:root{
  --bg:#F8F2E8;
  --bg-top:#FCF8F0;
  --bg-bottom:#F2EADB;
  --panel:#FFFCF6;
  --panel-2:#EFE6D6;
  --tabbar:#F3ECE1;
  --border:#E3D8C5;
  --border-strong:#D6C8B1;
  --accent:#1D5E74;
  --accent-dark:#14465A;
  --accent-2:#2A7A8E;
  --accent-soft:rgba(29,94,116,.08);
  --accent-line:rgba(29,94,116,.42);
  --apricot:#E0793B;
  --apricot-ring:rgba(224,121,59,.26);
  --text:#2A2219;
  --muted:#6E6255;
  --faint:#9A8D7D;
  --success:#2F8A5E;
  --warn:#C98516;
  --error:#C2412D;
  --on-accent:#FFFCF6;
  --on-accent-line:rgba(255,252,246,.42);
  --dot:rgba(42,34,25,.06);
  --dot-canvas:rgba(42,34,25,.075);
  --mask-solid:#000;
  --clear:transparent;
  --hl:rgba(255,255,255,.92);
  --hl-soft:rgba(255,255,255,.22);
  --veil:rgba(42,34,25,.28);
  --shadow-card:0 12px 28px -12px rgba(29,94,116,.16),0 2px 6px -2px rgba(42,34,25,.06);
  --shadow-chip:0 4px 10px -6px rgba(29,94,116,.18);
  --shadow-window:0 46px 90px -32px rgba(29,94,116,.18),0 18px 40px -20px rgba(29,94,116,.12),0 2px 8px rgba(42,34,25,.04);
  --shadow-plate:0 10px 24px -14px rgba(42,34,25,.18);
  --shadow-btn:0 10px 20px -10px rgba(29,94,116,.55);
  --shadow-inset:inset 0 1px 2px rgba(42,34,25,.05);
  --flag-red:#C8323A;
  --flag-white:#FFFDF8;
  --flag-navy:#1F3566;
  --flag-edge:rgba(42,34,25,.16);
  --r-xs:4px;
  --r-chip:5px;
  --r-s:6px;
  --r-node:7px;
  --r-m:8px;
  --r-l:11px;
  --r-pill:999px;
  --r-circle:50%;
  --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","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --weight-normal:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --size-body:17px;
  --size-display:64px;
  --size-h2:36px;
  --size-h3:22px;
  --size-small:14px;
  --leading-body:1.7;
  --leading-display:1.1;
  --tracking-display:-.03em;
  --tracking-cjk:-.02em;
  --gutter:32px;
  --content-width:1264px;
  --reading-width:824px;
  --header-height:64px;
  --anchor-offset:80px;
  --toc-offset:144px;
  --space-1:8px;
  --space-2:16px;
  --space-3:24px;
  --space-4:32px;
  --space-5:40px;
  --space-6:48px;
  --space-8:64px;
  --space-10:80px;
  --ease-out:cubic-bezier(.2,.7,.2,1);
  --duration-fast:.15s;
  --duration-reveal:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
body{margin:0;font-family:var(--font-body);font-size:var(--size-body);line-height:var(--leading-body);color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}
img,video{display:block;max-width:100%;height:auto}
svg{flex-shrink:0;vertical-align:middle}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
a{color:inherit;text-underline-offset:.2em}
button,a,summary,input,select,textarea{touch-action:manipulation}
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
button:disabled,.btn[aria-disabled="true"]{cursor:not-allowed;opacity:.55}
[hidden]{display:none!important}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:var(--weight-bold);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--size-display);line-height:var(--leading-display);letter-spacing:var(--tracking-display);margin:0 0 var(--space-3)}
h2{font-size:var(--size-h2);line-height:1.25;letter-spacing:var(--tracking-cjk);margin:0 0 var(--space-2)}
h3{font-size:var(--size-h3);line-height:1.4;margin:0 0 var(--space-2)}
:lang(zh-CN) h1,:lang(zh-TW) h1,:lang(ja) h1,:lang(ko) h1{letter-spacing:var(--tracking-cjk)}
p{margin:0 0 var(--space-3)}
ul,ol{padding-left:1.5em}
li+li{margin-top:.25em}
code{font-family:var(--font-mono);font-size:.88em;overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:var(--space-3);border:1px solid var(--border);border-radius:var(--r-m);background:var(--panel-2)}
pre code{overflow-wrap:normal;white-space:pre}
hr{border:0;border-top:1px solid var(--border);margin-block:var(--space-4)}
table{border-collapse:collapse}
th,td{word-break:keep-all}
section[id]{scroll-margin-top:var(--anchor-offset)}
body:has(.toc-tabs) section[id]{scroll-margin-top:var(--toc-offset)}
.no-break{white-space:nowrap}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.muted{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}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.wrap,.shell{width:100%;max-width:var(--content-width);padding-inline:var(--gutter);margin-inline:auto}
.reading-wrap{width:100%;max-width:var(--reading-width);padding-inline:var(--gutter);margin-inline:auto}
.section{padding-top:var(--space-10);padding-bottom:var(--space-10)}
.section-head{max-width:824px;margin-bottom:var(--space-5)}
.section-head p{color:var(--muted);font-size:19px}
.grid{display:grid;gap:var(--space-3)}
