:root{
  color-scheme:light;
  --bg:#F6F8FA;--panel:#FFFFFF;--panel-2:#EDF1F6;--border:#DDE3EC;--border-strong:#C9D2DE;
  --accent:#F2581F;--accent-dark:#C2410E;--accent-2:#F59A23;--accent-soft:#FDECE3;
  --text:#12151B;--text-muted:#5B6472;--text-faint:#7B8594;--white:#FFFFFF;
  --success:#1E9E57;--success-soft:#E2F3E9;--warn:#D98A0B;--error:#D92D3A;
  --sky:#BFDDFB;--sky-mid:#D3E7FC;--sky-low:#E8F2FC;--wall-1:#D6E7FA;--wall-2:#ECF4FD;--wall-3:#F8FBFE;--chrome:#F6F8FB;--cloud-base:#E8F1FB;
  --silver-1:#F2F4F7;--silver-2:#DCE1E7;--silver-3:#BCC4CE;--silver-edge:rgba(120,132,148,.38);--bezel:#14171D;--bezel-2:#262A32;--cam:#2E3A4A;
  --glass:rgba(255,255,255,.6);--glass-strong:rgba(255,255,255,.8);--glass-line:rgba(255,255,255,.92);--menubar:rgba(255,255,255,.55);--glare:rgba(255,255,255,.16);--cloud:rgba(255,255,255,.9);--clear:rgba(255,255,255,0);
  --win-line:rgba(18,21,27,.06);--sky-shadow-12:rgba(47,120,200,.12);--sky-shadow-14:rgba(47,120,200,.14);--sky-shadow-20:rgba(47,120,200,.2);--ink-shadow:rgba(18,21,27,.2);--ink-shadow-soft:rgba(18,21,27,.12);--veil:rgba(18,21,27,.32);
  --candy-blue:#E2F1FE;--candy-peach:#FBE9E0;--candy-mint:#E4F2EA;--candy-lilac:#EFEBF7;
  --fl-white:#FFFFFF;--fl-jp:#BC002D;--fl-us-red:#B22234;--fl-us-blue:#3C3B6E;--fl-sg:#EF3340;--fl-hk:#DE2910;--fl-nl-red:#AE1C28;--fl-nl-blue:#21468B;--fl-de-black:#1B1B1B;--fl-de-red:#DD0000;--fl-de-gold:#FFCE00;--fl-line:rgba(18,21,27,.12);
  --r-xs:6px;--r-sm:10px;--r-md:14px;--r-lg:20px;--r-xl:28px;--r-pill:999px;--r-round:50%;
  --font-display:"Inter","Noto Sans SC","Noto Sans JP","Noto Sans KR","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","Noto Sans JP","Noto Sans KR","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --gutter:24px;--content-width:1200px;--reading-width:800px;--header-height:68px;--anchor-offset:84px;--toc-offset:148px;
  --fs-body:16px;--fs-small:14px;--fs-h1:clamp(52px,3.2vw + 18px,66px);--fs-h2:clamp(28px,3vw,40px);--fs-h3:22px;
  --shadow-panel:0 24px 64px -28px var(--sky-shadow-12);--shadow-ink:0 14px 30px -14px var(--ink-shadow);
  --ease:cubic-bezier(.2,.65,.3,1);--time-fast:.2s;--time-reveal:.35s;
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
body{background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--fs-body);line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
button:disabled{cursor:not-allowed}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
ul{list-style:none}
h1,h2,h3,h4{font-family:var(--font-display);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--fs-h1);font-weight:800;line-height:1.12;letter-spacing:-.02em}
h2{font-size:var(--fs-h2);font-weight:800;line-height:1.25;letter-spacing:-.02em}
h3{font-size:var(--fs-h3);font-weight:700;line-height:1.4}
p{overflow-wrap:break-word}
code{font-family:var(--font-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:24px;border-radius:var(--r-md);background:var(--panel-2)}
pre code{overflow-wrap:normal;white-space:pre}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent-dark);outline-offset:3px}
:where(main,section,article,aside,div,nav,li){min-width:0}
.wrap{width:100%;max-width:calc(var(--content-width) + 2 * var(--gutter));padding-inline:var(--gutter);margin-inline:auto}
.reading-wrap{max-width:calc(var(--reading-width) + 2 * var(--gutter));margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:80px;padding-bottom:80px}
.section-head{max-width:800px;margin:0 auto 32px;text-align:center}
.section-head p{margin-top:16px;color:var(--text-muted)}
.stack>*+*{margin-top:24px}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.panel,.card{padding:28px;background:var(--panel);border-radius:var(--r-xl);box-shadow:inset 0 1px 0 var(--glass-line),var(--shadow-panel)}
