:root {
  color-scheme: light;
  --paper: #fffefa;
  --ground: #f4f3ed;
  --ink: #253433;
  --muted: #526461;
  --accent: #17635b;
  --line: #d5ded8;
  --soft: #ecf4ef;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-padding-top: 1.5rem; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 19px/1.75 Georgia, "Times New Roman", serif; }
a { color: var(--accent); text-underline-offset: .18em; overflow-wrap: anywhere; }
a:hover { color: #0b403a; }
:focus-visible { outline: 3px solid #be7725; outline-offset: 4px; }
.skip-link { position: absolute; left: 1rem; top: -8rem; padding: .6rem 1rem; background: white; z-index: 10; }
.skip-link:focus { top: 1rem; }
.masthead { border-bottom: 1px solid var(--line); background: var(--ground); }
.masthead-inner { max-width: 1380px; margin: auto; padding: 1.2rem 2.2rem; display: flex; justify-content: space-between; align-items: center; gap: 1.5rem; }
.brand { color: var(--ink); text-decoration: none; font: 700 19px/1.35 var(--sans); letter-spacing: -.02em; }
.tagline { color: var(--muted); font: 13px/1.5 var(--sans); }
.layout { max-width: 1380px; margin: auto; display: grid; grid-template-columns: 270px minmax(0, 1fr); gap: 64px; padding: 2.4rem 2.2rem 5rem; }
.sidebar { align-self: start; position: sticky; top: 1.3rem; max-height: calc(100vh - 2.6rem); overflow-y: auto; padding-right: 1rem; scrollbar-width: thin; }
.book-nav { font: 14px/1.4 var(--sans); }
.book-nav h2 { font: 700 11px/1.4 var(--sans); letter-spacing: .13em; text-transform: uppercase; color: var(--muted); margin: 1.6rem .65rem .6rem; }
.book-nav h2:first-child { margin-top: 0; }
.book-nav ol, .book-nav ul { list-style: none; padding: 0; margin: 0; }
.book-nav a { display: block; text-decoration: none; color: var(--muted); padding: .5rem .65rem; margin: .12rem 0; border-radius: 5px; }
.book-nav a:hover { background: var(--ground); color: var(--ink); }
.book-nav a[aria-current="page"] { background: var(--soft); color: #14564e; box-shadow: inset 3px 0 var(--accent); }
.nav-label { display: block; font-size: 11px; font-weight: 700; letter-spacing: .03em; }
.nav-title { display: block; padding-top: .15rem; }
main { min-width: 0; max-width: 790px; width: 100%; }
.eyebrow { font: 700 11px/1.4 var(--sans); text-transform: uppercase; letter-spacing: .14em; color: var(--accent); margin: .3rem 0 .8rem; }
h1 { font: 500 clamp(2rem, 3.4vw, 3.05rem)/1.16 Georgia, "Times New Roman", serif; letter-spacing: -.035em; margin: 0 0 1.2rem; text-wrap: pretty; }
h2 { font: 600 1.52rem/1.3 Georgia, "Times New Roman", serif; letter-spacing: -.015em; margin: 2.6rem 0 .8rem; text-wrap: pretty; }
h3 { font: 700 1rem/1.45 var(--sans); margin: 2rem 0 .7rem; }
p { margin: 0 0 1.05rem; }
li { padding-left: .15rem; margin-bottom: .45rem; }
ol, ul { padding-left: 1.5rem; }
.page-tools { display: flex; flex-wrap: wrap; align-items: center; gap: .7rem 1.1rem; font: 13px/1.5 var(--sans); margin: 0 0 1.4rem; }
.download { display: inline-block; padding: .45rem .8rem; border: 1px solid var(--line); border-radius: 4px; text-decoration: none; background: var(--paper); }
.download:hover { background: var(--soft); }
.contents { font: 14px/1.6 var(--sans); border-block: 1px solid var(--line); margin: 1.4rem 0 2rem; padding: .75rem 0; }
summary { cursor: pointer; font-weight: 600; }
.contents ul { columns: 2; column-gap: 2rem; margin-bottom: .35rem; padding-left: 1.2rem; }
.contents li { break-inside: avoid; margin: .4rem 0; }
.chapter-content { overflow-wrap: break-word; }
.chapter-content > :first-child { margin-top: 0; }
.semantic-block { border-left: 4px solid var(--accent); background: var(--soft); padding: 1.35rem 1.55rem; margin: 2rem 0; border-radius: 0 7px 7px 0; }
