:root {
  color-scheme: light;
  --paper: #fbfcfd;
  --sky: #dceef8;
  --sky-light: #ecf5fa;
  --ink: #15374d;
  --muted: #526a7a;
  --blue: #235f91;
  --line: #c4d9e7;
  --body: "Avenir Next", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --display: "Songti SC", "Noto Serif CJK SC", "SimSun", serif;
}

* { box-sizing: border-box; }
html[lang="en"] { --display: "Iowan Old Style", "Palatino Linotype", Palatino, serif; }
html { scroll-padding-top: 24px; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--body); -webkit-font-smoothing: antialiased; }
::selection { background: var(--line); color: var(--ink); }
a { color: var(--blue); text-underline-offset: 5px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible { outline: 2px solid var(--blue); outline-offset: 6px; border-radius: 2px; }
p { margin: 0; }
.wrap { width: min(1080px, calc(100% - 96px)); margin-inline: auto; }
.skip-link { position: absolute; top: 16px; left: 16px; z-index: 2; padding: 12px 18px; background: var(--paper); transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }
.masthead { background: var(--sky); }
.site-header { display: flex; align-items: center; justify-content: space-between; gap: 32px; min-height: 108px; border-bottom: 1px solid var(--line); }
.brand { color: var(--ink); text-decoration: none; display: inline-flex; flex-direction: column; gap: 6px; flex-shrink: 0; max-width: 100%; }
.brand-name { font-family: var(--body); font-size: 22px; font-weight: 600; letter-spacing: -.5px; line-height: 1.3; }
.brand-detail { color: var(--muted); font-size: 11px; letter-spacing: 1.3px; }
.header-actions { display: flex; align-items: center; gap: 28px; min-width: 0; }
.site-nav { display: flex; gap: 28px; flex-wrap: wrap; }
.site-nav a { color: var(--ink); text-decoration: none; font-size: 14px; padding-block: 10px; }
.site-nav a:hover, .site-nav a[aria-current="page"] { text-decoration: underline; }
.language-switch { display: flex; align-items: center; gap: 12px; flex-shrink: 0; border-left: 1px solid var(--line); padding-left: 22px; }
.language-switch a { color: var(--muted); font-size: 12px; line-height: 1.5; padding-block: 12px; text-decoration: none; }
.language-switch a:hover { text-decoration: underline; }
.language-switch a[aria-current="true"] { color: var(--ink); font-weight: 600; text-decoration: underline; }
.eyebrow { font-family: "SFMono-Regular", Consolas, monospace; font-size: 11px; line-height: 1.6; letter-spacing: 1.8px; color: var(--blue); }
.hero { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, .8fr); gap: 80px; align-items: center; padding-block: 70px 75px; }
h1 { margin: 18px 0 24px; font-family: var(--display); font-size: clamp(38px, 4.4vw, 56px); font-weight: 500; line-height: 1.27; letter-spacing: -.6px; }
.hero-copy { max-width: 550px; color: var(--muted); font-size: 16px; line-height: 1.95; }
.text-link { display: inline-flex; align-items: center; gap: 12px; margin-top: 28px; font-size: 14px; font-weight: 500; }
.hero-facts { border-top: 1px solid var(--blue); padding-top: 22px; }
.hero-facts h2 { font-size: 18px; font-weight: 500; margin: 0 0 22px; }
.facts { margin: 0; }
.facts > div { display: grid; grid-template-columns: 62px minmax(0, 1fr); gap: 18px; padding-block: 14px; border-bottom: 1px solid var(--line); font-size: 14px; line-height: 1.75; }
.facts dt { color: var(--muted); }
.facts dd { margin: 0; }
.horizon { height: 4px; background: var(--blue); }
.overview { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 70px; padding-block: 48px 24px; }
.overview h2 { margin: 0 0 15px; font-size: 18px; font-weight: 500; }
.overview p { color: var(--muted); font-size: 14px; line-height: 1.9; }
.site-footer { display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: 16px 32px; border-top: 1px solid var(--line); padding-block: 24px 32px; margin-top: 26px; font-size: 12px; line-height: 1.8; color: var(--muted); }
.footer-links { display: flex; gap: 22px; flex-wrap: wrap; }
.site-footer a { color: var(--muted); }
.page-intro { padding-block: 54px 48px; }
.page-intro h1 { margin-bottom: 13px; font-size: clamp(34px, 4vw, 44px); }
.page-intro .subtitle { color: var(--muted); font-size: 14px; line-height: 1.8; }
.document-layout { display: grid; grid-template-columns: 205px minmax(0, 1fr); gap: 70px; padding-block: 45px 18px; }
.document-summary { font-size: 13px; line-height: 1.9; color: var(--muted); }
.document-summary strong { display: block; color: var(--ink); font-weight: 500; margin-bottom: 12px; }
.document-summary p + p { margin-top: 16px; }
.document { max-width: 710px; min-width: 0; }
.document section { padding-bottom: 29px; margin-bottom: 29px; border-bottom: 1px solid var(--line); }
.document section:last-child { border-bottom: 0; margin-bottom: 0; }
.document h2 { font-size: 19px; font-weight: 500; margin: 0 0 15px; line-height: 1.55; }
.document p, .document li { font-size: 14px; color: var(--muted); line-height: 1.95; overflow-wrap: anywhere; }
.document p + p { margin-top: 12px; }
.document ul { padding-left: 21px; margin: 12px 0 0; }
.document li + li { margin-top: 8px; }
.document .note { border-left: 2px solid var(--blue); background: var(--sky-light); padding: 15px 19px; margin-top: 16px; }
.contact-link { overflow-wrap: anywhere; }
.not-found { min-height: 50vh; padding-block: 65px; }

