:root {
  color-scheme: light;
  --reader-paper: #f7f7f8;
  --reader-white: #ffffff;
  --reader-ink: #171717;
  --reader-muted: #666762;
  --reader-line: #d9d9d4;
  --reader-red: #e4002b;
  --reader-link: #b00020;
  --reader-link-hover: #8f001b;
  --reader-code: #eeeeeb;
  --reader-highlight-lime: #c5f83a;
  --reader-highlight-yellow: #ffe28a;
  --reader-highlight-pink: #f7b4d7;
  --reader-highlight-cyan: #9be8ee;
  --reader-highlight-orange: #ffc078;
  font-family: Arial, Helvetica, sans-serif;
}

* { box-sizing: border-box; }

:focus-visible { outline: 3px solid var(--reader-red); outline-offset: 4px; }

.reader-skip-link {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 1rem;
  padding: .7rem 1rem;
  color: #fff;
  background: var(--reader-red);
  transform: translateY(-130%);
  transition: transform .2s ease;
}

.reader-skip-link:focus { transform: translateY(1rem); }

body {
  margin: 0;
  background: var(--reader-paper);
  color: var(--reader-ink);
  line-height: 1.65;
}

a { color: var(--reader-link); }
a:hover { color: var(--reader-link-hover); }

.reader-skip-link:focus-visible { outline-color: var(--reader-ink); }

.reader-header { position: sticky; z-index: 5; top: 0; border-bottom: 1px solid var(--reader-ink); background: rgba(255, 255, 255, .97); backdrop-filter: blur(10px); }

.reader-header-inner,
.reader-footer-inner,
.reader-shell {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
}

.reader-header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.reader-brand { display: inline-flex; align-items: center; gap: .7rem; color: var(--reader-ink); text-decoration: none; }
.reader-brand-logo { display: block; width: 34px; height: 34px; object-fit: contain; }
.reader-brand > span { display: grid; gap: .15rem; }
.reader-brand small { color: var(--reader-red); font-size: .58rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.reader-brand strong { font-size: .9rem; letter-spacing: -.02em; }

.reader-header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: .82rem;
}

.reader-back { font-weight: 700; }
.reader-language-label { color: var(--reader-muted); }

#reader-language {
  min-height: 36px;
  padding: 0 28px 0 10px;
  border: 1px solid var(--reader-ink);
  border-radius: 0;
  background: #fff;
  color: var(--reader-ink);
  font: inherit;
}

.reader-banner {
  padding: 12px 20px;
  border-bottom: 1px solid #e7b3bc;
  background: #fff0f2;
  color: #7d0d22;
  text-align: center;
  font-size: .9rem;
}
.reader-retry, .reader-error-action { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 18px; border: 1px solid var(--reader-ink); font: 800 .76rem/1 Arial, Helvetica, sans-serif; letter-spacing: .04em; text-decoration: none; text-transform: uppercase; cursor: pointer; }
.reader-retry { color: #fff; background: var(--reader-ink); }
.reader-error-action { color: var(--reader-ink); background: #fff; }
.reader-retry:hover, .reader-retry:focus-visible { border-color: var(--reader-red); background: var(--reader-red); }
.reader-error-action:hover, .reader-error-action:focus-visible { border-color: var(--reader-red); color: var(--reader-red); }

.reader-main { padding: clamp(42px, 7vw, 82px) 0 96px; }

.reader-shell {
  display: grid;
  grid-template-columns: minmax(0, 780px) 220px;
  gap: 70px;
  align-items: start;
}

.reader-article {
  min-width: 0;
  padding: clamp(2rem, 5vw, 4.25rem) clamp(1.25rem, 5vw, 4.5rem) 3rem;
  border: 1px solid var(--reader-line);
  border-top: 6px solid var(--reader-red);
  background: var(--reader-white);
}

.reader-mobile-orientation { display: none; }
.reader-mobile-page-toc { display: none; }
.reader-mobile-orientation[hidden], .reader-mobile-page-toc[hidden] { display: none; }
.reader-aside[hidden] { display: none; }
.reader-mobile-orientation summary { cursor: pointer; font-size: .875rem; }
.reader-mobile-progress { display: block; margin-top: 14px; color: var(--reader-ink); font-size: .875rem; letter-spacing: normal; text-transform: none; }
.reader-mobile-chapter-links { display: grid; gap: 8px; margin-top: 12px; }
.reader-mobile-chapter-links a { padding: 10px 0; border-top: 1px solid var(--reader-line); color: var(--reader-ink); font-size: .875rem; line-height: 1.4; text-decoration: none; }
.reader-article-context { margin: -1.15rem 0 2rem; color: var(--reader-red); font-size: .72rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; }

