:root{
  color-scheme:light;
  --bg:#E5EBF2;--bg-panel:#F6F8FB;--bg-panel-2:#D8E0EA;--border:#C9D3DF;--border-strong:#B3BFCE;
  --accent:#A9611E;--accent-deep:#93531A;--accent-dark:#7E4612;--text:#18202B;--text-muted:#586474;--text-soft:#808B9B;
  --success:#2F7D5B;--warn:#C48A12;--error:#B23A3A;--white:#FFFFFF;--on-accent:#FFF8F1;--transparent:transparent;
  --hero-top:#EEF2F7;--hero-bottom:#DCE3EC;--panel-tint:#EDF1F6;--card-top:#FBFCFD;--bar-top:#F9FAFC;--bar-bottom:#EDF1F5;--wall-card:#DEE5EE;--chip-soft:#E6EBF1;
  --line-soft:rgba(24,32,43,.09);--win-ring:rgba(24,32,43,.10);--ink-line:rgba(24,32,43,.55);
  --hilite:rgba(255,255,255,.78);--hilite-soft:rgba(255,255,255,.45);--hilite-warm:rgba(255,236,214,.38);
  --glass:rgba(246,248,251,.74);--veil:rgba(24,32,43,.30);--accent-glow:rgba(169,97,30,.055);--accent-tint:rgba(169,97,30,.10);--accent-tint-2:rgba(169,97,30,.24);--success-tint:rgba(47,125,91,.16);
  --shadow-copper-10:rgba(169,97,30,.10);--shadow-copper-12:rgba(169,97,30,.12);--shadow-copper-14:rgba(169,97,30,.14);--shadow-copper-35:rgba(169,97,30,.35);--shadow-ink:rgba(24,32,43,.08);--shadow-ink-2:rgba(24,32,43,.14);
  --dot-red:#DE6159;--dot-amber:#DDA83C;--dot-green:#52A66E;--dot-ring:rgba(24,32,43,.18);
  --flag-red:#C9352B;--flag-blue:#2A4079;--flag-white:#FFFFFF;--flag-edge:rgba(24,32,43,.16);
  --oil-sky-1:#EEF1F6;--oil-sky-2:#DCE2EC;--oil-sky-3:#CBD5E2;--oil-apricot:#F1D5BA;--oil-far-1:#B9C4D6;--oil-far-2:#D0D8E4;--oil-vio-1:#9EA4BC;--oil-vio-2:#BCC1D2;--oil-rid-1:#6F7D96;--oil-rid-2:#98A3B7;--oil-lake-1:#C5D0DC;--oil-lake-2:#8A9BB1;--oil-shore-1:#5A6B75;--oil-shore-2:#7D9095;--oil-mist:#F5F7FB;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",Menlo,Consolas,"Noto Sans SC",monospace;
  --r-xs:6px;--r-sm:8px;--r-md:10px;--r-lg:12px;--r-pill:999px;--r-round:50%;
  --gutter:40px;--wrap-width:1360px;--reading-width:800px;--header-height:64px;--anchor-offset:80px;--toc-offset:144px;
  --size-display:64px;--size-h2:36px;--size-h3:22px;--size-body:16px;--size-small:14px;
  --weight-display:500;--weight-bold:600;--ease:ease;--fast:.2s;--reveal-time:.35s;
  --panel-shadow:inset 0 1px 0 var(--hilite),0 28px 64px -32px var(--shadow-copper-10);
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
body{font-family:var(--font-body);font-size:var(--size-body);line-height:1.6;color:var(--text);background:var(--bg);-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:disabled{cursor:not-allowed}
button{background:var(--transparent);border:0}
a,button,summary{touch-action:manipulation}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
ul,ol,dl{list-style:none}
[hidden]{display:none!important}
h1,h2,h3{font-family:var(--font-display);font-weight:var(--weight-display);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,5vw,68px);line-height:1.1;letter-spacing:-.02em}
h2{font-size:var(--size-h2);line-height:1.25;letter-spacing:-.02em}
h3{font-size:var(--size-h3);line-height:1.4}
p{overflow-wrap:break-word}
code{font-family:var(--font-mono);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}
.wrap{width:100%;max-width:var(--wrap-width);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:var(--reading-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:64px;padding-bottom:64px}
.section-head{margin-bottom:28px}
.section-head p{margin-top:12px;color:var(--text-muted);max-width:760px}
.no-break{white-space:nowrap}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.text-link{color:var(--accent);display:inline-flex;align-items:center;min-height:24px;gap:6px}
.text-link:hover{text-decoration:underline;text-underline-offset:4px}
.panel,.card{min-width:0;border:1px solid var(--border);border-radius:var(--r-lg);background:var(--bg-panel);box-shadow:var(--panel-shadow);padding:24px}
.grid{display:grid;gap:20px}
.grid>*{min-width:0}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-five{grid-template-columns:repeat(5,minmax(0,1fr))}
.stack>*+*{margin-top:20px}
.prose{min-width:0;overflow-wrap:break-word}
.prose h2{margin-top:48px;margin-bottom:20px}
.prose h3{margin-top:28px;margin-bottom:12px}
.prose p,.prose ul,.prose ol{margin-bottom:20px}
.prose ul{list-style:disc;padding-left:24px}
.prose ol{list-style:decimal;padding-left:24px}
.prose li+li{margin-top:8px}
.prose a{color:var(--accent);text-decoration:underline;text-underline-offset:3px}
.prose strong{font-weight:var(--weight-bold)}
.prose section[id]{scroll-margin-top:var(--anchor-offset)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:9px 22px;border-radius:var(--r-pill);font-size:15.5px;font-weight:500;white-space:nowrap;flex-shrink:0;border:1px solid var(--transparent);transition:transform var(--fast) var(--ease),box-shadow var(--fast) var(--ease),border-color var(--fast) var(--ease)}
.btn-primary{color:var(--on-accent);background:linear-gradient(180deg,var(--accent),var(--accent-deep));box-shadow:inset 0 1px 0 var(--hilite-warm),0 12px 26px -12px var(--shadow-copper-35)}
.btn-primary:hover,.btn-primary.is-hover{transform:translateY(-1px);background:var(--accent-dark);box-shadow:inset 0 1px 0 var(--hilite-warm),0 16px 30px -12px var(--shadow-copper-35)}
.btn-primary:active,.btn-primary.is-active{transform:translateY(0);background:var(--accent-dark)}
.btn-ghost,.btn-secondary{color:var(--text);background:var(--glass);border-color:var(--border);box-shadow:inset 0 1px 0 var(--hilite)}
.btn-ghost:hover,.btn-secondary:hover{border-color:var(--border-strong)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--bg-panel-2);color:var(--text-muted);border-color:var(--border);box-shadow:none;transform:none;pointer-events:none}
.btn.is-focus{outline:2px solid var(--accent);outline-offset:3px}
.btn-arrow{font-size:15px}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:20px}
.site-header,#site-header{position:relative;z-index:60;border-bottom:1px solid var(--line-soft)}
.nav{display:flex;align-items:center;height:var(--header-height);gap:28px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none;font-weight:600;font-size:17px;letter-spacing:-.01em;color:var(--text);min-height:28px}
.brand-mark{width:28px;height:28px;flex:none;display:block}
.brand-zh{font-weight:400;color:var(--text-muted)}
.desktop-nav{flex:1;min-width:0;height:100%}
.tabs{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:26px;height:100%;justify-content:center}
.tabs li{height:100%;flex:none}
.tabs a{position:relative;display:flex;align-items:center;height:100%;font-size:14px;color:var(--text-muted);white-space:nowrap;transition:color var(--fast) var(--ease)}
.tabs a::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:2px;border-radius:var(--r-xs);background:var(--text);transform:scaleX(0);transform-origin:center;opacity:0;transition:transform .25s ease,opacity .25s ease}
.tabs a:hover{color:var(--text)}
.tabs a:hover::after{transform:scaleX(.5);opacity:.35}
.tabs a[aria-current="page"]{color:var(--text);font-weight:500}
.tabs a[aria-current="page"]::after{transform:scaleX(1);opacity:1}
.nav-end{display:flex;align-items:center;gap:10px;flex-shrink:0}
.lang-switch{position:relative;flex:none}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:4px;min-height:34px;min-width:44px;width:auto;padding:0 10px;border-radius:var(--r-sm);font-size:14px;color:var(--text-muted);white-space:nowrap}
.lang span{white-space:nowrap}
.lang:hover{background:var(--glass)}
.lang-caret{font-size:11px}
.lang-panel{display:none;position:absolute;right:0;top:calc(100% + 10px);z-index:90;min-width:172px;padding:6px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--bg-panel);box-shadow:var(--panel-shadow)}
.lang-switch.is-open .lang-panel{display:block}
.lang-panel a{display:flex;align-items:center;min-height:40px;padding:8px 12px;border-radius:var(--r-xs);white-space:nowrap;font-size:14px}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--bg-panel-2)}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:34px;padding:0 18px;border-radius:var(--r-pill);background:var(--text);color:var(--bg-panel);font-size:14px;font-weight:500;box-shadow:inset 0 1px 0 var(--hilite-soft);transition:transform var(--fast) var(--ease);white-space:nowrap}
