:root{
  --bg:#F7F6F9;--panel:#FFFFFF;--panel-2:#EFEDF3;--border:#E1DEE8;
  --accent:#BE1FCC;--accent-dark:#8A1496;--accent-2:#7A2BD8;
  --ink:#1C1730;--ink-hover:#2D2648;--muted:#5E5970;--muted-2:#8D889C;
  --success:#1E9E62;--warn:#C77A0A;--error:#D3263A;
  --atmo-a:#FBFAFC;--atmo-b:#EADFF1;--announce:#F3E4F6;
  --basin-a:#F1EAF5;--basin-b:#D9B8E6;--basin-b-0:rgba(217,184,230,0);--basin-b-60:rgba(217,184,230,.6);
  --ion-bg-a:#FCEEF9;--ion-bg-b:#E9D2F3;
  --white:#FFFFFF;--hl:rgba(255,255,255,.92);--hl-soft:rgba(255,255,255,.6);--glass:rgba(255,255,255,.62);
  --tint-06:rgba(190,31,204,.06);--tint-12:rgba(190,31,204,.12);--tint-18:rgba(190,31,204,.18);--tint-24:rgba(190,31,204,.24);
  --violet-20:rgba(122,43,216,.2);--violet-34:rgba(122,43,216,.34);
  --ink-04:rgba(28,23,48,.04);--ink-06:rgba(28,23,48,.06);--ink-10:rgba(28,23,48,.10);--ink-16:rgba(28,23,48,.16);
  --success-12:rgba(30,158,98,.12);--transparent:transparent;
  --flag-red:#C8283F;--flag-blue:#24387A;--flag-white:#FFFFFF;
  --r-xs:6px;--r-sm:10px;--r-md:12px;--r-lg:14px;--r-win:20px;--r-basin:48px;--r-pill:999px;--r-circle:50%;
  --font-display:'Inter','Noto Sans SC','PingFang SC','Microsoft YaHei',system-ui,sans-serif;
  --font-body:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans','Microsoft YaHei',system-ui,sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,'SFMono-Regular',Menlo,Consolas,monospace;
  --text-xs:12px;--text-sm:14px;--text-body:16px;--text-lead:20px;--text-h3:24px;--text-h2:36px;
  --weight-body:400;--weight-medium:500;--weight-strong:600;--weight-bold:700;--weight-display:800;--weight-zh:900;
  --shadow-card:0 8px 22px -14px var(--tint-24);
  --shadow-float:0 0 0 1px var(--ink-06),0 16px 36px -12px var(--tint-24),0 2px 6px var(--tint-06);
  --shadow-win:0 0 0 1px var(--ink-06),0 34px 80px -6px var(--tint-12),0 12px 28px -16px var(--tint-24);
  --wrap:1240px;--reading:820px;--gutter:32px;--chrome-h:96px;--nav-h:60px;--anchor-offset:80px;--toc-offset:88px;
  --ease:cubic-bezier(.2,.7,.2,1);--hover-time:.18s;--reveal-time:.55s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
html.nav-open{overflow:hidden}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font-body);font-size:var(--text-body);line-height:1.6;font-weight:var(--weight-body);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
a{color:var(--accent-dark);text-underline-offset:4px}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
[hidden]{display:none!important}
h1,h2,h3{font-family:var(--font-display);text-wrap:balance}
h1{margin:0 0 24px;font-size:clamp(52px,5vw,72px);line-height:1.12;font-weight:var(--weight-zh);letter-spacing:-.02em}
h2{margin:0 0 24px;font-size:var(--text-h2);line-height:1.25;font-weight:var(--weight-display);letter-spacing:-.02em}
h3{margin:0 0 16px;font-size:var(--text-h3);line-height:1.35;font-weight:var(--weight-bold)}
p{margin:0 0 20px}
strong,b{font-weight:var(--weight-bold)}
code{font-family:var(--font-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--panel-2);font-family:var(--font-mono);font-size:var(--text-sm)}
pre code{overflow-wrap:normal;white-space:pre}
.wrap{width:100%;max-width:calc(var(--wrap) + var(--gutter)*2);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:calc(var(--reading) + var(--gutter)*2);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:72px;padding-bottom:72px}
.section-head{max-width:780px;margin-bottom:32px}
.prose{min-width:0;overflow-wrap:anywhere}
.prose p,.prose li{line-height:1.85}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose img{border-radius:var(--r-md)}
.no-break{white-space:nowrap}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono)}
.skip{position:fixed;left:16px;top:8px;z-index:99;min-width:24px;min-height:44px;padding:10px 14px;transform:translateY(calc(-100% - 16px));white-space:nowrap;border-radius:var(--r-pill);background:var(--ink);color:var(--white);font-size:var(--text-sm);text-decoration:none}
.skip:focus{transform:none}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.ico{fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.ico-fill{fill:currentColor;stroke:none}
