:root{
  --bg:#FBFBFE;
  --bg-top:#FFFFFF;
  --bg-fade:#F6F6FB;
  --panel:#FFFFFF;
  --canvas:#F1F0FA;
  --border:#E4E3EE;
  --accent:#4B3BEF;
  --accent-dark:#3326C4;
  --accent-2:#2F7BFF;
  --accent-soft:#F6F5FF;
  --accent-tint:#E8E6FD;
  --text:#0F0E1A;
  --muted:#5E5C70;
  --faint:#A3A1B5;
  --success:#12996A;
  --success-ring:rgba(18,153,106,.18);
  --warn:#C98A10;
  --error:#D9363E;
  --on-accent:#FFFFFF;
  --hi:rgba(255,255,255,.3);
  --hi-dot:rgba(255,255,255,.45);
  --hi-text:rgba(255,255,255,.9);
  --glow-1:rgba(75,59,239,.06);
  --glow-2:rgba(47,123,255,.06);
  --veil:rgba(15,14,26,.3);
  --clear:transparent;
  --shade-sm:0 1px 2px rgba(75,59,239,.06),0 6px 14px -6px rgba(75,59,239,.12);
  --shade-md:0 2px 6px rgba(75,59,239,.05),0 18px 40px -16px rgba(75,59,239,.12);
  --shade-lg:0 4px 12px rgba(75,59,239,.06),0 40px 80px -28px rgba(75,59,239,.12);
  --shade-drag:0 8px 18px rgba(75,59,239,.10),0 30px 60px -18px rgba(75,59,239,.12);
  --shade-cta:0 10px 24px -12px rgba(75,59,239,.55);
  --flag-red:#D52B3B;
  --flag-blue:#22408F;
  --flag-white:#FFFFFF;
  --flag-edge:rgba(15,14,26,.14);
  --r-focus:4px;
  --r-tool:7px;
  --r-tool-item:5px;
  --r-btn:8px;
  --r-tile:6px;
  --r-blk:8px;
  --r-card:10px;
  --r-win:14px;
  --r-canvas:20px;
  --r-pill:999px;
  --r-circle:50%;
  --f-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --f-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --gutter:40px;
  --page-width:1392px;
  --header-height:72px;
  --toc-height:64px;
  --anchor-space:152px;
  --text-base:16px;
  --text-small:14px;
  --text-tiny:12px;
  --display-size:68px;
  --heading-size:44px;
  --subheading-size:24px;
  --weight-display:900;
  --weight-bold:700;
  --weight-medium:500;
  --leading-body:1.6;
  --leading-display:1.1;
  --tracking-display:-.02em;
  --speed:.2s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:88px;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--f-body);font-size:var(--text-base);line-height:var(--leading-body);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
[hidden]{display:none!important}
img{max-width:100%;height:auto;vertical-align:middle}
svg{width:20px;height:20px;flex-shrink:0;vertical-align:middle}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
a{color:inherit;text-underline-offset:4px}
button,a,summary{touch-action:manipulation}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-focus)}
h1,h2,h3,h4{font-family:var(--f-display);color:var(--text);overflow-wrap:break-word}
h1,.h1{font-size:var(--display-size);font-weight:var(--weight-display);line-height:var(--leading-display);letter-spacing:var(--tracking-display)}
h2{font-size:var(--heading-size);font-weight:var(--weight-display);line-height:1.2;letter-spacing:var(--tracking-display);text-wrap:balance}
h3{font-size:var(--subheading-size);font-weight:var(--weight-bold);line-height:1.4}
p{margin-block:0 20px}
ul,ol{padding-left:24px}
code{font-family:var(--f-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--canvas);border:1px solid var(--border);border-radius:var(--r-card)}
pre code{white-space:pre;overflow-wrap:normal}
blockquote{margin-inline:0}
table{border-collapse:collapse}
input,select,textarea{max-width:100%;border:1px solid var(--border);border-radius:var(--r-btn);background:var(--panel);padding:10px 14px}
.wrap{width:100%;max-width:var(--page-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:88px;padding-bottom:88px}
.section-title{margin:0 0 24px}
.section-intro{color:var(--muted);max-width:680px}
.grid{display:grid;gap:24px}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-five{grid-template-columns:repeat(5,minmax(0,1fr))}
.grid>*{min-width:0}
.panel,.card{min-width:0;padding:28px;border:1px solid var(--border);border-radius:var(--r-card);background:var(--panel);box-shadow:var(--shade-md)}
.panel-soft{background:var(--canvas)}
.muted{color:var(--muted)}
.mono{font-family:var(--f-mono);font-variant-numeric:tabular-nums}
.no-break{white-space:nowrap}
.skip{position:absolute;left:16px;top:-60px;padding:8px 14px;border-radius:var(--r-btn);background:var(--text);color:var(--on-accent);text-decoration:none;z-index:100}
.skip:focus{top:12px}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.icon{width:20px;height:20px;flex-shrink:0}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:52px;padding:12px 28px;border:0;border-radius:var(--r-btn);font-size:var(--text-base);font-weight:600;line-height:1.5;text-decoration:none;white-space:nowrap;flex-shrink:0;transition:background var(--speed),transform var(--speed)}
.btn-solid,.btn-primary{background:var(--accent);color:var(--on-accent);box-shadow:inset 0 1px 0 var(--hi),var(--shade-cta)}
.btn-solid:hover,.btn-primary:hover{background:var(--accent-dark);transform:translateY(-1px)}
.btn-line,.btn-secondary{background:var(--panel);color:var(--text);border:1.5px solid var(--text)}
.btn-line:hover,.btn-secondary:hover{background:var(--accent-soft)}
.btn:active{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{cursor:not-allowed;background:var(--canvas);color:var(--muted);box-shadow:none;transform:none}
.btn-small{min-height:40px;font-size:var(--text-small);padding:8px 16px}
.cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.badge,.tag{display:inline-flex;align-items:center;gap:6px;max-width:100%;padding:5px 10px;border:1px solid var(--border);border-radius:var(--r-pill);background:var(--panel);color:var(--text);font-size:var(--text-tiny);font-weight:600;overflow-wrap:anywhere}
.badge-accent{background:var(--accent-tint);border-color:var(--accent-tint);color:var(--accent-dark)}
.status-dot{display:inline-block;width:8px;height:8px;flex-shrink:0;border-radius:var(--r-circle);background:var(--success);box-shadow:0 0 0 4px var(--success-ring)}
.top{position:relative;z-index:40;border-bottom:1px solid var(--border);background:var(--bg-top)}
.top-row{display:flex;align-items:center;flex-wrap:nowrap;gap:40px;height:var(--header-height)}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none;text-decoration:none;color:var(--text);font-weight:800;font-size:20px;letter-spacing:var(--tracking-display);white-space:nowrap}
.brand img{width:32px;height:32px;flex-shrink:0}
.desktop-nav{flex:1;min-width:0}
.tabs{display:flex;align-items:center;justify-content:center;gap:2px;list-style:none;margin:0;padding:0;height:var(--header-height)}
.tabs li{height:100%;flex-shrink:0}
.tabs a{position:relative;display:flex;align-items:center;height:100%;padding:0 14px;color:var(--muted);text-decoration:none;font-size:15px;font-weight:500;white-space:nowrap;transition:color var(--speed)}
.tabs a::after{content:"";position:absolute;left:14px;right:14px;bottom:-1px;height:2px;border-radius:var(--r-focus);background:var(--accent);transform:scaleX(0);transition:transform .25s ease}
.tabs a:hover{color:var(--text)}
.tabs a:hover::after{transform:scaleX(.35)}
.tabs a[aria-current="page"]{color:var(--text);font-weight:600}
.tabs a[aria-current="page"]::after{transform:scaleX(1)}
.acts{display:flex;align-items:center;gap:8px;flex-shrink:0}
.lang-box{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;border-radius:var(--r-btn);background:var(--clear);color:var(--text);font-size:var(--text-small);font-weight:500;white-space:nowrap}
.lang:hover{background:var(--canvas)}
.lang svg{width:16px;height:16px;color:var(--muted)}
.lang-txt{white-space:nowrap}
.caret{font-size:11px;color:var(--muted)}
