:root{
  --bg:#F1EADC;--bg-top:#F6F1E7;--bg-bottom:#EEE6D6;
  --panel:#E7DDCB;--panel-2:#FBF7EF;--border:#D6CAB5;--border-strong:#BFB09A;
  --accent:#A4542A;--accent-dark:#7A3B1B;--text:#221A13;--text-muted:#6B5E50;--ink-hover:#3A2D22;
  --success:#4F7A3A;--warn:#B9822A;--error:#A8322B;
  --board:#1F1913;--board-top:#241D16;--board-glow:#2A221A;--board-glow-0:rgba(42,34,26,0);
  --paper:#F1EADC;--paper-94:rgba(246,241,231,.94);--paper-80:rgba(241,234,220,.8);
  --paper-60:rgba(251,247,239,.6);--paper-28:rgba(241,234,220,.28);--paper-14:rgba(241,234,220,.14);
  --paper-08:rgba(241,234,220,.08);--paper-05:rgba(241,234,220,.05);
  --c-sage:#7C8B5E;--c-mist:#6F8AA6;--c-ochre:#C9A24A;--c-plum:#7A5566;--c-clay:#B9876A;
  --flag-red:#B63A2F;--flag-blue:#2F4675;--flag-white:#FBF7EF;--flag-green:#3D7347;--flag-edge:rgba(34,26,19,.22);
  --halo:rgba(164,84,42,.07);--halo-0:rgba(164,84,42,0);
  --shadow-ochre:rgba(164,84,42,.10);--shadow-ochre-strong:rgba(164,84,42,.20);
  --shadow-ink:rgba(8,6,3,.55);--shadow-ink-soft:rgba(8,6,3,.32);
  --hl-top:rgba(255,251,243,.55);--ink-hl:rgba(255,251,243,.14);
  --sheen:rgba(255,251,243,.16);--sheen-0:rgba(255,251,243,0);--shade:rgba(24,16,9,.16);
  --edge-soft:rgba(255,251,243,.10);--chip-shade:rgba(24,16,9,.28);--ht-ink:rgba(34,26,19,.30);
  --grain-ink:#1C140D;--grain-paper:#FBF7EF;--veil:rgba(34,26,19,.4);
  --r-zero:0;--r-hair:1px;--r-xs:2px;--r-sm:6px;--r-control:8px;--r-md:10px;--r-lg:12px;--r-xl:20px;--r-pill:999px;
  --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,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --font-serif:Georgia,"Noto Serif SC","Source Han Serif SC","Songti SC","STSong","SimSun",serif;
  --size-tiny:10px;--size-label:12px;--size-trust:13px;--size-small:14px;--size-nav:15px;--size-body:16px;
  --size-brand:19px;--size-h1:66px;--size-h2:36px;--size-h3:24px;--size-lede:22px;
  --weight-body:400;--weight-label:500;--weight-control:600;--weight-bold:700;--weight-display:800;
  --tracking-display:-.03em;--tracking-cjk:-.02em;--tracking-label:.08em;
  --gutter:64px;--wrap-max:1440px;--header-height:68px;--anchor-space:84px;--toc-offset:16px;--toc-landing:100px;
  --duration-fast:.2s;--duration-reveal:.35s;
  --card-shadow:inset 0 1px 0 var(--hl-top),0 24px 48px -26px var(--shadow-ochre);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-space);scroll-behavior:smooth}
body{margin:0;min-height:100vh;font-family:var(--font-body);font-size:var(--size-body);font-weight:var(--weight-body);line-height:1.6;color:var(--text);background-color:var(--bg);background-image:linear-gradient(180deg,var(--bg-top) 0%,var(--bg) 52%,var(--bg-bottom) 100%);-webkit-font-smoothing:antialiased}
a{color:inherit;text-underline-offset:3px}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button,select{min-height:24px}
img,svg,video{max-width:100%;vertical-align:middle}
img{height:auto}
svg{flex-shrink:0}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-xs)}
::selection{background:var(--panel);color:var(--text)}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--text);overflow-wrap:break-word}
h1{margin:20px 0 0;font-weight:var(--weight-display);font-size:var(--size-h1);line-height:1.1;letter-spacing:var(--tracking-display);text-wrap:balance}
:lang(zh-CN) h1,:lang(zh-TW) h1,:lang(ja) h1,:lang(ko) h1{letter-spacing:var(--tracking-cjk)}
h2{margin:0 0 24px;font-weight:var(--weight-bold);font-size:var(--size-h2);line-height:1.25;letter-spacing:var(--tracking-cjk);text-wrap:balance}
h3{margin:0 0 16px;font-size:var(--size-h3);line-height:1.35;font-weight:var(--weight-bold)}
p{margin:0 0 20px}
ul,ol{padding-inline-start:24px}
li{overflow-wrap:break-word}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:24px;border-radius:var(--r-sm);background:var(--board);color:var(--paper);font-family:var(--font-mono)}
pre code{white-space:pre;overflow-wrap:normal}
hr{border:0;border-top:1px solid var(--border);margin:32px 0}
.wrap{width:100%;max-width:var(--wrap-max);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:80px;padding-bottom:80px}
