:root {
  --paper: #f5f1e6;
  --ink: #111b2c;
  --blue: #234ea3;
  --gold: #80611f;
  --line: #d6d0c3;
  --soft-ink: #4d5360;
  --serif: Georgia, "Noto Serif SC", "Source Han Serif SC", "Songti SC", SimSun, serif;
  --mono: "Cascadia Code", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-padding-top: 100px; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--serif); font-size: 16px; line-height: 1.75; -webkit-font-smoothing: antialiased; }
button, input { font: inherit; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }
a, button, input, summary { -webkit-tap-highlight-color: transparent; }
a:focus-visible, button:focus-visible, input:focus-visible, summary:focus-visible { outline: 2px solid var(--blue); outline-offset: 4px; }
a:hover { color: var(--blue); }
::selection { background: #dce3ef; color: var(--ink); }
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.skip-link { position: fixed; top: 8px; left: 12px; z-index: 20; padding: 8px 14px; background: var(--ink); color: var(--paper); transform: translateY(-180%); }
.skip-link:focus { transform: translateY(0); }
.site-header { border-bottom: 1px solid var(--line); }
.site-header-inner, .page-main, .site-footer-inner { width: min(1120px, calc(100% - 80px)); margin-inline: auto; }
.site-header-inner { min-height: 86px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { font-size: 23px; font-weight: 700; line-height: 1.3; letter-spacing: -.6px; white-space: nowrap; }
.brand span { color: var(--gold); font-weight: 400; }
.site-nav { display: flex; gap: 30px; align-items: center; font-size: 14px; }
.site-nav a { padding-block: 7px; white-space: nowrap; }
.site-nav .is-current { color: var(--blue); border-bottom: 1px solid var(--blue); }
.page-main { min-height: calc(100svh - 210px); padding-bottom: 90px; }
.blog-intro { padding-block: 70px 52px; }
.eyebrow { color: var(--gold); font-size: 11px; letter-spacing: 2px; margin: 0 0 16px; line-height: 1.8; }
.blog-intro h1 { margin: 0; font-size: clamp(56px, 6.4vw, 78px); font-weight: 400; letter-spacing: -3px; line-height: 1.12; }
.title-period { color: var(--gold); }
.blog-intro-description { margin: 21px 0 0; color: var(--soft-ink); font-size: 17px; }
.listing-layout { display: grid; grid-template-columns: 236px minmax(0, 1fr); gap: 64px; padding-top: 28px; border-top: 1px solid var(--line); }
.category-sidebar { min-width: 0; }
.category-sidebar nav { position: sticky; top: 28px; }
.index-title { margin: 0 0 22px; font-size: 13px; font-weight: 400; color: var(--ink); letter-spacing: .6px; }
.index-title span { margin-left: 7px; color: var(--soft-ink); font-size: 10px; letter-spacing: 1px; }
.category-list { list-style: none; padding: 0; margin: 0; }
.category-link { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 13px; margin: 0 0 3px; border-left: 2px solid transparent; line-height: 1.55; font-size: 15px; }
.category-link.is-active { color: var(--blue); background: #234ea308; border-left-color: var(--blue); }
.category-link:hover { background: #234ea308; }
.category-name { min-width: 0; overflow-wrap: anywhere; }
.category-count { flex: 0 0 auto; color: var(--soft-ink); font-size: 12px; font-variant-numeric: tabular-nums; }
.is-active .category-count { color: var(--blue); }
.index-note { padding: 23px 13px 0; margin-top: 22px; border-top: 1px solid var(--line); font-size: 12px; color: var(--soft-ink); }
.entries-section { min-width: 0; }
.entries-heading h2 { display: flex; align-items: baseline; gap: 12px; margin: -5px 0 4px; font-size: 25px; font-weight: 400; }
.entries-total { color: var(--gold); font-size: 13px; font-variant-numeric: tabular-nums; }
.entries-heading p { margin: 0; color: var(--soft-ink); font-size: 14px; }
.search-area { margin-top: 24px; }
.search-field { display: flex; align-items: center; gap: 12px; min-width: 0; min-height: 47px; border: 1px solid var(--line); border-radius: 2px; padding: 0 14px; background: #fff3; }
