:root {
  --bg:#E6F0F2;
  --hero-top:#EFF6F7;
  --hero-bottom:#DFEBEE;
  --panel:#F7FBFB;
  --panel-2:#D7E6E9;
  --border:#C5D6DB;
  --surface:#FFFFFF;
  --surface-rgb:255,255,255;
  --accent:#2C4FC4;
  --accent-dark:#1F3A99;
  --accent-rgb:44,79,196;
  --accent-soft:rgba(44,79,196,.12);
  --text:#1B2431;
  --ink-rgb:27,36,49;
  --muted:#566273;
  --success:#1F8A5B;
  --success-soft:rgba(31,138,91,.16);
  --warn:#B7791F;
  --warn-soft:rgba(183,121,31,.18);
  --error:#C8362E;
  --marker:#FFD84D;
  --marker-edge:#F4C93A;
  --chrome-dot:#BCCBD1;
  --flag-red:#D52B1E;
  --flag-navy:#1D2C6B;
  --flag-white:#FFFFFF;
  --clear:transparent;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei","Malgun Gothic",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei","Malgun Gothic",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-sm:6px;
  --r-md:8px;
  --r-lg:10px;
  --r-back:12px;
  --r-marker:3px;
  --r-chip:5px;
  --r-pill:999px;
  --r-circle:50%;
  --gutter:56px;
  --content-width:1440px;
  --header-height:68px;
  --anchor-offset:84px;
  --toc-offset:144px;
  --shadow-panel:inset 0 0 0 1px rgba(255,255,255,.92),0 36px 80px -24px rgba(44,79,196,.12),0 6px 18px -6px rgba(44,79,196,.12);
  --shadow-small:0 10px 24px -14px rgba(44,79,196,.24);
  --ease-out:cubic-bezier(.2,.65,.3,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:17px;line-height:1.75;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
h1,h2,h3,h4,p,figure,blockquote{margin:0}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;text-wrap:balance}
h1{font-size:clamp(52px,4.45vw,64px);line-height:1.1;letter-spacing:-.02em}
h2{font-size:32px;line-height:1.3;letter-spacing:-.02em}
h3{font-size:22px;line-height:1.4}
a{color:var(--accent);text-underline-offset:4px}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
img,video{max-width:100%;height:auto}
svg{flex-shrink:0}
ul{list-style:none;margin:0;padding:0}
ol{padding-left:1.5em}
button,a,summary,input,select,textarea{-webkit-tap-highlight-color:var(--accent-soft)}
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
[hidden]{display:none!important}
:where(main,section,article,aside,nav,div){min-width:0}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:64px;padding-bottom:64px}
.section-heading{margin-bottom:24px}
.stack{display:grid;gap:24px}
.grid-three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.grid-five{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:16px}
.no-break{white-space:nowrap}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.panel{padding:24px;border:1px solid var(--border);border-radius:var(--r-lg);background:var(--panel);box-shadow:var(--shadow-small)}
.prose{max-width:52rem;overflow-wrap:break-word}
.prose p+p,.prose p+ul,.prose p+ol{margin-top:20px}
.prose ul{list-style:disc;padding-left:1.4em}
.prose h2{margin-top:48px;margin-bottom:20px}
.prose h3{margin-top:28px;margin-bottom:12px}
code{font-family:var(--font-mono);font-size:.88em;overflow-wrap:anywhere;background:var(--panel-2);border-radius:var(--r-marker);padding:.12em .28em}
pre{max-width:100%;overflow-x:auto;padding:20px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--panel)}
pre code{padding:0;background:var(--clear);white-space:pre;overflow-wrap:normal}
.decorated-section{position:relative;overflow-x:clip;max-width:100%}
#server-status{position:relative;display:block;min-height:120px;max-width:100%;overflow:hidden;margin-block:24px}
#server-status+*{margin-top:24px}
.hl{font-weight:700;background:linear-gradient(var(--clear) 14%,var(--marker) 14%,var(--marker) 90%,var(--clear) 90%);padding:0 .22em;margin:0 .04em;border-radius:var(--r-marker);-webkit-box-decoration-break:clone;box-decoration-break:clone}