.grid-three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid-five{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:16px}
.grid-three>*,.grid-five>*,.hero-grid>*,.footer-grid>*,.features-layout>*{min-width:0}
.no-break{white-space:nowrap}
.muted{color:var(--text-muted)}
.serif{font-family:var(--font-serif)}
.mono{font-family:var(--font-mono)}
.defs{position:absolute;width:0;height:0;overflow:hidden}
.sr-only{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.panel,.card{padding:32px;border-radius:var(--r-lg);background:var(--panel);box-shadow:var(--card-shadow)}
.panel-light{background:var(--panel-2)}
.badge,.tag{display:inline-flex;align-items:center;min-height:28px;padding:4px 10px;max-width:100%;border-radius:var(--r-sm);background:var(--panel-2);color:var(--text);font:var(--weight-label) var(--size-label)/1.4 var(--font-mono);overflow-wrap:anywhere}
.badge-success{color:var(--success)}
.badge-warn{color:var(--warn)}
.badge-error{color:var(--error)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;padding:12px 22px;border:0;border-radius:var(--r-md);font:var(--weight-control) var(--size-body)/1.4 var(--font-body);text-decoration:none;flex-shrink:0;white-space:nowrap;transition:background-color var(--duration-fast),color var(--duration-fast),border-color var(--duration-fast)}
.btn .arr{width:16px;height:16px;flex:none;transition:transform var(--duration-fast)}
.btn:hover .arr{transform:translateX(2px)}
.btn-ink,.btn-primary{background:var(--text);color:var(--panel-2);box-shadow:0 14px 26px -14px var(--shadow-ochre-strong),inset 0 1px 0 var(--ink-hl)}
.btn-ink:hover,.btn-primary:hover{background:var(--ink-hover)}
.btn-line,.btn-secondary{border:1px solid var(--text);background:var(--sheen-0);color:var(--text)}
.btn-line:hover,.btn-secondary:hover{background:var(--panel)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.55;cursor:not-allowed}
.btn:active{transform:translateY(1px)}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.topbar{position:relative;z-index:100}
.topbar-in{display:flex;align-items:center;gap:28px;height:var(--header-height);flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;margin-right:auto;text-decoration:none;color:var(--text);flex-shrink:0}
.brand-mark{width:30px;height:30px;flex:none}
.brand-word{font:var(--weight-display) var(--size-brand)/1 var(--font-display);letter-spacing:.04em}
.brand-zh{font-weight:var(--weight-label);color:var(--text-muted)}
.nav{flex:1;min-width:0}
.nav-list{display:flex;align-items:center;list-style:none;margin:0;padding:0;font:var(--weight-label) var(--size-nav)/1 var(--font-body);white-space:nowrap;justify-content:flex-end}
.nav-list li+li::before{content:"/";margin:0 12px;color:var(--border-strong);font-weight:var(--weight-body)}
.nav-list a{display:inline-flex;align-items:center;min-height:32px;color:var(--text-muted);text-decoration:none;transition:color var(--duration-fast)}
.nav-list a:hover{color:var(--text)}
.nav-list a[aria-current="page"]{color:var(--text);font-weight:var(--weight-control)}
.nav-tools{display:flex;align-items:center;gap:14px;padding-left:22px;border-left:1px solid var(--border);flex-shrink:0}
.lang-picker{position:relative}
.lang{appearance:none;border:0;background:none;padding:8px 2px;min-height:38px;min-width:44px;width:auto;font:var(--weight-label) var(--size-small)/1.3 var(--font-body);color:var(--text-muted);cursor:pointer;white-space:nowrap}
.lang:hover{color:var(--text)}
.lang-panel{position:absolute;right:0;top:calc(100% + 10px);z-index:130;width:180px;padding:8px;background:var(--panel-2);border-radius:var(--r-control);box-shadow:0 16px 40px var(--shadow-ochre-strong)}
.lang-panel a{display:flex;align-items:center;width:100%;min-height:44px;padding:10px 12px;border-radius:var(--r-sm);text-decoration:none}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;height:38px;min-width:44px;padding:0 18px;border-radius:var(--r-control);background:var(--text);color:var(--panel-2);font:var(--weight-control) var(--size-small)/1 var(--font-body);text-decoration:none;box-shadow:inset 0 1px 0 var(--ink-hl);transition:background-color var(--duration-fast)}