.grid>*{min-width:0}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-five{grid-template-columns:repeat(5,minmax(0,1fr))}
.panel,.card{min-width:0;border:1px solid var(--border);border-radius:var(--r-m);background:var(--panel);box-shadow:inset 0 1px 0 var(--hl),var(--shadow-card);padding:var(--space-3)}
.card p:last-child,.panel p:last-child{margin-bottom:0}
.dotted{position:relative;overflow-x:clip;background-image:radial-gradient(circle,var(--dot) 1.5px,var(--clear) 1.9px);background-size:22px 22px}
.prose{min-width:0;overflow-wrap:break-word}
.prose h2{margin-top:var(--space-6)}
.prose h3{margin-top:var(--space-4)}
.prose a{color:var(--accent)}
.prose li{margin-bottom:var(--space-1)}
.prose blockquote{margin-inline:0}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:12px;min-height:46px;padding:0 20px;
  border:1px solid var(--border-strong);border-radius:var(--r-m);font-size:15.5px;font-weight:var(--weight-semibold);
  line-height:1.2;text-decoration:none;white-space:nowrap;flex-shrink:0;
  transition:transform var(--duration-fast) ease,box-shadow var(--duration-fast) ease,border-color var(--duration-fast) ease;
}
.btn:has(.kbd){padding-right:10px}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn-primary{color:var(--on-accent);border-color:var(--accent-dark);background:linear-gradient(180deg,var(--accent-2) 0%,var(--accent) 52%,var(--accent-dark) 100%);box-shadow:inset 0 1px 0 var(--hl-soft),var(--shadow-btn)}
.btn-primary:hover{border-color:var(--accent)}
.btn-ghost,.btn-secondary{color:var(--text);background:var(--panel);box-shadow:inset 0 1px 0 var(--hl),var(--shadow-chip)}
.btn-ghost:hover,.btn-secondary:hover{border-color:var(--accent-line)}
.btn-text{background:var(--clear);color:var(--accent);border-color:var(--clear);box-shadow:none}
.btn-small{min-height:36px;font-size:var(--size-small);padding-inline:14px}
.btn svg{width:18px;height:18px}
.kbd{display:inline-grid;place-items:center;width:19px;height:19px;flex:none;border:1px solid var(--border-strong);border-radius:var(--r-xs);font-family:var(--font-mono);font-size:10.5px;font-weight:var(--weight-medium);line-height:1;color:var(--muted)}
.btn-primary .kbd{border-color:var(--on-accent-line);color:var(--on-accent)}
.cta-row{display:flex;align-items:center;justify-content:center;gap:12px;margin:0 0 16px}
.brand{display:inline-flex;align-items:center;gap:9px;flex:none;text-decoration:none;color:var(--text);font-family:var(--font-display);font-weight:var(--weight-bold);font-size:19px;letter-spacing:-.02em;line-height:1}
.brand img{width:26px;height:26px;flex:none}
.brand-zh{color:var(--muted);font-weight:var(--weight-medium)}
#site-header,.site-header{position:relative;z-index:60;min-height:var(--header-height)}
.header-bar{position:relative;z-index:63;height:var(--header-height)}
.header-bar>.shell,.site-header>.shell{height:100%;display:flex;align-items:center;gap:24px;flex-wrap:nowrap}
.desktop-nav{flex:1;min-width:0}
.nav-links{display:flex;align-items:center;justify-content:center;gap:2px;list-style:none;margin:0;padding:0}
.nav-links li{margin:0;flex:none}
.nav-links a{display:inline-flex;align-items:center;gap:6px;height:34px;padding:0 10px;border-radius:var(--r-s);font-size:14px;line-height:1;color:var(--muted);text-decoration:none;white-space:nowrap;transition:background-color var(--duration-fast) ease,color var(--duration-fast) ease}
.nav-links a svg{width:16px;height:16px;flex:none;color:var(--faint)}
.nav-links a:hover{color:var(--text);background:var(--panel-2)}
.nav-links a[aria-current="page"]{color:var(--text);font-weight:var(--weight-semibold)}
.nav-links a[aria-current="page"] svg{color:var(--accent)}
.nav-tools{display:flex;align-items:center;gap:10px;flex-shrink:0;margin-left:auto}
.lang-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;min-height:34px;padding:0 10px;border:0;border-radius:var(--r-s);background:var(--clear);font:inherit;font-size:14px;line-height:1;color:var(--muted)}
.lang span{white-space:nowrap}
.lang svg{width:15px;height:15px}
.lang:hover{background:var(--panel-2);color:var(--text)}
.lang-panel{display:none;position:absolute;z-index:80;right:0;top:calc(100% + 8px);min-width:176px;padding:8px;border:1px solid var(--border);border-radius:var(--r-m);background:var(--panel);box-shadow:var(--shadow-card)}
.lang-picker.is-open .lang-panel{display:block}
