:root{
  --bg:#FCF7EF;
  --bg-top:#FEFAF4;
  --bg-bottom:#F6ECDF;
  --panel:#FFFDF9;
  --panel-2:#F6E9DA;
  --groove:#F3E7D8;
  --soft:#FBF3E8;
  --paper:#FFFFFF;
  --border:#EADCC9;
  --border-soft:#F0E5D6;
  --bezel:rgba(246,233,218,.62);
  --accent:#E66A3C;
  --accent-dark:#BF4E24;
  --accent-tint:rgba(230,106,60,.08);
  --accent-line:rgba(230,106,60,.34);
  --on-accent:#FFFDF9;
  --text:#2E2A26;
  --ink-soft:#4A433C;
  --muted:#7A6E62;
  --faint:#A3968A;
  --success:#3E8B52;
  --success-tint:#E8F2E7;
  --success-line:rgba(62,139,82,.24);
  --violet:#5A5FC4;
  --violet-tint:#ECECFA;
  --violet-line:rgba(90,95,196,.24);
  --warn:#C98A1A;
  --error:#C2412D;
  --doodle:#E8D9C4;
  --doodle-ink:#E3CFB3;
  --tape:rgba(232,217,196,.78);
  --titlebar-end:#FAF2E7;
  --dot-1:#E4D1BA;
  --dot-2:#EAD9C5;
  --dot-3:#EFE3D3;
  --flag-red:#D42A2F;
  --flag-navy:#22296A;
  --flag-white:#FFFFFF;
  --flag-edge:rgba(46,42,38,.14);
  --shadow-06:rgba(230,106,60,.06);
  --shadow-10:rgba(230,106,60,.10);
  --shadow-12:rgba(230,106,60,.12);
  --shadow-cta:rgba(230,106,60,.42);
  --shadow-ink:rgba(46,42,38,.06);
  --veil:rgba(46,42,38,.22);
  --transparent:transparent;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","Inter","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --fs-xs:12px;
  --fs-sm:14px;
  --fs-body:16px;
  --fs-lede:20px;
  --fs-h1:64px;
  --fs-h2:36px;
  --fs-h3:24px;
  --weight-body:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --tracking-display:-.03em;
  --tracking-cjk:-.02em;
  --r-window:24px;
  --r-bezel:32px;
  --r-card:14px;
  --r-feature:28px;
  --r-toast:14px;
  --r-note:10px;
  --r-item:8px;
  --r-tag:6px;
  --r-flag:4px;
  --r-small:2px;
  --r-circle:50%;
  --r-pill:999px;
  --gutter:40px;
  --content-width:1200px;
  --header-height:72px;
  --anchor-offset:88px;
  --toc-offset:152px;
  --space-section:80px;
  --ease:ease;
  --time-fast:.18s;
  --time-reveal:.36s;
  --shadow-panel:0 24px 48px var(--shadow-10),0 70px 110px -40px var(--shadow-12);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--fs-body);font-weight:var(--weight-body);line-height:1.75;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
[hidden]{display:none!important}
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(--violet);text-underline-offset:4px}
button,a,input,select,textarea,summary,[tabindex]{-webkit-tap-highlight-color:var(--accent-tint)}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--violet);outline-offset:4px}
button:disabled,.btn[aria-disabled="true"]{opacity:.55;cursor:not-allowed}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:var(--weight-bold);line-height:1.25;text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,4.45vw,var(--fs-h1));line-height:1.12;letter-spacing:var(--tracking-display)}
h2{font-size:var(--fs-h2);letter-spacing:var(--tracking-cjk)}
h3{font-size:var(--fs-h3);letter-spacing:var(--tracking-cjk)}
p{margin:0 0 1.25em}
ul,ol{padding-left:1.4em}
li+li{margin-top:.25em}
pre{max-width:100%;overflow-x:auto;background:var(--groove);border:1px solid var(--border);border-radius:var(--r-card);padding:20px;font-family:var(--font-mono)}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere;word-break:break-word}
pre code{overflow-wrap:normal;word-break:normal;white-space:pre}
blockquote{margin:24px 0}
hr{border:0;border-top:1px solid var(--border);margin:32px 0}
.no-break{white-space:nowrap}
.wrap,.shell{width:100%;margin-inline:auto;padding-inline:var(--gutter)}
.wrap{max-width:calc(var(--content-width) + var(--gutter)*2)}
.shell{max-width:1320px}
.section{padding-top:var(--space-section);padding-bottom:var(--space-section)}
.section-head{max-width:760px;margin-bottom:32px}
.section-head h2{margin:0 0 16px}
.section-head p{color:var(--muted)}
.reading-wrap{max-width:880px;margin-inline:auto;padding-inline:var(--gutter)}
.prose{min-width:0;overflow-wrap:break-word}
