@charset "UTF-8";

:root {
  color-scheme: light;
  --paper: #f7f5ef;
  --paper-deep: #efede5;
  --ink: #282923;
  --ink-soft: #686960;
  --line: #dedbd1;
  --brass: #957b4b;
  --brass-light: #c1ad83;
  --white: #fffefa;
  --serif: "Iowan Old Style", "Baskerville", "Palatino Linotype", "Songti SC", "Noto Serif CJK SC", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; background: var(--paper); }
button, input { font: inherit; }
button { color: inherit; }
button:focus-visible, a:focus-visible, input:focus-visible, label:focus-within { outline: 2px solid var(--brass); outline-offset: 4px; }
a { color: inherit; text-decoration: none; }
[hidden] { display: none !important; }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

.site-header {
  height: 88px;
  padding: 0 clamp(24px, 6.3vw, 104px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}
.wordmark { display: inline-flex; align-items: center; gap: 12px; }
.wordmark-seal {
  width: 39px; height: 39px; display: grid; place-items: center;
  border: 1px solid var(--brass); color: var(--brass); font: 22px var(--serif);
}
.wordmark-copy { display: grid; gap: 2px; }
.wordmark-copy strong { font: 22px/1 var(--serif); letter-spacing: .08em; }
.wordmark-copy small { color: var(--ink-soft); font-size: 8px; letter-spacing: .19em; }
.top-nav { display: flex; align-items: center; gap: 34px; }
.top-link, .footer-link { padding: 6px 0; border: 0; background: none; color: var(--ink-soft); font-size: 13px; cursor: pointer; }
.top-link.is-active { color: var(--ink); }
.top-link.is-active::after { content: ""; display: block; width: 16px; height: 1px; margin: 6px auto 0; background: var(--brass); }
.top-link:hover, .footer-link:hover { color: var(--brass); }

.home-view { max-width: 1216px; margin: 0 auto; padding: 94px 38px 0; }
.home-heading { padding: 0 0 79px; text-align: center; }
.eyebrow, .section-kicker { color: var(--brass); font-size: 10px; letter-spacing: .2em; }
.eyebrow { display: flex; justify-content: center; align-items: center; gap: 10px; }
.eyebrow-line { width: 22px; height: 1px; background: var(--brass-light); }
h1, h2, h3, p { margin-top: 0; }
.home-heading h1 { margin: 24px 0 13px; font: 400 clamp(38px, 5vw, 59px)/1.25 var(--serif); letter-spacing: .035em; }
h1 em, h2 em, .cover-title em { color: var(--brass); font-style: normal; }
.home-intro { margin: 0; color: var(--ink-soft); font-size: 14px; letter-spacing: .025em; }
.shelf-section { border-top: 1px solid var(--line); }
.section-heading { display: flex; justify-content: space-between; align-items: end; padding: 24px 0 29px; }
.section-kicker { margin: 0 0 8px; font-size: 9px; letter-spacing: .19em; }
.section-heading h2, .toc-heading h2, .reader-sidebar h2 { margin: 0; font: 400 28px/1.2 var(--serif); letter-spacing: .03em; }
.search-box { display: flex; align-items: center; gap: 10px; width: 220px; padding: 9px 0; border-bottom: 1px solid var(--line); color: var(--ink-soft); }
.search-box svg { width: 17px; height: 17px; fill: none; stroke: currentColor; stroke-width: 1.5; }
.search-box input { width: 100%; border: 0; outline: 0; background: transparent; color: var(--ink); font-size: 12px; }
.search-box input::placeholder { color: #96958c; }
.book-grid { display: grid; grid-template-columns: minmax(0, 1fr); }
.book-card { display: grid; grid-template-columns: minmax(245px, 34%) minmax(0, 1fr); gap: clamp(28px, 5vw, 72px); padding: 0 0 55px; border-bottom: 1px solid var(--line); }
.cover-button { display: block; width: 100%; max-width: 340px; padding: 0; border: 0; background: none; text-align: left; cursor: pointer; }