@media (max-width: 880px) {
  .wrap { width: calc(100% - 56px); }
  .hero { gap: 42px; padding-block: 55px 58px; }
  .overview { gap: 28px; }
  .document-layout { grid-template-columns: 170px minmax(0, 1fr); gap: 38px; }
}

@media (max-width: 640px) {
  .wrap { width: calc(100% - 40px); }
  .site-header { position: relative; align-items: flex-start; gap: 19px; flex-direction: column; padding-block: 22px 15px; }
  .brand { max-width: calc(100% - 80px); }
  .header-actions { display: block; }
  .language-switch { position: absolute; top: 16px; right: 0; padding-left: 0; border-left: 0; }
  .language-switch a { min-height: 44px; }
  .site-nav { gap: 24px; }
  .site-nav a { display: inline-block; min-height: 44px; padding-block: 12px; }
  .hero { grid-template-columns: 1fr; gap: 35px; padding-block: 37px 43px; }
  h1 { font-size: 42px; margin-block: 14px 20px; }
  html[lang="en"] .hero h1 { font-size: 36px; }
  .hero-copy { font-size: 15px; }
  .hero-facts { padding-top: 20px; }
  .hero-facts h2 { margin-bottom: 8px; font-size: 17px; }
  .facts > div { grid-template-columns: 58px minmax(0, 1fr); gap: 12px; padding-block: 11px; }
  .overview { grid-template-columns: 1fr; gap: 28px; padding-block: 33px; }
  .overview h2 { margin-bottom: 9px; }
  .site-footer { margin-top: 12px; padding-block: 22px 28px; gap: 14px; }
  .footer-links { gap: 18px; }
  .page-intro { padding-block: 32px; }
  .page-intro h1 { font-size: 36px; }
  .document-layout { grid-template-columns: 1fr; gap: 27px; padding-top: 30px; }
  .document-summary { padding-bottom: 22px; border-bottom: 1px solid var(--line); }
  .document-summary p + p { margin-top: 8px; }
  .document section { padding-bottom: 23px; margin-bottom: 23px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}