; }
  .vna-stats { grid-template-columns: repeat(2, 1fr); }
  .vna-footer-inner { grid-template-columns: 1fr 1fr; }
  .vna-hero { padding: 32px 22px; }
  .vna-hero h1 { font-size: 28px; }
}
@media (max-width: 600px) {
  .vna-footer-inner { grid-template-columns: 1fr; }
  .vna-stats { grid-template-columns: 1fr; }
  .vna-float { right: 10px; }
}