.panel-inset{padding:24px;border-radius:var(--r-lg);background:var(--panel-2)}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.no-break{white-space:nowrap}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.prose{line-height:1.85}
.prose p,.prose ul,.prose ol,.prose pre,.prose table{margin-block:20px}
.prose h2{margin-top:56px;margin-bottom:20px}
.prose h3{margin-top:32px;margin-bottom:12px}
.prose ul{list-style:disc;padding-left:24px}
.prose ol{padding-left:28px}
.prose a:not(.btn){color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.prose code{padding:2px 5px;background:var(--panel-2);border-radius:var(--r-xs)}
.prose pre code{padding:0;background:inherit}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:52px;padding:0 30px;border-radius:var(--r-pill);font-size:16px;font-weight:600;letter-spacing:.01em;white-space:nowrap;flex-shrink:0;transition:background-color var(--time-fast),box-shadow var(--time-fast)}
.btn svg{width:16px;height:16px}
.btn-ink,.btn-primary{background:var(--text);color:var(--white);box-shadow:var(--shadow-ink)}
.btn-ink:hover,.btn-primary:hover{background:var(--bezel-2)}
.btn-line,.btn-secondary{background:var(--white);color:var(--text);box-shadow:inset 0 0 0 1.5px var(--text)}
.btn-line:hover,.btn-secondary:hover{background:var(--panel-2)}
.btn-small{min-height:40px;padding-inline:20px;font-size:14px}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--panel-2);color:var(--text-muted);box-shadow:none}
.btn-demo-hover{background:var(--bezel-2);color:var(--white)}
.btn-demo-focus{outline:2px solid var(--accent-dark);outline-offset:3px}
.topbar,#site-header{position:relative;z-index:100}
.topbar .wrap{display:flex;align-items:center;height:var(--header-height);gap:28px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;font-family:var(--font-display);font-size:19px;font-weight:800;letter-spacing:-.02em;white-space:nowrap}
.brand img{width:34px;height:34px}
.brand-zh{color:var(--text-muted);font-weight:500}
.desktop-nav{flex:1;min-width:0}
.tabs{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px}
.tab{position:relative;display:flex;align-items:center;justify-content:center;height:var(--header-height);padding:0 12px;font-size:15px;font-weight:500;color:var(--text-muted);white-space:nowrap;transition:color var(--time-fast)}
.tab::after{content:"";position:absolute;left:12px;right:12px;bottom:13px;height:3px;border-radius:var(--r-pill);background:var(--text);opacity:0;transform:scaleX(.4);transition:opacity var(--time-fast),transform var(--time-fast)}
.tab:hover{color:var(--text)}
.tab:hover::after{opacity:.25;transform:scaleX(1)}
.tab.is-current{color:var(--text);font-weight:600}
.tab.is-current::after{opacity:1;transform:scaleX(1)}
.bar-end{display:flex;align-items:center;gap:10px;margin-left:auto;flex-shrink:0}
.language-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;min-height:40px;width:auto;padding-inline:12px;border-radius:var(--r-pill);font-size:14px;font-weight:500;white-space:nowrap}
.lang:hover{background:var(--glass)}
.lang svg{width:16px;height:16px}
.lang-text{white-space:nowrap}
.lang-caret{font-size:11px;color:var(--text-muted)}
.language-menu{position:absolute;right:0;top:calc(100% + 8px);z-index:150;display:none;min-width:180px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-panel)}
.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)}
.language-menu a:hover,.language-menu a[aria-current]{background:var(--panel-2)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:0 22px;border-radius:var(--r-pill);background:var(--text);color:var(--white);font-size:14px;font-weight:600;white-space:nowrap;box-shadow:0 10px 22px -12px var(--ink-shadow)}