.reader-article > h1 {
  margin: 0 0 24px;
  font-size: clamp(2.35rem, 5vw, 4rem);
  line-height: .98;
  letter-spacing: -.055em;
  max-width: 760px;
}

.reader-article > h1::after {
  content: "";
  display: block;
  width: 72px;
  height: 7px;
  margin-top: 24px;
  background: var(--reader-red);
}

.reader-article h2 {
  margin: 64px 0 16px;
  padding-top: 17px;
  border-top: 1px solid var(--reader-ink);
  font-size: 1.65rem;
  line-height: 1.12;
  letter-spacing: -.025em;
  scroll-margin-top: 100px;
}

.reader-article h3 { margin: 36px 0 10px; font-size: 1.2rem; scroll-margin-top: 100px; }
.reader-article h4, .reader-article h5, .reader-article h6 { margin: 26px 0 8px; }
.reader-anchor { display: block; height: 0; scroll-margin-top: 190px; }
.reader-article p { max-width: 70ch; margin: 0 0 20px; }
.reader-article a { overflow-wrap: anywhere; }
.reader-article p a,
.reader-article li a,
.reader-article blockquote a { text-decoration: underline; text-decoration-thickness: .08em; text-underline-offset: .18em; }
.reader-article p a:hover,
.reader-article p a:focus-visible,
.reader-article li a:hover,
.reader-article li a:focus-visible,
.reader-article blockquote a:hover,
.reader-article blockquote a:focus-visible { text-decoration-thickness: .14em; }
.reader-article > p:first-of-type { color: #3f403d; font-size: 1.08rem; line-height: 1.75; }

.reader-article ul,
.reader-article ol { margin: 0 0 22px; padding-left: 26px; }
.reader-article li + li { margin-top: 6px; }

.reader-article blockquote {
  margin: 28px 0;
  padding: 16px 22px;
  border-left: 5px solid var(--reader-red);
  background: #fff;
  color: #41423e;
}

.reader-prompt-block { position: relative; margin: 24px 0; padding-top: 42px; border: 1px solid var(--reader-ink); background: #161616; }
.reader-prompt-block pre { margin: 0; border: 0; }
.reader-copy-prompt { position: absolute; top: 0; right: 0; min-height: 44px; border: 0; border-left: 1px solid #565656; padding: 0 16px; color: #fff; background: var(--reader-red); font: 700 .72rem/1 Arial, Helvetica, sans-serif; letter-spacing: .04em; text-transform: uppercase; cursor: pointer; }
.reader-copy-prompt:hover, .reader-copy-prompt:focus-visible { color: var(--reader-ink); background: #fff; }
.reader-copy-status { position: absolute; top: 13px; left: 14px; color: #b9b9b3; font: .68rem/1 Consolas, 'Courier New', monospace; }

.reader-article mark { position: relative; z-index: 0; display: inline; padding: .05em .13em .08em; color: var(--reader-ink); background: transparent; -webkit-box-decoration-break: clone; box-decoration-break: clone; }
.reader-article a mark { color: var(--reader-ink); text-decoration: underline; text-decoration-thickness: .08em; text-underline-offset: .16em; }
.reader-article mark::before { position: absolute; z-index: -1; top: .17em; right: -.08em; bottom: .08em; left: -.08em; content: ''; background: var(--reader-highlight-lime); transform: skewX(-5deg) rotate(-.6deg); }
.reader-article mark.highlight-yellow::before { background: var(--reader-highlight-yellow); }
.reader-article mark.highlight-pink::before { background: var(--reader-highlight-pink); }
.reader-article mark.highlight-cyan::before { background: var(--reader-highlight-cyan); }
.reader-article mark.highlight-orange::before { background: var(--reader-highlight-orange); }

.reader-article pre {
  overflow-x: auto;
  margin: 24px 0;
  padding: 18px 20px;
  border: 1px solid var(--reader-ink);
  background: var(--reader-code);
  font: .84rem/1.6 Consolas, "Courier New", monospace;
}

