:root {
  color-scheme: light;
  --c-bg:#F6F9F8;
  --c-panel:#FFFFFF;
  --c-panel-2:#EDF2F1;
  --c-side:#F4F8F7;
  --c-chrome:#FAFCFB;
  --c-border:#DCE4E2;
  --c-border-strong:#CAD5D2;
  --c-accent:#1B8C4E;
  --c-accent-dark:#126B3A;
  --c-text:#1E2422;
  --c-muted:#5E6B67;
  --c-faint:#8B9894;
  --c-success:#2F9E5C;
  --c-warn:#C98A14;
  --c-error:#C8413A;
  --c-ink:#19211E;
  --c-on-accent:#FFFFFF;
  --c-hero-top:#F9FBFB;
  --c-hero-bottom:#EEF4F2;
  --c-teal-gray:#D3E1E0;
  --c-glow-mint:rgba(56,188,168,.06);
  --c-glow-leaf:rgba(88,190,112,.04);
  --c-a06:rgba(27,140,78,.06);
  --c-a08:rgba(27,140,78,.08);
  --c-a10:rgba(27,140,78,.10);
  --c-a14:rgba(27,140,78,.14);
  --c-a18:rgba(27,140,78,.18);
  --c-a28:rgba(27,140,78,.28);
  --c-white-92:rgba(255,255,255,.92);
  --c-white-70:rgba(255,255,255,.70);
  --c-white-55:rgba(255,255,255,.55);
  --c-white-40:rgba(255,255,255,.40);
  --c-white-18:rgba(255,255,255,.18);
  --c-glass:rgba(255,255,255,.66);
  --c-text-72:rgba(30,36,34,.72);
  --c-veil:rgba(25,33,30,.28);
  --flag-red:#D33A3F;
  --flag-white:#FFFFFF;
  --flag-blue:#2C3E87;
  --flag-green:#2D8F57;
  --flag-edge:rgba(30,36,34,.14);
  --shadow-win:0 2px 6px rgba(27,140,78,.05),0 28px 60px -8px rgba(27,140,78,.10);
  --shadow-float:0 4px 12px rgba(27,140,78,.08),0 26px 52px -10px rgba(27,140,78,.18);
  --shadow-cta:0 12px 26px -10px rgba(27,140,78,.55);
  --shadow-soft:0 1px 2px rgba(27,140,78,.06),0 6px 16px -6px rgba(27,140,78,.10);
  --shadow-ink:0 6px 14px -6px rgba(25,33,30,.45);
  --r-xs:5px;
  --r-sm:8px;
  --r-md:10px;
  --r-lg:12px;
  --r-xl:16px;
  --r-check:4px;
  --r-icon:6px;
  --r-control:14px;
  --r-control-button:9px;
  --r-line:2px;
  --r-round:50%;
  --r-pill:999px;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --text-xs:12px;
  --text-sm:14px;
  --text-base:16px;
  --text-lede:18px;
  --title-large:clamp(52px,4.5vw,66px);
  --title-section:clamp(28px,3.2vw,44px);
  --title-card:22px;
  --weight-body:400;
  --weight-medium:500;
  --weight-bold:600;
  --weight-heading:800;
  --gutter:48px;
  --nav-h:72px;
  --anchor-gap:88px;
  --toc-gap:156px;
  --content-max:1408px;
  --reading-max:820px;
  --motion-fast:.2s;
  --motion-reveal:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-gap);scroll-behavior:smooth}
body{margin:0;background:var(--c-bg);color:var(--c-text);font:var(--weight-body) var(--text-base)/1.6 var(--font-body);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
img,svg{vertical-align:middle}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button,a,summary{-webkit-tap-highlight-color:var(--c-a10)}
a{color:inherit;text-underline-offset:.2em}
a:hover{color:var(--c-accent-dark)}
button{border:1px solid var(--c-border);background:var(--c-panel)}
button:disabled{cursor:not-allowed;opacity:.55}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--c-accent);outline-offset:3px}
[hidden]{display:none!important}
h1,h2,h3,h4{font-family:var(--font-display);line-height:1.2;text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--title-large);font-weight:var(--weight-heading);letter-spacing:-.02em}
h2{font-size:var(--title-section);font-weight:var(--weight-heading);letter-spacing:-.02em}
h3{font-size:var(--title-card);font-weight:700}
p{margin:0 0 1em}
h1,h2,h3{margin-top:0}
li+li{margin-top:0}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;border:1px solid var(--c-border);border-radius:var(--r-md);background:var(--c-panel-2)}
pre code{overflow-wrap:normal;white-space:pre}
blockquote{margin-inline:0}
.shell,.wrap{width:100%;max-width:var(--content-max);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:calc(var(--reading-max) + var(--gutter)*2);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:88px;padding-bottom:88px}