.btn-login:hover{background:var(--bezel-2)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:5px;min-width:44px;min-height:44px;border-radius:var(--r-sm)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.mobile-drawer{display:none;position:fixed;inset-inline:0;top:var(--header-height);height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;z-index:95;background:var(--panel);padding:16px var(--gutter) 40px}
.mobile-drawer.is-open{display:block}
#site-header{position:relative;z-index:110}
html.nav-open body .float-cta{display:none}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:8px 16px;line-height:1.4;border-radius:var(--r-sm)}
.mobile-drawer a:hover,.mobile-drawer a.is-current{background:var(--panel-2);color:var(--text)}
.drawer-languages{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));margin-top:20px;padding-top:20px;border-top:1px solid var(--border)}
.nav-veil{display:none;position:fixed;inset:var(--header-height) 0 0;z-index:90;background:var(--veil)}
.nav-veil.is-open{display:block}
html.nav-open{overflow:hidden}
.site-footer{background:var(--panel-2);border-top:1px solid var(--border);padding-top:56px;padding-bottom:32px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:48px}
.footer-brand p{max-width:340px;margin-top:20px;color:var(--text-muted);font-size:14px}
.footer-heading{font-size:14px;font-weight:700;margin-bottom:12px}
.footer-links{display:flex;flex-wrap:wrap;gap:4px 16px}
.footer-links a{display:inline-flex;align-items:center;min-height:32px;color:var(--text-muted);font-size:14px}
.footer-links a:hover{color:var(--text);text-decoration:underline;text-underline-offset:4px}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:32px}
.footer-languages a{display:inline-flex;align-items:center;min-height:32px;font-size:14px}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:24px;padding-top:24px;border-top:1px solid var(--border);font-size:13px;color:var(--text-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.footer-legal a{display:inline-flex;align-items:center;min-height:28px}
.reveal{transition:opacity var(--time-reveal) var(--ease),transform var(--time-reveal) var(--ease)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-height:120px;max-width:100%;overflow:hidden;margin-block:24px}
#server-status+*{margin-top:24px}
.decor-zone{position:relative;overflow-x:clip}
@media(min-width:1141px) and (max-width:1350px){
  .topbar .wrap{gap:16px}
  .tab{padding-inline:8px;font-size:14px}
  .tab::after{left:8px;right:8px}
  .lang{padding-inline:8px}
}
@media(max-width:1140px){
  .desktop-nav{display:none}
  .menu-toggle{display:inline-flex}
  .bar-end{margin-left:auto}
  .topbar .wrap{gap:12px}
}
@media(max-width:768px){
  h1{font-size:38px}
  .grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .section{padding-top:56px;padding-bottom:56px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:640px){
  :root{--gutter:16px;--fs-h2:28px}
  .no-break{white-space:normal}
  h1{font-size:34px}
  .grid{grid-template-columns:minmax(0,1fr)}
  .btn{min-height:48px;padding-inline:24px;font-size:15px}
  .btn-small{min-height:40px;padding-inline:18px;font-size:14px}
  .brand{gap:7px;font-size:17px}
  .brand img{width:30px;height:30px}
  .brand-zh{font-size:13px}
  .topbar .wrap{gap:8px}
  .bar-end{gap:4px;margin-left:auto}
  .lang{padding-inline:8px}
  .lang-text,.lang-caret{display:none}
  .btn-login{padding-inline:16px}
  .panel,.card{padding:22px}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:28px}
  .footer-brand{grid-column:auto}
  .tilt,[data-tilt]{transform:none}
  .decor-zone,.decor-zone>*{max-width:100%}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}