.book-cover {
  position: relative; display: flex; flex-direction: column; overflow: hidden; aspect-ratio: .77;
  padding: 25px 26px 21px; background: #eeece3; color: var(--ink);
  border: 1px solid #e2ded2; box-shadow: 0 8px 24px #2829230d;
}
.cover-meta, .cover-bottom { display: flex; justify-content: space-between; color: #77766c; font-size: 8px; letter-spacing: .12em; }
.cover-rule { width: 33px; height: 1px; margin: 23px 0 16px; background: var(--brass); }
.cover-title { z-index: 1; font: 400 clamp(31px, 3.6vw, 43px)/1.28 var(--serif); letter-spacing: .05em; }
.cover-title span { display: block; }
.cover-title em { font-size: .91em; }
.cover-cat { position: absolute; width: 43%; right: 9%; bottom: 22%; fill: none; stroke: var(--brass); stroke-width: 1.1; opacity: .72; transform: rotate(-5deg); }
.cover-caption { position: absolute; bottom: 14%; right: 9%; color: var(--brass); font: 11px var(--serif); letter-spacing: .12em; }
.cover-bottom { margin-top: auto; font-size: 7px; letter-spacing: .16em; }
.book-details { display: flex; flex-direction: column; justify-content: center; padding: 14px 0; }
.book-label-row { display: flex; align-items: center; gap: 11px; }
.topic-label { padding: 6px 10px; color: #746344; background: #ece7da; font-size: 10px; letter-spacing: .06em; }
.edition-label { color: #8b897f; font-size: 10px; }
.book-details h3 { margin: 24px 0 10px; font: 400 clamp(25px, 3.1vw, 35px)/1.3 var(--serif); }
.book-details h3 button { padding: 0; border: 0; background: none; font: inherit; cursor: pointer; }
.book-details h3 button:hover { color: var(--brass); }
.book-summary { max-width: 430px; margin: 0; color: var(--ink-soft); font: 15px/1.9 var(--serif); }
.book-card-footer { display: flex; justify-content: space-between; align-items: center; gap: 15px; margin-top: 38px; padding-top: 15px; border-top: 1px solid var(--line); color: #88877e; font-size: 10px; }
.book-card-actions { display: flex; align-items: center; gap: 19px; }
.text-link { padding: 7px 0; border: 0; background: none; color: var(--ink); font-size: 11px; cursor: pointer; white-space: nowrap; }
.text-link span { color: var(--brass); padding-left: 4px; }
.empty-search { padding: 30px 0; color: var(--ink-soft); font: 15px var(--serif); }
.site-footer { display: flex; justify-content: space-between; align-items: center; padding: 26px 0 32px; color: #85847b; font-size: 10px; }
.footer-dot { margin: 0 7px; color: var(--brass); }
.footer-link { font-size: 10px; }

.page-shell { max-width: 1090px; margin: 0 auto; padding: 35px 36px 75px; }
.back-link { display: inline-flex; align-items: center; gap: 10px; padding: 6px 0; border: 0; background: none; color: var(--ink-soft); font-size: 12px; cursor: pointer; }
.back-link:hover { color: var(--brass); }
.book-intro-grid { display: grid; grid-template-columns: minmax(220px, 32%) 1fr; gap: clamp(45px, 8vw, 110px); align-items: center; padding: 37px 0 71px; }
.intro-cover { width: 100%; max-width: 310px; margin: 0 auto; aspect-ratio: .77; padding: 23px 24px 20px; }
.intro-cover .cover-title { font-size: clamp(33px, 4vw, 46px); }
.book-intro-copy { padding-top: 5px; }
.book-intro-copy h1 { margin: 17px 0 19px; font: 400 clamp(36px, 5vw, 53px)/1.3 var(--serif); letter-spacing: .045em; }
.intro-lead { margin: 0 0 14px; font: 19px/1.7 var(--serif); }
.intro-description { max-width: 590px; margin: 0; color: var(--ink-soft); font: 14px/2 var(--serif); }
.intro-facts { display: flex; gap: 42px; margin: 28px 0; padding: 17px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.intro-facts div { display: grid; gap: 7px; }