.search-field:focus-within { border-color: var(--blue); }
.search-field > svg { width: 19px; height: 19px; flex: 0 0 19px; color: var(--soft-ink); }
.search-field input { width: 100%; min-width: 0; padding: 11px 0; border: 0; border-radius: 0; outline: 0; background: transparent; color: var(--ink); font-size: 14px; }
.search-field input:focus-visible { outline: none; }
.search-field input::placeholder { color: #666972; opacity: 1; }
.search-field input::-webkit-search-cancel-button { display: none; }
.search-clear { flex: 0 0 auto; padding: 4px 0 4px 7px; border: 0; background: none; color: var(--blue); font-size: 12px; }
.search-status { min-height: 20px; margin: 5px 0 0; color: var(--soft-ink); font-size: 12px; }
.post-list { margin-top: 3px; }
.post-card { padding: 28px 0 30px; border-bottom: 1px solid var(--line); }
.post-meta, .article-meta { display: flex; flex-wrap: wrap; align-items: center; column-gap: 16px; row-gap: 4px; font-size: 12px; color: var(--soft-ink); }
.post-category { color: var(--gold); }
.post-card h3 { margin: 12px 0 10px; font-size: 24px; font-weight: 400; line-height: 1.55; overflow-wrap: anywhere; }
.post-card h3 a { display: flex; justify-content: space-between; align-items: flex-start; gap: 20px; }
.post-card h3 svg { width: 22px; height: 22px; flex: 0 0 22px; margin-top: 7px; color: var(--blue); }
.post-summary { margin: 0; color: var(--soft-ink); font-size: 15px; line-height: 1.9; overflow-wrap: anywhere; }
.tag-list { display: flex; flex-wrap: wrap; gap: 5px 12px; list-style: none; padding: 0; margin: 16px 0 0; color: var(--soft-ink); font-size: 11px; }
.tag-list li { overflow-wrap: anywhere; max-width: 100%; }
.tag-list li::before { content: "#"; color: var(--gold); margin-right: 3px; }
.empty-state { padding: 62px 18px 70px; text-align: center; border-bottom: 1px solid var(--line); }
.empty-mark { color: var(--gold); font-family: var(--mono); font-size: 28px; font-weight: 300; }
.empty-state h3 { margin: 18px 0 8px; font-size: 20px; font-weight: 400; }
.empty-state p { margin: 0; color: var(--soft-ink); font-size: 14px; }
.text-button { display: inline-flex; align-items: center; gap: 8px; padding: 8px 0; margin-top: 16px; background: none; color: var(--blue); border: 0; font-size: 14px; }
.text-button svg { width: 18px; height: 18px; }
.no-script-note { font-size: 12px; color: var(--soft-ink); }
.site-footer { border-top: 1px solid var(--line); }
.site-footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-block: 28px; color: var(--soft-ink); font-size: 12px; }
.footer-separator { color: var(--gold); padding-inline: 7px; }
.site-footer a { white-space: nowrap; }

.article-layout { display: grid; grid-template-columns: minmax(0, 780px) minmax(0, 230px); gap: 70px; padding-top: 42px; }
.article-layout.without-toc { display: block; max-width: 780px; margin-inline: auto; }
.article-content { min-width: 0; }
.back-link { display: inline-flex; align-items: center; gap: 9px; color: var(--soft-ink); font-size: 13px; }
.article-category { margin: 43px 0 13px; font-size: 13px; color: var(--gold); }
.article-header h1 { margin: 0; font-size: clamp(32px, 3.7vw, 44px); line-height: 1.45; font-weight: 400; letter-spacing: -.7px; overflow-wrap: anywhere; }
.article-summary { margin: 22px 0 0; color: var(--soft-ink); font-size: 17px; line-height: 1.95; overflow-wrap: anywhere; }
.article-meta { margin-top: 24px; padding-bottom: 30px; border-bottom: 1px solid var(--line); }
.prose { padding-top: 20px; font-size: 17px; line-height: 1.95; overflow-wrap: anywhere; }
.prose > :first-child { margin-top: 16px; }
.prose p { margin: 1.25em 0; }
.prose h1, .prose h2, .prose h3, .prose h4, .prose h5, .prose h6 { line-height: 1.55; font-weight: 600; scroll-margin-top: 35px; }
.prose h1 { font-size: 1.8em; margin: 2em 0 .85em; }
.prose h2 { font-size: 1.5em; margin: 2.2em 0 .9em; padding-bottom: .45em; border-bottom: 1px solid var(--line); }
