:root{
  --color-bg:#E8ECF7;
  --color-panel:#F4F6FC;
  --color-panel-strong:#D9DFF0;
  --color-border:#C4CCE3;
  --color-accent:#96502B;
  --color-accent-dark:#6E3A1E;
  --color-text:#171A2B;
  --color-text-muted:#5A6078;
  --color-success:#2F7D4F;
  --color-warn:#B7791F;
  --color-error:#B3322E;
  --color-ink:#1B2140;
  --color-ink-deep:#141833;
  --color-ink-shadow:#0F1228;
  --color-lane:#B9C3DE;
  --color-lane-muted:#7E8AAE;
  --color-white:#FFFFFF;
  --color-flag-red:#C8102E;
  --color-flag-blue:#1F3A93;
  --color-flag-green:#1C8A55;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --radius-small:6px;
  --radius-medium:8px;
  --header-height:64px;
  --gutter:clamp(16px,4vw,48px);
  --content-width:1344px;
  --reading-width:760px;
  --section-space:clamp(64px,9vw,120px);
  --shadow-panel:0 1px 1px rgba(23,26,43,.04),0 10px 28px -14px rgba(23,26,43,.22);
  --shadow-panel-hover:0 2px 3px rgba(23,26,43,.05),0 18px 40px -16px rgba(23,26,43,.28);
  --shadow-deep:0 2px 4px rgba(15,18,40,.22),0 26px 60px -22px rgba(15,18,40,.55);
  --shadow-button:0 1px 1px rgba(110,58,30,.18),0 8px 18px -10px rgba(110,58,30,.55);
  --transition-fast:180ms ease;
  --transition-reveal:600ms cubic-bezier(.22,1,.36,1);
  --toc-offset:132px;
}
*,
*::before,
*::after{box-sizing:border-box}
html{
  margin:0;
  padding:0;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-height) + 16px);
  background:var(--color-bg);
}
html.nav-open{overflow:hidden}
body{
  margin:0;
  min-width:320px;
  overflow-x:clip;
  background:var(--color-bg);
  color:var(--color-text);
  font-family:var(--font-body);
  font-size:15px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg,video,canvas{display:block;max-width:100%}
img{height:auto}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
a{color:inherit;text-decoration:none}
p{margin:0 0 1.1em}
ul,ol{margin:0;padding:0}
li{min-width:0}
table{border-collapse:collapse}
pre{
  max-width:100%;
  overflow-x:auto;
  padding:20px;
  border-radius:var(--radius-medium);
  background:var(--color-ink);
  color:var(--color-panel);
  font-family:var(--font-mono);
  line-height:1.65;
  -webkit-overflow-scrolling:touch;
}
code{
  font-family:var(--font-mono);
  font-size:.92em;
  overflow-wrap:anywhere;
}
:not(pre)>code{
  padding:.12em .35em;
  border:1px solid var(--color-border);
  border-radius:var(--radius-small);
  background:var(--color-panel-strong);
}
pre code{overflow-wrap:normal}
h1,h2,h3,h4{
  color:var(--color-text);
  font-family:var(--font-display);
  text-wrap:balance;
}
h1{
  margin:0;
  font-size:clamp(52px,5vw,68px);
  font-weight:900;
  line-height:1.1;
  letter-spacing:-.012em;
}
h2{
  margin:0 0 22px;
  font-size:clamp(32px,4vw,48px);
  font-weight:900;
  line-height:1.16;
  letter-spacing:-.01em;
}
h3{
  margin:30px 0 12px;
  font-size:clamp(21px,2.3vw,28px);
  font-weight:800;
  line-height:1.25;
}
h4{margin:22px 0 8px;font-size:18px}
.no-break{white-space:nowrap}
.keyword,.text-accent{color:var(--color-accent)}
.muted{color:var(--color-text-muted)}
.mono{font-family:var(--font-mono)}
.wrap{
  width:100%;
  max-width:var(--content-width);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.reading{
  width:100%;
  max-width:calc(var(--reading-width) + var(--gutter) * 2);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{
  padding-top:var(--section-space);
  padding-bottom:var(--section-space);
