/* ============================================================
   K型电缆组件 · 深空蓝 + 电光青 科技主题（独立实现，非集群复用）
   ============================================================ */
:root {
  --bg: #071425;
  --bg-2: #0b1f3a;
  --panel: #0e2748;
  --panel-2: #12315a;
  --line: #1c3f6b;
  --line-soft: #16314f;
  --ink: #e8f1fb;
  --ink-soft: #a9c2e0;
  --muted: #7e9bc0;
  --cyan: #19d3e6;
  --cyan-2: #36e0ff;
  --blue: #2f7bff;
  --warn: #ffcf5c;
  --radius: 14px;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
  --h2-inset: 0px;            /* 详情页面包屑与 H2 同容器，左缘自然对齐 */
  --maxw: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(25, 211, 230, 0.12), transparent 60%),
    radial-gradient(900px 500px at -10% 10%, rgba(47, 123, 255, 0.12), transparent 55%),
    var(--bg);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--cyan); text-decoration: none; }
a:hover { color: var(--cyan-2); }
img { max-width: 100%; }

/* ---------------- 顶部导航 ---------------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(7, 20, 37, 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 12px 20px;
  display: flex; align-items: center; gap: 18px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--ink); }
.brand .logo-dot {
  width: 30px; height: 30px; border-radius: 8px;
  background: linear-gradient(135deg, var(--cyan), var(--blue));
  display: grid; place-items: center; color: #04121f; font-weight: 800; font-size: 15px;
  box-shadow: 0 0 18px rgba(25, 211, 230, 0.5);
}
.brand small { color: var(--muted); font-weight: 500; display: block; font-size: 12px; }
.nav-menu { list-style: none; display: flex; gap: 4px; margin: 0 0 0 auto; padding: 0; }
.nav-menu > li { position: relative; }
.nav-link {
  display: inline-block; padding: 9px 14px; color: var(--ink-soft); border-radius: 8px;
  font-size: 15px;
}
.nav-link:hover { color: var(--ink); background: var(--panel); }
.nav-drop {
  position: absolute; top: 100%; left: 0; min-width: 220px;
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  box-shadow: var(--shadow); padding: 8px; display: none; z-index: 60;
}
.nav-menu > li:hover > .nav-drop { display: block; }
.nav-drop a { display: flex; justify-content: space-between; gap: 10px; padding: 8px 10px; border-radius: 8px; color: var(--ink-soft); }
.nav-drop a:hover { background: var(--panel-2); color: var(--ink); }
.nav-drop a .cnt { color: var(--cyan); font-size: 12px; }
.nav-toggle { display: none; margin-left: auto; background: var(--panel); border: 1px solid var(--line);
  color: var(--ink); width: 42px; height: 38px; border-radius: 9px; font-size: 18px; cursor: pointer; }
.mobile-panel { display: none; }

/* ---------------- 容器 ---------------- */
.container { max-width: var(--maxw); margin: 0 auto; padding: 26px 20px 60px; }
.page-main { min-height: 60vh; }

/* ---------------- 首页 ---------------- */
.hero {
  position: relative; border: 1px solid var(--line); border-radius: 20px;
  background: linear-gradient(135deg, rgba(25,211,230,0.10), rgba(47,123,255,0.08)), var(--panel);
  padding: 46px 34px; overflow: hidden;
}
.hero h1 { font-size: clamp(26px, 4vw, 42px); margin: 0 0 12px; line-height: 1.25; }
.hero p { color: var(--ink-soft); max-width: 720px; margin: 0 0 22px; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 11px 18px; border-radius: 10px;
  font-weight: 600; border: 1px solid transparent; cursor: pointer;
}
.btn-primary { background: linear-gradient(135deg, var(--cyan), var(--blue)); color: #04121f; }
.btn-ghost { border-color: var(--line); color: var(--ink); background: var(--panel); }

.band {
  display: flex; flex-wrap: wrap; gap: 10px; margin: 22px 0 6px;
}
.band .chip {
  border: 1px solid var(--line); background: var(--panel); color: var(--ink-soft);
  padding: 7px 13px; border-radius: 999px; font-size: 13px;
}
.band .chip b { color: var(--cyan); }

.section { margin-top: 46px; }
.section > h2 { font-size: 22px; margin: 0 0 6px; }
.section > .sub { color: var(--muted); margin: 0 0 20px; }

