:root {
  --knowledge-ink: #111827;
  --knowledge-copy: #4b5563;
  --knowledge-muted: #8a94a3;
  --knowledge-navy: #1e3a5f;
  --knowledge-navy-soft: #f2f5f8;
  --knowledge-gold: #b8860b;
  --knowledge-green: #19714c;
  --knowledge-line: #e1e6eb;
  --knowledge-line-strong: #cdd5de;
  --knowledge-white: #ffffff;
  --knowledge-radius: 8px;
  --knowledge-font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scrollbar-gutter: stable; }
body.knowledge-page { margin: 0; background: #fff; color: var(--knowledge-ink); font-family: var(--knowledge-font); line-height: 1.75; }
.knowledge-page a { color: inherit; text-decoration: none; }
.knowledge-page img { display: block; max-width: 100%; }
.knowledge-page button, .knowledge-page input { font: inherit; }
.knowledge-page h1, .knowledge-page h2, .knowledge-page h3, .knowledge-page p { margin: 0; letter-spacing: 0; }
.knowledge-shell { width: 100%; max-width: var(--site-nav-width, 1400px); margin: 0 auto; padding: 0 var(--site-nav-pad, 32px); }

.knowledge-breadcrumbs { background: #fff; }
.knowledge-breadcrumbs ol { min-height: 42px; display: flex; align-items: center; gap: 8px; margin: 0; padding: 0; color: var(--knowledge-muted); font-size: 13px; list-style: none; }
.knowledge-breadcrumbs li { display: inline-flex; align-items: center; gap: 8px; }
.knowledge-breadcrumbs li + li::before { color: #b2bac4; content: "/"; }
.knowledge-breadcrumbs a:hover { color: var(--knowledge-navy); }
.knowledge-breadcrumbs [aria-current="page"] { max-width: 560px; overflow: hidden; color: var(--knowledge-copy); text-overflow: ellipsis; white-space: nowrap; }

.knowledge-index-head { padding: 12px 0 0; background: #fff; }
.knowledge-index-head-grid {
  max-width: calc(var(--site-nav-width, 1400px) - var(--site-nav-pad, 32px) - var(--site-nav-pad, 32px));
  padding: 36px var(--site-nav-pad, 32px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  gap: 72px;
  align-items: end;
  border: 1px solid var(--knowledge-line);
  border-radius: var(--knowledge-radius);
  background: #fff;
}
.knowledge-kicker { display: inline-flex; align-items: center; gap: 10px; margin-bottom: 12px; color: var(--knowledge-gold); font-size: 12px; font-weight: 750; }
.knowledge-kicker::before { width: 18px; height: 2px; background: currentColor; content: ""; }
.knowledge-index-head h1 { font-size: 40px; font-weight: 760; line-height: 1.25; }
.knowledge-index-head p { max-width: 720px; margin-top: 14px; color: var(--knowledge-copy); font-size: 16px; }
.knowledge-index-stat { padding-left: 24px; border-left: 1px solid var(--knowledge-line); }
.knowledge-index-stat strong { display: block; color: var(--knowledge-navy); font-size: 36px; font-variant-numeric: tabular-nums; line-height: 1; }
.knowledge-index-stat span { display: block; margin-top: 10px; font-size: 14px; font-weight: 700; }
.knowledge-index-stat small { display: block; margin-top: 4px; color: var(--knowledge-muted); font-size: 12px; }

.knowledge-browser { padding: 20px 0 88px; }
.knowledge-browser-grid { display: grid; grid-template-columns: minmax(0, 1fr) 260px; gap: 64px; align-items: start; }
.knowledge-controls { padding: 20px; border: 1px solid var(--knowledge-line); border-radius: var(--knowledge-radius); background: #fff; }
.knowledge-controls label { display: block; margin-bottom: 8px; color: var(--knowledge-copy); font-size: 12px; font-weight: 700; }
.knowledge-controls input { width: 100%; height: 46px; padding: 0 14px; border: 1px solid var(--knowledge-line-strong); border-radius: var(--knowledge-radius); outline: none; color: var(--knowledge-ink); background: #fff; font-size: 14px; }
.knowledge-controls input:focus-visible { border-color: #1766c2; outline: 3px solid rgba(23, 102, 194, 0.16); outline-offset: 1px; }
.knowledge-controls input:focus { border-color: var(--knowledge-navy); box-shadow: 0 0 0 3px rgba(30, 58, 95, 0.10); }
.knowledge-controls input::placeholder { color: var(--knowledge-muted); }
.knowledge-filters { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.knowledge-filter { min-height: 32px; padding: 0 12px; border: 1px solid var(--knowledge-line); border-radius: 6px; background: #fff; color: var(--knowledge-copy); cursor: pointer; font-size: 12px; font-weight: 650; }
.knowledge-filter:hover { border-color: var(--knowledge-line-strong); color: var(--knowledge-navy); }
.knowledge-filter.active { border-color: var(--knowledge-navy); background: var(--knowledge-navy); color: #fff; }
.knowledge-filter:focus-visible, .knowledge-controls input:focus-visible, .knowledge-page a:focus-visible, .knowledge-page summary:focus-visible { outline: 3px solid rgba(30, 58, 95, 0.22); outline-offset: 2px; }

