:root {
  --bg: #0a0f1e;
  --bg-soft: #111a30;
  --panel: #15203a;
  --line: #243049;
  --text: #e8eef9;
  --muted: #9fb0cc;
  --brand: #25d0e6;
  --brand-2: #4f7cff;
  --accent: #7af0c8;
  --header-h: 64px;
  --h2-inset: 0px;
  --maxw: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, "Segoe UI", sans-serif;
  background: radial-gradient(1200px 600px at 70% -10%, #16284d 0%, var(--bg) 55%) fixed;
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  /* 关闭浏览器对中西文混排的自动加宽间隙，避免英文术语两侧出现异常空隙 */
  text-autospace: no-autospace;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ===== 顶部固定导航 ===== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  background: rgba(10, 15, 30, 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
/* 预留 header 高度，避免正文被固定头部遮挡 */
body { padding-top: var(--header-h); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: var(--header-h); }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 700; }
.brand:hover { text-decoration: none; }
.brand-mark { width: 22px; height: 22px; border-radius: 6px; background: linear-gradient(135deg, var(--brand), var(--brand-2)); box-shadow: 0 0 14px rgba(37, 208, 230, 0.5); }
.brand-name { font-size: 17px; letter-spacing: 0.5px; }
.primary-nav { display: flex; gap: 22px; }
.primary-nav a { color: var(--muted); font-size: 15px; }
.primary-nav a:hover { color: var(--text); text-decoration: none; }
.nav-toggle { display: none; background: var(--panel); color: var(--text); border: 1px solid var(--line); border-radius: 8px; padding: 8px 14px; cursor: pointer; }
.mobile-nav { border-top: 1px solid var(--line); padding: 12px 20px; display: flex; flex-direction: column; gap: 6px; background: var(--bg-soft); }
/* hidden 属性必须生效：display 优先级高于 UA 的 [hidden] 样式，需显式覆盖，否则菜单默认展开遮挡正文 */
.mobile-nav[hidden] { display: none !important; }
.mobile-nav a { color: var(--text); padding: 6px 0; }
.mobile-nav .m-cat summary { cursor: pointer; padding: 6px 0; color: var(--muted); }
.mobile-nav .m-cat ul { list-style: none; margin: 4px 0 8px; padding-left: 14px; }
.mobile-nav .m-cat li { padding: 3px 0; }

/* ===== 布局栅格 ===== */
.layout-grid { display: grid; grid-template-columns: minmax(0, 1fr) 240px; gap: 32px; align-items: start; }
.list-layout .layout-grid { grid-template-columns: 240px minmax(0, 1fr); }
.content-main { min-width: 0; max-width: 820px; }
.page-main { max-width: 860px; margin: 0 auto; }
.home-layout { padding-top: 8px; }

/* ===== 面包屑（左缘与 H2 对齐） ===== */
.breadcrumb { margin: 18px 0 14px; padding-left: var(--h2-inset); }
.breadcrumb ol { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; font-size: 13px; color: var(--muted); }
.breadcrumb li::after { content: "›"; margin-left: 8px; color: var(--line); }
.breadcrumb li:last-child::after { content: ""; }
.breadcrumb a { color: var(--muted); }
.breadcrumb .current span { color: var(--text); }

/* ===== 正文排版 ===== */
.content-main h1, .page-main h1 { font-size: 30px; line-height: 1.3; margin: 6px 0 14px; }
.content-main h2, .page-main h2 { font-size: 22px; margin: 34px 0 12px; padding-left: 12px; border-left: 4px solid var(--brand); }
.content-main h3, .page-main h3 { font-size: 18px; margin: 24px 0 10px; color: var(--accent); }
.lead { background: var(--panel); border: 1px solid var(--line); border-left: 4px solid var(--brand-2); border-radius: 10px; padding: 16px 18px; margin: 16px 0; color: #d7e3f7; }
.kw-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0 20px; }
.tag-text { background: rgba(79, 124, 255, 0.16); color: #bcd0ff; border: 1px solid rgba(79, 124, 255, 0.4); border-radius: 999px; padding: 3px 12px; font-size: 13px; }
.update-time { display: inline-block; color: var(--muted); font-size: 13px; margin: 4px 0 18px; }
.content-main p, .page-main p { margin: 12px 0; }
.content-main ul, .page-main ul { padding-left: 22px; }
.content-main li, .page-main li { margin: 6px 0; }

/* ===== 表格（覆盖全部正文 table，含 Markdown 裸 table） ===== */
.content-main table, .page-main table, table.data {
  width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 14.5px;
  border: 1px solid #cbd5e1;
}
.content-main table th, .page-main table th, table.data th {
  background: var(--brand-2); color: #fff; text-align: left; padding: 9px 12px; border: 1px solid #cbd5e1; font-weight: 600;
}
.content-main table td, .page-main table td, table.data td {
  padding: 8px 12px; border: 1px solid #cbd5e1; color: #e3ebf8;
}
.content-main table tbody tr:nth-child(even), .page-main table tbody tr:nth-child(even), table.data tbody tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.04);
}

/* ===== 结论 / 实践经验 callout ===== */
.conclusion { background: rgba(122, 240, 200, 0.08); border: 1px solid rgba(122, 240, 200, 0.4); border-radius: 10px; padding: 14px 18px; margin: 18px 0; }
.conclusion strong, .conclusion b { color: var(--accent); }
.callout-case { background: rgba(255, 196, 0, 0.08); border: 1px solid rgba(255, 196, 0, 0.4); border-left: 4px solid #ffc400; border-radius: 10px; padding: 12px 16px; margin: 18px 0; }

/* ===== FAQ（裸 details） ===== */
.content-main details.faq-item, .page-main details.faq-item,
details.faq-item { border: 1px solid var(--line); border-radius: 10px; margin: 10px 0; background: var(--panel); }
details.faq-item summary { cursor: pointer; padding: 12px 16px; font-weight: 600; color: var(--text); }
details.faq-item summary::-webkit-details-marker { color: var(--brand); }
details.faq-item .faq-a { padding: 0 16px 14px; color: #d7e3f7; }
.faq-block { margin: 22px 0; }
.faq-block > h2 { font-size: 20px; }

/* ===== 相关阅读 / 相关产品 ===== */
.related-list { list-style: none; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 14px 0; }
.related-list li { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; }
.related-list a { font-weight: 600; }
.related-list span { display: block; color: var(--muted); font-size: 13px; margin-top: 4px; }

/* ===== 目录 TOC（sticky，非 fixed） ===== */
.toc-aside { position: sticky; top: calc(var(--header-h) + 16px); max-height: calc(100vh - 100px); overflow-y: auto; }
.toc-panel { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 6px 4px; }
.toc-panel summary { cursor: pointer; padding: 10px 14px; font-weight: 700; color: var(--text); }
.toc-panel ul { list-style: none; margin: 4px 0; padding: 0 14px; }
.toc-panel li { margin: 4px 0; }
.toc-panel li a { color: var(--muted); font-size: 14px; }
.toc-panel li.lvl-3 a { padding-left: 12px; font-size: 13px; }
.toc-panel li a:hover { color: var(--brand); }

/* ===== 分类侧栏（原生 details，左 240px） ===== */
.cat-panel { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 6px 4px; margin-bottom: 16px; }
.cat-panel summary { cursor: pointer; padding: 10px 14px; font-weight: 700; color: var(--text); }
.category-list { list-style: none; margin: 4px 0; padding: 0 14px; }
.category-list li { margin: 2px 0; }
.category-list li a { display: block; padding: 7px 10px; border-radius: 8px; color: var(--muted); }
.category-list li a:hover { background: rgba(37, 208, 230, 0.12); color: var(--text); text-decoration: none; }
.category-list li.active a { background: rgba(37, 208, 230, 0.18); color: var(--text); font-weight: 600; }