  overflow-x:clip;
}
.section--panel{background:var(--color-panel)}
.section-heading{max-width:820px;margin-bottom:42px}
.section-kicker,.eyebrow{
  display:inline-flex;
  min-height:24px;
  align-items:center;
  gap:9px;
  color:var(--color-text-muted);
  font-size:12.5px;
  font-weight:700;
  letter-spacing:.06em;
}
.section-kicker::before,.eyebrow::before{
  width:8px;
  height:8px;
  flex-shrink:0;
  border-radius:50%;
  background:var(--color-accent);
  content:"";
}
.lead{
  max-width:720px;
  color:var(--color-text-muted);
  font-size:clamp(17px,2vw,21px);
  line-height:1.75;
}
.sr-only{
  position:absolute;
  width:1px;
  height:1px;
  padding:0;
  margin:-1px;
  overflow:hidden;
  clip:rect(0,0,0,0);
  white-space:nowrap;
  border:0;
}
:focus-visible{
  outline:2px solid var(--color-accent);
  outline-offset:3px;
  border-radius:var(--radius-small);
}
.btn{
  display:inline-flex;
  min-width:24px;
  min-height:48px;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:10px 24px;
  border:1.5px solid transparent;
  border-radius:var(--radius-small);
  font-weight:750;
  line-height:1.2;
  text-align:center;
  transition:transform var(--transition-fast),background var(--transition-fast),color var(--transition-fast),border-color var(--transition-fast),box-shadow var(--transition-fast);
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(1px)}
.btn-primary{
  background:var(--color-accent);
  color:var(--color-panel);
  box-shadow:var(--shadow-button);
}
.btn-primary:hover{background:var(--color-accent-dark)}
.btn-secondary{
  border-color:var(--color-text);
  background:transparent;
  color:var(--color-text);
}
.btn-secondary:hover{background:var(--color-text);color:var(--color-panel)}
.btn-subtle{
  border-color:var(--color-border);
  background:var(--color-panel);
  color:var(--color-text);
}
.btn-subtle:hover{border-color:var(--color-text)}
.btn[aria-disabled="true"],.btn:disabled{cursor:not-allowed;opacity:.55;transform:none}
.button-row{display:flex;flex-wrap:wrap;gap:12px}
.panel,.card{
  min-width:0;
  border:1px solid var(--color-border);
  border-radius:var(--radius-medium);
  background:var(--color-panel);
  box-shadow:var(--shadow-panel);
}
.card{
  padding:24px;
  transition:transform 220ms ease,box-shadow 220ms ease;
}
.card:hover{transform:translateY(-2px);box-shadow:var(--shadow-panel-hover)}
.badge,.tag{
  display:inline-flex;
  min-height:26px;
  max-width:100%;
  align-items:center;
  gap:7px;
  padding:4px 9px;
  overflow:hidden;
  border:1px solid var(--color-border);
  border-radius:var(--radius-small);
  background:var(--color-panel-strong);
  color:var(--color-text);
  font-size:12px;
  font-weight:700;
  line-height:1.25;
  text-overflow:ellipsis;
}
.badge--accent{border-color:var(--color-accent);background:var(--color-accent);color:var(--color-panel)}
.badge--success{border-color:var(--color-success);color:var(--color-success)}
.status-dot{
  width:8px;
  height:8px;
  flex-shrink:0;
  border-radius:50%;
  background:var(--color-success);
}
.reveal{
  opacity:1;
  transform:none;
  transition:opacity var(--transition-reveal),transform var(--transition-reveal);
}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.topbar{
  position:relative;
  z-index:50;
  height:var(--header-height);
  border-bottom:1px solid var(--color-border);
  background:var(--color-bg);
}
.topbar__inner{
  height:100%;
  display:flex;
