:root{
  --bg:#F8F2E7;--bg-top:#FCF8F0;--bg-bottom:#F2E9D9;
  --panel:#FFFCF6;--panel-2:#F1E8D8;--panel-2-hi:#F6EFE3;--panel-side:#FAF5EB;--panel-a60:rgba(255,252,246,.62);
  --border:#E4D8C4;--border-2:#D5C6AD;--accent:#1E1712;--accent-dark:#0B0806;--accent-soft:#3B2E24;
  --text:#2A2119;--muted:#75695B;--faint:#A69986;--success:#2E8B57;--warn:#C98516;--error:#B8432F;--dot-off:#BDB09C;
  --ring-g:rgba(46,139,87,.16);--ring-o:rgba(201,133,22,.18);--ring-n:rgba(189,176,156,.28);
  --on-accent:#FFFCF6;--on-accent-70:rgba(255,252,246,.72);--on-accent-20:rgba(255,252,246,.16);
  --hl:rgba(255,255,255,.85);--hl-glow:rgba(255,253,248,.92);
  --ink-04:rgba(30,23,18,.04);--ink-06:rgba(30,23,18,.06);--ink-10:rgba(30,23,18,.10);--ink-14:rgba(30,23,18,.14);--ink-40:rgba(59,46,36,.42);
  --tl-red:#E0604A;--tl-amber:#E2A33B;--tl-green:#5AA56D;
  --badge-1:#5F7890;--badge-2:#C98516;--badge-3:#2E8B57;
  --flag-red:#C9302C;--flag-blue:#283C78;--flag-gold:#E3B23C;--flag-black:#211913;--flag-white:#FFFDF8;
  --clear:transparent;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-sm:6px;--r-md:8px;--r-lg:10px;--r-win:14px;--r-pill:999px;--r-round:50%;--r-flag:3px;--r-tag:5px;--r-chip:7px;
  --shadow-win:0 0 0 1px var(--border),inset 0 1px 0 var(--hl),0 2px 6px var(--ink-04),0 18px 40px -20px var(--ink-10),0 48px 110px -36px var(--ink-10);
  --shadow-float:0 0 0 1px var(--border),inset 0 1px 0 var(--hl),0 4px 10px -4px var(--ink-06),0 18px 36px -14px var(--ink-14);
  --shadow-sub:0 0 0 1px var(--border),inset 0 1px 0 var(--hl),0 12px 26px -16px var(--ink-14);
  --grain:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 .24 0 0 0 0 .17 0 0 0 0 .11 0 0 0 .03 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
  --gutter:32px;--wrap-width:1200px;--header-edge:96px;--anchor-space:88px;
  --display-size:68px;--display-weight:800;--title-tracking:-.03em;--body-size:16px;--body-leading:1.75;
  --space-section:80px;--ease-out:cubic-bezier(.2,.7,.2,1);--time-fast:.15s;--time-reveal:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-space);scroll-behavior:smooth}
html.nav-open{overflow:hidden}
body{margin:0;font:400 var(--body-size)/var(--body-leading) var(--font-body);color:var(--text);background-color:var(--bg);background-image:var(--grain);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
a{color:inherit;text-underline-offset:4px}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button,a,input,summary,select,textarea{-webkit-tap-highlight-color:var(--ink-10)}
button{color:inherit}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
[hidden]{display:none!important}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--text);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--display-size);font-weight:var(--display-weight);line-height:1.1;letter-spacing:var(--title-tracking);margin:0 0 24px}
h2{font-size:36px;line-height:1.25;letter-spacing:-.02em;margin:0 0 24px}
h3{font-size:22px;line-height:1.4;margin:0 0 16px}
p{margin:0 0 20px}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:var(--r-sm)}
code{font-family:var(--font-mono);overflow-wrap:anywhere;font-size:.9em}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--panel-2);border:1px solid var(--border);border-radius:var(--r-md)}
pre code{overflow-wrap:normal;white-space:pre}
.wrap{max-width:var(--wrap-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--space-section);padding-bottom:var(--space-section)}
.section-head{max-width:760px;margin-bottom:32px}
.section-head p,.muted{color:var(--muted)}
.no-break{white-space:nowrap}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.ico{fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.icon{width:24px;height:24px;flex-shrink:0}
.symbol-bank{position:absolute;width:0;height:0;overflow:hidden}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid>*{min-width:0}
.panel,.card{min-width:0;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:inset 0 1px 0 var(--hl),0 18px 40px -24px var(--ink-10);padding:24px}
.panel--well{background:var(--panel-2)}
.prose{max-width:800px;min-width:0;overflow-wrap:break-word}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose li{margin-bottom:8px}
.prose img{display:block;border-radius:var(--r-md)}
.decorated{position:relative;overflow-x:clip}
#server-status{position:relative;display:block;min-height:80px;max-width:100%;overflow:hidden;margin-block:24px}
#server-status + *{margin-top:32px}
.reveal{transition:opacity var(--time-reveal) var(--ease-out),transform var(--time-reveal) var(--ease-out)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.cta{display:flex;justify-content:center;gap:12px;margin-bottom:18px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:46px;padding:0 22px;border:0;border-radius:var(--r-lg);font:600 15.5px/1 var(--font-body);text-decoration:none;white-space:nowrap;flex-shrink:0;transition:transform var(--time-fast) ease,box-shadow var(--time-fast) ease}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn--ghost,.btn-secondary{background:var(--panel);color:var(--text);box-shadow:0 0 0 1px var(--border-2),inset 0 1px 0 var(--hl),0 3px 8px -4px var(--ink-10)}
.btn--solid,.btn-primary{background:linear-gradient(180deg,var(--accent-soft) 0%,var(--accent) 52%,var(--accent-dark) 100%);color:var(--on-accent);box-shadow:0 0 0 1px var(--accent-dark),inset 0 1px 0 var(--on-accent-20),0 10px 22px -10px var(--ink-40)}
.btn--solid:hover,.btn-primary:hover{box-shadow:0 0 0 1px var(--accent-dark),inset 0 1px 0 var(--on-accent-20),0 14px 26px -10px var(--ink-40)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.5;cursor:not-allowed;transform:none;pointer-events:none}
.notice-off{position:absolute;opacity:0;pointer-events:none;width:1px;height:1px}
.notice-off:checked + .notice{display:none}
.notice{position:relative;min-height:36px;display:flex;align-items:center;justify-content:center;padding:6px 52px;background:var(--accent);color:var(--on-accent);font-size:13.5px;line-height:1.5;text-align:center}
.notice__text{text-decoration:none;font-weight:500;letter-spacing:.01em}
.notice__arrow{display:inline-block;margin-left:6px;transition:transform .2s ease}
.notice__text:hover .notice__arrow{transform:translateX(3px)}
.notice__x{position:absolute;right:14px;top:50%;width:28px;height:28px;margin-top:-14px;display:grid;place-items:center;border:0;padding:0;border-radius:var(--r-sm);background:var(--clear);color:var(--on-accent-70);cursor:pointer}
.notice__x:hover{background:var(--on-accent-20);color:var(--on-accent)}
.notice__x:focus-visible{outline-color:var(--on-accent)}
.notice-off:focus-visible + .notice .notice__x{outline:2px solid var(--on-accent);outline-offset:1px}
#site-header{position:relative;z-index:80}
.topbar{position:relative;z-index:83;background-color:var(--bg-top);background-image:var(--grain);border-bottom:1px solid var(--border)}
.topbar__in{height:60px;display:flex;align-items:center;gap:28px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:9px;text-decoration:none;color:var(--text);flex-shrink:0;min-height:34px}
.brand__mark{display:block;width:30px;height:30px}
.brand__en{font:800 18px/1 var(--font-display);letter-spacing:-.02em}
.brand__zh{font:500 13px/1 var(--font-body);color:var(--muted);padding-left:9px;border-left:1px solid var(--border-2)}
.menu{flex:1;min-width:0}
.menu ul{display:flex;align-items:center;justify-content:center;list-style:none;margin:0;padding:0;gap:0}
.menu li{display:flex;align-items:center;flex-shrink:0}
.menu li + li::before{content:"·";color:var(--faint);margin:0 6px;font-weight:700}
.menu a{display:inline-flex;align-items:center;min-height:32px;font-size:14px;color:var(--muted);text-decoration:none;padding:6px 2px;white-space:nowrap;transition:color var(--time-fast) ease}
.menu a:hover{color:var(--text)}
.menu a[aria-current="page"]{color:var(--accent);font-weight:650}
.topbar__end{display:flex;align-items:center;gap:10px;flex-shrink:0;margin-left:auto}
.lang-wrap{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;height:34px;padding:0 10px;border:0;border-radius:var(--r-md);background:var(--clear);color:var(--muted);font:500 13.5px/1 var(--font-body)}
.lang__txt{white-space:nowrap}
.lang:hover{background:var(--panel-2);color:var(--text)}
.lang-panel{position:absolute;right:0;top:calc(100% + 10px);z-index:90;min-width:180px;padding:6px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--panel);box-shadow:var(--shadow-float)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;text-decoration:none;border-radius:var(--r-sm)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel-2)}
.login{display:inline-flex;align-items:center;justify-content:center;height:34px;padding:0 16px;border-radius:var(--r-md);background:var(--panel);color:var(--text);font:600 14px/1 var(--font-body);text-decoration:none;box-shadow:0 0 0 1px var(--border-2),inset 0 1px 0 var(--hl),0 2px 6px -3px var(--ink-10)}
.login:hover{box-shadow:0 0 0 1px var(--muted),inset 0 1px 0 var(--hl),0 4px 10px -4px var(--ink-14)}
.nav-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border:0;border-radius:var(--r-md);background:var(--clear);color:var(--text)}
.nav-toggle svg{width:22px;height:22px}
.nav-toggle[aria-expanded="true"]{background:var(--panel-2)}
.nav-drawer{position:fixed;inset-inline:0;top:var(--header-edge);height:calc(100dvh - var(--header-edge));max-height:calc(100dvh - var(--header-edge));z-index:82;overflow-y:auto;overscroll-behavior:contain;background:var(--panel);padding:16px var(--gutter) 40px}
.nav-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 14px;text-decoration:none;border-bottom:1px solid var(--border)}
.nav-drawer a[aria-current]{font-weight:700;background:var(--panel-2)}
.drawer-languages{margin-top:24px;border-top:1px solid var(--border)}
.nav-veil{position:fixed;inset:var(--header-edge) 0 0;z-index:81;border:0;background:var(--ink-40)}
.site-footer{border-top:1px solid var(--border);background-color:var(--panel-2);background-image:var(--grain);padding-top:56px;padding-bottom:28px}
.footer-grid{display:grid;grid-template-columns:1.25fr 1fr 1fr;gap:40px}
.footer-grid>*{min-width:0}
.footer-brand p{max-width:320px;margin-top:18px;color:var(--muted);font-size:14px}
.footer-title{font-size:14px;font-weight:700;margin:0 0 12px}
.footer-links{display:flex;flex-wrap:wrap;gap:8px 20px;list-style:none;margin:0;padding:0}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;font-size:13px;text-decoration:none;color:var(--muted)}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--text);text-decoration:underline}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:28px;padding-top:20px;border-top:1px solid var(--border)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;margin-top:20px;font-size:12px;color:var(--muted)}
.footer-bottom p{margin:0}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
@media(max-width:1180px){
  .brand__zh{display:none}
  .topbar__in{gap:16px}
  .menu li + li::before{margin-inline:6px}
}
@media(max-width:1024px){
  .topbar__in{gap:12px}
  .menu{display:none}
  .topbar__end{margin-left:auto}
  .nav-toggle{display:inline-flex}
  .grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(min-width:1025px){.nav-drawer,.nav-veil{display:none!important}}
@media(max-width:768px){
  :root{--gutter:20px;--display-size:38px;--space-section:56px;--title-tracking:-.02em}
  h2{font-size:28px}
  h3{font-size:20px}
  .notice{font-size:12.5px;padding:6px 44px}
  .footer-grid{grid-template-columns:1fr;gap:24px}
  .section-head{margin-bottom:24px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none!important}
  .decorated{max-width:100%}
  .grid{grid-template-columns:minmax(0,1fr)}
  .cta{flex-wrap:wrap}
  .cta .btn{flex:1 1 140px}
  .topbar__in{gap:8px}
  .topbar__end{gap:4px;margin-left:auto}
  .brand{gap:6px}
  .brand__en{font-size:16px}
  .brand__mark{width:26px;height:26px}
  .login{padding-inline:12px;font-size:13px}
  .lang{padding-inline:6px}
  .lang__txt{display:none}
  .panel,.card{padding:20px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}