:root {
  --paper: #faf9f6;
  --surface: #fdfcfa;
  --surface-strong: #ffffff;
  --ink: #201d18;
  --ink-soft: #4a463f;
  --muted: #6f6a61;
  --faint: #8d887e;
  --line: #e6e2d8;
  --line-soft: #efece4;
  --blue: #2a78d6;
  --blue-ink: #1c5cab;
  --blue-wash: #eaf1fb;
  --sienna: #bd5f16;
  --sienna-ink: #9a4a0b;
  --sienna-wash: #f9efe3;
  --header-h: 64px;
  --sidebar-w: 312px;
  --rail-w: 220px;
  --content-w: 780px;
  --shadow: 0 12px 40px rgba(32, 29, 24, .07);
}

html[data-theme="dark"] {
  --paper: #171612;
  --surface: #1e1c18;
  --surface-strong: #24211c;
  --ink: #f1ede4;
  --ink-soft: #d3cdc2;
  --muted: #aaa397;
  --faint: #8d867b;
  --line: #38342d;
  --line-soft: #2c2924;
  --blue: #6aa7ed;
  --blue-ink: #86b9f2;
  --blue-wash: #1b2d42;
  --sienna: #df8a46;
  --sienna-ink: #e99b5c;
  --sienna-wash: #342419;
  --shadow: 0 12px 40px rgba(0, 0, 0, .22);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 22px); }
body {
  margin: 0;
  overflow-x: hidden;
  background: var(--paper);
  color: var(--ink-soft);
  font-family: Georgia, "Times New Roman", "STSong", serif;
  font-size: 17px;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: var(--blue-ink); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
button, input { font: inherit; }
::selection { background: color-mix(in srgb, var(--blue) 22%, transparent); }

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--header-h);
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr) auto;
  align-items: center;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 91%, transparent);
  backdrop-filter: blur(14px) saturate(140%);
}
.brand {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 0 20px;
  color: var(--ink);
  font-family: "Trebuchet MS", Arial, sans-serif;
  font-weight: 700;
  letter-spacing: -.015em;
  border-right: 1px solid var(--line);
  white-space: nowrap;
}
.brand:hover { text-decoration: none; }
.brand-mark {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border-radius: 8px;
  background: var(--blue-wash);
  color: var(--blue-ink);
  font-size: 14px;
}
.header-context {
  min-width: 0;
  padding: 0 24px;
  overflow: hidden;
  color: var(--muted);
  font-family: "Trebuchet MS", Arial, sans-serif;
  font-size: 14px;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.header-actions { display: flex; gap: 7px; align-items: center; padding-right: 18px; }
.icon-button, .text-button {
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink-soft);
  cursor: pointer;
}
.icon-button { display: grid; width: 38px; place-items: center; padding: 0; }
.text-button { display: inline-flex; align-items: center; gap: 7px; padding: 0 12px; font: 600 13px/1 "Trebuchet MS", Arial, sans-serif; }
.icon-button:hover, .text-button:hover { border-color: color-mix(in srgb, var(--blue) 35%, var(--line)); background: var(--blue-wash); color: var(--blue-ink); text-decoration: none; }
.menu-button { display: none; }

.book-sidebar {
  position: fixed;
  z-index: 60;
  top: var(--header-h);
  bottom: 0;
  left: 0;
  width: var(--sidebar-w);
  overflow-y: auto;
  padding: 20px 16px 40px;
  border-right: 1px solid var(--line);
  background: var(--paper);
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}
.sidebar-label {
  margin: 0 8px 9px;
  color: var(--faint);
  font: 700 10px/1.4 "Trebuchet MS", Arial, sans-serif;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.book-nav { font-family: "Trebuchet MS", Arial, sans-serif; font-size: 13.5px; line-height: 1.35; }
.nav-part { margin: 21px 8px 8px; color: var(--sienna-ink); font-size: 11px; font-weight: 700; letter-spacing: .07em; text-transform: uppercase; }
.nav-part:first-child { margin-top: 0; }
.nav-link {
  display: flex;
  gap: 8px;
  margin: 2px 0;
  padding: 7px 9px;
  border-radius: 7px;
  color: var(--muted);
}
.nav-link:hover { background: var(--line-soft); color: var(--ink); text-decoration: none; }
.nav-link.active { background: var(--blue-wash); color: var(--blue-ink); font-weight: 700; }
.nav-link.sub { padding-left: 26px; font-size: 12.5px; }
.nav-number { min-width: 27px; color: var(--faint); font-variant-numeric: tabular-nums; }
.nav-link.active .nav-number { color: var(--blue-ink); }

