:root{
  color-scheme:light;
  --bg:#FCFCFD;
  --bg-panel:#FFFFFF;
  --bg-panel-2:#F2F3F6;
  --bg-soft:#F8F9FB;
  --border:#E3E5EB;
  --border-soft:#EDEFF3;
  --accent:#2D5BE3;
  --accent-dark:#1E3FA8;
  --accent-2:#5A82F2;
  --text:#15171C;
  --ink-2:#2A2D35;
  --text-muted:#5E6370;
  --text-display-2:#7C818D;
  --success:#1E9E62;
  --warn:#C98A0B;
  --error:#D2402F;
  --accent-a00:rgba(45,91,227,0);
  --accent-a03:rgba(45,91,227,.03);
  --accent-a06:rgba(45,91,227,.06);
  --accent-a10:rgba(45,91,227,.10);
  --accent-a14:rgba(45,91,227,.14);
  --accent-a18:rgba(45,91,227,.18);
  --accent-a40:rgba(45,91,227,.40);
  --success-a12:rgba(30,158,98,.12);
  --success-a28:rgba(30,158,98,.28);
  --ink-side:#111318;
  --ink-side-0:rgba(17,19,24,0);
  --on-dark:rgba(255,255,255,.66);
  --white-0:rgba(255,255,255,0);
  --white-a14:rgba(255,255,255,.14);
  --white-a30:rgba(255,255,255,.30);
  --white-a90:rgba(255,255,255,.90);
  --ink-a04:rgba(21,23,28,.04);
  --ink-a06:rgba(21,23,28,.06);
  --ink-a10:rgba(21,23,28,.10);
  --ink-a32:rgba(21,23,28,.32);
  --flag-red:#C8323A;
  --flag-white:#FFFFFF;
  --flag-navy:#1F3A7A;
  --flag-blue:#2450A4;
  --r-xs:6px;
  --r-sm:8px;
  --r-md:12px;
  --r-lg:14px;
  --r-xl:22px;
  --r-pill:999px;
  --r-round:50%;
  --r-control:10px;
  --r-icon:9px;
  --r-line:2px;
  --r-flag:3px;
  --font-display:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans','Apple SD Gothic Neo','Microsoft YaHei',system-ui,sans-serif;
  --font-body:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans','Malgun Gothic','Microsoft YaHei',system-ui,sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,'SF Mono',Menlo,Consolas,monospace;
  --shadow-window:inset 0 1px 0 var(--white-a90),0 1px 2px var(--ink-a06),0 24px 56px -22px var(--accent-a18),0 64px 120px -40px var(--accent-a10);
  --shadow-float:inset 0 1px 0 var(--white-a90),0 2px 6px var(--ink-a06),0 18px 40px -14px var(--accent-a18);
  --shadow-button:inset 0 1px 0 var(--white-a14),0 2px 4px var(--ink-a10),0 12px 26px -12px var(--ink-a32);
  --gutter:44px;
  --content-width:1288px;
  --header-height:64px;
  --anchor-offset:88px;
  --toc-offset:88px;
  --section-anchor:164px;
  --ease:cubic-bezier(.2,.7,.3,1);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
html,body{margin:0;min-width:0}
body{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,a,summary{-webkit-tap-highlight-color:var(--accent-a10)}
button{border:0}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
[hidden]{display:none!important}
img,svg{vertical-align:middle}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
p{margin:0 0 1em}
h1,h2,h3,h4{font-family:var(--font-display);line-height:1.25;text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,4.5vw,72px);font-weight:900;letter-spacing:-.02em}
h2{font-size:clamp(28px,3vw,40px);font-weight:800;letter-spacing:-.02em}
h3{font-size:22px;font-weight:700}
ul,ol{padding-left:1.4em}
code{font-family:var(--font-mono);font-size:.88em;overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--bg-panel-2)}
pre code{overflow-wrap:normal;white-space:pre}
table{border-collapse:collapse}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:72px;padding-bottom:72px}
.section-head{max-width:740px;margin-bottom:32px}
.section-head p{color:var(--text-muted)}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-five{grid-template-columns:repeat(5,minmax(0,1fr))}
.no-break{white-space:nowrap}
.text-muted{color:var(--text-muted)}
.text-accent{color:var(--accent)}
.mono{font-family:var(--font-mono)}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.icon{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.card,.panel{min-width:0;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-md);padding:24px;box-shadow:inset 0 1px 0 var(--white-a90),0 12px 32px -24px var(--accent-a18)}