.lang-panel a{display:flex;align-items:center;min-height:40px;padding:8px 12px;text-decoration:none;font-size:14px;border-radius:var(--r-s)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--accent-soft);color:var(--accent)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:34px;padding:0 8px 0 14px;border:1px solid var(--border-strong);border-radius:var(--r-s);background:var(--panel);color:var(--text);font-size:14px;font-weight:var(--weight-semibold);line-height:1;text-decoration:none;white-space:nowrap;box-shadow:inset 0 1px 0 var(--hl),var(--shadow-chip)}
.btn-login:hover{border-color:var(--accent-line)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:10px;border:1px solid var(--border);border-radius:var(--r-s);background:var(--panel);color:var(--text)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-xs)}
.nav-drawer{display:none;position:fixed;top:var(--header-height);right:0;left:0;z-index:62;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));padding:16px var(--gutter) 32px;background:var(--panel);overflow-y:auto;overscroll-behavior:contain}
.nav-drawer a{display:flex;align-items:center;gap:10px;width:100%;min-height:44px;padding:12px 16px;border-radius:var(--r-s);text-decoration:none;font-size:15px}
.nav-drawer a svg{width:18px;height:18px}
.nav-drawer a:hover,.nav-drawer a[aria-current="page"],.nav-drawer a[aria-current="true"]{background:var(--accent-soft);color:var(--accent)}
.drawer-languages{border-top:1px solid var(--border);margin-top:16px;padding-top:16px}
.nav-veil{display:none;position:fixed;inset:var(--header-height) 0 0;z-index:61;border:0;background:var(--veil);width:100%}
html.nav-open{overflow:hidden}
.reveal{transition:opacity var(--duration-reveal) var(--ease-out),transform var(--duration-reveal) var(--ease-out)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-height:160px;max-width:100%;overflow:hidden;margin-top:var(--space-3);margin-bottom:var(--space-4)}
#server-status+*{margin-top:var(--space-4)}
.site-footer{padding-top:var(--space-8);padding-bottom:var(--space-4);background:var(--text);color:var(--on-accent)}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:var(--space-6)}
.footer-grid>*{min-width:0}
.site-footer .brand{color:var(--on-accent)}
.footer-intro{margin-top:var(--space-3);max-width:340px;font-size:15px;color:var(--border)}
.footer-title{font-size:15px;font-weight:var(--weight-semibold);margin:0 0 16px}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 16px;list-style:none;margin:0;padding:0}
.footer-links li{margin:0}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:32px;text-decoration:none;font-size:14px;color:var(--border)}
.site-footer a:hover{color:var(--on-accent);text-decoration:underline}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:32px;padding-top:24px;border-top:1px solid var(--muted)}
.footer-languages a[aria-current="true"]{color:var(--on-accent)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px 24px;margin-top:24px;font-size:13px;color:var(--border)}
.footer-bottom p{margin:0}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.fr{fill:var(--flag-red)}
.fw{fill:var(--flag-white)}
.fn{fill:var(--flag-navy)}
.sw{stroke:var(--flag-white);fill:none}
.sr{stroke:var(--flag-red);fill:none}
.fl{fill:none;stroke:var(--flag-edge);stroke-width:1}
@media(min-width:1101px) and (max-width:1280px){
  .header-bar>.shell,.site-header>.shell{gap:12px}
  .nav-links a{padding-inline:7px;font-size:13px;gap:4px}
  .nav-tools{gap:4px}
}
@media(max-width:1100px){
  .desktop-nav{display:none}
  .nav-tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
  html.nav-open .nav-drawer,html.nav-open .nav-veil{display:block}
}
@media(max-width:900px){
  .grid-five{grid-template-columns:repeat(3,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-grid>:first-child{grid-column:1/-1}
}
@media(max-width:768px){
  :root{--gutter:16px;--size-display:40px;--size-h2:28px;--space-10:48px}
  .header-bar>.shell,.site-header>.shell{gap:12px}
  .grid-three{grid-template-columns:1fr}
  .cta-row{flex-wrap:wrap}
  .section-head p{font-size:17px}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,.fc-note{transform:none}
  .dotted,.top,.hero{max-width:100%;overflow-x:clip}
  .brand{font-size:17px;gap:6px}
  .brand img{width:24px;height:24px}
  .nav-tools{gap:4px}
  .lang{font-size:12px;padding-inline:5px;gap:4px}
  .btn-login{font-size:13px;padding-inline:10px;min-height:36px}
  .btn-login .kbd{display:none}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .grid-five{grid-template-columns:1fr}
  .section-head{margin-bottom:24px}
}
@media(max-width:359px){
  .lang svg{display:none}
  .brand{font-size:16px}
  .header-bar>.shell,.site-header>.shell{gap:6px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}