:root{
  --bg:#FAF3E5;
  --bg-panel:#FFFCF6;
  --bg-panel-2:#F1E7D3;
  --border:#E3D5BC;
  --line-soft:#EEE3CF;
  --accent:#2160C4;
  --accent-dark:#17479A;
  --text:#2B2117;
  --text-muted:#75675A;
  --success:#3E8C5A;
  --warn:#C9822B;
  --error:#C2432F;
  --apricot:#E8954A;
  --apricot-ink:#9A5419;
  --sage-ink:#2F6B45;
  --hero-top:#FCF7EC;
  --hero-bottom:#F3E8D4;
  --apricot-wash:#FCEEDB;
  --on-accent:#FFFCF6;
  --clear:transparent;
  --accent-06:rgba(33,96,196,.06);
  --accent-08:rgba(33,96,196,.08);
  --accent-10:rgba(33,96,196,.10);
  --accent-12:rgba(33,96,196,.12);
  --accent-glow:rgba(33,96,196,.36);
  --apricot-10:rgba(232,149,74,.10);
  --apricot-16:rgba(232,149,74,.16);
  --apricot-20:rgba(232,149,74,.20);
  --apricot-edge:rgba(232,149,74,.32);
  --sage-14:rgba(62,140,90,.14);
  --ink-04:rgba(43,33,23,.04);
  --ink-06:rgba(43,33,23,.06);
  --ink-10:rgba(43,33,23,.10);
  --hi-line:rgba(255,255,255,.85);
  --hi-faint:rgba(255,255,255,.22);
  --glass:rgba(255,252,246,.72);
  --shadow-blue:rgba(33,96,196,.10);
  --shadow-blue-lg:rgba(33,96,196,.14);
  --shadow-apricot:rgba(201,130,43,.18);
  --shadow-brown:rgba(92,62,32,.06);
  --shadow-brown-md:rgba(92,62,32,.12);
  --shadow-ink:rgba(43,33,23,.34);
  --veil:rgba(43,33,23,.34);
  --light-red:#EC6A5E;
  --light-yellow:#F4BF4F;
  --light-green:#61C554;
  --light-edge:rgba(43,33,23,.14);
  --flag-red:#C8102E;
  --flag-white:#FFFDF8;
  --flag-blue:#21468B;
  --flag-navy:#2B3A7E;
  --flag-black:#221C17;
  --flag-gold:#F1BF2B;
  --flag-edge:rgba(43,33,23,.14);
  --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;
  --r-xs:6px;
  --r-sm:8px;
  --r-md:10px;
  --r-card:12px;
  --r-lg:14px;
  --r-feature:24px;
  --r-pill:999px;
  --r-round:50%;
  --r-flag:3px;
  --r-route:9px;
  --r-location:7px;
  --gutter:24px;
  --content-width:1200px;
  --reading-width:800px;
  --header-height:64px;
  --anchor-offset:80px;
  --toc-offset:144px;
  --space-1:4px;
  --space-2:8px;
  --space-3:12px;
  --space-4:16px;
  --space-5:24px;
  --space-6:32px;
  --space-7:48px;
  --space-8:64px;
  --space-9:88px;
  --shadow-panel:0 18px 44px -24px var(--shadow-blue),0 10px 26px -18px var(--shadow-brown-md);
  --grain:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180'><filter id='g'><feTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 .17 0 0 0 0 .13 0 0 0 0 .09 .07 0 0 0 0'/></filter><rect width='100%' height='100%' filter='url(%23g)'/></svg>");
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
body{margin:0;font-family:var(--font-body);font-size:16px;line-height:1.75;color:var(--text);background-color:var(--bg);background-image:var(--grain);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
[hidden]{display:none!important}
a{color:var(--accent-dark);text-underline-offset:4px}
img{max-width:100%;height:auto}
svg{flex-shrink:0;vertical-align:middle}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
button,a,input,summary,select,textarea{-webkit-tap-highlight-color:var(--accent-10)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-xs)}
p{margin:0 0 1em}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--text);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,5vw,68px);font-weight:800;line-height:1.12;letter-spacing:-.02em;margin:0 0 24px}
h2{font-size:clamp(28px,3vw,40px);line-height:1.25;letter-spacing:-.02em;margin:0 0 24px}
h3{font-size:23px;line-height:1.4;letter-spacing:-.01em;margin:0 0 12px}
h4{font-size:18px;margin:0 0 8px}
ul,ol{padding-inline-start:24px}
li+li{margin-top:6px}
code{font-family:var(--font-mono);font-size:.88em;overflow-wrap:anywhere;background:var(--ink-04);border-radius:var(--r-xs);padding:2px 5px}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--bg-panel-2);border:1px solid var(--border);border-radius:var(--r-card);line-height:1.65}
pre code{padding:0;background:var(--clear);overflow-wrap:normal;white-space:pre}