.panel-raised{box-shadow:var(--shadow-window)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:52px;padding:10px 26px;border:1px solid var(--border);border-radius:var(--r-lg);font-size:16.5px;font-weight:700;white-space:nowrap;flex-shrink:0;transition:transform .2s ease,box-shadow .2s ease,background .2s ease}
.btn svg{display:block;width:20px;height:20px}
.btn-primary{background:linear-gradient(180deg,var(--ink-2),var(--text));color:var(--bg-panel);border-color:var(--text);box-shadow:var(--shadow-button)}
.btn-primary:hover{transform:translateY(-1px);background:var(--ink-2)}
.btn-ghost,.btn-secondary{background:var(--bg-panel);color:var(--text);box-shadow:0 1px 2px var(--ink-a04)}
.btn-ghost:hover,.btn-secondary:hover{border-color:var(--text-display-2)}
.btn:active{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.5;cursor:not-allowed;transform:none}
.btn-small{min-height:40px;padding:8px 16px;font-size:14px}
.link{color:var(--accent);text-decoration:underline;text-underline-offset:4px}
.notice{background:var(--bg-panel-2);border-bottom:1px solid var(--border-soft)}
.notice-link{display:flex;align-items:center;justify-content:center;gap:8px;min-height:36px;font-size:13.5px;letter-spacing:.005em;padding:4px 16px;text-align:center}
.notice-link strong{font-weight:700}
.notice-sep{color:var(--text-display-2)}
.notice-arrow{display:inline-block;margin-left:2px;transition:transform .2s ease}
.notice-link:hover .notice-arrow{transform:translateX(3px)}
#site-header{position:relative;z-index:60}
.topbar{background:var(--bg);border-bottom:1px solid var(--border-soft);position:relative;z-index:50}
.topbar-in{display:flex;align-items:stretch;height:var(--header-height);gap:28px;flex-wrap:nowrap}
.brand{display:flex;align-items:center;gap:10px;flex:none;min-height:44px}
.logo-mark{display:block;flex:none;width:32px;height:32px}
.brand-en{font-family:var(--font-display);font-weight:800;font-size:19px;letter-spacing:-.02em}
.brand-zh{font-size:13.5px;font-weight:500;color:var(--text-muted);padding-left:10px;border-left:1px solid var(--border);line-height:16px}
.tabs{flex:1;min-width:0;display:flex;justify-content:center;overflow:visible}
.tabs::-webkit-scrollbar{display:none}
.tabs ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px}
.tabs li{height:100%;flex-shrink:0}
.tabs a{position:relative;display:flex;align-items:center;height:100%;padding:0 9px;font-size:14.5px;font-weight:500;color:var(--text-muted);white-space:nowrap;transition:color .2s ease}
.tabs a::after{content:"";position:absolute;left:12px;right:12px;bottom:-1px;height:2px;border-radius:var(--r-line);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.is-active{color:var(--text);font-weight:600}
.tabs a.is-active::after{transform:scaleX(1)}
.topbar-end{display:flex;align-items:center;gap:8px;flex-shrink:0}
.language{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:38px;min-width:44px;width:auto;padding:0 10px;border-radius:var(--r-sm);font-size:14px;background:var(--bg);color:var(--text-muted);font-weight:500;white-space:nowrap}
.lang span{white-space:nowrap}
.lang:hover{background:var(--bg-panel-2);color:var(--text)}
.lang svg{display:block;width:16px;height:16px}
.lang-panel{position:absolute;right:0;top:calc(100% + 10px);z-index:70;min-width:180px;padding:8px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-float)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-xs)}
.lang-panel a:hover,.lang-panel a[aria-current]{background:var(--bg-panel-2);color:var(--accent)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;min-height:38px;padding:0 18px;border-radius:var(--r-control);background:var(--text);color:var(--bg-panel);font-size:14.5px;font-weight:600;box-shadow:inset 0 1px 0 var(--white-a14),0 1px 2px var(--ink-a10);white-space:nowrap}
