:root {
  --bg:#F4F3F1;
  --panel:#FFFFFF;
  --panel-2:#ECEAE7;
  --panel-side:#F7F6F4;
  --panel-soft:#FAF9F7;
  --border:#DEDAD6;
  --border-soft:#E8E5E1;
  --accent:#B0266A;
  --accent-dark:#861A50;
  --rose:#D9455E;
  --coral:#F4845F;
  --ember:#F26B3A;
  --text:#1E1A1D;
  --muted:#625B60;
  --faint:#948B90;
  --dot:#D3CDC8;
  --success:#1E8A5A;
  --warn:#B7791F;
  --error:#C7362F;
  --success-10:rgba(30,138,90,.10);
  --success-18:rgba(30,138,90,.18);
  --grid-line:rgba(30,26,29,.04);
  --ink-06:rgba(30,26,29,.06);
  --ink-10:rgba(30,26,29,.10);
  --accent-05:rgba(176,38,106,.05);
  --accent-08:rgba(176,38,106,.08);
  --accent-10:rgba(176,38,106,.10);
  --accent-12:rgba(176,38,106,.12);
  --accent-22:rgba(176,38,106,.22);
  --deep-35:rgba(134,26,80,.35);
  --deep-45:rgba(134,26,80,.45);
  --white-0:rgba(255,255,255,0);
  --white-22:rgba(255,255,255,.22);
  --white-35:rgba(255,255,255,.35);
  --white-55:rgba(255,255,255,.55);
  --white-60:rgba(255,255,255,.60);
  --white-78:rgba(255,255,255,.78);
  --white-90:rgba(255,255,255,.90);
  --on-dark:#FFFFFF;
  --on-dark-muted:rgba(255,255,255,.84);
  --flag-red:#C8202F;
  --flag-blue:#22306E;
  --flag-white:#FFFFFF;
  --r-sm:6px;
  --r-md:10px;
  --r-card:14px;
  --r-frame:20px;
  --r-xl:28px;
  --r-pill:999px;
  --font-display:'Iowan Old Style','Palatino Linotype',Palatino,Georgia,'Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',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;
  --hl:inset 0 1px 0 var(--white-90);
  --shadow-soft:0 16px 48px var(--accent-10);
  --shadow-chip:0 6px 18px var(--accent-08);
  --shadow-card:0 1px 2px var(--ink-06),0 14px 32px -18px var(--accent-22);
  --gutter:24px;
  --toc-offset:112px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:80px;scroll-behavior:smooth}
html.nav-open{overflow:hidden}
body{margin:0;background-color:var(--bg);background-image:linear-gradient(var(--grid-line) 1px,transparent 1px),linear-gradient(90deg,var(--grid-line) 1px,transparent 1px);background-size:44px 44px;color:var(--text);font-family:var(--font-body);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button,select,input{font:inherit}
button{cursor:pointer}
img,svg{max-width:100%}
svg{display:block;flex-shrink:0}
img{height:auto}
ul{list-style:none;margin:0;padding:0}
p{margin:0}
h1,h2,h3{line-height:1.2;text-wrap:balance}
h1{font-family:var(--font-display);font-size:clamp(52px,5vw,68px);font-weight:400;letter-spacing:-.02em}
h2{font-size:clamp(28px,3vw,40px);font-weight:400;letter-spacing:-.02em}
h3{font-size:clamp(20px,2vw,26px)}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:1200px;margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:88px;padding-bottom:88px}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
code{font-family:var(--font-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;border-radius:var(--r-md);background:var(--panel-2)}
pre code{overflow-wrap:normal}
:where(a,button,summary,select,input,[role="tab"]):focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-sm)}
.reveal{transition:opacity .55s ease,transform .55s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-width:176px;min-height:48px;padding:0 30px;border:1px solid transparent;border-radius:var(--r-sm);font-size:16px;font-weight:500;letter-spacing:.02em;white-space:nowrap;flex-shrink:0;transition:background-color .15s,box-shadow .15s}
.btn-primary{background:var(--accent);color:var(--on-dark);box-shadow:0 12px 26px -12px var(--deep-45),inset 0 1px 0 var(--white-22)}
.btn-primary:hover{background:var(--accent-dark)}
.btn-ghost,.btn-secondary{background:var(--white-60);color:var(--text);border:1.5px solid var(--text)}
.btn-ghost:hover,.btn-secondary:hover{background:var(--panel)}
.btn:disabled{opacity:.55;cursor:not-allowed;box-shadow:none}
.panel,.card{background:var(--panel);border:1px solid var(--border-soft);border-radius:var(--r-card);box-shadow:var(--shadow-card);min-width:0}
.announce{background:var(--accent-dark);color:var(--on-dark-muted);font-size:13px;line-height:18px}
.announce-in{display:flex;align-items:center;justify-content:center;gap:14px;flex-wrap:wrap;padding:9px 24px}
.announce-tag{background:var(--on-dark);color:var(--accent);font-weight:600;font-size:12px;letter-spacing:.14em;padding:2px 12px 2px 13px;border-radius:var(--r-pill)}
.announce-link{display:inline-flex;align-items:center;gap:4px;color:var(--on-dark);font-weight:600;min-height:24px}
.announce-link:hover{text-decoration:underline;text-underline-offset:3px}
.site-head{position:relative;z-index:30;background:var(--white-60);backdrop-filter:blur(10px);border-bottom:1px solid var(--border-soft)}
.head-in{display:flex;align-items:center;gap:32px;min-height:64px;max-width:1440px;margin:0 auto;padding:0 40px}
.brand{display:flex;align-items:center;gap:10px;flex:none;min-height:44px}
.brand img{width:30px;height:30px}
.brand-en{font-weight:600;font-size:18px;letter-spacing:.02em;color:var(--text)}