/* ===== 列表页卡片（仅列表内容区，非分类卡片网格，遵守 [M1']） ===== */
.post-list { list-style: none; padding: 0; margin: 16px 0; }
.post-list li { border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; margin-bottom: 14px; background: var(--panel); }
.post-list h3 { margin: 0 0 6px; font-size: 18px; }
.post-list h3 a { color: var(--text); }
.post-list .excerpt { color: var(--muted); font-size: 14px; margin: 6px 0; }
.post-list .meta { color: var(--muted); font-size: 12px; }
.cat-intro { color: var(--muted); margin: 8px 0 6px; }

/* ===== 页脚 ===== */
.site-footer { border-top: 1px solid var(--line); margin-top: 48px; background: var(--bg-soft); }
.footer-inner { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 24px; padding: 32px 20px 12px; max-width: var(--maxw); margin: 0 auto; }
.footer-title { color: var(--text); font-weight: 700; margin: 0 0 10px; }
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin: 6px 0; }
.footer-desc { color: var(--muted); font-size: 14px; }
.footer-note { text-align: center; color: var(--muted); font-size: 12.5px; padding: 14px 20px 26px; margin: 0; border-top: 1px solid var(--line); }

/* ===== 悬浮工具胶囊（右侧居中） ===== */
.float-capsule { position: fixed; right: 18px; top: 50%; transform: translateY(-50%); display: flex; flex-direction: column; gap: 10px; z-index: 60; }
.cap-btn { display: flex; flex-direction: column; align-items: center; gap: 2px; width: 60px; padding: 10px 0; border: none; border-radius: 16px; cursor: pointer; color: #06121f; font-weight: 700; font-size: 12px; background: linear-gradient(135deg, var(--brand), var(--brand-2)); box-shadow: 0 6px 22px rgba(37, 208, 230, 0.4); }
.cap-btn:hover { text-decoration: none; filter: brightness(1.08); }
.cap-ico { font-size: 18px; line-height: 1; }

/* ===== 名片弹窗（原尺寸，不压缩） ===== */
.card-modal { position: fixed; inset: 0; z-index: 80; display: flex; align-items: center; justify-content: center; }
.card-modal[hidden] { display: none; }
.card-modal-mask { position: absolute; inset: 0; background: rgba(2, 6, 14, 0.72); }
.card-modal-box { position: relative; background: #fff; border-radius: 10px; padding: 6px; }
.card-modal-img { display: block; width: auto; height: auto; max-width: 92vw; max-height: 92vh; }
.card-modal-close { position: absolute; top: -14px; right: -14px; width: 32px; height: 32px; border-radius: 50%; border: none; background: #06121f; color: #fff; font-size: 20px; cursor: pointer; }

/* ===== 首页模块 ===== */
.hero { padding: 54px 0 30px; }
.hero h1 { font-size: 38px; line-height: 1.25; margin: 0 0 14px; background: linear-gradient(120deg, #fff, var(--brand)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p { color: var(--muted); font-size: 17px; max-width: 760px; }
.hero .kw-row { margin-top: 18px; }
.section { margin: 38px 0; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 16px; }
.section-head h2 { font-size: 24px; margin: 0; padding-left: 12px; border-left: 4px solid var(--brand); }
.section-head a { font-size: 14px; color: var(--brand); }
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.info-card { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 18px; transition: transform .15s, border-color .15s; }
.info-card:hover { transform: translateY(-3px); border-color: var(--brand); }
.info-card h3 { margin: 0 0 8px; font-size: 17px; }
.info-card h3 a { color: var(--text); }
.info-card p { color: var(--muted); font-size: 14px; margin: 0; }
.baseline { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 18px 20px; }
.baseline ul { columns: 2; column-gap: 28px; }
.baseline li { break-inside: avoid; margin: 6px 0; color: #d7e3f7; font-size: 14.5px; }

/* ===== 响应式：≤1024 折叠为单列 ===== */
@media (max-width: 1024px) {
  .layout-grid, .list-layout .layout-grid { grid-template-columns: 1fr; }
  .toc-aside { position: static; max-height: none; margin-top: 18px; }
  .primary-nav { display: none; }
  .nav-toggle { display: block; }
  .baseline ul { columns: 1; }
  .related-list { grid-template-columns: 1fr; }
}
@media (min-width: 1025px) {
  .mobile-nav { display: none !important; }
}