.reader-article code {
  overflow-wrap: anywhere;
  padding: 2px 5px;
  background: var(--reader-code);
  font: .88em Consolas, "Courier New", monospace;
}

.reader-article pre code { padding: 0; background: transparent; }
.reader-article hr { margin: 40px 0; border: 0; border-top: 1px solid var(--reader-ink); }

.reader-article p:has(.reader-image-link) { margin: 30px 0; }
.reader-image-link { display: grid; gap: .55rem; color: inherit; }
.reader-article .reader-image-link img,
.reader-article > img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0;
  border: 1px solid var(--reader-line);
  background: #fff;
}
.reader-image-link-label { color: var(--reader-link); font-size: .78rem; font-weight: 700; }
.reader-image-link:hover img,
.reader-image-link:focus-visible img { border-color: var(--reader-red); }
.reader-teaching-visual {
  width: calc(100% + 3.5rem);
  margin: 36px -1.75rem;
  padding: 18px;
  border-top: 4px solid var(--reader-red);
  background: #f1f1ed;
  text-decoration: none;
}
.reader-visual-thesis {
  color: var(--reader-ink);
  font-size: .9rem;
  font-weight: 800;
  line-height: 1.35;
}
.reader-teaching-visual .reader-image-link-label { margin-top: 2px; }

.reader-table-wrap {
  max-width: 100%;
  margin: 24px 0;
  overflow-x: auto;
  overscroll-behavior-x: contain;
}

.reader-table-hint { display: none; }
.reader-table-wrap:focus-visible { outline: 3px solid var(--reader-red); outline-offset: 3px; }

.reader-article table {
  width: 100%;
  margin: 0;
  border-collapse: collapse;
  font-size: .92rem;
}

.reader-article th,
.reader-article td {
  padding: 10px 12px;
  border: 1px solid var(--reader-line);
  text-align: left;
  vertical-align: top;
}

.reader-article th { background: #e9e9e5; font-weight: 800; }

.reader-article .book-navigation,
.reader-article .chapter-navigation,
.reader-article nav[aria-label="Chapter navigation"],
.reader-article nav[aria-label="章节导航"] {
  margin-top: 64px;
  padding-top: 20px;
  border-top: 2px solid var(--reader-ink);
}

.reader-article .book-navigation table,
.reader-article .chapter-navigation table,
.reader-article nav[aria-label="Chapter navigation"] table,
.reader-article nav[aria-label="章节导航"] table { margin: 0; }
.reader-article .book-navigation td,
.reader-article .chapter-navigation td,
.reader-article nav[aria-label="Chapter navigation"] td,
.reader-article nav[aria-label="章节导航"] td { width: 50%; border: 0; padding: 0 8px 0 0; }
.reader-article .book-navigation td:last-child,
.reader-article .chapter-navigation td:last-child,
.reader-article nav[aria-label="Chapter navigation"] td:last-child,
.reader-article nav[aria-label="章节导航"] td:last-child { padding: 0 0 0 8px; text-align: right; }
.reader-article .book-navigation a,
.reader-article .chapter-navigation a,
.reader-article nav[aria-label="Chapter navigation"] a,
.reader-article nav[aria-label="章节导航"] a { display: inline-block; max-width: 100%; padding: 10px 12px; border: 1px solid var(--reader-line); color: var(--reader-ink); background: #fafaf8; text-decoration: none; }
.reader-article .book-navigation a:hover, .reader-article .book-navigation a:focus-visible,
.reader-article .chapter-navigation a:hover, .reader-article .chapter-navigation a:focus-visible,
.reader-article nav[aria-label="Chapter navigation"] a:hover, .reader-article nav[aria-label="Chapter navigation"] a:focus-visible,
.reader-article nav[aria-label="章节导航"] a:hover, .reader-article nav[aria-label="章节导航"] a:focus-visible { border-color: var(--reader-red); color: var(--reader-red); background: #fff0f2; }
.reader-article .book-navigation strong,
.reader-article .chapter-navigation strong,
.reader-article nav[aria-label="Chapter navigation"] strong,
.reader-article nav[aria-label="章节导航"] strong { color: inherit; font-size: .9rem; }