.prose h3 { font-size: 1.22em; margin: 1.8em 0 .75em; }
.prose h4, .prose h5, .prose h6 { font-size: 1em; margin: 1.5em 0 .65em; }
.prose a { color: var(--blue); text-decoration: underline; text-underline-offset: 4px; text-decoration-thickness: 1px; }
.prose a:hover { text-decoration-thickness: 2px; }
.prose ul, .prose ol { padding-left: 1.6em; margin: 1.2em 0; }
.prose li { margin-block: .35em; }
.prose li > p { margin-block: .6em; }
.prose blockquote { border-left: 2px solid var(--gold); padding: .15em 1.3em; margin: 1.6em 0; color: var(--soft-ink); background: #80611f05; }
.prose blockquote > :first-child { margin-top: .55em; }
.prose blockquote > :last-child { margin-bottom: .55em; }
.prose hr { margin: 2.5em 0; border: 0; border-top: 1px solid var(--line); }
.prose img, .prose video { display: block; max-width: 100%; height: auto; margin: 1.5em auto; }
.prose figure { margin: 1.5em 0; }
.prose figcaption { margin-top: .6em; color: var(--soft-ink); text-align: center; font-size: .8em; }
.prose code { font-family: var(--mono); font-size: .85em; padding: .15em .35em; border-radius: 2px; background: #111b2c08; }
.prose pre { max-width: 100%; overflow-x: auto; margin: 1.6em 0; padding: 22px 24px; border: 1px solid var(--line); border-radius: 2px; background: #eeece5; font-size: 14px; line-height: 1.75; tab-size: 4; }
.prose pre code { display: block; padding: 0; background: transparent; white-space: pre; overflow-wrap: normal; word-break: normal; font-size: inherit; }
.prose pre code.hljs { padding: 0; color: var(--ink); background: transparent; }
.code-block-wrap { position: relative; min-width: 0; margin: 1.6em 0; padding-top: 36px; border: 1px solid var(--line); border-radius: 2px; background: #eeece5; }
.code-block-wrap pre { border: 0; margin: 0; padding-top: 8px; }
.copy-code { position: absolute; top: 6px; right: 10px; padding: 3px 8px; border: 1px solid transparent; background: transparent; color: var(--soft-ink); font-family: var(--serif); font-size: 11px; line-height: 1.6; }
.copy-code:hover { color: var(--blue); border-color: var(--line); }
.copy-code:disabled { cursor: wait; }
.copy-buffer { position: fixed; width: 1px; height: 1px; left: -10000px; top: 0; opacity: 0; }
.prose table { display: block; width: max-content; max-width: 100%; overflow-x: auto; border-collapse: collapse; margin: 1.6em 0; font-size: .88em; line-height: 1.7; }
.prose th, .prose td { padding: 10px 14px; border: 1px solid var(--line); min-width: 80px; vertical-align: top; }
.prose th { background: #111b2c05; text-align: left; font-weight: 600; }
.prose .katex { font-size: 1.06em; }
.prose .katex-display { max-width: 100%; overflow-x: auto; overflow-y: hidden; padding-block: 8px; margin: 1.5em 0; }
.prose .katex:not(.katex-display .katex) { max-width: 100%; display: inline-block; overflow-x: auto; overflow-y: hidden; vertical-align: middle; }
.prose .footnotes { border-top: 1px solid var(--line); margin-top: 3em; color: var(--soft-ink); font-size: .82em; }
.article-footer { margin-top: 54px; padding-top: 22px; border-top: 1px solid var(--line); }
.article-footer .tag-list { margin-top: 0; margin-bottom: 26px; }
.desktop-toc { min-width: 0; padding-top: 112px; }
.toc-sticky { position: sticky; top: 35px; max-height: calc(100svh - 70px); overflow-y: auto; padding-right: 7px; }
.toc-sticky .index-title { margin-bottom: 17px; }
.toc-nav ol { padding: 0; margin: 0; list-style: none; }
.toc-nav li { margin: 0; }
.toc-nav a { display: block; padding: 7px 0 7px 14px; border-left: 1px solid var(--line); color: var(--soft-ink); font-size: 13px; line-height: 1.75; overflow-wrap: anywhere; }
.toc-nav .toc-level-3 a { padding-left: 27px; font-size: 12px; }
.toc-nav a:hover, .toc-nav a.is-active { color: var(--blue); border-left-color: var(--blue); }
.mobile-toc { display: none; }

@media (max-width: 1000px) {