.knowledge-list { display: grid; gap: 12px; margin-top: 12px; }
.knowledge-list-row {
  border: 1px solid var(--knowledge-line);
  border-radius: var(--knowledge-radius);
  background: #fff;
  overflow: hidden;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}
.knowledge-list-row[hidden] { display: none; }
.knowledge-list-row > a { min-height: 164px; display: grid; grid-template-columns: 48px minmax(0, 1fr) 92px; gap: 20px; align-items: start; padding: 24px; }
.knowledge-list-row > a:hover h2 { color: var(--knowledge-navy); }

@media (hover: hover) and (pointer: fine) {
  .knowledge-list-row:hover,
  .knowledge-list-row:focus-within {
    transform: translateY(-2px);
    border-color: var(--knowledge-line-strong);
    box-shadow: 0 8px 20px rgba(30, 58, 95, 0.08);
  }
}
.knowledge-row-number { padding-top: 2px; color: var(--knowledge-muted); font-size: 12px; font-weight: 700; font-variant-numeric: tabular-nums; }
.knowledge-row-meta { display: flex; align-items: center; gap: 12px; color: var(--knowledge-muted); font-size: 12px; }
.knowledge-row-meta b { color: var(--knowledge-gold); font-weight: 700; }
.knowledge-list-row h2 { margin-top: 8px; font-size: 21px; line-height: 1.45; transition: color 120ms ease; }
.knowledge-list-row p { max-width: 780px; margin-top: 8px; color: var(--knowledge-copy); font-size: 14px; line-height: 1.75; }
.knowledge-list-row > a > small { padding-top: 30px; color: var(--knowledge-muted); font-size: 12px; text-align: right; }
.knowledge-empty { padding: 28px 0; color: var(--knowledge-muted); font-size: 14px; }

.knowledge-index-side { position: sticky; top: 84px; display: grid; gap: 12px; }
.knowledge-index-side > section { padding: 20px; border: 1px solid var(--knowledge-line); border-radius: var(--knowledge-radius); background: #fff; }
.knowledge-index-side > section > span { color: var(--knowledge-copy); font-size: 12px; font-weight: 700; }
.knowledge-index-side ul { margin: 12px 0 0; padding: 0; list-style: none; }
.knowledge-index-side li { min-height: 36px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--knowledge-line); color: var(--knowledge-copy); font-size: 13px; }
.knowledge-index-side li b { color: var(--knowledge-muted); font-size: 12px; font-weight: 650; }
.knowledge-side-contact img { width: 112px; height: 112px; margin-top: 14px; object-fit: contain; }
.knowledge-side-contact strong { display: block; margin-top: 10px; font-size: 14px; }
.knowledge-side-contact p, .knowledge-side-contact span { display: block; margin-top: 5px; color: var(--knowledge-muted); font-size: 12px; line-height: 1.65; }

.knowledge-article { width: 100%; max-width: var(--site-nav-width, 1400px); margin: 0 auto; padding: 50px var(--site-nav-pad, 32px) 88px; }
.knowledge-article-header { max-width: calc(100% - 336px); }
.knowledge-article-meta { display: flex; flex-wrap: wrap; gap: 8px 16px; color: var(--knowledge-muted); font-size: 12px; }
.knowledge-article-meta a { color: var(--knowledge-gold); font-weight: 700; }
.knowledge-article-header h1 { margin-top: 16px; font-size: 38px; font-weight: 760; line-height: 1.35; }
.knowledge-lead { max-width: 920px; margin-top: 16px !important; color: var(--knowledge-copy); font-size: 17px; line-height: 1.8; }
.knowledge-article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 56px; align-items: start; margin-top: 38px; }
.knowledge-answer { padding: 20px 22px; border: 1px solid var(--knowledge-line); border-left: 4px solid var(--knowledge-gold); border-radius: var(--knowledge-radius); background: #fffdf7; }
.knowledge-answer > span { color: var(--knowledge-gold); font-size: 12px; font-weight: 750; }
.knowledge-answer p { margin-top: 7px; color: var(--knowledge-ink); font-size: 16px; line-height: 1.85; }
.knowledge-takeaways { margin-top: 28px; padding: 0 0 24px; border-bottom: 1px solid var(--knowledge-line); }
.knowledge-takeaways h2, .knowledge-sources h2, .knowledge-faq h2, .knowledge-tools h2, .knowledge-related h2 { font-size: 22px; line-height: 1.45; }
.knowledge-takeaways ul { display: grid; gap: 9px; margin: 14px 0 0; padding: 0; list-style: none; }
.knowledge-takeaways li { position: relative; padding-left: 18px; color: var(--knowledge-copy); font-size: 14px; }
.knowledge-takeaways li::before { position: absolute; top: 11px; left: 0; width: 5px; height: 5px; border-radius: 50%; background: var(--knowledge-green); content: ""; }