.intro-facts span { color: #89877d; font-size: 10px; }
.intro-facts strong { font: 13px var(--serif); font-weight: 400; }
.primary-button, .secondary-button { display: inline-flex; align-items: center; justify-content: center; gap: 18px; min-height: 43px; padding: 0 18px; border: 1px solid var(--ink); background: var(--ink); color: var(--white); font-size: 12px; cursor: pointer; }
.primary-button:hover { border-color: var(--brass); background: var(--brass); }
.primary-button span { color: var(--brass-light); }
.toc-section { padding: 29px 0 0; border-top: 1px solid var(--line); }
.toc-heading { display: flex; align-items: end; justify-content: space-between; margin-bottom: 19px; }
.toc-note { color: #908e84; font-size: 10px; }
.toc-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.toc-list li { border-bottom: 1px solid var(--line); }
.toc-entry { display: grid; grid-template-columns: 48px 1fr auto; align-items: center; gap: 16px; width: 100%; padding: 16px 4px; border: 0; background: none; text-align: left; cursor: pointer; }
.toc-entry:hover .toc-title { color: var(--brass); }
.toc-number { color: var(--brass); font: 15px var(--serif); }
.toc-title { font: 15px var(--serif); }
.toc-part { color: #8b897f; font-size: 10px; }
.safety-note { margin: 28px 0 0; color: #74736a; font-size: 11px; line-height: 1.8; }
.safety-note span { margin-right: 7px; color: var(--brass); }

.reader-view { min-height: calc(100vh - 88px); }
.reader-topline { height: 58px; padding: 0 clamp(22px, 5.5vw, 80px); display: grid; grid-template-columns: 1fr 1fr 1fr; align-items: center; border-bottom: 1px solid var(--line); }
.reader-book-title { justify-self: center; color: var(--ink-soft); font: 12px var(--serif); white-space: nowrap; }
.reader-book-title span { color: var(--brass); }
.reader-divider { margin: 0 11px; color: var(--line) !important; }
.reader-data-button { justify-self: end; padding: 5px 0; border: 0; background: none; color: var(--ink-soft); font-size: 11px; cursor: pointer; }
.reader-data-button:hover { color: var(--brass); }
.reading-progress { height: 2px; background: var(--paper-deep); }
.reading-progress span { display: block; width: 0; height: 100%; background: var(--brass); transition: width .2s ease; }
.reader-layout { max-width: 1240px; margin: 0 auto; display: grid; grid-template-columns: 245px minmax(0, 690px); gap: clamp(40px, 8vw, 125px); padding: 53px 40px 90px; }
.reader-sidebar { align-self: start; position: sticky; top: 26px; padding-top: 6px; }
.reader-sidebar h2 { margin-bottom: 23px; font-size: 23px; }
#reader-toc { display: grid; gap: 2px; }
.reader-toc-link { display: grid; grid-template-columns: 25px 1fr; gap: 8px; align-items: baseline; padding: 9px 8px; border-left: 1px solid transparent; color: #77766d; font: 12px/1.6 var(--serif); text-align: left; }
button.reader-toc-link { width: 100%; border-top: 0; border-right: 0; border-bottom: 0; background: transparent; cursor: pointer; }
.reader-toc-link:hover, .reader-toc-link.is-current { border-left-color: var(--brass); color: var(--ink); }
.reader-toc-link span:first-child { color: var(--brass); font-size: 10px; }
.local-note { margin: 25px 0 0; color: #8d8b81; font-size: 10px; line-height: 1.7; }
.local-note span { color: var(--brass); margin-right: 4px; }
.chapter-content { min-width: 0; }
.chapter-meta { display: flex; justify-content: space-between; color: var(--brass); font-size: 10px; letter-spacing: .12em; }
.chapter-content h1 { margin: 18px 0 13px; font: 400 clamp(34px, 4.4vw, 48px)/1.35 var(--serif); letter-spacing: .025em; }