  .site-header-inner, .page-main, .site-footer-inner { width: calc(100% - 56px); }
  .listing-layout { grid-template-columns: 200px minmax(0, 1fr); gap: 38px; }
  .article-layout { grid-template-columns: minmax(0, 1fr) 190px; gap: 35px; }
  .toc-sticky .index-title span { display: none; }
}

@media (max-width: 760px) {
  .site-header-inner, .page-main, .site-footer-inner { width: calc(100% - 40px); }
  .site-header-inner { min-height: 72px; }
  .brand { font-size: 21px; }
  .site-nav { gap: 20px; font-size: 13px; }
  .page-main { padding-bottom: 62px; }
  .blog-intro { padding-block: 48px 36px; }
  .eyebrow { font-size: 10px; letter-spacing: 1.5px; margin-bottom: 14px; }
  .blog-intro h1 { font-size: 60px; }
  .blog-intro-description { font-size: 15px; margin-top: 18px; }
  .listing-layout { display: block; padding-top: 22px; }
  .category-sidebar nav { position: static; }
  .index-title { margin-bottom: 14px; }
  .category-list { display: flex; flex-wrap: wrap; gap: 7px; }
  .category-list li { max-width: 100%; }
  .category-link { margin: 0; border: 1px solid var(--line); padding: 7px 10px; gap: 9px; font-size: 12px; }
  .category-link.is-active { border-color: var(--blue); }
  .category-count { font-size: 10px; }
  .index-note { display: none; }
  .entries-section { margin-top: 34px; padding-top: 28px; border-top: 1px solid var(--line); }
  .entries-heading h2 { font-size: 23px; }
  .search-area { margin-top: 20px; }
  .post-card { padding-block: 25px; }
  .post-card h3 { font-size: 22px; }
  .post-meta { column-gap: 12px; font-size: 11px; }
  .empty-state { padding: 45px 0 55px; }
  .empty-state h3 { font-size: 19px; }
  .site-footer-inner { flex-wrap: wrap; padding-block: 22px; gap: 7px 18px; font-size: 11px; }
  .article-layout, .article-layout.without-toc { display: block; padding-top: 29px; }
  .article-category { margin-top: 30px; }
  .article-header h1 { font-size: 32px; }
  .article-summary { font-size: 16px; margin-top: 18px; }
  .article-meta { column-gap: 14px; font-size: 11px; padding-bottom: 23px; margin-top: 20px; }
  .desktop-toc { display: none; }
  .mobile-toc { display: block; margin-top: 20px; border: 1px solid var(--line); }
  .mobile-toc summary { cursor: pointer; padding: 11px 14px; font-size: 13px; color: var(--soft-ink); }
  .mobile-toc summary span { float: right; color: var(--gold); }
  .mobile-toc[open] summary { border-bottom: 1px solid var(--line); }
  .mobile-toc[open] summary span { transform: rotate(45deg); }
  .mobile-toc .toc-nav { padding: 10px 14px; }
  .prose { padding-top: 12px; font-size: 16px; }
  .prose h2 { font-size: 1.35em; }
  .prose h3 { font-size: 1.16em; }
  .prose pre { padding-inline: 16px; font-size: 12px; }
  .prose blockquote { padding-inline: 1em; }
  .prose th, .prose td { padding: 8px 10px; }
}

@media (max-width: 375px) {
  .site-header-inner, .page-main, .site-footer-inner { width: calc(100% - 32px); }
  .site-header-inner { gap: 12px; }
  .brand { font-size: 19px; }
  .site-nav { gap: 14px; font-size: 12px; }
  .blog-intro h1 { font-size: 54px; }
  .eyebrow { font-size: 9px; letter-spacing: 1px; }
  .blog-intro-description { font-size: 14px; }
  .search-field { gap: 9px; padding-inline: 10px; }
  .search-field input { font-size: 12px; }
  .article-header h1 { font-size: 28px; }
  .post-card h3 { font-size: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation: none !important; transition: none !important; }
}

@media print {
  body { background: white; font-size: 11pt; }
  .site-header, .site-footer, .desktop-toc, .mobile-toc, .copy-code, .back-link, .skip-link { display: none; }
  .page-main { width: 100%; padding: 0; }
  .article-layout { display: block; padding: 0; }
  .prose pre, .prose table, .prose .katex-display { overflow: visible; }
  .prose pre code { white-space: pre-wrap; }
  .prose h2, .prose h3 { break-after: avoid; }
  .prose img, .prose pre { break-inside: avoid; }
}