blockquote{margin-inline:0}
hr{border:0;border-top:1px solid var(--border);margin-block:32px}
:where(.grid,.cards,.footer-grid)>*,:where(main,article,section,aside,nav){min-width:0}
.wrap{width:100%;max-width:calc(var(--content-width) + var(--gutter)*2);margin-inline:auto;padding-inline:var(--gutter)}
.shell{width:min(1200px,100% - 48px);margin-inline:auto}
.reading-wrap{max-width:calc(var(--reading-width) + var(--gutter)*2);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:var(--space-8);padding-bottom:var(--space-8)}
.section-head{max-width:780px;margin-bottom:32px}
.section-head p,.muted{color:var(--text-muted)}
.center{text-align:center}
.mono{font-family:var(--font-mono);letter-spacing:-.01em;font-variant-numeric:tabular-nums}
.no-break{white-space:nowrap}
.ico{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex:none}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.panel,.card{padding:24px;border:1px solid var(--border);border-radius:var(--r-card);background:var(--bg-panel);box-shadow:inset 0 1px 0 var(--hi-line),var(--shadow-panel)}
.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.flow>*+*{margin-top:24px}
.prose{overflow-wrap:break-word}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose li{padding-inline-start:4px}
.prose :where(p,li){line-height:1.9}
.decorated-section{position:relative;overflow-x:clip}
#server-status{position:relative;display:block;min-height:160px;max-width:100%;overflow:hidden;margin:24px 0}
#server-status+*{margin-top:24px}
.reveal{transition:opacity .35s ease,transform .35s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.btn,.btn-login{display:inline-flex;align-items:center;justify-content:center;text-decoration:none;white-space:nowrap;flex-shrink:0}
.btn{gap:8px;min-height:48px;padding:0 24px;border:0;border-radius:var(--r-md);font-size:16px;font-weight:600;transition:background-color .15s ease,box-shadow .15s ease}
.btn svg{width:18px;height:18px}
.btn--primary,.btn-primary{background:var(--accent);color:var(--on-accent);box-shadow:inset 0 1px 0 var(--hi-faint),0 0 0 1px var(--accent-dark),0 12px 26px -12px var(--accent-glow)}
.btn--primary:hover,.btn-primary:hover{background:var(--accent-dark)}
.btn--ghost,.btn-secondary{background:var(--bg-panel);color:var(--text);box-shadow:inset 0 1px 0 var(--hi-line),0 0 0 1px var(--border),0 6px 14px -10px var(--shadow-brown-md)}
.btn--ghost:hover,.btn-secondary:hover{background:var(--bg)}
.btn--ghost svg{color:var(--text-muted)}
.btn:active{box-shadow:inset 0 2px 5px var(--ink-10)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.55;pointer-events:none}
.btn--small{min-height:36px;padding:0 14px;font-size:14px}
.topbar{position:relative;z-index:50}
.topbar__row{display:flex;align-items:center;flex-wrap:nowrap;gap:28px;height:var(--header-height)}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;margin-right:auto;flex-shrink:0;color:var(--text)}
.brand img{display:block;width:34px;height:34px}
.brand__word{font-family:var(--font-display);font-weight:800;font-size:19px;letter-spacing:-.02em;color:var(--text);white-space:nowrap}
.brand__zh{font-weight:500;color:var(--text-muted)}
.mainnav{flex:1;min-width:0}
.mainnav ul{display:flex;align-items:center;justify-content:center;list-style:none;margin:0;padding:0;gap:2px}
.mainnav li{margin:0;flex-shrink:0}
.mainnav a{display:inline-flex;align-items:center;gap:6px;min-height:34px;padding:0 10px;border-radius:var(--r-sm);font-size:14px;color:var(--text-muted);text-decoration:none;white-space:nowrap;transition:color .15s ease,background-color .15s ease}
.mainnav .ico{width:15px;height:15px}
.mainnav a:hover{color:var(--text);background:var(--ink-04)}
.mainnav a[aria-current="page"]{color:var(--text);font-weight:600}
.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:6px;min-height:34px;min-width:44px;width:auto;padding:0 10px;border:0;background:var(--clear);border-radius:var(--r-sm);font-size:14px;color:var(--text-muted);cursor:pointer;text-decoration:none;white-space:nowrap}