.prose h2{margin-top:1.8em}
.prose h3{margin-top:1.5em}
.prose li{margin-bottom:.5em}
.grid{display:grid;gap:24px}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
:where(.grid,.grid-2,.grid-3)>*{min-width:0}
.panel,.card{background:var(--panel);border:1px solid var(--border);border-radius:var(--r-window);padding:28px;min-width:0}
.panel-apricot{background:var(--panel-2)}
.panel-groove{background:var(--groove)}
.muted{color:var(--muted)}
.eyebrow{font-size:var(--fs-sm);font-weight:var(--weight-semibold);color:var(--muted)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:50px;max-width:100%;border:0;border-radius:var(--r-pill);font-family:var(--font-body);font-size:var(--fs-body);font-weight:var(--weight-semibold);line-height:1.2;text-decoration:none;white-space:nowrap;flex-shrink:0;transition:transform var(--time-fast) var(--ease),background-color var(--time-fast) var(--ease),box-shadow var(--time-fast) var(--ease)}
.btn svg{width:17px;height:17px;flex:none}
.btn-primary{padding:0 26px 0 30px;background:var(--accent);color:var(--on-accent);box-shadow:0 14px 26px -14px var(--shadow-cta),0 2px 0 var(--accent-dark)}
.btn-primary:hover{background:var(--accent-dark);transform:translateY(-1px)}
.btn-ghost,.btn-secondary{padding:0 26px;border:1.5px solid var(--text);color:var(--text);background:var(--transparent)}
.btn-ghost:hover,.btn-secondary:hover{background:var(--panel);transform:translateY(-1px)}
.btn:active{transform:translateY(1px)}
.btn-small{height:38px;padding-inline:20px;font-size:var(--fs-sm)}
.btn[aria-disabled="true"]{pointer-events:none}
.ico{width:15px;height:15px;flex:none;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.ico-fill,.pf-fill{fill:currentColor;stroke:none}
.topbar{position:relative;z-index:40}
.topbar-in{display:flex;align-items:center;min-height:var(--header-height);gap:44px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);flex:none;min-height:32px}
.brand img{width:32px;height:32px;flex:none}
.brand-en{font-family:var(--font-display);font-weight:var(--weight-bold);font-size:18px;letter-spacing:var(--tracking-cjk)}
.brand-zh{font-size:var(--fs-sm);font-weight:var(--weight-medium);color:var(--muted)}
.main-nav{flex:1;min-width:0}
.nav-links{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:26px}
.nav-links li{margin:0;flex:none}
.nav-links a{display:block;padding-block:8px;font-size:14.5px;font-weight:var(--weight-medium);color:var(--muted);text-decoration:none;white-space:nowrap;transition:color var(--time-fast) var(--ease)}
.nav-links a:hover{color:var(--text)}
.nav-links a[aria-current="page"]{color:var(--text);font-weight:var(--weight-bold)}
.nav-end{display:flex;align-items:center;gap:20px;flex-shrink:0;margin-left:auto}
.lang-wrap{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:5px;min-height:32px;min-width:24px;width:auto;font:inherit;font-size:var(--fs-sm);color:var(--muted);background:none;border:0;padding:0;white-space:nowrap}
.lang span{white-space:nowrap}
.lang:hover{color:var(--text)}
.lang-panel{position:absolute;right:0;top:calc(100% + 12px);z-index:60;min-width:176px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-card);box-shadow:0 16px 40px var(--shadow-12)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-item);color:var(--text);text-decoration:none}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--groove)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;height:38px;padding:0 20px;border-radius:var(--r-pill);border:1.5px solid var(--text);font-size:var(--fs-sm);font-weight:var(--weight-semibold);color:var(--text);text-decoration:none;white-space:nowrap;transition:background-color var(--time-fast) var(--ease),color var(--time-fast) var(--ease)}
.btn-login:hover{background:var(--text);color:var(--panel)}
.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-pill);background:var(--panel);color:var(--text)}