.reading-progress { position: fixed; z-index: 110; top: 0; left: 0; width: 0; height: 2px; background: var(--blue); transition: width .08s linear; }
.reader-shell { min-height: 100vh; padding: calc(var(--header-h) + 36px) calc(var(--rail-w) + 42px) 80px calc(var(--sidebar-w) + 42px); }
.reader-main { width: 100%; max-width: var(--content-w); min-width: 0; margin: 0 auto; }
.document-page { width: 100%; max-width: 100%; min-width: 0; overflow-wrap: break-word; }

.breadcrumbs { margin-bottom: 16px; color: var(--faint); font: 12px/1.5 "Trebuchet MS", Arial, sans-serif; }
.breadcrumbs a { color: var(--muted); }
.page-kicker { margin: 0 0 7px; color: var(--sienna-ink); font: 700 11px/1.4 "Trebuchet MS", Arial, sans-serif; letter-spacing: .1em; text-transform: uppercase; }
.page-title, .document-page .sectionHead, .document-page .subsectionHead, .document-page .partHead, .document-page .likesectionHead {
  margin: 0 0 22px;
  color: var(--ink);
  font-family: "Trebuchet MS", Arial, sans-serif;
  font-weight: 700;
  letter-spacing: -.025em;
  line-height: 1.16;
}
.document-page .sectionHead { font-size: clamp(31px, 4.3vw, 46px); }
.document-page .subsectionHead { font-size: clamp(27px, 3.7vw, 39px); }
.document-page .partHead { font-size: clamp(32px, 4.7vw, 48px); text-align: left; }
.document-page .titlemark { display: block; margin-bottom: 9px; color: var(--blue-ink); font-size: .38em; letter-spacing: .08em; }
.document-page .subsubsectionHead {
  margin: 2.25em 0 .7em;
  color: var(--ink);
  font: 700 22px/1.3 "Trebuchet MS", Arial, sans-serif;
  letter-spacing: -.015em;
}
.document-page .paragraphHead { margin: 1.5em 0 .25em; color: var(--sienna-ink); font: 700 16px/1.4 "Trebuchet MS", Arial, sans-serif; }
.document-page p { margin: 0 0 .88em; }
.document-page p.noindent { text-indent: 0; }
.document-page strong, .document-page [class*="Bold"] { color: var(--ink); font-weight: 700; }
.document-page img { max-width: 100%; height: auto; }
.document-page figure, .document-page .figure, .document-page .float { margin: 2em auto; text-align: center; }
.document-page .caption { margin-top: .75em; color: var(--muted); font-size: 14px; line-height: 1.5; }
.document-page .caption .id { color: var(--ink); font-family: "Trebuchet MS", Arial, sans-serif; font-weight: 700; }

.document-page ul, .document-page ol { margin: .65em 0 1.1em; padding-left: 1.4em; }
.document-page li { margin: .3em 0; padding-left: .15em; }
.document-page li::marker { color: var(--blue); }
dl.enumerate-enumitem { display: grid; grid-template-columns: auto 1fr; gap: .18em .7em; margin: .65em 0 1.1em; }
dl.enumerate-enumitem dt { color: var(--blue-ink); font-family: "Trebuchet MS", Arial, sans-serif; font-weight: 700; }
dl.enumerate-enumitem dd { margin: 0; }