.hl-line{color:var(--text);background:linear-gradient(var(--clear) 64%,var(--marker) 64%,var(--marker) 94%,var(--clear) 94%);padding:0 .12em}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:50px;padding:10px 26px;border:0;border-radius:var(--r-pill);font-size:16px;font-weight:700;text-decoration:none;line-height:1.5;flex-shrink:0;white-space:nowrap;transition:transform .15s ease,box-shadow .15s ease}
.btn--primary,.btn-primary{color:var(--surface);background:linear-gradient(180deg,var(--accent),var(--accent-dark));box-shadow:inset 0 1px 0 rgba(var(--surface-rgb),.28),0 12px 26px -10px rgba(var(--accent-rgb),.6)}
.btn--primary:hover,.btn-primary:hover{transform:translateY(-1px);box-shadow:inset 0 1px 0 rgba(var(--surface-rgb),.28),0 16px 30px -10px rgba(var(--accent-rgb),.7)}
.btn--ghost{color:var(--accent-dark);background:rgba(var(--surface-rgb),.62);box-shadow:inset 0 0 0 1.5px rgba(var(--accent-rgb),.42)}
.btn--ghost:hover{box-shadow:inset 0 0 0 1.5px var(--accent)}
.btn:active{transform:translateY(0)}
.btn:disabled,.btn[aria-disabled="true"]{color:var(--muted);background:var(--panel-2);box-shadow:none}
.btn[aria-disabled="true"]{pointer-events:none}
.btn svg{width:16px;height:16px}
.masthead{position:relative;z-index:30}
.masthead__in{display:flex;align-items:center;gap:28px;height:var(--header-height);flex-wrap:nowrap}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);flex:none;min-height:32px}
.brand img{width:32px;height:32px;display:block;filter:drop-shadow(0 4px 8px rgba(var(--accent-rgb),.22))}
.brand__word{font-family:var(--font-display);font-weight:800;font-size:19px;letter-spacing:-.02em;white-space:nowrap}
.primary{margin-inline:auto;flex:1;min-width:0}
.primary ul{display:flex;align-items:center;justify-content:center;list-style:none;margin:0;padding:0;gap:0}
.primary li{display:flex;align-items:center;font-size:14.5px;line-height:1}
.primary li+li::before{content:"·";color:var(--muted);opacity:.55;margin:0 11px;font-weight:700}
.primary a{text-decoration:none;color:var(--text);padding:6px 1px;min-height:24px;white-space:nowrap;transition:color .15s ease}
.primary a:hover{color:var(--accent)}
.primary a[aria-current="page"]{color:var(--accent);font-weight:700;text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:7px}
.tools{display:flex;align-items:center;gap:10px;flex-shrink:0}
.language{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:5px;min-height:32px;width:auto;border:0;background:var(--clear);color:var(--muted);font-size:14px;padding:6px 8px;border-radius:var(--r-sm);white-space:nowrap}
.lang span{white-space:nowrap}
.lang:hover{color:var(--text);background:rgba(var(--surface-rgb),.6)}
.language-panel{position:absolute;right:0;top:calc(100% + 8px);z-index:70;min-width:176px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-panel)}
.language-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;text-decoration:none;color:var(--text);border-radius:var(--r-sm)}
.language-panel a:hover,.language-panel a[aria-current="true"]{background:var(--accent-soft);color:var(--accent-dark)}
.nav-pill{display:inline-flex;align-items:center;justify-content:center;height:38px;padding:0 18px;border-radius:var(--r-pill);font-size:14px;font-weight:700;color:var(--surface);text-decoration:none;white-space:nowrap;background:linear-gradient(180deg,var(--accent),var(--accent-dark));box-shadow:inset 0 1px 0 rgba(var(--surface-rgb),.25),0 6px 14px -6px rgba(var(--accent-rgb),.6)}
.nav-login{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:38px;padding:0 14px;border-radius:var(--r-md);font-size:14px;font-weight:700;color:var(--text);text-decoration:none;white-space:nowrap;background:var(--surface);border:1px solid var(--border);box-shadow:inset 0 -1px 0 rgba(var(--ink-rgb),.04)}
.nav-login svg{width:16px;height:16px;color:var(--accent-dark)}
.nav-login:hover{border-color:rgba(var(--accent-rgb),.5)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:10px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--panel);color:var(--accent-dark)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-pill)}
.mobile-drawer{position:fixed;z-index:50;top:var(--header-height);left:0;right:0;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);padding:16px var(--gutter) 32px;border-top:1px solid var(--border)}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:10px 12px;text-decoration:none;color:var(--text);border-bottom:1px solid var(--border)}
.mobile-drawer a[aria-current]{color:var(--accent-dark);background:var(--accent-soft);font-weight:700}
.drawer-languages{margin-top:20px}
.nav-veil{position:fixed;z-index:40;inset:var(--header-height) 0 0;background:rgba(var(--ink-rgb),.22);border:0}
html.nav-open{overflow:hidden}
.site-footer{border-top:1px solid var(--border);background:var(--panel-2);padding-top:48px;padding-bottom:28px;box-shadow:inset 0 1px 0 rgba(var(--surface-rgb),.65)}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:40px}
.footer-brand p{margin-top:16px;max-width:30em;color:var(--muted);font-size:15px}
.footer-heading{font-size:15px;font-weight:800;margin-bottom:12px}
.footer-links{display:flex;flex-wrap:wrap;gap:8px 18px}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;font-size:14px;color:var(--accent-dark)}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;padding-top:28px}
.footer-languages a{display:inline-flex;align-items:center;min-height:28px;font-size:14px;color:var(--text)}
.footer-languages a[aria-current="true"]{font-weight:700;text-decoration-thickness:2px}
.footer-bottom{margin-top:24px;padding-top:20px;border-top:1px solid var(--border);display:flex;flex-wrap:wrap;gap:12px 24px;align-items:center;font-size:13px;color:var(--muted)}
.footer-bottom a{display:inline-flex;align-items:center;min-height:24px;color:var(--text)}
.reveal{transition:opacity .35s var(--ease-out),transform .35s var(--ease-out)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
@media(max-width:1300px){
  .masthead__in{gap:18px}
  .primary li{font-size:13.5px}
  .primary li+li::before{margin:0 7px}
}
@media(max-width:1180px){
  .primary{display:none}
  .tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .masthead{z-index:60}
}
@media(max-width:768px){
  :root{--gutter:20px}
  h1{font-size:40px}
  h2{font-size:26px}
  .section{padding-top:40px;padding-bottom:40px}
  .grid-three{grid-template-columns:minmax(0,1fr)}
  .grid-five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:28px}
  .tools{margin-left:auto;gap:6px}
  .tools>.nav-pill{display:none}
  .masthead__in{gap:10px}
  .brand{gap:7px}
  .brand__word{font-size:17px}
  .brand img{width:28px;height:28px}
  .lang{font-size:12px;padding-inline:5px}
  .nav-login{font-size:13px;padding-inline:10px}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,.note,.sign{transform:none}
  .decorated-section{max-width:100%;overflow-x:clip}
}
@media(max-width:360px){
  :root{--gutter:16px}
  .masthead__in{gap:6px}
  .brand__word{font-size:15px}
  .brand img{width:24px;height:24px}
  .tools{gap:3px}
  .nav-login{padding-inline:8px}
  .nav-login svg{display:none}
  .lang{font-size:11px;padding-inline:3px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}