.reader-aside { position: sticky; top: 100px; max-height: calc(100vh - 120px); overflow-y: auto; scrollbar-gutter: stable; padding-bottom: 24px; }
.reader-aside a:focus-visible, .reader-aside summary:focus-visible { outline-offset: 2px; }
.reader-aside-card { padding: 14px 0; border-top: 1px solid var(--reader-ink); }
.reader-aside-label { display: block; margin-bottom: 5px; color: var(--reader-muted); font-size: .72rem; letter-spacing: .08em; text-transform: uppercase; }
.reader-aside code { display: block; overflow-wrap: anywhere; background: transparent; padding: 0; font-size: .76rem; }
.reader-toc-card { padding-bottom: 18px; }
.reader-toc-list, .reader-toc ol { margin: 0; padding: 0; list-style: none; }
.reader-toc li + li { margin-top: 7px; }
.reader-toc a { display: block; color: var(--reader-muted); font-size: .78rem; line-height: 1.35; text-decoration: none; }
.reader-toc a:hover, .reader-toc a:focus-visible { color: var(--reader-link-hover); }
.reader-toc a.is-current { padding-left: 8px; border-left: 3px solid var(--reader-red); color: var(--reader-link-hover); font-weight: 800; }
.reader-toc a[data-level="3"] { padding-left: 10px; font-size: .73rem; }
.reader-chapter-card strong { display: block; font-size: .9rem; line-height: 1.25; }
.reader-chapter-status { display: block; margin-top: 6px; color: var(--reader-muted); font-size: .72rem; line-height: 1.4; }
.reader-source-link { display: block; margin-top: 22px; font-size: .86rem; font-weight: 700; }
.reader-loading { color: var(--reader-muted); }
.reader-error { padding: 22px; border-left: 5px solid var(--reader-red); background: #fff0f2; }
.reader-error p { margin: 0; }
.reader-error-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }

.reader-book-nav-card { padding-bottom: 18px; }
.reader-book-progress { margin-bottom: 14px; color: var(--reader-ink); font-size: .78rem; font-weight: 700; line-height: 1.45; }
.reader-chapter-list-disclosure summary,
.reader-details summary { cursor: pointer; color: var(--reader-muted); font-size: .76rem; font-weight: 700; }
.reader-chapter-list-disclosure summary:hover,
.reader-chapter-list-disclosure summary:focus-visible,
.reader-details summary:hover,
.reader-details summary:focus-visible { color: var(--reader-red); }
.reader-chapter-list-disclosure ol { display: grid; gap: 6px; margin: 12px 0 0; padding: 0; list-style: none; }
.reader-chapter-list-disclosure a { display: block; color: var(--reader-muted); font-size: .74rem; line-height: 1.35; text-decoration: none; }
.reader-chapter-list-disclosure a:hover,
.reader-chapter-list-disclosure a:focus-visible,
.reader-chapter-list-disclosure a.is-current { color: var(--reader-link-hover); }
.reader-chapter-list-disclosure a.is-current { font-weight: 800; }
.reader-details { margin-top: 18px; }
.reader-details[open] { padding-bottom: 18px; }
.reader-trust-card { margin-top: 18px; }
.reader-trust-card[open] { padding-bottom: 18px; }
.reader-trust-card [data-reader-trust-scope] { color: var(--reader-ink); font-size: .8rem; font-weight: 700; }
.reader-trust-card [data-reader-trust-limitations] { display: block; color: var(--reader-muted); font-size: .78rem; line-height: 1.45; }
.reader-trust-boundary { margin: 16px 0 0; color: var(--reader-muted); font-size: .72rem; line-height: 1.45; }
.reader-detail-row { margin-top: 14px; }
.reader-detail-row .reader-aside-label { margin-bottom: 4px; }

.reader-pagination { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-top: 22px; }
.reader-pagination-link { display: grid; gap: 8px; min-width: 0; max-width: 100%; min-height: 92px; padding: 16px 18px; border: 1px solid var(--reader-line); border-top: 4px solid var(--reader-ink); color: var(--reader-ink); background: var(--reader-white); text-decoration: none; }
.reader-pagination-link:hover, .reader-pagination-link:focus-visible { border-top-color: var(--reader-red); color: var(--reader-link-hover); background: #fffafb; }
.reader-pagination-link[hidden] { display: none; }
.reader-pagination-next { text-align: right; }
.reader-pagination-kicker { color: var(--reader-red); font-size: .68rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.reader-pagination-link strong { color: inherit; font-size: .92rem; line-height: 1.35; overflow-wrap: anywhere; }