.matrix { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.matrix .cell {
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel);
  padding: 18px; transition: border-color .2s, transform .2s;
}
.matrix .cell:hover { border-color: var(--cyan); transform: translateY(-3px); }
.matrix .cell h3 { margin: 0 0 8px; font-size: 17px; color: var(--cyan); }
.matrix .cell p { margin: 0; color: var(--ink-soft); font-size: 14px; }

.cat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.cat-card {
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel);
  padding: 18px 18px 16px; display: block; color: var(--ink);
}
.cat-card:hover { border-color: var(--cyan); }
.cat-card h3 { margin: 0 0 6px; font-size: 17px; }
.cat-card p { margin: 0 0 10px; color: var(--muted); font-size: 13.5px; min-height: 40px; }
.cat-card .cnt { color: var(--cyan); font-size: 13px; }

.post-list { display: grid; gap: 14px; }
.post-item {
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel);
  padding: 16px 18px; transition: border-color .2s;
}
.post-item:hover { border-color: var(--cyan); }
.post-item h2 { margin: 6px 0 6px; font-size: 18px; }
.post-item h2 a { color: var(--ink); }
.post-item p { margin: 0; color: var(--ink-soft); font-size: 14px; }
.pi-meta { margin-top: 10px; display: flex; gap: 8px; align-items: center; flex-wrap: wrap; color: var(--muted); font-size: 12.5px; }
.pi-kicker { color: var(--cyan); border: 1px solid var(--line); padding: 2px 8px; border-radius: 999px; font-size: 12px; }
.chip { background: var(--panel-2); border: 1px solid var(--line); color: var(--ink-soft); padding: 2px 9px; border-radius: 999px; font-size: 12px; }

/* ---------------- 列表页 ---------------- */
.list-shell { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 28px; align-items: start; }
.cat-fold, .toc-fold {
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel);
  padding: 8px; position: sticky; top: 80px;
}
.cat-fold > summary, .toc-fold > summary {
  cursor: pointer; padding: 10px 12px; font-weight: 700; list-style: none;
  display: flex; align-items: center; justify-content: space-between; color: var(--ink);
}
.cat-fold > summary::after, .toc-fold > summary::after { content: "▾"; color: var(--cyan); transition: transform .2s; }
.cat-fold[open] > summary::after, .toc-fold[open] > summary::after { transform: rotate(180deg); }
.cat-list { list-style: none; margin: 6px 0 4px; padding: 0; }
.cat-list li a {
  display: flex; justify-content: space-between; gap: 8px; padding: 8px 10px; border-radius: 8px;
  color: var(--ink-soft); font-size: 14px;
}
.cat-list li a:hover, .cat-list li a.active { background: var(--panel-2); color: var(--ink); }
.cat-list li a .cnt { color: var(--cyan); font-size: 12px; }
.list-core .page-title-row h1 { font-size: 26px; margin: 0 0 6px; }
.list-core .desc { color: var(--muted); margin: 0 0 18px; }

/* ---------------- 详情页 ---------------- */
.doc-shell { display: grid; grid-template-columns: minmax(0, 1fr) 260px; gap: 30px; align-items: start; }
.doc-core { min-width: 0; }
.breadcrumb { font-size: 13px; color: var(--muted); margin: 0 0 16px; padding-left: var(--h2-inset); }
.breadcrumb a { color: var(--ink-soft); }
.breadcrumb a:hover { color: var(--cyan); }
.breadcrumb .sep { margin: 0 7px; color: var(--line); }
.breadcrumb .cur { color: var(--ink); }

.doc-core h1 { font-size: clamp(24px, 3.4vw, 34px); margin: 0 0 14px; line-height: 1.28; }
.doc-abstract {
  border-left: 3px solid var(--cyan); background: linear-gradient(90deg, rgba(25,211,230,0.08), transparent);
  padding: 12px 16px; border-radius: 0 10px 10px 0; color: var(--ink-soft); margin: 0 0 14px;
}
.doc-abstract p { margin: 0; }
.doc-tags { display: flex; gap: 8px; flex-wrap: wrap; margin: 0 0 8px; }
.tag-text { background: var(--panel-2); border: 1px solid var(--line); color: var(--ink-soft);
  padding: 3px 10px; border-radius: 999px; font-size: 12.5px; }
.doc-time { color: var(--muted); font-size: 13px; margin: 0 0 18px; }

