:root {
  color-scheme: light;
  --paper: #f8f7f3;
  --ink: #292e2a;
  --muted: #63685f;
  --line: #dedfd7;
  --green: #365d45;
  --code: #efefe8;
  --serif: "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", STSong, SimSun, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 32px; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 16px/1.9 var(--sans); }
::selection { background: #d8e4d4; color: #1f3929; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 5px; }
a:hover { color: var(--green); }
a:focus-visible { outline: 2px solid var(--green); outline-offset: 6px; border-radius: 2px; }
.page { max-width: 1120px; margin: 0 auto; padding: 0 48px; }
.skip-link { position: absolute; top: -80px; left: 16px; padding: 8px 16px; background: var(--ink); color: white; z-index: 2; }
.skip-link:focus { top: 12px; }
.skip-link:hover { color: white; text-decoration: underline; }
.site-header { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 28px 0; border-bottom: 1px solid var(--line); }
.wordmark { font-weight: 600; font-size: 18px; text-decoration: none; letter-spacing: .04em; }
.site-domain { display: inline-block; margin-left: 16px; font-size: 12px; font-weight: 400; letter-spacing: .02em; color: var(--muted); }
nav { display: flex; gap: 28px; font-size: 14px; }
nav a { text-decoration: none; }
.intro { padding: 80px 0 72px; }
h1 { margin: 0 0 24px; font: 500 clamp(36px, 5vw, 56px)/1.55 var(--serif); letter-spacing: .035em; text-wrap: balance; }
.intro p { color: var(--muted); margin: 0 0 26px; }
.read-link { color: var(--green); font-size: 14px; text-decoration: none; }
.read-link span { margin-left: 12px; }
.section-heading { display: flex; justify-content: space-between; align-items: baseline; gap: 20px; border-top: 1px solid var(--ink); padding-top: 18px; }
h2 { margin: 0; font-size: 18px; font-weight: 600; }
.section-heading > span { font-size: 12px; color: var(--muted); letter-spacing: .1em; }
.reading-layout { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 56px; padding-top: 40px; }
.contents { align-self: start; position: sticky; top: 32px; font-size: 13px; color: var(--muted); }
.contents p { margin: 0 0 14px; font-size: 12px; }
.contents ol { list-style: none; padding: 0; margin: 0; }
.contents li { margin-bottom: 15px; }
.contents a { text-decoration: none; }
.articles { min-width: 0; }
article { padding: 0 0 42px; margin-bottom: 42px; border-bottom: 1px solid var(--line); scroll-margin-top: 28px; }
article:last-child { margin-bottom: 0; border-bottom: 0; }
.article-meta { display: flex; gap: 14px; color: var(--muted); font-size: 12px; }
.article-meta span + span::before { content: "/"; margin-right: 14px; color: var(--muted); }
h3 { font: 600 28px/1.5 var(--serif); margin: 12px 0 24px; text-wrap: balance; }
h4 { font-size: 16px; font-weight: 600; margin: 28px 0 10px; }
article p { margin: 0 0 18px; overflow-wrap: break-word; }
code { font: .85em/1.8 "SFMono-Regular", Consolas, "Liberation Mono", monospace; }
p code { background: var(--code); padding: 2px 5px; border-radius: 3px; overflow-wrap: anywhere; }
pre { margin: 20px 0 24px; padding: 22px 24px; background: var(--code); overflow-x: auto; border-radius: 4px; tab-size: 4; }
pre code { font-size: 13px; }
article .takeaway { color: var(--green); margin: 26px 0 0; font-size: 15px; }
.about { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 56px; border-top: 1px solid var(--ink); padding: 32px 0 44px; }
.about p { color: var(--muted); font-size: 14px; margin: 0 0 12px; }
.site-footer { border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; gap: 12px 28px; padding: 24px 0 32px; color: var(--muted); font-size: 12px; }
.site-footer a { text-decoration: none; }
.back-top { margin-left: auto; }
@media (max-width: 760px) {
  .page { padding: 0 24px; }
  .site-header { padding: 22px 0; gap: 16px; }
  .wordmark { font-size: 16px; }
  .site-domain { display: block; margin-left: 0; margin-top: 2px; font-size: 11px; }
  nav { gap: 20px; font-size: 13px; }
  .intro { padding: 52px 0 48px; }
  h1 { font-size: clamp(30px, 6.3vw, 44px); }
  .intro p { font-size: 14px; }
  .reading-layout { grid-template-columns: 1fr; gap: 32px; padding-top: 26px; }
  .contents { position: static; border-bottom: 1px solid var(--line); padding-bottom: 14px; }
  .contents li { margin-bottom: 10px; }
  h3 { font-size: 25px; }
  pre { padding: 18px 16px; }
  .about { grid-template-columns: 1fr; gap: 16px; padding-top: 26px; }
  .section-heading > span { letter-spacing: 0; }
}
@media (max-width: 420px) {
  .page { padding: 0 20px; }
  .site-footer { flex-direction: column; gap: 8px; }
  .back-top { margin-left: 0; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }