:root{
  color-scheme:light;
  --bg:#E7ECF7;--hero-top:#EEF2FA;--hero-bottom:#E3E9F5;
  --panel:#F7F9FD;--panel-2:#DAE2F1;--panel-sunk:#EEF2FA;
  --panel-faint:rgba(247,249,253,.55);--glass:rgba(247,249,253,.74);
  --border:#C9D3E6;--border-soft:#DDE4F1;
  --accent:#8A2BB8;--accent-2:#A84BD6;--accent-dark:#5F1A82;
  --accent-tint:rgba(138,43,184,.07);--accent-line:rgba(138,43,184,.30);
  --on-accent:#FFFFFF;--text:#161A2E;--text-muted:#535C78;--text-faint:#8A93AD;
  --success:#12805C;--success-tint:rgba(18,128,92,.10);--warn:#B7791F;--error:#C2333F;
  --ice:rgba(98,160,255,.13);--clear:transparent;--veil:rgba(22,26,46,.28);
  --flag-red:#C8323C;--flag-navy:#1F2C66;--flag-blue:#2B3F8F;--flag-white:#FFFFFF;
  --flag-edge:rgba(22,26,46,.14);--flag-shadow:rgba(22,26,46,.22);
  --font-display:"Inter","Noto Sans SC","PingFang SC","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-3:3px;--r-6:6px;--r-8:8px;--r-10:10px;--r-12:12px;--r-24:24px;--r-pill:999px;--r-circle:50%;
  --hl-inset:inset 0 0 0 1px rgba(255,255,255,.9);
  --hl-top:inset 0 1px 0 rgba(255,255,255,.95);--hl-on-accent:rgba(255,255,255,.28);
  --shadow-amethyst:0 40px 80px -30px rgba(138,43,184,.10),0 18px 44px -22px rgba(138,43,184,.10),0 1px 2px rgba(22,26,46,.06);
  --shadow-amethyst-strong:0 26px 52px -20px rgba(138,43,184,.20),0 2px 6px rgba(22,26,46,.06);
  --shadow-chip:0 14px 30px -16px rgba(53,66,112,.30),0 1px 2px rgba(22,26,46,.05);
  --shadow-cta:0 12px 26px -12px rgba(138,43,184,.50);
  --shadow-pill:0 2px 6px -2px rgba(53,66,112,.22);--knob-shadow:0 1px 2px rgba(22,26,46,.25);
  --gutter:32px;--content-width:1304px;--reading-width:800px;
  --header-height:68px;--anchor-gap:84px;--toc-height:64px;
  --ease:cubic-bezier(.2,.65,.3,1);--fast:.2s;--reveal-time:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-gap);scroll-behavior:smooth}
html.nav-open{overflow:hidden}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:16px;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{cursor:pointer}
button:disabled{cursor:not-allowed}
img{display:block;max-width:100%;height:auto}
svg{display:block;flex-shrink:0;max-width:100%}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-6)}
h1,h2,h3,h4{font-family:var(--font-display);line-height:1.25;text-wrap:balance;overflow-wrap:break-word}
h1{margin:0;font-size:clamp(52px,4.8vw,68px);font-weight:900;line-height:1.1;letter-spacing:-.02em}
h2{margin:0 0 24px;font-size:clamp(30px,3vw,44px);font-weight:900;letter-spacing:-.02em}
h3{margin:0 0 12px;font-size:22px;font-weight:750}
p{margin:0 0 20px}
ul,ol{padding-left:24px}
li+li{margin-top:6px}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere;background:var(--panel-sunk);border-radius:var(--r-3);padding:2px 5px}
pre{max-width:100%;overflow-x:auto;background:var(--panel-2);border:1px solid var(--border);border-radius:var(--r-8);padding:20px}
pre code{padding:0;background:var(--clear);overflow-wrap:normal;white-space:pre}
hr{border:0;border-top:1px solid var(--border);margin:32px 0}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter);min-width:0}
.reading-wrap{width:100%;max-width:var(--reading-width);margin-inline:auto;padding-inline:var(--gutter);min-width:0}
.section{padding-top:80px;padding-bottom:80px}
.section-head{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:start;margin-bottom:40px}
.section-head>*,.grid>*,.hero__grid>*,.footer-grid>*{min-width:0}
.section-head p{color:var(--text-muted);max-width:560px}
.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))}
.stack-flow>*+*{margin-top:24px}
.no-break{white-space:nowrap}
.num{font-family:var(--font-mono);font-weight:600;font-variant-numeric:tabular-nums;letter-spacing:-.01em}
.muted{color:var(--text-muted)}