.chapter-deck { margin: 0; color: var(--ink-soft); font: 17px/1.8 var(--serif); }
.chapter-tools { display: flex; gap: 19px; margin: 23px 0 31px; padding: 12px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.tool-button { padding: 4px 0; border: 0; background: none; color: #77766d; font-size: 11px; cursor: pointer; }
.tool-button:hover, .tool-button[aria-pressed="true"] { color: var(--brass); }
.tool-button span:first-child { margin-right: 3px; color: var(--brass); }
.chapter-body { color: #3d3e38; font: 16px/2.05 var(--serif); }
.chapter-body h2 { margin: 34px 0 12px; font: 400 23px/1.5 var(--serif); }
.chapter-body p { margin: 0 0 19px; }
.chapter-body ul { padding-left: 1.3em; }
.chapter-body li { padding-left: .3em; margin: 7px 0; }
.chapter-body blockquote { margin: 25px 0; padding: 12px 17px; border-left: 2px solid var(--brass-light); background: #f0eee7; color: #77766d; font: 12px/1.8 var(--sans); }
.prototype-note { margin: 31px 0; padding: 14px 17px; border-left: 2px solid var(--brass-light); background: #f0eee7; color: #77766d; font: 12px/1.8 var(--sans); }
.chapter-source { margin-top: 33px; padding-top: 13px; border-top: 1px solid var(--line); color: #86847a; font-size: 10px; line-height: 1.8; }
.chapter-source a { color: var(--brass); text-decoration: underline; text-underline-offset: 3px; }
.content-load-error { max-width: 660px; margin: 12vh auto; padding: 0 24px; color: var(--ink-soft); font: 16px/1.9 var(--serif); text-align: center; }
.chapter-pagination { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; margin-top: 42px; padding-top: 14px; border-top: 1px solid var(--line); }
.chapter-nav-button { display: grid; gap: 8px; padding: 6px 0; border: 0; background: none; text-align: left; cursor: pointer; }
.chapter-nav-button span { color: #8b897f; font-size: 10px; }
.chapter-nav-button strong { font: 13px var(--serif); font-weight: 400; }
.chapter-nav-button:hover strong { color: var(--brass); }
.next-chapter { text-align: right; }

.data-dialog { position: fixed; width: min(520px, calc(100% - 32px)); max-height: min(85vh, 760px); overflow: auto; padding: 32px; border: 1px solid var(--line); background: var(--paper); color: var(--ink); box-shadow: 0 18px 80px #16160f30; }
.data-dialog::backdrop { background: #25251f80; backdrop-filter: blur(2px); }
.data-dialog h2 { margin: 0 0 12px; font: 400 28px var(--serif); }
.data-dialog > p:not(.section-kicker):not(.dialog-message) { color: var(--ink-soft); font: 13px/1.9 var(--serif); }
.data-dialog form { position: absolute; top: 15px; right: 18px; }
.dialog-close { border: 0; background: none; color: var(--ink-soft); font-size: 25px; cursor: pointer; }
.data-actions { display: flex; flex-wrap: wrap; gap: 10px; padding: 9px 0 24px; border-bottom: 1px solid var(--line); }
.secondary-button { border-color: var(--line); background: transparent; color: var(--ink); }
.secondary-button:hover { border-color: var(--brass); color: var(--brass); }
.saved-items h3 { display: flex; justify-content: space-between; margin: 22px 0 10px; font: 15px var(--serif); }
.saved-items h3 span { color: var(--brass); font: 11px var(--sans); }
.muted-empty { color: #8b897f; font-size: 11px; }
.highlight-list, .bookmark-list { display: grid; gap: 8px; }
.saved-item { padding: 12px; border: 1px solid var(--line); background: var(--white); }
.saved-item blockquote { margin: 0 0 8px; font: 13px/1.8 var(--serif); }
.saved-item small { display: flex; justify-content: space-between; gap: 10px; color: #8b897f; font-size: 9px; }
.saved-item button { padding: 0; border: 0; background: none; color: var(--brass); font-size: 10px; cursor: pointer; }