.mathjax-block, .math-display, .par-math-display, .mathjax-env {
  max-width: 100%;
  margin: 1.2em 0;
  padding: .2em 0;
  overflow-x: auto;
  overflow-y: hidden;
  text-align: center;
  scrollbar-width: thin;
}
.MathJax { color: var(--ink); }
table.equation, table.eqnarray, table.eqnarray-star { width: 100%; }
table { max-width: 100%; border-collapse: collapse; }
.document-page .tabular { max-width: 100%; margin: 1.5em 0; overflow-x: auto; }
.document-page table.tabular { margin: 0 auto; }
.document-page table.tabular td { padding: .55em .75em; border-color: var(--line); }

.theorem-card {
  position: relative;
  margin: 1.25em 0;
  padding: 18px 20px 17px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--blue);
  border-radius: 9px;
  background: var(--surface);
  box-shadow: 0 1px 2px rgba(32, 29, 24, .025);
}
.theorem-card.definition { border-left-color: var(--sienna); background: color-mix(in srgb, var(--sienna-wash) 58%, var(--surface)); }
.theorem-card.remark, .theorem-card.example, .theorem-card.observation, .theorem-card.approach { border-left-color: var(--faint); }
.theorem-card .head { display: inline; color: var(--ink); font-family: "Trebuchet MS", Arial, sans-serif; font-weight: 700; }
.theorem-card p:last-child { margin-bottom: 0; }
.proof { margin: 1.25em 0 1.65em; padding-left: 17px; border-left: 1px solid var(--line); }
.proof .head { color: var(--sienna-ink); font-family: "Trebuchet MS", Arial, sans-serif; font-weight: 700; }

.subsectionTOCS, .sectionTOCS, .tableofcontents {
  margin: 1.6em 0;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface);
  font-family: "Trebuchet MS", Arial, sans-serif;
  font-size: 14px;
  line-height: 1.65;
}
.subsectionTOCS a, .sectionTOCS a { color: var(--ink-soft); }
.subsectionTOCS a:hover, .sectionTOCS a:hover { color: var(--blue-ink); }
.subsubsectionToc { margin-left: 1.2em; }
.cite { font-family: "Trebuchet MS", Arial, sans-serif; font-size: .88em; }

.on-this-page {
  position: fixed;
  z-index: 30;
  top: calc(var(--header-h) + 30px);
  right: 18px;
  width: var(--rail-w);
  max-height: calc(100vh - var(--header-h) - 55px);
  overflow-y: auto;
  padding: 0 12px 20px 18px;
  border-left: 1px solid var(--line);
  font-family: "Trebuchet MS", Arial, sans-serif;
}
.on-this-page h2 { margin: 0 0 9px; color: var(--faint); font-size: 10px; letter-spacing: .12em; text-transform: uppercase; }
.on-this-page a { display: block; margin: 4px 0; color: var(--muted); font-size: 12px; line-height: 1.4; }
.on-this-page a.depth-3 { padding-left: 12px; }
.on-this-page a.active { color: var(--blue-ink); font-weight: 700; }
.on-this-page:empty { display: none; }

.page-navigation { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 58px; padding-top: 24px; border-top: 1px solid var(--line); }
.page-nav-link { min-height: 88px; padding: 14px 16px; border: 1px solid var(--line); border-radius: 9px; background: var(--surface); }
.page-nav-link:hover { border-color: color-mix(in srgb, var(--blue) 32%, var(--line)); background: var(--blue-wash); text-decoration: none; }
.page-nav-link.next { text-align: right; }
.page-nav-direction { display: block; margin-bottom: 4px; color: var(--faint); font: 700 10px/1.4 "Trebuchet MS", Arial, sans-serif; letter-spacing: .08em; text-transform: uppercase; }
.page-nav-title { color: var(--ink); font: 700 14px/1.35 "Trebuchet MS", Arial, sans-serif; }

