:root {
  color-scheme: light;
  --paper: #faf8f2;
  --ink: #182c2d;
  --muted: #4f5d58;
  --rule: #d8ddd1;
  --accent: #206353;
  --serif: Georgia, "Noto Serif CJK SC", "Songti SC", "STSong", serif;
  --sans: system-ui, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--paper);
  color: var(--ink);
  font: 100%/1.6 var(--sans);
}

* { box-sizing: border-box; }
body { margin: 0; }
a { color: var(--accent); text-underline-offset: .18em; }
a:hover { text-decoration-thickness: .12em; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: .25rem; }
.frame { width: min(calc(100% - 2.5rem), 65rem); margin-inline: auto; }
.skip { position: absolute; top: -5rem; left: 1rem; padding: .5rem; background: var(--paper); }
.skip:focus { top: .25rem; z-index: 1; }

.preview {
  padding: .35rem 1.25rem;
  background: #e7ede2;
  color: #344d43;
  text-align: center;
  font-size: .76rem;
}

.masthead {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .65rem 1rem;
  border-bottom: 1px solid var(--rule);
  padding-block: .95rem;
}

.brand { color: var(--ink); font-weight: 750; text-decoration: none; }
.brand span { color: var(--accent); font-weight: 600; margin-inline-start: .25rem; }
.languages { display: flex; align-items: center; gap: 1rem; font-size: .875rem; }
.languages a { color: var(--muted); text-decoration: none; padding-block: .3rem; }
.languages a[aria-current="page"] { color: var(--ink); text-decoration: underline; font-weight: 700; }

.landing { padding-block: clamp(2rem, 8vw, 5.5rem) 4.5rem; }
.intro h1, .feature h2, .prose h1, .prose h2 { font-family: var(--serif); line-height: 1.17; }
.intro h1 { font-size: clamp(2.45rem, 7vw, 5.15rem); margin: 0; letter-spacing: -.035em; }
.intro p { color: var(--muted); margin: .85rem 0 0; font-size: 1.06rem; }

.feature {
  margin-top: clamp(1.8rem, 6vw, 3.7rem);
  padding: clamp(1.25rem, 5vw, 3rem);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--accent);
  background: #f0f2e9;
}

.eyebrow {
  margin: 0 0 1.05rem;
  color: var(--accent);
  font: 700 .75rem/1.5 var(--sans);
  letter-spacing: .07em;
  text-transform: uppercase;
}
.eyebrow span { color: #748174; margin-inline: .3rem; }
.feature h2 { max-width: 22ch; margin: 0; font-size: clamp(1.95rem, 5vw, 3.7rem); }
.feature h2 a { color: var(--ink); text-decoration: none; }
.feature h2 a:hover { text-decoration: underline; }
.dek { max-width: 39rem; color: var(--muted); margin-block: 1rem 1.4rem; }
.read-link { font-size: .9rem; font-weight: 700; }

.reading { padding-block: clamp(2rem, 7vw, 5rem) 4rem; }
.prose { max-width: 44rem; margin-inline: auto; font: clamp(1.07rem, 1.6vw, 1.2rem)/1.78 var(--serif); overflow-wrap: anywhere; }
.prose h1 { margin: 0 0 1.4rem; font-size: clamp(2rem, 5.4vw, 4rem); letter-spacing: -.035em; }
.prose h2 { margin: 2.5em 0 .65em; font-size: clamp(1.42rem, 3.4vw, 1.95rem); }
.prose p, .prose ul { margin-block: 0 1.2em; }
.prose em { color: var(--muted); }
.prose li + li { margin-top: .3em; }
html[lang="zh-Hans"] .prose { line-height: 1.95; }
html[lang="zh-Hans"] .intro h1, html[lang="zh-Hans"] .prose h1 { letter-spacing: 0; }
.footer { border-top: 1px solid var(--rule); padding-block: 1.2rem 2rem; font-size: .875rem; }
.footer a { color: var(--muted); }

@media (max-width: 35rem) {
  .frame { width: calc(100% - 2rem); }
  .masthead { padding-block: .65rem; }
  .feature h2 { max-width: none; }
}