.doc-body { font-size: 16px; }
.doc-body h2 {
  font-size: 21px; margin: 30px 0 12px; padding-left: var(--h2-inset);
  scroll-margin-top: 80px; color: var(--ink);
  border-bottom: 1px solid var(--line-soft); padding-bottom: 8px;
}
.doc-body h3 { font-size: 17px; margin: 22px 0 10px; color: var(--cyan-2); }
.doc-body p { margin: 0 0 14px; color: var(--ink-soft); }
.doc-body ul, .doc-body ol { margin: 0 0 14px; padding-left: 22px; color: var(--ink-soft); }
.doc-body li { margin: 4px 0; }
.doc-body blockquote {
  border-left: 3px solid var(--blue); background: var(--panel); margin: 0 0 16px;
  padding: 12px 16px; border-radius: 0 10px 10px 0; color: var(--ink);
}
.doc-body code { background: var(--panel-2); padding: 2px 6px; border-radius: 6px; font-size: 14px; color: var(--cyan-2); }

/* 表格边框覆盖全部正文表格（含 Markdown 裸 table） */
.doc-body table, .page-body table, table.spec {
  width: 100%; border-collapse: collapse; margin: 0 0 18px; font-size: 14.5px;
  border: 1px solid #cbd5e1;
}
.doc-body th, .doc-body td, .page-body th, .page-body td, table.spec th, table.spec td {
  border: 1px solid #cbd5e1; padding: 9px 12px; text-align: left;
}
.doc-body thead th, .page-body thead th, table.spec thead th {
  background: var(--blue); color: #fff; font-weight: 600;
}
.doc-body tbody tr:nth-child(even), .page-body tbody tr:nth-child(even), table.spec tbody tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.03);
}

.field-note {
  border: 1px solid var(--line); border-left: 3px solid var(--warn);
  background: var(--panel); border-radius: 10px; padding: 12px 16px; margin: 18px 0;
}
.field-note .fn-tag { color: var(--warn); font-weight: 700; margin-right: 8px; }

.qa-block { margin: 22px 0; }
.qa-block h2 { font-size: 21px; margin: 0 0 12px; }
.qa-item { border: 1px solid var(--line); border-radius: 12px; margin-bottom: 10px; background: var(--panel); overflow: hidden; }
.qa-item > summary {
  cursor: pointer; padding: 13px 16px; font-weight: 600; list-style: none;
  display: flex; gap: 10px; align-items: center; color: var(--ink);
}
.qa-item > summary::before { content: "?"; color: var(--cyan); font-weight: 800; }
.qa-item[open] > summary { border-bottom: 1px solid var(--line); }
.qa-item .faq-a { margin: 0; padding: 12px 16px 14px; color: var(--ink-soft); }

.rel-block { margin: 22px 0; }
.rel-block h2 { font-size: 21px; margin: 0 0 12px; }
.rel-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.rel-list li a {
  display: block; border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px;
  color: var(--ink); background: var(--panel);
}
.rel-list li a:hover { border-color: var(--cyan); }
.rel-list li a small { display: block; color: var(--muted); font-size: 13px; margin-top: 4px; }

/* TOC */
.toc-fold { top: 80px; max-height: calc(100vh - 100px); overflow: auto; }
.toc-body { padding: 4px 12px 12px; }
.toc-body a { display: block; padding: 5px 0; color: var(--ink-soft); font-size: 13.5px; border-left: 2px solid transparent; padding-left: 10px; }
.toc-body a:hover, .toc-body a.current { color: var(--cyan); border-left-color: var(--cyan); }

/* ---------------- 页面（about/services…） ---------------- */
.page-body { max-width: 820px; }
.page-body h2 { font-size: 22px; margin: 28px 0 12px; border-bottom: 1px solid var(--line-soft); padding-bottom: 8px; }
.page-body h3 { font-size: 17px; margin: 20px 0 10px; color: var(--cyan-2); }

/* ---------------- 分页 ---------------- */
.pager { display: flex; gap: 8px; margin-top: 24px; flex-wrap: wrap; }
.pager a, .pager span {
  border: 1px solid var(--line); border-radius: 8px; padding: 7px 12px; color: var(--ink-soft); font-size: 14px;
}
.pager a:hover { border-color: var(--cyan); color: var(--cyan); }
.pager .cur { background: var(--panel-2); color: var(--cyan); border-color: var(--cyan); }