.search-dialog { width: min(720px, calc(100vw - 28px)); max-height: min(720px, calc(100vh - 28px)); padding: 0; border: 1px solid var(--line); border-radius: 13px; background: var(--surface); color: var(--ink-soft); box-shadow: 0 24px 90px rgba(0, 0, 0, .22); }
.search-dialog::backdrop { background: rgba(20, 18, 15, .42); backdrop-filter: blur(3px); }
.search-box { position: sticky; top: 0; display: flex; gap: 10px; padding: 14px; border-bottom: 1px solid var(--line); background: var(--surface); }
.search-box input { width: 100%; height: 44px; padding: 0 13px; border: 1px solid var(--line); border-radius: 8px; outline: none; background: var(--paper); color: var(--ink); font-family: "Trebuchet MS", Arial, sans-serif; }
.search-box input:focus { border-color: var(--blue); box-shadow: 0 0 0 3px color-mix(in srgb, var(--blue) 16%, transparent); }
.search-results { max-height: 560px; overflow-y: auto; padding: 8px; }
.search-empty { padding: 34px 20px; color: var(--muted); text-align: center; }
.search-result { display: block; padding: 12px 13px; border-radius: 8px; color: var(--ink-soft); }
.search-result:hover { background: var(--blue-wash); text-decoration: none; }
.search-result-title { color: var(--ink); font: 700 15px/1.4 "Trebuchet MS", Arial, sans-serif; }
.search-result-snippet { margin-top: 4px; color: var(--muted); font-size: 13px; line-height: 1.45; }
.search-result mark { padding: 0 1px; background: var(--sienna-wash); color: var(--sienna-ink); }

.landing { min-height: 100vh; padding-top: var(--header-h); }
.landing-hero { padding: clamp(72px, 11vw, 150px) 24px 72px; border-bottom: 1px solid var(--line); }
.landing-hero-inner { max-width: 1060px; margin: 0 auto; }
.landing-eyebrow { margin-bottom: 16px; color: var(--sienna-ink); font: 700 11px/1.4 "Trebuchet MS", Arial, sans-serif; letter-spacing: .12em; text-transform: uppercase; }
.landing h1 { max-width: 850px; margin: 0; color: var(--ink); font: 700 clamp(45px, 7vw, 82px)/1.04 "Trebuchet MS", Arial, sans-serif; letter-spacing: -.052em; }
.landing-subtitle { max-width: 680px; margin: 28px 0 0; color: var(--muted); font-size: clamp(18px, 2.2vw, 23px); line-height: 1.55; }
.landing-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 34px; }
.primary-action, .secondary-action { display: inline-flex; align-items: center; min-height: 46px; padding: 0 17px; border-radius: 8px; font: 700 14px/1 "Trebuchet MS", Arial, sans-serif; }
.primary-action { background: var(--blue-ink); color: white; }
.primary-action:hover { background: var(--blue); text-decoration: none; }
.secondary-action { border: 1px solid var(--line); background: var(--surface); color: var(--ink-soft); }
.secondary-action:hover { background: var(--line-soft); color: var(--ink); text-decoration: none; }
.landing-meta { display: flex; flex-wrap: wrap; gap: 22px; margin-top: 58px; color: var(--muted); font: 13px/1.5 "Trebuchet MS", Arial, sans-serif; }
.landing-meta strong { display: block; color: var(--ink); font-size: 20px; }
.landing-content { max-width: 1060px; margin: 0 auto; padding: 68px 24px 90px; }
.landing-section-title { margin: 0 0 30px; color: var(--ink); font: 700 28px/1.2 "Trebuchet MS", Arial, sans-serif; letter-spacing: -.025em; }
.part-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.part-card { padding: 21px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); }
.part-card-number { color: var(--sienna-ink); font: 700 10px/1.4 "Trebuchet MS", Arial, sans-serif; letter-spacing: .1em; text-transform: uppercase; }
.part-card h2 { margin: 8px 0 16px; color: var(--ink); font: 700 20px/1.25 "Trebuchet MS", Arial, sans-serif; }
.part-card ul { margin: 0; padding: 0; list-style: none; }
.part-card li { margin: 8px 0; }
.part-card a { color: var(--ink-soft); font: 14px/1.4 "Trebuchet MS", Arial, sans-serif; }
.part-card a:hover { color: var(--blue-ink); }
.landing-footer { padding: 28px 24px 40px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; text-align: center; }

