:root {
  color-scheme: light;
  --page: #f6f8fb;
  --surface: #ffffff;
  --text: #182230;
  --muted: #667085;
  --line: #e5e9f0;
  --accent: #167b68;
  --accent-soft: #eaf6f2;
  --shadow: 0 18px 50px rgba(24, 34, 48, .07);
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--page);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
a:focus-visible { outline: 3px solid rgba(22, 123, 104, .28); outline-offset: 3px; border-radius: 6px; }
.site-header { background: rgba(255, 255, 255, .94); border-bottom: 1px solid var(--line); }
.site-header__inner { width: min(1120px, calc(100% - 40px)); min-height: 76px; margin: 0 auto; display: flex; align-items: center; gap: 13px; }
.brand-mark { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 12px; background: var(--accent); color: #fff; font-size: 18px; font-weight: 750; box-shadow: 0 8px 20px rgba(22, 123, 104, .2); }
.site-name, .site-tagline, .eyebrow, .related-title, .site-footer p { margin: 0; }
.site-name { font-size: 17px; line-height: 1.35; font-weight: 720; letter-spacing: .01em; }
.site-tagline { margin-top: 2px; color: var(--muted); font-size: 12px; letter-spacing: .08em; }
.site-shell { width: min(1120px, calc(100% - 40px)); margin: 0 auto; padding: 26px 0 56px; }
.breadcrumbs { margin-bottom: 18px; color: var(--muted); font-size: 13px; }
.breadcrumbs ol { display: flex; align-items: center; gap: 8px; margin: 0; padding: 0; list-style: none; overflow-x: auto; white-space: nowrap; scrollbar-width: none; }
.breadcrumbs li { display: flex; align-items: center; }
.breadcrumbs li:not(:last-child)::after { content: "/"; margin-left: 8px; color: #b5bdc9; }
.breadcrumbs a:hover { color: var(--accent); }
.page-layout { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 24px; align-items: start; }
.content-card, .related-content { background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow); }
.content-card { border-radius: 18px; overflow: hidden; }
.article-header { padding: 38px 42px 26px; border-bottom: 1px solid var(--line); background: linear-gradient(180deg, #fff 0%, #fbfcfd 100%); }
.eyebrow { color: var(--accent); font-size: 12px; font-weight: 750; letter-spacing: .14em; }
h1 { max-width: 22em; margin: 8px 0 14px; font-size: clamp(30px, 4vw, 44px); line-height: 1.22; letter-spacing: -.035em; overflow-wrap: anywhere; }
.article-meta { display: flex; flex-wrap: wrap; gap: 6px 16px; color: var(--muted); font-size: 13px; }
.article-body { padding: 32px 42px 42px; font-size: 17px; }
.article-body p { margin: 0 0 1.15em; overflow-wrap: anywhere; }
.article-body p:last-child { margin-bottom: 0; }
.article-body h2 { position: relative; margin: 2em 0 .75em; padding-left: 14px; font-size: 22px; line-height: 1.45; letter-spacing: -.015em; }
.article-body h2:first-child { margin-top: 0; }
.article-body h2::before { content: ""; position: absolute; left: 0; top: .26em; width: 4px; height: 1em; border-radius: 999px; background: var(--accent); }
.home-lead { max-width: 48em; color: #475467; font-size: 18px; }
.directory-section { margin-top: 34px; }
.directory-section header { margin-bottom: 16px; }
.directory-section header h2 { margin-bottom: 6px; }
.directory-section header p { color: var(--muted); font-size: 14px; }
.directory-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin: 0; padding: 0; list-style: none; }
.directory-grid a { display: flex; min-height: 128px; flex-direction: column; gap: 9px; padding: 16px 17px; border: 1px solid var(--line); border-radius: 13px; background: #fbfcfd; transition: border-color .16s ease, background-color .16s ease, transform .16s ease; }
.directory-grid a:hover { border-color: rgba(22, 123, 104, .35); background: var(--accent-soft); transform: translateY(-1px); }
.directory-grid span { font-weight: 680; line-height: 1.5; overflow-wrap: anywhere; }
.directory-grid p { display: -webkit-box; margin: 0; overflow: hidden; color: var(--muted); font-size: 13px; line-height: 1.65; -webkit-box-orient: vertical; -webkit-line-clamp: 3; }
.directory-grid small { margin-top: auto; color: var(--accent); font-size: 12px; }
.related-content { position: sticky; top: 20px; padding: 22px; border-radius: 16px; }
.related-title { margin-bottom: 12px; font-size: 15px; font-weight: 750; }
.related-content ul { display: grid; gap: 8px; margin: 0; padding: 0; list-style: none; }
.related-content a { position: relative; display: block; padding: 10px 30px 10px 12px; border-radius: 10px; color: #344054; font-size: 14px; line-height: 1.5; overflow-wrap: anywhere; transition: background-color .16s ease, color .16s ease; }
.related-content a::after { content: "→"; position: absolute; right: 11px; color: #98a2b3; }
.related-content a:hover { background: var(--accent-soft); color: var(--accent); }
.site-footer { width: min(1120px, calc(100% - 40px)); margin: 0 auto; padding: 0 0 32px; color: var(--muted); font-size: 12px; text-align: center; }
@media (max-width: 880px) {
  .page-layout { grid-template-columns: 1fr; }
  .related-content { position: static; }
}
@media (max-width: 760px) {
  .site-header__inner, .site-shell, .site-footer { width: min(100% - 28px, 1120px); }
  .site-header__inner { min-height: 66px; }
  .site-shell { padding-top: 18px; }
  .breadcrumbs { margin-bottom: 13px; }
  .page-layout { gap: 15px; }
  .content-card, .related-content { border-radius: 14px; box-shadow: 0 10px 30px rgba(24, 34, 48, .05); }
  .article-header { padding: 27px 22px 20px; }
  h1 { margin-top: 7px; font-size: clamp(27px, 9vw, 36px); }
  .article-body { padding: 24px 22px 30px; font-size: 16px; line-height: 1.82; }
  .article-body h2 { font-size: 20px; }
  .home-lead { font-size: 16px; }
  .directory-section { margin-top: 28px; }
  .directory-grid { grid-template-columns: 1fr; gap: 10px; }
  .directory-grid a { min-height: 116px; }
  .related-content { padding: 18px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .related-content a, .directory-grid a { transition: none; }
}