:root {
  --bg:#ECEFFA;
  --bg-panel:#F8F9FE;
  --bg-panel-2:#DFE4F5;
  --border:#D3D9EE;
  --accent:#3E9F63;
  --accent-dark:#17573A;
  --text:#151A33;
  --text-muted:#5A6180;
  --success:#23905A;
  --warn:#D98A1C;
  --error:#D2424B;
  --violet:#5B5FEF;
  --violet-soft:#E6E7FB;
  --announce:#E3E6FA;
  --hero-top:#F4F6FD;
  --hero-bottom:#E6EAF8;
  --white:#FFFFFF;
  --green-soft:#DDF1E4;
  --slot:#ECEEF6;
  --slot-strong:#E1E4F0;
  --line:#E6E9F4;
  --grid-line:rgba(21,26,51,.045);
  --mask-solid:#000000;
  --shadow-ink:rgba(21,26,51,.06);
  --shadow-ink-strong:rgba(21,26,51,.35);
  --shadow-violet:rgba(91,95,239,.12);
  --shadow-violet-float:rgba(91,95,239,.16);
  --halo:rgba(91,95,239,.16);
  --hi:rgba(255,255,255,.92);
  --on-dark-dot:rgba(255,255,255,.36);
  --on-dark-line:rgba(255,255,255,.22);
  --on-dark-grid:rgba(255,255,255,.12);
  --veil:rgba(21,26,51,.35);
  --flag-red:#C9444C;
  --flag-blue:#36468C;
  --flag-white:#FFFFFF;
  --flag-edge:rgba(21,26,51,.14);
  --transparent:transparent;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Microsoft YaHei",sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-xs:3px;
  --r-sm:6px;
  --r-badge:8px;
  --r-icon:9px;
  --r-float:10px;
  --r-inner:11px;
  --r-md:12px;
  --r-lg:20px;
  --r-pill:999px;
  --container:1200px;
  --gutter:24px;
  --section-space:80px;
  --shell-height:98px;
  --toc-height:64px;
  --anchor-space:88px;
  --shadow-window:0 1px 2px var(--shadow-ink),0 10px 24px -6px var(--shadow-violet),0 32px 72px -8px var(--shadow-violet);
  --shadow-float:0 1px 2px var(--shadow-ink),0 14px 34px -8px var(--shadow-violet-float);
  --focus-ring:2px solid var(--violet);
  --weight-regular:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --size-body:16px;
  --size-small:14px;
  --size-h1:clamp(52px,4.6vw,68px);
  --size-h2:40px;
  --size-h3:24px;
  --tracking-display:-.02em;
  --reveal-duration:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-space)}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--size-body);line-height:1.6;-webkit-font-smoothing:antialiased}
[hidden]{display:none!important}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
button{color:inherit;cursor:pointer}
button:disabled{cursor:not-allowed}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,[tabindex]:focus-visible{outline:var(--focus-ring);outline-offset:3px}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:var(--weight-regular);line-height:1.2;text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--size-h1);line-height:1.1;letter-spacing:var(--tracking-display)}
h2{font-size:var(--size-h2);letter-spacing:var(--tracking-display)}
h3{font-size:var(--size-h3)}
p{margin:0 0 1.25em}
code{font-family:var(--font-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--bg-panel-2);border:1px solid var(--border);border-radius:var(--r-md)}
pre code{overflow-wrap:normal;white-space:pre}
.wrap{width:100%;max-width:calc(var(--container) + 48px);margin:0 auto;padding-inline:var(--gutter)}
.section{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.no-break{white-space:nowrap}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.panel{min-width:0;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-md);padding:28px;box-shadow:inset 0 0 0 1px var(--hi)}
.prose{min-width:0;max-width:78ch}
.prose p,.prose li{overflow-wrap:anywhere}
.prose a:not(.btn){color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
.prose h2{margin-top:1.8em}
.prose h3{margin-top:1.5em}
.prose li+li{margin-top:8px}
.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}
.grid-three>*,.grid-five>*{min-width:0}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 30px;border:0;border-radius:var(--r-pill);font-size:var(--size-body);font-weight:var(--weight-medium);line-height:1.2;text-align:center;flex-shrink:0;white-space:nowrap}