.semantic-block > p:first-child { font-family: var(--sans); font-size: .94em; color: #164e48; margin-bottom: .75rem; }
.semantic-block > :last-child { margin-bottom: 0; }
.studyandlearn { background: #f6f1e5; border-color: #9a7338; }
.studyandlearn > p:first-child { color: #6b4d20; }
figure { margin: 2rem 0; }
img { max-width: 100%; height: auto; display: block; margin: 1.5rem auto; }
figcaption { font: 14px/1.5 var(--sans); color: var(--muted); margin-top: .5rem; }
.table-scroll { width: 100%; overflow-x: auto; margin: .7rem 0 1.7rem; scrollbar-color: #91aaa0 var(--ground); scrollbar-width: thin; }
.table-caption { font: 600 15px/1.55 var(--sans); margin: 1.7rem 0 .5rem; }
.table-caption p { margin: 0; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; padding: 0; }
.table-scroll:focus-visible { outline-offset: 2px; }
table { border-collapse: collapse; font: 15px/1.55 var(--sans); width: 100%; min-width: 480px; }
caption { caption-side: top; text-align: left; font-weight: 600; color: var(--ink); padding: 0 0 .85rem; }
th, td { text-align: left; vertical-align: top; padding: .8rem .65rem; border-bottom: 1px solid var(--line); }
th { background: var(--soft); font-weight: 650; }
tbody tr:nth-child(even) { background: #f7f8f3; }
.table-hint { display: none; color: var(--muted); font: 12px/1.5 var(--sans); margin: -1rem 0 1.5rem; }
.chapter-content blockquote { margin: 1.5rem 0; padding-left: 1.3rem; border-left: 3px solid var(--line); }
.reading-footer { border-top: 1px solid var(--line); margin-top: 3rem; padding-top: 1.3rem; }
.sequence { display: flex; justify-content: space-between; gap: 1.4rem; font: 14px/1.6 var(--sans); }
.sequence a:last-child { text-align: right; }
.edition-note { color: var(--muted); font: 12px/1.65 var(--sans); margin: 1.2rem 0 0; }
.mobile-menu { display: none; }
.standalone .layout { display: block; max-width: 900px; }
.standalone main { margin: auto; }
.standalone .masthead-inner { max-width: 900px; }
.separate-reading { color: var(--muted); }
@media (max-width: 1050px) {
  .layout { grid-template-columns: 230px minmax(0, 1fr); gap: 36px; padding-inline: 1.5rem; }
  .masthead-inner { padding-inline: 1.5rem; }
}
@media (max-width: 800px) {
  body { font-size: 18px; line-height: 1.75; }
  .masthead-inner { padding: 1rem 1.1rem; flex-wrap: wrap; gap: .5rem; }
  .tagline { display: none; }
  .layout { display: block; padding: 1.8rem 1.1rem 3rem; }
  .sidebar { display: none; }
  main { margin: auto; }
  .mobile-menu { display: block; width: 100%; font: 14px/1.5 var(--sans); }
  .mobile-menu summary { color: var(--accent); padding: .6rem 0 .15rem; }
  .mobile-menu nav { padding: 1.2rem 0 .5rem; }
  h1 { font-size: 2.2rem; }
  h2 { font-size: 1.45rem; margin-top: 2.1rem; }
  .contents ul { columns: 1; }
  .table-hint { display: block; }
  .semantic-block { padding: 1rem 1.1rem; margin: 1.6rem 0; }
  .sequence { flex-wrap: wrap; }
}
@media print {
  body { background: white; color: black; font-size: 11pt; line-height: 1.5; }
  .masthead, .sidebar, .mobile-menu, .page-tools, .contents, .skip-link, .sequence, .table-hint { display: none; }
  .layout, .standalone .layout { display: block; margin: 0; padding: 0; max-width: none; }
  main { max-width: none; }
  h1 { font-size: 25pt; }
  h2 { font-size: 17pt; break-after: avoid; }
  h3 { break-after: avoid; }
  p { orphans: 3; widows: 3; }
  a { color: inherit; }
  .table-scroll { overflow: visible; }
  table { min-width: 0; font-size: 9pt; }
  tr, img { break-inside: avoid; }
  .semantic-block { border: 1px solid #aaa; border-left: 3px solid #555; background: transparent; }
  .reading-footer { margin-top: 1.5rem; }
}