.knowledge-prose { color: #303846; font-size: 16px; line-height: 1.9; }
.knowledge-prose h2 { margin: 48px 0 16px; padding-top: 4px; color: var(--knowledge-ink); font-size: 25px; line-height: 1.45; }
.knowledge-prose h3 { margin: 30px 0 12px; color: var(--knowledge-ink); font-size: 19px; line-height: 1.5; }
.knowledge-prose p { margin: 14px 0; }
.knowledge-prose ul, .knowledge-prose ol { margin: 14px 0; padding-left: 24px; }
.knowledge-prose li { margin: 7px 0; }
.knowledge-prose strong { color: var(--knowledge-ink); }
.knowledge-prose a { color: var(--knowledge-navy); text-decoration: underline; text-underline-offset: 3px; }
.knowledge-prose blockquote { margin: 22px 0; padding: 14px 18px; border-left: 3px solid var(--knowledge-navy); background: var(--knowledge-navy-soft); color: var(--knowledge-copy); }
.knowledge-prose table { width: 100%; margin: 22px 0; border-collapse: collapse; font-size: 14px; }
.knowledge-prose th, .knowledge-prose td { padding: 11px 12px; border: 1px solid var(--knowledge-line); text-align: left; vertical-align: top; }
.knowledge-prose th { background: var(--knowledge-navy-soft); color: var(--knowledge-ink); font-weight: 700; }
.knowledge-prose code { padding: 2px 5px; border-radius: 4px; background: var(--knowledge-navy-soft); font-family: Consolas, monospace; font-size: 0.9em; }

.knowledge-sources, .knowledge-faq, .knowledge-tools, .knowledge-related {
  margin-top: 34px;
  padding: 24px;
  border: 1px solid var(--knowledge-line);
  border-radius: var(--knowledge-radius);
  background: var(--knowledge-white);
  box-shadow: 0 2px 8px rgba(24, 28, 34, 0.06);
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}
@media (hover: hover) and (pointer: fine) {
  .knowledge-sources:hover,
  .knowledge-sources:focus-within,
  .knowledge-faq:hover,
  .knowledge-faq:focus-within,
  .knowledge-tools:hover,
  .knowledge-tools:focus-within,
  .knowledge-related:hover,
  .knowledge-related:focus-within {
    transform: translateY(-2px);
    border-color: var(--knowledge-line-strong);
    box-shadow: 0 8px 20px rgba(30, 58, 95, 0.08);
  }
}
.knowledge-sources > summary { display: flex; align-items: center; justify-content: space-between; gap: 16px; cursor: pointer; color: var(--knowledge-ink); font-size: 16px; font-weight: 700; list-style: none; }
.knowledge-sources > summary::-webkit-details-marker { display: none; }
.knowledge-sources > summary::after { color: var(--knowledge-muted); font-size: 18px; font-weight: 400; content: "+"; }
.knowledge-sources[open] > summary::after { content: "−"; }
.knowledge-sources > summary small { margin-left: auto; color: var(--knowledge-muted); font-size: 12px; font-weight: 500; }
.knowledge-sources ol { display: grid; gap: 14px; margin: 18px 0 0; padding: 0; list-style: none; }
.knowledge-sources li { display: grid; grid-template-columns: 34px minmax(0, 1fr); gap: 10px; color: var(--knowledge-copy); font-size: 13px; }
.knowledge-sources li > span { color: var(--knowledge-muted); font-variant-numeric: tabular-nums; }
.knowledge-sources a { color: var(--knowledge-navy); font-weight: 650; text-decoration: underline; text-underline-offset: 3px; }
.knowledge-faq details { border-bottom: 1px solid var(--knowledge-line); }
.knowledge-faq details:last-child { border-bottom: 0; }
.knowledge-faq summary { min-height: 58px; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 12px 2px; cursor: pointer; font-size: 15px; font-weight: 700; list-style: none; }
.knowledge-faq summary::-webkit-details-marker { display: none; }
.knowledge-faq summary::after { color: var(--knowledge-muted); font-size: 20px; font-weight: 400; content: "+"; }
.knowledge-faq details[open] summary::after { content: "−"; }
.knowledge-faq details p { padding: 0 30px 18px 2px; color: var(--knowledge-copy); font-size: 14px; line-height: 1.8; }
.knowledge-tool-link, .knowledge-related-row { display: grid; border-bottom: 1px solid var(--knowledge-line); }
.knowledge-tool-link:last-child, .knowledge-related-row:last-child { border-bottom: 0; }
.knowledge-tool-link { grid-template-columns: 180px minmax(0, 1fr); gap: 20px; padding: 16px 0; }
.knowledge-tool-link strong { color: var(--knowledge-navy); font-size: 14px; }
.knowledge-tool-link span { color: var(--knowledge-copy); font-size: 13px; }
.knowledge-related-row { grid-template-columns: 90px minmax(0, 1fr) 90px; gap: 16px; align-items: center; padding: 16px 0; }
.knowledge-related-row span { color: var(--knowledge-gold); font-size: 12px; font-weight: 700; }
.knowledge-related-row strong { font-size: 14px; }
.knowledge-related-row small { color: var(--knowledge-muted); font-size: 12px; text-align: right; }
.knowledge-disclaimer { margin-top: 38px !important; padding-top: 18px; border-top: 1px solid var(--knowledge-line); color: var(--knowledge-muted); font-size: 12px; }