.btn svg{width:16px;height:16px;flex:none}
.btn-solid,.btn-primary{background:var(--text);color:var(--white);box-shadow:0 10px 22px -12px var(--shadow-ink-strong)}
.btn-solid:hover,.btn-primary:hover,.btn.is-hover{background:var(--accent-dark);color:var(--white)}
.btn-solid:active,.btn-primary:active{background:var(--accent-dark)}
.btn-line,.btn-secondary{background:var(--white);color:var(--text);border:1.5px solid var(--text)}
.btn-line:hover,.btn-secondary:hover{background:var(--bg-panel)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--slot-strong);color:var(--text-muted);border:1px solid var(--border);box-shadow:none}
.btn.is-focus{outline:var(--focus-ring);outline-offset:3px}
.announce{display:flex;justify-content:center;align-items:center;flex-wrap:wrap;gap:4px 8px;background:var(--announce);color:var(--text);font-size:14px;line-height:20px;padding:9px 24px;text-align:center}
.announce strong{font-weight:var(--weight-bold)}
.announce-sep{color:var(--text-muted)}
.announce-arrow{font-family:var(--font-mono)}
.announce:hover .announce-arrow{color:var(--violet)}
#site-header{position:relative;z-index:50}
.topnav{position:relative;z-index:50;background:var(--bg-panel);border-bottom:1px solid var(--border)}
.nav-inner{display:flex;align-items:stretch;height:60px;gap:32px}
.brand{display:flex;align-items:center;gap:9px;flex:none}
.brand img{width:26px;height:26px;flex:none}
.brand-word{font-family:var(--font-display);font-weight:var(--weight-semibold);font-size:19px;letter-spacing:-.01em;color:var(--text)}
.tabs{display:flex;align-items:stretch;flex:1;min-width:0}
.tab-list{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px;min-width:0;overflow-x:auto;scrollbar-width:none;width:100%}
.tab-list li{display:flex;align-self:stretch;flex-shrink:0}
.tab{position:relative;display:flex;align-items:center;padding:0 12px;font-size:14.5px;color:var(--text-muted);white-space:nowrap;min-height:44px}
.tab:hover{color:var(--text)}
.tab[aria-current="page"]{color:var(--text);font-weight:var(--weight-medium)}
.tab[aria-current="page"]::after{content:"";position:absolute;left:12px;right:12px;bottom:-1px;height:2px;border-radius:var(--r-xs);background:linear-gradient(90deg,var(--violet),var(--accent))}
.nav-end{display:flex;align-items:center;gap:10px;flex:none}
.lang-box{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;height:34px;padding:0 10px;border:0;background:var(--transparent);font:inherit;font-size:14px;color:var(--text-muted);border-radius:var(--r-sm);cursor:pointer}
.lang:hover{color:var(--text);background:var(--slot)}
.lang svg{width:15px;height:15px;flex:none}
.lang-text{white-space:nowrap}
.lang-caret{font-size:11px}
.lang-menu{position:absolute;right:0;top:calc(100% + 12px);z-index:80;width:180px;padding:8px;background:var(--white);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-float)}
.lang-menu a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-sm)}
.lang-menu a:hover,.lang-menu a[aria-current="true"]{background:var(--violet-soft)}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:36px;padding:0 20px;border-radius:var(--r-pill);border:1.5px solid var(--text);background:var(--white);font-size:14px;font-weight:var(--weight-medium);color:var(--text);white-space:nowrap}
.login:hover{background:var(--text);color:var(--white)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border:0;border-radius:var(--r-sm);background:var(--transparent)}
.menu-toggle svg{width:22px;height:22px;stroke:currentColor;fill:none;stroke-width:2}
.mobile-drawer{display:none}
.nav-veil{display:none}
html.nav-open{overflow:hidden}