  align-items:center;
  gap:28px;
}
.brand{
  display:inline-flex;
  min-height:44px;
  align-items:center;
  gap:10px;
  flex:none;
}
.brand__logo{width:26px;height:26px;flex-shrink:0}
.brand__word{
  font-family:var(--font-display);
  font-size:19px;
  font-weight:900;
  letter-spacing:-.01em;
}
.brand__local{color:var(--color-text-muted);font-size:14px;font-weight:600}
.desktop-nav{
  display:flex;
  height:var(--header-height);
  align-items:stretch;
  gap:2px;
  margin-left:auto;
}
.desktop-nav a{
  position:relative;
  display:inline-flex;
  min-height:44px;
  align-items:center;
  justify-content:center;
  padding-inline:11px;
  color:var(--color-text-muted);
  font-size:14px;
  font-weight:550;
  white-space:nowrap;
}
.desktop-nav a:hover,.desktop-nav a[aria-current="page"]{color:var(--color-text)}
.desktop-nav a[aria-current="page"]{font-weight:750}
.desktop-nav a[aria-current="page"]::after{
  position:absolute;
  right:11px;
  bottom:-1px;
  left:11px;
  height:2px;
  border-radius:1px;
  background:var(--color-accent);
  content:"";
}
.header-tools{
  display:flex;
  align-items:center;
  gap:10px;
  flex:none;
}
.lang-picker{position:relative}
.lang-button{
  display:inline-flex;
  min-width:44px;
  min-height:44px;
  align-items:center;
  justify-content:center;
  gap:6px;
  padding:6px 4px;
  border:0;
  background:transparent;
  color:var(--color-text-muted);
  font-size:13px;
}
.lang-button svg{width:10px;height:10px;flex-shrink:0}
.lang-menu{
  position:absolute;
  top:calc(100% + 8px);
  right:0;
  z-index:60;
  display:none;
  width:156px;
  padding:6px;
  border:1px solid var(--color-border);
  border-radius:var(--radius-medium);
  background:var(--color-panel);
  box-shadow:var(--shadow-panel-hover);
}
.lang-picker.is-open .lang-menu{display:block}
.lang-menu a{
  display:flex;
  min-height:40px;
  align-items:center;
  padding:8px 10px;
  border-radius:var(--radius-small);
  font-size:13px;
}
.lang-menu a:hover,.lang-menu a[aria-current="true"]{background:var(--color-panel-strong)}
.login-link{
  display:inline-flex;
  min-height:36px;
  align-items:center;
  justify-content:center;
  padding:7px 16px;
  border:1.5px solid var(--color-text);
  border-radius:var(--radius-small);
  font-size:13.5px;
  font-weight:700;
}
.login-link:hover{background:var(--color-text);color:var(--color-panel)}
.menu-toggle{
  display:none;
  min-width:44px;
  min-height:44px;
  align-items:center;
  justify-content:center;
  padding:0;
  border:0;
  background:transparent;
}
.menu-toggle svg{width:22px;height:22px}
.mobile-nav{
  position:absolute;
  top:var(--header-height);
  right:0;
  left:0;
  z-index:55;
  display:none;
  max-height:calc(100dvh - var(--header-height));
  overflow-y:auto;
  overscroll-behavior:contain;
  padding:10px var(--gutter) 18px;
  border-bottom:1px solid var(--color-border);
  background:var(--color-panel);
  box-shadow:var(--shadow-panel-hover);
}
.mobile-nav.is-open{display:block}
.mobile-nav a{
  display:flex;
  width:100%;
  min-height:48px;
  align-items:center;
  padding:11px 8px;
  border-bottom:1px solid var(--color-border);
  color:var(--color-text);
  font-weight:650;
}
.mobile-nav a[aria-current="page"]{color:var(--color-accent)}
.mobile-nav__languages{padding-top:10px}
.mobile-nav__languages strong{display:block;padding:8px;color:var(--color-text-muted);font-size:12px}