.knowledge-article-side { position: sticky; top: 84px; display: grid; gap: 28px; }
.knowledge-side-block { padding-top: 14px; border-top: 1px solid var(--knowledge-line-strong); }
.knowledge-side-block > strong { font-size: 13px; }
.knowledge-side-block ol { display: grid; gap: 9px; margin: 12px 0 0; padding: 0; list-style: none; }
.knowledge-side-block li a { display: block; color: var(--knowledge-copy); font-size: 12px; line-height: 1.55; }
.knowledge-side-block li a:hover { color: var(--knowledge-navy); }

.knowledge-footer { padding: 28px 0; background: #fff; }
.knowledge-footer-links { display: flex; justify-content: center; gap: 24px; font-size: 13px; }
.knowledge-footer-links a { color: var(--knowledge-copy); }
.knowledge-footer p { margin-top: 12px; color: var(--knowledge-muted); font-size: 12px; text-align: center; }

@media (max-width: 1100px) {
  .knowledge-index-head-grid, .knowledge-browser-grid, .knowledge-article-layout { grid-template-columns: 1fr; }
  .knowledge-index-head-grid { gap: 28px; }
  .knowledge-index-stat { padding: 16px 0 0; border-top: 1px solid var(--knowledge-line); border-left: 0; }
  .knowledge-browser-grid, .knowledge-article-layout { gap: 44px; }
  .knowledge-index-side, .knowledge-article-side { position: static; }
  .knowledge-index-side { grid-template-columns: 1fr 1fr; }
  .knowledge-article-side { grid-template-columns: minmax(0, 1fr) 220px; }
  .knowledge-article-header { max-width: none; }
}

@media (max-width: 720px) {
  .knowledge-shell { padding: 0 16px; }
  .knowledge-breadcrumbs [aria-current="page"] { max-width: 180px; }
  .knowledge-index-head { padding: 10px 12px 0; }
  .knowledge-index-head-grid { padding: 28px 20px; }
  .knowledge-index-head h1 { font-size: 30px; }
  .knowledge-index-head p { font-size: 15px; }
  .knowledge-list-row > a { grid-template-columns: 32px minmax(0, 1fr); gap: 10px; min-height: 0; padding: 20px; }
  .knowledge-list-row > a > small { grid-column: 2; padding-top: 0; text-align: left; }
  .knowledge-list-row h2 { font-size: 18px; }
  .knowledge-index-side, .knowledge-article-side { grid-template-columns: 1fr; }
  .knowledge-article { padding: 34px 16px 64px; }
  .knowledge-article-header h1 { font-size: 29px; }
  .knowledge-lead { font-size: 16px; }
  .knowledge-answer { padding: 18px; }
  .knowledge-sources, .knowledge-faq, .knowledge-tools, .knowledge-related { margin-top: 26px; padding: 20px; }
  .knowledge-prose { font-size: 15px; }
  .knowledge-prose h2 { margin-top: 40px; font-size: 22px; }
  .knowledge-tool-link, .knowledge-related-row { grid-template-columns: 1fr; gap: 5px; }
  .knowledge-related-row small { text-align: left; }
  .knowledge-footer-links { flex-wrap: wrap; gap: 10px 18px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: 0.01ms !important; }
  .knowledge-list-row:hover,
  .knowledge-list-row:focus-within,
  .knowledge-sources:hover,
  .knowledge-sources:focus-within,
  .knowledge-faq:hover,
  .knowledge-faq:focus-within,
  .knowledge-tools:hover,
  .knowledge-tools:focus-within,
  .knowledge-related:hover,
  .knowledge-related:focus-within { transform: none; }
}