@media (max-width: 1180px) {
  :root { --rail-w: 0px; }
  .reader-shell { padding-right: 38px; }
  .on-this-page { display: none; }
}
@media (max-width: 840px) {
  .site-header { grid-template-columns: auto minmax(0, 1fr) auto; }
  .brand { width: auto; border-right: 0; padding: 0 12px; }
  .brand-text { display: none; }
  .header-context { padding: 0 8px; }
  .menu-button { display: grid; }
  .header-actions { padding-right: 10px; }
  .header-actions .pdf-label { display: none; }
  .header-actions .text-button, .header-actions .theme-button { display: none; }
  .book-sidebar { transform: translateX(-102%); width: min(340px, 88vw); box-shadow: var(--shadow); transition: transform .22s ease; }
  body.sidebar-open .book-sidebar { transform: translateX(0); }
  .sidebar-scrim { position: fixed; z-index: 50; inset: var(--header-h) 0 0; display: none; background: rgba(20, 18, 15, .35); }
  body.sidebar-open .sidebar-scrim { display: block; }
  .reader-shell { padding: calc(var(--header-h) + 28px) 20px 60px; }
  .part-grid { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  body { font-size: 16px; line-height: 1.62; }
  .header-context { font-size: 12px; }
  .theme-button { display: none; }
  .document-page .sectionHead, .document-page .subsectionHead { font-size: 31px; }
  .theorem-card { margin-left: -7px; margin-right: -7px; padding: 15px 15px 14px; }
  .page-navigation { grid-template-columns: 1fr; }
  .page-nav-link.next { text-align: left; }
  .landing-hero { padding-top: 66px; overflow: hidden; }
  .landing h1 { font-size: 42px; overflow-wrap: anywhere; }
  .landing-actions { flex-direction: column; align-items: stretch; }
  .landing-actions > * { width: 100%; justify-content: center; }
  .landing-meta { display: grid; grid-template-columns: 1fr 1fr; }
}
@media print {
  .site-header, .book-sidebar, .on-this-page, .page-navigation, .reading-progress, .sidebar-scrim { display: none !important; }
  .reader-shell { padding: 0; }
  body { background: white; color: black; }
  .theorem-card { break-inside: avoid; box-shadow: none; }
}
.theorem-card > .tcolorbox-content { display: contents; }
.web-sans, .web-semibold { font-family: "Trebuchet MS", Arial, sans-serif; }
.web-semibold { color: var(--ink); font-weight: 700; }
.web-bold { color: var(--ink); font-weight: 700; }
.web-italic { font-style: italic; }
@media (max-width: 560px) {
  .site-header { grid-template-columns: 50px minmax(0, 1fr) 88px; width: 100vw; }
  .header-context { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .header-actions { min-width: 0; padding-right: 8px; }
  .landing, .landing-hero, .landing-hero-inner, .landing-content { width: 100%; max-width: 100%; min-width: 0; }
  .landing h1, .landing-subtitle { max-width: 100%; word-break: normal; overflow-wrap: anywhere; }
}

/* Stronger section-number hierarchy */
.document-page .subsectionHead .titlemark {
  margin-bottom: 10px;
  font-size: .56em;
  font-weight: 700;
  letter-spacing: .055em;
}
.document-page .subsubsectionHead .titlemark {
  margin-bottom: 8px;
  font-size: .68em;
  font-weight: 700;
  letter-spacing: .045em;
}
.book-nav .nav-number {
  font-size: 1.04em;
  font-weight: 600;
}

