:root{
  --c-bg:#F5F0E6;--c-bg-top:#F8F4EC;--c-bg-bottom:#F1EADD;--c-panel:#FFFDF8;--c-card:#FFFFFF;--c-panel-2:#EDE6D8;--c-panel-3:#F5F0E7;
  --c-border:#DDD3C2;--c-border-soft:#E9E2D5;--c-guide:#E2D9C9;--c-mark:#B3A690;
  --c-accent:#353128;--c-accent-top:#4A443A;--c-accent-dark:#1F1C16;--c-text:#231E17;--c-muted:#75695A;
  --c-success:#3C7A4E;--c-success-ring:rgba(60,122,78,.18);--c-warn:#B7791F;--c-error:#B23B2E;
  --c-on-accent:#FFFDF8;--c-on-accent-soft:rgba(255,253,248,.78);
  --hi-white:rgba(255,255,255,.92);--hi-accent:rgba(255,255,255,.18);--hi-accent-edge:rgba(255,255,255,.07);
  --ink-04:rgba(53,49,40,.04);--ink-06:rgba(53,49,40,.06);--ink-10:rgba(53,49,40,.10);--ink-14:rgba(53,49,40,.14);--ink-24:rgba(53,49,40,.24);--ink-40:rgba(53,49,40,.40);--flag-edge:rgba(35,30,23,.14);
  --flag-white:#FFFFFF;--flag-sg-red:#E3323E;--flag-us-red:#B3303A;--flag-us-blue:#3A3C69;--flag-jp-red:#BC1F34;--flag-hk-red:#D5302A;--flag-it-green:#1E8A4B;--flag-it-red:#C7313A;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei","Malgun Gothic",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei","Malgun Gothic",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --fs-display:64px;--fs-lead:20px;--fs-body:18px;--fs-small:14px;--fs-section:40px;--weight-display:800;--tracking-display:-.035em;
  --r-xl:20px;--r-lg:14px;--r-md:10px;--r-sm:8px;--r-xs:6px;--r-flag:4px;--r-pill:999px;--r-round:50%;
  --frame:1280px;--gutter:24px;--header-height:80px;--anchor-gap:96px;--toc-height:68px;
  --shadow-panel:inset 0 1px 0 var(--hi-white),0 36px 72px -36px var(--ink-10),0 12px 32px -18px var(--ink-10),0 1px 3px var(--ink-04);
  --shadow-card:inset 0 1px 0 var(--hi-white),0 18px 32px -22px var(--ink-14),0 2px 5px var(--ink-04);
  --gradient-ink:linear-gradient(180deg,var(--c-accent-top),var(--c-accent));
  --ease-ui:cubic-bezier(.2,.7,.3,1);--time-ui:.18s;--time-reveal:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-gap);scroll-behavior:smooth}
body{margin:0;background:var(--c-bg);color:var(--c-text);font-family:var(--font-body);font-size:var(--fs-body);line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
html.nav-open{overflow:hidden}
[hidden]{display:none!important}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
a,button,summary{ -webkit-tap-highlight-color:var(--ink-10)}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--c-accent);outline-offset:3px}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
button svg,a svg{vertical-align:middle}
h1,h2,h3,h4,p{margin:0}
h1,h2,h3{font-family:var(--font-display);text-wrap:balance}
h1{font-weight:var(--weight-display);font-size:clamp(52px,5vw,64px);line-height:1.1;letter-spacing:-.02em}
h2{font-size:var(--fs-section);font-weight:800;line-height:1.2;letter-spacing:-.02em}
h3{font-size:24px;line-height:1.3;letter-spacing:-.015em}
ul,ol{padding-left:1.4em}
p+p{margin-top:16px}
code{font-family:var(--font-mono);font-size:.87em;overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--c-panel-2);border:1px solid var(--c-border);border-radius:var(--r-md)}
pre code{overflow-wrap:normal;white-space:pre}
:where(main,section,article,div,nav,aside){min-width:0}
.mono{font-family:var(--font-mono);font-feature-settings:"zero" 0;font-variant-numeric:tabular-nums}
.no-break{white-space:nowrap}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.muted{color:var(--c-muted)}
.wrap{max-width:var(--frame);margin-inline:auto;padding-inline:var(--gutter);position:relative}
.section{padding-top:80px;padding-bottom:80px}
.section-head{margin-bottom:32px}
.section-head h2{margin-top:20px}
.section-head p{margin-top:16px;color:var(--c-muted)}
.center{text-align:center}
.stack{display:grid;gap:24px}
.grid-three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.card,.panel{background:var(--c-panel);border:1px solid var(--c-border);border-radius:var(--r-lg);box-shadow:var(--shadow-card);padding:28px}
.panel{border-radius:var(--r-xl);box-shadow:var(--shadow-panel)}
.prose{max-width:800px;margin-inline:auto}
.prose p,.prose li{overflow-wrap:anywhere}
.prose h2{margin-top:48px;margin-bottom:20px;font-size:32px}
.prose h3{margin-top:32px;margin-bottom:16px}
.prose a{text-decoration:underline;text-underline-offset:4px}
.prose li+li{margin-top:8px}
.page{position:relative;min-height:100vh;max-width:100%;overflow-x:clip;background:linear-gradient(180deg,var(--c-bg-top) 0,var(--c-bg-bottom) 900px,var(--c-bg) 1100px)}
.page::before,.page::after{content:"";position:absolute;top:0;bottom:0;width:1px;background:var(--c-guide);pointer-events:none;z-index:0}
.page::before{left:calc(50% - 640px)}
.page::after{left:calc(50% + 639px)}
.cross{position:absolute;width:17px;height:17px;transform:translate(-50%,-50%);pointer-events:none;z-index:3}
.cross::before,.cross::after{content:"";position:absolute;background:var(--c-mark)}
.cross::before{left:8px;top:0;width:1px;height:17px}
.cross::after{top:8px;left:0;width:17px;height:1px}
.cross--bl{left:0;top:calc(100% + .5px)}
.cross--br{left:100%;top:calc(100% + .5px)}
.cross--tl{left:0;top:0}
.cross--tr{left:100%;top:0}
.section-rule{position:relative;border-bottom:1px solid var(--c-guide)}
.decor-region{position:relative;overflow-x:clip}
.decor-mark{position:absolute;inset:12px auto auto 12px;width:17px;height:17px;color:var(--c-mark);pointer-events:none}
.btn,.btn-primary,.btn-secondary,.btn-main,.btn-sub,.btn-login{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:10px 22px;border:1px solid var(--c-border);border-radius:var(--r-pill);font-size:16px;font-weight:600;text-align:center;line-height:1.4;flex-shrink:0;white-space:nowrap;transition:transform var(--time-ui) var(--ease-ui),box-shadow var(--time-ui) var(--ease-ui)}
.btn-primary,.btn-main,.btn-login{background:var(--gradient-ink);color:var(--c-on-accent);border-color:var(--c-accent);box-shadow:inset 0 1px 0 var(--hi-accent),inset 0 0 0 1px var(--hi-accent-edge),0 16px 28px -16px var(--ink-40),0 2px 4px var(--ink-10)}
.btn,.btn-secondary,.btn-sub{background:var(--c-panel-3);color:var(--c-text);box-shadow:inset 0 1px 0 var(--hi-white)}
:where(.btn,.btn-primary,.btn-secondary,.btn-main,.btn-sub,.btn-login):hover{transform:translateY(-1px)}
:where(.btn,.btn-primary,.btn-secondary,.btn-main,.btn-sub,.btn-login):active{transform:translateY(0)}
:where(.btn,.btn-primary,.btn-secondary):disabled,:where(.btn,.btn-primary,.btn-secondary)[aria-disabled="true"]{background:var(--c-panel-2);color:var(--c-muted);box-shadow:none;transform:none}
.btn svg,.btn-primary svg,.btn-secondary svg{width:18px;height:18px}
.btn-main{display:flex;height:54px;font-size:17px;letter-spacing:.01em;border:0}
.btn-main svg{width:18px;height:18px}
.btn-sub{display:flex;height:48px;font-size:16px;font-weight:500}
.btn-sub svg{width:15px;height:15px;color:var(--c-muted)}
.btn-login{height:38px;min-height:38px;padding:0 14px 0 18px;font-size:14.5px;gap:6px}
.btn-login svg{width:15px;height:15px}
.topbar{position:relative;z-index:30;border-bottom:1px solid var(--c-guide)}
.topbar__inner{height:var(--header-height);display:flex;align-items:center;gap:24px;padding-inline:48px}
.brand{display:inline-flex;align-items:center;gap:9px;flex:none;min-height:28px}
.brand__mark{width:28px;height:28px;display:block}
.brand__word{font-family:var(--font-display);font-weight:800;font-size:21px;letter-spacing:-.03em;color:var(--c-text)}
.brand__zh{font-size:14px;font-weight:500;color:var(--c-muted)}
.mainnav{flex:1;display:flex;justify-content:center;min-width:0}
.mainnav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px}
.mainnav a{display:inline-flex;align-items:center;justify-content:center;height:36px;padding:0 6px;border-radius:var(--r-pill);font-size:14.5px;font-weight:500;color:var(--c-muted);white-space:nowrap}
.mainnav a:hover{color:var(--c-text)}
.nav-more{position:relative}
.nav-more-toggle{display:flex;align-items:center;height:36px;padding:0 6px;border:0;background:none;font:inherit;font-size:14.5px;color:var(--c-muted);white-space:nowrap;cursor:pointer}
.nav-more .language-panel{width:240px}
.mainnav .nav-more a{display:flex;justify-content:flex-start;min-height:44px;padding:8px 12px}
.mainnav a[aria-current="page"]{background:var(--c-panel-2);color:var(--c-text);font-weight:600;box-shadow:inset 0 0 0 1px var(--c-border),inset 0 1px 0 var(--hi-white)}
.topbar__end{display:flex;align-items:center;gap:14px;flex-shrink:0;margin-left:auto}
.language{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;height:36px;padding:0 10px;font-size:14px;color:var(--c-muted);border:0;background:none;border-radius:var(--r-pill);white-space:nowrap}
.lang span{white-space:nowrap}
.lang:hover{color:var(--c-text)}
.lang svg{width:16px;height:16px}
.language-panel{position:absolute;right:0;top:calc(100% + 8px);z-index:60;width:180px;padding:8px;background:var(--c-panel);border:1px solid var(--c-border);border-radius:var(--r-md);box-shadow:var(--shadow-panel)}
.language-panel a{display:flex;align-items:center;width:100%;min-height:44px;padding:8px 12px;font-size:14px;border-radius:var(--r-sm)}
.language-panel a:hover,.language-panel a[aria-current]{background:var(--c-panel-2)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:10px;border:1px solid var(--c-border);border-radius:var(--r-md);background:var(--c-panel);color:var(--c-accent)}
.menu-toggle svg{width:20px;height:20px}
.mobile-drawer{display:none}
.menu-veil{display:none}
.site-footer{position:relative;border-top:1px solid var(--c-guide);background:var(--c-bg-bottom)}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:40px;padding-top:56px;padding-bottom:40px}
.footer-brand p{margin-top:18px;max-width:360px;font-size:14px;color:var(--c-muted)}
.footer-title{font-size:14px;font-weight:700;margin-bottom:12px}
.footer-links{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 16px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;font-size:14px}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{text-decoration:underline;text-underline-offset:4px}
.footer-languages{display:flex;flex-wrap:wrap;gap:12px 24px;padding-top:20px;padding-bottom:20px;border-top:1px solid var(--c-border)}
.footer-languages a[aria-current]{font-weight:700}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;padding-top:20px;padding-bottom:28px;border-top:1px solid var(--c-border);font-size:13px;color:var(--c-muted)}
.footer-legal{display:flex;gap:20px;flex-wrap:wrap}
.reveal{transition:opacity var(--time-reveal) var(--ease-ui),transform var(--time-reveal) var(--ease-ui)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-height:120px;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:24px}
#server-status+*{margin-top:24px}
@media(max-width:1300px){.page::before,.page::after,.cross{display:none}}
@media(max-width:1180px) and (min-width:769px){
  .topbar__inner{height:auto;min-height:var(--header-height);flex-wrap:wrap;padding:14px 24px;row-gap:10px}
  .mainnav{order:3;flex-basis:100%;justify-content:flex-start;overflow-x:auto}
}
@media(max-width:768px){
  :root{--gutter:20px;--header-height:68px;--anchor-gap:84px;--fs-section:30px}
  h1{font-size:36px}
  .section{padding-top:48px;padding-bottom:48px}
  .grid-three{grid-template-columns:minmax(0,1fr)}
  .topbar__inner{height:var(--header-height);padding-inline:16px;gap:10px;flex-wrap:nowrap}
  .brand__word{font-size:19px}
  .mainnav{display:none}
  .topbar__end{margin-left:auto;gap:6px}
  .lang span{display:none}
  .lang{padding-inline:6px}
  .btn-login{padding-inline:13px;min-height:38px}
  .menu-toggle{display:inline-flex}
  .mobile-drawer{position:fixed;top:var(--header-height);right:0;left:0;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;z-index:28;background:var(--c-panel);padding:16px var(--gutter) 32px;border-top:1px solid var(--c-border)}
  .mobile-drawer:not([hidden]){display:block}
  .mobile-drawer ul{list-style:none;padding:0;margin:0}
  .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:46px;padding:10px 16px;border-radius:var(--r-md);font-size:16px}
  .mobile-drawer a[aria-current],.mobile-drawer a:hover{background:var(--c-panel-2);color:var(--c-text)}
  .drawer-languages{border-top:1px solid var(--c-border);margin-top:16px;padding-top:16px}
  .menu-veil{position:fixed;inset:var(--header-height) 0 0;z-index:27;background:var(--ink-24);border:0}
  .menu-veil:not([hidden]){display:block}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:28px}
  .footer-bottom{align-items:flex-start;flex-direction:column}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  .decor-region [aria-hidden="true"]{max-width:100%}
  .card,.panel{padding:22px}
  .prose h2{font-size:28px}
  .brand__mark{width:25px;height:25px}
  .brand__word{font-size:18px}
  .topbar__inner{gap:6px}
  .topbar__end{gap:2px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}