.text-link{display:inline-flex;align-items:center;min-height:24px;color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.panel,.card{min-width:0;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-12);box-shadow:var(--hl-inset),var(--shadow-amethyst);padding:28px}
.panel--sunk{background:var(--panel-2);box-shadow:var(--hl-top)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:52px;padding:14px 26px;border:1px solid var(--clear);border-radius:var(--r-8);font-size:16px;font-weight:600;line-height:1.35;white-space:nowrap;flex-shrink:0;transition:background-color var(--fast),transform var(--fast),box-shadow var(--fast)}
.btn:hover{transform:translateY(-1px)}
.btn--primary,.btn-primary{background:var(--accent);color:var(--on-accent);box-shadow:var(--shadow-cta)}
.btn--primary:hover,.btn-primary:hover{background:var(--accent-dark)}
.btn--ghost{background:var(--panel);color:var(--text);border-color:var(--text)}
.btn--ghost:hover{background:var(--flag-white)}
.btn--small{min-height:44px;padding:10px 18px;font-size:14px}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.55;pointer-events:none;box-shadow:none;transform:none}
.btn-demo-hover{background:var(--accent-dark)}
.btn-demo-focus{outline:2px solid var(--accent);outline-offset:3px}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.topbar{position:relative;z-index:50;background:var(--hero-top)}
.stage .topbar{background:var(--clear)}
.topbar__inner{display:flex;align-items:center;gap:36px;height:var(--header-height);flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:9px;font-family:var(--font-display);font-size:20px;font-weight:800;letter-spacing:-.02em;color:var(--text);flex-shrink:0;min-height:44px;white-space:nowrap}
.brand img{width:26px;height:30px;object-fit:contain}
.brand__local{font-size:.8em;font-weight:500;color:var(--text-muted)}
.mainnav{min-width:0;flex:1}
.mainnav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px;width:max-content;max-width:100%;background:var(--glass);border:1px solid var(--border-soft);border-radius:var(--r-pill);box-shadow:var(--hl-top)}
.mainnav li{margin:0}
.mainnav a{display:flex;align-items:center;justify-content:center;min-height:36px;padding:7px 15px;border-radius:var(--r-pill);font-size:14px;font-weight:500;line-height:1.4;color:var(--text-muted);white-space:nowrap;transition:color var(--fast),background-color var(--fast)}
.mainnav a:hover{color:var(--text)}
.mainnav a.is-on{background:var(--panel);color:var(--text);font-weight:600;box-shadow:var(--hl-top),var(--shadow-pill)}
.topbar__tools{margin-left:auto;display:flex;align-items:center;gap:18px;flex-shrink:0}
.language{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:38px;width:auto;padding:6px 4px;background:var(--clear);border:0;font-size:14px;font-weight:500;color:var(--text-muted)}
.lang span{white-space:nowrap}
.lang:hover{color:var(--text)}
.lang__caret{font-size:11px}
.lang-panel{position:absolute;right:0;top:calc(100% + 8px);z-index:80;min-width:176px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-10);box-shadow:var(--shadow-chip)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:9px 12px;border-radius:var(--r-6);font-size:14px}
.lang-panel a:hover,.lang-panel a[aria-current]{background:var(--panel-2)}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:38px;padding:8px 20px;border-radius:var(--r-8);background:var(--text);color:var(--panel);font-size:14px;font-weight:600;white-space:nowrap;transition:background-color var(--fast)}
.login:hover{background:var(--accent-dark)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:10px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-8)}
.menu-toggle__line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-pill)}
.menu-toggle[aria-expanded="true"]{background:var(--panel-2)}