.btn-login:hover{background:var(--ink-2)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;border-radius:var(--r-sm);background:var(--bg-panel-2)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-line)}
.menu-toggle[aria-expanded="true"]{color:var(--accent)}
.mobile-drawer{position:fixed;z-index:45;top:var(--header-height);inset-inline:0;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(--bg-panel)}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-bottom:1px solid var(--border-soft)}
.mobile-drawer a.is-active{color:var(--accent);background:var(--accent-a06)}
.drawer-languages{display:grid;margin-top:16px;border-top:1px solid var(--border)}
.nav-veil{position:fixed;z-index:40;inset:var(--header-height) 0 0;background:var(--ink-a32)}
html.nav-open{overflow:hidden}
.site-footer{background:var(--bg-panel-2);border-top:1px solid var(--border);padding-top:48px;padding-bottom:24px}
.footer-grid{display:grid;grid-template-columns:1.25fr 1fr 1fr;gap:48px}
.footer-brand p{margin-top:18px;color:var(--text-muted);max-width:330px}
.footer-title{margin:0 0 14px;font-size:14px;font-weight:700}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 16px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:32px;font-size:14px;color:var(--text-muted)}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--accent)}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:32px;padding-top:20px;border-top:1px solid var(--border)}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;margin-top:20px;font-size:13px;color:var(--text-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.reveal{transition:opacity .35s var(--ease),transform .35s 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:120px;overflow:hidden;margin-block:24px}
#server-status+*{margin-top:32px}
.prose{max-width:820px;min-width:0}
.prose p,.prose li{overflow-wrap:break-word}
.prose h2{margin-top:2em}
.prose a{color:var(--accent);text-decoration:underline;text-underline-offset:3px}
.prose li+li{margin-top:8px}
body:has(.toc-tabs) section[id]{scroll-margin-top:var(--section-anchor)}
.atmosphere,.decoration-host{position:relative;overflow-x:clip;max-width:100%}
@media(min-width:1101px){
  .mobile-drawer,.nav-veil{display:none}
}
@media(max-width:1200px){
  .topbar-in{gap:16px}
  .tabs a{padding-inline:9px;font-size:14px}
  .brand-zh{display:none}
}
@media(max-width:1100px){
  :root{--gutter:28px}
  .topbar .tabs{display:none}
  .topbar-end{margin-left:auto}
  .menu-toggle{display:flex}
  .footer-grid{gap:28px}
}
@media(max-width:768px){
  h1{font-size:clamp(28px,6vw,40px)}
  .section{padding-top:48px;padding-bottom:48px}
  .grid-three{grid-template-columns:1fr}
  .grid-five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:640px){
  :root{--gutter:20px}
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  .atmosphere,.decoration-host{max-width:100%;overflow-x:clip}
  .notice-link{font-size:11px;gap:4px;flex-wrap:wrap}
  .topbar-in{gap:8px}
  .brand{gap:7px}
  .brand-en{font-size:16px}
  .logo-mark{width:28px;height:28px}
  .topbar-end{gap:4px;margin-left:auto}
  .lang{padding-inline:6px;font-size:12px}
  .btn-login{padding-inline:12px;font-size:13px}
  .footer-grid{grid-template-columns:1fr}
  .footer-brand{grid-column:auto}
  .card,.panel{padding:20px}
}
@media(max-width:380px){
  :root{--gutter:16px}
  .lang span{max-width:4em;overflow:hidden}
  .brand{gap:5px}
  .brand-en{font-size:15px}
  .logo-mark{width:26px;height:26px}
  .btn-login{padding-inline:10px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}