.reader-footer { border-top: 1px solid var(--reader-ink); color: #fff; background: var(--reader-ink); }
.reader-footer-inner { display: flex; justify-content: space-between; gap: 18px; padding: 18px 0; color: #b5b5b0; font-size: .76rem; }
.reader-footer-brand { display: inline-flex; align-items: center; gap: .55rem; color: #fff; }
.reader-brand-logo-light { width: 30px; height: 30px; }

@media (forced-colors: active) {
  .reader-article mark { text-decoration: underline 3px; text-decoration-color: Highlight; text-decoration-skip-ink: none; }
  .reader-article mark::before { display: none; }
}

@media (max-width: 820px) {
  .reader-header { position: static; }
  .reader-header-inner { align-items: flex-start; flex-direction: column; padding: 17px 0; }
  .reader-header-actions { width: 100%; flex-wrap: wrap; }
  .reader-shell { grid-template-columns: 1fr; gap: 24px; }
  .reader-mobile-orientation { display: block; margin: 0 0 12px; padding: 12px 0; border-top: 1px solid var(--reader-line); border-bottom: 1px solid var(--reader-line); color: var(--reader-red); font-weight: 800; letter-spacing: .06em; text-transform: uppercase; background: var(--reader-white); }
  .reader-mobile-page-toc { display: block; margin: 0 0 24px; padding: 12px 0; border-bottom: 1px solid var(--reader-line); color: var(--reader-ink); background: var(--reader-white); }
  .reader-mobile-page-toc summary { color: var(--reader-red); cursor: pointer; font-size: .875rem; font-weight: 800; }
  .reader-mobile-page-toc ol { margin: 12px 0 0; padding-left: 20px; }
  .reader-mobile-page-toc li + li { margin-top: 7px; }
  .reader-mobile-page-toc a { color: var(--reader-muted); font-size: .875rem; line-height: 1.45; text-decoration: none; }
  .reader-article h2, .reader-article h3 { scroll-margin-top: 24px; }
  .reader-article { padding: 2.1rem 1.5rem 2.5rem; }
  .reader-aside { position: static; display: block; max-height: none; overflow: visible; padding-bottom: 0; }
  .reader-book-nav, .reader-toc, .reader-chapter-card, .reader-details { grid-column: 1; }
  .reader-book-nav { order: -1; }
  .reader-pagination { grid-template-columns: 1fr; }
  .reader-pagination-next { text-align: left; }
  .reader-main { padding-top: 24px; }
  .reader-footer-inner { flex-direction: column; }
  .reader-error-actions > * { flex: 1 1 12rem; }
  .reader-teaching-visual {
    width: auto;
    margin: 30px 0;
    padding: 16px;
    border: 1px solid var(--reader-line);
    border-top: 4px solid var(--reader-red);
    background: #f1f1ed;
  }
  .reader-article .reader-teaching-visual img { display: none; }
  .reader-teaching-visual .reader-image-link-label {
    display: inline-flex;
    align-items: center;
    min-height: 36px;
    margin-top: 2px;
    color: var(--reader-ink);
    font-size: .75rem;
    letter-spacing: .04em;
    text-transform: uppercase;
  }
  .reader-teaching-visual .reader-image-link-label::after {
    margin-left: .5rem;
    color: var(--reader-red);
    content: '↗';
    font-size: 1rem;
  }
}

@media (max-width: 520px) {
  .reader-header-inner, .reader-footer-inner, .reader-shell { width: min(100% - 28px, 1160px); }
  .reader-article > h1 { overflow-wrap: anywhere; font-size: 2.15rem; }
  .reader-aside-card + .reader-aside-card { border-top: 0; }
  .reader-prompt-block pre { white-space: pre-wrap; overflow-wrap: anywhere; }
  .reader-table-wrap.reader-table-wide { padding: 12px; border: 1px solid var(--reader-line); background: #fafaf8; }
  .reader-table-wide .reader-table-hint { display: block; margin: 0 0 10px; color: var(--reader-red); font-size: .78rem; font-weight: 800; line-height: 1.35; }
  .reader-table-wide table { min-width: 36rem; }
}