.site-footer{background:var(--bg-panel-2);border-top:1px solid var(--border);padding-top:56px;padding-bottom:24px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px}
.footer-grid>*{min-width:0}
.footer-intro{margin-top:18px;max-width:32ch;color:var(--text-muted)}
.footer-heading{margin:0 0 16px;font-size:16px;font-weight:var(--weight-semibold)}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 16px;list-style:none;padding:0;margin:0}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;font-size:14px}
.footer-links a:hover,.footer-languages a:hover{color:var(--accent-dark);text-decoration:underline}
.footer-languages{display:flex;flex-wrap:wrap;gap:10px 24px;margin-top:32px}
.footer-languages a{display:inline-flex;align-items:center;min-height:28px;font-size:14px}
.footer-bottom{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;border-top:1px solid var(--border);padding-top:20px;margin-top:24px;color:var(--text-muted);font-size:13px}
.footer-legal{display:flex;gap:20px;flex-wrap:wrap}
.footer-legal a{min-height:24px;display:inline-flex;align-items:center}
.reveal{transition:opacity var(--reveal-duration) ease,transform var(--reveal-duration) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:static;display:block;min-width:0;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status+*{margin-top:32px}
.decor-section,.stripe-halo-host{position:relative;overflow-x:clip;max-width:100%}
@media(max-width:1100px){
  .nav-inner{height:auto;flex-wrap:wrap;gap:0 16px}
  .brand,.nav-end{height:56px}
  .nav-end{margin-left:auto}
  .tabs{order:3;flex-basis:100%;height:44px;border-top:1px solid var(--line)}
  .tab-list{align-items:stretch}
  .tab-list li:first-child .tab{padding-left:0}
  .tab-list li:first-child .tab[aria-current="page"]::after{left:0}
  .grid-five{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media(max-width:768px){
  :root{--size-h1:clamp(28px,7vw,40px);--size-h2:30px;--section-space:56px}
  .nav-inner{height:60px;flex-wrap:nowrap;gap:12px}
  .brand,.nav-end{height:60px}
  .nav-end{margin-left:auto;gap:6px}
  .tabs{display:none}
  .menu-toggle{display:inline-flex}
  .mobile-drawer{position:fixed;top:var(--shell-height);left:0;right:0;height:calc(100dvh - var(--shell-height));max-height:calc(100dvh - var(--shell-height));overflow-y:auto;overscroll-behavior:contain;background:var(--bg-panel);z-index:45;padding:16px var(--gutter) 32px;border-top:1px solid var(--border)}
  .mobile-drawer:not([hidden]){display:block}
  .mobile-drawer a{display:flex;width:100%;align-items:center;min-height:46px;padding:10px 12px;border-radius:var(--r-sm)}
  .mobile-drawer a:hover,.mobile-drawer a[aria-current="page"]{background:var(--violet-soft)}
  .drawer-languages{border-top:1px solid var(--border);padding-top:12px;margin-top:16px}
  .nav-veil:not([hidden]){display:block;position:fixed;inset:var(--shell-height) 0 0;z-index:40;background:var(--veil);border:0;width:100%}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:28px}
  .grid-three{grid-template-columns:minmax(0,1fr)}
  .grid-five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .lang-text{display:none}
}
@media(max-width:640px){
  :root{--gutter:20px;--size-h2:28px}
  .no-break{white-space:normal}
  .announce{font-size:13px}
  .brand-word{font-size:17px}
  .brand{gap:6px}
  .login{padding:0 14px}
  .nav-inner{gap:8px}
  .lang{padding:0 6px}
  .btn{min-height:46px;padding:0 24px}
  .panel{padding:20px}
  .tilt,[data-tilt]{transform:none!important}
  .decor-section,.stripe-halo-host{max-width:100%;overflow-x:clip}
}
@media(max-width:360px){
  :root{--gutter:16px;--shell-height:122px}
  .announce{min-height:62px}
  .brand img{width:23px;height:23px}
  .brand-word{font-size:16px}
  .nav-end{gap:2px}
  .login{padding:0 12px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}