.lang span{white-space:nowrap}
.lang:hover{color:var(--text);background:var(--ink-04)}
.lang-panel{position:absolute;top:calc(100% + 8px);right:0;z-index:80;min-width:172px;padding:6px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--bg-panel);box-shadow:var(--shadow-panel)}
.lang-panel a{display:flex;align-items:center;min-height:40px;padding:7px 12px;color:var(--text);font-size:14px;text-decoration:none;border-radius:var(--r-xs)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--accent-08);color:var(--accent-dark)}
.btn-login{min-height:34px;padding:0 16px;border-radius:var(--r-sm);background:var(--accent);color:var(--on-accent);font-size:14px;font-weight:600;box-shadow:inset 0 1px 0 var(--hi-faint),0 0 0 1px var(--accent-dark);transition:background-color .15s ease}
.btn-login:hover{background:var(--accent-dark)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:10px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--bg-panel);color:var(--text)}
.menu-toggle svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round}
.nav-drawer{position:fixed;top:var(--header-height);inset-inline:0;z-index:49;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;background:var(--bg-panel);padding:20px var(--gutter) 40px;border-top:1px solid var(--border)}
.nav-drawer ul{list-style:none;margin:0;padding:0}
.nav-drawer li{margin:0}
.nav-drawer a{display:flex;align-items:center;gap:12px;width:100%;min-height:46px;padding:10px 14px;border-radius:var(--r-sm);text-decoration:none;color:var(--text)}
.nav-drawer a:hover,.nav-drawer a[aria-current]{background:var(--accent-08);color:var(--accent-dark)}
.drawer-languages{margin-top:20px;padding-top:16px;border-top:1px solid var(--border)}
.nav-veil{position:fixed;inset:var(--header-height) 0 0;z-index:48;background:var(--veil);border:0}
html.nav-open{overflow:hidden}
.site-footer{padding-top:56px;padding-bottom:28px;border-top:1px solid var(--border);background:var(--bg-panel-2)}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:40px}
.footer-brand p{max-width:360px;color:var(--text-muted);font-size:14px;margin:18px 0 0}
.footer-title{font-size:14px;font-weight:700;margin:0 0 12px}
.footer-links{display:flex;flex-wrap:wrap;gap:4px 18px;list-style:none;margin:0;padding:0}
.footer-links li{margin:0}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:32px;font-size:13px;color:var(--text-muted);text-decoration:none}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--accent-dark);text-decoration:underline}
.footer-languages{display:flex;flex-wrap:wrap;gap:6px 20px;margin-top:32px;padding-top:20px;border-top:1px solid var(--border)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;margin-top:20px;font-size:12px;color:var(--text-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
@media(max-width:1180px){
  .topbar__row{gap:16px}
  .mainnav a{padding:0 7px}
}
@media(max-width:1100px){
  .mainnav{display:none}
  .tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .topbar__row{gap:12px}
}
@media(min-width:1101px){
  .nav-drawer,.nav-veil{display:none!important}
}
@media(max-width:768px){
  :root{--gutter:16px}
  h1{font-size:36px;line-height:1.15}
  h2{font-size:28px}
  .shell{width:min(1200px,100% - 32px)}
  .lang span{display:none}
  .grid{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:28px}
  .sec{padding-top:48px;padding-bottom:48px}
  .btn{min-height:46px;padding:0 20px}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  .decorated-section{max-width:100%}
  .topbar__row{gap:8px}
  .tools{gap:4px;margin-left:auto}
  .brand{gap:6px}
  .brand img{width:28px;height:28px}
  .brand__word{font-size:17px}
  .btn-login{padding:0 12px}
  .lang{padding:0 6px}
  h1{font-size:32px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}