/* Landing page: match the compact academic rhythm of alexhuang13.github.io */
body:has(.landing) {
  font-family: "Trebuchet MS", "KaiTi", "楷体", "STKaiti", "华文楷体", Arial, sans-serif;
  font-size: 20px;
  line-height: 1.5;
}
body:has(.landing) .site-header {
  grid-template-columns: 260px minmax(0, 1fr) auto;
}
body:has(.landing) .brand {
  padding-left: clamp(24px, 4.45vw, 64px);
  font-size: 18px;
}
body:has(.landing) .header-context {
  padding-left: 28px;
  font-size: 17px;
}
body:has(.landing) .header-actions {
  padding-right: clamp(24px, 4.45vw, 64px);
}
.landing {
  padding-top: var(--header-h);
}
.landing-hero {
  padding: 34px clamp(24px, 4.45vw, 64px) 24px;
  border-bottom: 0;
}
.landing-hero-inner {
  max-width: 1432px;
  margin: 0 auto;
  padding: 20px;
}
.landing-eyebrow {
  margin: 0 0 7px;
  color: var(--sienna-ink);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: .035em;
  text-transform: none;
}
.landing h1 {
  max-width: none;
  margin: 0;
  color: var(--ink);
  font-family: "Trebuchet MS", "KaiTi", "楷体", Arial, sans-serif;
  font-size: clamp(38px, 3.5vw, 50px);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -.025em;
}
.landing-subtitle {
  max-width: 970px;
  margin: 12px 0 0;
  color: var(--ink-soft);
  font-family: "Trebuchet MS", "KaiTi", "楷体", Arial, sans-serif;
  font-size: 20px;
  line-height: 1.6;
}
.landing-actions {
  gap: 10px;
  margin-top: 20px;
}
.primary-action,
.secondary-action {
  min-height: 41px;
  padding: 0 14px;
  border-radius: 8px;
  font-family: "Trebuchet MS", Arial, sans-serif;
  font-size: 16px;
  font-weight: 600;
  line-height: 1;
}
.landing-meta {
  gap: 12px;
  margin-top: 20px;
  color: var(--muted);
  font-family: "Trebuchet MS", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.5;
}
.landing-meta span {
  min-width: 118px;
  padding: 10px 12px;
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  background: var(--surface);
}
.landing-meta strong {
  display: inline;
  margin-right: 5px;
  color: var(--ink);
  font-size: 19px;
  line-height: inherit;
}
.landing-content {
  max-width: 1432px;
  margin: 0 auto;
  padding: 4px clamp(24px, 4.45vw, 64px) 64px;
}
.landing-content::before {
  display: block;
  height: 1px;
  margin: 0 20px 18px;
  background: var(--line);
  content: "";
}
.landing-section-title {
  margin: 0 20px 10px;
  color: var(--ink);
  font-family: "Trebuchet MS", "KaiTi", "楷体", Arial, sans-serif;
  font-size: 27px;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -.015em;
}
.part-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  padding: 0 20px;
}
.part-card {
  padding: 14px 16px;
  border-radius: 10px;
  box-shadow: 0 1px 2px rgba(32, 29, 24, .035);
}
.part-card-number {
  color: var(--sienna-ink);
  font-family: "Trebuchet MS", Arial, sans-serif;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 0;
  text-transform: none;
}
.part-card h2 {
  margin: 3px 0 8px;
  color: var(--ink);
  font-family: "Trebuchet MS", "KaiTi", "楷体", Arial, sans-serif;
  font-size: 22px;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -.01em;
}
.part-card li {
  margin: 4px 0;
}
.part-card a {
  color: var(--ink-soft);
  font-family: "Trebuchet MS", "KaiTi", "楷体", Arial, sans-serif;
  font-size: 18px;
  line-height: 1.5;
}
.landing-footer {
  max-width: 1432px;
  margin: 0 auto;
  padding: 28px 64px 38px;
  color: var(--muted);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 18px;
  font-style: italic;
  line-height: 1.7;
}