.mobile-drawer{display:none}
.nav-veil{display:none}
.site-footer{background:var(--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 1fr;gap:40px}
.footer-brand p{margin-top:18px;max-width:320px;color:var(--text-muted);font-size:14px}
.footer-heading{margin:0 0 16px;font-size:15px;font-weight:700}
.footer-links{display:grid;gap:6px;list-style:none;margin:0;padding:0}
.footer-links li{margin:0;min-width:0}
.footer-links a{display:inline-flex;align-items:center;min-height:30px;font-size:14px;color:var(--text-muted);overflow-wrap:anywhere}
.footer-links a:hover{color:var(--accent-dark);text-decoration:underline}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px;margin-top:40px;padding-top:24px;border-top:1px solid var(--border);font-size:13px;color:var(--text-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.footer-legal a{display:inline-flex;align-items:center;min-height:24px}
.prose{min-width:0;line-height:1.9}
.prose h2{margin-top:56px;font-size:32px}
.prose h3{margin-top:32px}
.prose p,.prose li{overflow-wrap:break-word}
.prose a:not(.btn){color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
.prose img{border-radius:var(--r-8)}
.reveal{transition:opacity var(--reveal-time) var(--ease),transform var(--reveal-time) var(--ease)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{display:block;position:relative;min-width:0;max-width:100%;min-height:64px;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status+*{margin-top:32px}
[data-count]{display:inline-block;min-width:3ch;font-family:var(--font-mono);font-variant-numeric:tabular-nums;text-align:right}
[data-count="14"]{min-width:2ch}
.decor-zone{position:relative;overflow-x:clip;max-width:100%}
@media(max-width:1240px){
  .topbar__inner{gap:20px}
  .mainnav a{padding-inline:10px}
}
@media(max-width:1100px){
  .mainnav{display:none}
  .topbar__tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .mobile-drawer{position:fixed;top:var(--header-height);right:0;left:0;z-index:60;display:block;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);padding:20px var(--gutter) 36px;border-top:1px solid var(--border)}
  .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-radius:var(--r-8);font-size:15px;color:var(--text-muted)}
  .mobile-drawer a.is-on,.mobile-drawer a[aria-current]{background:var(--panel-2);color:var(--text);font-weight:650}
  .drawer-languages{margin-top:20px;padding-top:16px;border-top:1px solid var(--border)}
  .nav-veil{display:block;position:fixed;inset:var(--header-height) 0 0;z-index:40;border:0;background:var(--veil)}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--five{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media(max-width:768px){
  :root{--gutter:20px}
  h1{font-size:38px}
  h2{font-size:30px}
  .section{padding-top:56px;padding-bottom:56px}
  .section-head{grid-template-columns:minmax(0,1fr);gap:12px}
  .grid--three{grid-template-columns:minmax(0,1fr)}
  .grid--five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .topbar__inner{gap:12px}
  .topbar__tools{margin-left:auto;gap:10px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .tilt,.decor-tilt{transform:none}
  .decor-zone{max-width:100%;overflow-x:clip}
  .brand{font-size:17px;gap:6px}
  .brand img{width:22px;height:26px}
  .topbar__inner{gap:6px}
  .topbar__tools{gap:6px;margin-left:auto}
  .lang{font-size:12px;gap:3px;padding-inline:0}
  .login{padding-inline:12px;font-size:13px}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:28px}
  .panel,.card{padding:22px}
  .prose h2{font-size:28px}
}
@media(max-width:360px){
  .brand{font-size:15px;gap:4px}
  .brand img{width:20px}
  .login{padding-inline:10px}
  .topbar__tools{gap:4px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
  .btn:hover{transform:none}
}