.menu-icon{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round}
.mobile-drawer{position:fixed;top:var(--header-height);left:0;right:0;z-index:42;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);padding:16px var(--gutter) 32px;border-top:1px solid var(--border)}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:10px 12px;border-radius:var(--r-item);color:var(--text);text-decoration:none}
.mobile-drawer a[aria-current="page"],.mobile-drawer a:hover{background:var(--groove);font-weight:var(--weight-semibold)}
.drawer-languages{margin-top:20px;padding-top:16px;border-top:1px solid var(--border)}
.drawer-languages a[aria-current="true"]{background:var(--soft)}
.menu-veil{position:fixed;top:var(--header-height);bottom:0;left:0;right:0;z-index:41;background:var(--veil);border:0}
html.nav-open{overflow:hidden}
.site-footer{background:var(--groove);border-top:1px solid var(--border);padding-top:56px;padding-bottom:28px}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:48px}
.footer-brand p{max-width:340px;margin-top:18px;color:var(--muted);font-size:var(--fs-sm)}
.footer-heading{margin:0 0 16px;font-size:var(--fs-body);font-weight:var(--weight-bold)}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));list-style:none;padding:0;margin:0;gap:8px 20px}
.footer-links li{margin:0;min-width:0}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;color:var(--ink-soft);font-size:var(--fs-sm);text-decoration:none}
.footer-links a:hover{text-decoration:underline}
.footer-languages,.footer-legal{display:flex;align-items:center;flex-wrap:wrap;gap:8px 24px}
.footer-languages{margin-top:32px;padding-top:24px;border-top:1px solid var(--border)}
.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;color:var(--ink-soft);font-size:var(--fs-sm)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;margin-top:24px;font-size:var(--fs-xs);color:var(--muted)}
.footer-bottom p{margin:0}
.reveal{transition:opacity var(--time-reveal) var(--ease),transform var(--time-reveal) var(--ease)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{display:block;position:static;min-width:0;max-width:100%;min-height:120px;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status+*{margin-top:32px}
.decoration-scope,.stage{overflow-x:clip;max-width:100%}
@media(min-width:1181px) and (max-width:1500px){
  .topbar-in{gap:20px}
  .nav-links{gap:16px}
  .nav-links a{font-size:13px}
  .nav-end{gap:12px}
  .brand-en{font-size:16px}
}
@media(max-width:1180px){
  .topbar-in{gap:16px;height:var(--header-height);flex-wrap:nowrap}
  .main-nav{display:none}
  .nav-end{margin-left:auto;gap:12px}
  .menu-toggle{display:inline-flex}
  .static-header .topbar-in{height:auto;flex-wrap:wrap;padding-top:14px;padding-bottom:12px}
  .static-header .main-nav{display:block;order:3;flex:0 0 100%;overflow-x:auto}
  .static-header .nav-links{gap:22px}
}
@media(max-width:768px){
  :root{--gutter:20px;--space-section:48px;--fs-h2:28px;--fs-h3:22px}
  h1{font-size:34px;line-height:1.2}
  .grid-3,.grid-2{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:28px}
  .footer-bottom{align-items:flex-start;flex-direction:column}
  .panel,.card{padding:22px}
  .decoration-scope{max-width:100%}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,.note,[data-tilt]{transform:none}
  .brand-zh{display:none}
  .btn{height:46px;font-size:15px}
  .topbar-in{gap:8px}
  .brand{gap:6px}
  .brand img{width:26px;height:26px}
  .brand-en{font-size:14px}
  .nav-end{gap:6px;margin-left:auto}
  .btn-login{height:34px;padding-inline:12px;font-size:12px}
  .lang{font-size:12px}
  .menu-toggle{min-width:44px;min-height:44px}
}
@media(max-width:359px){
  :root{--gutter:16px}
  .brand-en{font-size:12px}
  .brand img{width:24px;height:24px}
  .nav-end{gap:3px}
  .btn-login{padding-inline:9px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none}
}