.panel,.card{min-width:0;border-radius:var(--r-md);background:var(--panel);box-shadow:0 0 0 1px var(--border),var(--shadow-card)}
.panel{padding:24px;box-shadow:inset 0 1px 0 var(--hl),0 16px 48px -24px var(--tint-12),0 0 0 1px var(--border)}
.panel-soft{background:var(--panel-2)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:50px;min-width:164px;padding:0 28px;border:0;border-radius:var(--r-pill);font-size:var(--text-body);font-weight:var(--weight-strong);text-decoration:none;white-space:nowrap;flex-shrink:0;transition:background-color var(--hover-time),box-shadow var(--hover-time),transform var(--hover-time)}
.btn svg{width:18px;height:18px}
.btn-solid,.btn-primary{background:var(--ink);color:var(--white);box-shadow:0 10px 24px -12px var(--ink-16),0 14px 30px -14px var(--tint-24)}
.btn-solid:hover,.btn-primary:hover{background:var(--ink-hover);transform:translateY(-1px)}
.btn-line,.btn-secondary{background:var(--transparent);color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--ink)}
.btn-line:hover,.btn-secondary:hover{background:var(--ink-04)}
.btn-small{height:40px;min-width:0;padding-inline:20px;font-size:var(--text-sm)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--panel-2);color:var(--muted);box-shadow:inset 0 0 0 1px var(--border);cursor:not-allowed;transform:none}
.btn-demo-hover{background:var(--ink-hover);color:var(--white)}
.btn-demo-focus{outline:2px solid var(--accent);outline-offset:3px}
.announce{background:var(--announce);color:var(--ink);font-size:13.5px;line-height:20px}
.announce .wrap{display:flex;align-items:center;gap:14px;height:36px}
.announce-text{color:var(--ink)}
.announce-link{display:inline-flex;align-items:center;gap:4px;min-height:24px;color:var(--ink);font-weight:var(--weight-strong);text-decoration:none;border-bottom:1px solid var(--ink-16);line-height:18px;transition:border-color var(--hover-time)}
.announce-link:hover{border-color:var(--ink)}
.shell{position:relative;isolation:isolate;overflow-x:clip;max-width:100%;background:linear-gradient(135deg,var(--atmo-a) 0%,var(--bg) 42%,var(--atmo-b) 100%)}
.shell-grain{position:absolute;inset:0;width:100%;height:100%;z-index:-1;opacity:.03;mix-blend-mode:multiply;pointer-events:none}
.nav{position:relative;z-index:20;height:var(--nav-h);background:var(--glass);border-bottom:1px solid var(--ink-06);-webkit-backdrop-filter:saturate(1.2) blur(10px);backdrop-filter:saturate(1.2) blur(10px)}
.nav .wrap{display:flex;align-items:center;gap:24px;height:100%}
.brand{display:inline-flex;align-items:center;gap:8px;flex:none;min-height:24px;color:var(--ink);text-decoration:none}
.brand img,.brand svg{width:26px;height:26px;flex:none}
.brand-en{font-family:var(--font-display);font-size:19px;font-weight:var(--weight-display);letter-spacing:-.02em;line-height:1}
.brand-zh{padding-left:8px;border-left:1px solid var(--border);font-size:13.5px;font-weight:var(--weight-medium);line-height:16px;color:var(--muted)}
.nav-list{display:flex;align-items:center;gap:2px;list-style:none;margin:0;padding:0}
.desktop-nav{margin-left:4px}
.nav-link{display:inline-flex;align-items:center;gap:6px;height:36px;padding:0 10px;border-radius:var(--r-pill);font-size:var(--text-sm);font-weight:var(--weight-medium);color:var(--muted);text-decoration:none;white-space:nowrap;transition:background-color var(--hover-time),color var(--hover-time)}
.nav-link svg{width:16px;height:16px;flex:none}
.nav-link:hover{color:var(--ink);background:var(--ink-04)}
.nav-link[aria-current="page"]{color:var(--ink);background:var(--panel);box-shadow:0 0 0 1px var(--border),0 4px 10px -6px var(--tint-24)}
.nav-tools{display:flex;align-items:center;gap:10px;margin-left:auto;flex:none}
.language-control{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:36px;min-width:44px;width:auto;padding:0 12px;border:1px solid var(--border);border-radius:var(--r-pill);background:var(--transparent);font-family:var(--font-body);font-size:13.5px;color:var(--muted);transition:border-color var(--hover-time),color var(--hover-time)}
.lang span{white-space:nowrap}
.lang svg{width:15px;height:15px}