/* ---------------- 页脚 ---------------- */
.site-footer { border-top: 1px solid var(--line); background: rgba(7,20,37,0.7); margin-top: 40px; }
.footer-inner { max-width: var(--maxw); margin: 0 auto; padding: 28px 20px; display: grid;
  grid-template-columns: 2fr 1fr 1fr; gap: 24px; color: var(--muted); font-size: 14px; }
.footer-inner h4 { color: var(--ink); margin: 0 0 10px; font-size: 15px; }
.footer-inner a { color: var(--ink-soft); display: block; margin: 5px 0; }
.footer-inner a:hover { color: var(--cyan); }
.footer-bottom { border-top: 1px solid var(--line); padding: 14px 20px; text-align: center; color: var(--muted); font-size: 13px; }
.footer-bottom [data-mail-slot] { color: var(--cyan); }

/* ---------------- 悬浮工具胶囊 ---------------- */
.rail-tools {
  position: fixed; right: 18px; top: 50%; transform: translateY(-50%); z-index: 70;
  display: flex; flex-direction: column; gap: 10px;
}
.rail-item {
  display: flex; align-items: center; gap: 8px; padding: 11px 15px; border-radius: 999px;
  border: none; cursor: pointer; color: #04121f; font-weight: 700; font-size: 14px;
  background: linear-gradient(135deg, var(--cyan), var(--blue));
  box-shadow: 0 6px 18px rgba(25, 211, 230, 0.35); transition: transform .15s, filter .15s;
}
.rail-item:hover { transform: translateX(-3px); filter: brightness(1.08); }
.rail-item.mail { background: linear-gradient(135deg, #36e0ff, #2f7bff); }
.rail-item.top { background: linear-gradient(135deg, #7ee8f7, #19d3e6); }
.rail-item svg { width: 18px; height: 18px; }

/* ---------------- 名片弹窗 ---------------- */
.wx-modal {
  position: fixed; inset: 0; z-index: 90; display: none; place-items: center;
  background: rgba(3, 10, 20, 0.78);
}
.wx-modal.open { display: grid; }
.wx-stage { position: relative; background: #fff; border-radius: 12px; padding: 8px; box-shadow: var(--shadow); }
.wx-stage img { display: block; width: 300px; height: 500px; object-fit: contain; border-radius: 8px; }
.wx-close {
  position: absolute; top: -14px; right: -14px; width: 34px; height: 34px; border-radius: 50%;
  border: none; background: var(--panel); color: var(--ink); font-size: 16px; cursor: pointer; box-shadow: var(--shadow);
}
.wx-hint { position: absolute; bottom: -30px; left: 0; right: 0; text-align: center; color: #cfe3ff; font-size: 13px; }

/* ---------------- 404 / archive ---------------- */
.archive-groups { display: grid; gap: 22px; }
.archive-group h2 { font-size: 19px; margin: 0 0 10px; color: var(--cyan); }
.archive-group ul { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 8px; }
.archive-group a { display: block; padding: 9px 12px; border: 1px solid var(--line); border-radius: 9px; color: var(--ink-soft); background: var(--panel); }
.archive-group a:hover { border-color: var(--cyan); color: var(--ink); }
.empty { color: var(--muted); padding: 40px 0; text-align: center; }

/* ---------------- 响应式 ---------------- */
@media (max-width: 1024px) {
  .nav-menu { display: none; }
  .nav-toggle { display: block; }
  .mobile-panel {
    display: none; border-bottom: 1px solid var(--line); background: var(--bg-2);
    padding: 10px 20px;
  }
  .mobile-panel.open { display: block; }
  .mobile-panel a { display: block; padding: 9px 0; color: var(--ink-soft); border-bottom: 1px solid var(--line-soft); }
  .doc-shell { grid-template-columns: 1fr; }
  /* 折叠面板在手机端保留可点击入口（不 display:none），由 JS 默认收起 */
  .toc-fold { position: static; max-height: none; margin-bottom: 18px; }
  .list-shell { grid-template-columns: 1fr; }
  .cat-fold { position: static; margin-bottom: 18px; }
  .footer-inner { grid-template-columns: 1fr; }
  .rail-tools { right: 10px; }
}
@media (min-width: 1025px) {
  .mobile-panel { display: none !important; }
}