:root {
  color-scheme: light;
  --paper: #f6f3ec;
  --ink: #282722;
  --muted: #73695e;
  --accent: #80644b;
  --rule: #ded9ce;
  --serif: "Songti SC", "STSong", "Noto Serif CJK SC", "Noto Serif SC", "SimSun", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
}

* { box-sizing: border-box; }
body { margin: 0; }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 5px; }
ol { list-style: none; margin: 0; padding: 0; }
.skip-link { position: absolute; top: -80px; left: 24px; padding: 12px 16px; background: var(--paper); z-index: 2; }
.skip-link:focus { top: 12px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--paper);
  height: 104px;
  margin: 0 auto;
  padding: 0 44px;
  max-width: 1360px;
  border-bottom: 1px solid var(--rule);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.site-name { display: inline-flex; align-items: baseline; gap: 18px; font: 25px/1.4 var(--serif); }
.site-name span { font: 12px/1.4 var(--sans); color: var(--muted); letter-spacing: .08em; }
.directory-nav { display: flex; align-items: center; min-height: 44px; padding: 0 6px; font-size: 14px; letter-spacing: .06em; }

.reading-layout { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 64px; max-width: 1272px; margin: 0 auto; padding: 0 32px; }
.contents { border-right: 1px solid var(--rule); padding: 48px 26px 40px 0; }
.contents nav { position: sticky; top: 36px; max-height: calc(100vh - 72px); overflow: auto; scrollbar-width: thin; scrollbar-color: var(--rule) transparent; }
.contents-label { margin: 0 0 18px 14px; color: var(--muted); font-size: 12px; letter-spacing: .12em; }
.toc-link { display: flex; align-items: baseline; gap: 12px; min-height: 42px; padding: 10px 0 10px 14px; font-size: 13px; line-height: 1.6; border-left: 2px solid transparent; }
.toc-number { flex: 0 0 54px; color: var(--muted); font-size: 12px; white-space: nowrap; }
.toc-link[aria-current="page"] { color: var(--accent); border-left-color: var(--accent); }
.toc-link[aria-current="page"] .toc-number { color: inherit; }
.reading-main { min-width: 0; width: 100%; max-width: 760px; padding: 62px 12px 64px; }
.chapter-heading { margin-bottom: 44px; }
.chapter-heading h1 { margin: 0; font: 500 34px/1.5 var(--serif); letter-spacing: .045em; }
.chapter-number { display: block; margin-bottom: 12px; font: 13px/1.5 var(--sans); color: var(--muted); letter-spacing: .12em; }
.prose { font: 21px/1.95 var(--serif); letter-spacing: .015em; overflow-wrap: anywhere; }
.prose p { margin: 0 0 1.1em; text-indent: 2em; text-align: justify; text-justify: inter-ideograph; scroll-margin-top: 32px; }
.prose p:last-child { margin-bottom: 0; }
.chapter-navigation { display: flex; align-items: center; justify-content: space-between; gap: 16px; border-top: 1px solid var(--rule); margin-top: 52px; padding-top: 22px; color: var(--accent); font-size: 14px; }
.chapter-navigation a { display: flex; align-items: center; gap: 10px; min-height: 44px; }
.chapter-index { color: var(--muted); font: 13px/1.4 var(--serif); white-space: nowrap; }

.directory-main { max-width: 960px; margin: 0 auto; padding: 70px 36px 88px; }
.directory-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 20px; margin-bottom: 32px; }
.directory-heading h1 { margin: 0; font: 500 38px/1.5 var(--serif); letter-spacing: .08em; }
.directory-heading p { margin: 0; color: var(--muted); font-size: 12px; letter-spacing: .06em; }
.resume-link { display: grid; grid-template-columns: 100px 1fr 20px; align-items: center; gap: 16px; border-top: 1px solid var(--accent); border-bottom: 1px solid var(--rule); padding: 24px 12px; color: var(--accent); font-size: 14px; }
#resume-action { font-weight: 500; }
#resume-chapter { color: var(--muted); font-family: var(--serif); }
.link-arrow { text-align: right; font-size: 20px; font-weight: 400; }
.directory-list .toc-link { gap: 34px; padding: 19px 12px; border: 0; border-bottom: 1px solid var(--rule); font-family: var(--serif); font-size: 17px; }
.directory-list .toc-number { flex-basis: 72px; font-family: var(--sans); font-size: 12px; }
.directory-list .toc-link::after { content: "→"; margin-left: auto; color: var(--muted); font-family: var(--sans); font-size: 17px; }

@media (min-width: 1600px) {
  .reading-layout { gap: 88px; }
}
@media (max-width: 1000px) {
  .site-header { height: 88px; padding: 0 32px; }
  .reading-layout { display: block; padding: 0 36px; }
  .contents { display: none; }
  .reading-main { margin: 0 auto; padding-top: 50px; }
}
@media (max-width: 600px) {
  .site-header { height: 78px; padding: 0 24px; }
  .site-name { gap: 12px; font-size: 22px; }
  .site-name span { font-size: 11px; }
  .directory-nav { font-size: 13px; padding: 0; }
  .reading-layout { padding: 0 24px; }
  .reading-main { padding: 42px 0 36px; }
  .chapter-heading { text-align: center; margin-bottom: 34px; }
  .chapter-heading h1 { font-size: 29px; letter-spacing: .025em; }
  .chapter-number { margin-bottom: 14px; font-size: 12px; }
  .prose { font-size: 19px; line-height: 1.95; letter-spacing: .01em; }
  .prose p { margin-bottom: 1.05em; }
  .chapter-navigation { margin-top: 38px; padding-top: 14px; font-size: 13px; }
  .chapter-navigation a { gap: 7px; }
  .chapter-index { font-size: 12px; }
  .directory-main { padding: 42px 24px 52px; }
  .directory-heading { margin-bottom: 26px; }
  .directory-heading h1 { font-size: 32px; }
  .directory-heading p { font-size: 11px; }
  .resume-link { grid-template-columns: 1fr 20px; gap: 7px 12px; padding: 20px 0; }
  #resume-chapter { grid-column: 1; font-size: 14px; }
  .link-arrow { grid-column: 2; grid-row: 1 / 3; }
  .directory-list .toc-link { gap: 12px; padding: 18px 0; font-size: 16px; }
  .directory-list .toc-number { flex-basis: 62px; font-size: 11px; }
}