.brand-zh{font-size:13px;color:var(--muted);padding-left:10px;border-left:1px solid var(--border);line-height:16px}
.nav{flex:1;display:flex;justify-content:center;min-width:0}
.nav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0}
.nav li{display:flex;align-items:center;font-size:14px;white-space:nowrap}
.nav li+li::before{content:"·";color:var(--faint);margin:0 11px}
.nav a{position:relative;color:var(--muted);padding:6px 0;transition:color .15s}
.nav a:hover,.nav a[aria-current="page"]{color:var(--text)}
.nav a[aria-current="page"]{font-weight:500}
.nav a[aria-current="page"]::after{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;border-radius:var(--r-pill);background:var(--accent)}
.tools{display:flex;align-items:center;gap:14px;flex:none}
.lang-wrap{position:relative}
.lang{appearance:none;border:0;background:none;font:inherit;font-size:14px;color:var(--muted);display:inline-flex;align-items:center;gap:6px;min-height:44px;width:auto;padding:6px 4px;white-space:nowrap;cursor:pointer}
.lang:hover{color:var(--text)}
.lang-list{position:absolute;top:100%;right:0;z-index:4;min-width:150px;background:var(--panel);border:1px solid var(--border-soft);border-radius:var(--r-md);box-shadow:var(--shadow-soft);padding:6px}
.lang-list[hidden],.drawer[hidden]{display:none}
.lang-list a{display:flex;align-items:center;min-height:40px;padding:6px 12px;border-radius:var(--r-sm);white-space:nowrap}
.lang-list a:hover,.lang-list a[aria-current]{background:var(--accent-08)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;min-height:36px;padding:0 20px;border-radius:var(--r-sm);background:var(--text);color:var(--on-dark);font-size:14px;font-weight:500;white-space:nowrap;transition:background-color .15s}
.btn-login:hover{background:var(--accent-dark)}
.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);color:var(--text)}
.drawer{display:none}
.site-foot{background:var(--accent-dark);color:var(--on-dark-muted);padding-top:64px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px}
.foot-brand{display:flex;align-items:center;gap:10px;color:var(--on-dark);font-weight:600;font-size:20px}
.foot-brand img{width:32px;height:32px}
.foot-about{max-width:300px;margin-top:16px;font-size:14px}
.foot-title{color:var(--on-dark);font-weight:600;margin:0 0 16px}
.foot-list{display:grid;gap:5px}
.foot-list a{display:inline-flex;align-items:center;min-height:28px;font-size:14px}
.foot-list a:hover,.foot-bottom a:hover{text-decoration:underline}
.foot-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:14px;margin-top:52px;padding-top:20px;padding-bottom:24px;border-top:1px solid var(--white-22);font-size:13px}
.foot-bottom-links{display:flex;flex-wrap:wrap;gap:16px}
.prose{min-width:0;line-height:1.85}
.prose h2{margin:2em 0 .7em}
.prose h3{margin:1.5em 0 .6em}
.prose p,.prose ul,.prose ol{margin:0 0 1.2em}
.prose a:not(.btn){color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
.prose img{max-width:100%}
#server-status{position:relative;display:block;max-width:100%;overflow:hidden;margin-bottom:32px}
#server-status + *{margin-top:24px}
body:has(.toc-tabs) section[id]{scroll-margin-top:var(--toc-offset)}
@media(max-width:1180px){
  .head-in{padding-inline:24px;gap:20px}
  .nav li{font-size:13.5px}
  .nav li+li::before{margin-inline:8px}
  .brand-zh{display:none}
}
@media(max-width:1040px){
  .head-in{flex-wrap:wrap;padding:10px 20px;row-gap:4px}
  .nav{order:3;flex-basis:100%;justify-content:flex-start;overflow-x:auto}
  .tools{margin-left:auto}
  .foot-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:768px){
  h1{font-size:clamp(28px,6vw,40px)}
  .nav{display:none}
  .head-in{flex-wrap:nowrap}
  .tools{margin-left:auto;gap:6px}
  .menu-toggle{display:inline-flex}
  .drawer:not([hidden]){display:block;position:absolute;top:100%;left:0;right:0;z-index:3;background:var(--panel);border-bottom:1px solid var(--border);box-shadow:var(--shadow-soft);max-height:calc(100dvh - 64px);overflow-y:auto;overscroll-behavior:contain;padding:12px var(--gutter) 24px}
  .drawer ul{display:grid;list-style:none;margin:0;padding:0}
  .drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:10px 14px;border-radius:var(--r-sm)}
  .drawer a:hover,.drawer a[aria-current]{background:var(--accent-08);color:var(--accent-dark)}
  .drawer-label{display:block;padding:16px 14px 6px;color:var(--faint);font-size:12px}
  .drawer-languages{border-top:1px solid var(--border-soft);margin-top:10px}
  .lang-wrap{display:none}
  .sec{padding-top:64px;padding-bottom:64px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .announce{font-size:12px}
  .announce-in{gap:8px 10px;padding:8px 16px}
  .head-in{padding-inline:var(--gutter)}
  .btn-login{padding-inline:14px}
  .foot-grid{grid-template-columns:minmax(0,1fr);gap:28px}
  .reveal.pending{transform:none}
  .tilt-card,.tilt,.is-tilted{transform:none!important}
  .wrap,.sec,.hero,.stage{max-width:100%;overflow-x:clip}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}