.dialog-message { min-height: 1em; margin: 12px 0 0; color: var(--brass); font-size: 11px; }
.toast { position: fixed; z-index: 5; right: 24px; bottom: 24px; padding: 11px 16px; background: var(--ink); color: var(--white); font-size: 12px; opacity: 0; transform: translateY(8px); pointer-events: none; transition: .2s ease; }
.toast.is-visible { opacity: 1; transform: translateY(0); }

@media (min-width: 900px) {
  .book-card { grid-template-columns: minmax(270px, 34%) minmax(0, 1fr); }
}
@media (max-width: 680px) {
  .site-header { height: 72px; padding: 0 20px; }
  .wordmark-seal { width: 34px; height: 34px; font-size: 19px; }
  .wordmark-copy strong { font-size: 19px; }
  .top-nav { gap: 17px; }
  .top-link { font-size: 11px; }
  .home-view { padding: 64px 21px 0; }
  .home-heading { padding-bottom: 54px; }
  .home-heading h1 { margin-top: 20px; font-size: 39px; }
  .home-intro { font-size: 12px; line-height: 1.8; }
  .section-heading { padding: 20px 0 20px; }
  .search-box { width: 145px; }
  .book-card { grid-template-columns: minmax(0, 1fr); gap: 23px; padding-bottom: 31px; }
  .cover-button { max-width: 290px; margin: 0 auto; }
  .book-cover { padding: 21px 22px 17px; }
  .cover-title { font-size: 38px; }
  .book-details { padding: 0; }
  .book-details h3 { margin-top: 16px; font-size: 27px; }
  .book-summary { font-size: 14px; }
  .book-card-footer { margin-top: 22px; }
  .book-card-actions { gap: 12px; }
  .site-footer { align-items: flex-start; gap: 12px; font-size: 9px; }
  .page-shell { padding: 22px 21px 52px; }
  .book-intro-grid { grid-template-columns: 1fr; gap: 34px; padding: 23px 0 49px; }
  .intro-cover { width: min(68%, 270px); }
  .book-intro-copy h1 { font-size: 39px; }
  .intro-lead { font-size: 17px; }
  .intro-description { font-size: 13px; }
  .intro-facts { gap: 25px; }
  .toc-heading { align-items: start; gap: 15px; }
  .toc-heading h2 { font-size: 25px; }
  .toc-note { padding-top: 6px; text-align: right; }
  .toc-entry { grid-template-columns: 34px 1fr; gap: 9px; padding: 14px 2px; }
  .toc-part { display: none; }
  .toc-title { font-size: 13px; }
  .reader-topline { height: 53px; padding: 0 17px; grid-template-columns: auto 1fr auto; gap: 10px; }
  .reader-topline .back-link { gap: 5px; font-size: 10px; white-space: nowrap; }
  .reader-book-title { font-size: 10px; }
  .reader-divider { margin: 0 4px; }
  .reader-data-button { font-size: 9px; white-space: nowrap; }
  .reader-layout { display: block; padding: 29px 22px 58px; }
  .reader-sidebar { position: static; padding: 0 0 14px; border-bottom: 1px solid var(--line); }
  .reader-sidebar .section-kicker { display: none; }
  .reader-sidebar h2 { display: none; }
  #reader-toc { display: flex; gap: 7px; overflow-x: auto; margin: 0 -4px; padding: 1px 4px 6px; }
  .reader-toc-link { flex: 0 0 auto; display: flex; gap: 5px; padding: 6px 8px; border: 1px solid var(--line); font: 10px var(--sans); white-space: nowrap; }
  button.reader-toc-link { width: auto; border-top: 1px solid var(--line); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
  .reader-toc-link.is-current { border-color: var(--brass); }
  .local-note { display: none; }
  .chapter-content { padding-top: 28px; }
  .chapter-content h1 { font-size: 35px; }
  .chapter-deck { font-size: 15px; }
  .chapter-body { font-size: 15px; }
  .chapter-body h2 { font-size: 21px; }
  .chapter-pagination { gap: 9px; }
  .chapter-nav-button strong { font-size: 11px; }
  .data-dialog { padding: 28px 21px 22px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
}