.mobile-nav__languages a{font-weight:500}
.nav-veil{
  position:fixed;
  inset:var(--header-height) 0 0;
  z-index:40;
  display:none;
  border:0;
  background:rgba(23,26,43,.28);
}
.nav-veil.is-open{display:block}
.site-footer{
  overflow-x:clip;
  border-top:1px solid var(--color-border);
  background:var(--color-ink);
  color:var(--color-lane);
}
.footer-main{
  display:grid;
  grid-template-columns:minmax(240px,1.4fr) repeat(3,minmax(150px,1fr));
  gap:48px;
  padding-top:64px;
  padding-bottom:52px;
}
.footer-brand p{max-width:430px;color:var(--color-lane-muted)}
.footer-brand .brand__word{color:var(--color-panel)}
.footer-title{
  margin:0 0 14px;
  color:var(--color-panel);
  font-size:13px;
  font-weight:800;
  letter-spacing:.05em;
}
.footer-links{list-style:none}
.footer-links li+li{margin-top:7px}
.footer-links a{
  display:inline-flex;
  min-height:28px;
  align-items:center;
  color:var(--color-lane);
  font-size:13px;
}
.footer-links a:hover{color:var(--color-panel)}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:16px;
  padding-top:20px;
  padding-bottom:24px;
  border-top:1px solid var(--color-lane-muted);
  color:var(--color-lane-muted);
  font-family:var(--font-mono);
  font-size:11px;
}
.footer-legal{display:flex;flex-wrap:wrap;gap:18px}
.footer-legal a{min-height:24px}
.ticker-shell{
  max-width:100%;
  overflow:hidden;
  border-block:1px solid var(--color-border);
  background:var(--color-panel-strong);
}
.ticker-track{
  display:flex;
  width:max-content;
  align-items:center;
  will-change:transform;
}
.ticker-group{
  display:flex;
  flex:none;
  align-items:center;
  gap:34px;
  padding:15px 17px;
  color:var(--color-text-muted);
  font-family:var(--font-mono);
  font-size:12px;
  white-space:nowrap;
}
.ticker-group span{display:inline-flex;align-items:center;gap:10px}
.ticker-group span::before{width:6px;height:6px;border-radius:50%;background:var(--color-accent);content:""}
.ticker-static{color:var(--color-text-muted)}
body:has(.toc-tabs) section[id]{scroll-margin-top:var(--toc-offset)}
@media (max-width:1120px){
  .desktop-nav a{padding-inline:8px;font-size:13px}
  .desktop-nav a[aria-current="page"]::after{right:8px;left:8px}
  .topbar__inner{gap:14px}
}
@media (max-width:900px){
  .desktop-nav,.header-tools>.lang-picker{display:none}
  .header-tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .footer-main{grid-template-columns:1fr 1fr}
}
@media (max-width:768px){
  h1{font-size:clamp(28px,9.7vw,40px);line-height:1.12;letter-spacing:-.01em}
  h2{font-size:clamp(28px,8vw,38px)}
  .section{padding-top:64px;padding-bottom:64px}
  .lead{font-size:17px}
  .ticker-track{width:100%;transform:none!important;will-change:auto}
  .ticker-group{width:100%;flex-wrap:wrap;white-space:normal}
  .ticker-group+.ticker-group{display:none}
}
@media (max-width:640px){
  .tilt,.tilt-left,.tilt-right{transform:none!important}
  .footer-main{grid-template-columns:1fr;gap:32px}
  .footer-bottom{display:block}
  .footer-legal{margin-top:14px}
  .button-row .btn{width:100%}
  .brand__local{display:none}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{scroll-behavior:auto!important;transition-duration:0s!important;animation-duration:0s!important;animation-iteration-count:1!important}
  .reveal,.reveal.pending,.reveal.shown{opacity:1!important;transform:none!important}
  .ticker-track{transform:none!important;will-change:auto}
}