@media (max-width: 840px) {
  body:has(.landing) .site-header { grid-template-columns: 50px minmax(0, 1fr) 88px; }
  body:has(.landing) .brand { padding-left: 12px; }
  body:has(.landing) .header-context { padding-left: 8px; font-size: 14px; }
  body:has(.landing) .header-actions { padding-right: 8px; }
  .landing-hero { padding: 24px 4px 18px; }
  .landing-hero-inner { padding: 20px; }
  .landing h1 { font-size: 38px; line-height: 1.16; }
  .landing-subtitle { font-size: 19px; line-height: 1.55; }
  .landing-content { padding: 0 4px 48px; }
  .part-grid { grid-template-columns: 1fr; }
  .landing-footer { padding: 26px 24px 34px; font-size: 17px; }
}

@media (max-width: 560px) {
  body:has(.landing) { font-size: 18px; }
  .landing h1 { font-size: 35px; overflow-wrap: normal; }
  .landing-eyebrow { font-size: 14px; }
  .landing-subtitle { font-size: 18px; line-height: 1.55; }
  .landing-actions { margin-top: 18px; }
  .landing-meta { grid-template-columns: 1fr 1fr; gap: 8px; }
  .landing-meta span { min-width: 0; padding: 9px 10px; }
  .landing-meta strong { display: block; margin-right: 0; font-size: 19px; }
  .landing-section-title { font-size: 25px; }
  .part-card h2 { font-size: 21px; }
  .part-card a { font-size: 17px; }
}


/* Minimal cover requested: title and primary actions only */
.landing h1 {
  font-size: clamp(32px, 2.8vw, 41px);
  line-height: 1.18;
}
.landing-actions {
  margin-top: 17px;
}
.landing-hero {
  padding-bottom: 18px;
}
@media (max-width: 840px) {
  .landing h1 { font-size: 33px; }
}
@media (max-width: 560px) {
  .landing h1 { font-size: 30px; line-height: 1.2; }
}

/* Figure 2: keep all three CART panels on one horizontal row */
.document-page figure:has(> .subfigure) {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}
.document-page figure:has(> .subfigure) > .subfigure {
  flex: 1 1 0;
  min-width: 0;
  margin: 0;
}
.document-page figure:has(> .subfigure) > .subfigure p {
  margin: 0;
}
.document-page figure:has(> .subfigure) > .subfigure img {
  display: block;
  width: 100% !important;
  height: auto !important;
}
.document-page figure:has(> .subfigure) > .caption {
  flex: 0 0 100%;
  width: 100%;
}

/* Algorithms: simple left-aligned print-style treatment */
.document-page .algorithm {
  width: 100%;
  margin: 1.55em 0 1.75em;
}
.document-page .algorithm > figure.float {
  width: 100%;
  max-width: none;
  margin: 0;
  border-top: 1px solid var(--ink-soft);
  border-bottom: 1px solid var(--ink-soft);
  text-align: left;
}
.document-page .algorithm > figure.float > .caption {
  margin: 0;
  padding: .32em 0 .36em;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  font-size: 14px;
  line-height: 1.35;
  text-align: left;
}
.document-page .algorithm > figure.float > .caption .id {
  color: var(--blue-ink);
}
.document-page .algorithm > figure.float > .algorithmic {
  padding: .45em 0 .58em;
  overflow-x: auto;
  color: var(--ink);
  font-size: 15px;
  line-height: 1.5;
  text-align: left;
  scrollbar-width: thin;
}
.document-page .algorithm > figure.float > .algorithmic > .line {
  display: block;
  min-width: max-content;
  text-align: left;
}
.document-page .algorithm > figure.float > .algorithmic > .line > .label {
  display: none;
}
.document-page .algorithm > figure.float > .algorithmic > .line > .algorithmic {
  display: inline;
  text-align: left;
  white-space: nowrap;
}
.document-page .algorithm > figure.float > .algorithmic br.algorithmic {
  display: block;
}
.document-page .algorithm .mathjax-inline {
  text-align: left;
}

@media (max-width: 700px) {
  .document-page .algorithm > figure.float > .algorithmic {
    font-size: 14px;
  }
}