.lang:hover{color:var(--ink);border-color:var(--ink-16)}
.language-menu{position:absolute;top:calc(100% + 8px);right:0;width:180px;padding:8px;border:1px solid var(--border);border-radius:var(--r-lg);background:var(--panel);box-shadow:var(--shadow-float)}
.language-menu a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-sm);color:var(--ink);text-decoration:none}
.language-menu a:hover,.language-menu a[aria-current="true"]{background:var(--panel-2)}
.login{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:38px;padding:0 18px 0 14px;border-radius:var(--r-pill);background:var(--ink);color:var(--white);font-size:var(--text-sm);font-weight:var(--weight-strong);text-decoration:none;white-space:nowrap;transition:background-color var(--hover-time)}
.login svg{width:16px;height:16px}
.login:hover{background:var(--ink-hover)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--panel)}
.menu-toggle svg{width:20px;height:20px}
.mobile-drawer{display:none;position:absolute;top:100%;left:0;right:0;padding:16px var(--gutter) 24px;background:var(--panel);border-bottom:1px solid var(--border);box-shadow:var(--shadow-float);max-height:calc(100dvh - var(--chrome-h));overflow-y:auto;overscroll-behavior:contain}
.mobile-drawer ul{list-style:none;margin:0;padding:0}
.mobile-drawer a{display:flex;align-items:center;gap:10px;width:100%;min-height:44px;height:auto;padding:12px 16px;border-radius:var(--r-sm);color:var(--ink);text-decoration:none}
.mobile-drawer svg{width:18px;height:18px}
.drawer-languages{margin-top:16px;padding-top:16px;border-top:1px solid var(--border)}
.nav-veil{position:fixed;inset:var(--chrome-h) 0 0;z-index:10;border:0;background:var(--ink-16)}
#site-header{position:relative;z-index:30}
.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:1.25fr 1fr 1fr 1fr;gap:32px}
.footer-grid>*{min-width:0}
.footer-brand p{margin-top:20px;color:var(--muted);font-size:var(--text-sm);max-width:320px}
.footer-title{margin:0 0 16px;font-size:var(--text-sm);font-weight:var(--weight-bold)}
.footer-links{display:grid;gap:4px;list-style:none;margin:0;padding:0}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;color:var(--muted);font-size:var(--text-sm);text-decoration:none}
.footer-links a:hover{color:var(--accent-dark)}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;margin-top:40px;padding-top:20px;border-top:1px solid var(--border);font-size:var(--text-xs);color:var(--muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.footer-legal a{display:inline-flex;align-items:center;min-height:24px;color:var(--muted)}
.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}
[data-count]{display:inline-block;min-width:3ch;font-variant-numeric:tabular-nums;font-family:var(--font-mono)}
#server-status{position:static;display:block;min-width:0;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status>*{min-width:0;max-width:100%}
#server-status+*{margin-top:32px}
@media(max-width:1180px){
  .nav .wrap{gap:16px}
  .nav-link{padding-inline:7px;font-size:13px}
}
@media(max-width:1040px){
  .desktop-nav{display:none}
  .menu-toggle{display:inline-flex}
  .mobile-drawer:not([hidden]){display:block}
  .nav-tools{margin-left:auto}
}
@media(max-width:768px){
  :root{--gutter:20px;--text-h2:28px;--text-h3:21px}
  h1{font-size:clamp(28px,8.8vw,40px)}
  .section{padding-top:48px;padding-bottom:48px}
  .announce{font-size:12.5px}
  .announce .wrap{flex-wrap:wrap;gap:4px 10px;height:auto;padding-top:8px;padding-bottom:8px}
  .btn{height:48px;min-width:140px;padding-inline:22px}
  .btn-small{height:40px;min-width:0}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .panel{padding:20px}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  .shell,.decorated-section{max-width:100%;overflow-x:clip}
  .nav .wrap{gap:8px}
  .nav-tools{gap:6px;margin-left:auto}
  .lang{padding-inline:9px}
  .lang span{display:none}
  .brand-zh{display:none}
  .footer-grid{grid-template-columns:1fr}
}
@media(max-width:360px){
  :root{--gutter:16px}
  .brand-en{font-size:17px}
  .login{padding-inline:12px}
  .login svg{display:none}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none}
}