.lang-panel{position:absolute;right:0;top:calc(100% + 12px);z-index:70;min-width:180px;padding:8px;border:1px solid var(--border);border-radius:var(--r-card);background:var(--panel);box-shadow:var(--shade-lg)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-tile);text-decoration:none;font-size:var(--text-small)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--canvas);color:var(--accent-dark)}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:8px 20px;border-radius:var(--r-btn);background:var(--accent);color:var(--on-accent);text-decoration:none;font-size:15px;font-weight:600;white-space:nowrap;transition:background var(--speed)}
.login:hover{background:var(--accent-dark)}
.menu{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:8px;border:1px solid var(--border);border-radius:var(--r-btn);background:var(--panel);color:var(--text)}
.menu svg{width:20px;height:20px}
.drawer{position:fixed;top:var(--header-height);left:0;right:0;z-index:39;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;padding:16px var(--gutter) 32px;background:var(--panel);border-top:1px solid var(--border)}
.drawer ul{list-style:none;margin:0;padding:0}
.drawer a{display:flex;align-items:center;width:100%;min-height:48px;padding:12px 8px;text-decoration:none;border-bottom:1px solid var(--border)}
.drawer a[aria-current]{color:var(--accent-dark);font-weight:700}
.drawer-languages{margin-top:24px}
.drawer-label{color:var(--muted);font-size:var(--text-small);margin:16px 8px 8px}
html.nav-open{overflow:hidden}
.site-footer{padding-top:64px;padding-bottom:24px;border-top:1px solid var(--border);background:var(--bg-fade)}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:64px}
.footer-grid>*{min-width:0}
.footer-intro{margin-top:20px;max-width:340px;color:var(--muted);font-size:var(--text-small)}
.footer-title{font-size:var(--text-base);font-weight:700;margin:0 0 16px}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 16px;list-style:none;margin:0;padding:0}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:32px;text-decoration:none;font-size:var(--text-small);color:var(--muted)}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--accent-dark)}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:40px}
.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:var(--text-small);color:var(--muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:8px 20px}
.reveal{transition:opacity .35s ease,transform .35s 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:32px}
.prose{max-width:800px;min-width:0;overflow-wrap:break-word}
.prose h2{margin-top:56px;font-size:32px}
.prose h3{margin-top:32px;font-size:22px}
.prose li{margin-block:8px}
.prose p{line-height:1.85}
@media(max-width:1279px){
  .top-row{gap:24px}
  .tabs a{padding-inline:10px;font-size:var(--text-small)}
  .tabs a::after{left:10px;right:10px}
}
@media(max-width:1150px){
  .desktop-nav{display:none}
  .acts{margin-left:auto}
  .menu{display:inline-flex}
}
@media(max-width:768px){
  :root{--gutter:20px;--display-size:40px;--heading-size:32px}
  .section{padding-top:56px;padding-bottom:56px}
  .grid-three,.grid-five{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .lang-txt{display:none}
  .top-row{gap:12px}
  .acts{margin-left:auto}
  .prose h2{font-size:28px}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,.chip-a,.drag-card{transform:none}
  .btn{padding-inline:20px}
  .panel,.card{padding:20px}
  .footer-bottom{align-items:flex-start;flex-direction:column}
}
@media(max-width:380px){
  :root{--gutter:16px}
  .brand{font-size:17px;gap:6px}
  .brand img{width:28px;height:28px}
  .acts{gap:4px}
  .lang{padding-inline:7px}
  .login{padding-inline:12px;font-size:var(--text-small)}
  .top-row{gap: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}
}