.login:hover{transform:translateY(-1px)}
.menu-toggle{display:none;min-width:44px;min-height:44px;align-items:center;justify-content:center;flex-direction:column;gap:4px;border-radius:var(--r-sm);color:var(--text)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-xs)}
.menu-toggle[aria-expanded="true"]{background:var(--bg-panel-2)}
.mobile-drawer{display:none}
.nav-veil{display:none}
html.nav-open{overflow:hidden}
.drawer-languages{border-top:1px solid var(--border);margin-top:12px;padding-top:12px}
.site-footer,#site-footer{border-top:1px solid var(--border);background:var(--panel-tint)}
.footer-grid{display:grid;grid-template-columns:1.35fr 1fr 1fr 1fr;gap:40px;padding-top:48px;padding-bottom:40px}
.footer-grid>*{min-width:0}
.footer-brand p{color:var(--text-muted);font-size:14px;max-width:290px;margin-top:16px}
.footer-heading{font-size:14px;font-weight:600;margin-bottom:12px}
.footer-links{display:flex;flex-direction:column;gap:6px}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;font-size:14px;color:var(--text-muted);overflow-wrap:anywhere}
.footer-links a:hover{color:var(--text)}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;border-top:1px solid var(--border);padding-top:20px;padding-bottom:24px;font-size:13px;color:var(--text-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.footer-legal a{display:inline-flex;min-height:24px;align-items:center}
.reveal{transition:opacity var(--reveal-time) ease,transform var(--reveal-time) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-width:0;max-width:100%;min-height:80px;overflow:hidden;margin-top:24px;margin-bottom:24px}
#server-status>*{min-width:0;max-width:100%}
#server-status+*{margin-top:24px}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.decorated,.hero,.stage{overflow-x:clip;max-width:100%}
@media(max-width:1280px){.nav{gap:18px}.tabs{gap:18px}.tabs a{font-size:13.5px}}
@media(max-width:1180px){.tabs{gap:12px}.nav{gap:14px}.lang{padding-inline:7px}}
@media(max-width:1080px){
  .desktop-nav{display:none}.nav-end{margin-left:auto}.menu-toggle{display:inline-flex}
  .mobile-drawer{position:fixed;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;background:var(--bg-panel);padding:20px var(--gutter) 40px;z-index:70}
  .mobile-drawer.is-open{display:block}
  .mobile-drawer a{display:flex;width:100%;align-items:center;min-height:44px;padding:10px 14px;border-radius:var(--r-sm);color:var(--text)}
  .mobile-drawer a:hover,.mobile-drawer a[aria-current]{background:var(--bg-panel-2)}
  .nav-veil{position:fixed;top:var(--header-height);inset-inline:0;bottom:0;background:var(--veil);z-index:65}
  .nav-veil.is-open{display:block}
}
@media(max-width:768px){
  h1{font-size:40px}
  h2{font-size:28px}
  .grid-three{grid-template-columns:1fr}.grid-five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px}
}
@media(max-width:640px){
  :root{--gutter:20px;--size-h2:28px;--size-h3:20px}
  .no-break{white-space:normal}
  h1{font-size:36px;line-height:1.2}
  .section{padding-top:40px;padding-bottom:40px}
  .nav{gap:8px}.brand{font-size:15px;gap:7px}.nav-end{gap:4px;margin-left:auto}
  .lang{font-size:12px;padding-inline:6px}.login{padding-inline:12px;font-size:13px}
  .brand-mark{width:25px;height:25px}
  .panel,.card{padding:20px}
  .tilt,[data-tilt]{transform:none}
  .decorated,.hero,.stage{max-width:100%}
}
@media(max-width:360px){
  :root{--gutter:16px}
  .brand{font-size:14px;gap:5px}.brand-mark{width:22px;height:22px}
  .lang{font-size:11px;padding-inline:4px}.login{padding-inline:10px}
  .nav-end{gap:2px}
  .footer-grid{grid-template-columns:1fr}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  *,*::before,*::after{transition-duration:0s!important}
}