:root {
  color-scheme: light;
  --paper: #f4f7fb;
  --ink: #16273a;
  --muted: #43566a;
  --link: #164f76;
  --rule: #a7bdcf;
  --tint: #e7eef6;
  --focus: #9b3024;
  --sans: system-ui, "Segoe UI", sans-serif;
  --display: Georgia, serif;
  --edge: clamp(1rem, 4vw, 2rem);
  scrollbar-color: var(--muted) var(--paper);
}

:lang(zh-Hans) {
  --sans: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", sans-serif;
  --display: "Songti SC", SimSun, serif;
}

:lang(zh-Hant) {
  --sans: "Microsoft JhengHei", "PingFang TC", "Noto Sans CJK TC", sans-serif;
  --display: "Songti TC", PMingLiU, serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.125rem;
  line-height: 1.7;
  overflow-wrap: anywhere;
}

a {
  color: var(--link);
  cursor: pointer;
  text-underline-offset: .18em;
}

a:hover { text-decoration-thickness: .13em; }

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  inset: .75rem auto auto var(--edge);
  z-index: 1;
  padding: .5rem 1rem;
  background: var(--paper);
}

.skip:not(:focus) { clip-path: inset(50%); }

.reading {
  inline-size: min(45rem, calc(100% - 2 * var(--edge)));
  margin-inline: auto;
}

.site-header { border-block-end: 1px solid var(--rule); }

.masthead, .section-nav, .language-nav, .related {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
}

.masthead {
  justify-content: space-between;
  gap: 0 1rem;
  padding-block-start: .85rem;
}

.section-nav, .language-nav, .related {
  margin: 0;
  padding: 0;
  list-style: none;
}

.section-nav, .language-nav { gap: 0 1rem; }
.section-nav { padding-block: .2rem; }

.brand {
  color: var(--ink);
  font-size: 1.125rem;
  font-weight: 700;
  text-decoration: none;
}

.site-header a, .related a {
  display: inline-flex;
  align-items: center;
  min-block-size: 2.75rem;
  font-size: 1rem;
}

.site-header .brand { font-size: 1.125rem; }
.site-header nav a { text-decoration: none; }
.site-header nav a:hover { text-decoration: underline; }

.site-header a[aria-current="page"] {
  color: var(--ink);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-thickness: .12em;
}

.page { padding-block: clamp(2rem, 6vw, 4rem); }

h1, h2 {
  line-height: 1.2;
  text-wrap: balance;
}

h1 {
  margin: 0 0 1.6rem;
  font-family: var(--display);
  font-size: clamp(2.3rem, 5vw, 3.65rem);
  font-weight: 700;
}

.page-home h1 {
  font-size: clamp(2.65rem, 7vw, 4.15rem);
}

h2 {
  margin: 2.2rem 0 .8rem;
  font-size: clamp(1.32rem, 2vw, 1.65rem);
}

p { margin: 0 0 1rem; }
main li + li { margin-block-start: .35rem; }
nav li + li, .related li + li, .timeline li + li { margin-block-start: 0; }

.lead {
  padding: 1.15rem 0 1.15rem clamp(.9rem, 3vw, 1.5rem);
  border-inline-start: .25rem solid var(--link);
  font-size: clamp(1.125rem, 2.6vw, 1.45rem);
  line-height: 1.5;
}

.lead p { margin-block-end: .2rem; }
.lead p:last-child {
  margin: .65rem 0 0;
  color: var(--link);
  font-weight: 700;
}

.home-share {
  margin-block: 1.25rem 2.2rem;
  border-block-start: 1px solid var(--rule);
  padding-block-start: .5rem;
  font-size: 1rem;
}

.home-share p { margin: 0; }

.share-link {
  display: inline-flex;
  align-items: center;
  min-block-size: 2.75rem;
  font-weight: 650;
}

.home-share small {
  display: block;
  color: var(--muted);
}

.share-copy summary {
  inline-size: fit-content;
  padding-block: .65rem;
  color: var(--link);
  cursor: pointer;
}
.share-copy summary:hover, .share-copy summary:active { text-decoration: underline; }
.share-copy pre {
  margin: .25rem 0 0;
  padding: .85rem 1rem;
  border-inline-start: 1px solid var(--rule);
  background: var(--tint);
  font: inherit;
  white-space: pre-wrap;
}

.related { gap: 0 1.15rem; margin-block: 0 1rem; }

.reflection {
  margin: 2.5rem 0 0;
  padding: 1rem 1.25rem;
  background: var(--tint);
  border-block-start: 1px solid var(--rule);
}

.reflection p, blockquote { margin: 0; }
figcaption { margin-block-start: .4rem; }

.timeline { padding: 0; list-style: none; }
.event {
  display: grid;
  grid-template-columns: 7.1rem minmax(0, 1fr);
  gap: .3rem 1rem;
  padding-block: 1.1rem;
  border-block-start: 1px solid var(--rule);
}

.event time { color: var(--link); font-weight: 650; }
.event p { margin-block-end: .5rem; }
.event p:last-child { margin: 0; }

.citations, figcaption, .checked, .site-footer {
  color: var(--muted);
  font-size: .875rem;
}

.source-entry { margin-block-end: .55rem; }
.corrections { font-weight: 600; }
.site-footer { border-block-start: 1px solid var(--rule); padding-block: 1.15rem; }
.site-footer p { margin: 0; }

.error-translations {
  display: block;
  margin-block-start: .5rem;
  font-family: var(--sans);
  font-size: clamp(1rem, 3vw, 1.35rem);
  font-weight: 500;
  color: var(--muted);
}

.error-translations span + span { margin-inline-start: .65rem; }

@media (max-width: 38rem) {
  .masthead { display: block; padding-block-start: .35rem; }
  .section-nav { border-block-start: 1px solid var(--rule); gap: 0 .75rem; }
  .event { grid-template-columns: minmax(0, 1fr); }
}

@media (forced-colors: active) {
  :root { scrollbar-color: auto; }
  :focus-visible { outline-color: Highlight; }
}