.btn-login:hover{background:var(--ink-hover)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:10px;border:0;background:var(--sheen-0);color:var(--text);border-radius:var(--r-sm)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-hair)}
.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:95;background:var(--panel-2);padding:20px var(--gutter) 40px}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 4px;text-decoration:none;border-bottom:1px solid var(--border)}
.mobile-drawer a[aria-current]{font-weight:var(--weight-bold)}
.drawer-languages{margin-top:24px;border-top:1px solid var(--border)}
.nav-veil{position:fixed;inset:var(--header-height) 0 0;z-index:90;background:var(--veil);border:0;width:100%;padding:0}
html.nav-open{overflow:hidden}
.site-footer{margin-top:40px;padding-top:64px;padding-bottom:32px;background:var(--board);color:var(--paper-80)}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px}
.site-footer .brand{color:var(--paper)}
.footer-description{max-width:350px;margin-top:20px;font-family:var(--font-serif)}
.footer-title{margin:0 0 16px;color:var(--paper);font:var(--weight-label) var(--size-label)/1.4 var(--font-mono);letter-spacing:var(--tracking-label);text-transform:uppercase}
.footer-links{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:4px 20px}
.footer-links li{flex:0 1 auto}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:32px;text-decoration:none}
.site-footer a:hover{text-decoration:underline}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:40px;padding-top:24px;border-top:1px solid var(--paper-28)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;margin-top:24px;font-size:var(--size-small)}
.footer-bottom p{margin:0}
.footer-legal{display:flex;flex-wrap:wrap;gap:8px 20px}
.reveal{transition:opacity var(--duration-reveal) ease,transform var(--duration-reveal) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:static;display:flow-root;width:100%;max-width:100%;min-width:0;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status+*{margin-top:32px}
.prose{max-width:800px;margin-inline:auto;overflow-wrap:break-word}
.prose h2{margin-top:56px}
.prose h3{margin-top:32px}
.prose p,.prose li{line-height:1.85}
.prose img{border-radius:var(--r-sm)}
.decoration-host,.hero{position:relative;overflow-x:clip;max-width:100%}
@media(max-width:1280px){
  .topbar-in{gap:20px}
  .nav-list{font-size:var(--size-small)}
  .nav-list li+li::before{margin:0 8px}
  .nav-tools{gap:10px;padding-left:16px}
}
@media(max-width:1180px){
  :root{--size-h1:58px;--size-lede:20px}
}
@media(max-width:1100px){
  .nav{display:none}
  .nav-tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .topbar-in{gap:16px}
}
@media(min-width:1101px){
  .mobile-drawer,.nav-veil{display:none!important}
  html.nav-open{overflow:auto}
}
@media(max-width:960px){
  :root{--gutter:32px}
  .footer-grid{gap:32px}
  .grid-five{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media(max-width:768px){
  :root{--gutter:20px;--size-h1:38px;--size-h2:30px;--size-lede:19px}
  h1{line-height:1.14}
  .section{padding-top:56px;padding-bottom:56px}
  .grid-three{grid-template-columns:1fr}
  .grid-five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr}
  .nav-tools{margin-left:auto}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,.tilt-card{transform:none}
  .decoration-host,.hero{max-width:100%}
  .topbar-in{gap:8px}
  .brand{gap:6px}
  .brand-mark{width:26px;height:26px}
  .brand-word{font-size:var(--size-body)}
  .nav-tools{gap:6px;padding-left:8px;margin-left:auto}
  .lang{font-size:var(--size-label)}
  .btn-login{padding-inline:12px}
  .panel,.card{padding:24px}
}
@media(max-width:359px){
  :root{--gutter:16px}
  .nav-tools{gap:2px;padding-left:4px}
  .brand-word{font-size:var(--size-small)}
  .brand-mark{width:24px;height:24px}
  .btn-login{padding-inline:10px}
  .lang{font-size:var(--size-tiny)}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}