.section-head{max-width:760px;margin:0 auto 40px;text-align:center}
.section-head p,.muted{color:var(--c-muted)}
.grid{display:grid;gap:24px}
.grid>*,:where(.shell,.wrap,.reading-wrap)>*,.hero-copy,.stage{min-width:0}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-five{grid-template-columns:repeat(5,minmax(0,1fr))}
.panel,.card{padding:24px;background:var(--c-panel);border:1px solid var(--c-border);border-radius:var(--r-lg);box-shadow:var(--shadow-soft)}
.mono{font-family:var(--font-mono)}
.no-break{white-space:nowrap}
.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}
.prose{overflow-wrap:break-word}
.prose p,.prose li{line-height:1.85}
.prose h2{margin-top:56px}
.prose h3{margin-top:32px}
.prose a{color:var(--c-accent-dark)}
.prose ul,.prose ol{padding-left:1.5em}
.prose img{border-radius:var(--r-md)}
.reveal{transition:opacity var(--motion-reveal) ease,transform var(--motion-reveal) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-height:80px;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status+*{margin-top:32px}
#server-status :where(.grid,ul){max-width:100%;min-width:0}
.counter-value{display:inline-block;min-width:3ch;font-family:var(--font-mono);font-variant-numeric:tabular-nums;text-align:end}
.counter-value[data-count="7"]{min-width:1ch}
.topbar{position:relative;z-index:70;height:var(--nav-h)}
.topbar>.shell{height:100%;display:flex;align-items:center;flex-wrap:nowrap;gap:0}
#site-header{position:relative;z-index:70;min-height:var(--nav-h)}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;text-decoration:none;color:var(--c-text)}
.brand img{display:block;width:32px;height:32px;flex-shrink:0}
.brand-word{font-family:var(--font-display);font-weight:800;font-size:19px;letter-spacing:-.02em;line-height:1}
.brand-zh{font-size:var(--text-sm);font-weight:var(--weight-medium);color:var(--c-muted)}
.desktop-nav{flex:1;min-width:0;margin-left:44px}
.nav-list{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:0}
.nav-list li{display:flex;align-items:center;flex-shrink:0}
.nav-list li+li::before{content:"·";color:var(--c-faint);margin:0 12px;font-weight:700}
.nav-list a{display:inline-flex;align-items:center;min-height:32px;text-decoration:none;color:var(--c-muted);font-size:14.5px;font-weight:500;transition:color var(--motion-fast)}
.nav-list a:hover,.nav-list a[aria-current="page"]{color:var(--c-text)}
.nav-list a[aria-current="page"]{font-weight:600}
.nav-tools{margin-left:auto;display:flex;align-items:center;gap:8px;flex-shrink:0}
.lang-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;height:40px;padding:0 12px;border:0;background:transparent;border-radius:var(--r-sm);font:500 14px/1 var(--font-body);color:var(--c-muted);cursor:pointer;white-space:nowrap}
.lang span{white-space:nowrap}
.lang:hover{color:var(--c-text);background:var(--c-white-55)}
.lang svg{display:block}
.language-menu{display:none;position:absolute;right:0;top:calc(100% + 8px);z-index:90;min-width:176px;padding:8px;border:1px solid var(--c-border);border-radius:var(--r-md);background:var(--c-panel);box-shadow:var(--shadow-float)}
.language-menu.is-open{display:block}
.language-menu a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-sm);text-decoration:none;font-size:var(--text-sm);white-space:nowrap}
.language-menu a:hover,.language-menu a[aria-current="true"]{background:var(--c-panel-2);color:var(--c-text)}
.login{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:40px;padding:0 18px;border:1px solid var(--c-border-strong);border-radius:var(--r-md);background:var(--c-panel);color:var(--c-text);text-decoration:none;font:600 14.5px/1 var(--font-body);box-shadow:var(--shadow-soft);white-space:nowrap;transition:border-color var(--motion-fast),transform var(--motion-fast)}
