:root {
  --paper: #ffffff;
  --ink: #152b36;
  --muted: #52636b;
  --rule: #dce3e7;
  --link: #20665c;
  --serif: "Noto Serif CJK SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif;
  --sans: "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}
* { box-sizing: border-box; }
html { background: var(--paper); color: var(--ink); }
body { margin: 0; font: 17px/1.8 var(--sans); -webkit-text-size-adjust: 100%; }
a { color: var(--link); text-decoration-thickness: 1px; text-underline-offset: .2em; }
a:hover { text-decoration: underline; }
a:focus-visible { outline: 2px solid var(--link); outline-offset: 5px; }
main:focus { outline: none; }
.site-shell { max-width: 1016px; padding: 0 48px; margin: 0 auto; }
.site-header { min-height: 100px; display: flex; align-items: center; justify-content: space-between; gap: 24px; border-bottom: 1px solid var(--rule); }
.wordmark { font: 700 27px/1.25 Georgia, var(--serif); color: var(--ink); text-decoration: none; white-space: nowrap; }
nav { display: flex; gap: 30px; font-size: 15px; }
nav a { color: var(--ink); text-decoration: none; padding: 8px 0; }
nav a[aria-current="page"] { text-decoration: underline; text-decoration-color: var(--rule); text-underline-offset: .5em; }
.intro { padding: 49px 0 45px; border-bottom: 1px solid var(--rule); }
h1, h2, h3 { font-family: var(--serif); line-height: 1.45; }
h1 { margin: 0; font-size: clamp(34px, 4.4vw, 52px); font-weight: 700; letter-spacing: -.025em; text-wrap: balance; }
.intro h1 { max-width: 860px; font-size: clamp(34px, 5.5vw, 60px); line-height: 1.5; }
.hero-line { display: block; }
.intro-sentence { display: block; }
.intro p { max-width: 660px; margin: 24px 0 0; color: var(--muted); font-size: 20px; line-height: 1.9; }
.latest { padding: 23px 0 31px; }
.section-heading { font-size: 25px; margin: 0 0 19px; }
.post-row { padding: 0 0 25px; }
.post-row + .post-row { padding-top: 25px; border-top: 1px solid var(--rule); }
.post-date, .post-meta { color: var(--muted); font-size: 14px; }
.post-row h3 { margin: 4px 0 8px; font-size: 25px; }
.post-row h3 a { text-decoration: none; }
.post-row h3 a:hover { text-decoration: underline; }
.post-row p { margin: 0 0 9px; color: var(--muted); font-size: 16px; }
.site-footer { margin-top: 0; padding: 22px 0 32px; display: flex; justify-content: space-between; align-items: baseline; gap: 16px; border-top: 1px solid var(--rule); color: var(--muted); font-size: 13px; }
.footer-brand { font: 16px Georgia, serif; color: var(--ink); text-decoration: none; }
.page-heading { padding: 44px 0 30px; }
.page-heading p { color: var(--muted); margin: 15px 0 0; }
.archive { padding-bottom: 50px; }
.archive h2 { font-size: 26px; margin: 0 0 12px; }
.archive-list { list-style: none; margin: 0; padding: 0; }
.archive-list li { display: grid; grid-template-columns: 105px 1fr; gap: 14px; padding: 18px 0; border-top: 1px solid var(--rule); }
.archive-list time { font-size: 14px; color: var(--muted); }
.archive-list a { text-decoration: none; }
.article { max-width: 740px; margin: 0 auto; padding-bottom: 55px; }
.article-header { padding: 42px 0 27px; border-bottom: 1px solid var(--rule); }
.article-header h1 { font-size: clamp(29px, 3.7vw, 40px); line-height: 1.6; margin: 14px 0; }
.back-link { font-size: 14px; }
.article-summary { color: var(--muted); margin: 0 0 15px; }
.disclosure { margin-top: 22px; padding-left: 14px; border-left: 3px solid var(--rule); font-size: 14px; color: var(--muted); }
.article-toc { padding: 22px 0; border-bottom: 1px solid var(--rule); font-size: 15px; }
.article-toc summary { cursor: pointer; font-weight: 600; width: fit-content; }
.article-toc ul { margin-bottom: 0; padding-left: 24px; }
.prose { margin-top: 30px; font-size: 18px; line-height: 1.95; overflow-wrap: anywhere; }
.prose h2 { margin: 40px 0 16px; font-size: 27px; scroll-margin-top: 24px; }
.prose h3 { margin: 32px 0 12px; font-size: 22px; }
.prose p { margin: 0 0 23px; }
.prose li { margin-bottom: 7px; }
.prose ul, .prose ol { padding-left: 1.5em; margin-bottom: 24px; }
.prose pre { background: #f4f7f8; padding: 20px; overflow-x: auto; font-size: 14px; line-height: 1.75; border: 1px solid var(--rule); }
.prose code { font-family: ui-monospace, "SFMono-Regular", Consolas, monospace; font-size: .88em; }
.prose :not(pre) > code { background: #f4f7f8; padding: 2px 4px; }
.prose blockquote { margin: 28px 0; padding-left: 18px; border-left: 3px solid var(--rule); color: var(--muted); }
.prose table { border-collapse: collapse; width: 100%; display: block; overflow-x: auto; }
.prose th, .prose td { border-bottom: 1px solid var(--rule); padding: 10px 16px; text-align: left; }
.article-end { padding-top: 24px; border-top: 1px solid var(--rule); margin-top: 36px; font-size: 15px; }
.empty { margin-bottom: 40px; color: var(--muted); }
.skip-link { position: absolute; left: 16px; top: -80px; background: white; padding: 8px 16px; z-index: 1; }
.skip-link:focus { top: 8px; }
@media (max-width: 640px) {
  body { font-size: 17px; }
  .site-shell { padding: 0 24px; }
  .site-header { min-height: 86px; gap: 14px; }
  .wordmark { font-size: 22px; }
  nav { gap: 18px; font-size: 14px; }
  .intro { padding: 28px 0 30px; }
  .intro h1 { font-size: 34px; line-height: 1.65; text-wrap: initial; }
  .hero-line + .hero-line { max-width: 228px; }
  .intro p { font-size: 17px; margin-top: 20px; line-height: 1.9; }
  .intro-sentence { display: inline; }
  .latest { padding: 20px 0 15px; }
  .section-heading { font-size: 24px; margin-bottom: 17px; }
  .post-row h3 { font-size: 23px; line-height: 1.6; }
  .post-row p { font-size: 16px; }
  .site-footer { display: grid; grid-template-columns: 1fr auto; gap: 4px 12px; font-size: 12px; padding-top: 19px; }
  .site-footer > span { grid-column: 1 / -1; grid-row: 2; }
  .archive-list li { grid-template-columns: 1fr; gap: 4px; }
  .page-heading { padding: 30px 0 25px; }
  .article-header { padding-top: 27px; }
  .article-header h1 { font-size: 29px; }
  .prose { font-size: 17px; }
  .prose h2 { font-size: 25px; }
  .prose pre { padding: 14px; }
}
@media (max-width: 360px) {
  .site-shell { padding: 0 18px; }
  .wordmark { font-size: 20px; }
  nav { gap: 12px; }
  .intro h1 { font-size: 31px; }
}
@media print {
  nav, .article-toc, .back-link, .site-footer, .skip-link { display: none; }
  .site-shell { max-width: none; padding: 0; }
  .article { max-width: none; }
  .prose pre { white-space: pre-wrap; }
}