.login:hover{border-color:var(--c-faint);transform:translateY(-1px)}
.login svg{display:block;color:var(--c-muted)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:10px;border-radius:var(--r-sm);background:var(--c-panel);color:var(--c-text)}
.menu-toggle svg{width:20px;height:20px;display:block}
.mobile-drawer{display:none;position:fixed;inset:var(--nav-h) 0 auto;z-index:65;height:calc(100dvh - var(--nav-h));max-height:calc(100dvh - var(--nav-h));padding:16px var(--gutter) 32px;background:var(--c-panel);overflow-y:auto;overscroll-behavior:contain;border-top:1px solid var(--c-border)}
.mobile-drawer.is-open{display:block}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 8px;text-decoration:none;border-bottom:1px solid var(--c-border);color:var(--c-text)}
.mobile-drawer a[aria-current="page"],.mobile-drawer a[aria-current="true"]{color:var(--c-accent-dark);font-weight:600;background:var(--c-a06)}
.drawer-languages{margin-top:24px}
.nav-veil{display:none;position:fixed;inset:var(--nav-h) 0 0;z-index:60;background:var(--c-veil);border:0}
.nav-veil.is-open{display:block}
html.nav-open{overflow:hidden}
.site-footer{border-top:1px solid var(--c-border);background:linear-gradient(180deg,var(--c-chrome),var(--c-panel-2));padding-top:56px;padding-bottom:32px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1.2fr 1fr;gap:40px}
.footer-brand p{max-width:27em;margin-top:18px;color:var(--c-muted);font-size:var(--text-sm)}
.footer-title{margin:0 0 14px;font-size:var(--text-sm);font-weight:600}
.footer-links{display:grid;gap:4px;list-style:none;padding:0;margin:0}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;font-size:var(--text-sm);color:var(--c-muted);text-decoration:none}
.footer-links a:hover{color:var(--c-accent-dark)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:40px;padding-top:24px;border-top:1px solid var(--c-border);font-size:var(--text-xs);color:var(--c-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.footer-legal a{display:inline-flex;align-items:center;min-height:24px}
@media(min-width:1101px) and (max-width:1279px){
  .desktop-nav{margin-left:24px}
  .nav-list li+li::before{margin-inline:8px}
  .nav-list a{font-size:13px}
  .lang{padding-inline:8px}
}
@media(max-width:1100px){
  .desktop-nav{display:none}
  .nav-tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(min-width:1101px){
  .mobile-drawer.is-open,.nav-veil.is-open{display:none}
}
@media(max-width:768px){
  :root{--gutter:24px;--title-large:clamp(28px,6vw,40px);--title-section:clamp(26px,5vw,34px)}
  .section{padding-top:56px;padding-bottom:56px}
  .grid-three{grid-template-columns:1fr}
  .grid-five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{gap:28px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  .first-screen,[data-hero-visual],.decorated-section{max-width:100%;overflow-x:clip}
  .brand{gap:7px}
  .brand img{width:28px;height:28px}
  .brand-word{font-size:16px}
  .brand-zh{display:none}
  .nav-tools{gap:4px;margin-left:auto}
  .lang{padding-inline:6px;font-size:12px;gap:4px}
  .lang svg{width:14px;height:14px}
  .login{min-height:38px;padding-inline:10px;font-size:13px}
  .login svg{display:none}
  .menu-toggle{padding:8px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:24px 16px}
  .footer-brand{grid-column:1/-1}
  .panel,.card{padding:20px}
}
@media(max-width:359px){
  .brand-word{font-size:14px}
  .brand img{width:24px;height:24px}
  .lang{font-size:11px;padding-inline:3px}
  .lang svg{display:none}
  .login{padding-inline:8px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}